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东北电力大学电气工程学院,吉林省吉林市 132001
Received:14 July 2020,
Revised:2020-09-29,
Published Online:30 January 2021,
Published:25 April 2021
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林霖,裴忠晨,蔡国伟等.基于电力电子变压器的中压直流互联配电网协调控制方法[J].电力系统自动化,2021,45(8):51-59.
LIN Lin,PEI Zhongchen,CAI Guowei,et al.Coordinated Control Method for Medium-voltage DC Interconnected Distribution Network Based on Power Electronic Transformer[J].Automation of Electric Power Systems,2021,45(8):51-59.
林霖,裴忠晨,蔡国伟等.基于电力电子变压器的中压直流互联配电网协调控制方法[J].电力系统自动化,2021,45(8):51-59. DOI: 10.7500/AEPS20200714012.
LIN Lin,PEI Zhongchen,CAI Guowei,et al.Coordinated Control Method for Medium-voltage DC Interconnected Distribution Network Based on Power Electronic Transformer[J].Automation of Electric Power Systems,2021,45(8):51-59. DOI: 10.7500/AEPS20200714012.
多端口电力电子变压器(PET)作为柔性互联配电网关键装备,其端口解耦控制与区域协调控制是保证跨区域互联系统安全稳定运行的关键技术之一。文中以基于隔离型模块化多电平变换器(I-M
2
C)的多端口PET作为关键装备提出一种依靠中压直流(MVDC)馈线互联的柔性配电网架构。首先,分析基于MVDC馈线跨区域互联配电网方案的技术特点,建立基于双调制自由度的 I-M
2
C型PET端口数学模型。然后,根据端口数学模型及不同稳态运行模式需求提出各端口基于双调制自由度的解耦控制方法。同时,介绍了跨区域互联模式下区域间主从控制策略,总结了柔性配电网在各工况下的运行模式。最后,通过MATLAB/Simulink搭建了10 kV仿真系统模型,验证了MVDC互联的柔性配电网协调控制策略的有效性与可行性。
Multi-port power electronic transformer (PET) is the key equipment for the flexible interconnected distribution network. Its decoupling control of ports and coordinated control between regions are the main technologies to ensure the safe and stable operation of the cross-regional interconnection system. This paper uses the isolated modular multilevel converter (I-M
2
C) based multi-port PET as the key equipment to propose a structure of flexible distribution network interconnected by medium-voltage DC (MVDC) feeders. First
the technical characteristics of the scheme for the cross-regional interconnected distribution network based on the MVDC feeders are analyzed. A mathematical model of ports in I-M
2
C based PET based on the dual-modulation freedom is established. Then
according to the mathematical model of ports and the requirements of different steady-state operation modes
a decoupling control method based on the dual-modulation freedom for each port is proposed. At the same time
the master-slave control strategy between regions in the cross-regional interconnection mode is introduced. Operation modes of the flexible distribution network under various working conditions are summarized. Finally
a 10 kV simulation model is built in MATLAB/Simulink
which verifies the effectiveness and feasibility of the coordinated control strategy for the MVDC interconnected flexible distribution network.
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