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1. (WO2017198042) DIRECT-CURRENT BUS VOLTAGE FLUCTUATION SUPPRESSION METHOD AND CONTROL METHOD FOR DUAL-PWM CURRENT CONVERTER

Pub. No.:    WO/2017/198042    International Application No.:    PCT/CN2017/081712
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Tue Apr 25 01:59:59 CEST 2017
IPC: H02M 1/14
H02J 1/02
H02M 5/458
Applicants: GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI
珠海格力电器股份有限公司
Inventors: ZHANG, Xuefen
张雪芬
JIANG, Shiyong
蒋世用
LIU, Keqin
刘克勤
FENG, Chongyang
冯重阳
YUAN, Jinrong
袁金荣
JIANG, Yingyi
姜颖异
NI, Weitao
倪卫涛
Title: DIRECT-CURRENT BUS VOLTAGE FLUCTUATION SUPPRESSION METHOD AND CONTROL METHOD FOR DUAL-PWM CURRENT CONVERTER
Abstract:
A direct-current bus voltage fluctuation suppression method and control method for a dual-PWM current converter. The direct-current bus voltage fluctuation suppression method comprises the following steps: establishing a power balance equation among a grid side, a load side and an intermediate capacitor (200); establishing a capacitor instantaneous active power small-signal model of the intermediate capacitor; establishing a load instantaneous active power small-signal model of the load side; calculating a grid-side instantaneous active power reference value (p*) according to the capacitor instantaneous active power small-signal model, the load instantaneous active power small-signal model and the power balance equation; and performing feedback control over the grid-side current converter (100) by using a grid-side instantaneous active power reference value as a power reference. The grid-side reference value contains direct-current bus voltage ripple waves and state change information of the load (400), and the effectiveness is high. In addition, the impact of load changes on the bus voltage is considered in the adjustment of the grid-side current converter, thereby reducing fluctuation of the direct-current bus voltage.