Zhejiang University

China Southern Power Grid Csg Electric Power Research Institute

China Southern Power Grid Co., Ltd.

Wentao Liu

Zheng Xu

Ying Huang

Zheren Zhang

Yan Li

Guoteng Wang

Wangqianyun Tang

Ye Zhang

Yiyan Dong

Baorong Zhou

A method for enhancing transient stability of a renewable energy power system is performed as follows. An external subsystem corresponding to the renewable energy power system is constructed. A first matrix corresponding to the external subsystem based on voltage control is constructed. A second matrix corresponding to the renewable energy power system is generated. A transient stability Lyapunov function corresponding to the renewable energy power system is constructed in real time based on the first matrix and the second matrix. A first control signal corresponding to the renewable energy power system is generated based on Lyapunov's second method. The transient stability of the renewable energy power system is controlled and enhanced in real time based on the first control signal. The first control signal is an adaptive voltage control signal of the renewable energy power system.

Method and system for enhancing transient stability of power system with renewable energy

A dynamic stability control method for power systems with renewable energy, in which a non-linear system of a grid-forming inverter corresponding to a renewable energy power system is created. An external subsystem corresponding to the grid-forming inverter is constructed based on a Lie derivative. According to the external subsystem, a linear sliding surface corresponding to the external subsystem is constructed, and a dynamic stability control unit corresponding to the external subsystem is generated based on sliding mode control. A first instruction data corresponding to the dynamic stability control unit is generated to control dynamic stability of the renewable energy power system in real time. The voltage instruction value of the grid-forming inverter is modified to improve the dynamic stability of the renewable energy power system. A system for implementing such method is also provided.

Method and system for dynamic stability control of power systems with renewable energy

A distributed voltage clamping method for a 100% renewable-energy sending-end grid, including: selecting key nodes from the 100% renewable-energy sending-end grid, including their voltage levels and positions; installing a dynamic reactive power compensation device on each key node, where the dynamic reactive power compensation device is controlled by a constant alternating-current (AC) voltage effective value, and the instruction value of the constant AC voltage effective value is adjustable according to an operation mode; according to AC voltage variation of the sending-end grid under a typical working condition, judging whether the key nodes meet the checking requirements; if not, selecting more key nodes.

Distributed voltage clamping method for 100% renewable-energy sending-end grid

A backup voltage and frequency support method for a 100%-renewable energy sending-end grid, including: (S) selecting a plurality of support nodes in the 100%-renewable energy sending-end grid; (S) mounting a backup voltage and frequency support device at each support node; and (S) dynamically adjusting an active power output of a renewable energy station of the 100%-renewable energy sending-end grid according to a frequency of a grid-connection point.

Backup voltage and frequency support method for 100%-renewable energy sending-end grid

Growing community of inventors

Hangzhou, China

Wentao Liu