Application Of STATCOM Research Articles

Study for Improving Voltage Magnitude in transmission line and Application of STATCOM

Study for Improving Voltage Magnitude in transmission line and Application of STATCOM

Improvement of energy quality through the application of BtB STATCOM in a power system

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Stability assessment and robust controller design of grid interactive offshore wind farm and marine current farm with STATCOM and BFCL

ABSTRACT In the context of larger renewable energy harnessing, combining offshore wind farm (OWF) and marine current farm (MCF) at the same location is often found suitable in terms of geographical conditions and economic reasons. However, stochastic nature of wind speed and marine current speed with increased penetration level significantly affects the system stability, grid voltage and raises some control and stability problem; furthermore, the parametric uncertainty of generators brings additional challenges under grid voltage distortion. Therefore, in this article, we present a consolidated application of STATCOM and BFCL in the context of stability assessment of integrated system. Consequently, a robust H∞ loop-shaping controller has been proposed in the presence of parametric uncertainties. In this context, optimizing controller performance with respect to the undesired parametric uncertainties and external disturbances has been proposed. The control effort is initiated by formulating the robust H∞ loop-shaping controller in the context of evaluating the controller parameters and gain with respect to desired robust stability margin. The efficacy of the proposed control scheme is measured through different case studies in real time digital simulation (RTDS) environment. The comparative analysis of simulation results demonstrates the effectiveness of the proposed control strategy in the context of integrated system stability and reliability.

Integration of STATCOM and ESS for power system stability improvement

The power system enters a state of voltage instability due to the inability of the power system to meet the demand for active power and reactive power due to the increase of system load. In order to stabilize the power system, the installation of STATCOM and ESS needs to be performed. The main objective of this study is to identify the suitable size and location of STATCOM and ESS for power system stability improvement. First, the IEEE 14 bus system was simulated using DIgSILENT software in ideal condition. Then, the system loadability was increased up to 200% of initial value to locate the weakest bus. This study includes the applicable location and sizing of STATCOM and ESS towards improving power system stability. The results showed that the application of STATCOM and ESS with the most reliable size can increase the bus voltage (p.u and kV) of IEEE 14 bus system thus improving the power system stability. For recommendation, the power system stability can be improved by installing multiple STATCOM and ESS at other load buses and applying a controller to both STATCOM and ESS to improve the effectiveness of generating and absorbency of active and reactive power in the power system.

Analysis of squirrel-cage induction generator start-up supported by reactive power compensator

PurposeThe power electronic converter is used for the satisfaction of reactive power demand of induction generator, when grid-tied. This paper aims to present an application of STATCOM to reduce inrush transient caused by the connection of a squirrel-cage induction generator (SCIG) to the grid.Design/methodology/approachThe power generation system consists of an uncontrolled prime mover, a SCIG and a power electronic converter connected to the grid. The three-phase Neutral Point Clamped (NPC) converter works as a STATCOM to satisfy a reactive power demand of the generator. A control scheme of STATCOM uses the x-y reference frame rotating synchronously with grid voltage vector and the p-q instantaneous power theory to calculate q component of grid power.FindingsIt is shown that the parallel converter, which works as a reactive power compensator allows decreasing transients during a grid connection of the induction generator.Research limitations/implicationsTransients during a grid connection of the induction generator are only partially decreased.Practical implicationsIt is needed to compensate for the reactive power of a SCIG. The NPC converter works as a STATCOM. The converter partially reduces grid transients during generator connection. The laboratory tests are demonstrated by connection 7.5 kW induction generator to 8 kVA transformer.Originality/valueThe paper presents the mitigation of grid transients during connection of induction generator with the power electronic converter working as reactive power compensator.

