The current control of PV inverter for low voltage ride through

Wu, Yong-Sih; Chang, Chun-Ti; Chen, Yaow-Ming; Cheng, Chuan-Sheng; Liu, Chih-Wen; Chang, Yung‐Ruei

doi:10.1109/epepemc.2012.6397396

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…For two-stage converters, which can get extra control variable of input current, the control strategy could be more flexible. The maximum current amplitude control (MCAC) strategy is proposed in [37], which injects as much real power as possible and limits the maximum current amplitude. Reference [38] defines several modes for the first stage of grid-tied inverters to maintain balanced power.…”

Section: Power Blance Controlmentioning

confidence: 99%

A review of low voltage ride-through techniques for photovoltaic generation systems

Tian

Gao

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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The rapid development of photovoltaic (PV) generation systems has made the low voltage ride-through (LVRT) techniques, which is stepping forward fast, more and more important. This paper presents a review of LVRT techniques for PV generation systems, which mainly focuses on the critical techniques of fault detection and grid synchronization, current control and dc-link voltage control under various voltage dip operation conditions and overall solutions for a large-scale PV station with detailed illustration. Besides, the development trends of low voltage ride-through techniques for PV generation systems are discussed as well.

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Section: Power Blance Controlmentioning

confidence: 99%

A review of low voltage ride-through techniques for photovoltaic generation systems

Tian

Gao

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…The sequence separation and detection methods for LVRT during unbalance voltage sag are proposed in [22]. The maximum current limitation control (MCLC) for the three-phase inverter is presented by [23] to provide the maximum reactive power under the allowable current amplitude. In order to prevent the circuit damage from severe voltage fault, a dc-link voltage adjustment method for the inverter is proposed in [24].…”

Section: Introductionmentioning

confidence: 99%

PV Power System With Multi-Mode Operation and Low-Voltage Ride-Through Capability

Tang

Chen

2015

IEEE Trans. Ind. Electron.

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150

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A multi-mode operation for the three-phase PV power system with low-voltage ride-through (LVRT) capability is proposed. With the proposed multi-mode control strategy, the active power from the PV arrays can be continuously extracted by the interleaved boost converter during LVRT while the maximum power point tracking (MPPT) operation can be quickly achieved after the grid fault clearance. Also, the multichannel boost converter with interleaved operation can increase power conversion efficiency while decreasing the input current ripple. On the other hand, the maximum current limitation control (MCLC) of the three-phase inverter can provide maximum reactive power under rated current amplitude during the voltage sag period as well as output the demanded reactive/rated current ratio to meet different LVRT codes. A three-phase 5kVA prototype PV converter is built and tested to verify the performance of the proposed multi-mode operation strategy and the LVRT capability.Index Terms-PV power system, MPPT, Interleaved Converter, Three-phase inverter, LVRT.I. 0278-0046 (c)

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“…Mode switching operations in conventional LVRT schemes may also cause system instability. In previous LVRT approaches, the PV inverter still abandons the MPPT function of the inverter, and then the inverter takes several minutes to restart after the fault even if the voltage sag fault only remains for several grid cycles [14]. The inverter does not only reduce solar energy harvesting, but also degrades the stability of the power system because of sudden active power drops.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to Ref. [11], the control system is switched from MPPT mode to non-MPPT mode by comparing the grid feeding active power before grid voltage sag fault with the allowed maximum grid feeding active power during the fault period [14]. However, as mentioned earlier, the switching operation may cause voltage and/or current spikes at the instant of transfer.…”

Section: Introductionmentioning

confidence: 99%

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A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters

Fang¹,

Dong²,

Khahro³

et al. 2015

Journal of Power Electronics

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Based on the inherent relationship between dc-bus voltage and grid feeding active power, two dc-bus voltage regulators with different references are adopted for a grid-connected PV inverter operating in both normal grid voltage mode and low grid voltage mode. In the proposed scheme, an additional dc-bus voltage regulator paralleled with maximum power point tracking controller is used to guarantee the reliability of the low voltage ride-through (LVRT) of the inverter. Unlike conventional LVRT strategies, the proposed strategy does not require detecting grid voltage sag fault in terms of realizing LVRT. Moreover, the developed method does not have switching operations. The proposed technique can also enhance the stability of a power system in case of varying environmental conditions during a low grid voltage period. The operation principle of the presented LVRT control strategy is presented in detail, together with the design guidelines for the key parameters. Finally, a 3 kW prototype is built to validate the feasibility of the proposed LVRT strategy.

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The current control of PV inverter for low voltage ride through

Cited by 20 publications

References 14 publications

A review of low voltage ride-through techniques for photovoltaic generation systems

A review of low voltage ride-through techniques for photovoltaic generation systems

PV Power System With Multi-Mode Operation and Low-Voltage Ride-Through Capability

A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters

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