A Novel Real-time Voltage and Frequency Compensation Strategy for Photovoltaic-based Microgrid

Shi, Hongtao; Zhuo, Fang; Hao, Yi; Wang, Feng; Zhang, Dong; Geng, Zhiqing

doi:10.1109/tie.2014.2371434

Cited by 49 publications

(27 citation statements)

References 34 publications

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“…There are two options: an open loop active power versus frequency control, with a hysteresis droop curve, or a defined look-up table; or a control droop method over the active power reference, in order to emulate the characteristic of synchronous generators against frequency excursions. All of them have been applied widely for PV microgrids [9,[13][14][15][16][17][18][19][20]. However, these techniques are not able to be applied on USPVPs, because the capacity of one inverter could not be enough to move the grid frequency [21,22].…”

Section: Local Curtailmentmentioning

confidence: 99%

“…[1]. The most popular technology for PV applications is a battery energy storage system (BESS) [13][14][15][16][17][18][19][20][21][22][23][26][27][28][29].…”

Section: Local Curtailmentmentioning

confidence: 99%

“…It needs a special attention on the grid frequency stability control actions [8,9]. Frequency regulation (FR) techniques have been studied widely in the literature [1,[9][10][11][12][13][14][15][16][17][18][19][20]. All FR methods require a reduction over the active power generation on USPVPs.…”

Section: Introductionmentioning

confidence: 99%

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Power Production Losses Study by Frequency Regulation in Weak-Grid-Connected Utility-Scale Photovoltaic Plants

et al. 2016

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Abstract:Nowadays, an increasing penetration of utility-scale photovoltaic plants (USPVPs) leads to a change in dynamic and operational characteristics of the power distribution system. USPVPs must help to maintain the system stability and reliability while implementing minimum technical requirements (MTRs) imposed by the utility grid. One of the most significant requirements is about frequency regulation (FR). Overall production of USPVPs is reduced significantly by applying FR curves, especially in weak grids with high rate of frequency faults. The introduction of a battery energy storage system (BESS) reduces losses and improves the grid system reliability. Experimental frequency and irradiance data of several weak grids have been used to analyse USPVPs losses related to FR requirements and benefits from the introduction of a BESS. Moreover, its economic viability is showen without the need for any economic incentives.

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Section: Local Curtailmentmentioning

confidence: 99%

“…[1]. The most popular technology for PV applications is a battery energy storage system (BESS) [13][14][15][16][17][18][19][20][21][22][23][26][27][28][29].…”

Section: Local Curtailmentmentioning

confidence: 99%

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Power Production Losses Study by Frequency Regulation in Weak-Grid-Connected Utility-Scale Photovoltaic Plants

et al. 2016

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“…It is important to clarify that even with a secondary control layer with no communications, a general communication system is needed for other functionalities of the microgrid as coordination of units during black start processes, real-time monitoring or tertiary control layer. However, reduction of the dependence on communications on each control layer represents an improvement on the reliability of the microgrid [22]. With less dependence on communications, the impact of the real-time data transmission over the control objectives is reduced and the security in terms of communication vulnerability risks is improved.…”

Section: Introductionmentioning

confidence: 99%

Secondary Switched Control With no Communications for Islanded Microgrids

Rey

Martí

Velasco

et al. 2017

IEEE Trans. Ind. Electron.

