Additional Compound Damping Control to Suppress Low-Frequency Oscillations in a Photovoltaic Plant with a Hybrid Energy Storage System

Kanglin Dai, Wei Xiong (), Xufeng Yuan (), Huajun Zheng, Qihui Feng, Yutao Xu, Yongxiang Cai and Dan Guo
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Kanglin Dai: College of Electrical Engineering, Guizhou University, Guiyang 550025, China
Wei Xiong: College of Electrical Engineering, Guizhou University, Guiyang 550025, China
Xufeng Yuan: College of Electrical Engineering, Guizhou University, Guiyang 550025, China
Huajun Zheng: College of Electrical Engineering, Guizhou University, Guiyang 550025, China
Qihui Feng: Electric Power Research Institute of Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Yutao Xu: Electric Power Research Institute of Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Yongxiang Cai: Electric Power Research Institute of Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Dan Guo: College of Electrical Engineering, Guizhou University, Guiyang 550025, China

Energies, 2022, vol. 15, issue 23, 1-13

Abstract: The use of the conventional dual closed-loop control strategy by photovoltaic (PV) plants with grid-connected inverters may weaken the damping of a power system, which may aggravate low-frequency oscillations (LFOs). This influence will become more severe as the penetration of PV plants increases. Therefore, it is necessary to incorporate damping controls into PV plants to suppress LFOs. This paper proposed an additional compound damping control (ACDC) system that combines additional damping control (ADC) for the inverter with ADC-based dynamic power compensation control (DPCC), allowing hybrid energy storage systems (HESSs) to suppress LFOs. First, the feasibility of suppressing low-frequency oscillations in PV plants is demonstrated by the torque method and a small signal model. Then, an additional damping controller is added to the active power control link of the PV inverter to enhance the damping abilities of the system. However, given that the damping performance of PV plants with only ADC is limited by the compensated power, PV plants require devices that can rapidly compensate for the damping power. Therefore, we added the HESS to the DC bus and proposed DPCC. Finally, a three-machine nine-node system for a PV plant was modeled and simulated in the PSCAD platform. The simulation results showed that the proposed control strategy could provide effective damping for interarea oscillation.

Keywords: photovoltaic plant; low-frequency oscillation; additional damping control; dynamic power compensation control; hybrid energy storage system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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