Model Predictive Current Control with Asymmetric Stacked Multilevel Inverter and LCL-Filter Based STATCOM (original) (raw)
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ENHANCING POWER QUALITY BY COMPENSATING REACTIVE POWER USING MULTILEVEL STATCOM
TJPRC, 2014
Flexible AC t ransmission systems (FACTS) has become the technology of choice in voltage control, reactive/active power flow control, t ransient and steady-state stabilization that improves the operation and functionality of existing power transmission and distribution system. Static synchronous compensator (STATCOM) is one of the new-generation FACTS devices, and recognized to be one of the key technologies in future power system because of the instantaneous compensating of voltage from it to the transmission line or vise versa. This study explains the design of a cascaded mult ilevel STATCOM with the necessary controllers and equipment’s to compensate the reactive power of A C transmission line system. The cascaded multilevel STATCOM is a mult ilevel voltage source converter based static synchronous compensator (STATCOM). This technique is performed in a MATLAB Simulink environment. The new strategy of compensation is proposed to decrease the voltage fluctuation such as sag and swell. Also the voltage harmonics in the transmission system is isolated. The cascaded multilevel STATCOM can be used in a point of common coupling (PCC) for improving power quality. It is modeled and simulated using proposed control strategy and the performance is compared by applying it to a 133kv line with and without STATCOM. Harmonic analysis is also proved in this study and based on the total harmonic distribution (THD) calculations.
A Three-Level Inverter Based Static Compensator (STATCOM)
European Journal of Electrical Engineering and Computer Science
In an electric utility network, the occurrence of voltage depression on transmission and distribution lines is due to the flow of reactive power. It is desirable to regulate the voltage within a narrow range of its nominal value (±5% range around their nominal values). Thus, reactive power control is necessary so as to control dynamic voltage swings under various system conditions and thereby improve the power system transmission and distribution performance. A fast acting Static Compensator (STATCOM) is required to produce or absorb reactive power so as to provide the necessary reactive power balance in transmission and distribution system. Modern reactive power compensation employs voltage source inverter (VSI). In this paper, a static compensator based on three-phase, three-level voltage source inverter (VSI) was investigated. The paper is intended to show how this STATCOM can be used to improve the ac system power factor and voltage regulation, and hence improve the performance ...
Design of STATCOM for reactive power control using multilevel inverter
2020
View the article online for updates and enhancements. You may also like Two methods for damping torsional vibrations in DFIG-based wind generators using power converters Zuyi Zhao, Yupu Lu, Da Xie et al.-Small-Signal Dynamic Analysis of LCC-HVDC with STATCOM at the Inverter Busbar Dong Liu, Wen Jiang, Chunyi Guo et al.-Voltage profile improvement analysis during the loss of transmission lines on 150kv subsystem using static synchronous compensator H Ali, A Rahardjo, A Setiawan et al.
IEEE Transactions on Power Electronics, 2015
This paper presents a simple controller integrating a new reactive current reference algorithm for enhancing the transient performance of Static Synchronous Compensator (STATCOM). Multilevel cascaded inverter with separated DC capacitors which is driven by carrier based pulse width modulation (CB-PWM) is used to implement the STATCOM. The voltage across each DC-link capacitor is regulated by the rotated switching swapping scheme. In this work, the STATCOM is controlled to provide both reactive power (VAR) compensation and grid power factor (PF) correction at the point of common coupling (PCC) with a dynamically varying reactive load system. The proposed algorithm enhances the transient performance of the closed-loop system with only proportional controller and minimizes the STATCOM reactive current ripples. STATCOM based on a five-level cascaded inverter is presented in this work and the performance of the proposed controller is investigated through various simulation studies using MATLAB/SIMULINK software for both steady state and transient conditions. A laboratory prototype is also developed to verify the simulation results where a good match between simulation and experimental results is achieved. Index Terms-Cascaded H-bridge inverter; carrier-based pulse width modulation, STATCOM; reactive power (VAR) compensation, power factor correction. I. INTRODUCTION Power quality and efficiency issues arising from unmanaged power flow, which include low power factor (PF), voltage collapse, unbalance, excessive harmonics, transients and oscillations, have been a major concern in power transmission and distribution systems. Reactive loads, which naturally possess low PF, draw excessive reactive power (VAR) restricting the maximum active power transfer and moreover, adding losses to the power transmission and distribution systems [1]. Furthermore, voltage variations or disturbances such as voltage sags/swells, which is caused by low PF loads, hard switching, lightning, and sudden increase/decrease in the loading conditions, will challenge the tolerance level of electrical equipment in terms of stability and reliability [2]. Therefore, it is essential to improve the voltage stability of power system networks under
Comparison of Multilevel Inverter Topologies for STATCOM Applications
In this paper is to present an comparison of four different STATCOM multilevel inverter topologies which are suitable to be connected to the un-linear loads and unbalancing loads. The majority of power consumption has been drawn in reactive loads. These loads are drawn in low power factor and therefore give rise to reactive power burden in the power system. So that STATCOM controller is used to compensate reactive power, correction of power factor and elimination of current harmonics. This paper mainly focuses the analysis issues of the Cascade H-bridge, Incremental cascade H-bridge, Incremental cascade I-bridge and Incrementalreduction cascade H-bridge multilevel topologies with PWM technique for STATCOM applications; Inverter operation play a vital in STATCOM, presenting a methods for best suitable in the point of low THD, better output, cost and efficiency. MATLAB/SIMULINK results are present in this paper of multilevel inverter four topologies for STATCOM applications with Instantaneous pq theory controller implemented.
