Methods for Power Flow Calculation and Electro-mechanical Transient Modeling of LCC-MMC Hybrid Multi-terminal HVDC System

被引：0
|
作者：
Xiao L. [1 ]
Wang G. [1 ]
Xu Y. [1 ]
You G. [2 ]
Xu Z. [1 ]
机构：
[1] College of Electrical Engineering, Zhejiang University, Hangzhou
[2] Yunnan Grid Planning and Research Center, Yunnan Power Grid Co., Ltd., Kunming
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 08期
关键词：
Electro-mechanical model; Hybrid multi-terminal HVDC system; LCC; MMC; Power flow algorithm;
D O I：
10.13336/j.1003-6520.hve.20190731029
中图分类号：
学科分类号：
摘要：
To realize the transient stability calculation of large-scale AC/DC power systems including hybrid HVDC transmission systems, we proposed methods for power flow calculation and electro-mechanical transient modeling of line commutated converter-modular multilevel converter (LCC-MMC) based hybrid multi-terminal HVDC system. Firstly, the general idea of modeling the LCC-MMC hybrid multi-terminal HVDC system was analyzed, then the AC-side and DC-side equivalent circuits of the LCC/MMC were established. Different from the traditional DC-side equivalent circuit of MMC, the second-order differential equations describing the MMC DC-side circuit was used to construct the electro-mechanical transient model of the hybrid HVDC system. Besides, taking the firing angle limit of the LCC into account, we proposed a sequential power flow algorithm for a hybrid multi-terminal HVDC system. Finally, the power flow calculation and electro-mechanical simulation of the LCC-MMC hybrid HVDC system were implemented in electro-mechanical simulation platform PSS/E, and the model was applied to the case of China Southen Power Grid. The simulation and calculation results show that the proposed method can be used to ensure the reliability of system model initialization; and the step response characteristics of the electro-mechanical model and the detailed electromagnetic model are basically the same; the simulation in China Southen Power Grid embedded with Wudongde three-terminal hybrid HVDC system shows that, under the relatively serious three-phase short-circuit fault on the converter bus of the receiving-end system, the sending-end system can resume stable operation after the fault is cleared. Therefore, the power flow calculation and electro-mechanical transient modeling methods proposed in this paper can satisfy the transient stability calculation of large-scale AC/DC power systems. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：2578 / 2586
页数：8
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