Advanced Scheme for AC Voltage Control at HVDC Converter Terminals

Hammad, A. E.; Sadek, K.; Koelsch, H.; Gueth, G.

doi:10.1109/tpas.1985.319006

Cited by 29 publications

(5 citation statements)

References 3 publications

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“…3. The most common control mode for LCC inverter is a constant DC voltage (CV) control and the DC voltage of the LCC inverter is obtained as follows [2], [6]:…”

Section: Operating Point Of Hybrid Multi-terminal Hvdc Systemmentioning

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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“…3. The most common control mode for LCC inverter is a constant DC voltage (CV) control and the DC voltage of the LCC inverter is obtained as follows [2], [6]:…”

Section: Operating Point Of Hybrid Multi-terminal Hvdc Systemmentioning

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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“…The transmission distance is about 1373 km. The power gird nearby Qingdao converter substation is shown in Figure 3: The characteristics of dynamic self-adaptive VDCOL are set to coincide with conventional VDCOL when V ac equals to 0.9 p.u.. CON is 1.7 by substituting V H to equation (1). Load Models.…”

Section: Sample System Studiesmentioning

confidence: 99%

“…DC converters inherently absorb a large mount of reactive power during commutation. In recent years, many voltage instability incidents have occurred in AC/DC hybrid power grids around the world and more and more attentions are paid to improve voltage stability [1]- [4].…”

Section: Introductionmentioning

confidence: 99%

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New VDCOL Control Strategy for Voltage Stability in Receiving-End Power Grid of DC System

Liu

2012

AMR

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Voltage stability of AC/DC hybrid power grid is closely related to Voltage Dependent Current Order Limiter (VDCOL). The effects of VDCOL to voltage stability along with serious voltage reduction during or after faults are analyzed in detail. Considering that VDCOL with fixed parameters is difficult to adapt the complexity of operation conditions and ac faults in the receiving-end power grid of dc system, a kind of dynamic self-adaptive VDCOL control strategy is proposed based on the voltage of ac side of converter transformers at inverter side. Simulations of Shandong power grid of China show that the new type of VDCOL is beneficial to voltage stability of receiving-end power grid.

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“…Therefore, AC voltage restores sufficiently and AC system collapse is prevented. References for this kind of control can be found in [76,[121][122][123][124][125][126][127][128][129][130][131]. Among them, coordinated modulation of active power and reactive power control through firing angle control is proposed in [126].…”

Section: Hvdc Reactive Power Controlmentioning

confidence: 99%

Advanced nonlinear control of complex power systems

Li¹

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Advanced Scheme for AC Voltage Control at HVDC Converter Terminals

Cited by 29 publications

References 3 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

New VDCOL Control Strategy for Voltage Stability in Receiving-End Power Grid of DC System

Advanced nonlinear control of complex power systems

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