Coordinated Control Strategy and Simulation of Multi-region Inertial Support for LCC/VSC Hybrid Infeed Power System

doi:10.12204/j.issn.1000-7229.2022.05.012

Abstract

Abstract:

After the Yu-E back-to-back flexible direct current system was put into operation, the asynchronous interconnection of the Southwest and Central China power grids was realized, and an LCC/VSC hybrid infeed power system including the Southwest power grid and Three Gorges generators, VSC and LCC such as Longzheng HVDC was formed. Aiming at the system stability requirements after AC or DC failures under such a typical structure, this paper considers giving full play to the fast adjustable characteristics of VSC and LCC, and proposes a coordinated control system involving AC lines, generator sets, VSC and LCC. The core is the coordinated control strategy of inertial support of VSC/LCC, which can realize the inertia supporting and auxiliary frequency modulation of the entire hybrid system. An electromagnetic transient simulation system including three-region AC power grids and detailed models of VSC and LCC is established, and typical AC and DC faults that may cause instability have also been analyzed and simulated. Under the action of coordinated control strategies, the system can quickly recover to new stability operation status, so as to meet the needs of dynamic power coordinated control of AC/DC power grids in the near area.

Key words: voltage source converter(VSC), line commutation converter(LCC), hybrid infeed power system, inertial support, frequency control

CLC Number:

TM712

LEI Xiao, XIA Yongjun, YANG Shangjin, WANG Weiwei, CHEN Kun, LI Xinnian. Coordinated Control Strategy and Simulation of Multi-region Inertial Support for LCC/VSC Hybrid Infeed Power System[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(5): 109-116.

Figures/Tables 6

Fig.1 Network structure of LCC/VSC hybrid infeed power system

Fig.2 Equivalent model of hybrid infeed power system

Fig.3 Overall framework of coordinated control system for inertial support

Fig.4 Control logic of active power/frequency coordination

Fig.5 Waveform of coordinated control strategy for inertia support

Fig.6 Frequency Waveform of LCC monopole block

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