Work

Coordinated control strategy for MMC-CLCC considering AC voltage support and active power transmission

Year: 2025

Type: article

Abstract: • Revealed the dynamic process of the MMC-CLCC under receiving-end AC faults. • Clarified the power characteristics of the CLCC. • Determined DC current, active power, and reactive power operating ranges of CLCC. • Proposed MMC-CLCC coordinated control to support AC voltage and DC power. The hybrid HVDC transmission system employing the Modular Multilevel Converter (MMC) at the sending end and the Controllable Line-Commutated Converter (CLCC) at the receiving end offers advantages such as avoiding commutation failures and providing reactive power support to the sending end, thus holding promising application prospects. This paper analyzes the dynamic process of MMC and CLCC under receiving-end AC faults, as well as the power characteristics of the CLCC. It determines operational ranges of DC current, active power, and reactive power under fault conditions, and proposes a coordinated control strategy for MMC and CLCC that addresses both AC voltage support and DC power transmission. This strategy introduces reactive power sensitivity constraints to determine the reduction amount of the CLCC’s extinction angle. Meanwhile, the rectifier side calculates the maximum operating points of DC current and active power based on extinction angle command and the receiving-end AC voltage magnitude to control the DC current. Finally, two cases of three-phase short-circuit faults with different severities in the receiving-end AC system are simulated using PSCAD/EMTDC. The simulation results verify that the proposed coordinated control strategy can provide support for receiving-end AC system during fault period and ensure DC power transmission capability.

Source: International Journal of Electrical Power & Energy Systems

DOI: 10.1016/j.ijepes.2025.111185

Authors: Weiru Wang, Yanhui Guo, Yechun Xin, Guoqing Li, Tuo Wang, Yanxu Wang

Institution: Northeast Electric Power University

Language: English

Topic: HVDC Systems and Fault Protection

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $3,920