CN1881202A - Simulation system and simulation method for high voltage AC and DC power transmission training - Google Patents

Abstract

A high-voltage AC/DC transmission training simulation system, the simulation server includes a component simulation module, a control and protection simulation subsystem, a real-time database, an information processing subsystem, and at least one training workstation. The workstation sends training operation command information to the simulation server; the information processing simulation subsystem processes the training operation command information and sends it to the control and protection simulation subsystem, and stores it in the real-time database; the extreme control and station of the control and protection simulation subsystem The control and DC system protection simulation module converts the processed training operation command information into pole control, station control, and DC system protection commands and parameters, and sends them to the component simulation module respectively; the component simulation module converts the component status, simulation data The information is uploaded to the extreme control, station control and DC system protection simulation modules; the information processing subsystem processes the extreme control, station control and DC system protection state quantities, simulation data information and sends them to the real-time database for storage and returns to the training workstation for display.

Description

A high-voltage AC-DC transmission training simulation system and its simulation method

technical field

The invention belongs to the technical field of electric power simulation system. Specifically, it is a simulation method for a high-voltage AC-DC transmission training simulation system. Using computer network technology, without affecting the monitoring system of the DC transmission converter station, the simulation establishes an environment that is consistent with the actual operating system, and conducts training for operating personnel. For training, this system provides a plan to build a training simulator without programming, and at the same time, it uses multimedia technology to simulate the primary equipment on site, making the training effect more realistic.

Background technique

With the increase in the scale of electric power development, new prospects for the development of HVDC transmission have emerged. Due to the increase in the complexity of HVDC transmission technology, there are also higher requirements for the control system of operators. If operators cannot fully grasp them, it will seriously affect The safe and stable operation of the DC transmission system, therefore, it is absolutely necessary to establish a simulation training system that can fully meet the operating requirements of the HVDC transmission system.

Please refer to Figure 1 for a system diagram of the technology. The prior art online simulation training system is composed of a simulation server and a training workstation, which are connected together with an operator control system through a firewall. The communication between the server and the workstation, as well as the communication between the server and the real-time operation system adopts TCP/IP protocol.

The current simulation training system is developing rapidly at home and abroad, but most of the training simulation systems and real-time systems are not integrated enough. The training simulation system and the operator control system cannot share a set of pictures and data. Even if the system is well developed , users will feel inconvenient in the process of use and maintenance and discard it; moreover, the multimedia functions in most training simulation systems have not been applied, and the simulation effect is not realistic enough; more importantly, the power consumption of most training simulation systems is The models are all AC system models, which cannot meet the growing situation of the DC transmission system market.

Contents of the invention

In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a simulation method for a high-voltage AC-DC transmission training simulation system, establish a hybrid simulation of the AC system and the DC system, and meet the needs of the DC transmission system.

Another object of the present invention is to provide a simulation method for a high-voltage AC/DC transmission training simulation system, which integrates training and monitoring without mutual influence, and improves the simulation effect.

In order to accomplish the above object, the overall technical solution adopted by the present invention is: a high-voltage AC-DC power transmission training simulation system, including a simulation server and a workstation connected by Ethernet, the workstation includes a training workstation and a monitoring workstation, and the simulation server includes:

Component simulation module, connected to the control and protection simulation subsystem, used for AC and DC simulation of electrical equipment;

The control and protection simulation subsystem includes the extreme control system simulation module, the station control system simulation module and the DC system protection simulation module. The three modules are interconnected and connected to the information processing subsystem respectively for the simulation of control and protection functions ;

The real-time database is connected to the data processing subsystem, and is used for storing the training operation command information processed by the information processing subsystem issued by the training workstation and the state quantity and simulation data information processed by the information processing subsystem returned by the component simulation module;

The information processing subsystem is connected to the control and protection simulation subsystem and the database, and is connected to the training workstation and the monitoring system workstation through Ethernet for real-time access to the database data, and realizes data between the modules of the control and protection function simulation subsystem. Exchange, read the real-time system operation status, and process the commands given by the training workstation;

