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CRC and NHPWM method for test bench based on cascaded converter

机译：基于级联转换器的CRC和NHPWM测试台方法

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摘要

This study describes a megawatt test bench based on the cascaded converter for the stability test of renewable energy generation system under different grid disturbances. The test bench is composed of two cascaded converters, which are used to control the output of fundamental voltage and harmonic voltage. Aiming at the defects of the traditional repetitive controller (RC) and hybrid pulse-width modulation (HPWM) method, configurable RC (CRC) and novel HPWM (NHPWM) method are presented. By flexibly configuring the zeros and poles of CRC, the harmonic order that can be tracked accurately and the time delay of CRC can be easily changed. Besides, with NHPWM, the number of modules modulated by carrier phase-shifted PWM can be arbitrarily configured according to the output voltage quality and switching loss. Therefore, the flexible CRC and NHPWM are beneficial to achieve high control accuracy of fundamental and harmonic voltage and fast dynamic response while considering the switching loss, which is verified by simulation. The detailed harmonic analysis and calculation method of NHPWM are given, which are also proved correct by comparison of theoretical calculation and simulation results.
机译：这项研究描述了一种基于级联转换器的兆瓦级试验台，用于在不同电网干扰下进行可再生能源发电系统的稳定性测试。测试台由两个级联转换器组成，用于控制基波电压和谐波电压的输出。针对传统重复控制器（RC）和混合脉宽调制（HPWM）方法的缺陷，提出了可配置RC（CRC）和新型HPWM（NHPWM）方法。通过灵活配置CRC的零点和极点，可以轻松更改可以精确跟踪的谐波阶数和CRC的时间延迟。此外，使用NHPWM时，可以根据输出电压质量和开关损耗任意配置载波相移PWM调制的模块数量。因此，灵活的CRC和NHPWM有助于在考虑开关损耗的同时实现基波和谐波电压的高控制精度以及快速的动态响应，这已通过仿真验证。给出了NHPWM的详细谐波分析和计算方法，并通过理论计算和仿真结果的比较证明是正确的。

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