Predicting the environmental economic dispatch problem for reducing waste nonrenewable materials via an innovative constraint multi-objective Chimp Optimization Algorithm

Environmental economic dispatch optimization using niching penalized chimp algorithm

Phase-shift Full-Bridge (PSFB) Converter Integrated Double-Inductor Rectifier with Separated Resonant Circuits (SRC) for 800V High-Power Electric Vehicles

An Improved Design and Performance Enhancement of Y-Source DC-DC Boost Combined Phase Shifted Full Bridge Converter for Electric Vehicle Battery Charging Applications

Staircase modulation improvement to balance output power of stages of cascade H-bridge multilevel inverter

This paper introduces a topology named bidirectional PSFB (B-PSFB) DC-DC converter, which can realize real seamless power transition by unified modulation strategy. The modulation strategy of the switches is given, and the working modes of the converter are discussed in detail. In buck mode, the Zero-Voltage-Switching (ZVS) of switches in the primary side is analyzed. In addition, A RCD clamping circuit is used to suppress the voltage oscillation and spike. The theoretical efficiency under different working conditions is given as well. Finally, a 2kW prototype of B-PSFB DC-DC converter is established to verify the performance of bidirectional power flow and seamless power transition.

A Bidirectional PSFB (B-PSFB) DC-DC Converter with Seamless Power Transition

In the three-phase photovoltaic (PV) cascaded inverter, the output power of PV arrays is not equal due to the difference of solar radiation, temperature and other factors, which leads to the over modulation of PV cascaded inverter. In order to solve the above problems, the carrier phase-shifted PWM (CPS-PWM) control strategy based on third harmonic injection is proposed in this paper, taking a single-stage high-frequency-link isolated cascaded PV inverter topology with clamping circuits as an example. It can not only improve the utilization of DC voltage, but also enlarge the power balance constraint range between the units in the phase of cascaded PV inverter, so as to ensure that all units can avoid over modulation under some serious power imbalance cases, and will not increase the third harmonic component injection of grid current. Firstly, the topology and working principle of the proposed inverter based on CPS-PWM control strategy are introduced. Then, the improved CPS-PWM control strategy which can improve the DC voltage utilization of the PV cascaded inverter is analyzed, and the control strategy of intra-phase power balance is emphatically analyzed in the overall control strategy of PV cascaded inverter system, and it is discussed that the proposed control strategy can also enlarge the power balance constraint range between the units of the cascaded inverter. Finally, the effectiveness of the proposed PV cascaded inverter based on the improved CPS-PWM control strategy is verified by the simulation and experimental results.

/pdf/dc-voltage-utilization-improvement-to-enlarge-power-balance-e3pe6yjfr8.pdf

DC Voltage Utilization Improvement to Enlarge Power Balance Constraint Range for Photovoltaic Cascaded Inverter

This paper introduces a new type of direct AC-AC single-stage isolated modular multilevel cascaded converter(I-M2C2). The characteristic of this I-M2C2 is that it can directly carry out constant frequency or variable frequency AC / AC conversion from three-phase to single-phase to realize power transmission of low-frequency or equal frequency. The converter topology uses high-frequency magnets to achieve the required isolation, and it does not need intermediate DC link, which reduces the intermediate conversion. Therefore, the topology has the potential of higher overall efficiency. The converter has three basic voltage ports: three-phase medium voltage AC (MVAC (T-P)), single-phase medium voltage AC (MVAC (S-P)) and low-voltage direct current (LVDC). It is suitable for interconnection of offshore and onshore wind farms with power grid, electric traction of urban rail or new energy grid. This paper introduces the topology, sub-module (SM) modulation and average equivalent model of I-M2C2. The effectiveness and superiority of the proposed topology are verified by simulation results.

AC-AC Type Isolated Modular Multilevel Cascaded Converter (I-M 2 C 2 ) based on Common DC Bus

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Papers

A Bidirectional PSFB (B-PSFB) DC-DC Converter with Seamless Power Transition

DC Voltage Utilization Improvement to Enlarge Power Balance Constraint Range for Photovoltaic Cascaded Inverter

AC-AC Type Isolated Modular Multilevel Cascaded Converter (I-M 2 C 2 ) based on Common DC Bus