The training workstation is at least one, connected to the information processing subsystem through Ethernet, used to send training operation command information to the simulation server and receive various information sent by the simulation server, perform operation training, and connect to the real-time power transmission system, Receive the running data sent by the real-time system,

A simulation method for a high-voltage AC-DC transmission training simulation system, comprising the following steps:

Step 1, the training workstation sends training operation command information to the simulation server;

Step 2, the information processing simulation subsystem of the simulation server processes the training operation command information sent by the training workstation, and sends it to the control and protection simulation subsystem of the simulation server, and stores it in the real-time database at the same time;

Step 3. The pole control system simulation module, station control system simulation module and DC system protection simulation module of the control and protection simulation subsystem convert the processed training operation command information into pole control, station control, and DC system protection instructions and parameters, And send it to the component simulation module respectively;

Step 4, the component simulation module uploads information such as the state quantity and simulation data of the component to the pole control system simulation module, the station control system simulation module and the DC system protection simulation module of the control and protection simulation subsystem;

Step 5. The information processing subsystem processes the status quantities and simulation data information of pole control, station control and DC system protection, and sends them to the real-time database for storage, and returns them to the training workstation for display.

The training operation command information in step 1 includes control commands and reference values.

The simulation of the extreme control system simulation module in the step 3 includes constant power control, constant current control, converter tap control, online power flow reversal, stable control, training workstations on steady-state operating values, step values and changes On-line modification of the rate, training workstations to select one or more of the reactive power control manual/automatic modes.

The simulation of the station control system simulation module in step 3 includes switching/closing operation of AC switchgear, switching/closing operation of DC grounding knife switch, sequence control operation of high voltage AC/DC transmission training simulation system, reactive power control, switching Switching/closing of the auxiliary power supply of the flow station and the switchgear above 10 kV, and one or more of the switching control of the cooling system.

The AC switchgear includes a circuit breaker, a disconnector and a grounding switch.

The station control system simulation module in step 3 also returns monitoring information to the workstation, including the execution status of the station control operation command, the operation status of the primary equipment of the converter station, and the station control simulation of the primary system loop and branch operation parameters of the converter station. The simulation sequence of the module is maintenance, cold standby, hot standby, unlocking operation, and no-load pressurization test.

The simulation of the DC system protection simulation module in step 3 includes pole protection, pole control protection, converter transformer protection, and AC filter/parallel capacitor protection.

The pole protection includes short circuit protection, overcurrent protection, bridge differential protection, valve group differential protection, converter valve side AC connection protection, pole protection zone grounding protection, back-to-back differential protection, 50 Hz and 100 Hz protection, One or more of reverse flow protection and external trip command.

The extreme control protection includes one of AC overvoltage protection, AC undervoltage protection, DC overvoltage protection, DC undervoltage protection, commutation failure prediction, thyristor junction temperature monitoring, large angle monitoring, and no-load pressurization test monitoring. species or several.

The converter transformer protection includes converter transformer branch differential protection, converter transformer branch and converter transformer overcurrent protection, converter transformer differential protection, converter transformer overcurrent protection, converter transformer branch and converter transformer One or more of DC transformer differential protection, winding differential protection, zero-sequence current protection, converter transformer over-excitation protection, homodyne protection, thermal overload protection, and converter transformer body protection.

The AC filter/parallel capacitor protection includes differential protection, over-current protection, zero-sequence current protection, filter detuning monitoring, circuit breaker failure protection, high-voltage end capacitor unbalance protection, resistance harmonic overload protection, reactance harmonic One or more of wave overload protection and low voltage capacitor protection

The component simulation module in step 4 is for primary equipment including switchgear, AC filter, shunt capacitor/reactor, converter transformer, converter, smoothing reactance, auxiliary system including valves, and high-voltage direct current Simulation of the electrical characteristics of the connection.

The simulation of the AC network on both sides of the converter station by the component simulation module is represented by a simplified AC variable voltage source with impedance, wherein the impedance is related to the parameter characteristics of the actual AC network.

