Voltage equalization control circuit and method of DC capacitors in multilevel converter
A DC capacitor and voltage equalization control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as inconsistency of DC capacitor voltage
Inactive Publication Date: 2019-05-03
STATE GRID JIANGSU ELECTRIC POWER CO LTD TAIZHOU POWER SUPPLY BRANCH +1
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[0005] The purpose of the present invention is to address the problems existing in the prior art, provide a voltage equalization control circuit and method for DC capacitors in multilevel converters, and solve the problem of inconsistent voltages of DC capacitors in multilevel converters
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[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0021] Such as figure 1 As shown, the present invention provides a voltage equalization control circuit for DC capacitors in a multilevel converter, including: a multilevel converter circuit and a control circuit, and the multilevel converter circuit includes a multilevel converter, a filter circuit and AC power grid, the control circuit includes a digital control chip 12 and a drive circuit 13, the digital control chip 12 includes a digital signal processing chip and a logic control...
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The invention discloses a voltage equalization control circuit and method of DC capacitors in a multilevel converter. The voltage of each DC capacitor connected in series with a DC side of the multilevel converter is sampled, voltage sampling values of two adjacent DC capacitors are subjected to subtraction to obtain a voltage difference, the voltage difference is subjected to a proportional-integral PI operation, a zero-sequence current reference value that is opposite to the voltage difference is generated, and combined with a sampling value of alternating current, an abc three-phase currentcommand Iabc* including a zero sequence component is obtained by using three-dimensional dq0 / abc inverse transform. According to the invention, the voltage equalization control of the DC capacitors can be achieved by controlling zero sequence current through a current tracking control link, which is simple and easy to implement.
Description
technical field [0001] The invention relates to the technical field of multilevel converters, in particular to a voltage equalization control circuit and method for DC capacitors in multilevel converters. Background technique [0002] Diode clamp multi-level circuit refers to the use of multiple diodes to clamp each switch tube, and then use different switch states to obtain different output levels. The function of the diode clamp in the circuit is to limit the terminal voltage of the switching device to one terminal voltage of a certain DC capacitor. Its control is not much different from the two-level circuit, and it is easier to realize the two-way flow of active power, and at the same time, it is more convenient to control the power factor. [0003] Due to the clamping effect of the diode, the operating voltage of the switching device is lower than the voltage of the parallel DC capacitor. Therefore, the voltage range of each DC capacitor determines the voltage working...
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IPC IPC(8): H02M7/483H02M7/5387H02M7/5395
Inventor 吴争季昆玉贾俊翁蓓蓓蒋中军牛荣义唐雾婺郑红娟陈良亮孙季泽汤延祺
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD TAIZHOU POWER SUPPLY BRANCH