Individual Phase Current Control With the Capability to Avoid Overvoltage in Grid-Connected Photovoltaic Power Plants Under Unbalanced Voltage Sags

Mirhosseini, Mitra; Pou, Josep; Agelidis, Vassilios G.

doi:10.1109/tpel.2015.2410285

Cited by 29 publications

(30 citation statements)

References 12 publications

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“…Phase Currents to Symmetric Sequence Currents Proposition 2. Let × ϕ be the rotation angle that translates the optimal active I px and reactive I qx phase currents in (17) and (18) to the symmetric sequence counterparts I p and I q . Under such consideration the active and reactive current references in (7) and (8), being the optimal solution to (10), are…”

Section: A Maximization Of the Lowest Phasementioning

confidence: 99%

“…Most of these works are based on symmetric sequences to deal with unbalanced grid voltages, which has been established as the preferred method to develop advanced voltage support controllers. The main features investigated in this research area cover: different voltage support objectives [16]- [20], [27], [28], maximum current injection during the sag [17], [19], [25], [26] and grid impedance matching [22]- [24]. However, none of these works joins these three features at the same time, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Control Strategy for Distribution Generation Inverters to Maximize the Voltage Support in the Lowest Phase During Voltage Sags

Camacho

Castilla

Miret

et al. 2018

IEEE Trans. Ind. Electron.

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Voltage sags are considered one of the worst perturbations in power systems. Distributed generation power facilities are allowed to disconnect from the grid during grid faults whenever the voltage is below a certain threshold. During these severe contingencies, a cascade disconnection could start, yielding to a blackout. To minimize the risk of a power outage, inverter-based distributedgeneration systems can help to support the grid by appropriately selecting the control objective. Which control strategy performs better when supporting the grid voltage is a complex decision that depends on many variables. This paper presents a control scheme that implements a smart and simple strategy to support the fault: the maximum voltage support for the lowest phase voltage. Therefore, the faulted phase that is more affected by the sag can be better supported since this phase voltage increases as much as possible, reducing the risk of under-voltage disconnection. The proposed controller has the following features: a) maximizes the voltage in the lowest phase, b) injects the maximum rated current of the inverter, and c) balances the active and reactive power references to deal with resistive and inductive grids. The control proposal is validated by means of experimental results in a laboratory prototype.

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Section: A Maximization Of the Lowest Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control Strategy for Distribution Generation Inverters to Maximize the Voltage Support in the Lowest Phase During Voltage Sags

Camacho

Castilla

Miret

et al. 2018

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

show abstract

“…It should be noticed that the selection of the voltage support control objective is still an open research topic. Most of the state-of-the-art controllers during grid faults [11]- [14], are applicable for mainly inductive grids, which limits this service to high power systems. However, few works have been proposed for medium and low voltage networks which is one of the main contributions of this work.…”

Section: Introductionmentioning

confidence: 99%

Positive and Negative Sequence Control Strategies to Maximize the Voltage Support in Resistive–Inductive Grids During Grid Faults

Camacho

Castilla

Miret

et al. 2018

IEEE Trans. Power Electron.

127

112

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Grid faults are one of the most severe perturbations in power systems. During these extreme disturbances, the reliability of the grid is compromised and the risk of a power outage is increased. To prevent this issue, distributed generation inverters can help the grid by supporting the grid voltages. Voltage support mainly depends on two constraints: the amount of injected current and the grid impedance. This paper proposes a voltage support control scheme that joins these two features. Hence, the control strategy injects the maximum rated current of the inverter. Thus, the inverter takes advantage of the distributed capacities and operates safely during voltage sags. Also, the controller selects the appropriate power references depending on the resistive-inductive grid impedance. Therefore the grid can be better supported since the voltage at the point of common coupling is improved. Several voltage objectives, which cannot be achieved together, are developed and discussed in detail. These objectives are threefold: a) to maximize the positive sequence voltage, b) to minimize the negative sequence voltage, and c) to maximize the difference between positive and negative sequence voltages. A mathematical optimal solution is obtained for each objective function. This solution is characterized by a safe peak current injection, and by the optimization of the voltage profile in any type of grid connection. Therefore, the proposed control scheme includes advanced features for voltage support during voltage sags, that are applicable to different power facilities in different types of networks. Due to system limitations, a suboptimal solution is also considered, analyzed and discussed for each of the optimization problems. Experimental results are presented to validate the theoretical solutions.

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“…Current controllers based on symmetrical components and linear quadratic regulators were considered in [14]. Control of the positive-sequence and negative-sequence reactive power for grid supporting was discussed in [10,[15][16][17]. Moreover, the upper and lower phase voltage limits were considered in [15,16].…”

Section: Introductionmentioning

confidence: 99%

Power oscillation analysis and control of three‐phase grid‐connected voltage source converters under unbalanced grid faults

et al. 2016

IET Power Electronics

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Control of three-phase grid-connected voltage source converter under unbalanced grid faults greatly depends on the active and reactive powers processed by the converter. The instantaneous active power theory with sequence decomposition is employed to analyse the instantaneous power components, especially the second-order oscillation power. Study shows that the second-order oscillation power comprises two quadrature components, the cosine and sine terms, which are contributed by the average active power and the average reactive power, respectively. This finding sheds insight on the regulation of oscillation power under unbalanced grid conditions. Based on this observation, the authors propose a positive and negative sequence conductance and susceptance control scheme, which enables simple regulation of the active power or reactive power oscillation with the average active power and reactive power control. In addition, the authors investigate the relationship between the positive/negative sequence conductance and susceptance distribution factors with power oscillation and peak current. A maximum current limitation scheme is embedded into the current reference generation block for overcurrent protection. Numerical simulations and prototype measurements verify the accuracy of the analysis and the effectiveness of the control scheme.

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Individual Phase Current Control With the Capability to Avoid Overvoltage in Grid-Connected Photovoltaic Power Plants Under Unbalanced Voltage Sags

Cited by 29 publications

References 12 publications

Control Strategy for Distribution Generation Inverters to Maximize the Voltage Support in the Lowest Phase During Voltage Sags

Control Strategy for Distribution Generation Inverters to Maximize the Voltage Support in the Lowest Phase During Voltage Sags

Positive and Negative Sequence Control Strategies to Maximize the Voltage Support in Resistive–Inductive Grids During Grid Faults

Power oscillation analysis and control of three‐phase grid‐connected voltage source converters under unbalanced grid faults

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