Self-adaptive voltage and current cooperative controller for improving electric energy quality of flexible micro-grid
A self-adaptive voltage and power quality technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of few system harmonics in VCM and difficult adjustment of DG unit line harmonic current, so as to achieve accurate tracking of current and improve Power control accuracy, the effect of precise power control
Inactive Publication Date: 2021-10-19
天津滨电电力工程有限公司 +4
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Problems solved by technology
However, the traditional VCM is difficult to regulate the harmonic current of the DG unit line
Therefore, VCM is rarely used to solve system harmonic problems
Method used
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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0038] Adaptive voltage-current cooperative controllers to improve the power quality of flexible microgrids, such as figure 1 As shown, it includes a microgrid circuit, an improved power control loop, an improved virtual impedance loop, a mode selection module, and a frequency adaptive voltage-current cooperative controller. The microgrid circuit is respectively connected to the improved power control loop and the frequency adaptive voltage-current cooperative control The controller, the improved power control loop, the improved virtual impedance loop and the mode selection module are respectively connected to the frequency adaptive voltage-current cooperative controller.
[0039] The microgrid circuit includes: a distributed power generation unit, an LCL filter, and a local load or a public coupling point PCC connected to the distribution network or microgri...
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The invention relates to a self-adaptive voltage and current cooperative controller for improving the electric energy quality of a flexible micro-grid. An integral term is added in a power control loop in an interface converter of a traditional voltage and current cooperative controller, and a frequency self-adaptive voltage and current cooperative controller is constructed. Therefore, under the condition that the frequency of a micro-grid changes, a distributed power generation unit can well achieve the system harmonic compensation performance, and the power control precision of a distributed power generation unit set when the frequency disturbance occurs in the micro-grid is improved. Due to the fact that a simple integral term is added in a traditional active power frequency control scheme, accurate power control of the controller under power grid voltage frequency disturbance is guaranteed. The frequency self-adaptive voltage and current cooperative controller is constructed, so that the distributed power generation unit set can accurately track the current even if the frequency of harmonic distortion is influenced due to the fundamental frequency change of the micro-grid.
Description
technical field [0001] The invention belongs to the field of distribution network operation control, in particular to an adaptive voltage-current cooperative controller for improving the power quality of a flexible micro-grid. Background technique [0002] Distributed generation (DG) units based on renewable energy sources (RES) are increasingly integrated into the power distribution system, and the proportion of nonlinear loads in various loads is getting higher and higher. At the same time, the nonlinear loads in the grid The application can cause harmonic pollution of the distribution network. Power electronic converters with LCL filters are used as efficient interfaces between renewable energy sources and the grid, the interface converters usually have a higher control bandwidth and can be actively regulated without using any additional harmonic filtering devices Power quality in power distribution systems. [0003] The control scheme of the DG unit is divided into two...
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Patent Timeline
Login to View More IPC IPC(8): H02J3/01H02J3/24H02J3/38
CPCH02J3/01H02J3/241H02J3/381H02J3/388H02J2300/20H02J2203/20Y02E40/40
Inventor 何晋伟徐科郭培健霍现旭孙柏杨李浩然厉成元徐晶王利辉姚程余真刘娟
Owner 天津滨电电力工程有限公司