CN201349185Y - Self-regulated building generating system utilizing solar energy - Google Patents

Abstract

The utility model relates to a self-adjusting building power generation system utilizing solar energy, comprising a photovoltaic module, a DC/DC converter, an energy storage battery, a DC/AC converter, an output transformer, an interlocking contactor group, a power generation and power supply control system, and an external Power supply line; the photovoltaic power generation module is connected to the input end of the DC/DC converter, and the DC/DC converter is controlled by the power generation and power supply control system through the DC/DC controller 1 to convert the power generated by the photovoltaic power generation panel into output current and voltage All adjustable, stable DC power; the output of the DC/DC converter is connected to the battery and the input of the DC/AC converter or photovoltaic inverter; the output of the DC/AC converter or photovoltaic inverter is connected to the The input ends of the single-input multi-tap output transformer are connected; and the output ends of the single-input multi-tap output transformer are connected with the input ends of the interlock contactor group.

Description

A self-adjusting building power generation system using solar energy

technical field

The utility model relates to a building power generation system, in particular to a self-adjusting power generation system utilizing solar energy, which belongs to the technical field of new energy sources.

Background technique

As a clean and pollution-free energy source, the use of solar energy has been paid more and more attention. Since the 1980s, developed countries such as Europe, the United States, Japan, and China have successively developed solar power systems and solar lighting systems. At present, solar energy utilization for buildings is mainly focused on solar heating and heat storage. This type of solar energy utilization has low energy utilization efficiency and requires a large amount of heat storage medium to store energy, which is not conducive to energy conversion and effective utilization. The solar photovoltaic power generation system directly aimed at buildings is currently mainly focused on power supply to auxiliary power systems, such as public lighting signs and other low-power occasions. Since solar photovoltaic panels are easily affected by the external environment, the output power of their power generation varies greatly with the change of light, and power shortage or excess power often occurs, which affects the normal operation of building electrical appliances. This makes the photovoltaic solar power generation system Powering the building presents difficulties.

Contents of the invention

The purpose of this utility model is to provide a self-adjusting power generation system using solar energy. The power generation system provides power supply to certain building loads by shunting, giving priority to photovoltaic power supply. When the photovoltaic energy is insufficient, the control system controls the contactor group. Action (switching) control, the external power grid supplies power to the building's internal loads.

In order to achieve the above purpose, the technical solution of the present invention is: the power generation system includes a solar photovoltaic power generation module (1), a DC/DC converter (2), an energy storage battery (3), a DC/AC converter or a photovoltaic inverter (4), single-input multi-tap output transformer (5), interlock contactor group (6), power generation and power supply control system (7), external power supply line (8), controller 1, controller 2, controller 3. BMS controller.

In the building power generation system described above, the power generated by the photovoltaic power generation panel is preferentially converted into direct current with stable output characteristics through the DC/DC module. The power demand of the power generation module controls the DC/DC controller 1 to set the output voltage of the DC/DC converter to realize the control of the output current and voltage of the DC/DC converter. BMS (Battery Management System) detects the battery capacity (SOC), and decides to charge or discharge the battery according to the control instructions of the power generation and power supply control system.

The building power generation system has multiple outputs, and supplies power to users through the interlock contactor group (6). The power generation and power supply control system determines the number of transformer taps to supply power to users according to the power generation of the photovoltaic module (related to solar radiation) and the battery power. Through the control of the interlock contactor group (6) by the power generation and power supply control system (7), it is determined whether the loads powered in the building are powered by the photovoltaic system or by the external electric line (8).

The DC/DC converter (2) has the functions of adjustable current output and adjustable voltage output, and the control command of the output current or output voltage is given and controlled by the power generation and power supply control system (7). The output voltage of the DC/DC converter (2) is adjustable, and the command is given and controlled by the power generation and power supply control system (7). The control of the DC/DC converter (2) has two functions, one is the constant voltage output when the battery is relatively full, in fact, it directly supplies power to the load through DC/AC; the other is the constant current output, in different Under light conditions, through the optimization of the power generation and power supply control system (7), the optimal power generation efficiency control parameters of the photovoltaic module are determined, and the output current of the DC/DC converter is determined.

