Active and Reactive Power Compensation Control Strategy for VSC-HVDC Systems under Unbalanced Grid Conditions

Liu, Weiming; Liu, Ziwen; Zhai, Fan; Kang, Yilong; Wang, Da; Zhang, Mingming; Miao, Shihong

doi:10.3390/en11113140

Cited by 10 publications

(7 citation statements)

References 28 publications

(43 reference statements)

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“…The phase current difference of the abrupt phase selection component is a component that judges the fault phase by comparing the relationship between the magnitudes of the abrupt changes of the phase current difference between the two phases [16][17][18][19][20], and the phase current difference mutation amount is defined as:…”

Section: Phase Current Difference Of the Abrupt Phase Selection Compomentioning

confidence: 99%

LS-Solar-PV System Impact on Line Protection

et al. 2019

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Large-scale photovoltaic power station access to the grid will profoundly change the fault current characteristics of the power station’s outgoing lines. This change results in adaptive problems in traditional protection phase selection components, which may cause incorrect actions in reclosing, protection ranging, and distance protection. Based on the fault current characteristics of the large-scale photovoltaic power station transmission line, this paper analyzes the adaptability of the phase current difference mutation and the sequence component phase selection component in protecting the Photovoltaic (PV) power plant side of the transmission line. Based on the fault current analytical formula, the phase relationship between the phase current difference and the current sequence component under different control targets, such as suppressing negative sequence current, suppressing the active power fluctuation, and suppressing the reactive power fluctuation, is derived. The operational performances of the phase–phase current difference of the abrupt phase selection component and the sequence component phase selection component of the power station side are degraded, which may cause incorrect operation of the phase selection component. Based on the actual engineering parameters of a PV power plant, a simulation model was built in Power System Computer Aided Design (PSCAD) to verify the correctness of the theoretical analysis.

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Section: Phase Current Difference Of the Abrupt Phase Selection Compomentioning

confidence: 99%

LS-Solar-PV System Impact on Line Protection

et al. 2019

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“…Note that I αh and I βh are the real and imaginary parts of every i re f ,h αβ at the sample under study, that is, the present values that are used for extrapolation. Finally, the minimum k S , which is obtained by solving (17) for each extrapolated sample, would be chosen as it would represent the most limiting scenario. The input and output of the MPCS are shown in Figure 4g.…”

Section: Maximum Peak Current Saturator (Mpcs)mentioning

confidence: 99%

“…Hence, an effective multifrequency current reference calculator is required by the algorithm to accomplish the power ripple removal.The presented control objective has an unavoidable characteristic in three-phase three-wire systems-the elimination of active power oscillations implies more reactive power fluctuations [13,16]. Previous publications such as References [17][18][19] claimed the elimination of both active and reactive power oscillations, simultaneously. However, this approach in three-wire systems leads to the injection of zero-sequence currents.…”

mentioning

confidence: 90%

Enhanced Current Reference Calculation to Avoid Harmonic Active Power Oscillations

Serrano

Moriano²,

Rizo

et al. 2019

Energies

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Energy storage systems play a key role in the rise of distributed power generation systems, hence there is great interest in extending their lifetimes, which are directly related to DC current ripple. One of the ripple sources is the low-frequency active power fluctuations under unbalanced and distorted grid voltage conditions. Therefore, this paper addresses a multifrequency control strategy where the harmonic reference currents are calculated to reduce harmonic active power oscillations. The stationary reference frame (StRF) approach taken here improves the precision and computational time of the current reference calculation method. Additionally, in order to ensure safe converter operation when a multifrequency reference current is provided, a computational efficient peak current saturator is applied while avoiding signal distortion every time step. If the injected current harmonic distortion is to be minimized, which is a feature included in this work, the peak current saturator is a necessary requirement. Active power ripple is reduced even with frequency variations in the grid voltage using a well-known frequency-adaptive scheme. The simulation and experimental results prove the optimized performance for the control objective: power ripple reduction with minimum current harmonic distortion.Energies 2019, 12, 4075 2 of 21 torque pulsations [9]. Besides, on doubly fed induction generators (DFIGs) for wind turbines, active power oscillations are related to electromagnetic torque ripples that increase the mechanical stress on the turbine system [10].The harmonic power oscillations in three-phase three-wire AC electrical systems come from the presence of distorted or unbalanced grids. Therefore, the control strategy aims to regulate the instantaneous active power at a constant value by injecting the suitable currents into the grid. The current reference could be calculated by means of the active and reactive power theory, first introduced in Reference [11]. From that theory, many works have dealt with the regulation of active power oscillations when grid imbalances [12,13] or grid faults [14][15][16] are faced by the power converter. However, these methodologies only remove the second harmonic power ripple due to the appearance of fundamental negative sequence (FNS) voltage and its interaction with the fundamental positive sequence (FPS) current. In distorted grids, there are higher even harmonic power ripples due to other harmonic sequence voltages (−5, +7, −11, +13). Hence, an effective multifrequency current reference calculator is required by the algorithm to accomplish the power ripple removal.The presented control objective has an unavoidable characteristic in three-phase three-wire systems-the elimination of active power oscillations implies more reactive power fluctuations [13,16]. Previous publications such as References [17][18][19] claimed the elimination of both active and reactive power oscillations, simultaneously. However, this approach in three-wire systems leads to the injection of zero-sequence...

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“…Due to this, PBC finds applications in microgrids [8,9], inverters [10], wind power systems [11], HVDC [12], power converter-based applications [13][14][15][16][17][18][19][20][21][22], robotics [23][24][25], MEMS [26], ball and beam dynamical systems [27] and photovoltaic systems [28].…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Implementation of Passivity-Based Control and Estimation of Load Torque for a Luo Converter with Dynamic Load

2020

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In this paper, passivity-based control (PBC) of a Luo converter-fed DC motor is implemented and presented. In PBC, both exact tracking error dynamics passive output feedback control (ETEDPOF) and energy shaping and damping injection methods do not require a speed sensor. As ETEDPOF does not depend upon state computation, it is preferred in the proposed work for the speed control of a DC motor under no-load and loaded conditions. Under loaded conditions, the online algebraic approach in sensorless mode (SAA) is used for estimating different load torques applied on the DC motor such as: constant, frictional, fan-type, propeller-type and unknown load torques. Performance of SAA is tested with the reduced order observer in sensorless mode (SROO) approach and analyzed, and the results are presented to validate the low-cost implementation of PBC for a DC drive without a speed and torque sensor.

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Active and Reactive Power Compensation Control Strategy for VSC-HVDC Systems under Unbalanced Grid Conditions

Cited by 10 publications

References 28 publications

LS-Solar-PV System Impact on Line Protection

LS-Solar-PV System Impact on Line Protection

Enhanced Current Reference Calculation to Avoid Harmonic Active Power Oscillations

Low-Cost Implementation of Passivity-Based Control and Estimation of Load Torque for a Luo Converter with Dynamic Load

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