Frequency control at the power sending side for large-scale HVDC asynchronous interconnection between Yunnan power grid and the rest of CSG

Rao, Hong; Wu, Wei; Mao, Tian; Zhou, Baorong; Chen, Hong; Liu, Yongjun; Wu, Xuegang

doi:10.17775/cseejpes.2020.00080

Cited by 13 publications

(6 citation statements)

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“…The frequency deviation of thermal power plant A in the sending-end AC system is the output. Furthermore, the transfer function of the system's lower order linearized model can be identified in Equation (8) according to Figure 5.…”

Section: Identification Of Island Simulation Modelsmentioning

confidence: 99%

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LCC-HVDC Frequency Robust Control Strategy Based on System Parameter Identification in Islanded Operation Mode

Xing,

Liu,

Peng

et al. 2024

Electronics

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To enhance the stability of the frequency at the sending terminal of the HVDC island during operation, a novel DC supplemental frequency robust controller is proposed in this paper. The proposed controller utilizes the fast controllability of a DC power supply to maintain system frequency stability. The identification of a low-order linearized model of the system can be obtained from a high-precision Prony algorithm based on the second derivative method (SDM). Subsequently, utilizing a robust design methodology based on linear matrix inequalities, an additional frequency robust controller is devised, striking a balance between optimal performance and robustness. This supplementary frequency robust controller exhibits a straightforward control structure with a modest order, making it readily implementable. Simulation experiments conducted within the PSCAD/EMTDC framework substantiate that the designed supplemental frequency robust controller significantly enhances the frequency stability of the sending terminal system. Furthermore, when compared with traditional proportional integral (PI) controllers, it demonstrates superior control efficacy and robustness against various types of faults under different operational modes. Even in interconnected operational modes, it continues to operate effectively. The research findings offer valuable insights for practical applications in islanded power systems.

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Section: Identification Of Island Simulation Modelsmentioning

confidence: 99%

“…In [8], it is elucidated that frequency limitation control (FLC) holds profound significance in the realm of frequency regulation for extensive HVDC asynchronous interconnected power grids. It is pointed out that FLC can quickly reduce the unbalanced power 1.…”

Section: Introductionmentioning

confidence: 99%

LCC-HVDC Frequency Robust Control Strategy Based on System Parameter Identification in Islanded Operation Mode

Xing,

Liu,

Peng

et al. 2024

Electronics

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“…Each DC line contains seven equations of Equation (1), and the variables to be solved are also seven. Adjusting the control angle on both sides belongs to the fast control, and the adjustment of the transformer tap belongs to the slow control.…”

Section: Transmission System Modelmentioning

confidence: 99%

“…With a large number of highvoltage direct current transmission (HVDC) connected to the power grid, it gradually evolved into the pattern of multi-dc interconnected asynchronous power grid, which reduces the standby capacity and frequency adjustment ability of regional power grids, and the problem of system frequency stability will become more significant. Especially after a DC blocking accident [1], the large disturbance power will lead to increased frequency deviation, which seriously endangers system operation safety.…”

Section: Introductionmentioning

confidence: 99%

Fast Evaluation Method for Steady State Frequency of Multi-DC Interconnected Asynchronous Power Grid after DC Blocking

Wang,

Xu,

et al. 2023

J. Phys.: Conf. Ser.

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For a multi-DC interconnected asynchronous power grid, to quickly evaluate the steady-state frequency after DC blocking, a fast evaluation method is proposed in this paper. Firstly, the power flow model was established, including the DC transmission system, each interconnected asynchronous power grid model. The steady-state operation state before DC blocking was solved. Secondly, considering the adjustment of the model after DC blocking, the steady-state frequency analysis model considering the effects of primary frequency regulation and various stability control strategies was established. Finally, a case study was used to confirm the effectiveness of the proposed method. The simulation results and analysis show that the proposed method is fast and accurate.

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“…H VDC Transmission has the advantages of large transmission capacity, long transmission distance, high efficiency, etc. It is widely used in long-distance large-capacity power transmission and interconnected power grids and other occasions [1]- [5]. From the perspective of conversion principle, HVDC transmission includes Line Commutated Converter based High Voltage Direct Current transmission (LCC-HVDC) and Voltage Sourced Converter based HVDC (VSC-HVDC) [6].…”

Section: Introductionmentioning

confidence: 99%

The On-site Verification of Key Technologies for Kunbei-Liuzhou-Longmen Hybrid Multi-terminal Ultra HVDC Project

2022

CSEE JPES

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Frequency control at the power sending side for large-scale HVDC asynchronous interconnection between Yunnan power grid and the rest of CSG

Cited by 13 publications

References 0 publications

LCC-HVDC Frequency Robust Control Strategy Based on System Parameter Identification in Islanded Operation Mode

LCC-HVDC Frequency Robust Control Strategy Based on System Parameter Identification in Islanded Operation Mode

Fast Evaluation Method for Steady State Frequency of Multi-DC Interconnected Asynchronous Power Grid after DC Blocking

The On-site Verification of Key Technologies for Kunbei-Liuzhou-Longmen Hybrid Multi-terminal Ultra HVDC Project

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