Coordinated Control of Reactive Power between STATCOMs and Wind Farms for PCC Voltage Regulation

Nguyễn, Thanh Hải; Lee, Dong-Choon; Van, Tan Luong; Kang, Jong-Ho

doi:10.6113/jpe.2013.13.5.909

Cited by 21 publications

(7 citation statements)

References 24 publications

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“…These systems can have negative effects on power quality, such as phase imbalances, low power factor and harmonic distortion. Because the power quality problems adversely affect other electric facilities sharing the same line with these systems that cause power quality problems, technology is needed to improve power quality and stabilize the complex power system by eliminating these issues [1][2][3][4][5][6]. The flexible AC transmission system (FACTS) is a representative technology for improving power quality.…”

Section: Introductionmentioning

confidence: 99%

Zero-Sequence Voltage Injection Method for DC Capacitor Voltage Balancing of Wye-Connected CHB Converter under Unbalanced Grid and Load Conditions

2021

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Leg capacitor energy balancing control is one of the crucial issues for stable operation of a cascaded H-bridge (CHB) converter. Because this topology inherently consists of numerous submodule cells with DC capacitors, the cell voltages and leg capacitor energy instantaneously fluctuate depending on operation sequence of the CHB converter. In general, a wye-connected CHB-converter-based static synchronous compensator (STATCOM) utilizes a zero-sequence voltage component for leg capacitor energy balancing. In this paper, to improve the dynamics of leg energy balancing control, a feedforward calculation method of the zero-sequence voltage injection is proposed. The feedforward term can be instantaneously calculated by using the information from the measured leg voltages and leg currents, and the method ensures successful regulation of the leg energy balance even under unbalanced grid and load conditions. Moreover, the verification of the proposed method is supported by the mathematical vector theorems. A 50MVA full-scale wye-connected CHB–STATCOM system simulation was performed to verify the proposed feedforward calculation method considering unbalanced grid as well as unbalanced load conditions.

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Section: Introductionmentioning

confidence: 99%

Zero-Sequence Voltage Injection Method for DC Capacitor Voltage Balancing of Wye-Connected CHB Converter under Unbalanced Grid and Load Conditions

2021

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“…The reactive power reference generated through the WPP controller is allocated to the wind turbines constituting the WPP. Methods of allocating reactive power references to wind turbines include a method of allocating equally to each turbine, and a method of allocating through optimization considering the internal network and transformer losses, layout of the WPP, and turbine location [14][15][16][17].…”

Section: Reactive Power Control With Wind Power Plantmentioning

confidence: 99%

Coordinated Reactive Power Control with a Variable Shunt Reactor and an Inverter-Based Wind Power Plant

Song

Kim

2022

Energies

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Underground or submarine cables have a higher capacitance component than overhead lines, and they inject a large amount of capacitive reactive power into the system. A separate reactive power compensation device is required in order for a wind power plant (WPP) connected to the public network with a cable to meet the reactive power requirements required by the grid code. In this paper, a reactive power control using a variable shunt reactor (VSR) was proposed to satisfy the reactive power requirement required by the grid code for a WPP connected to the grid through a cable. The proposed reactive power control method compensates for the capacitive reactive power of the cable by using a VSR, and it follows the reactive power command through the reactive power control of a WPP. In the section where it is difficult to follow the WPP reactive power command only with the reactive power capacity of a WPP due to cable losses or a cable reactive power compensation error of the VSR, the reactive power control is additionally supported through the hysteresis control of the VSR. The proposed method satisfies the grid codes, and it enables fast and accurate reactive power control. The performance of the proposed method was verified through simulation using MATLAB/Simulink.

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“…The fuzzy Interference system is used to achieve fast dynamic response, no overshoot and reduction of settling time is achieved to maintain the constant DC voltage [10]. In [11] studied the injection of negative sequence current for reducing the unbalanced voltage at the point of PCC. The rotor currents are decoupled in to direct component and quadrature component for regulating active and reactive power using PI Controllers [12][13].…”

Section: Introductionmentioning

confidence: 99%

Integrated Controller for Elimination of Harmonics in PMSG Based WECS Feeding Non Linear Load

Mayakrishnan¹,

Srinivasan²,

Loganathan³

2017

IJIES

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This paper presents a simple and robust fuzzy logic with Adaptive linear Neuron (Adaline) controller. It is used for controlling the Direct driven Permanent Magnet Synchronous Generator (D-PMSG) based Wind Energy Conversion System(WECS) supplying three phase loads. In practice the loads are non-linear in nature and therefore harmonics are injected in to the generating system. By this PMSG is affected by these harmonics and leads to poor voltage regulation and requires adjustable reactive power source. The fuzzy logic is employed as control strategy for machine side converter to maintain the constant DC voltage supplying to GSC without any additional DC-DC converter. The Adaline Based Load Side Converter (LSC) is employed to mitigate the harmonics and delivering the reactive power co-ordinately to load. A dynamic model of PMSG feeding Linear / Non linear loads using synchronous reference frame method are developed for predicting the system behaviour under various loading conditions. The result shows that the wind turbine operates at variable speed with optimized performance and the power quality improvement can be achieved in terms of minimum total harmonic distortion (THD) according to the IEEE 519 standard. The Adaline controller is used for accurate estimation of phase and frequency at the point of common coupling (PCC). The feasibility of the proposed system model and integrated control strategy are verified using MATLAB/Simulink simulations.

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Coordinated Control of Reactive Power between STATCOMs and Wind Farms for PCC Voltage Regulation

Cited by 21 publications

References 24 publications

Zero-Sequence Voltage Injection Method for DC Capacitor Voltage Balancing of Wye-Connected CHB Converter under Unbalanced Grid and Load Conditions

Zero-Sequence Voltage Injection Method for DC Capacitor Voltage Balancing of Wye-Connected CHB Converter under Unbalanced Grid and Load Conditions

Coordinated Reactive Power Control with a Variable Shunt Reactor and an Inverter-Based Wind Power Plant

Integrated Controller for Elimination of Harmonics in PMSG Based WECS Feeding Non Linear Load

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