Reactive Power-Coordinated Control of a Synchronous Condenser and VSC-HVDC in the Sending-Side Near Region Power Grid of an LCC-HVDC

doi:10.12204/j.issn.1000-7229.2023.12.013

Abstract

Abstract:

Commutation failure on the receiving side can be caused by a fault in the line commutated converter-based HVDC (LCC-HVDC) on the sending side, and an over-compensated reactive power increases the risk of commutation failure. In this paper, for a transmission system in which the sending-side LCC-HVDC is in parallel with a synchronous condenser and voltage source converter-based HVDC (VSC-HVDC), the reactive power control mechanisms and response characteristics of synchronous condenser and VSC-HVDC are discussed. We observe that the over-compensated reactive power of VSC-HVDC increases the risk of commutation failure of the LCC-HVDC, and the reactive power regulation capacity of the synchronous condenser is not fully utilized. Based on this, a reactive power-coordinated control scheme between the synchronous condenser and VSC-HVDC is proposed to accelerate the reactive power response of the VSC-HVDC, reduce the excess reactive power compensation to reduce the risk of commutation failure of the LCC-HVDC, and improve utilization of the reactive power regulation capacity of the synchronous condenser. Finally, simulation results of typical examples reveal that the proposed scheme can fully utilize the dynamic reactive power regulation capacity of the synchronous condenser, inhibit transient low voltage at the moment of fault, and reduce the risk of commutation failure after the fault is cleared.

Key words: LCC-HVDC, sending side, over reactive power compensation, commutation failure, synchronous condenser, VSC-HVDC, reactive power coordinated control

CLC Number:

TM721.1

LI Dahu, LI Jia, ZHOU Yue, RAO Yuze, ZHOU Hongyu, YAO Wei. Reactive Power-Coordinated Control of a Synchronous Condenser and VSC-HVDC in the Sending-Side Near Region Power Grid of an LCC-HVDC[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(12): 148-160.

Figures/Tables 18

Fig.1 Interconnected transmission system of the LCC-HVDC and VSC-HVDC with synchronous condenser access

Fig.2 Block diagram of constant AC voltage control of the VSC-HVDC

Fig.3 Respond process diagram of constant AC voltage control of the VSC-HVDC

Fig.4 Response process diagram of three scenarios

Fig.5 Reactive power response characteristics of the synchronous condenser and VSC-HVDC under a voltage drop

Fig.6 Reactive power response characteristics of the synchronous condenser and VSC-HVDC under a voltage leap

Fig.7 Block diagram of the reactive power coordinated control of the synchronous condenser and VSC-HVDC

Fig.8 Comparison of control effect under balanced fault

Fig.9 Comparison of commutation failure suppression capabilities under a balanced fault

Fig.10 Comparison of commutation failure suppression capabilities under an unbalanced fault

Fig.11 Comparison of commutation failure suppression capabilities under an unbalanced fault

Fig.12 Comparison of control effects under a voltage leap

Fig.13 Comparison of control effects under different communication delays

Table A1 The main parameters of VSC-HVDC and LCC-HVDC

Table A2 The main parameters of synchronous condenser

Fig.A1 Valve side current on the inverter side of LCC-HVDC under voltage drop

Fig.A2 Valve side current on the inverter side of LCC-HVDC under balanced fault

Fig.A3 Valve side current on the inverter side of LCC-HVDC underunbalanced fault

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