A Low-Voltage Ride-Through Technique for Grid-connected Converters with Reduced Power Transistors Stress

Chen, Hsin-Chih; Lee, Chia-Tse; Cheng, Po-Tai; Teodorescu, Remus; Blaabjerg, Frede

doi:10.1109/tpel.2016.2522511

Cited by 50 publications

(52 citation statements)

References 16 publications

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“…[22] has proposed a LVRT control strategy in the d-q reference frame for the gridconnected converters without considering the characteristics of a renewable energy source, either PV or wind. The proposed method in [23] has improved the Dual Vector Current Control (DVCC) method to control the high peak currents and minimize the power ripple. In [24], a three-phase system has been investigated, which offers six current control freedoms with a zero-sequence current path to mitigate both active and reactive power oscillations and also inject sinusoidal currents.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, dc link ripples during unbalanced faults are reduced with proper control of the converter. Among the major contributions of the paper is to investigate the effects of the PV arrays on the entire system and propose a control strategy for the PV side under unbalanced grid faults in contrast to [5,22,23,26,28]; in these works, the current reference generation and grid side control have been discussed. Therefore, the operation of a two-stage grid-connected PV converter under LVRT conditions can be rarely found in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Afshari

Moradi

Rahimi

et al. 2017

IEEE Trans. Ind. Electron.

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214

148

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Abstract-Power quality and voltage control are among the most important aspects of the grid-connected power converter operation under faults. Non-sinusoidal current may be injected during unbalanced voltage sag and active or/and reactive power may include double frequency content. This paper introduces a novel control strategy to mitigate the double grid frequency oscillations in the active power and dc-link voltage of the two-stage three-phase grid-connected Photovoltaic (PV) inverters during unbalanced faults. With the proposed control method, PV inverter injects sinusoidal currents under unbalanced grid faults. In addition, an efficient and easy-to-implement current limitation method is introduced, which can effectively limit the injected currents to the rated value during faults. In this case, the fault-ride-through operation is ensured and it will not trigger the overcurrent protection. A Non-MPPT operation mode is proposed for the dc-dc converter. The mode is enabled under severe faults, when the converter cannot handle the maximum PV power. Finally experimental validation is provided by implementing method in an experimental setup including a 2kW PV inverter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Afshari

Moradi

Rahimi

et al. 2017

IEEE Trans. Ind. Electron.

Self Cite

214

148

View full text Add to dashboard Cite

show abstract

“…In recent years, the potential of VSCs to provide positive-and negative-sequence short circuit currents simultaneously has received increasing attention [9][10][11][12][13][14][15]. In [9,10], a negative-sequence current was injected to help reduce the active power or reactive power oscillations. The focus was on the VSC itself and its impact on the grid was not investigated.…”

Section: Introductionmentioning

confidence: 99%

Fault Analysis Method Considering Dual-Sequence Current Control of VSCs under Unbalanced Faults

2018

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Abstract:Voltage source converters (VSCs) are able to provide both positive-and negative-sequence short circuit currents under unbalanced faults. Their short circuit responses can be significantly different from those of conventional synchronous generators. This paper developed a static fault analysis method by considering dual-sequence current control of VSCs under unbalanced faults where VSCs are treated as voltage-dependent current sources in both positive-and negative-sequence networks. Since the control strategy of VSCs varies, flexible parameters are included in the model to reflect their diverse short circuit behaviours. The proposed method is verified through a modified IEEE 9-bus system and a simplified western Danish power system with real time simulations. This analytical method can be used to help understand and evaluate the impact of dual-sequence current control of VSCs on future converter-dominated power systems.

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“…During the last decade, different control strategies have been presented to improve the performance of the inverter during grid faults and to guarantee power delivery to loads during a short-term voltage drop [18]- [31], most of them based on symmetrical components since their use allow Control Strategy for Grid-Connected ThreePhase Inverters During Voltage Sags to Meet Grid Codes and to Maximize Power Delivery Capability…”

mentioning

confidence: 99%

Control Strategy for Grid-Connected Three-Phase Inverters During Voltage Sags to Meet Grid Codes and to Maximize Power Delivery Capability

Lopez

Vicuña

Miret

et al. 2018

IEEE Trans. Power Electron.

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A Low-Voltage Ride-Through Technique for Grid-connected Converters with Reduced Power Transistors Stress

Cited by 50 publications

References 16 publications

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Fault Analysis Method Considering Dual-Sequence Current Control of VSCs under Unbalanced Faults

Control Strategy for Grid-Connected Three-Phase Inverters During Voltage Sags to Meet Grid Codes and to Maximize Power Delivery Capability

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