CN110514953B - Simulation identification method and system of power grid fault based on power angle and voltage aliasing - Google Patents
Simulation identification method and system of power grid fault based on power angle and voltage aliasing Download PDFInfo
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- CN110514953B CN110514953B CN201910226054.2A CN201910226054A CN110514953B CN 110514953 B CN110514953 B CN 110514953B CN 201910226054 A CN201910226054 A CN 201910226054A CN 110514953 B CN110514953 B CN 110514953B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention discloses a power angle and voltage aliasing based power grid fault simulation identification method and system, which comprise the following steps: carrying out fault scanning on the power grid, and determining that the power angle and voltage instability aliasing fault occurs in the power grid; judging whether the power grid has a first fault or not, or judging whether the power grid has a second fault or not; and if the first fault occurs to the power grid, determining that the power grid fault is a voltage instability fault. And if the second fault occurs in the power grid, determining that the power grid fault is a power oscillation fault. The simulation identification method for intelligently and comprehensively evaluating the power angle fault and the voltage instability aliasing fault in the power grid is explained from the mechanism angle.
Description
Technical Field
The invention belongs to the technical field of electrical simulation identification, and particularly relates to a power angle and voltage aliasing based power grid fault simulation identification method and system.
Background
With the increase of non-traditional loads (motor loads), the relative lag of the construction of a main network grid of a power grid, the historical cause of a generator access system, the high density and decentralized access of novel power generation equipment (fans, photovoltaics, electric vehicles and energy storage devices) to the power grid, the complexity of the form of the formed power grid increases year by year, the analysis of the formed power grid is more and more complex, the aliasing type problems of voltage stability and power angle stability frequently occur and show the trend of increasing gradually, the aliasing type problems occur in industrial calculation, and the method is one of the key points concerned in recent years. Under the background, the single power angle stability theory and the single voltage stability theory directly and correspondingly explain the analysis mode of a transient stability process of a certain formed power grid can not meet the requirements of power grid operation control analysis and construction development analysis, and the difficulty of analyzing a cause analysis evidence chain with a complete and clear structure is more and more difficult.
Along with the current aliasing problems caused by large-machine and small-network caused by the integration of large-voltage and small-network on the AC set of the power grid and the open loop of the power grid, the aliasing analysis methods in the ultra-large-scale AC power grid are less, but can be divided into two types:
on one hand, a method for calculating an actual parameterization mechanism of an analytic expression; under the condition of few parameters, the analysis can be very accurate; however, in a large power system having thousands or tens of thousands of elements, the number of parameters is often too large, and the participation amount of the performance characteristics is often a cluster characteristic or a load group characteristic. The search process from "appearance aliasing-type instability features" to "identify single crew" is likely to be an astronomical order of magnitude of effort.
On the other hand, aiming at the intelligent comprehensive evaluation method without analytic solution expression: the effect is obvious in some local areas, but the popularization aspect also faces the dilemma of 'lack of mechanism explanation' because the explanation is not from the mechanism perspective.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first purpose of the invention is to provide a power angle and voltage aliasing-based power grid fault simulation identification method.
The invention aims to provide a power angle and voltage aliasing-based power grid fault simulation identification system.
In order to achieve the above object, a simulation identification method for a power grid fault based on power angle and voltage aliasing provided by an embodiment of the first aspect of the present invention includes:
s1: and carrying out fault scanning on the power grid, and determining that the power angle and voltage instability aliasing fault occurs in the power grid.
S2: and judging whether the power grid has a first fault or not, or whether the power grid has a second fault or not.
S21: and if the first fault occurs to the power grid, determining that the power grid fault is a voltage instability fault.
S22: and if the second fault occurs in the power grid, determining that the power grid fault is a power oscillation fault.
According to an embodiment of the present invention, the determining that the grid fault is a voltage instability fault includes:
s31: and setting a first time, and terminating the event of the power grid where the first fault is located in the first time.
S31: and judging whether the voltage instability fault of the power grid is eliminated, and if the voltage instability fault of the power grid is eliminated, judging that the reason of the voltage instability of the power grid is that the dynamic reactive power of the power grid is insufficient.