The component simulation module adopts a standard converter station formula for the simulation of the electrical characteristics of the DC connection.

The component simulation module uses a controllable voltage source to simulate the converter.

The component simulation module also returns monitoring information to the workstation, including the three-phase voltage, three-phase current, active power, reactive power of the AC incoming lines on both sides, the current of each branch of the AC filter, shunt capacitor and reactor, and the operation mode. Setting values of DC current, DC power and its rate of change or step change, DC operating voltage, current and power, reactive power absorbed by the converter valve, reactive power exchanged between the converter station and the AC system, ignition angle or arc extinction Angle and commutation angle, converter winding temperature, converter tap position, switching status of AC filter, shunt capacitor and reactor, switching status of circuit breaker, disconnector and grounding switch, sequence event record One or more of the signals.

The advantages and beneficial effects of the present invention are: the system is composed of two major parts, the training workstation and the simulation server, the simulation configuration function in the simulation server is powerful, easy to use and operate, a graphical user interface is adopted, and a simulation can be configured without programming knowledge System model; and use the client/server mode to establish a program module for obtaining operator control system data, and establish a disk map of the simulation server on the operator data workstation, which can directly send the data in the real-time database of the operator control system to the simulation server at regular intervals , for real-time startup; the training workstation adopts the same screen and data as the operator control system, analyzes, processes, stores and graphically displays the data sent by the simulation server, and provides a man-machine interface; at the same time, it uses multimedia technology to One-time equipment simulation on site can display equipment inspection images, equipment failure images, etc., so that students can adjust and view at will, and enhance perceptual knowledge; the entire simulation system is friendly in interface, easy to operate and use, and can flexibly and conveniently simulate various operations of the DC system operation, and can conveniently set various line, transformer, and bus failures, which is conducive to improving the normal operation level of operators and the ability to deal with abnormal accidents. At the same time, the present invention adopts object-oriented technology to establish an information model of power objects, describes the power objects in the form of objects, and adds object view design on the basis of object structure design such as attributes, operations, events, etc., to realize the visualization of management power objects. Graphics and power objects are tightly bound, object structure design and view design are integrated, and power objects and object data are automatically associated.

Description of drawings

Fig. 1 is a prior art system composition diagram;

Fig. 2 is a system configuration diagram of the present invention;

Fig. 3 is the main flow chart of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

Please refer to Fig. 2, the system configuration diagram of the present invention. The online simulation training system of the present invention is also composed of a simulation server and a training workstation, which are connected together with the operator control system through a firewall. This system is truly cross-platform. Both the simulation server and the training workstation can be selected by the user according to the actual situation such as project budget and system requirements, and the multi-user operating system (UINX) can be selected, and HP (HP alpha machine) or Windows operating system (WINDOWS) can be used. , to cultivate high-performance personal computers (PCs). The communication between the server and the workstation, as well as the communication between the server and the real-time operation system adopts TCP/IP protocol. The high-voltage AC/DC transmission training simulation system of the present invention includes a simulation server and a workstation connected by Ethernet, the workstation includes a training workstation and a monitoring workstation, and the simulation server includes: a component simulation module, a connection control and protection simulation subsystem, used for electrical AC and DC simulation of equipment; control and protection simulation subsystem, including extreme control system simulation module, station control system simulation module and DC system protection simulation module, the three modules are interconnected and connected to the information processing subsystem respectively for Simulation of control and protection functions; real-time database, connected to the data processing subsystem, used to store the training operation command information sent by the training workstation and processed by the information processing subsystem and the status returned by the component simulation module processed by the information processing subsystem Quantity, simulation data information; information processing subsystem, which connects the control and protection simulation subsystem and database, and connects training workstations and monitoring system workstations through Ethernet, for real-time access to database data, in the control and protection function simulation subsystem Realize data exchange between modules, read real-time system operating status quantities, and process commands given by training workstations;

There is at least one training workstation, connected to the information processing subsystem through Ethernet, used to send training operation command information to the simulation server and receive various information sent by the simulation server for operation training, and connected to the real-time power transmission system to receive real-time The operating data transmitted by the system,

