Electro-mechanical transient modeling of MMC based multi-terminal HVDC system with DC faults considered

Liang, Xiao; Xiao, Huangqing; Zhang, Zheren; Wang, Guoteng; Xu, Zheng

doi:10.1016/j.ijepes.2019.06.003

Cited by 18 publications

(20 citation statements)

References 30 publications

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“…However, the DC voltage variation of the receiving end LCC is very small, which indicates that the DC voltage coupling degree between the LCC and the MMC is low. This conclusion can also be verified by analyzing the influencing factors of the interface models (14) and (15).…”

Section: Dynamic Analysis Of the 39-bus System With A Decentralized Hmentioning

confidence: 60%

“…By solving (8), (10), (11), and (13), the DC voltage expression of the receiving end LCC and the MMCB can be obtained as (14) and (15). Equations (12), (14), and (15) form the interface model of the LCC-MMC cascaded inverter station in Figure 6.…”

Section: Interface Model Among Lcc and Mmcsmentioning

confidence: 99%

“…Xiao et al [9] proposed an electromechanical transient model of the LCC-MMC hybrid HVDC system, but all converters in a station can only be connected to one AC bus. The electromechanical transient model of a multi-terminal HVDC system is established in [14], but it is not applicable to the LCC-MMC hybrid HVDC system. Chang et al [15] proposed a novel LCC-MMC hybrid HVDC system model for offshore wind farms.…”

Section: Introductionmentioning

confidence: 99%

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Electromechanical Transient Modeling and Control Strategy of Decentralized Hybrid HVDC Systems

et al. 2019

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This paper studies the electromechanical transient model and the control strategy of line commutated converter (LCC) and modular multilevel converter (MMC) based decentralized hybrid High Voltage Direct Current (HVDC) Transmission systems. The decentralized hybrid HVDC system is a new type of topology, and the related electromechanical transient model and control strategy have not been studied well. In this paper, the electromechanical transient model of a decentralized hybrid HVDC system is devloped through mathematical deduction. This model can be easily implemented in electromechanical transient simulation software and meet the time domain simulation requirements of large-scale systems. Then, in order to ensure the safe absorption of the DC power under various conditions, an optimal power flow model considering the decentralized hybrid HVDC system is proposed. Finally, the electromechanical transient model proposed in this paper is verified by the electromagnetic transient model, and the control strategy is validated in a modified New England 39-bus system.

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Section: Dynamic Analysis Of the 39-bus System With A Decentralized Hmentioning

confidence: 60%

Section: Interface Model Among Lcc and Mmcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromechanical Transient Modeling and Control Strategy of Decentralized Hybrid HVDC Systems

et al. 2019

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“…For the active power controller, the small-signal model is outlined as (25), where M iPg , K iPg , and K pPg are the state variable of the integral part, the proportional gain, and the integral gain of the outer controller. (25) For the reactive power controller, the small-signal model is outlined as (26), where M iQg , K iQg , and K pQg are the state variable of the integral part, the proportional gain, and the integral gain of the outer controller.…”

Section: Small-signal Model Of Outer Controllermentioning

confidence: 99%

“…To give general conclusions, the actual value and the nominalized value of the main parameters in the test system are listed in Table 1. The parameters in Table 1 approximate the two-terminal test system in [26]. For the voltages at the secondary side of the converter transformer, the base value is chosen as the rated voltage of the transformer secondary side; at the transformer primary side, the voltage base value is selected as the rated voltage at this side.…”

Section: System Parametersmentioning

confidence: 99%

Minimum Short Circuit Ratio Requirement for MMC-HVDC Systems Based on Small-Signal Stability Analysis

et al. 2019

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This paper determines the minimum short circuit ratio (SCR) requirement for a modular multilevel converter based high-voltage direct current (MMC-HVDC) transmission systems. Firstly, a simplified model of MMC is introduced; the MMC is represented by its AC and DC side equivalent circuit. Next, by linearizing the MMC subsystem and the DC network subsystem, the deduction of the small-signal models of MMC subsystem, the small-signal model of the DC network and MMC-HVDC are carried out successively. Thirdly, the procedure for determining the minimum SCR requirement of MMC-HVDC is described. Finally, case studies are performed on a two-terminal MMC-HVDC system under four typical control schemes. The results show that the restraint factors for the rectifier MMC is predominantly the voltage safety limit constraint, and the restraint factors for the inverter MMC are mainly the phase locked loop (PLL) or the outer reactive power controller. It is suggested that the minimum SCR requirement for the sending and the receiving systems should be 2.0 and 1.5 in the planning stage.

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Modeling and simulation of large power system with inclusion of bipolar MTDC grid

Gao

et al. 2020

International Journal of Electrical Power & Energy Systems

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Electro-mechanical transient modeling of MMC based multi-terminal HVDC system with DC faults considered

Cited by 18 publications

References 30 publications

Electromechanical Transient Modeling and Control Strategy of Decentralized Hybrid HVDC Systems

Electromechanical Transient Modeling and Control Strategy of Decentralized Hybrid HVDC Systems

Minimum Short Circuit Ratio Requirement for MMC-HVDC Systems Based on Small-Signal Stability Analysis

Modeling and simulation of large power system with inclusion of bipolar MTDC grid

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