S32: and if the grid voltage instability fault is not eliminated, judging that the grid fault is a power angle and voltage aliasing fault, searching for a power angle flying out of the unit, setting a second time, setting non-short-circuit tripping of a grid line where the fault is located in the second time, and cutting off the unit.
According to an embodiment of the present invention, the determining that the grid fault is a voltage instability fault further includes:
s41: and continuously judging whether the grid voltage instability fault is eliminated, and if the grid voltage instability fault is eliminated, judging that the grid voltage instability reason is caused by the removal of the grid excitation system.
S44: and if the grid voltage instability fault is not eliminated, determining that the reason of the grid voltage instability is power angle oscillation.
According to an embodiment of the present invention, the determining that the grid fault is a power oscillation fault includes:
s51: and calculating the center coordinate of the power angle oscillation of the power grid and calculating the voltage instability coordinate of the power grid.
S52: and analyzing the fluctuation condition of the voltage amplitude of each bus from the center coordinate to the power loss area, and determining the electrical distance coordinate of the bus voltage from the oscillation center coordinate according to the voltage amplitude fluctuation rate of the bus.
S53: and calculating the power angle instability probability of the power grid according to the electrical distance coordinate of the bus voltage from the oscillation center coordinate of the power grid and the voltage instability coordinate of the power grid.
According to one embodiment of the invention, the first fault is a short circuit disconnection trip fault and the second fault is a direct loss of power fault.
The simulation identification system for the power grid fault based on the power angle and the voltage aliasing provided by the embodiment of the second aspect of the invention comprises the following components:
and the determining module is used for scanning the fault of the power grid and determining the power angle and voltage instability aliasing fault of the power grid.
And the judging module is used for judging whether the power grid has a first fault or not, or whether the power grid has a second fault or not.
And the first determining module is used for determining that the power grid fault is a voltage instability fault if the first fault occurs in the power grid.
And the second determining module is used for determining that the power grid fault is a power oscillation fault if the second fault occurs in the power grid.
According to an embodiment of the invention, the first determining module comprises:
and the setting unit is used for setting a first time and terminating the event of the power grid where the first fault is located in the first time.
The first detection unit is used for judging whether the voltage instability fault of the power grid is eliminated or not, and if the voltage instability fault of the power grid is eliminated, judging that the reason of the voltage instability of the power grid is that the dynamic reactive power of the power grid is insufficient.
And if the grid voltage instability fault is not eliminated, the second detection unit judges that the grid fault is a power angle and voltage aliasing fault, searches for a power angle flying-out unit, sets a second time, sets non-short-circuit tripping of a grid line where the fault is located in the second time, and cuts off the unit.
According to an embodiment of the present invention, the first determining module further includes:
and the third detection unit is used for continuously judging whether the grid voltage instability fault is eliminated or not, and if the grid voltage instability fault is eliminated, judging that the grid voltage instability reason is caused by the removal of the grid excitation system.
And if the grid voltage instability fault is not eliminated, the fourth detection unit judges that the reason of the grid voltage instability is power angle oscillation.
According to an embodiment of the invention, the second determining module comprises:
and the first calculation unit is used for calculating the center coordinate of the power angle oscillation of the power grid and calculating the voltage instability coordinate of the power grid.
And the second calculation unit is used for analyzing the fluctuation condition of the voltage amplitude of each bus from the center coordinate to the power loss area and determining the electrical distance coordinate of the bus voltage from the oscillation center coordinate according to the voltage amplitude fluctuation rate of the bus.
And the third calculation unit is used for calculating the power angle instability probability of the power grid according to the electrical distance coordinate of the bus voltage from the oscillation center coordinate of the power grid and the voltage instability coordinate of the power grid.
According to one embodiment of the invention, the first fault is a short circuit disconnection trip fault and the second fault is a direct loss of power fault.