The simulation server system of the present invention adopts an object-oriented design structure, realizes the graphical modeling of logic modules such as the primary main wiring system of the power grid, general protection, and secondary circuits, and realizes the simulation of pole control, station control functions, and DC system protection functions , including converter protection, filter protection, shunt capacitor/reactor protection, and DC pole protection. Accurate simulation is realized for pole control, station control and DC protection, and a graphical, modular and interactive modeling environment is provided for users. The whole process of modeling can be completed without memorizing any character commands and without programming. Model editing, modification and debugging can be realized conveniently without compiling process. And can complete the graphic connection of the primary model and the secondary circuit model. It enables users to easily complete the graphical modeling of all grid simulation and converter station simulation models, and it is very convenient to modify, expand and upgrade.

The invention has a graphical debugging tool, which is used to track and debug the files generated by the graphical modeling editing environment, track and debug the secondary modeling principle diagram, so that the power station modeler can intuitively find the problems in the automatic loop and make corrections. Greatly improved work efficiency. After the power network model is established, the simulation system can automatically analyze the network topology. Users can define whether certain primitives or devices participate in network topology analysis, and check the connection relationship according to the device type. In the operating environment, various calculations can be directly performed on the power network: such as dynamic power flow, short-circuit calculation, stability calculation, frequency calculation, etc., constant power control, constant current control or reactive power control, and high-voltage direct current transmission training simulation can be performed on the DC system System (HVDC) sequence control and other operations, at the same time, various fault settings can be performed on the equipment on the graph, the system performs simulation calculations for this, and relevant information is transmitted to the training workstation, so as to conduct simulation training for trainers.

Please refer to the main flow chart of the present invention in Fig. 3, the simulation method of the high-voltage AC-DC transmission training simulation system of the present invention comprises the following steps:

Firstly, the training operation command information is sent from the training workstation to the simulation server; then, the information processing simulation subsystem of the simulation server processes the training operation command information sent by the training workstation, and sends it to the control and protection simulation subsystem of the simulation server, Simultaneously stored in the real-time database; the pole control system simulation module, station control system simulation module and DC system protection simulation module of the control and protection simulation subsystem convert the processed training operation command information into pole control, station control, and DC system protection Instructions and parameters are sent to the component simulation module respectively; the component simulation module uploads the component’s state quantity, simulation data and other information to the control and protection simulation subsystem’s extreme control system simulation module, station control system simulation module and DC system protection Simulation module; finally, the information processing subsystem processes the status quantities and simulation data information of pole control, station control and DC system protection, sends them to the real-time database for storage, and returns them to the training workstation for display.

The simulation system mainly includes the following parts for the simulation of the high-voltage DC connection, pole control system/station control system/DC system protection including the electrical characteristics of the AC switchgear, the connected AC network and the DC line:

1. For the simulation of the component simulation module of electrical equipment, the content includes the electrical characteristics of primary equipment, auxiliary systems, and high-voltage DC connections. The primary equipment includes switchgear, AC filter, shunt capacitor/reactor, converter transformer, converter, smoothing reactor, etc., and the auxiliary system includes valve cooling, etc. The AC network on both sides of the converter station is composed of impedance Simplify the AC variable voltage source representation, in which the impedance is related to the parameter characteristics of the actual AC network, the simulation calculation of the electrical characteristics of the DC link uses the standard converter station formula, and the converter is simulated with a controllable voltage source, etc. Component simulation can also return the following signals for monitoring: three-phase voltage, three-phase current, active power, and reactive power of AC incoming lines on both sides; AC filter, shunt capacitor and reactor branch current; operation mode; DC current , DC power and its rate of change, or the setting value of step change; DC operating voltage, current and power; reactive power absorbed by the converter valve; reactive power exchanged between the converter station and the AC system; ignition angle or arc extinguishing angle , and commutation angle; converter transformer winding temperature; converter transformer tap position; AC filter, shunt capacitor and reactor switching status; circuit breaker, isolating switch and grounding switch switching status; sequence event record (SER) signal; and information on other required signals.

