Structure and control strategy of a multi-converter type three-phase unbalanced load comprehensive regulation system
A technology of comprehensive regulation and system structure, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, and AC network circuits, etc. Power quality, the effect of improving power factor
Active Publication Date: 2019-12-10
STATE GRID SHANDONG ELECTRIC POWER +2
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Problems solved by technology
To realize functions such as balanced three-phase current, reactive power compensation and harmonic control, a single converter needs to have a higher withstand voltage level and higher insulation protection measures for the switching tubes, but if the converter needs to compensate for a certain phase The current exceeds the limit value of the converter itself, and the control may be unstable at this time
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[0017] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the 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.
[0018] The embodiment of the present invention provides a multi-converter type three-phase unbalanced load comprehensive regulation system structure, which is characterized in that multiple converters are connected in parallel in the three-phase four-wire power grid system, and the high / low performance of the multi-modules is complementary Coordinate the grid connection of the converters, and adopt distributed compensation instead of the traditional comprehensive compensation control strategy. The first converter near the low-voltage side of the transformer is a high-performance converter, which can filter out the three-phase unbalanced harmonic ...
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The invention discloses a multi-converter type three-phase unbalanced load comprehensive adjustment system structure and control strategy. A plurality of converters are connected in parallel in a three-phase four-wire power grid system, and multi-module high / low performance complementary coordinated current conversion The transformer is connected to the grid, and the traditional comprehensive compensation control strategy is replaced by distributed compensation. The first converter close to the low-voltage side of the transformer is a high-performance converter, which can filter out the three-phase unbalanced harmonic current of the power grid, and the remaining low-performance converters Even distribution control three-phase unbalanced active current and reactive current. The invention achieves the distribution control purpose of balancing three-phase active power, reactive power compensation and harmonic control functions, improves the power quality, improves the power factor of the distribution transformer, and further improves the service life and efficiency of the transformer.
Description
technical field [0001] The invention relates to the field of a three-phase unbalanced load comprehensive regulation system, in particular to a multi-converter type three-phase unbalanced load comprehensive regulation system structure and control strategy. Background technique [0002] Modern precision experimental instruments, automatic production control equipment, and various sensitive loads operate in the power grid, all of which require high power quality. Therefore, problems such as three-phase unbalanced current, harmonic pollution, and low power factor in the low-grid three-phase four-wire system need to attract more and more attention. To realize functions such as balanced three-phase current, reactive power compensation and harmonic control, a single converter needs to have a higher withstand voltage level and higher insulation protection measures for the switching tubes, but if the converter needs to compensate for a certain phase The current exceeds the limit val...
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IPC IPC(8): H02J3/26H02J3/01H02J3/18
CPCH02J3/01H02J3/1842H02J3/26Y02E40/30Y02E40/40Y02E40/50
Inventor 韩小岗黄光政樊相臣李向奎巩晓静梁慧媛孙琳牛蔚然王晶蔡国伟刘闯秦广涛万振东
Owner STATE GRID SHANDONG ELECTRIC POWER