Virtual synchronous coordinate system-based direct power control method of grid-connected inverter

• Main Authors: YU DINGFENG, WU HAOWEI, WU DALI, ZUO CHAO, ZHENG ZHONGXIANG, ZHANG PING, WEI HUA, YANG YONG, GENG PAN, JIANG BO, LI WENHUA, SUN YU, YUAN YANG, CHEN TAO, CAI KAI, WANG JIANXUN, YANG WENTIE, XU LIN, LUO WEI, LEI JIN, XU ZHENGXI, XIE WEI, YU YUETING
• Format: Patent
• Language: Chinese; English
• Published: 21.12.2016
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a virtual synchronous coordinate system-based direct power control method of a grid-connected inverter. The control scheme is implemented in a virtual synchronous coordinate system; a phase angle of a power grid voltage vector does not need to be constantly detected by use of a phase-locked loop; and meanwhile, a current decoupling compensation term related to an inlet inductor is eliminated and the dependency of a control system on inductor parameters is reduced. Meanwhile, the direct power control method has self-adaptive capacity on a power grid frequency deviation, and can be used as supplement and extension of a power grid voltage orientation-based direct power control scheme under the condition that the deviation exists in voltage phase and frequency detection. Furthermore, the virtual synchronous coordinate system-based direct power control method can be used for various forms of PWM power converters of solar energy and biomass energy grid-connected inverters, AC transmission equ