2. For the simulation of control and protection functions, the control and protection simulation subsystem includes the following points for the simulation of control and protection functions:

(1) The simulation of the extreme control system simulation module, which simulates the realization of constant power control, constant current control, converter tap control, online power flow reversal, stable control, etc.; the following functions of the extreme control simulation model: constant power control, constant Current control, switching between constant power and constant current control modes, converter tap control, online power flow reversal, stable control functions, support for online training of fixed values (steady-state operating values, step values and rate of change) by training workstations Modify and support the selection of manual/automatic modes of reactive power control in training workstations.

Under normal working conditions, the rectifier side maintains a constant DC current by quickly adjusting the alpha angle; the inverter side controls the gamma angle.

The slow control strategy of the commutation variable taps matched with the fast control is as follows: under normal working conditions, the alpha angle of the tap control on the rectification side is 15°±2.5°, and the tap control U _di0 on the inverter side is 1±(1.25%) pu .

The valve group control should include a low-voltage current limiting link, which is used to limit the DC current command when the DC voltage decreases.

According to the basic control strategy, valve group control should include the following three basic controllers: closed-loop current regulator, voltage regulator, and modified gamma controller.

Please refer to Figure 4. Different parameters are configured for the rectification and inverter operation in the valve group control, so that in actual operation, different regulators work on the rectification side and the inverter side, so as to achieve the desired Ud/Id characteristic curve

(2) Simulation of the station control system simulation module. The station control simulation module should target the following control functions: cut/close operation of AC switchgear (circuit breaker, disconnector and grounding switch), switch/close operation of DC grounding switch, sequence control operation of HVDC system, reactive power control , Switching/closing of the auxiliary power supply of the converter station and the switchgear above 10KV, switching control of the cooling system.

The station control simulation module can monitor the following functions: the execution status of all the above-mentioned station control operation instructions, the operation status of all the primary equipment in the converter station (such as the opening/closing of AC/DC switches, knife switches, ground knife, and the oil of the converter station). Temperature, winding temperature, tap position, etc.), operating parameters of all primary system circuits and branches of the converter station (such as voltage, current, active/reactive power, etc.), auxiliary systems of the converter station (systems such as valve cooling) Operating status and operating parameters.

In order to carry out relevant training for operating personnel, the station control simulation module should support the realization of simplified sequence control and interlocking functions. For example, in Lingbao converter station, there are five basic states of DC system sequence control: maintenance, cold standby, hot standby, unlocked operation and no-load pressurization test. The five basic states are described as follows: Inspection state: the grounding knife gates of all valve halls are closed, and the valve hall doors can be opened. Cold standby state: the grounding knife switches of all valve halls are in the open state, and the valve hall doors are closed. At this time, the valve cooling system is normal and should be in operation. Hot standby state: the grounding knife switches of all valve halls are in the open state, and the valve hall doors are closed. At this time, there is no abnormality in the valve cooling control system, and the converter has been charged. Operation: On the basis of hot standby, unlock the valve and put it into operation. No-load pressurization test: The no-load pressurization test is different from the control sequence of the DC system commissioning/shutdown process, which is a test state.

The sequence of starting the DC system mainly includes the following steps: 1. Close the valve hall door and lock the valve hall door key in the locked state; 2. Open the valve hall door; 3. Be in the cold standby state; 4. Charge the converter transformer ;5. In hot standby state; 6. The valve is unlocked. It is in the running state of the DC system.

The sequence of the outage DC system mainly includes the following steps: 6. Valve locking; 5. Going to the hot standby state; 4. Discharging the converter transformer; 3. Going to the cold standby state; 2. Close the valve hall knife; 1. Release the valve hall key, allowing to open the valve hall door. At this point, the DC system is out of service. The converter station returns to the inspection state.

