The paper presents a systematic mathematical approach for designing a regulator for a STATCOM connected to a multimachine power system for improving the voltage profile during different operation conditions. The paper addresses the need for redefining the controller and generating a control signal to effectively allow the STATCOM to react with higher reactive support during dynamic disturbances. An auxiliary wide area damping controller is also proposed to supplement a fixed structure controller for the proposed STATCOM to improve the angular stability of the selected power system. The input signals for the proposed controllers are selected from the network parameters with highest participation factor to damp out the local modes of oscillations. The effectiveness of the proposed scheme is tested on IEEE 12 bus system and compared with conventional STATCOM control scheme.
The purpose of this research is to develop an efficient single-phase grid-connected PV system using a better performing asymmetrical multilevel inverter (AMI). Circuit component reduction, harmonic reduction, and grid integration are critical criteria for better inverter efficiency. The proposed inverter’s optimized topology requires seven unidirectional switches, three symmetric dc sources, and three diodes to produce an asymmetric fifteen level output; whereas, the same configuration will generate 7, 11, and 15-level output with an appropriate choice of dc source magnitudes. It is possible to reduce inverter losses and boost efficiency by decreasing the number of switches used. The integration of an asymmetric 15-level inverter with a grid-connected solar photovoltaic system is discussed in this article. A grid-connected solar photovoltaic (GCSPV) system is modelled and simulated using an asymmetric 15-level inverter. The dc sources of the 15-level inverter are replaced with PV sources. The results were analyzed with different operating temperatures and solar irradiance conditions. The GCSPV system is controlled by a closed-loop control system using Particle Swarm Optimization (PSO), Harris Hawk Optimization (HHO), and Hybrid Particle Swarm Optimization-Genetic Algorithm (PSOGA) based Proportional plus Integral (PI) controllers. Grid voltage, grid current, grid power, and total harmonic distortion (THD) of grid currents were analyzed. The performance of the 15-level asymmetric inverter was evaluated by comparing the THD of the grid current and the efficiency of the grid-connected photovoltaic system.
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