A novel control method for unified power quality conditioner (UPQC) under non-ideal mains voltage and unbalanced load conditions

Kesler, Metin; Özdemir, Engin

doi:10.1109/apec.2010.5433643

Cited by 32 publications

(30 citation statements)

References 11 publications

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“…Although, these two strategies are based on balanced three-phase systems, they can be used for single phase systems too [22,23]. In Some researches, these two control methods are combined to achieve a better performance for UPQC [24,25]. In most of these methods, a low pass filter (LPF) or a high pass filter (HPF) is used for separating the harmonic components from fundamental component.…”

Section: Introductionmentioning

confidence: 99%

A New Approach Based on Instantaneous Power Theory for Improving the Performance of UPQC Under Unbalanced and Distortional Load Conditions

2015

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In order to deal with power quality problems under distortional and unbalanced load conditions, this paper presents a new control method for a four-wire three-phase unified power quality conditioner (UPQC) which is based on instantaneous power p-q theory. The proposed control approach is based on instantaneous power and is optimized by using a self-tuning filter (STF), without using any low-pass filters (LPFs) or phase locked loop (PLL), and without measuring load or filter currents. In this approach, the load and source voltages are used to generate the reference voltages of a series active power filter (APF) and source currents are used to generate the reference currents of a shunt APF. Therefore, the number of times that current is measured is reduced and system performance is improved. The performance of the proposed control approach is evaluated in terms of power factor correction, source neutral current mitigation, load balancing and mitigation of the current and voltage harmonics of distortional and unbalanced loads in a three-phase four-wire system. The results obtained by MATLAB/SIMULINK software show the effectiveness of the proposed control technique in comparison to the conventional p-q method.Key words: Current harmonic mitigation, power quality, source neutral current mitigation, unified power quality conditioner (UPQC), voltage harmonic mitigation Novi pristup za poboljšanje karakteristika UPQC-a tijekom nesimetričnih i distorzijskih uvjeta tereta temeljen na teoriji trenutne snage. U ovom radu prikazana je nova metoda upravljanja za trofazničetverožični UPQC (engl. unified power quality conditioner) temeljena na teoriji trenutne vrijednosti snage koja je prikladna za upravljanje tijekom distorzijskih i nesimetričnih uvjeta na teretu. Predloženo upravljanje temelji se na teoriji o trenutnoj radnoj i jalovoj snazi i optimirano je korištenjem samopodešavajućeg fitera, bez korištenja niskopropusnih filtera ili PLL-a i bez mjerenja struje tereta i filtra. Korišteni su naponi na teretu i napon izvora kako bi se generirala referentna vrijednost napona aktivnog filtra, a struje izvora koriste se za generiranje referentne vrijednosti struje aktivnog filtra. Na taj način smanjen je broj mjerenja struje i sustav ima bolje značajke. Uz predloženi sustav upravljanja testire su mogućnosti korekcije faktora snage, smanjenja neutralne struje izvora, balansiranja tereta, smanjenje harmonika u struji i naponu. Rezultati dobiveni pomoću MATLAB/SIMULINK-a pokazuju učinkovitost predloženog sustava upravljanja.Ključne riječi: smanjenje harmonika u struji, kvaliteta energije, smanjenje neutralne struje izvora, UPQC, smanjenje harmonika u naponu

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Section: Introductionmentioning

confidence: 99%

A New Approach Based on Instantaneous Power Theory for Improving the Performance of UPQC Under Unbalanced and Distortional Load Conditions

2015

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“…However, in this structure six more IGBTs are needed compared with a three-phase half-bridge inverter, and this will increase the control complexity and the cost. In [6], the grid current and load voltage references in both dq and ab coordinates are calculated, and then hysteresis control is used to achieve grid current balance. However, the switching frequency of hysteresis control is not constant, and in [6] the design of appropriate LC filters is not considered.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], the grid current and load voltage references in both dq and ab coordinates are calculated, and then hysteresis control is used to achieve grid current balance. However, the switching frequency of hysteresis control is not constant, and in [6] the design of appropriate LC filters is not considered. In [7], the grid currents are controlled as balanced sinusoidal currents in the positive and negative sequence double synchronous rotating coordinates under unbalanced loads.…”

Section: Introductionmentioning

confidence: 99%

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Balance control of grid currents for UPQC under unbalanced loads based on matching-ratio compensation algorithm

Zhao

Zhang

Chai

et al. 2018

J. Mod. Power Syst. Clean Energy

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In three-phase four-wire systems, unbalanced loads can cause grid currents to be unbalanced, and this may cause the neutral point potential on the grid side to shift. The neutral point potential shift will worsen the control precision as well as the performance of the threephase four-wire unified power quality conditioner (UPQC), and it also leads to unbalanced three-phase output voltage, even causing damage to electric equipment. To deal with unbalanced loads, this paper proposes a matching-ratio compensation algorithm (MCA) for the fundamental active component of load currents, and by employing this MCA, balanced three-phase grid currents can be realized under 100% unbalanced loads. The steady-state fluctuation and the transient drop of the DC bus voltage can also be restrained. This paper establishes the mathematical model of the UPQC, analyzes the mechanism of the DC bus voltage fluctuations, and elaborates the interaction between unbalanced grid currents and DC bus voltage fluctuations; two control strategies of UPQC under three-phase stationary coordinate based on the MCA are given, and finally, the feasibility and effectiveness of the proposed control strategy are verified by experiment results.

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“…Power systems, have many nonlinear loads, which significantly affect the quality of power supplies [11], [12].Power quality can be classified into three categories that is, voltage stability, continuity of supplying power, and voltage. Comprehensive review of compensating type custom power devices, issues of power quality [13][14][15][16] The control strategy is for series converter along with the DC link control.…”

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confidence: 99%

Enhancement Of Power Quality Using Series Active Power Filter Based On Distributed Generation.

2018

IJRTER

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.This paper deals with the performance of Series Active Power Filter (SAPF) for the power quality improvement based on the distributed generation. The SAPF has the ability to mitigate the voltage related problems in the distribution system. The real power supply is given by the PV system (Distributed Generation) for the compensation of the voltage related problems. The control strategy is achieved through the Synchronous Reference Frame Theory for the generation of the reference voltage which is compared with constant voltage for pulse generation using hysteresis band PWM. The SAPF has the better performance in the elimination of the voltage related problems in the distribution side. The performance of SAPF is modeled and simulated using MATLAB / SIMULINK.

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A novel control method for unified power quality conditioner (UPQC) under non-ideal mains voltage and unbalanced load conditions

Cited by 32 publications

References 11 publications

A New Approach Based on Instantaneous Power Theory for Improving the Performance of UPQC Under Unbalanced and Distortional Load Conditions

A New Approach Based on Instantaneous Power Theory for Improving the Performance of UPQC Under Unbalanced and Distortional Load Conditions

Balance control of grid currents for UPQC under unbalanced loads based on matching-ratio compensation algorithm

Enhancement Of Power Quality Using Series Active Power Filter Based On Distributed Generation.

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