According to the method, the induction factors before instability are analyzed and distinguished from different fault types, the fault process and the combination factors are disassembled on the basis of the traditional aliasing mechanism analysis means, and then dimension expansion analysis is carried out on the fault cause, so that an evidence chain of the power angle and voltage collapse aliasing type problem of the power grid is formed. The method has good practicability, and reliably analyzes the problems of voltage instability and aliasing faults of power angle faults in the power grid.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a simulation identification method for power grid faults based on power angle and voltage aliasing, which is disclosed in an embodiment of the present invention;
fig. 2(a) is a graph of the relationship between the power angle of the generator and different access points (electrical distances) of the generator set according to the embodiment of the invention;
fig. 2(b) is a graph of a relationship between a time point when the power angle of the generator exceeds 180 degrees and different access points (electrical distances) of the generator set, according to the embodiment of the invention;
FIG. 2(c) is a voltage oscillation graph of bus voltage of 220kV L1 node at different access points of G1, disclosed according to an embodiment of the invention;
FIG. 2(d) is a graph of the relationship between G1Pm/Pe and angular velocity disclosed in accordance with an embodiment of the present invention;
FIG. 2(e) is a dynamic variable transient curve of a 220kV L1 node load motor according to the embodiment of the invention;
FIG. 2(f) is a graph comparing critical state and original state excitation curves disclosed according to an embodiment of the present invention;
FIG. 2(g) is a graph of a 220kV L1 voltage transient of a power angle transient of a generator according to an embodiment of the present invention;
fig. 3 is a block diagram of a power angle and voltage aliasing-based power grid fault simulation identification system disclosed in an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention shall be described in detail with reference to specific embodiments.
The invention relates to a fault-based voltage stabilization and power angle stabilization aliasing mechanism simulation identification method, namely, when power angle stabilization and voltage stabilization are mutually aliased, different types are set through a fault card, so that induction factors before instability are distinguished, and on the basis of a traditional aliasing mechanism analysis means, a fault process and combination factors are disassembled, so that dimension expansion analysis is carried out on fault causes.
A chain of evidence for power angle and voltage collapse aliasing type problems is initially formed. A certain preliminary analysis is given. Mainly related to various parameters such as load characteristics and an automatic control system. I.e., greater relevance to a particular grid structure. Among them, the small sending end system has certain typicality.
The existing control strategy and planning scheme are comparatively analyzed, and a feasible solution is provided. It is pointed out that the use of the chopper strategy may lead to a situation of deteriorating voltage collapse.
According to the analysis method for the aliasing type problem of power angle stability and voltage stability in the formed power grid, when the power angle stability and the voltage stability are aliased mutually, analysis is performed from two dimensions, on the one hand, the power angle stability is started, the determining factor of the power angle stability of a unit is the electrical distance between the unit and a main grid, and a method for gradually shortening the electrical distance is adopted to search a critical electrical access node without instability in a tentative mode; the main factor of the voltage stability in the second aspect is the proportion of the induction motor, the proportion of the motor/constant impedance load is directly adjusted, the motor proportion is gradually reduced, the critical proportion without instability is searched for in a trial mode, and the problem of voltage stability is determined.
Aiming at the problem of aliasing appearance, if the problem is caused by single power angle instability, the method of shortening the electrical distance between the main unit and the main network can be used for reducing the problem; if the problem is caused by the voltage stabilization alone, the induction motor ratio in the region can be reduced by adjusting and reducing; if the problem is a problem of mutual deterioration of the two, the two analysis paths can be used for analysis to determine the mechanism cause of deterioration. Therefore, the invention firstly carries out the tentative analysis according to the two paths and then carries out the comprehensive analysis.
The complexity of the two methods in industrial computational analysis can be summarized into two aspects: firstly, the existing net rack reaches a certain scale after the development of recent decades, is basically formed, and has difficulty in the quantitative analysis of parameters such as the electrical distance. Secondly, the load access quantity and the corresponding model parameters belong to mass data relative to the generator, the difficulty of analyzing one by one is high, and the method adopts a mode of adjusting the proportion of the induction motors in batches to analyze under the current analysis condition.
Fig. 1 is a simulation identification method 100 for a power grid fault based on power angle and voltage aliasing disclosed in an embodiment of a first aspect of the present invention, including:
s1: and carrying out fault scanning on the power grid, and determining that the power angle and voltage instability aliasing fault occurs in the power grid.
S2: and judging whether the power grid has a first fault or not, or whether the power grid has a second fault or not.
