Reactive compensation method and device for photovoltaic power generation system, and photovoltaic power generation system
A photovoltaic power generation system and compensation device technology, which is applied in the electric power field, can solve the problems of increasing investment in reactive power compensation devices and poor compensation effects, and achieve the effects of reducing system costs, improving reactive power compensation accuracy, and high-precision automatic reactive power compensation
Active Publication Date: 2014-09-03
深圳市科士达软件科技有限公司
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Problems solved by technology
At present, the reactive power compensation of many photovoltaic power plants still adopts the traditional capacitance compensation method, which requires an increase in investment in reactive power compensation devices
At the same time, the capacitance compensation method generally adopts hierarchical capacitance compensation, so sometimes the compensation effect is poor
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[0026] The invention discloses a reactive power compensation method of a photovoltaic power generation system. The total reactive power Q is obtained from the grid through a reactive power detection device, that is, the direction opposite to the active power output by the photovoltaic inverter is used as the reactive power detection device. Positive direction: the reactive power scheduling device collects or receives the total reactive power Q output by the reactive power detection device, and the reactive power scheduling device performs the following operations:
[0027] A. Detect the number of photovoltaic inverters currently connected to the grid and the power level P 1 ,P 2 …P n (For example, 500KW photovoltaic inverter is 500), and add the power levels of all photovoltaic inverters to get the power level and P all ;
[0028] B. Use the power level P of all photovoltaic inverters currently connected to the grid 1 ,P 2 …P n respectively divided by the power rating an...
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The invention provides a reactive compensation method and a device for a photovoltaic power generation system, and the photovoltaic power generation system. According to the reactive compensation method, the total reactive power is acquired by a reactive power detection device from an electrical network; a reactive scheduling device acquires or receives the total reactive power outputted by the reactive power detection device, through a control ring, a photovoltaic inverter is controlled to output the given reactive power, and thereby the photovoltaic inverter can be controlled in real time to provide reactive power needed by a load. The reactive compensation method is advantaged in that reactive adjusting capability of the photovoltaic inverter is fully utilized, high precision automatic reactive compensation can be realized without an extra reactive power compensator, reactive compensation precision of the system is effectively improved, and system cost is reduced.
Description
technical field [0001] The invention relates to the field of electric power, in particular to a reactive power compensation method and device for a photovoltaic power generation system and the photovoltaic power generation system. Background technique [0002] Reactive power compensation, referred to as reactive power compensation, plays a role in improving the power factor of the power grid in the electronic power supply system, reducing the loss of power supply transformers and transmission lines, improving power supply efficiency, and improving the power supply environment. Therefore, the reactive power compensation device is in an indispensable and very important position in the power supply system. At present, the reactive power compensation of many photovoltaic power plants still adopts the traditional capacitance compensation method, which requires an increase in investment in reactive power compensation devices. At the same time, the capacitance compensation method ...
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IPC IPC(8): H02J3/18
CPCY02E40/30Y02E10/563Y02E10/56
Inventor 刘程宇吴吉良杨凡贾益黄慧金
Owner 深圳市科士达软件科技有限公司