风电接入真双极柔直系统的送端换流器协调控制策略

李博通; 吝梦媛; 郑光辉; 董岳金; 刘轶超

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风电接入真双极柔直系统的送端换流器协调控制策略

李博通^1,2,3, 吝梦媛^1,2,3, 郑光辉^1,2,3, 董岳金^1,2,3, 刘轶超⁴

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Coordinated Control Strategy of Sending-End Converters for Wind-Integrated Real Bipolar MMC-HVDC Systems

LI Botong^1,2,3, LIN Mengyuan^1,2,3, ZHENG Guanghui^1,2,3, DONG Yuejin^1,2,3, LIU Yichao⁴

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摘要

【目的】采用真双极接线方式的基于模块化多电平换流器的柔性直流输电（modular multilevel converter based high voltage direct current, MMC-HVDC）技术是大规模孤岛风电场高效并网与跨区消纳的主流技术方案之一,在我国张北、江苏如东等直流输电工程广泛采用。然而,送端正负极换流器的控制策略面临平衡双极传输功率和为风电场提供稳定电压支撑的双重挑战。为此,提出了基于有功功率-频率上升/无功功率-电压下垂控制的双极换流器构网协调控制策略。【方法】分析了送端双极换流器接收的有功功率-相位-频率的耦合机理,建立了有功功率-频率上升控制策略,阐明了风电波动下双极换流器功率平衡、频率协调及容量受限工况下的自适应调节机理;揭示了送端双极换流器和风电场电压与无功的耦合关系,建立了受容量和有功功率约束的无功功率-电压下垂控制策略,研究了无功波动时交流母线电压的协调稳定机理。【结果】仿真验证表明,在系统功率波动及单极容量受限等多种情况下,所提策略能有效维持双极换流器间的功率动态均衡,并为交流系统提供稳定的电压频率支撑。【结论】所提构网协调控制策略能够有效应对孤岛风电场柔直送出系统送端双极换流器在复杂工况下的功率平衡与电压频率支撑的核心挑战,提升系统的运行稳定性。

Abstract

[Objective] Modular multilevel converter based high voltage direct current technology (MMC-HVDC) with real bipolar connection is one of the mainstream technical solutions for efficient grid connection and cross-regional consumption of large-scale islanded wind farms. It has been widely adopted in HVDC projects such as Zhangbei and Rudong in Jiangsu. However, the control strategy for the sending-end positive and negative pole converters faces the dual challenge of balancing bipolar transmission power and providing stable voltage support for the wind farm. To address this, a grid-forming coordination control strategy based on active power-frequency boost / reactive power-voltage droop control for bipolar converters is proposed. [Methods] The relationship between the active power received by the sending-end bipolar converters and the phase and frequency is analyzed. An active power-frequency boost control strategy is established, clarifying the power balance and frequency coordination of bipolar converter under wind power fluctuation and the adaptive regulation mechanism under capacity-limited conditions. The coupling relationship between the voltage and reactive power of the sending end converters and wind farm is revealed. A reactive power-voltage droop control strategy with capacity and active power constraints is established. The coordinated stability mechanism of AC bus voltage under reactive power fluctuation is investigated. [Results] Simulation results demonstrate that the proposed strategy can effectively maintain dynamic power balance between the bipolar converters and provide stable voltage and frequency support for the AC system under various conditions, including system power fluctuations and single-pole capacity limitations. [Conclusions] The coordinated control strategy proposed can effectively deal with the core challenges of power balance and voltage and frequency support for the wind farm under complex working conditions, and improve the operation stability of the system.

导出引用

李博通, 吝梦媛, 郑光辉, 董岳金, 刘轶超. 风电接入真双极柔直系统的送端换流器协调控制策略[J]. 电力建设. 0

LI Botong, LIN Mengyuan, ZHENG Guanghui, DONG Yuejin, LIU Yichao. Coordinated Control Strategy of Sending-End Converters for Wind-Integrated Real Bipolar MMC-HVDC Systems[J]. Electric Power Construction. 0

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