2021
The voltage source converters are to be designed with higher capacity for the purpose of maintaining the voltage profile constant by means of shunt compensators especially in distribution systems of medium voltages. Yet, designing converters of large rating imposes restrictions with respect to the stress and uniform distribution of stress in various devices is quite challenging in multi-level topology. The structure of cascaded arrangement of such inverters is very simple and expandable compared to other existing designs. This investigation aims to provide active filtering by the use of cascaded VSC particularly for 5-level and 7-level in distribution circuits for enhancing the quality of power. For experimental analysis a nonlinear rectification load using diodes (NLDRL) is considered and to abolish the Total Harmonic Distortion (THD) as well as to get a fairly reasonable power factor, the DSTATCOM (Distribution Static Compensator) is being used. The principal theory associated in the compensating process is the p-q philosophy. For validating the entire design by means of simulation MATLAB package is chosen.
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2019
This paper deals with the operation of a cascaded H-bridge (CHB) converter-based STATCOM under unbalanced grid conditions. Degrees of freedom and operational limitations of the CHB STATCOM during unbalanced grid condition are analyzed according to the converter power flow equations. Based on this analysis, an improved low-voltage ride-through (LVRT) strategy for the CHB STATCOM is proposed. In this strategy, the grid operator can control both the positive-and negativesequence reactive currents independently within the operation range of the CHB STATCOM. In addition, to keep the submodules' capacitors voltages balanced, a zero-sequence voltage term is injected to the converter legs. The negative-sequence active current is also controlled to limit the injected zero-sequence voltage and keep the converter within the rated operation range. The performance and effectiveness of the proposed method are validated through PSCAD/EMTDC simulation of a 21-level CHB STATCOM. The results are experimentally demonstrated on a 9-level CHB STATCOM prototype. Index Terms-Cascaded H-bridge (CHB) converter, lowvoltage ride-through (LVRT), STATCOM. I. INTRODUCTION S TATCOM is a power electronics based-shunt device used to provide fast and dynamic reactive power compensation [1]-[3]. It is widely used in the power system for reactive power control and voltage regulation [4]-[7]. The importance of STATCOM has been increasing due to the high penetration of renewable energy sources like wind and photovoltaic power plants in recent years. Recent advances Manuscript
D-Statcom Based on Three Level NPC Converter and its Application in Reactive Power Compensation
This paper deals with multilevel Neutral Point Clamped (NPC) converter voltage source inverter applied as D-STATCOM. The proposed control with Space Vector Modulation (SVM) switching and decoupled current control with (IP) controllers have been tested to prove the advantages of the proposed control. The effectiveness and validity of the controller system is supported by computer simulation. Simulation results obtained, confirm that the controller has a very good performance, allowing compensation of capacitive or inductive. The simulation of the proposed system is developed using MATLAB, Simulink. Keywords— Neutral Point Clamped Converter; Multilevel Inverter; IP controller; Space Vector Modulation I. INTRODUCTION Benefits of reactive power compensation are well known: increased stability, increased transmission capacity over existing lines, better voltage profile and decreased losses. The management of reactive power by traditional means has its drawbacks, depending on compensation...
Harmonic Mitigation using D STATCOM through a Current Control Technique
Journal 4 Research - J4R Journal, 2016
The harmonic mitigation using shunt active filters are most widely used in industrial and commercial applications. In this paper a Multi-Level Inverter is considered as DSTATCOM to compensate harmonics. The mathematical modeling of the system and design of the controller using synchronous reference frame theory is also presented. The nonlinear load generally known as diode rectifier load and an unbalanced load is simulated with the system using MATLAB/SIMULINK.