Control Method of Energy Storage Bidirectional Converter System for Harmonic Compensation
A bidirectional converter, harmonic compensation technology, applied in harmonic reduction device, AC network to reduce harmonics/ripple, AC network circuit, etc., can solve the harmonic characteristics variation, harmonic compensation failure, communication cost and control requirements
Active Publication Date: 2019-06-14
STATE GRID SHANDONG ELECTRIC POWER +2
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Problems solved by technology
But the disadvantage is that due to the limitation of installation and use site, nonlinear loads are generally installed far away from the energy storage bidirectional converter, and the harmonic characteristics collected through the feeder line are relatively different from the real harmonic characteristics of the nonlinear load. Large variation, resulting in failure of harmonic compensation
However, if the traditional long-distance communication has a huge amount of harmonic information, the communication cost and control requirements will be greatly increased, which is not conducive to engineering applications.
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[0055] In order to make the object, technical solution and advantages of the present invention clearer and clearer, the control method of the energy storage bidirectional converter system for harmonic compensation proposed by the present invention will be further described below with reference to the accompanying drawings and specific examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0056] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0057] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the ex...
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The invention relates to an energy storage bidirectional converter system for harmonic compensation and a control method, and belongs to the technical field of harmonics reduction. The invention solves the problem of excessive nonlinear load harmonic current by utilizing the existing energy storage bidirectional converter in the micro grid, and optimizes the power quality of the micro grid. The invention eliminates the influence of the long distance feeding line and improves the harmonic compensation effect by directly collecting the nonlinear load side harmonic information. A voltage and current model is established; the harmonic current characteristic value and the PCC point characteristic emitted by the nonlinear load are extracted by a signal measurement coding device; the communication information amount is compressed, and the harmonic information is transmitted through a narrowband wireless communication device; and a local controller receives the information of the signal measurement coding device and then decodes the information, so as to restore the real load harmonic current, thereby realizing the closed-loop proportional resonance control of the energy storage bidirectional converter, and realizing the accurate compensation of the harmonic current of any number of times. The invention has the advantages of low cost, excellent effect and simple engineering realization.
Description
technical field [0001] The invention relates to a control method for an energy storage bidirectional converter system used for harmonic compensation, and belongs to the technical field of harmonic reduction. Background technique [0002] The increasingly serious problems of environmental pollution and energy crisis have prompted the proportion of distributed new energy power generation in my country's power generation energy structure to increase year by year. However, the distributed new energy power generation system is easy to fluctuate with the environment and unpredictable. impact on reliability and power quality. As an energy storage medium, the battery energy storage system has two-way power capability and flexible adjustment characteristics, which can effectively improve the negative impact of the power fluctuation and intermittency of renewable energy generation on the power grid, and improve the acceptance of distributed new energy by the power grid. ability, so it...
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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 王瑞琪王超安树怀孙振海徐志根慕世友靳占新吴绍军许玮
Owner STATE GRID SHANDONG ELECTRIC POWER