S21: and if the first fault occurs to the power grid, determining that the power grid fault is a voltage instability fault.
S22: and if the second fault occurs in the power grid, determining that the power grid fault is a power oscillation fault.
According to an embodiment of the present invention, the determining that the grid fault is a voltage instability fault includes:
s31: and setting a first time, and terminating the event of the power grid where the first fault is located in the first time.
S31: and judging whether the voltage instability fault of the power grid is eliminated, and if the voltage instability fault of the power grid is eliminated, judging that the reason of the voltage instability of the power grid is that the dynamic reactive power of the power grid is insufficient.
S32: and if the grid voltage instability fault is not eliminated, judging that the grid fault is a power angle and voltage aliasing fault, searching for a power angle flying out of the unit, setting a second time, setting non-short-circuit tripping of a grid line where the fault is located in the second time, and cutting off the unit.
According to an embodiment of the present invention, the determining that the grid fault is a voltage instability fault further includes:
s41: and continuously judging whether the grid voltage instability fault is eliminated, and if the grid voltage instability fault is eliminated, judging that the grid voltage instability reason is caused by the removal of the grid excitation system.
S44: and if the grid voltage instability fault is not eliminated, determining that the reason of the grid voltage instability is power angle oscillation.
According to an embodiment of the present invention, the determining that the grid fault is a power oscillation fault includes:
s51: and calculating the center coordinate of the power angle oscillation of the power grid and calculating the voltage instability coordinate of the power grid.
S52: and analyzing the fluctuation condition of the voltage amplitude of each bus from the center coordinate to the power loss area, and determining the electrical distance coordinate of the bus voltage from the oscillation center coordinate according to the voltage amplitude fluctuation rate of the bus.
S53: and calculating the power angle instability probability of the power grid according to the electrical distance coordinate of the bus voltage from the oscillation center coordinate of the power grid and the voltage instability coordinate of the power grid.
According to one embodiment of the invention, the first fault is a short circuit disconnection trip fault and the second fault is a direct loss of power fault.
Regarding the influence of the stability of the electric distance analysis common angle, through measurement analysis and qualitative electric structure analysis, the unit with the farthest electric distance measured by the small sending end system according to the power angle difference is often a large unit at the boundary in fig. 1. Therefore, for the typical unit G1 described in section 1, the power plant access points are adjusted, the access points are gradually changed from the existing operation access points along the direction of the electrical distance from the main network, and the change rule of the relevant electrical quantity is observed.
In this embodiment, 12 typical access points are selected, as shown in fig. 2(a), and a relationship between an electrical distance and a power angle difference between an access point and a main network is given when G1 access points are modified one by one along an electrical path, and it can be seen that power angle instability can be gradually eliminated as the access point gradually moves towards the main network.
Fig. 2(b) corresponds to fig. 2(a), in which the horizontal axis represents the relative electrical distance, the greater the number of the access point corresponding to the horizontal axis, the greater the electrical distance of the access point from the main grid, and the vertical axis represents the time when the power angle difference between the generator set and the reference generator set of the main grid is greater than 180 degrees. The occurrence time can show the transient instability speed of the unit to a certain extent. As can be seen from fig. 2(b), as the electrical distance of the units decreases, the delay time of the "moment of occurrence" during the transient removal of the given three-phase short-circuit fault-protection action for a given unit increases gradually until no destabilization occurs.
For the analysis of the voltage characteristics, a voltage oscillation curve corresponding to the change of the power angle difference is shown in fig. 2 (c).
Fig. 2(c) extracts a voltage transient curve for a typical 220kV load point L1. From fig. 2(c), two characteristics can be seen, firstly, no matter the access point of G1 is changed, the voltage always has an inflection point at 0.24 seconds (absolute event 1.24 seconds) after the fault, the relative stability of the moment of the inflection point is not changed with the change of the access point of G1, and it can be preliminarily determined that the collapse time of the yuxi voltage and the electrical distance between G1 and the main network are in weak correlation and always represent 1.24-1.75 seconds. Second, about 1.24 seconds to 1.75 seconds is a time period during which the reactive absorption amount of the system is maximum and gradually accelerates. The small system voltage transient curve is similar to the typical load point L1 in this case.
