A Coordinated DC Power Support Strategy for Multi-Infeed HVDC Systems

Zhang, Chunlei; Chu, Xiaodong; Zhang, Bing; Ma, Lei; Li, Xin; Wang, Xiaobo; Wang, Liang; Wu, Cheng

doi:10.3390/en11071637

Cited by 5 publications

(6 citation statements)

References 29 publications

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“…A coordinated operation is developed among multiple HVDC lines called multi-infeed systems to improve the transmission capacity and system stability [9]- [12], [15], [16], [31], [32]. Recently, several utilities have carried out preliminary technical investigations to upgrade coseffectively upgrade and exploit existing LCC HVDC systems, by tapping a new MMC station onto the LCC HVDC system, which is called a hybrid MTDC system [33]- [39].…”

Section: Introductionmentioning

confidence: 99%

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

et al. 2020

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This paper presents a control strategy for a modular multilevel converter (MMC) to prevent commutation failure of a line-commutated converter (LCC), forming a three-terminal hybrid HVDC transmission system, where one LCC sending end is connected to the large generation and two receiving ends (LCC inverter and MMC) are located near the load center. This configuration, one of the potential options, has been proposed to strengthen Korea electric power transmission system through the optimized use of existing assets and rights-of-way, extremely challenging to secure. The MMC power control strategy has been developed to regulate the AC voltage and the extinction angle of the LCC inverter. This indirect yet effective active and reactive power control of the LCC inverter terminal helps prevent the commutation failure (CF) of the LCC in emergency and maximize the benefits of the costly planning option. By establishing a theoretical foundation for this power control problem and relationship among the control parameters, we quantify the active power reference for MMC to secure the desired LCC extinction angle. A coordinated strategy has been developed for the AC filter, the on-load tap changer of a transformer, along with the MMC control to lower the risk of CF and its catastrophic impact on the whole power system. The validity and performance of the proposed control methods are demonstrated for the real Korea electric power planning cases using a real-time power system simulator. INDEX TERMS Commutation failure, extinction angle, gamma-kick, hybrid multi-terminal HVDC system, weak AC system.

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Section: Introductionmentioning

confidence: 99%

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

et al. 2020

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“…Subsequently, considering that large disturbances can affect the power angle, voltage, and frequency simultaneously, the authors of [30] constructed an LS optimization model considering multiple security constraints, including transient voltage deviation security, transient frequency deviation security, and transient angle stability, which can remedy the limitation of single security constraint-based methods. In addition to LS, other control resources, such as HVDCs [31,32] and pumped storages [33], can also be used for emergency control. However, their control amount is usually determined separately [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Security Assessment and Coordinated Emergency Control Strategy for Power Systems with Multi-Infeed HVDCs

Zhang¹,

Zheng²,

Wang³

et al. 2020

Energies

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Short-circuit faults in a receiving-end power system can lead to blocking events of the feed-in high-voltage direct-current (HVDC) systems, which may further result in system instability. However, security assessment methods based on the transient stability (TS) simulation can hardly catch the fault propagation phenomena between AC and DC subsystems. Moreover, effective emergency control strategies are needed to prevent such undesired cascading events. This paper focuses on power systems with multi-infeed HVDCs. An on-line security assessment method based on the electromagnetic transient (EMT)-TS hybrid simulation is proposed. DC and AC subsystems are modeled in EMTDC/PSCAD and PSS/E, respectively. In this way, interactions between AC and DC subsystems can be well reflected. Meanwhile, high computational efficiency is maintained for the on-line application. In addition, an emergency control strategy is developed, which coordinates multiple control resources, including HVDCs, pumped storages, and interruptible loads, to maintain the security and stability of the receiving-end system. The effectiveness of the proposed methods is verified by numerical simulations on two actual power systems in China. The simulation results indicate that the EMT-TS hybrid simulation can accurately reflect the fault propagation phenomena between AC and DC subsystems, and the coordinated emergency control strategy can work effectively to maintain the security and stability of systems.

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“…The synchronous condenser (SC) is a traditional dynamic reactive power compensation device, in addition, it can increase the short-circuit ratio (SCR) and provide the rotational inertia [6,7]. The SC is substantially a synchronous machine without any mechanical load or prime mover [8].…”

Section: Introductionmentioning

confidence: 99%

Synchronous Condenser’s Loss of Excitation and Its Impact on the Performance of UHVDC

Guo

et al. 2020

Energies

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The synchronous condenser (SC) has a broad application prospect in ultra-high-voltage direct current (UHVDC) systems. The SC’s loss of excitation (LOE) is an important grid-related fault that may cause damage to the UHVDC. However, as the premise of the scientific protection configuration, knowledge of the SC’s LOE feature and its impact on UHVDC is still missing. This article first analyzes the SC’s LOE feature, offering a basic cognition of this fault. Secondly, the LOE SC’s reactive power response to system voltage variation is studied in the single-machine infinite-bus system. This lends a foundation for transient UHVDC research. Finally, the LOE SC’s impacts on steady and transient UHVDC are evaluated, respectively, considering different AC strengths and system faults through PSCAD/EMTDC (V4.6, Manitoba HVDC Research Center, Winnipeg, MB, Canada) simulations. The results show that: (1) LOE the SC absorbs reactive power while maintaining synchronous operation, its excitation current declines monotonically; (2) the LOE SC has an insignificant effect on steady-state UHVDC; (3) the LOE SC can restrain the overvoltage and benefit the rectifier’s transient stability; and (4) to reduce the inverter’s commutation failure, keeping LOE SC is more effective than separating it beforehand, while separating the LOE SC after the system voltage drop performs best. These conclusions could provide insights for the protection’s criterion and operation mode selections.

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A Coordinated DC Power Support Strategy for Multi-Infeed HVDC Systems

Cited by 5 publications

References 29 publications

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

Security Assessment and Coordinated Emergency Control Strategy for Power Systems with Multi-Infeed HVDCs

Synchronous Condenser’s Loss of Excitation and Its Impact on the Performance of UHVDC

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