The basic functional requirements of the start/stop sequence control are as follows: sequence control is mainly to provide automatic execution functions for the opening/closing operation of a group of electric switches and knife gates in the converter station and the unlocking/locking of the converter valve. Sequence control includes the following functions: 1. Sequence control can be manually started by the operator on the operator workstation or on the main screen of the pole control/station control, and the priority of the two is that the latter is higher than the former; 2. The realization process of sequence control It should be judged whether the interlocking conditions are satisfied; 3. The sequence control has two functions of automatic execution and step-by-step execution. When executing step by step, each step can be executed according to the choice of the operator to decide whether to continue the next step or stop the execution of sequence control; 4. It can provide the mutual conversion function of automatic execution and step-by-step execution, and the number of mutual conversions is not limited. Restricted.

During the execution of sequence control, if the sequence control cannot be carried out due to a certain device, the sequence control operation can be stopped at the device. After the operator manually operates the device, the operator decides whether the sequence operation is to be executed automatically. Or step by step to continue execution or return to the starting point of the sequence operation.

During the execution of the sequence control, the operator can suspend or suspend the execution of the sequence control. In the paused state, the operator can decide whether the sequential operation will continue to be executed in an automatic or step-by-step manner, or return to the starting point of the sequential operation.

For the locking/unlocking of the valve, the control mode or the sequence control of the operation mode conversion, the coordination and cooperation of the automatic sequence between the rectifier side and the inverter side are designed to be realized in the DC pole control system.

There is a function designed in the sequence control program to prevent a command to change the state from being issued incorrectly when a system failure occurs, such as when the auxiliary power supply is lost instantaneously.

(3) Simulation of DC system protection simulation module. The DC system protection simulation module simulates the action behavior of the following protections:

pole protection, including short circuit protection (220kV side, 330kV side), overcurrent protection (220kV side, 330kV side), bridge differential protection (220kV side, 330kV side), valve group differential protection (220kV side, 330kV side), Rheological valve side AC connection protection (220kV side, 330kV side), pole protection zone grounding protection, back-to-back differential protection, 50Hz and 100Hz protection, power flow reversal protection, external trip command.

Pole control protection, including AC overvoltage protection (220kV side, 330kV side), AC undervoltage protection (220kV side, 330kV side), DC overvoltage protection, DC undervoltage protection, commutation failure prediction (220kV side, 330kV side ), thyristor junction temperature monitoring (220kV, 330kV side), large angle monitoring (220kV side and 330kV side), no-load pressure test monitoring (220kV side and 330kV side)

Converter transformer protection, including converter transformer branch differential protection, converter transformer branch and converter transformer overcurrent protection, converter transformer differential protection, converter transformer overcurrent protection, converter transformer branch and converter transformer Transformer differential protection, winding differential protection, zero-sequence current protection, converter transformer over-excitation protection, homodyne protection, thermal overload protection, converter transformer body protection

AC filter/shunt capacitor (reactor) protection. Including differential protection, over-current protection, zero-sequence current protection, filter detuning monitoring, circuit breaker failure protection, high-voltage side capacitor unbalance protection, resistor harmonic overload protection, reactance harmonic overload protection, low-voltage capacitor protection ( HP3 high pass filter)

3. Real-time database system, real-time database of the present invention adopts novel real-time data interface, does not have the support of state estimation program, and under the limited situation of external network operating personnel control system measurement, emulation system has studied novel real-time data interface, adopts prediction- The correction-control method realizes the real-time start-up of the data from the operating personnel control system, which not only ensures the real-time performance of the data in the joint operation network, but also simulates the dynamic characteristics of the entire DC system power grid. The real-time data is saved at regular intervals, so that the trainers can view the running status reports, curves and events, etc. conveniently.

4. Information Processing Subsystem (IPS): IPS realizes access to database data, data exchange between extreme control/station control/protection simulation models, reading of real-time operating system state quantities, and training workstations Handling of commands etc. is given.