For a typical generator electromagnetic-mechanical torque analysis, the following:
the three curves in fig. 2(d) are G1 electromagnetic power Pe, mechanical power Pm, and corresponding rotor angular velocity ω, respectively. As can be seen from fig. 2(d), the G1 deceleration time period is only 0.3 seconds between 1.25 seconds and 1.55 seconds.
Characteristic analysis between a typical motor and a generator is as follows:
as can be seen from fig. 2(e), between 1.25 seconds and 1.55 seconds, due to the coupling problem set by the inertia time constants on the generator side and the load side, the load forms a period of active power and reactive power simultaneously absorbed in a dynamic process after the short-circuit fault line cut-off time (1.1 second time line break-off) relative to before the cut-off time. Regarding the active aspect, the period of the accelerated increase of the load active power demand from 1.25 seconds to 1.55 seconds coincides with the period of the deceleration of the generator, thereby worsening the braking process of the generator rotor, and the rotor angular velocity ω swing type continuously increases, thereby causing the G1 power angle to fly out. Regarding the reactive power, the load reactive power demand from 1.25 seconds to 1.55 seconds firstly and instantaneously impacts to exceed about 1.3 times of the reactive power demand before the fault, and then gradually decreases, the voltage in the period is always lower than the steady state value, so that the electromagnetic torque of the induction motor decreases along with the square value of the voltage, and the voltage decrease also occurs at the same time.
Physical interpretation: under the self-balancing action of the load, after the short-circuit fault is eliminated, a 1-2s recovery period exists, and in the recovery period, if active power and reactive power are absorbed to the system at the same time (relative to a short-circuit period), the system cannot provide enough active power, so that a power angle flies; if not enough dynamic reactive power (corresponding speed and corresponding amount of the excitation system) is provided, a voltage collapse is caused.
In addition, as can be seen from the characteristic of the electrical distance critical state in fig. 2(f), under the current parameter configuration condition, the reactive demand characteristic of the load may pass through a slow fluctuation increasing period of 3-4 seconds after the fault, that is, even under the critical condition after the power angle is stably eliminated, the risk of voltage collapse still exists.
The problem of motor duty change voltage stability is analyzed below.
After the proportion of different induction motors of a certain small system is adjusted, the voltage oscillation mean value of the certain small system is gradually improved along with the gradual reduction of the duty ratio of the induction motor, the critical value is about 32 percent of the duty ratio of the induction motor, and when all small system generators are changed into 100 percent constant impedance, voltage collapse does not occur. The method may be accurate to some extent when the relative net rack is mature.
For the problem of power angle and voltage aliasing stability in the case of the embodiment, power angle instability and voltage instability can be gradually eliminated by continuously reducing the electrical distance between the main line and the potential Eq' after the main force unit is in the transient state.
Fig. 2(g) shows the transient absorption of active power and reactive power of a small system cluster load as a whole.
As can be seen from fig. 2(g), the total reactive power of a small system load reaches 241Mvar at the moment after fault removal, which is 1.67 times of that of the steady state before fault (144.3Mvar), the high demand duration exceeds 4 seconds (from the power oscillation of the unit, exceeds 1, 2 or 3 swings until asynchronous oscillation occurs), and the volatility continues to increase after the power angle swings from 1 st to 4 th; in the third swing period, along with the recovery of voltage, the active power demand of the load is gradually recovered and the reactive power demand is rapidly increased, and the power angle is stable and has the recovery sign, but the active demand of the load is accelerated to rise and recover in the third swing period, so that the braking process of the generator rotor is deteriorated again, asynchronous oscillation is finally formed, and the power angle flies out. The voltage collapse is characterized significantly following the third swing.
Firstly, under the existing access system mode and parameter matching conditions, when a serious fault occurs to generate an aliasing-type problem of small system cluster power angle instability and small system voltage cluster collapse, the small system cluster power angle instability and the small system voltage cluster collapse are in an interactive influence relationship which is not influenced by power angle stability and takes voltage instability as a guide, namely, the power angle instability already shows voltage instability before the power angle instability, and then the deterioration-type interactive influence of the power angle instability and the voltage instability occurs.
