Research on the Voltage Supporting Capability of Multi-VSC-HVDC Subsystems Operation Strategy to Receiving-end LCC-HVDC Network in Weak AC Grid

Li, Tao; Li, Yongli; Zhu, Yuchen

doi:10.30941/cestems.2023.00007

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…When the receiving end system is faulty, the fault current will lead to continuous commutation failure, resulting in transient overvoltage of the bus voltage at the DC end for several times, which threatens the safe operation of the system. Therefore, it is necessary to block the fault by blocking the fault through strategy [9] .…”

Section: The Blocking Fault Crossing Strategymentioning

confidence: 99%

Analysis of influence of energy storage system parameters on HVDC commutation failure overvoltage

Ge,

Wang,

Duan

et al. 2023

E3S Web Conf.

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Overvoltage is a common fault in high voltage direct current (HVDC) transmission systems, which directly affects the safe and stable operation of the system. Energy storage system has been widely used in power system because of its fast response speed, high precision and bidirectional energy transmission. As a variable parameter, the low voltage traverse active power coefficient directly affects the overvoltage of commutation failure in HVDC system. In this paper, the influence of transient characteristics and energy storage parameters on commutation failure overvoltage of energy storage system connected to HVDC is analyzed. Based on PSASP simulation, combined with the actual characteristic setting parameters of a power grid in northwest China, the positive correlation between energy storage low-pass active power and transient overvoltage of HVDC system commutating failure is verified by dynamic trajectory sensitivity analysis, and the optimization space of HVDC energy storage system is expanded.

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Section: The Blocking Fault Crossing Strategymentioning

confidence: 99%

Analysis of influence of energy storage system parameters on HVDC commutation failure overvoltage

Ge,

Wang,

Duan

et al. 2023

E3S Web Conf.

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“…Zhang et al (2011) synthesized voltage and current constraints and used space-vector theories to obtain the power operation point with the minimum voltage offset or the maximum output power. Li et al (2023) investigated the influence of LCC-HVDC on the steady-state operation area of VSC-HVDC under different control modes and AC system intensities. Zhao et al (2023) analyzed the key factors affecting the power quality and safety of the system and proposed a calculation method for the steady-state operation area of the system.…”

Section: Introductionmentioning

confidence: 99%

Stable operating limits and improvement methods for hydropower and photovoltaic integration through MMC-HVDC systems

Peng,

Feng,

Zhang

et al. 2024

Front.Electron.

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This paper addresses the critical need to determine the stable operating limit of modular multilevel converter-based high voltage direct current (MMC-HVDC) systems, particularly concerning the integration of extensive renewable energy sources. To achieve this, the steady-state mathematical model and state-space model of bundled hydropower and photovoltaic integration through MMC-HVDC systems are established. A novel methodology considering steady-state and small-signal stability constraints is proposed to compute the stable operating region of the system. The quantitative assessment reveals that diminishing AC system short-circuit capacities amplify restrictions from small-signal stability constraints, thereby reducing the system's stable operating region. Eigenvalue and participation factor analyses shed light on the pivotal factors affecting small-signal stability in weak AC systems. To expand the system's stable operating region, a supplementary frequency damping control strategy is proposed. The theoretical analysis and calculation results are validated by building a simulation model for the bundled hydropower and photovoltaic integration through MMC-HVDC systems in PSCAD/EMTDC.

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“…However, similar to traditional STATCOM, during the voltage support process, as the grid-side fault is cleared, the grid-side voltage rises rapidly, and STATCOM/BESS also has PI control lag, which leads to excessive reactive power output and abnormal voltage increase, exacerbating voltage oscillation and affecting grid-side voltage stability. Reference [12] proposes a control strategy that switches between PI control and sliding mode control to improve the system's voltage stability, but the calculation of the sliding mode surface is relatively complicated. This article proposes a simple and effective outer-loop control switching strategy.…”

Section: Introductionmentioning

confidence: 99%

An optimized control switching strategy for STATCOM/BESS reactive power output

Wu,

Zhao,

et al. 2023

International Conference on Automation Control, Algorithm, and Intelligent Bionics (ACAIB 2023)

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In recent years, STATCOM/BESS (Static Synchronous Compensator/Battery Energy Storage System) has received widespread attention due to its superior power four-quadrant output characteristics. To address the problem of delayed reactive power withdrawal and voltage fluctuations in compensating traditional DC transmission under large disturbances, a fast and effective outer-loop control switching strategy has been proposed. Under small disturbances, a constant bus voltage control method based on PI control is adopted to provide real-time and complete compensation of the receiving end voltage, maintaining the receiving-end bus voltage at the rated value. Under large disturbances, the control mode is switched to open-loop control with constant reactive power, without the delay of the PI loop, enabling timely withdrawal of reactive power upon fault clearance and ensuring stable receiving-end voltage. The proposed control strategy was verified by simulation on the PSCAD/EMTDC platform, demonstrating its feasibility and effectiveness.

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Research on the Voltage Supporting Capability of Multi-VSC-HVDC Subsystems Operation Strategy to Receiving-end LCC-HVDC Network in Weak AC Grid

Cited by 13 publications

References 19 publications

Analysis of influence of energy storage system parameters on HVDC commutation failure overvoltage

Analysis of influence of energy storage system parameters on HVDC commutation failure overvoltage

Stable operating limits and improvement methods for hydropower and photovoltaic integration through MMC-HVDC systems

An optimized control switching strategy for STATCOM/BESS reactive power output

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