Application of STATCOM in Renewable Energy Sources for Power Quality Improvement

Application of STATCOM in Renewable Energy Sources for Power Quality Improvement

Application of STATCOM to an Industrial Distribution System Connected to a Weak Utility System

Application of STATCOM to an Industrial Distribution System Connected to a Weak Utility System

Power Quality Issues in Variable Speed Wind Turbine and Application of STATCOM

Power Quality Issues in Variable Speed Wind Turbine and Application of STATCOM

Transient Stability and Voltage Regulation in Multimachine Power Systems Vis-à-Vis STATCOM and Battery Energy Storage

This paper examines the application of STATCOM and battery energy storage to enhance the transient stability of large-scale multimachine power systems with synchronous and doubly-fed induction generators (DFIGs). A passivity-based control design method [interconnection and damping assignment passivity-based control (IDA-PBC)] is developed for multimachine power systems and its performance is evaluated on a two-area system consisting of two synchronous generators (SGs) and two DFIG along with STATCOM/battery energy storage system. The main contributions of this paper are threefold: 1) use of a STATCOM and battery energy storage system to enhance transient stability and provide voltage regulation with SG and DFIG; 2) demonstrating the application of nonlinear control theory (specifically the IDA-PBC methodology) for the design of a stabilizing feedback controller in large-scale power systems to improve transient system performance; and 3) developing a methodology that can use the additional degrees of freedom in large-scale power systems in order to further improve system performance, in particular the transient stability margin [measured through critical clearing time (CCT)] and the dynamic transient performance of the system. In order to achieve power angle stability along with the simultaneous regulation of frequency and voltage, the performance of the proposed control scheme after the occurrence of large disturbances is evaluated and compared with a conventional power system stabilizer and a feedback linearizing controller.

Carrier Level Layered Modulation Method can Filter Out the Harmonics of Cascaded H - Bridge Topology

Analysis of the reason of cascade H-bridge inverter topology using carrier phase shift modulation method cannot compensate the harmonic, using carrier level layered modulation method can solve the problem of cascade H-bridge topology that it cannot compensate harmonic problems. Experimental results show that the modulation algorithm can effectively reduce the modulation delay, improve the control bandwidth, it can also make the harmonic compensation capacity increase from 5 times to 21. The scope of the application of STATCOM is greatly increased in the grid.

Comparison of Application of SVC and STATCOM on Suppressing Subsynchronous Oscillation

As the main types of parallel FACTS devices, the basic function of SVC and STATCOM is to realize the dynamic compensation of reactive power and maintain system voltage stability. However, when new control strategies are added to them .Both of them can suppress SSO effectively. Based on IEEE first benchmark model, this paper established simulation model by PSCAD/EMTDC. The effects of suppressing SSO by SVC/STATCOM are verified with time domain simulation, and the comparative analyses are carried out on the effects of suppressing SSO by SVC and STATCOM.

Optimal Configuration of Dynamic Reactive Power Compensation for Large Petrochemical Enterprise Grid

Considering different kind of external grid failures, this paper gives analysis of voltage fluctuation and flicker of large petrochemical enterprise grid. Trajectory-based time-domain dynamic simulation method is used to analyze problems of transient voltage security. A strategy for the application of STATCOM is proposed in order to improving electric power quality. The total loss of motor load of the whole system is counted and buses are sorted according to sensitivity analysis to ascertain installing sites of STATCOM. Then the optimal capacity of STATCOM can be gained by the way of solving linear programming model,which is suitable for transient voltage security under multi-faults. Test simulations show very encouraging result.

Application of STATCOM in Eliminating Subsynchronous Resonance in Power Systems

In this paper, a STATCOM is used to damp the subsynchronous oscillation in power systems with long transmission lines compensated by series capacitors. By using a new auxiliary subsynchronous damping controller (SSDC), the STATCOM connected at the transmission line is able to damp the subsynchronous resonance (SSR) caused by disturbances. The torsional modes characteristics of the system are investigated in this paper and a new design method is proposed for the SSDC based on a nonlinear optimization to suppress the torsional modes in a wide range of operating conditions. A proper stabilizing signal is chosen for the SSDC input in order to modulate the reactive current reference of STATCOM in the torsional modes. The IEEE second benchmark is used to study the SSR. The eigenvalue and FFT analysis as well as the transient simulation are used to demonstrate the ability of STATCOM with the proposed SSDC in damping the SSR.