Secondly, in the process from the fault moment to the single-side cutting moment to the double-side cutting moment to the recovery process thereafter, the time period within 0.5 second (absolute time 1 second-1.5 second) is the key period for stabilizing the small sending end system, because the voltage can rise in a mutation mode in the fault elimination process and the 1 second thereafter, the load absorbs active power and reactive power to the system simultaneously in the first swing time (reaching the static stability limit of the unit) along with the swing of the power angle, and according to the current parameter configuration, the maximum value of the absorbed reactive power exceeds the reactive power absorbed by the system before the fault. If the system is not able to provide enough reactive power, it will directly result in voltage collapse.
Fig. 3 is a simulation identification system 300 for power grid fault based on power angle and voltage aliasing according to a second embodiment of the present invention, including:
a determining module 301, configured to perform fault scanning on the power grid, and determine that the power angle and voltage instability aliasing fault occurs in the power grid.
The determining module 303 is configured to determine whether the power grid has a first fault or whether the power grid has a second fault.
A first determining module 305, configured to determine that the grid fault is a voltage instability fault if the first fault occurs on the grid.
A second determining module 307, if the second fault occurs to the grid, configured to determine that the grid fault is a power oscillation fault.
According to an embodiment of the invention, the first determining module comprises:
and the setting unit is used for setting a first time and terminating the event of the power grid where the first fault is located in the first time.
The first detection unit is used for judging whether the voltage instability fault of the power grid is eliminated or not, and if the voltage instability fault of the power grid is eliminated, judging that the reason of the voltage instability of the power grid is that the dynamic reactive power of the power grid is insufficient.
And if the grid voltage instability fault is not eliminated, the second detection unit judges that the grid fault is a power angle and voltage aliasing fault, searches for a power angle flying-out unit, sets a second time, sets non-short-circuit tripping of a grid line where the fault is located in the second time, and cuts off the unit.
According to an embodiment of the present invention, the first determining module further includes:
and the third detection unit is used for continuously judging whether the grid voltage instability fault is eliminated or not, and if the grid voltage instability fault is eliminated, judging that the grid voltage instability reason is caused by the removal of the grid excitation system.
And if the grid voltage instability fault is not eliminated, the fourth detection unit judges that the reason of the grid voltage instability is power angle oscillation.
According to an embodiment of the invention, the second determining module comprises:
and the first calculation unit is used for calculating the center coordinate of the power angle oscillation of the power grid and calculating the voltage instability coordinate of the power grid.
And the second calculation unit is used for analyzing the fluctuation condition of the voltage amplitude of each bus from the center coordinate to the power loss area and determining the electrical distance coordinate of the bus voltage from the oscillation center coordinate according to the voltage amplitude fluctuation rate of the bus.
And the third calculation unit is used for calculating the power angle instability probability of the power grid according to the electrical distance coordinate of the bus voltage from the oscillation center coordinate of the power grid and the voltage instability coordinate of the power grid.
According to one embodiment of the invention, the first fault is a short circuit disconnection trip fault and the second fault is a direct loss of power fault.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units or modules is only one logical division, and there may be other divisions when the actual implementation is performed, for example, a plurality of units or modules or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of modules or units through some interfaces, and may be in an electrical or other form.
