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Multi-micro network distributed harmonic compensation method

A harmonic compensation and distributed technology, applied in the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as poor harmonic suppression effect, achieve good harmonic suppression capability, strong robustness sexual effect

Pending Publication Date: 2019-08-23
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this strategy is less effective in suppressing harmonics at the common coupling point

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  • Multi-micro network distributed harmonic compensation method
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  • Multi-micro network distributed harmonic compensation method

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0045] figure 1 It is the structure diagram of multi-microgrid control. The multi-microgrid is a single-phase three-phase hybrid multi-microgrid, which consists of a three-phase microgrid 1, an A-phase single-phase microgrid 2, a B-phase single-phase microgrid 3, and a C-phase single-phase microgrid 4. The three-phase microgrid 1 includes an energy storage device, a photovoltaic power generation unit and a three-phase load. The A-phase single-phase microgrid 2 , the B-phase single-phase microgrid 3 , and the C-phase single-phase microgrid 4 are separately connected to the three phases A, B, and C of the three-phase microgrid 1 . The entire multi-microgrid is connected to the distribution network through the grid-connecting and disconnecting switch L1. When the parallel an...

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Abstract

The invention relates to a multi-micro network distributed harmonic compensation method. The method comprises steps that a mathematical model of primary control is established; a primary voltage controller is designed, and a control object and a weighting function are taken as generalized controlled objects to construct an optimization problem model for the generalized controlled objects; a quasi-proportional resonant controller is designed; a three-phase voltage at a common coupling point is acquired, a harmonic distortion rate is calculated, secondary control is performed to generate a control signal based on the harmonic distortion rate, and the control signal is transmitted to primary control to achieve harmonic suppression. The method is advantaged in that primary control enables theoutput voltage to be robust, the harmonic distortion rate of the common coupling point is controlled through secondary control by transmitting the compensation signal to primary control, and the output voltage can be made to have stronger robustness and better harmonic suppression capability.

Description

technical field [0001] The invention belongs to the technical field of microgrid control, and in particular relates to a multi-microgrid distributed harmonic compensation method. Background technique [0002] Multi-microgrid is an effective power supply method to exert the performance of distributed power supply. Nonlinear loads in multi-microgrid are the main cause of harmonic generation. Harmonics will reduce the quality of power supply, and even bring great harm to the safe operation of multi-microgrid. In order to ensure the safe and stable operation of multi-microgrid, it is necessary to conduct in-depth research on the harmonic suppression method of multi-microgrid. [0003] In the prior art literature: [0004] Research on Three-level APF Based on Composite Model Predictive Control Strategy (Wang Feng, Zhang Xulong, He Fengyou, etc. Research on Three-level APF Based on Composite Model Predictive Control Strategy[J]. Power System Protection and Control, 2014, 42(11 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 王灿陈思睿梅世颐余宏亮程杉杨楠刘颂凯
Owner CHINA THREE GORGES UNIV