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Harmonic Power Sharing Control Method for Parallel Inverters Under Nonlinear Load

A non-linear load and harmonic power technology, applied in AC network circuits, electrical components, single-network parallel feeding arrangements, etc., can solve the problem that the inverter cannot share the load power evenly with the rated capacity, so as to avoid direct calculation, Avoid geographical restrictions and reduce the effect of harmonic circulation

Active Publication Date: 2019-12-24
西安芯派新能源汽车动力控制研究院有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling harmonic power equalization of parallel inverters under nonlinear loads, which solves the problem that each inverter cannot equally share the load power according to its rated capacity when the parallel inverters are operating in an island

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  • Harmonic Power Sharing Control Method for Parallel Inverters Under Nonlinear Load
  • Harmonic Power Sharing Control Method for Parallel Inverters Under Nonlinear Load

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] The harmonic power sharing control method of parallel inverters under nonlinear load in the present invention relies on multiple inverter parallel systems, such as figure 1As shown, it includes multiple distributed power sources. Multiple distributed power sources are merged into the common AC bus after passing through inverters, filters and transmission lines, and then supply power to the load from the common AC bus. The load can be resistive, inductive, or capacitive. sexual or non-linear;

[0047] Such as figure 2 , image 3 As shown, the harmonic power sharing control method of parallel inverters under nonlinear load in the present invention is implemented according to the following steps:

[0048] Step 1, sampling the output voltage u of the inverter x o_x , bridge arm inductor current i L_x and output current i o_x , where...

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Abstract

The invention discloses a parallel inverter harmonic power sharing control method based on self-regulating virtual harmonic impedance. Firstly the output voltage amplitude and the phase angle value are obtained by using the droop control algorithm and the voltage reference value is synthesized and outputted, then the self-regulating virtual harmonic impedance algorithm is added and the output voltage instruction is obtained, and output capacitive voltage inductance current double closed-loop control is performed. As for the self-regulating virtual harmonic impedance algorithm, the harmonic current information is introduced to construct the variable virtual harmonic impedance, the self-regulating droop relation between the harmonic current and the virtual harmonic impedance is established and the harmonic current distribution is dynamically regulated. According to the improved virtual harmonic impedance mechanism, the output impedance of the system is reconstructed by using the self-regulating method so that the harmonic circulating current can be reduced and then the total circulating current can be reduced without communication between all the inverters or feeder impedance detection, and adaptive harmonic power sharing can be performed.

Description

technical field [0001] The invention belongs to the technical field of new energy distributed power generation in power systems and power sharing control when island microgrid inverters operate in parallel, and in particular relates to a harmonic power sharing control method for parallel inverters under nonlinear loads. Background technique [0002] Environmental pollution and energy crisis are becoming more and more serious. With the development and application of new energy generation technologies such as photovoltaics, hydropower and wind power, and to coordinate the contradiction between large power grids and distributed power sources, the application of micro-grids has emerged. The inverter is used as the interface of the distributed power supply to connect to the microgrid, so that a large number of microsources are integrated into the microgrid, forming a multi-inverter parallel environment. [0003] When the microgrid system supplies power to nonlinear loads, the har...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
CPCH02J3/388H02J3/46
Inventor 任碧莹孙凯歌孙向东李宁
Owner 西安芯派新能源汽车动力控制研究院有限公司
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