The input command (reference value, control command) issued by the training workstation is sent to the extreme control/station control/protection simulation module of the simulation training device after being processed by the information processing subsystem (IPS) through the TCP/IP connection of the local area network, and is also sent to the real-time database for storage. The simulation model processes these input commands, and sends related commands or parameters (switching, cutting capacitors/reactors, firing angles, etc.) to the component simulation module. The component simulation module uploads information such as state quantities and simulation data to the extreme control/station control/protection simulation module, and they process the relevant information through IPS and send it to the real-time database for storage, and return it to the training workstation for display. The simulation module has a sequential event recording (SER) function. At the same time, there is a graphical user interface in the information processing subsystem, which can configure the simulation system model (including parameters), and establish various simulation models that meet the needs. After the simulation model is built, the program generator converts the model into a The real-time simulation program runs in the background of the simulation server.

The working interface of the training workstation of this system is exactly the same as that of the operating personnel workstation. The system status data can be obtained from the simulation server or from the real-time operating system, but all the operation commands issued by the trainer workstation will not have any impact on the operating personnel control system and effect. The training workstation adopts a hierarchical distributed structure design, adopts object-oriented technology to establish an information model of power objects according to the IEC-61970 standard, and describes power objects in the form of objects. On the basis of object structure design such as attributes, operations, events, etc., add Object view design to realize the visualization of management power objects. Graphics and power objects are tightly bound, object structure design and view design are integrated, and power objects and object data are automatically associated.

In order to enhance the effect of simulation training, the training workstation adopts multimedia technology, which integrates graphics, images, sounds and texts, and reproduces the operation process and running conditions of the on-site equipment, as well as the situation when the accident occurs, so that the trainers are more impressed. Make the simulation effect more realistic.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (18)