The beneficial effects of the utility model: by detecting the power generation and output power of the photovoltaic cell panel and the electric quantity of the storage battery, the maximum efficiency of photovoltaic solar power generation can be realized by controlling the tap of the adjustable transformer of the photovoltaic cell panel; when the output power of the photovoltaic cell panel When it is insufficient, through the switching operation of the contactor group, the conversion from photovoltaic power supply to grid power supply is realized, which improves the reliability of the system.

Below in conjunction with accompanying drawing and embodiment the utility model is described in more detail.

Description of drawings

Fig. 1 is the solar power generation building system diagram of the utility model;

Fig. 2 is the DC/DC converter and its control system of the solar power generation system of the present utility model;

Fig. 3 is the storage battery of the solar power generation system of the present invention and its management system;

Fig. 4 is the DC/AC converter and its control system of the solar power generation system of the present utility model;

Fig. 5 is a block diagram of the power generation and charging control system of the solar power generation system of the present invention;

Detailed ways

With reference to Fig. 1, this is the utility model solar power generation building system diagram.

As shown in the figure, the photovoltaic power generation module (1) is connected to the input end of the DC/DC converter (2), and the DC/DC converter is controlled by the power generation and power supply control system (7) through the DC/DC controller 1 Control, convert the power generated by the photovoltaic power generation panel into direct current with adjustable output current and voltage and stable characteristics. The output of the DC/DC converter is respectively connected with the storage battery (3) and the input end of the DC/AC converter (or photovoltaic inverter) (4). On the one hand, it provides electric energy to charge the battery, and the charging process is managed by the power generation and power supply control system (7) through the BMS (Battery Management System); on the other hand, it converts the DC power into an AC power whose output can be adjusted and the frequency is industrial frequency , the DC/AC converter (or photovoltaic inverter) (4) is also regulated and controlled by the power generation and power supply control system (7) through the DC/AC controller 2 . The output end of the DC/AC converter (or photovoltaic inverter) (4) is connected to the input end of the single-input multi-tap output transformer (5); and the output end of the single-input multi-tap output transformer (5) is connected to the interlock The input ends of the contactor group (6) are connected, and the number of taps at the output end of the single-input multi-tap output transformer (5) and the interlocking contactor group (6) are all controlled by the power generation and power supply control system (7).

Referring to Fig. 2, it is a DC/DC converter of the solar power generation system of the present invention.

As shown in the figure, the DC/DC controller adopts a full-bridge or half-bridge conversion circuit. In this system, the DC/DC conversion controller 1 controls the switching on and off of the switch in the DC/DC circuit to invert the DC voltage. After the voltage is transformed by the transformer, it is rectified to obtain a DC voltage, that is, the power generated by the photovoltaic solar cell office is converted into a DC power with an adjustable output voltage. The DC/DC conversion controller 1 is controlled by the power generation and power supply control system. When the battery capacity is full, the DC/DC converter works in the constant voltage output mode, stops supplying power to the battery, and directly transmits electric energy to the load through the DC/AC converter at the back end; the other mode is power generation and power supply control The system optimizes according to the change of the output power of the photovoltaic cell caused by different lighting conditions, determines the optimal power generation efficiency control parameters of the photovoltaic module, and determines the output current of the DC/DC converter. At this time, the DC/DC module works in the constant current output mode .

Referring to Fig. 3, it is the storage battery and its management system of the solar power generation system of the present utility model. Among them, the BMS battery management system detects the voltage of the battery through a voltage sensor (such as a Hall sensor) connected to the battery, and obtains the current SOC value of the battery according to the discharge characteristic curve of the battery pre-stored in the BMS system, and then the power of the battery can be obtained. . At the same time, the BMS obtains the charging/discharging current of the battery through the current sensor (such as a Hall sensor) at the battery end, and feeds back the current information to the power generation and power supply control system. The power generation and power supply control system determines the power supply strategy of the battery according to the battery SOC given by the BMS, the state of charge and discharge current, and the power of the electric load and the power generated by the photovoltaic battery, and controls it by adjusting the given input of the DC/DC controller The DC output voltage of the DC/DC converter is used to control the charging of the battery.

