A control method and device for a three-phase unbalance compensation device
A technology of balance compensation and control method, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc. The effect of reducing switching loss and conduction loss and improving efficiency
Active Publication Date: 2021-02-12
SHENZHEN TIEON ENERGY TECH
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Problems solved by technology
A small compensation current in a phase of a three-phase system does not help the compensation of the entire system, but instead increases losses and reduces efficiency in vain
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[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0017] It should be noted that like numerals and let...
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The embodiment of the invention provides a control method and device for a three-phase unbalance compensation device, which relates to the technical field of power electronics. The method comprises the following steps: receiving the A-phase current rms value, the B-phase current rms value and the C-phase current rms value sent by the current acquisition unit; calculating a first compensation value, a second compensation value and a third compensation value according to the A-phase current rms value, the B-phase current rms value and the C-phase current rms value; when the first switching unitis in an operating state, if the absolute value of the first compensation value is smaller than the first preset value, controlling the first switching unit to stop operating; when the second switching unit is in an operating state, if the absolute value of the second compensation value is smaller than the first preset value, controlling the second switching unit to stop operating; when the thirdswitching unit is in the operating state, if the absolute value of the third compensation value is smaller than the first preset value, controlling the third switching unit to stop operating. The method effectively reduces the self-loss of the three-phase unbalance compensation device.
Description
technical field [0001] The present invention relates to the technical field of power electronics, in particular to a control method and device for a three-phase unbalance compensation device. Background technique [0002] In the low-voltage three-phase four-wire power supply system for urban residents and rural power grids, most of the power users use single-phase loads or mixed single-phase and three-phase loads, and the loads are different and the power consumption time is different, resulting in low-voltage power supply. The long-term imbalance of the three-phase load in the system not only increases the copper loss of the line and the transformer, but also increases the iron loss of the transformer, reduces the power of the transformer and even affects the safe operation of the transformer, and finally causes the imbalance of the three-phase voltage. [0003] With the development of the power electronics industry, the three-phase unbalance compensation device based on po...
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IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 迟屹楠章林
Owner SHENZHEN TIEON ENERGY TECH