Method for suppressing DC overvoltage of static var generator

• Main Authors: GUO JUNHUI, ZHAO WENDONG, CHANG JUNXIAO, WANG LONGFEI, LI JIANHUA, HUA WEN, WU JIAN, LI JIANFEI, ZHANG JING, YE CHENNAN, WANG CHEN, JIN TINGCHAO, CHEN XINJIAN, MA XIULIN, ZHOU HONGQING
• Format: Patent
• Language: Chinese; English
• Published: 23.06.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a static var generator direct-current overvoltage suppression method, which comprises the following steps of: establishing a grid-connected state space model of a static var generator based on equipment control parameters and network topology parameters; substituting a control variable which is currently input into a power system where the static var generator is located into the state space model, and analyzing a key variable which affects the DC overvoltage and a suppression strategy corresponding to the key variable by solving the state space model; and when the key variable meets a preset response condition, simulating the suppression strategy, and determining and selecting the suppression strategy according to a simulation result and executing the suppression strategy. According to the method, the detailed state space model of the SVG in the time from fault recovery to the time when the direct current voltage reaches the peak value is established, so that the key factors causing th