Digital Adaptive Hysteresis Current Control for Multi-Functional Inverters

Abstract

This paper proposes a digital adaptive hysteresis current control method for multi-functional inverters in a power-flow control device called digital grid router. Each inverter can be controlled in master, grid-connected, or stand-alone modes, which can be specified by the controller. While the popular linear sine-triangle pulse width modulation (SPWM) control technique requires complicated proportional-integral (PI) regulators with an unavoidable time delay, hysteresis current control has a simple structure, fast responses, and robustness due to its independent system of parameters. Since the hysteresis current control method controls the output current stay around the reference current directly, in the multi-functional inverter, the reference output is not given by a current directly. Thus, the reference current used to implement the hysteresis current control in this study is calculated from the given reference voltage or power in each control mode. The controller uses high-speed sampled data at MHz level and is implemented by using a field-programmable gate array (FPGA). Experimental results show good performances of the proposed controller in controlling power exchanges in the digital grid router.

MPPT and SPPT Control for PV-Connected Inverters Using Digital Adaptive Hysteresis Current Control

“…The main concept of the digital grid is dividing a large synchronous grid into smaller segmented grid cells, which connect together, to the current grid, and other distributed generations via the DGR as shown in Figure 1 [18]. The DGR controls power flow of the equipment within a cell based on the trading results receiving from the electricity trading system.…”

“…The grid has a voltage of v g . In this work, the grid-connected inverter is controlled by using the adaptive hysteresis current control presented in session 3 with the reference current is calculated as [18]:…”

Energy Routing Control Strategy for Integrated Microgrids Including Photovoltaic, Battery-Energy Storage and Electric Vehicles

“…All components are connected through integrated information energy switching equipment [14]. Almost all of the above Energy Internet prototypes contain energy routers or power routers, indicating that energy routers are one of the key technologies of the Energy Internet [15,16]. Therefore, the Energy Internet is also defined as a multi-level distributed energy sharing complex network based on energy routers and energy LANs (units) with the microgrid as its basic structure [17].…”

Hardware in the Loop Real-time Simulation for the Associated Discrete Circuit Modeling Optimization Method of Power Converters

“…One possibility is to consider a priori the switch admittance parameter, and then find the corresponding optimum value by comparing the offline simulation results with the benchmark results to minimize the relative errors; however, such a trial-and-error method has a low efficiency [19]. Within this context, the paper proposes a novel approach to choose the optimal switch admittance parameter, Gs, by minimizing the switching loss to reduce the computations required and increase the simulation precision.The high parallelism offered by FPGAs and their potential to conduct a real-time simulation in the nanosecond range make these devices an emerging processor for real-time simulation of a complex power electronic system [20][21][22][23][24]. However, due to the limited FPGA hardware resources, it is especially important to balance FPGA resource consumption and simulation accuracy.…”

“…The high parallelism offered by FPGAs and their potential to conduct a real-time simulation in the nanosecond range make these devices an emerging processor for real-time simulation of a complex power electronic system [20][21][22][23][24]. However, due to the limited FPGA hardware resources, it is especially important to balance FPGA resource consumption and simulation accuracy.…”