Abstract
This paper presents a power control method for a hybrid electrical system, which enhances a conventional main AC grid by adding a DC sub-grid in parallel. In this system, each prosumer connects to the sub-grid via a couple of half-bridge inverters of a device called a power router. All of the power routers connected to the sub-grid are controlled such that they maintain the voltage of the sub-grid equally, which is an essential feature of peer-to-peer power accommodation without synchronization. This paper proposes an adaptive hysteresis current-control technique for controlling sub-grid-connected inverters that maintains the voltage of the sub-grid while accommodating a given power. The proposed control method also balances currents between positive and negative lines of the sub-grid simultaneously. The proposed control method is implemented on a high-speed FPGA-based digital controller and is evaluated on three prototypes of the power router. The experimental results show that the proposed method yields fast and stable responses and enables the power router to accommodate power with a high accuracy.
Highlights
Today, various major changes in the electrical power system are being stimulated by rapid increases in photovoltaic (PV), wind-turbine, and other modes of distributed generation, together with digital transformations [1,2,3,4]
The main contribution of this paper is to propose a method that uses adaptive hysteresis current control technique to control accommodated electrical power between the prosumer nodes while maintaining a constant DC voltage in the sub-grid
Compared to the sine-triangle pulse-wide-modulation (SPWM) technique, the hysteresis current-control technique has a stable and fast response; the controller design is simpler since its system parameters are not required in the design process
Summary
Various major changes in the electrical power system are being stimulated by rapid increases in photovoltaic (PV), wind-turbine, and other modes of distributed generation, together with digital transformations [1,2,3,4]. Master–slave control enables the slave to send or receive a specified power via the sub-grid The latter control method requires a sufficiently large power source to be operated as a master in order to maintain the voltage of the subgrid. These two methods cannot be adapted to microgrids based on the P2P accommodation system, in which prosumers can send or receive traded power while contributing to voltage regulation evenly Another issue is that, while many control techniques for AC sub-grids have been studied, control techniques for DC sub-grids are still rare [6,18,22,23,24,25]. The main contribution of this paper is to propose a method that uses adaptive hysteresis current control technique to control accommodated electrical power between the prosumer nodes while maintaining a constant DC voltage in the sub-grid.
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