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This paper deals with the design, analysis and simulation of neural network based DSTATCOM controller. Conventional controllers being fixed structure provide optimum performance only over a limited range of operating conditions for which they are designed. Alternate controllers based on fuzzy logic and neural networks are more robust and can be designed to operate well under a wide range of operating...
This paper presents the simulation studies on a cascaded H-bridge converter based distribution static synchronous compensator (DSTATCOM) for improving the power quality of a distribution system. Voltage source converter based DSTATCOM has been established as the most preferred solution for management of reactive power in distribution utilities and for improving voltage regulation, power factor and...
This paper presents an analysis of three-phase self-excited induction generator (SEIG) with static compensator (STATCOM) as a voltage regulator. Current controlled voltage source inverter is used as STATCOM, which provides fast dynamic response to maintain constant voltage at SEIG terminals during severe load perturbation and acts as a source or sink of reactive power. The dynamic model of SEIG is...
In this paper, a simple and efficient algorithm for incorporating STATCOM losses in the load flow calculation is proposed. In this technique, both the STATCOM switching loss and the step-down transformer ohmic loss are accounted for and are calculated iteratively. To reduce the computational burden, the system load flow equations and the STATCOM equations are solved separately. The proposed algorithm...
This paper presents the control of distribution static compensator (DSTATCOM) for reactive power, harmonics and unbalanced load currents compensation on diesel generator (DG) set for isolated system. The control of DSTATCOM is achieved using least mean square (LMS) based Adaline. The Adaline is used to extract the balanced positive sequence real fundamental frequency component of load current and...
In this paper, a static synchronous series compensator (SSSC) is used to avoid torsional mode instability in a series compensated transmission system. The power system used in this study is the IEEE first benchmark model for sub-synchronous resonance (SSR) analysis. Simulation results in time domain using PSCAD/EMTDC presented and discussed.
To improve the quality of electrical power to the consumers, many power electronic based solutions are available. In the case of active power factor compensation, grid tied voltage source inverter based STATCOM is one of the versatile solution. But in this system most of the control strategies demand generation of unit vector, based on the grid voltage for vector orientation. But presence of harmonics...
This paper presents the theory of a new VAr regulator used for voltage control of self excited induction generators (SEIG). In this approach the excitation capacitors of each phase are switched individually by IGBTs at the zero crossing of respective capacitor currents, thereby eliminating switching losses and harmonics and reducing component count. Simulation results using Matlab-Simulink are presented...
A 1 kWp (peak kilowatt) grid connected photovoltaic (PV) interface is presented. The main functions of that interface are shunt active filtering and VAR compensation of nonlinear load. The controller algorithms are based on maximum power point tracking (MPPT). The indirect current control technique is used. The Matlab simulation shows the validity of the control strategy under environmental and load...
This paper presents an investigation on transient stability of power systems equipped with a flexible alternating current transmission system (FACTS) device. A static synchronous series compensator (SSSC) is considered as a FACTS device. In a power system transmission, the SSSC has two functions; first, it compensates reactive power, second, it improves transient stability. The second functionality...
This paper is focused on design and modeling of a new fundamental frequency switching based 24-pulse 2-level plusmn100 MVAR STATCOM in Matlab platform for high power applications. Only four 6-pulse elementary gate turn off voltage source converters (GTO-VSC) along with single stage magnetics meeting dual objectives of magnetic summing circuit and coupling transformer at PCC, and PI-controllers employing...
The paper explains the power quality study conducted in a 4 MW mini steel plant, having fault level of 250 MVA, to investigate the critical electrical problems caused by the harmonics and the development of a STATCOM as a solution for harmonic mitigation. A 500 Kvar STATCOM is realized with a current controlled three level voltage source converter (VSC). The hardware configuration and the control...
In a power distribution network of a power utility or industry, the reactive power management plays a major role in reducing distribution loss and maintaining constant distribution voltage. Voltage source PWM inverter based reactive power generator has fast response to reactive power demand and hence can be used for power factor improvement and voltage support. With the availability of new generation...
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