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An isolated interleaved boost converter (IIBC) based single-phase grid-interfaced photovoltaic system (SPGIPS) and its control are proposed in this article. The proposed double-stage SPGIPS consists of an IIBC and a single-phase full bridge voltage source converter (SPFBVSC). An IIBC is designed using a high-frequency transformer (HFT), two primary inductors, and two static switches with its emitter shared with photovoltaic (PV) panel ground. Shared emitter terminal reduces the gate control circuit complexity and HFT facilitates a galvanic isolation between PV panels and the utility grid, and thus it mitigates the appearance of leakage current. An IIBC reduces the ripple in PV panel current and voltages and therefore guarantees improved maximum power point operation (MPPO) of the PV system. To ensure the MPPO at PV panel terminals, a sliding mode control is used. The output DC terminals of IIBC are interfaced with self-commutated switches based SPFBVSC. To synchronize SPFBVSC with the utility grid, a new modified fourth-order generalized integrator (mFOGI) is developed. The mFOGI provides stable synchronization signal even under presence of noise, under/over shoot, or DC offset in the AC supply voltage. The proposed SPGIPS control and its performance are validated on Simulink and prototype system. [ABSTRACT FROM AUTHOR]

Due to the increase in environmental concerns, it becomes mandatory now to focus on energy management and the planning of resources. An integration of distributed generation resources with conventional sources is gaining popularity. The hybrid modeling of the power system poses a complex and challenging optimization problem without getting trapped in a local optimum. A novel Hybrid Statistical Multiswarm Particle Swarm Optimizer-Sine Cosine Algorithm (HSMPSO-SCA) is developed in this paper, and its performance is evaluated on various test benchmark functions. The real operating conditions such as valve point loading, prohibited zones, ramp rate limits and uncertainties in solar and wind power generation for the IEEE 30 bus system are considered for combined emission economic load dispatch (CEELD). The performance of the HSMPSO-SCA is also analyzed for the solution of CEELD for various standard test systems with interaction of solar and wind plants. The efficacy of the proposed HSMPSO-SCA is found to be much better than various metaheuristics, hybrid and multi-agent algorithms in minimizing cost along with emissions optimally and achieves better accuracy and a faster convergence rate. [ABSTRACT FROM AUTHOR]

This article deals with the performance evaluation of fixed-speed and variable-speed stand-alone wind energy conversion systems using an isolated asynchronous generator. A voltage and frequency controller for an isolated asynchronous generator based variable-speed stand-alone wind energy conversion system is investigated using two back-to-back connected voltage source converters and a battery energy storage system. A three-leg insulated-gate bipolar transistor based voltage source converter is used at the machine side for variable-voltage–variable-frequency energy conversion, and a four-leg insulated-gate bipolar transistor based voltage source converter is used between the load terminals and intermediate DC link for feeding regulated voltage and frequency supply. A voltage and frequency controller for an isolated asynchronous generator based fixed-speed stand-alone wind energy conversion system is also designed and modeled using a four-leg voltage source converter and battery energy storage system. A detailed performance evaluation is made between fixed-speed and variable-speed stand-alone wind energy conversion systems using wind data obtained for Jakhau (Gujarat) situated in India. [ABSTRACT FROM AUTHOR]