SOCVF Feedforward and Phase Compensation Factor Switching Control Method for Grid-connected Inverter in Weak Grid
A phase compensation and control method technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as bandwidth reduction and system instability, and achieve the effect of eliminating influence, high shear frequency, and simplifying complexity
Active Publication Date: 2020-04-03
YANSHAN UNIV
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Problems solved by technology
In order to eliminate the influence of grid background harmonics, the common method is to introduce MSFRR. In the case of weak grid, due to the influence of grid impedance, the bandwidth of the system is reduced. When the bandwidth of the system is smaller than the maximum resonant frequency of the introduced SFRR, the system will be unstable.
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[0042] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.
[0043] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.
[0044] figure 1 It shows a SOCVF feed-forward and phase compensation factor switching control method for grid-connected inverters under weak grid conditions according to the present invention, which is used to improve the stability of grid-connected inverters under weak grid...
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The invention provides a SOCVF feedforward and phase compensation factor switching control method of grid-connected inverter under weak power network. The method comprises: The fundamental component of the PCC voltage at the common coupling point is extracted by SOCVF in front of the PLL, Ud and uq generated by PLL are used as voltage feedforward quantities to eliminate the positive feedback branch introduced by voltage proportional feedforward. The phase compensation factor switching method based on impedance modulus judgment is used to compensate the phase of MSFRR. The invention provides acontrol method for grid-connected inverter under weak power network, so as to eliminate the influence of grid impedance on the grid-connected control system of the inverter. The stability of the system is greatly improved, and the adaptability of the system is strong, and the power factor is high, and the ability to suppress the background harmonics of the power network is improved, so that the inverter control system can maintain a high shear frequency, phase margin and gain margin, and the system 's rapidity and stability is enhanced.
Description
technical field [0001] The invention relates to the technical field of inverter grid-connected control, in particular to a SOCVF feedforward and phase compensation factor switching control method for a grid-connected inverter under a weak grid. Background technique [0002] As the penetration rate of renewable energy such as wind energy and solar energy continues to increase, it has also brought great challenges to the traditional power grid. Due to the influence of factors such as long-distance transmission lines and the leakage inductance of step-up transformers, the line impedance becomes larger , At the same time, because of the continuous switching of power electronic equipment and the existence of nonlinear loads, there are a large number of background harmonics in the power grid. These two factors make the traditional grid a weak grid. Traditional power grids usually use grid voltage proportional feedforward to eliminate grid voltage interference. In the case of weak...
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IPC IPC(8): H02J3/38H02J3/01H02J3/24
CPCH02J3/01H02J3/24H02J3/383H02J3/386Y02E10/56Y02E10/76Y02E40/40
Inventor 柴秀慧崔文超张纯江赵晓君白洁
Owner YANSHAN UNIV