Method and system for obtaining flicker transmission coefficient of grid connection of photovoltaic power stations
A photovoltaic power station and transfer coefficient technology, which is applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the flicker transfer coefficient error, cannot obtain the flicker transfer coefficient by the actual measurement method, and cannot take into account the impedance of the photovoltaic converter. Frequency characteristics, etc.
Active Publication Date: 2014-04-02
STATE GRID CORP OF CHINA +3
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However, the actual measurement evaluation is mainly used for the radial network. For the interconnected power grid and one or more busbars have not been built, the flicker transfer coefficient cannot be obtained by the actual measurement method. Interaction between to calculate the flicker transfer coefficient
[0004] However, in the time domain analysis, the photovoltaic power supply is usually simplified as a power supply with power fluctuations or a load with negative power, which cannot take into account the frequency characteristics of the impedance of the photovoltaic converter, and the frequency characteristics of the impedance of the photovoltaic converter will affect the transfer of flicker coefficient, ignoring the impedance frequency characteristics of the photovoltaic converter may lead to a huge error in the obtained flicker transfer coefficient
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[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0039] see figure 1 , the embodiment of the present invention discloses a flow chart of a method for obtaining a flicker transfer coefficient of a grid-connected photovoltaic power station, the method comprising the steps of:
[0040] S11. Establish an equivalent circuit diagram of grid-connected photovoltaic power stations;
[0041] The photovoltaic power generation group may be a single photovoltaic power station or multiple photov...
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The invention provides a method and a system for obtaining a flicker transmission coefficient of grid connection of photovoltaic power stations and defines subtransient reactance of a photovoltaic current transformer by considering that the frequency characteristic of impedance of the photovoltaic current transformer is similar to the subtransient reactance of a synchronous power generator and the subtransient reactance of an induction motor. Furthermore, the subtransient reactance of the photovoltaic current transformer can be obtained by utilizing parameters of the photovoltaic current transformer, so that the flicker transmission coefficient between any two nodes in a multi-port network diagram of a photovoltaic power station group, namely the flicker transmission coefficient of grid connection of the photovoltaic power stations, can be accurately obtained, and the difficult problem in the prior art can be further solved.
Description
technical field [0001] The invention relates to the technical field of flicker transfer coefficients of power grids, and more particularly, to a method and system for obtaining flicker transfer coefficients of grid-connected photovoltaic power stations. Background technique [0002] With the intensification of environmental pollution and energy crisis, photovoltaic power stations as new energy sources are being promoted and applied, and a large number of photovoltaic power stations are gradually being connected to the power grid. However, the output power of the photovoltaic power station fluctuates with the fluctuation of the light intensity and the switching of power electronic devices such as photovoltaic converters will cause the voltage fluctuation of the point of common coupling (PCC), that is, flicker. Flicker will be attenuated in different degrees through the power system, and the degree of attenuation can be characterized by the flicker transfer coefficient. Due to...
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IPC IPC(8): H02J3/38
CPCY02E10/563H02J2203/20H02J2300/24H02J3/381Y02E10/56
Inventor 张国连韩永强徐惠平李题印姚海燕包拯民钱浩
Owner STATE GRID CORP OF CHINA