The units or modules described as separate parts may or may not be physically separate, and parts displayed as units or modules may or may not be physical units or modules, may be located in one place, or may be distributed on a plurality of network units or modules. Some or all of the units or modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional units or modules in the embodiments of the present application may be integrated into one processing unit or module, or each unit or module may exist alone physically, or two or more units or modules are integrated into one unit or module. The integrated unit or module may be implemented in the form of hardware, or may be implemented in the form of a software functional unit or module.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (6)
1. The power angle and voltage aliasing-based power grid fault simulation identification method is characterized by comprising the following steps of:
s1: carrying out fault scanning on the power grid, and determining power angle and voltage instability aliasing faults of the power grid;
s2: judging whether the power grid has a first fault or not, or judging whether the power grid has a second fault or not;
s21: if the first fault occurs in the power grid, determining that the power grid fault is a voltage instability fault;
the determination that the grid fault is a voltage instability fault comprises
S211: setting a first time, and terminating the event of the power grid where the first fault is located in the first time;
s212: judging whether the voltage instability fault of the power grid is eliminated, and if the voltage instability fault of the power grid is eliminated, judging that the reason of the voltage instability of the power grid is that the dynamic reactive power of the power grid is insufficient;
s213: if the grid voltage instability fault is not eliminated, judging that the grid fault is a power angle and voltage instability aliasing fault, searching for a power angle runaway unit, setting a second time, setting non-short circuit tripping of a grid line where the voltage instability fault is located in the second time, and cutting off the unit;
s214: whether the grid voltage instability fault is eliminated is continuously judged, and if the grid voltage instability fault is eliminated, the grid voltage instability reason is judged to be caused by the removal of the grid excitation system;
s215: if the grid voltage instability fault is not eliminated, judging that the grid voltage instability reason is power angle oscillation;
s22: and if the second fault occurs in the power grid, determining that the power grid fault is a power oscillation fault.
2. The method of claim 1, wherein the determining that the grid fault is a power oscillation fault comprises:
s51: calculating the center coordinate of the power angle oscillation of the power grid and calculating the voltage instability coordinate of the power grid;
s52: analyzing the fluctuation condition of the amplitude of each bus voltage from the central coordinate of the power angle oscillation to a power loss area, and determining the electrical distance coordinate of the bus voltage from the central coordinate of the power angle oscillation according to the voltage amplitude fluctuation rate of the bus;
s53: and calculating the power grid power angle instability probability according to the electrical distance coordinate of the bus voltage from the center coordinate of the power grid power angle oscillation and the power grid voltage instability coordinate.
3. The method of claim 1, wherein the first fault is a short disconnect trip fault and the second fault is a direct loss of power fault.
4. Power angle, voltage aliasing based power grid fault's simulation identification system, its characterized in that, the system includes:
the determining module is used for scanning faults of the power grid and determining power angle and voltage instability aliasing faults of the power grid;
the judging module is used for judging whether the power grid has a first fault or not or whether the power grid has a second fault or not;
the first determining module is used for determining that the power grid fault is a voltage instability fault if the first fault occurs in the power grid;
the first determining module includes:
the setting unit is used for setting first time and terminating the event of the power grid where the first fault is located in the first time;
the first detection unit is used for judging whether the voltage instability fault of the power grid is eliminated or not, and if the voltage instability fault of the power grid is eliminated, judging that the reason of the voltage instability of the power grid is that the dynamic reactive power of the power grid is insufficient;
the second detection unit is used for judging that the power grid fault is a power angle and voltage instability aliasing fault if the power grid voltage instability fault is not eliminated, searching for a power angle flying out of the unit, setting a second time, setting non-short-circuit tripping of a power grid line where the voltage instability fault is located in the second time, and cutting off the unit;
the third detection unit is used for continuously judging whether the grid voltage instability fault is eliminated or not, and if the grid voltage instability fault is eliminated, judging that the grid voltage instability reason is caused by the removal of the grid excitation system;
a fourth detection unit, configured to determine that the power grid voltage instability cause is power angle oscillation if the power grid voltage instability fault is not eliminated;
and the second determining module is used for determining that the power grid fault is a power oscillation fault if the second fault occurs in the power grid.
5. The system of claim 4, wherein the second determining module comprises:
the first calculation unit is used for calculating a center coordinate of the power angle oscillation of the power grid and calculating a voltage instability coordinate of the power grid;
the second calculation unit is used for analyzing the fluctuation condition of the amplitude of each bus voltage from the central coordinate of the power angular oscillation to the power loss area and determining the electrical distance coordinate of the bus voltage from the central coordinate of the power angular oscillation according to the fluctuation rate of the amplitude of the bus voltage;
and the third calculation unit is used for calculating the power angle instability probability of the power grid according to the electrical distance coordinate of the bus voltage from the center coordinate of the power grid power angle oscillation and the power grid voltage instability coordinate.
6. The system of claim 4, wherein the first fault is a short disconnect trip fault and the second fault is a direct loss of power fault.
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