KEYWORDS: Servomechanisms, Design and modelling, Control systems, Clocks, Telecommunications, Data transmission, Digital signal processing, Reliability, Field programmable gate arrays, Device simulation
Nowadays, various servo controllers on the market are increasingly pursuing higher power density, which means that the hardware design of each module in the system should be small enough. The application of EtherCAT communication technology has become the mainstream of the development of servo system interface. Therefore, this paper designs a small-size EtherCAT slave controller applied to the servo system. By using ARM to simulate the memory function of EEPROM, sharing the clock source between the slave communication element and the servo control element, and integrating the slave communication module with the servo control module, the volume of EtherCAT slave hardware platform is reduced effectively, which provides favorable conditions for improving the power density of the servo system. After experimental verification, the final design of the small-size EtherCAT slave controller can perform standard, correct and reliable EtherCAT communication work.
KEYWORDS: Magnesium, System on a chip, Control systems, Solar energy, Nonlinear dynamics, Complex systems, Analytical research, Modulation, Wind energy, Renewable energy
In this paper, the power generation costs of different DG and public energy storage in DC microgrid (MG) interconnected system are analyzed. On this basis, a decentralized nonlinear dynamic droop gain control strategy based on equal micro-increase rate criterion is proposed, which automatically adjusts the output of DG to make the microincrease rate of each DG and two MGs in the same MG equal to public energy storage, so as to achieve economic optimal operation. Finally, the decentralized economic optimal operation control strategy is verified in the simulation.
In order to cope with the sudden increase in the number of electric vehicles and solve the problem of bidirectional energy flow between them and the power grid. In this paper, a direct-connected single-phase single-stage isolated bidirectional AC-DC converter based on the dual active full bridge topology is proposed. So that the shortcomings of the traditional two-stage AC-DC converter such as low efficiency and poor reliability are avoided. At the same time, there is a zero vector PWM modulation strategy based on phase-shift modulation designed, which can realize open-loop power factor correction and synchronous rectification. It enables the converter to provide a freewheeling path during the blocking time without any snubber circuit. Finally, the system simulation verification is carried out on the PLECS simulation platform, and a 300W experimental prototype is built to verify the effectiveness of the proposed scheme.
KEYWORDS: Magnesium, Solar energy, Photovoltaics, Mathematical modeling, Renewable energy, Electromagnetism, Reliability, Particle swarm optimization, Optimization (mathematics), Solar energy systems
Aiming at the problem of excessive configuration capacity in multi-energy microgrid (MG) planning, this paper first analyzes the system optimization of MG, establishes the flow chart of the optimal sizing of the entire system, then proposes the optimal sizing constraints considering the load loss probability, and establishes a configuration planning model, selects the appropriate configuration method for solving. By using particle swarm optimization (PSO) algorithm to calculate and analyze, the optimal sizing result can be obtained. Furthermore, simulation is conducted combined with case studies to compare the configuration selection of peak load, and verify its economy through simulation.
Due to the increasing penetration of new energy generation based on power electronic devices in the power grid, the characteristics of the power system are changing. As a new and continuously developing concept proposed in recent years, the grid-forming(GFM) inverter can adapt to the grid with high penetration of renewables, especially can provide support for the power grid in the weak grid. In this paper, the synchronous power control(SPC) strategy is adopted , and the behavior of the GFM inverter is analyzed during the fault. To address the overcurrent problem under weak grid, a current-limiting strategy is proposed considering the effect of the power outer loop, which limits the current within the allowable range while maintaining the grid structure in the weak grid, and improves the dynamic response. Finally, a simulation model is built in PLECS to verify and analyze the proposed control strategy.
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