Distributed photovoltaic power supply using and collecting system

Abstract

The utility model discloses a distributed photovoltaic power supply using and collecting system with a wireless communication function. According to one specific embodiment, the distributed photovoltaic power supply using and collecting system comprises a transformer substation and a plurality of photovoltaic power supply stations distributed near the transformer substation, wherein the plurality of photovoltaic power supply stations are connected with the transformer substation through intelligent meters; wherein the photovoltaic power station further comprises a photovoltaic power supply, a power supply inverter and a circuit breaker, the power supply inverter is connected between the photovoltaic power supply and the circuit breaker, and the circuit breaker is connected between the power supply inverter and the intelligent meter; the intelligent meter collects station information of the photovoltaic power station and sends the station information to a data center arranged in the transformer substation, and the data center regulates and controls the photovoltaic power station according to preset logic. According to the embodiment of the invention, the metering, regulation and control functions of the electricity utilization information of the distributed photovoltaic power supply terminal are realized, and network services are provided for users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic power supply, in particular to a distributed photovoltaic power supply system. BACKGROUND

[0002] The distributed photovoltaic power supply is composed of multiple single photovoltaic power supplies, and the distributed photovoltaic power supply connected to the power grid has a large voltage fluctuation at the grid connection point due to the dispersion of the power supplies and the influence of the environment and other power supplies, thereby affecting the voltage stability at the grid connection point. Therefore, stabilizing the voltage at the grid connection point and regulating the output of each photovoltaic power supply become urgent problems to be solved. CONTENT

[0003] The present application aims to provide a distributed photovoltaic power supply system to solve the technical problems mentioned in the background section. That is, to solve the problem of difficulty in regulating the grid voltage due to the randomness, volatility and intermittency of the output of the distributed photovoltaic power supply when connected to the voltage grid.

[0004] The present application provides a distributed photovoltaic power supply system, which comprises a substation, multiple photovoltaic power supply stations distributed near the substation, and multiple photovoltaic power supply stations connected to the substation through intelligent meters. The photovoltaic power supply station further comprises a photovoltaic power supply, a power inverter and a circuit breaker, the power inverter is connected between the photovoltaic power supply and the circuit breaker, and the circuit breaker is connected between the power inverter and the intelligent meter. The intelligent meter collects the site information of the photovoltaic power supply station and sends the site information to the data center in the substation, and the data center regulates the photovoltaic power supply station according to a preset logic.

[0005] In some embodiments, the intelligent meter is connected to a user terminal or at least one preset communication base station through a wireless network, and the site information is sent to the user terminal or each communication base station.

[0006] In some embodiments, the data center is in communication connection with the communication base station.

[0007] In some embodiments, the intelligent meter is connected to the data center through a power carrier line, and the site information is sent to the data center.

[0008] In some embodiments, the site information includes the load information and the state information of the photovoltaic power supply station.

[0009] The distributed photovoltaic power supply system provided by the application collects the site information of the photovoltaic power supply station where the intelligent meter is located, and sends the site information to the client or the data center through the communication base station, and sends the regulation and control information of the data center or the client to the power supply inverter to regulate and control the operation of the photovoltaic power supply station, so as to realize the local consumption of the distributed photovoltaic power and the healthy development. BRIEF DESCRIPTION OF DRAWINGS

[0010] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0011] Figure 1 is a structure schematic diagram of the main circuit of the distributed photovoltaic power supply system embodiment of the application;

[0012] Figure 2 is a control structure schematic diagram in the distributed photovoltaic power supply system embodiment of the application. DETAILED DESCRIPTION

[0013] The application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0014] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the accompanying drawings and embodiments.

[0015] REFERENCE Figure 1 , Figure 1 shows the structure schematic diagram of the main circuit in the distributed photovoltaic power supply system embodiment to which the application can be applied.

[0016] As shown in Figure 1 , the distributed photovoltaic power supply system includes a transformer substation 3, a plurality of photovoltaic power supply stations 1 distributed near the transformer substation 3, and an intelligent meter 2, and each photovoltaic power supply station 1 is connected to the transformer substation 3 through the intelligent meter 2. It can be understood that each photovoltaic power supply station 1 is connected to the transformer substation 3 through an intelligent meter 2; the transformer substation 3 and each intelligent meter 2 are connected through a power transmission network.

[0017] The intelligent meter 2 is used to measure the load of the photovoltaic power supply 1, including but not limited to voltage, current, active power, reactive power, power factor, positive and negative active power, etc.

[0018] The aforementioned photovoltaic power station 1 also includes a photovoltaic power source 11, a power inverter 12, and a circuit breaker 13. The power inverter 12 is connected between the photovoltaic power source 11 and the circuit breaker 13; the other end of the circuit breaker 13 is connected to the smart meter 2.

[0019] The aforementioned power inverter 12 is used to invert the DC power generated by the aforementioned photovoltaic power source 11 into AC power. The voltage and frequency of the inverted power are determined by the transmission network of the substation 3 to which it is connected. The aforementioned circuit breaker 13 can disconnect the electrical connection between the aforementioned photovoltaic power station 1 and the aforementioned smart meter 2, disconnect the connection between the photovoltaic power source 11 and the transmission network, and cut off the power supply from the photovoltaic power source 11 to the outside through the transmission network.

[0020] Further, refer to Figure 2 , Figure 2 The control structure diagram of the distributed photovoltaic power supply system in the embodiments of this application is shown below. Figure 2 As shown, the distributed photovoltaic (PV) power generation system includes a communication base station and a data center. The communication base station is communicatively connected to PV power station 1 and smart meter 2, while the data center is communicatively connected to substation 3. The communication base station connects to the data center via a network. The communication base station and data center complete the collection of power data and the control of the distributed power source. Smart meter 2 collects the site information of PV power station 1 and sends the collected site information to the data center located in substation 3. The data center then regulates PV power station 1 according to preset logic.

