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Reactive power compensation control method for open-winding dual-inverter photovoltaic power generation system

A technology of photovoltaic power generation system and dual inverters, which is applied in reactive power compensation, photovoltaic power generation, reactive power adjustment/elimination/compensation, etc., and can solve problems such as overmodulation

Active Publication Date: 2020-05-12
HEFEI UNIV OF TECH
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Problems solved by technology

Compared with the existing literature, the present invention introduces in detail the reactive power compensation control method applicable to the open-winding dual-inverter photovoltaic power generation system, which effectively solves the problem of over-modulation, broadens the operating range of the system, and improves the efficiency of photovoltaic power generation

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  • Reactive power compensation control method for open-winding dual-inverter photovoltaic power generation system
  • Reactive power compensation control method for open-winding dual-inverter photovoltaic power generation system
  • Reactive power compensation control method for open-winding dual-inverter photovoltaic power generation system

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[0054] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0055] figure 1 It is a topological structure diagram of an open-winding dual-inverter photovoltaic power generation system implemented by the present invention. The structure is as follows: Photovoltaic array 1 and capacitor C 1 in parallel, while the capacitor C 1 The positive pole is connected to the positive pole of the inverter 1 input, and the capacitor C 1 The negative pole is connected to the negative pole of the inverter 1 input, the photovoltaic array 2 and the capacitor C 2 in parallel, while the capacitor C 2 The positive pole is connected to the positive pole of the inverter 2 input, and the capacitor C 2 The negative pole is connected to the negative pole of the inverter 2 input. The three-phase open-winding transformer is to disassemble the three-phase winding on the primary side of the three-phase transformer. After disassembly, the phase ...

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Abstract

The invention discloses a reactive power compensation control method for an open-winding dual-inverter photovoltaic power generation system. Two groups of photovoltaic arrays in an open-winding dual-inverter photovoltaic power generation system can be controlled by independent MPPT to improve a solar energy utilization rate. However, if affected by shielding or component damage, the two groups ofphotovoltaic arrays may have a great difference in maximum output power, which may cause an over-modulation problem and thus result in poor grid-connected current performance and even system instability. In view of the over-modulation problem of the two groups of photovoltaic arrays, which have a great difference in maximum output power, of the open-winding dual-inverter photovoltaic power generation system, the invention provides a simple and easy-to-implement reactive power compensation control method. The reactive power compensation control method can effectively avoid the over-modulation problems, broadens the maximum power point operating range of the two groups of photovoltaic arrays in the open-winding dual-inverter photovoltaic power generation system, and improves the power generation efficiency of the photovoltaic system.

Description

technical field [0001] The invention belongs to the photovoltaic power generation technology in the field of electrical engineering, and relates to a reactive power compensation control method for an open-winding double-inverter photovoltaic power generation system, in particular to a reactive power compensation control method for an open-winding double-inverter photovoltaic power generation system based on voltage space vector 180° decoupling compensation method. Background technique [0002] Solar photovoltaic power generation is an important form of solar energy utilization. With the continuous development of technology, photovoltaic power generation has gradually become one of the most promising power generation technologies. Photovoltaic inverter, as the core of energy conversion and control of photovoltaic power generation system, has become a research hotspot in recent years. In the field of high-voltage and high-power photovoltaic grid-connected power generation, th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/38
CPCH02J3/18H02J3/385Y02E10/56Y02E40/30
Inventor 张兴宋超王宝基刘芳曹仁贤
Owner HEFEI UNIV OF TECH
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