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Summary With the advancement of technology in renewable energy resources, the researchers and engineers have been more interested in utilizing such energy resources in various types of applications. To utilize commercial loads, the produced energy should be transferred to a high voltage (HV) DC link. In this paper, a double input HV gain DC‐DC converter is proposed. The soft switching capability and bidirectional power flow are achieved in the proposed topology using a coupled inductor structure. Thanks to an improved switching strategy for different power flow modes, soft switching operation of four main switches is achieved in low voltage (LV) to HV power flow direction. In HV to LV power transfer, the soft switching of the half of switches still exists. Moreover, a HV gain is achieved due to utilizing the coupled inductor. To validate the operation of proposed converter in different operation modes, a laboratory prototype was tested, which its results is presented in the paper.

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Gas turbines are increasingly spread throughout the world to provide mechanical and electrical power in consumer and industrial sections. To ensure an accurate control process temperature of gas turbine with no extortionary operator involvement, a proper controller is required. Load frequency control of gas turbine is also regulates the power flow between different areas while holding the frequency constant. The main idea in this study is to assemble these 2 controllers in a unit work; the area of robust control has grown to be one of the wealthy in terms of algorithms, design techniques, analytical tools and modifications. Several books and papers already exist on the topics of parameter estimation and adaptive control. In The proposed approach, a robust and evolutionary based Proportional, Integral, Derivative (PID) is utilized to control frequency-response and a robust evolutionary based Proportional, Integral (PI) is utilized to control temperature. The evolutionary algorithm is used to make an optimal Proportional-Integral-Derivative (PID) controller Tuning parameters. The new robust PID controller is compared with a normal classic controller (Ziegler-Nichols) designed by the method.

Summary The aim of this paper is to improve power quality in a multimicrogrid (MMG) with high penetration of various distributed generators in island and interconnected mode using an improved custom power device called distributed power condition controller (DPCC). The DPCC is an improved, low‐cost, reliable combined custom power device to compensate simultaneously the voltage drop, harmonic distortions, and feeder losses in the MMG, which includes the verity of nonlinear source. It has great market potential and has been selected as the solution for more specific applications. The capability of the DPCC is increased by discrete fuzzy‐based PI controller. In addition, the power injection model of DPCC is presented. Two different case studies corresponding to the island mode and high penetration of renewable generation and nonlinear load in connected mode are considered. According to theoretical studies and simulation results, DPCC successfully improves power quality of the MMGs.