1. A high-voltage AC-DC power transmission training simulation system, including a simulation server and a workstation connected by Ethernet, and the workstation includes a training workstation and a monitoring workstation, characterized in that, The simulation server includes: Component simulation module, connected to the control and protection simulation subsystem, used for AC and DC simulation of electrical equipment; The control and protection simulation subsystem includes the extreme control system simulation module, the station control system simulation module and the DC system protection simulation module. The three modules are interconnected and connected to the information processing subsystem respectively for the simulation of control and protection functions ; The real-time database is connected to the data processing subsystem, and is used for storing the training operation command information processed by the information processing subsystem issued by the training workstation and the state quantity and simulation data information processed by the information processing subsystem returned by the component simulation module; The information processing subsystem is connected to the control and protection simulation subsystem and the database, and is connected to the training workstation and the monitoring system workstation through Ethernet for real-time access to the database data, and realizes data between the modules of the control and protection function simulation subsystem. Exchange, read the real-time system operation status, and process the commands given by the training workstation; The training workstation is at least one, connected to the information processing subsystem through Ethernet, used to send training operation command information to the simulation server and receive various information sent by the simulation server, perform operation training, and connect to the real-time power transmission system, Receive the running data sent by the real-time system. 2. A simulation method for a high-voltage AC-DC transmission training simulation system, characterized in that the method comprises the following steps: Step 1, the training workstation sends training operation command information to the simulation server; Step 2, the information processing simulation subsystem of the simulation server processes the training operation command information sent by the training workstation, and sends it to the control and protection simulation subsystem of the simulation server, and stores it in the real-time database at the same time; Step 3. The pole control system simulation module, station control system simulation module and DC system protection simulation module of the control and protection simulation subsystem convert the processed training operation command information into pole control, station control, and DC system protection instructions and parameters, And send it to the component simulation module respectively; Step 4, the component simulation module uploads information such as the state quantity and simulation data of the component to the pole control system simulation module, the station control system simulation module and the DC system protection simulation module of the control and protection simulation subsystem; Step 5. The information processing subsystem processes the status quantities and simulation data information of pole control, station control and DC system protection, and sends them to the real-time database for storage, and returns them to the training workstation for display. 3. The simulation method of the high-voltage AC/DC transmission training simulation system according to claim 2, wherein the training operation command information includes control commands and reference values. 4. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, characterized in that the simulation of the extreme control system simulation module in the step 3 includes constant power control, constant current control, commutation variation Joint control, online power flow reversal, stable control, online modification of steady-state operating value, step value and change rate by training workstation, and one or more of the selection of manual/automatic modes for reactive power control by training workstation. 5. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, characterized in that, the simulation of the station control system simulation module in the step 3 includes switching/closing operations of AC switchgear, DC grounding knife Switching/closing operation, sequence control operation of high-voltage AC/DC transmission training simulation system, reactive power control, switching/closing of auxiliary power supply of converter station and switchgear above 10 kV, switching control of cooling system or several. 6. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 5, wherein the AC switchgear includes a circuit breaker, a disconnector and a grounding switch. 7. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, characterized in that, the station control system simulation module in the step 3 also returns monitoring information to the workstation, including the execution status of the station control operation command, One or more of the operating status of the primary equipment of the converter station, the operating parameters of the primary system circuit and branch of the converter station, the operating status and operating parameters of the auxiliary system of the converter station, etc. 8. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, wherein the simulation sequence of the station control simulation module is maintenance, cold standby, hot standby, unlocking operation, and no-load pressurization test. 9. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, wherein the simulation of the DC system protection simulation module in the step 3 includes pole protection, pole control protection, converter transformer protection, AC filter/shunt capacitor protection. 10. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 9, wherein the pole protection includes short-circuit protection, over-current protection, bridge differential protection, valve group differential protection, and converter valve One or more of side AC connection protection, pole protection zone grounding protection, back-to-back differential protection, 50 Hz and 100 Hz protection, reverse flow protection and external tripping order. 11. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 9, wherein the extreme control protection includes AC overvoltage protection, AC undervoltage protection, DC overvoltage protection, DC undervoltage protection, One or more of commutation failure prediction, thyristor junction temperature monitoring, large-angle monitoring, and no-load pressurization test monitoring. 12. The simulation method of the high-voltage AC/DC transmission training simulation system according to claim 9, wherein the converter transformer protection includes differential protection of the converter transformer branch, converter transformer branch and converter transformer overvoltage protection. Current protection, converter transformer differential protection, converter transformer over-current protection, converter transformer branch and converter transformer differential protection, winding differential protection, zero-sequence current protection, converter transformer over-excitation protection, homodyne protection , Thermal overload protection, one or more of converter transformer body protection. 13. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 9, wherein the AC filter/parallel capacitor protection includes differential protection, over-current protection, zero-sequence current protection, and filter failure protection. One or more of harmonic monitoring, circuit breaker failure protection, high-voltage capacitor unbalance protection, resistance harmonic overload protection, reactance harmonic overload protection, and low-voltage capacitor protection. 14. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, characterized in that, the component simulation module in the step 4 is to include switchgear, AC filter, shunt capacitor/reactor, inverter Primary equipment consisting of rheology, converters, and smoothing reactance, including auxiliary systems for valves, and simulation of electrical characteristics of high-voltage DC connections. 15. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 14, characterized in that, the simulation of the AC network on both sides of the converter station by the component simulation module is performed by a simplified AC variable voltage source with impedance Representation, where the impedance is related to the parametric properties of the actual AC network. 16. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 14, wherein the component simulation module uses standard converter station formulas for simulating the electrical characteristics of the DC connection. 17. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 14, wherein the component simulation module uses a controllable voltage source to simulate the converter. 18. The simulation method of the high-voltage AC-DC transmission training simulation system according to claim 2, wherein the component simulation module also returns monitoring information to the workstation, including the three-phase voltage and three-phase current of the AC incoming lines on both sides , Active power, reactive power, AC filter, shunt capacitor and reactor branch current, operation mode, DC current, DC power and its rate of change or setting value of step change, DC operating voltage, current and power, The reactive power absorbed by the converter valve, the reactive power exchanged between the converter station and the AC system, the ignition angle or arc extinguishing angle and the commutation angle, the temperature of the converter transformer winding, the position of the converter transformer tap, AC filter, shunt capacitor and Reactor switching status, switching status of line circuit breaker, isolating switch and grounding switch, one or more of sequential event recording signals.

Images