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1

Simultaneous sitting PVU and DSTATCOM in distribution grid considering the effect of geographical condition

Schalchi F., Mozafari B., Firouz M. Hosseini

Journal of Power Technologies

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2024

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Vol. 104, nr 1

1--14

EN

This paper proposes a model to allocate photovoltaic unit (PVU) and distribution static compensator (DSTATCOM) that incorporate the operation effect of PVU in sizing and sitting problem. The model is based on the dynamic assessment of PVU production and the effect of it on placement of PVU and DSTATCOM. Geographical conditions are interfered in placement problem of PVU and DSTATCOM simultaneously. The model is verified in a multi-objective form. The multi-objective problem is formulated based on voltage stability, liability, power loss and total cost of PVU and DSTATCOM. This problem is solved by employing optimization techniques and the results of optimization processes are tested in different scenarios. Uncertainty in network loads is an inevitable task that should be considered in network planning. Uncertainty in the presented model has been defined as a set of divided parts in the presented model. The proposed model has been evaluated on two test systems, 30 bus and 69 bus. The obtained results indicate that the presented model can be employed to study the intermittent behavior of PVU in placement problem.

2

Enhancement performance of DSTATCOM depending on PV system supply control

Abdulnafa Aymen Dhafer, Ahmed Suha S

Przegląd Elektrotechniczny

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2023

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R. 99, nr 1

105--110

EN

This article examines the impacts of a transient analysis of a compensator of static synchronous on a system of distribution power (DSTATCOM) on power quality when a PV system DC input source is utilised to supply the system. Due to the nature of these sources' operation, including renewable energy on the input power supply has a variety of ramifications for DSTATCOM's operation. In order to understand the variance in temporal response and its impact on the compensatory process, the dynamic response of the distribution system is investigated under the influence of both battery and PV system sources (PV-Battery). Renewable energy is connected across the dc-link capacitor channel to characterize their impact on the power system's dynamic performance. In this study, three scenarios were investigated: first, photovoltaic (PV) cells are connected solely via the dc-link, second, battery storage is connected solely, and third, a PV system structure (PV cells + battery storage) is explored. DSTATCOM is used to compensate for the reduction in reactive and active power that happens during balanced and unbalanced operation of non-linear loads. The presence of a renewable source enhances the system's power quality by reducing the current source's harmonic components. The Star / Delta transformer is also used to split the three-phase legs of the DSTATCOM VSC, providing a channel for the fundamental zero sequence and a balanced three-phase current. STATCOM control circuit based on synchronous reference frames (SRF).

PL

W niniejszym artykule zbadano wpływ analizy stanu nieustalonego kompensatora synchronicznej statycznej na system zasilania dystrybucyjnego (DSTATCOM) na jakość energii, gdy źródło wejściowe DC systemu fotowoltaicznego jest wykorzystywane do zasilania systemu. Ze względu na charakter pracy tych źródeł, uwzględnianie energii odnawialnej na zasilaniu wejściowym ma różne konsekwencje dla pracy DSTATCOM. Aby zrozumieć wariancję odpowiedzi czasowej i jej wpływ na proces kompensacyjny, badana jest dynamiczna odpowiedź systemu dystrybucyjnego pod wpływem zarówno źródeł baterii, jak i systemu PV (PV-Battery). Energia odnawialna jest podłączona przez kanał kondensatora dc-link, aby scharakteryzować ich wpływ na dynamikę systemu zasilania. W niniejszym badaniu zbadano trzy scenariusze: po pierwsze, ogniwa fotowoltaiczne (PV) są połączone wyłącznie za pośrednictwem łącza prądu stałego, po drugie magazynowanie baterii jest podłączone wyłącznie, a po trzecie, zbadano strukturę systemu PV (ogniwa fotowoltaiczne + magazynowanie baterii). DSTATCOM służy do kompensacji redukcji mocy biernej i czynnej, która ma miejsce podczas pracy zrównoważonej i niezrównoważonej obciążeń nieliniowych. Obecność źródła odnawialnego poprawia jakość zasilania systemu poprzez redukcję składowych harmonicznych źródła prądu. Transformator gwiazda/trójkąt jest również używany do rozdzielenia trójfazowych odgałęzień DSTATCOM VSC, zapewniając kanał dla podstawowej sekwencji zerowej i zrównoważonego prądu trójfazowego. Obwód sterowania STATCOM oparty na synchronicznych ramkach odniesienia (SRF).

