A single-phase multi-module cascaded h-bridge converter voltage balance control method
A technology of voltage balance and control method, applied in the field of smart grid, can solve the problem of not considering the coupling effect, affecting the dynamic performance of the system control loop, etc., to achieve the effect of improving dynamic performance, low voltage stress, and reducing coupling effect
Active Publication Date: 2019-05-03
HAIHUA ELECTRONICS ENTERPRISECHINA CORP
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Problems solved by technology
However, when designing the voltage balance controller, the coupling effect between the additional voltage balance controller and the main control system is not considered in the case of voltage imbalance, which will affect the dynamic performance of the entire system control loop.
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[0030] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0031] A single-phase multi-module cascaded H-bridge converter voltage balance control method can maintain DC side voltage balance and can effectively reduce the coupling effect between an additional voltage balance controller and a main control system.
[0032] figure 1 A power main circuit of cascaded H-bridge converters for single-phase N modules (wherein N=1, 2,...,n).
[0033] figure 2 The main controller of the cascaded H-bridge converter adopts a double closed-loop control in the static coordinate system, including the voltage outer loop and the current inner loop. After the dual closed-loop output common modulation ratio, the cascaded H-bridge conversion is realized under the carrier phase shift modulation The stable output of the sum of the DC side voltages o...
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The invention discloses a voltage balance control method for single-phase multi-module cascading H-bridge converters. The voltage balance control method comprises the following steps: using a double closed loop control structure as a main controller of a system under a static coordinate system, and outputting a common modulation ratio of the system; realizing direct-current side voltage balance of each H-bridge converter by a voltage balance controller, obtaining the modulation ratio correction of the previous N-1 H-bridge converters by a grading ring, obtaining the modulation ratio correction of the N-th H-bridge converter by getting the minimum value of a coupling effect coefficient, and overlapping the modulation ratio correction of N H-bridge converters with the common modulation ratio of the system respectively to form the modulation ratio of the N H-bridge converters, so that active power of each H-bridge converter is distributed according to requirements, and direct-current side voltage balance for each H-bridge converter is maintained, wherein N is greater than or equal to 2. According to the method disclosed by the invention, high power grid side unit power factor and high power grid current sine degree can be realized, and the coupling effect between the additional voltage balance controller and the main control system is reduced.
Description
technical field [0001] The invention relates to the field of smart grids, in particular to a voltage balance control method for a single-phase multi-module cascaded H-bridge converter. Background technique [0002] In recent years, with the continuous advancement of the construction of smart grids and distributed power generation, high-voltage and high-power intelligent power electronic equipment has become more and more widely used in industry, and the performance requirements for power switching devices have also increased. Although in recent years Power semiconductor technology has made great progress in the past, and power switching devices of new materials such as SiC and CaN have been developed. However, limited by the current technology level, the mutual restriction between the power level and switching frequency of a single switching device is still Couldn't get a good solution. [0003] The cascaded H-bridge converter is an effective technical solution to solve the...
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IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/38H02M7/53873
Inventor 蒋传荣李刚刘林海詹涛张宁黄远豪
Owner HAIHUA ELECTRONICS ENTERPRISECHINA CORP