Referring to Fig. 4, it is the DC/AC converter and its control system of the solar power generation system of the present invention.

As shown in the figure, the inverter controller 2 converts the front-end DC/DC and battery output direct current into power-frequency alternating current by controlling the closing and closing of the switching devices of the inverter bridge, and provides it to the rear-end single-input multi-tap output transformer. The single-input multi-tap input transformer converts the input AC power of the DC/AC converter (photovoltaic inverter) into AC power of the mains specification for supply to users. Since the solar photovoltaic power generation system is greatly affected by sunlight, its output voltage and power change and fluctuate in a large range. If it is directly supplied to users through DC/DC and then to DC/AC, the energy storage of the front-end converter will be increased. The input of components (such as inductors) and the unfavorable conditions such as low conversion efficiency and complicated control. The preceding problems can be solved by simply introducing a single-input multi-tap input transformer.

Referring to FIG. 5 , it is a block diagram of the power generation and charging control system of the solar power generation system of the present invention.

As shown in the figure, the power generation and power supply control system is connected to each sub-controller (controller 1, controller 2, controller 3, BMS) in the system through the charging and power generation control system through the communication bus (including CAN, 485, etc.) , accept the detection information of each controller to its subsystems, and give the control instructions of each controller through the control rate, so as to achieve and realize the control purpose of the overall system. Among them, the controller of the interlock contactor group is the controller 3, which is controlled by the power generation and charging system. Connection, so as to realize the function of power switching.

Although the utility model has been described with reference to the above-mentioned embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, and it should be understood that various changes and modifications can be made therein. In a broad sense, it does not depart from the utility model, so it is not as a limitation to the utility model, as long as it is within the scope of the essential spirit of the utility model, changes and deformations to the above-mentioned embodiments will fall into the claims of the utility model protected range.

Claims (4)

1. A self-adjusting building power generation system using solar energy, characterized in that it includes a solar photovoltaic power generation module (1), a DC/DC converter (2), an energy storage battery (3), a DC/AC converter or a photovoltaic inverter switch (4), output transformer (5), interlock contactor group (6), power generation and power supply control system (7), external power supply line (8); The solar photovoltaic power generation module (1) is connected to the input end of the DC/DC converter (2), and the DC/DC converter is controlled by the power generation and power supply control system (7) through the DC/DC controller 1, and the photovoltaic power generation panel The generated energy is converted into direct current with adjustable output current and voltage and stable characteristics; the output of the DC/DC converter is respectively connected to the battery (3) and the input end of the DC/AC converter or photovoltaic inverter (4); the DC The output end of the AC converter or photovoltaic inverter (4) is connected to the input end of the single-input multi-tap output transformer (5); and the output end of the single-input multi-tap output transformer (5) is connected to the interlock contactor group (6) is connected to the input terminal. 2. The self-adjusting building power generation system as claimed in claim 1, characterized in that: said system is powered by a shunt, which is powered by photovoltaics. When the photovoltaic energy is insufficient, it is controlled by the action switching of the contactor group, and the power is supplied by the external power grid. Power supply for loads inside the building. 3. The self-adjusting building power generation system according to claim 1, characterized in that: the DC/DC controller adopts a full-bridge or half-bridge conversion circuit, and controls the switching on and off of the switch in the DC/DC circuit to realize DC voltage step-up/step-down conversion. 4. The self-adjusting building power generation system according to claim 1, characterized in that: the power generation and power supply control system is connected with the controller 1, the controller 2, the controller 3, and the BMS through the communication bus, and receives each The controller detects the information of its subsystems, and gives the control instructions of each controller through the control rate.

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