3

Evaluation of SVC-coupled hybrid DSTATCOM using JLMS algorithm for enhancement of power quality

Mangaraj Mrutyunjaya, Sabat Jogeswara

Power Electronics and Drives

|

2023

|

Vol. 8 (43)

21-30

EN

This research study explains the design and performance of a Static VAR Compensator (SVC) coupled Hybrid Distribution Static Compensator (DSTATCOM) for low voltage power distribution system (PDS). A comparative analysisis done between Voltage Source Inverter (VSI)-based DSTATCOM and SVC Hybrid DSTATCOM using Jordan Least Mean Square (JLMS) algorithm to alleviate the shunt-related power quality (PQ) glitches. The specific design is obtained as compared to the existing neural network toolbox algorithm to improve the estimation speed and accuracy. The main objective is to extract the tuned weighted values of fundamental active and reactive power components of distorted load currents for the switching signal generation using an adaptive JLMS algorithm. Several functions of DSTATCOM and hybrid DSTATCOM using this JLMS controller are showcased for harmonics curtailment, power factor (p.f.) improvement, load balancing, voltage regulation, etc. Simulation results on an SVC Hybrid DSTATCOM have shown an acceptable level of performance under unbalanced loading situations. Finally, some comparative results are provided to validate the feasibility and effectiveness of the suggested topology.

4

VSC-Based DSTATCOM for PQ Improvement: A Deep-Learning Approach

Mangaraj Mrutyunjaya, Sabat Jogeswara, Barisal Ajit Kumar, Ramaiah K. Subba, Rao Gudivada Eswara

Power Electronics and Drives

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2022

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Vol. 7 (42)

174--186

EN

With the rapid advancement of the technology, deep learning supported voltage source converter (VSC)-based distributed static compensator (DSTATCOM) for power quality (PQ) improvement has attracted significant interest due to its high accuracy. In this paper, six subnets are structured for the proposed deep learning approach (DL-Approach) algorithm by using its own mathematical equations. Three subnets for active and the other three for reactive weight components are used to extract the fundamental component of the load current. These updated weights are utilised for the generation of the reference source currents for VSC. Hysteresis current controllers (HCCs) are employed in each phase in which generated switching signal patterns need to be carried out from both predicted reference source current and actual source current. As a result, the proposed technique achieves better dynamic performance, less computation burden and better estimation speed. Consequently, the results were obtained for different loading conditions using MATLAB/Simulink software. Finally, the feasibility was effective as per the benchmark of IEEE guidelines in response to harmonics curtailment, power factor (p.f) improvement, load balancing and voltage regulation.

5

Performance Evaluation of BB-QZSI-Based DSTATCOM Under Dynamic Load Condition

Mangaraj Mrutyunjaya, Sabat Jogeswara, Barisal Ajit Kumar, Patra Anil Kumar, Chahattaray Ashok Kumar

Power Electronics and Drives

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2022

|

Vol. 7 (42)

43--55

EN

This paper presents the shunt compensation performance of quasi-Z-source inverter (QZSI) and back to back connected QZSIs (BB-QZSI) to address the power quality (PQ) issues in the three-phase three-wire power utility network (PUN). Generally, these PQ issues are poor voltage regulation, low power factor (PF), source current distortion, unbalanced voltage, etc. The proposed BB-QZSI-based distribution static compensator (DSTATCOM) consists of two QZSIs with a common dc-link capacitor. Because the QZSI could achieve buck/boost conversion as well as DC to AC inversion in a single-stage and the back to back configuration decreases the system down time cost (if a fault occurs in one QZSI the other can continue the shunt compensation). Particularly, icosφ control algorithmcontrol algorithm is implemented to generate proper switching pulses for the switches of DSTATCOM. The effectiveness of the BB-QZSI is verified through simulation studies over QZSI using MATLAB/Simulink software satisfying the recommended grid code.

