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This paper presents a voltage and frequency controller with neutral current compensation in an isolated wind energy conversion system employing a capacitor excited asynchronous generator (CEAG). In isolated applications, because of unavailability of the neutral point at the generator terminals, it is difficult to access the neutral wire from the source. In view of this, a transformer integrated with...
In this paper, a new topology of DSTATCOM (Distribution Static Compensator) is proposed consisting of a two-leg VSC (voltage source converter) and a zig-zag transformer for power quality improvement in three-phase four-wire distribution systems. The DSTATCOM along with a zig-zag transformer is employed for the compensation of reactive power for the voltage regulation or power factor correction along...
In this paper, different voltage injection schemes for dynamic voltage restorers (DVRs) are analysed with particular focus on the methods used to minimize the rating of the voltage source converter (VSC) used in DVR. The control and operation of a DVR is demonstrated with reduced rating VSC. The reference load voltage is estimated using the unit vectors and the synchronous reference frame (SRF) theory...
The static synchronous compensator (STATCOM) being the state-of-the-art voltage source converter (VSC) based dynamic shunt compensator in FACTS family (flexible alternating current transmission system) is increasingly employed in transmission system for reactive power control, increase of power transfer capacity, voltage regulation etc. Utilization of such controller at the middle location of the...
The dynamic voltage restorer (DVR) is used to regulate the voltage at the load terminals from various power quality problems like sag, swell, harmonics, unbalance etc., in supply voltage. In this paper, a novel control strategy is proposed to control a capacitor supported DVR for sag, swell, harmonics and unbalance in supply voltage. The reference signal for the series connected DVR is obtained indirectly...
This paper presents an investigation on a voltage and frequency controller (VFC), which functions as an improved electronic load controller (IELC) for parallel operated isolated asynchronous generators (IAGs) in an autonomous micro hydro power generation system. In such type of micro hydro scheme whole generating system is isolated from the grid and supply electricity to the remote communities. The...
This paper deals with a voltage and frequency control of an isolated asynchronous generator feeding 3-phase 4-wire loads in constant power applications where terminal voltage, excitation capacitor, speed and generated power of the generator remain constant under all operating conditions. The proposed controller functions as an improved electronic load controller (IELC) to regulate the frequency and...
In this paper, a new three-phase four-wire distribution static compensator (DSTATCOM) based on a T-connected transformer and a three-leg voltage source converter (VSC) is proposed for power quality improvement. The T-connected transformer connection mitigates the neutral current and the three-leg VSC compensates harmonic current, reactive power, and balances the load. Two single-phase transformers...
This paper deals with a voltage and frequency controller for parallel operated isolated asynchronous generators used in constant power applications such as driven by uncontrolled pico hydro turbines. The proposed controller is having capability of controlling the voltage and frequency in decoupled manner. For controlling the voltage, a static compensator (STATCOM) is used as a reactive power compensator...
This paper deals with a battery energy storage system (BESS) based voltage and frequency (VF) controller for parallel operated isolated asynchronous generators (IAGs) driven by uncontrolled pico hydro turbines used in constant power applications. The individual AC capacitor banks are used to generate the rated voltage at no load while additional demand of reactive power for the load and generators...
This paper deals with a solid state voltage and frequency controller for an isolated wind energy conversion system (WECS) based on capacitor excited asynchronous generator (CEAG) and feeding an induction motor load. The proposed voltage and frequency controller consists of an IGBT (insulated gate bipolar junction transistor) based voltage source converter along-with battery energy storage system (BESS)...
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...
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...
This paper presents an approach to control the power flow and regulate the DC voltage at the DC link of voltage source converter (VSC) based high voltage DC (HVDC) transmission system. Two identical converters used at both rectifier and inverter ends. The switching of the converter is carried out at fundamental frequency switching. The power flow between the two stations is controlled by controlling...
This paper presents the operation of battery energy storage system (BESS) with diesel generator (DG) set. The performance of the DG set is observed best when operated at full load or near full load (up to 70-80% load) condition. For this purpose a BESS is employed which ensures the load on the generator remains in between 80% to 100% of full load. Under light load condition (load less than 80%) the...
Multi-pulse gate turn-off thyristor based voltage source converter (GTO-VSC) topology having a number of 6-pulse VSCs as elementary unit together with fundamental frequency mode of GTO gate control are widely used in STATCOM for dynamic reactive power compensation in electrical network. A 12-pulse topology generally produces an AC output voltage waveforms which contain 11th, 13th, etc. harmonics and...
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