Application of STATCOM for Damping Subsynchronous Resonance in a Multi-machine System

Results of an investigation on the application of STATCOM for damping subsynchronous resonance (SSR) in a multi-machine system is presented in this paper. For a multi-machine system which has a set of identical parallel turbine-generators or non-identical turbine-generators having torsional modes of the same frequency, generators may suffer from the same mode of torsional interaction corresponding to a certain series compensation degrees. Generators in such system may have different oscillation behaviors when they are unequally loaded or have different shaft and electrical parameters. Serving as the grid-side equipment, the reactive power output of a STATCOM could have an impact on all generators electrical distance nearby. Thus a single STATCOM could be used to damp torsional interactions of multi-generators when additional proper control strategy is supplemented. In this paper, control strategy of using STATCOM to damp SSR in a multi-machine system is designed and its effectiveness is validated based on a modified IEEE second benchmark model.

Application of STATCOM to Increase Transient Stability of Wind Farm

In this paper we interested to the study the necessary of Facts to increase the transient stability on the presence of faults and the integration of new renewable source, like wind energy, these lasts make the electrical grid operate in a new conditions, the STATCOM is one of the important Facts element, It provides the desired reactive-power generation and absorption entirely by means of electronic processing of the voltage and current waveforms in a voltage source converter (VSC). This function is identical to the synchronous condenser with rotating mass. In present work we propose a transient stability improvement using STATCOM under faults, in the first time we study the transient stability with and without STATCOM for clearly his advantages. In the second time we know the relation between the reactive power injecting by a STATCOM and the critical clearing time, some simulation results are given, commented and discussed.

Integrating STATCOM and Battery Energy Storage System for Power System Transient Stability: A Review and Application

Integration of STATCOM with energy storage devices plays an imperative role in improving the power system operation and control. Significant research has been done in this area for practical realization of benefits of the integration. This paper, however, pays particular importance to the performance improvement for the transients as is achievable by STATCOM with battery-powered storage systems. Application of STATCOM with storage in regard to intermittent renewable energy sources such as wind power generation is also discussed in the paper. At the beginning of this paper, an overall review of the STATCOM and energy storage systems are elaborated. A brief overview of the advantages of using STATCOM in conjunction to energy storage systems in achieving power system stability is presented. In the second part of the paper, a typical transient stability model of a STATCOM is presented. The dynamics of real and reactive power responses of the integrated system to transients is studied. The study is aimed at showing that the combination of STATCOM and battery energy storage significantly improves the performance of the system. The final results show that the STATCOM reactive power/voltage control helps in transient stability enhancement.

Multi-level Inverters and Its Application of Statcom Using Svpwm and Spwm Techniques

Power quality in distribution system has been the major issue now-a-days. Utility distribution networks, sensitive industrial loads and critical commercial operations suffer from various types of power quality problems like voltage sag, service interruptions total harmonic distortion (THD) etc. A voltage dip is a short time (10 ms to 1 minute) event during which a reduction in r.m.s voltage magnitude occurs.. Multi-level inverters are the best form to solve these problems. The general structure of multilevel inverter is to synthesize sinusoidal voltage waveform from several levels of voltages typically obtained from capacitor voltage source. In this paper both the Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) techniques are employed for the 3-level multi inverter and both these techniques are compared along with the application of STATCOM. All the results are studied through MATLAB Simulink by designing a 10KV, 400V, 50Hz system by applying 3-Ф to ground fault using RL load. Keywords: Multi-level inverter, SPWM technique, SVPWM technique, STATCOM, Total Harmonic Distortion (THD).

Comparison of artificial intelligence strategies for UPFC supplementary controller design

This paper presents the application of STATCOM to enhance damping of Low Frequency Oscillations at a single-machine infinite-bus power system installed with a STATCOM as cast study. Since STATCOM has been considered to damping of Low Frequency Oscillations, therefore the supplementary damping controller based STATCOM like power system stabilizer is designed to reach defined purpose. Artificial intelligence methods like Fuzzy Logic schemes and Genetic Algorithms optimization are considered to design STATCOM supplementary damping controller. To show effectiveness and also comparing these two methods in damping of power system oscillations based STATCOM, the proposed methods are applied and simulated. Several linear time-domain simulation tests visibly show the validity of proposed methods in damping of power system oscillations. Also Simulation results emphasis on the better performance of Fuzzy method in compare with GA method. Simulations are carried out in MATLAB.