6

Power Quality Enhancement Using DSTATCOM in Industry Plants

Bayu Atinkut

Power Electronics and Drives

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2020

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Vol. 5 (40)

157--175

EN

This paper is focused on increasing the power quality of Unique Macaroni factory, located in Bahir Dar Town. Necessary data have been collected from the factory and the collected data are analysed. Based on the analysis of data, it is found that the factory working power factor is low and hovering around 0.7125. Voltage variations are up to 9.09%, average voltage unbalance is 2.2% and total harmonic distortion (THD) of load currents and voltage are 24.17% and 10.16%, respectively. Harmonic components have existed in the power distribution system of the factory. Based on the analysis of power quality problem in the factory, distribution static compensator (DSTATCOM) and its control system have been designed to boost power quality of the factory and the results are obtained by generating simulations using Matlab software. It is observed from outputs of the Matlab simulations that DSTATCOM can improve the power quality of the factory. Generally, the shape of the waveform of load voltage and current is improved and THD level of load voltage is minimised to 1.55% and load current THD level is 7.09%. The reactive power needed by the loads (442 kVAr) is almost provided by the DSTATCOM, so reactive power from source supply is very small such as 22 kVAr so that the power factor of the source tends to unity.

7

Universal Power Quality Conditioner (UnPQC) for enhancing the power quality in distribution system

Venkatraman K., Kiran Kumar N., Moorthi S., Selvan M. P.

Journal of Power Technologies

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2019

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Vol. 99, nr 3

195--203

EN

This paper proposes a novel custom power device (CPD), called a Universal Power Quality Conditioner (UnPQC), which enhanced the quality of power in a distribution system. UnPQC consists of shunt and series compensators without a common DC link. The series compensator of the presented system, also known as Transformerless Dynamic Voltage Restorer (TDVR), eliminates power quality problems related to voltage without utilizing any injecting transformer. The shunt compensator of the proposed system consists of an improved DSTATCOM (Distribution Static Compensator) topology, which mitigates the current harmonics originating from the nonlinear loads with a reduced DC link voltage. UnPQC is more suitable for applications where weight and size of the CPDs are critical factors. A simulation was carried out to verify and validate the performance of the UnPQC and the results demonstrate superior performance in minimizing voltage and current related power quality problems.

8

Mitigation of voltage unbalance by DSTATCOM in a three phase four wire system

Patel Dhairya, Venkatraman K., Rudraraju Venkata Rama Raju

Journal of Power Technologies

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2019

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Vol. 99, nr 4

237--244

EN

This paper presents a Distribution Static Compensator (DSTATCOM) that uses a traditional Synchronous Reference Frame (SRF) to make source current in phase and sinusoidal shape w.r.t source voltage, so that unity power factor is achieved at source side. In addition to this, a new concept of single phase synchronous d-q reference frame theory is used for generation of reference signals in a three phase distribution system for compensation of voltage unbalances at the load side. Further, this paper uses a traditional hysteresis controller for generation of switching signals for the Voltage Source Converter (VSC). Moreover, switching of DSTATCOM between Current Controlled Mode (CCM) and Voltage Controlled Mode (VCM) is carried out so that only single DSTATCOM serves the problem for current and voltage related Power Quality problems. Simulations are carried out in MATLAB/Simulink environment to validate the proposed scheme and results indicate that the unity power factor is achieved during CCM mode and voltages in all the three phases at PCC are maintained at 1 p.u. during VCM mode.

9

Four Leg DSTATCOM based on Synchronous Reference Frame theory with Enhanced Phase Locked Loop for compensating a four wire distribution network under unbalanced PCC voltages and loads

Chebabhi A., Fellah M.-K., Kessal A., Benkhoris M.-F.