[0021] The aforementioned site information includes load curve data such as voltage, current, active power, reactive power, power factor, and forward and reverse active power, as well as status information of each device in photovoltaic power station 1. The aforementioned site information includes load information and status information of photovoltaic power station 1, and status information of smart meter 2.

[0022] The aforementioned smart meter 2 can upload the collected site information to the data center via the aforementioned communication base station. Communication between the smart meter 2 and the communication base station can be via RS-485 communication cable, 220V power line carrier, or other means. Communication between the communication base station and the data center can be via fiber optic cable or wireless network. The smart meter 2 interacts with the data center through the communication base station.

[0023] The aforementioned smart meter 2 has a built-in 4G communication module, which interacts with communication base stations and data centers via the 4G network. The smart meter 2 can communicate with the data center via a communication base station or directly with the data center.

[0024] The data center can find the photovoltaic power station 1 bound with the smart meter 2, send a control strategy to the photovoltaic power station 1 through the concentrator, and evaluate the control effect through the updated load curve data of the smart meter 2 after the regulation and control of the regulation and control unit of the photovoltaic power station 1. Alternatively,

[0025] The data center can find the photovoltaic power station 1 bound with the smart meter 2, send a control strategy to the photovoltaic power station 1 through the concentrator, and evaluate the control effect through the updated load curve data of the smart meter 2 after the regulation and control of the regulation and control unit of the photovoltaic power station 1. Alternatively,

[0026] Further, the smart meter 2 is connected with the user terminal or at least one preset communication base station through a wireless network, and sends the site information to the user terminal or each communication base station.

[0027] In this embodiment, the user terminal of the power grid is connected with the smart meter 2 through a wireless network. The user terminal can view the site information of the photovoltaic power station 1 bound with the smart meter 2 within the permission range, and the load curve generated according to the site information and historical data; the user terminal can also regulate and control the operation of the photovoltaic power station 1 within the permission range, so as to realize the peak clipping and valley filling of the power grid load end.

[0028] Further, the data center is connected with the communication base station. The user terminal of the power grid or the data center of the power grid can be connected with the smart meter 2 through the communication base station, and obtain the information of the smart meter 2 through the communication base station; or send a regulation and control instruction to the smart meter 2 through the communication base station.

[0029] Further, the smart meter 2 is connected with the data center through a power carrier line, and sends the site information to the data center. It can be understood that the smart meter 2 is connected with the data center through a power carrier line, and a plurality of smart meters 2 can be connected with the concentrator, and the information is exchanged through a power line carrier signal. Here, the smart meter 2 is used as a collection terminal of the concentrator to obtain the power consumption information of the smart meter user, and the concentrator is used as a centralized terminal to upload the data of a plurality of collection terminals to the data center. The concentrator and the smart meter are connected through a power carrier line, and the data is exchanged through a power line carrier signal. It can be understood that the concentrator can collect a plurality of photovoltaic power stations 1 around it, and obtain the site information of each photovoltaic power station 1 through the smart meter 2 of each photovoltaic power station 1.

[0030] In the embodiments of the present application, the distributed photovoltaic power supply system collects the power consumption / generation data of the photovoltaic power supply station, and the data center regulates and controls the photovoltaic power supply station according to the site information of the photovoltaic power supply station. Compared with the prior art, the present application has the following advantages:

[0031] The voltage information, current information, active power, reactive power, power factor, positive and negative active power, and other information of the photovoltaic power supply station are obtained through the smart meter, the load curve data is generated, and the photovoltaic power supply station is measured.

[0032] The data center evaluates the control effect through the updated load curve data of the smart meter, and the photovoltaic power supply station is observed.

[0033] The communication connection between the data center, the terminal user and the smart meter, the terminal user or the data center can send control instructions to the photovoltaic power supply station through the smart meter, and the photovoltaic power supply station is adjusted.

[0034] The data center and the terminal user send on-off instructions to the circuit breaker through the smart meter, and cut off or connect the connection between the photovoltaic power supply station and the low-voltage power grid, so that the photovoltaic power supply station is controlled.

[0035] The smart meter can be connected to the data center through a communication base station, or can be directly connected to the data center.

[0036] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A system for using a distributed photovoltaic power source, characterized by, The distributed photovoltaic power supply system comprises a transformer substation, a plurality of photovoltaic power supply stations distributed near the transformer substation, and a plurality of intelligent meters connecting the photovoltaic power supply stations with the transformer substation. The photovoltaic power supply station further comprises a photovoltaic power supply, a power inverter and a circuit breaker, the power inverter is connected between the photovoltaic power supply and the circuit breaker, and the circuit breaker is connected between the power inverter and the intelligent meter. The intelligent meter collects site information of the photovoltaic power supply station and sends the site information to a data center arranged in the transformer substation, and the data center regulates and controls the photovoltaic power supply station according to a preset logic.

2. The distributed photovoltaic power system of claim 1, wherein, The intelligent meter is connected with a user terminal or at least one preset communication base station through a wireless network and sends the site information to the user terminal or each communication base station.

3. The distributed photovoltaic power system of claim 2, wherein, The data center is in communication connection with the communication base station.

4. The distributed photovoltaic power system of claim 1, wherein, The intelligent meter is connected with the data center through a power carrier line and sends the site information to the data center.

5. The distributed photovoltaic power system of claim 1, wherein, The site information comprises load information and state information of the photovoltaic power supply station.

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