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1.浙江大学电气工程学院,浙江省杭州市 310027
2.国网浙江省电力有限公司电力科学研究院,浙江省杭州市 310014
Received:29 June 2020,
Revised:2020-10-30,
Published Online:15 January 2021,
Published:25 April 2021
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范世源,杨贺雅,杨欢等.具有故障穿越能力的T型桥臂交替多电平换流器及其调制策略[J].电力系统自动化,2021,45(8):41-50.
FAN Shiyuan,YANG Heya,YANG Huan,et al.T-type Alternate Arm Multilevel Converter with Fault Ride-through Capability and Its Modulation Strategy[J].Automation of Electric Power Systems,2021,45(8):41-50.
范世源,杨贺雅,杨欢等.具有故障穿越能力的T型桥臂交替多电平换流器及其调制策略[J].电力系统自动化,2021,45(8):41-50. DOI: 10.7500/AEPS20200629006.
FAN Shiyuan,YANG Heya,YANG Huan,et al.T-type Alternate Arm Multilevel Converter with Fault Ride-through Capability and Its Modulation Strategy[J].Automation of Electric Power Systems,2021,45(8):41-50. DOI: 10.7500/AEPS20200629006.
针对常规模块化多电平换流器(MMC)难以兼顾直流故障穿越能力与系统经济性的问题,提出一种T型桥臂交替多电平换流器(T-AAMC)及其调制策略,其直流桥臂采用半桥子模块并配合桥臂移相的新型调制策略,有效降低换流器建造成本与运行损耗,同时由全桥子模块串联组成的交流桥臂实现了直流故障穿越。首先
介绍了T-AAMC的拓扑结构,再基于各桥臂能量平衡条件,明确T-AAMC的桥臂移相调制策略,进而分析了T-AAMC的运行参数与硬件配置;同时,设计闭环控制系统,实现交直流桥臂能量的动态平衡;然后,将T-AAMC与现有的MMC进行了对比,相比于混合型MMC,T-AAMC在子模块数量、功率器件数量、电容取值上均实现了削减;最后,在MATLAB/Simulink中搭建仿真平台,验证了拓扑、调制与控制设计的有效性。所提T-AAMC在正常工况下能够实现宽范围、高效率的能量转换,同时具有直流故障穿越能力,可保障系统持续可靠运行。
The conventional modular multilevel converter (MMC) is difficult to balance the DC fault ride-through capability and the system economy. Aiming at this problem
this paper proposes a T-type alternate arm multilevel converter (AAMC) and its modulation strategy. With the proposed new arm phase-shift modulation strategy
the DC arm of T-AAMC can be constructed by half-bridge sub-modules
which reduces the construction cost and operation losses. Meanwhile
the DC fault ride-through capability is realized by the AC arm constructed with full-bridge submodules in series. First
the topology of T-AAMC are described. The arm phase-shift modulation strategy is determined according to the energy balance condition of each arm
and the operation parameters and hardware configuration of T-AAMC are analyzed. Then
the closed-loop control system is also designed to dynamically balance the energy in AC and DC arms. Furthermore
a comprehensive comparison between T-AAMC and the existing modular multilevel converters is demonstrated. It is shown that
compared with the hybrid MMC
the submodule number
power device number and submodule capacitance of T-AAMC are all reduced. Finally
the proposed topology
the modulation method and the control design are verified by the simulation in the MATLAB/Simulink environment. The proposed T-AAMC can realize the energy conversion with a wide operation range and high efficiency under the normal condition
and it has the DC fault ride-through capability to ensure continuous and reliable operation of the system.
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