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This paper deals with investigation on the performance of voltage and frequency controller (VFC) of a wind power generation using a capacitor excited isolated asynchronous generator (IAG) feeding dynamic loads. The amplitude of load currents is estimated using the low pass filter to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC) with a battery energy storage...
This paper deals with the design and development of fuzzy logic based controller for Distribution Static compensator (DSTATCOM) applied to an isolated system. The controller is developed and simulated for a small diesel generator system feeding a variety of linear as well as non-linear loads. Fuzzy rules are developed and successively reduced at every step such that controller design is simplified...
Load modeling, estimation and forecasting are vitally important for power utilities both in regulated and deregulated economy. The price of power that power utilities have to procure for meeting their customers' demand on long term basis versus the day ahead or real time basis under unscheduled interchange mechanism has fluctuated wildly. Sometimes the variation has been even ten times the long term...
In this paper, a new control strategy based on current mode control for dynamic voltage restorer (DVR) is proposed to mitigate the power quality problems in the supply voltage. The DVR is controlled indirectly by controlling the supply current. The reference supply currents are estimated using the sensed load terminal voltages and the dc bus voltage of DVR. The control scheme is based on synchronous...
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...
Distribution system has witnessed numerous problems due to concentrated power loading in cities. Stability, reliability, peak demand, poor power quality, unbalanced loading are some of the major issues besides handling of large AC networks. This paper proposes an insertion of DC power dam connected between transmission and distribution system, through bidirectional voltage source converter (VSC) both...
This paper deals with different control strategies for DSTATCOM (distribution static compensator) for power quality improvement for a three-phase, three-wire distribution system. A three-leg voltage source inverter (VSI) configuration with a dc bus capacitor is employed as DSTATCOM. The hysteresis as well as PWM current controllers are designed, analyzed and compared for PI controller and sliding...
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...
This paper presents a T-connected transformer based 24-pulse AC-DC converter for low-voltage, high current applications. The design of a 12-pulse AC-DC converter is carried out and it is modified to a 24-pulse AC-DC converter by pulse multiplication technique. It improves the power quality at AC mains to meet IEEE-519 standard at varying loads. To demonstrate the advantage of proposed converter in...
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