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Abstract-Flexibility and reliability of AC microgrids are enhanced by reducing the dependence on communications in multi-layer hierarchical control. In this sense, this paper presents a secondary control with no communications for islanded microgrids. It is based on a control scheme that switches between two configurations according to a time-dependent protocol. With this proposal, an excellent performance in terms of transient response and frequency restoration in steady-state is achieved. The paper also presents design considerations for the control parameters. In addition, the theoretical predictions are validated by experimental results from a laboratory microgrid.Index Terms-Distributed generation, hierarchical control, islanded microgrids, secondary control, switched control, time-dependent protocol. I. INTRODUCTIONICROGRIDS have recently emerged as a potential solution for electrical supply due to their advantages as environmental impacts reduction, reliability, and flexible operability [1], [2]. Basically, a microgrid is a cluster of distributed generators (DGs), loads, and energy storage systems which can operate in two possible modes: gridconnected or islanded [3].In islanded mode, microgrids are disconnected from the main grid intentionally or by an electrical fault and the DGs provide active and reactive power to the local loads [4]. To control frequency, voltage amplitude or power sharing, a multi-layer hierarchical scheme can be implemented, normallyManuscript received Month xx, 2xxx; revised Month xx, xxxx; accepted Month x, xxxx. This work has been supported by ELAC2014/ESE0034 from the European Union and its linked Spanish national project PCIN-2015-001. We also appreciate the support from the Ministry of Economy and Competitiveness of Spain and the European Regional Development Fund (FEDER) under projects ENE2015-64087-C2-1-R and TEC2013-46938-R.Juan M. Rey is with Escuela de Ingenierías Eléctrica, Electrónica y de Telecomunicaciones (E3T), Universidad Industrial de Santander (UIS), 680002 Bucaramanga, Colombia and with the Electronic Engineering Department, Technical University of Catalonia, Av. Victor Balaguer s/n, 08800 Vilanova i Ia Geltrú, Spain (e-mail: juanmrey@uis.edu.co).Pau Marti and Manel Velasco are with the Automatic Control Department, Technical University of Catalonia, Pau Gargallo 5, 08028 Barcelona, Spain.Jaume Miret and Miguel Castilla are with the Electronic Engineering Department, Technical University of Catalonia, Av. Victor Balaguer s/n, 08800 Vilanova i la Geltrú, Spain. divided in three control layers: primary, secondary and tertiary layer [5].Primary layer rapidly controls power sharing and stabilizes frequency and output voltage amplitude in each DG. However, steady-state errors or deviations are introduced, which are corrected by the secondary layer. Tertiary layer manages and coordinates the operation of the power flows at optimal points considering economic concerns (i.e., energy prices and electricity markets) and grid requirements (i.e., reactive power flows contr...

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“…Under the unbalanced condition, the inverter in MG output three unbalance currents, which contain a large percentage of negative sequence currents. The inverter performance would be seriously affected, the potential issues like: unbalance output voltage due to the negative voltage drop across the output impedance and the inverter output power is fluctuant, leading to voltage and frequency fluctuations [11]. The aforementioned issues degrade MG quality dramatically.…”

Section: Introductionmentioning

confidence: 99%

Control strategy for microgrid under three-phase unbalance condition

Shi

Zhuo

Hao

et al. 2016

J. Mod. Power Syst. Clean Energy

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Microgrid (MG) is generally developed at utility terminal which contains lots of unbalanced loads and distributed generations (DGs). The interaction between MG and the unbalance loads or DGs will degrades the control performance of interfaced inverter in MG and dramatically leads to MG voltage unbalance. In this paper, a negative-sequence compensation based three-phase voltage unified correction strategy is proposed. While MG operates in islanded mode, a positive virtual impedance control is used to eliminate the negative voltage resulted from the negative-sequence current, and then a positive-sequence voltage control loop and negative-sequence control loop are used to improve the inverter control performance. While MG operates in grid-tied mode, the inverter operates as a negative-sequence current source to compensate the negative-sequence currents of loads to guarantee the point of common coupling (PCC) voltage balance. By using the proposed strategy, the voltage control performance of inverter can be improved; the MG power quality can be enhanced significantly. Simulation and experimental results verify the effectiveness of the proposed method.

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A Novel Real-time Voltage and Frequency Compensation Strategy for Photovoltaic-based Microgrid

Cited by 49 publications

References 34 publications

Power Production Losses Study by Frequency Regulation in Weak-Grid-Connected Utility-Scale Photovoltaic Plants

Power Production Losses Study by Frequency Regulation in Weak-Grid-Connected Utility-Scale Photovoltaic Plants

Secondary Switched Control With no Communications for Islanded Microgrids

Control strategy for microgrid under three-phase unbalance condition

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