A closed-loop zero-sequence voltage injection method for cascaded h-bridge converters
A zero-sequence voltage and converter technology, applied in the field of current conversion, can solve the problems of complex calculation, single application conditions, and low precision, and achieve the effects of high control precision, accurate control, and reduced error
Active Publication Date: 2021-04-13
TIANJIN UNIV
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Problems solved by technology
[0004] Aiming at the problems of traditional zero-sequence voltage generation methods such as complex calculation, low precision, and single application conditions, the present invention proposes a closed-loop zero-sequence voltage injection method applied to cascaded H-bridge converters, which is applied to the phase-to-phase power of cascaded H-bridge converters. control
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[0033] The specific implementation of the present invention for cascaded H-bridge converter power balance will be described below in conjunction with the diagrams, so that those skilled in the art can better understand the present invention. Taking the grid-connected cascaded H-bridge converter as an example, figure 1 is the topological diagram of the embodiment of the present invention under this working condition. Such as figure 1 As shown, the cascaded converter is composed of H-bridge converter module units with the same structure in series. The DC side of each module unit can be connected to source-load equipment such as batteries, photovoltaics, and DC loads, so as to realize the connection of low-voltage source-load devices. High voltage grid. Since the power emitted by each module is different, and the three-phase grid-connected current needs to be balanced, at this time, a zero-sequence signal must be injected into the three-phase modulation signal to control the th...
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The invention discloses a closed-loop zero-sequence voltage injection method applied to a cascaded H-bridge converter. The method is applied to the phase-to-phase power control of the cascaded H-bridge converter, and can realize zero-sequence voltage under various working conditions with a relatively low calculation amount. Quickly generate and accurately control the output power of each phase of the cascaded H-bridge converter in the form of closed-loop control. Its characteristics are: obtain the duty ratio of the cascaded H-bridge three-phase and the actual output power of each phase; make the difference between the given power of each phase and the actual output power of each phase, and send them to the proportional-integral controller respectively, so as to obtain the gain of each phase coefficient; then multiply and sum the gain coefficients of each phase and the instantaneous value of the output current to obtain the zero-sequence voltage V to be injected zero ; Finally, inject the zero-sequence voltage V zero Inject into the duty ratios of the three phases respectively to obtain the duty ratios at the next moment, and output the driving signals corresponding to the duty ratios.
Description
technical field [0001] The present invention relates to the field of current conversion technology, in particular to a closed-loop zero-sequence voltage injection method applied to cascaded H-bridge converters. Specifically, the method is applied to phase-to-phase power control of cascaded H-bridge converters, and can be used in a relatively The low computational load realizes the rapid generation of zero-sequence voltage under various working conditions, and accurately controls the output power of each phase of the cascaded H-bridge converter in the form of closed-loop control. Background technique [0002] Converter technology is a technology that converts electrical energy from DC to AC or AC to DC, and plays an important role in today's industrial applications. The cascaded H-bridge converter is widely used in high-voltage and high-power energy supply occasions. Its principle is to use the H-bridge circuit composed of four switching tubes as the basic unit, and build the...
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IPC IPC(8): H02M7/219
CPCH02M7/219H02M1/007Y02B70/10
Inventor 杜李扬何晋伟李梦一
Owner TIANJIN UNIV