Direct power control of voltage source inverters with unbalanced grid voltages

Eloy-García, Joaquin; Arnaltes, Santiago; Rodriguez-Amenedo, José Luis

doi:10.1049/iet-pel:20070042

Cited by 113 publications

(71 citation statements)

References 19 publications

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“…It is worth noting that the proposed DPC scheme eliminates both the sequential separations of the voltages/currents and the complex calculations of the power compensating components, compared with the solutions in [10][11][12][13]. Meanwhile, it eliminates the PLL and its potential low-frequency-oscillatory behaviours.…”

Section: System Designmentioning

confidence: 99%

“…To develop the performance of the DPC scheme, different solutions have been proposed and reported. In [10][11][12][13], the required power compensating components on the basis of the selected control targets were added into the commanded values of the active and reactive powers. However, the power compensating components were calculated on the basis of the positive and negative sequence voltages/currents.…”

Section: Introductionmentioning

confidence: 99%

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Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance

Cheng¹,

Nian²

2016

IET Power Electronics

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This study proposes a direct power control (DPC) scheme for grid-connected voltage source inverter (VSI) in a virtual synchronous reference frame during frequency variations and network unbalances. The proposed DPC scheme applies a virtual phase angle instead of the voltage phase angle acquired by the phase-locked loop (PLL) for coordinated transformations. This approach can eliminate the PLL and its low-frequency-oscillatory behaviours during the frequency variations. Meanwhile, two available control targets, that is, smooth active power and smooth reactive power, are defined for the VSI operation during network unbalance. In the proposed DPC scheme, the reduced-order vector integrator is employed to directly regulate the power pulsations caused by the voltage unbalances. Consequently, it can eliminate both the sequential separations of the voltages/currents and the complex calculations of the power compensating components. Then, based on the mathematical model of the VSI control system, the control performance, including the steady-state power errors and the system stability, is fully analysed. Finally, both the simulation and experimental results are provided to confirm the effectiveness of the proposed DPC scheme.

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Section: System Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance

Cheng¹,

Nian²

2016

IET Power Electronics

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“…To avoid this disadvantage a three point controller for the reactive power was introduced as suggested in [5]. Zero voltage vectors are used, if a decrease in active power and no change in reactive power are demanded.…”

Section: Power and Voltage Estimationmentioning

confidence: 99%

Comparison of different control techniques for grid side VSC in terms of losses and current harmonics

Schroder

Gierschner

Eckel

2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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More and more wind power plants are built which use voltage source converters (VSC) to feed energy into grid. This paper compares two different control techniques and shows how virtual flux direct power control (VFDPC) reduces filtering requirements at the output of the converter and helps to save up to one quarter of converter losses. Furthermore the influence of a reduced, variable dc link voltage of the wind power plant itself and its converter control is discussed.

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“…DPC can be classified into two categories, hysteresis controller based DPC (HC-DPC) [4]- [5] and space vector modulation based DPC (SVM-DPC) [10]- [11]. Paper [12] proposed a modified predictive DPC in stationary reference frame to obtain the balanced and sinusoidal current under the unbalanced grid conditions.…”

Section: Introductionmentioning

confidence: 99%

Improved DPC Strategy of Grid-connected Inverters under Unbalanced and Harmonic Grid Conditions

Shen¹,

Nian²

2014

Journal of international Conference on Electrical Machines and

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-This paper presents an improved direct power control (DPC) strategy for gridconnected voltage source inverter (VSI) under unbalanced and harmonic grid voltage conditions. Based on the mathematic model of VSI with the negative sequence, 5th and 7th harmonic voltage components consideration, a PI controller is used in the proposed DPC strategy to achieve the average output power regulation. Furthermore, vector PI controller with the resonant frequency tuned at the two times and six times grid fundamental frequency is adopted to regulate both negative and harmonic components, and then two alternative targets of the balanced/sinusoidal current and smooth active/reactive output power can be achieved. Finally, simulation results based on MATLAB validate the availability of the proposed DPC strategy.

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Direct power control of voltage source inverters with unbalanced grid voltages

Cited by 113 publications

References 19 publications

Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance

Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance

Comparison of different control techniques for grid side VSC in terms of losses and current harmonics

Improved DPC Strategy of Grid-connected Inverters under Unbalanced and Harmonic Grid Conditions

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