Improved power loop VSG low-voltage ride through method and system

• Main Authors: ZHAO JINBIN, WANG SHANGXING, MAO LING, LI XIANGJUN, HUI DONG, ZHANG YUYU, QI WANNIAN, JIA XUECUI, QIANG TONGBO, LYU CHENGYUAN
• Format: Patent
• Language: Chinese; English
• Published: 09.03.2021
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses an improved power loop VSG low-voltage ride through method and system, and the method comprises the steps: taking a result obtained through the multiplication of a power angleincrement of a virtual synchronous generator and a synchronization coefficient during a short-circuit fault of a power grid as a control instruction of an active frequency loop, and transmitting the control instruction of the active frequency loop to the active frequency loop of the virtual synchronous generator; designing a voltage instruction in a reactive voltage loop of the virtual synchronousgenerator, and sending the voltage instruction in the reactive voltage loop of the virtual synchronous generator to the reactive voltage loop of the virtual synchronous generator; generating a virtual impedance input instruction, and sending the virtual impedance input instruction to the virtual synchronous generator; and generating a switching tube control instruction according to the output voltage reference value of th