Converter grid-connected device and system for grid-connected photovoltaic power station
A photovoltaic power station, photovoltaic module technology, applied in photovoltaic power generation, circuit devices, AC network circuits, etc., can solve problems such as unreliable work, high engineering cost, and complicated structure.
Active Publication Date: 2020-10-23
王阳
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Problems solved by technology
Traditional large and medium-sized photovoltaic power plants such as image 3 As shown, it must be equipped with an inverter to convert the direct current generated by the solar photovoltaic cell into alternating current. In order to be connected to the grid for long-distance transmission, a transformer and a reactive power compensation device required by the grid must be configured. This structure requires the configuration of many components. Relatively cumbersome and complicated, high engineering cost and unreliable work
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[0012] Combine below Figure 1 to Figure 2 , the present invention is described in further detail.
[0013] refer to figure 1 , a converter and grid-connected device for grid-connected photovoltaic power stations, including N converter units, and the converter units include overvoltage protectors R i1 , R i2 and capacitance C i1 、C i2 、C i3 、C i4 and inductance L i1 , L i2 And N bridge circuits, where the subscript i∈[1,N]; the positive and negative poles of the input terminal of the i-th converter unit respectively pass through the overvoltage protector R i1 , R i2 ground, capacitor C i1 、C i2 It is connected in series between the positive and negative poles of the input terminal of the i-th converter unit; the positive and negative poles of the input terminal of the i-th converter unit form the positive and negative poles of the input terminal of the i-th bridge circuit, and the positive and negative poles of the output terminal of the first bridge circuit pole ...
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The invention relates to the technical field of solar power generation control, in particular to a converter grid-connected device for a grid-connected photovoltaic power station. The device comprisesa converter unit; the converter unit comprises an overvoltage protector, a capacitor, an inductor and a bridge circuit; the positive and negative electrodes of the input end of the converter unit aregrounded through the overvoltage protector; the capacitor is serially connected between the positive and negative electrodes of the input end of the converter unit; the positive and negative electrodes of the input end of the converter unit form the positive and negative electrodes of the input end of the bridge circuit; and the output ends of the bridge circuit are connected in series through the inductor. The invention further discloses a system composed of the device. According to the device, an original system is simplified, the project cost is reduced, and the working reliability is improved; numerous additional functions of power flow control, electric energy quality control and the like can be realized on the basis of realizing original basic functions, so that a power grid has higher stability; a more flexible power transmission mode is realized; and a more effective control means is provided for the intelligent power grid.
Description
technical field [0001] The invention relates to the technical field of solar power generation control, in particular to a commutation and grid connection device and system for a grid-connected photovoltaic power station. Background technique [0002] High-efficiency, clean, and renewable energy generation technologies represented by wind energy and solar energy are highly valued by countries all over the world. How to safely connect these power sources to the system needs to solve the problem of high-power, high-efficiency, and high-quality energy conversion and control. Solar photovoltaic power generation is of great significance to optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. By the end of 2018, the domestic photovoltaic installed capacity had reached 174.63GW. Undoubtedly, it is of great practical significance to improve the safe and economic operation level of photovoltaic power stations...
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IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 王阳王潇朱玥荣
Owner 王阳