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Grid-connected inverter synchronous control modeling method for series-parallel capacitance compensation

A technology of synchronous control and capacitance compensation, which is applied in reactive power compensation, adjustment of electrical variables, and control/regulation systems, etc., can solve problems such as the influence of grid-connected system control stability, and is conducive to stability and facilitates theoretical and simulation analysis. , beneficial to improve and enhance the effect

Inactive Publication Date: 2021-11-23
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] Although series-parallel capacitor compensation can maintain the voltage stability of the grid-connected system, studies have shown that both series compensation capacitors and parallel compensation capacitors will have an impact on the control stability of the grid-connected system

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  • Grid-connected inverter synchronous control modeling method for series-parallel capacitance compensation
  • Grid-connected inverter synchronous control modeling method for series-parallel capacitance compensation
  • Grid-connected inverter synchronous control modeling method for series-parallel capacitance compensation

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Embodiment Construction

[0050] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0051] figure 1 It is the equivalent circuit diagram of photovoltaic grid-connected inverter system with series-parallel capacitor compensation, in which parallel and series capacitors are important means to maintain voltage stability at the grid-connected point. However, since the series-parallel capacitor directly affects the output side voltage of the grid-connected inverter, and the output-side voltage is the input signal for its synchronous control in the inverter control, the introduction of the series-parallel capacitor will indirectly affect the grid-connected inverter. The stability of the synchronous con...

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Abstract

The invention discloses a grid-connected inverter synchronous control modeling method for series-parallel capacitance compensation, and belongs to the technical field of new energy power generation. The method comprises the following steps: S1, carrying out Norton equivalence on a grid-connected inverter system; S2, combining the series-parallel capacitance compensation and the equivalent power grid, and then carrying out Thevenin equivalence; S3, obtaining an expression of the grid-connected voltage according to the superposition theorem; S4, substituting the grid-connected voltage into the inverter synchronous control block diagram, and performing equivalent transformation on the synchronous control system to obtain a synchronous control equivalent model. According to the method, the series-parallel capacitor can be established in the synchronous control equivalent model, theoretical and simulation analysis can be conveniently performed on the system, and the influence of the series-parallel capacitor on the system stability can be intuitively deduced through the model, so that the improvement of the control stability of the grid-connected inverter system is facilitated, and the method is worthy of being popularized and used.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a synchronous control modeling method for grid-connected inverters for series-parallel capacitor compensation. Background technique [0002] Under the dual-carbon background of "carbon neutrality and carbon peaking", new energy power generation will gradually replace traditional energy sources as my country's main source of electricity. However, large-scale photovoltaic, wind power and other new energy power stations are mostly built in remote areas far from load centers. On the one hand, the grid connected to the grid is relatively weak. On the other hand, the grid is prone to failure, which makes the new energy power station face an extremely weak grid situation. These two factors will lead to a large grid impedance in the grid-connected system and cause voltage problems in the system. Reactive power compensation is an effective measure to solve system vol...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18H02M3/156H02M7/5387
CPCH02J3/381H02J3/1821H02M3/156H02M7/5387H02J2203/20H02J2300/24Y02E10/56Y02E40/30
Inventor 张前进刘宿城刘晓东方炜沈浩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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