Journal of Power Technologies

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2016

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Vol. 96, nr 1

15--26

EN

This paper presents a Distribution Static Compensator based on Four Leg Voltage Source Inverter (4-leg VSI DSTATCOM) with controlling by Synchronous Reference Frame theory (SRF) in the dq0 frame with Enhanced Phase Locked Loop based on Self-Tuning Filter (EPLL-STF) used for compensating four-wire distribution systems.The proposed 4-leg VSI DSTATCOM is used for load balancing, source harmonics filtering, reactive power compensation and power factor correction, and source neutral wire current compensation at the point of common coupling (PCC) in the four-wire distribution network under unbalanced linear loads and nonlinear load variation with various source and PCC voltages conditions. The new SRF theory with EPLL based on STF is used for harmonics current extraction and good estimation of PCC voltages without harmonics under unbalanced PCC voltages and loads. Three dimensional space vector modulation (3D SVM) is used to generate the gate switching pulses for the 4-leg VSI and to circumvent the problems of the switching frequency variant, and for DC bus voltage capacitor and compensating 4-leg VSI DSTATCOM currents we are going to use the PI controller (Proportional-Integral). The effectiveness of the proposed 4-leg DSTATCOM under unbalanced PCC voltages and loads with various control strategies are demonstrated through simulation using sim-power-system and S-Function integrated in Matlab simulink.

10

Reliability Improvement in Distribution Systems by Optimal Placement of DSTATCOM Using Binary Gravitational Search Algorithm

Salman N., Mohamed A., Shareef H.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 2

295-299

EN

In this paper, a new method for improving reliability level of distribution systems is presented by employing optimal placement of DSTATCOM. The binary version of the Gravitational Search algorithm (BGSA) is used to solve the DSTATCOM optimal placement problem. The simulation results show that the proposed method is efficient and feasible for improving the system reliability level by reducing load outages and momentary interruptions.

PL

Przedstawiono nową metodę poprawy niezawodności system dystrybucji energii dzięki optymalizacji DSTATCOM. Optymalne położenie DSTATCOM było określane na podstawie algorytmu BGSA. Uzyskano [poprawę dzięki dedukcji przerw w obciążeniu i chwilowych zaników.

11

Recovering the voltage dip analysis with STATCOM of DFIG in multi-machine wind farm

Dosoglu M. K., Ozturk A., Poyraz G., Guvenc U.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 10a

166-171

EN

In this study, voltage dip analysis of the wind power plant that is connected to 6 MW Double Feed Induction Generator (DFIG) was performed. During the operation of Multi-machine wind farm that is connected to network adaptation between 10 MVAr STATCOM and system was provided. Purpose of this adaptation, 3-phase fault analysis is to be able and the elimination of problems that may occur with induction motor runstop.

PL

Zaprezentowano analizę spadku napięcia w elektrowni wiatrowej podłączonej do generatorów indukcyjnych 6 MW typu DFIG. Analizę przeprowadzono na przykładzie wielomaszynowej farmy wiatrowej podłączonej do sieci z systemem 10 MVAr STATCOM. (Analiza spadków napięcia w wielomaszynowej farmie wiatrowej z układem STATCOM)

12

Passivity-based Controller Design and Stable Control Region Analysis of the Cascaded DSTATCOM

Xu L., Han Y.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 3b

140-148

EN

This paper proposes a novel passivity-based control scheme for the cascaded H-bridge (CHB) DSTATCOM. The mathematical model of the CHB-DSTATCOM is devised by partitioning the CHB-DSTATCOM into n-block subsystems, and the control algorithm is devised using the adaptive passivity controller. The power balancing mechanism and the stable control region are analyzed using the phasorial diagram representation. The Electromagnetic Transient Program (EMTP) is used for digital simulation, and the Transient Analysis of Control System (TACS) and the MODELS language of the EMTP are utilized for control algorithm implementation. The simulation results of the CHB-DSTATCOM under abrupt dclink voltage variations are provided with comparative evaluations. The devised control scheme of the CHB-DSTATCOM is validated by the simulation and experimental results from the prototype system.

PL

W artykule zaproponowano układ sterowania kaskadowo połączonych systemów DSTATCOM biorąc pod uwagę składowa bierną mocy. Mechanizm równoważenia mocy i sterowanie stabilnością są analizowane na podstawie reprezentacji fazora.

