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新能源电力系统国家重点实验室(华北电力大学),北京市 102206
李再男(1996—),男,博士研究生,主要研究方向:MMC直流输电系统故障穿越控制和恢复、故障重合闸等。E-mail:lizainan@ncepu.edu.cn
贾科(1986—),男,通信作者,教授,主要研究方向:电力系统保护与控制、新型配电网故障定位与系统自我恢复。E-mail:ke.jia@ncepu.edu.cn
刘子奕(1999—),男,硕士研究生,主要研究方向:柔性直流系统故障特性分析及保护。E-mail:liu2632206616@163.com
收稿:2023-06-02,
修回:2023-08-12,
纸质出版:2023-12-10
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李再男,贾科,刘子奕等.半桥型MMC直流侧故障恢复过程过流机理及抑制方法[J].电力系统自动化,2023,47(23):180-188.
LI Zainan,JIA Ke,LIU Ziyi,et al.Overcurrent Mechanism and Suppression Method for DC-side Fault Recovery Process of Half-bridge Modular Multilevel Converter[J].Automation of Electric Power Systems,2023,47(23):180-188.
李再男,贾科,刘子奕等.半桥型MMC直流侧故障恢复过程过流机理及抑制方法[J].电力系统自动化,2023,47(23):180-188. DOI: 10.7500/AEPS20230602001.
LI Zainan,JIA Ke,LIU Ziyi,et al.Overcurrent Mechanism and Suppression Method for DC-side Fault Recovery Process of Half-bridge Modular Multilevel Converter[J].Automation of Electric Power Systems,2023,47(23):180-188. DOI: 10.7500/AEPS20230602001.
直流侧发生短路故障后,半桥型模块化多电平换流器(MMC)易闭锁,故障恢复期间不当解锁导致桥臂过流,MMC存在连续闭锁风险,引发系统性安全问题。针对该问题,文中理论分析了故障恢复期间绝缘栅双极型晶体管(IGBT)的解锁过流机理,并提出了一种新的故障恢复控制。首先,指出欠阻尼状态的故障回路必然导致IGBT闭锁。其次,揭示了故障恢复期间IGBT解锁过流的根源是直流侧和交流侧的压差。进一步,提出了故障恢复控制,在闭锁期间切除功率外环,抬高交流侧调制波以减少压差,抑制桥臂电流。计及闭锁期间子模块电容电压和重合闸时序,构建了自适应外环参考值曲线,解决功率盈余造成的过压问题。结果表明,和现有串联交流侧启动电阻方法相比,在不同工况下所提故障恢复控制最低可将桥臂电流峰值由1.57 p.u.降至0.79 p.u.,解锁后调控功率侧MMC直流电压为额定值,有助于加快故障恢复。
After a short-circuit fault occurs on the DC side
the half-bridge modular multilevel converter (MMC) is prone to block
and improper unblocking during fault recovery leads to overcurrent of the bridge arm
and MMC has the risk of continuous blocking
leading to systemic safety problem. To solve this problem
the unblocking overcurrent mechanism of insulated gate bipolar transistor (IGBT) during fault recovery is analyzed theoretically
and a new fault recovery control is proposed. Firstly
it is pointed out that the fault loop in the underdamped state will inevitably lead to IGBT blocking. Secondly
it is revealed that the source of IGBT unblocking overcurrent during fault recovery is the voltage difference between DC side and AC side. Further
a fault recovery control is proposed to remove the power outer loop during the blocking period
raise the AC-side modulation wave to reduce the pressure difference and suppress the current of the bridge arm. Taking into account the capacitor voltage and reclosing time of submodules during the blocking period
an adaptive outer loop reference value curve is constructed to solve the overvoltage problem caused by power surplus. The results show that compared with the existing series AC-side starting resistance method
the proposed fault recovery control can reduce the peak current of the bridge arm from 1.57 p.u. to 0.79 p.u. in different operation conditions
and adjust the power-side MMC DC voltage to the rated value after unblocking
which is helpful to speed up the fault recovery.
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