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电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市 250061
Received:06 February 2023,
Revised:2023-06-05,
Published Online:25 August 2023,
Published:10 October 2023
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郭猛,郝全睿,李东.混合型MMC的改进桥臂平均值与状态空间模型[J].电力系统自动化,2023,47(19):116-127.
GUO Meng,HAO Quanrui,LI Dong.Improved Arm Average and State-space Models of Hybrid Modular Multilevel Converter[J].Automation of Electric Power Systems,2023,47(19):116-127.
郭猛,郝全睿,李东.混合型MMC的改进桥臂平均值与状态空间模型[J].电力系统自动化,2023,47(19):116-127. DOI: 10.7500/AEPS20230206002.
GUO Meng,HAO Quanrui,LI Dong.Improved Arm Average and State-space Models of Hybrid Modular Multilevel Converter[J].Automation of Electric Power Systems,2023,47(19):116-127. DOI: 10.7500/AEPS20230206002.
混合型模块化多电平换流器(MMC)包含半桥与全桥子模块是MMC的通用形式。混合型MMC的常规桥臂平均值模型将半桥与全桥子模块动态视为一致,未考虑两者电容电压可能存在的差异,不能精确描述混合型MMC的动态特性。文中首先考虑半桥与全桥子模块动态特性差异,构建等效电路;其次,提出模拟桥臂调制信号在全桥与半桥子模块间非线性分配的算法,与等效电路共同组成混合型MMC改进桥臂平均值模型。在此基础上,考虑半桥与全桥子模块电气量高次谐波,推导混合型MMC电气部分在
dq
同步坐标系下的微分动态方程;基于桥臂参考电压非线性分配算法和分段求解方法,推导半桥和全桥子模块等效参考电压解析表达式;建立混合型MMC在
dq
同步坐标系中的模块化状态空间模型。最后,以测试系统为例,在PSCAD和Simulink中对比详细开关模型与所提模型的暂稳态波形,验证了所提建模方法的有效性和准确性。
The hybrid modular multilevel converter (MMC) is the general form of MMC
which consists of the half-bridge sub-module (HBSM) and the full-bridge sub-module (FBSM). The conventional arm average model (AAVM) of hybrid MMC regards the dynamics of HBSM and FBSM as the same
which does not take into account the difference in capacitor voltage between the two sub-modules. So
it cannot describe the dynamics of hybrid MMC accurately. Firstly
considering the difference in dynamic characteristics between HBSM and FBSM
this paper constructs the equivalent circuit. Secondly
an algorithm that simulates the nonlinear distribution of the arm modulation signal between HBSM and FBSM is proposed. The equivalent circuit and the algorithm constitute the improved AAVM of hybrid MMC. On this basis
considering the high-order harmonics of the electrical variables of HBSM and FBSM
the differential dynamic equation of the electrical part of the hybrid MMC in the
dq
synchronous coordinate system is derived. Based on the nonlinear distribution algorithm of the arm voltage reference and the piecewise solution method
the analytical expressions of equivalent voltage references of HBSM and FBSM are derived. A modular state-space model of hybrid MMC in the
dq
synchronous coordinate system is established. Finally
taking the test system as an example
the transient and steady-state waveforms of the detailed switching model and the proposed model are compared in PSCAD and Simulink to verify the effectiveness and correctness of the proposed modeling method.
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