13

Effect of DC Capacitor Size on D-STATCOM Voltage Regulation Performance Evaluation

Hannan M. A.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 12a

243-246

EN

This paper describes the modelling and simulation of distribution static compensator (D-STATCOM) focused with effect of DC capacitor size and voltage regulation. Different capacitor values have been investigated to reduce the load ripple voltage during the charging and discharging of the capacitor. The optimum capacitor valuse has been determined to obtained the lowest ripple voltage within the rage of 8%. Capacitive and inductive mode of D-STATCOM operation have been also investigated and obtained results proved that the capability of the D-STATCOM in regulating the system voltage is near to the rated value of 1.0 p.u.

PL

W artykule przedstawiono sposób budowy modelu i symulacje kompensatora pasywnego D-STATCOM, ze naciskiem na analizę wpływu pojemności kondensatorów oraz regulacji napięcia na jego działanie. Badania wykonano dla różnych pojemności i wyznaczono optymalną, zapewniającą najmniejsze wahania napięcia (w zakresie 8%). Analizie poddano działanie kompensatora przy charakterze pojemnościowym i indukcyjnym.

14

D-STATCOM Pulse Selection and Transformer Configuration for Harmonic Elimination

Hannan M.A.

Przegląd Elektrotechniczny

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2012

|

R. 88, nr 11a

210-213

EN

The sensitive industrial loads and critical commercial operations suffer from harmonics problems which can cost significant loss per incident based on process down-time, loss production, idle work forces and other factors. To overcome such problems, utility companies have made efforts to improve the quality and reliability of their electric power by introducing distribution static compensator (D-STATCOM). However, up to now, many research are going on D-STATCOM control scheme, suitable pulse and transformer design, dc capacitance effect and involvement with many power quality problems. This paper deals with the modelling and simulations of D-STATCOM model focus with the pulse selection, transformer design configuration and test distribution system. The issue of harmonics in the D-STATCOM is addressed by considering a 24-pulse so as to eliminate the generated harmonics. The harmonics eliminating performance of the D-STATCOM in 12-pulse, 24-pulse and 48-pulse are also investigated.

PL

W artykule opisano budowę modelu i symulacje kompensatora statycznego D-STATCOM. Przedstawiono zagadnienie liczby pulsów, konfiguracji transformatora oraz przeprowadzono testy systemu energetycznego. Analizie poddano zagadnienie eliminacji wyższych harmonicznych w układach 12-, 24- oraz 48-pulsowym.

15

Power balancing control strategies for the cascaded H-bridge multilevel DSTATCOM

Han Y., Xu L., Mansoor Khan M., Chen Ch.

Przegląd Elektrotechniczny

|

2011

|

R. 87, nr 2

212-219

EN

This paper proposes a novel power balancing control scheme for the cascaded H-bridge (CHB) DSTATCOM. The principle of the carrier phase-shifted pulse-width modulation (CPS-PWM) and the mathematical model of the CHB-DSTATCOM are presented. The power balancing mechanism and the stable control region are analyzed using the phasorial diagram representation. The current loop controller is designed by using root locus approach, and the dc-link voltage balancing controller is synthesized based on the devised power balancing mechanism. The simulation results obtained from the alternative transient program (ATP) are presented and evaluated. The validity and effectiveness of the control scheme is confirmed by the simulation and experimental results.

PL

Zapropnowano nową metodę równoważenia mocy w kaskadowym H-mostkowym SSTATCOM. Zaprezentowano zasadę modulacji przesunięcia fazowego i szerokości impulsu CPS-PWM i model matematyczny CHB-DSTATCOM. Równoważenie mocy i analiza stabilnego sterowania zostały przeprowadzone przy użyciu diagramu fazowego. Kontroler pętli prądowej został zaprojektowany przy użyciu obwiedni pierwiastkowej a kontroler napięcia dc-link jest syntetyzowany na podstawie balansu mocy. Przedstawiono symulowane rezultaty. Symulacje i eksperymenty potwierdziły skuteczność metody.