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Battery energy storage system(BESS) connected to the grid by power conversion system(PCS). Currently Cascaded Multilevel Converter(CMC) and Modular Multilevel Converter (MMC) are two more advanced topologies for PCS. This paper compares CMC and MMC topologies in aspects of efficiency, harmonic characteristics, reliability, control system complexity and cost, the simulation results are presented. Suggestions...
A novel bridgeless Buck power factor correction (PFC) converter with only half dead zones is proposed in this paper. The operation of the proposed PFC converter can be divided into two different modes including Buck mode in positive line cycles and Cuk mode in negative line cycles. Compared with the bridge or bridgeless Buck PFC converter, only half dead zones occur in this proposed PFC converter...
Interleaved double dual boost (IDDB) DC-DC converters are widely used in high-power renewable energy conversion applications, which can provide both high step-up ratio and low current ripple. This paper is focused on the nonlinear modeling and control of non-ideal IDDB converter. A sliding mode controller is design based on the model with parasitics considered. Some key issues on the control design...
To suppress the common mode current flowing into the grid effectively, this paper presents a novel active clamping inverter topology with non-isolated single-phase photovoltaic grid inverters. This topology can provide freewheeling path and separate solar panels from the grid at the freewheeling stage. In addition, a series resistor in the clamping channel of the new structure is added, which can...
Modular Multilevel Converter (MMC) is the latest achievement in terms of the main circuit topology in flexible HVDC, which has the merits of high modular, low harmonic content of output waveform and long maintenance interval. On the basis of analysis of topology and working principle, a strategy which adopts carrier phase shift modulation (CPS-SPWM), is proposed in this paper. Under low devices switching...
The main advantage of the master-slave control strategy of series-parallel connected DC/DC converters is that the system is of advanced structure, practical functions, convenient maintenance and better extendibility. However the strategy is mainly used in the input-parallel output-parallel (IPOP) converters, which can balance the currents efficiently. This paper proposes a master/slave control strategy...
Multi-terminal dc (MTDC) systems based on line-commutated converters have been studied and discussed for more than fifty years. However, no series MTDC system has actually been implemented due to the difficulties in the dc circuit breaker design and the coordination between dc terminals. Recently, the topology with two series converters located in the same station has been becoming popular in practice...
This paper establishes a new framework for electrical cyber-physical systems (ECPSs). The communication network is designed by the characteristics of a power grid. The interdependent relationship of communication networks and power grids is described by data-uploading channels and commands-downloading channels. Control strategies (such as load shedding and relay protection) are extended to this new...
With the rapid development of photovoltaic (PV) power generation, technology of the grid-connected photovoltaic system becomes an important part of the photovoltaic power generation. Based on this background, grid connection techniques of T-Type three-level grid-connected inverter with an LCL filter is studied in this paper. The subject combines SPWM modulation strategy and dual current loop control...
Z source inverter overcomes the shortcomings of the traditional voltage source and current source, but its DC side current is not continuous, the voltage utilization is low and the boost factor is limited. In recent years, some scholars have proposed a new inverter — switching boost inverter (SBI). Compared with the traditional Z source inverter, the boost factor of SBI is reduced, but the cost and...
The equalization speed and efficiency are the key issues of battery equalization. In order to improve the equalization performance, this paper proposes an any-cell(s)-to-any-cell(s) equalizer based on bidirectional inductor converters. With inductor converter legs connected to each lithium-ion cell polarities, this topology can transfer energy from any cell(s) to any cell(s), which results in an enhancement...
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