An Evaluation Method for SVM Modulation Strategy of Cascaded Multilevel Converter
A cascading multi-level, strategy evaluation 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 the optimization result is too one-sided and the SVM modulation strategy cannot be fully optimized , to achieve the effect of strong applicability and good flexibility
Active Publication Date: 2018-09-18
NANCHANG INST OF TECH
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[0004] At present, the optimization of the SVM modulation strategy is mainly aimed at an independent index, and the obtained optimization results are often too one-sided to fully optimize the SVM modulation strategy.
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[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementations described here are only used to illustrate and analyze the present invention, and are not intended to limit the present invention.
[0017] Such as figure 1 Shown, the specific embodiment of the present invention comprises the following steps:
[0018] Step 1. Determine the evaluation factors to be used according to the converter topology and load requirements, figure 1 The evaluation factors shown include converter operating efficiency, system scalability, supply voltage utilization, converter reliability, output voltage harmonic distortion rate, output voltage deviation rate, power factor, and output common-mode voltage.
[0019] Step 2: compare the actual output power quality index of the converter and the difference between the performance of the converter and the expected value, an...
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The invention discloses a method for evaluating the SVM modulation strategy of a cascaded multilevel converter. Including: determine the required evaluation factors according to the converter topology and load demand; compare the actual output power quality indicators of the converter and the difference between the converter performance and the expected value, and determine the evaluation criteria for each evaluation factor; determine the evaluation factors of each evaluation factor. According to the evaluation factors, the evaluation criteria and the comprehensive evaluation function, the evaluation model of the SVM modulation strategy is determined. According to the system operating state and output power quality, the weights of various evaluation factors are adjusted, and the comprehensive evaluation function is re-established. The SVM modulation strategy evaluation method of the cascaded multilevel converter provided by the present invention is a systematic evaluation method combining qualitative and quantitative, and has the advantages of systematicness and practicability. In addition, the method for evaluating the SVM modulation strategy of the cascaded multilevel converter provided by the present invention has the characteristics of good flexibility, strong applicability and the like for selecting evaluation factors.
Description
technical field [0001] The invention relates to the modulation field of cascaded multilevel converters, in particular to a method for evaluating SVM modulation strategies of cascaded multilevel converters. Background technique [0002] Cascaded multilevel converters use low-voltage power electronic devices to realize high-voltage and high-power electric energy conversion, and are widely used in medium- and high-voltage high-power conversion devices, such as high-voltage direct current transmission, static synchronous compensators and active power filters, photovoltaic power generation and Fuel cell power generation and other devices such as high-power high-voltage variable-frequency motor drives. [0003] Pulse modulation technology is one of the key technologies that directly affect the voltage control performance of multilevel converters and converter performance. The flat converter has the advantages of high utilization rate of DC voltage, low switching frequency, and sm...
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IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 王翠欧阳俊铭杨小品张扬朱能飞
Owner NANCHANG INST OF TECH