Coordinated Sending-End Power System Frequency Regulation via UHVDC

Shi, Qiaoming; Liu, Hongqing; Li, Kai; Yong-ping, Wang; Qingwu, Zhang; Li, Haiying; Zou, Qiang

doi:10.3390/electronics10161909

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…The high voltage direct current (HVDC) transmission has the advantages of large transmission capacity, long transmission distance, and high regulation capability, which are well suited for long-distance transmission of renewable energy generation systems (Alassi et al, 2019;Shi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

RPC-based frequency control strategy of LCC-HVDC sending end power system with renewable energy

Wei

Chai²,

Shi

et al. 2022

Front. Energy Res.

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Long-distance transmission of renewable energy via DC is currently a more economical transmission scheme. As the proportion of renewable energy at the generation end continues to rise, the inertia and damping level of the system is reduced, causing serious frequency-related issues. This paper first analyzes the working principle and control method of the LCC-HVDC system, summarizes the frequency control methods of the sending end power grid and their existing problems, and proposes a frequency control scheme for the LCC-HVDC sending end system based on the concept of rapid power compensation (RPC). Finally, the LCC-HVDC system model integrated with the large-capacity wind farm and thermal power plant is built in MATLAB/Simulink. Under conditions of load power fluctuation and sudden wind speed change, the proposed strategy fully utilizes the spare capacity of the system, effectively improves the frequency indexes of the system, and improves the frequency characteristics of the renewable energy sending end grid.

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Section: Introductionmentioning

confidence: 99%

RPC-based frequency control strategy of LCC-HVDC sending end power system with renewable energy

Wei

Chai²,

Shi

et al. 2022

Front. Energy Res.

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“…However, owing to the limitation on the rotor speed, the provided frequency support ability is weak, and if too much of the rotor kinetic energy is released, serious stability accidents can occur. Some scholars have also adjusted the transmission power of the back-to-back interconnected system to achieve an active frequency response by means of the direct current (DC) feeding [ 10 ]. The results of these studies showed that the active frequency response control approach is mainly applicable to wide-area and/or cross-regional large-scale systems with obvious spatiotemporal distribution of the frequency, and the DC modulation effect between regions is weakened under the zero-sum game.…”

Section: Introductionmentioning

confidence: 99%

An adaptive under-frequency optimal control strategy for power system combined pumped storage and under-frequency load shedding

Huang

Yuan

et al. 2021

PLoS ONE

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With the construction and development of ultra-high voltage (UHV) power grids, large-scale, long-distance power transmission has become common. A failure of the connecting line between the sending-end power grid and the receiving-end power grid will cause a large-scale power shortage and a frequency drop in the receiving-end power grid, which can result in the frequency collapse. Presently, under-frequency load shedding (UFLS) is adopted for solving the frequency control problem in emergency under-frequency conditions, which can easily cause large load losses. In this context, a frequency coordination optimal control strategy is proposed, which combines the mode transition of pumped storage units with UFLS to deal with emergency under-frequency problems. First, a mathematical model of the frequency dynamic response is established, which combines the mode transition of pumped storage units with UFLS based on a single-machine equivalent model. Then, an optimal model of the minimal area of the power system’s operation frequency trajectory is introduced, yielding the optimal frequency trajectory, and is used for obtaining the action frequency of the joint control strategy. A simulated annealing algorithm based on the perturbation analysis is proposed for solving the optimal model, and the optimal action frequency is obtained that satisfies the transient frequency offset safety constraint of the power system. Thus, the joint optimal control of the mode transition of the pumped storage units and UFLS is realized. Finally, the EPRI-36 bus system and China’s actual power grid are considered, for demonstrating the efficiency of the proposed strategy.

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A survey of challenges and potential of implementing a resilient network for Pakistan's electric power infrastructure to avoid blackouts

Ahmed,

Adnan,

Iqbal

et al. 2024

Results in Engineering

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Coordinated Sending-End Power System Frequency Regulation via UHVDC

Cited by 6 publications

References 29 publications

RPC-based frequency control strategy of LCC-HVDC sending end power system with renewable energy

RPC-based frequency control strategy of LCC-HVDC sending end power system with renewable energy

An adaptive under-frequency optimal control strategy for power system combined pumped storage and under-frequency load shedding

A survey of challenges and potential of implementing a resilient network for Pakistan's electric power infrastructure to avoid blackouts

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