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The three-phase Power Electronic Load (PEL) simulation of the asynchronous motor operation can be the divided into AC sine wave drive mode, the inverter open-loop drive mode and the inverter closed-loop drive mode. The control strategy of these three kinds of working conditions is simple to complex, and has certain inheritance and progressive relations. In the AC sine wave drive condition, the discrete...
It has been recognized that the proper parameters for the load model is significant to represent a load accurately. On the basis of introducing the Particle Swarm Optimization (PSO) and the Ant Colony Optimization (ACO), a parameter identification method of load model using PSO and ACO respectively were proposed and employed in the specific case study in this paper. It is shown by the case that the...
Based on comparing between the Composite Load Model (CLM) with the Synthesis Load Model (SLM), the SLM has been adopted in this paper. In view of the load model parameter identification's characteristics of complexity and low accuracy, a parameter identification method of the SLM based on Particle Swarm Optimization algorithm was proposed and used in the specific case study. It is shown by the case...
In this paper, a novel simulation method of the three-phase phase-controlled rectifier bridge load is proposed. This method is very important for power electronic load (PEL) to test the power quality. About this content, there are few articles mentioned. Through the detailed analysis of three-phase phase-controlled rectifier bridge characteristics, a kind of load simulation algorithm is proposed....
When the problem of the model predictive control cannot be solved, the control system will not work properly. A control strategy based on model predictive control and PI is proposed in this paper. The control strategy of the model predictive control and PI is applied to the three-phase off-grid inverter. Adaptability of the PI controller to the operating mode is improved and the dynamic performance...
Electromagnetic gun loading control system is based on the core chip of STM32F103VET6, and the measurement system based on LABVIEW. Displacement sensor and pressure sensor of signals are collected and transmitted via two USB to PC, it can be observed in real time online, at the same time, people can control the movement of the push rod status by PC to send commands. STM32 chip has low power consumption...
Microgrids are key elements for integrating various distributed energy resources (DERs). Conventionally, the real power-frequency droop control and the reactive power-voltage magnitude droop control are adopted in DERs. However, when the power is up to an extreme limit, the frequency and voltage must be cut off and the control strategies can no longer adopt the droop control but the PQ control. In...
This paper presents mechanisms of the voltage spike and the diode freewheel phenomenon caused by the diode reverse recovery in the commutation of doubly salient brushless DC generator (DSBLDCG). An analytical solution for the voltage spike is derived on the basis of a simplified model of the diode reverse recovery. Some factors that influence the spike size, such as the rotating speed, field current...
In view of the strongly nonlinear characteristic of electro-hydraulic servo system (EHSS), this paper aims to conduct nonlinear ordinary differential equation (ODE) parameter identification of white-box model based on the knowledge of part of the system information so as to get the accurate nonlinear model that can meet the actual needs. By establishing the state space model of the hydraulic system...
In order to solve the common problems of dual-motor asynchrony in dual-drive synchronization control system, and achieve precise synchronization control of dual-screw drive system, an improved cross coupling control algorithm based on disturbance compensation is proposed in this paper and the corresponding mathematical model is established. First, setting several groups' parameters of the disturbance...
Multilevel inverter in high power applications more and more widely, based on the principle of space vector is proposed a multilevel PWM algorithm, the algorithm is easy to determine the reference vector position and functions of time, combined with the corresponding switching sequence of the inverter switching signals are generated. The implementation of PWM algorithm is not only easy to be extended...
When there is a power failure in distribution network, commercial building microgrid (CBMG) can be operated autonomously to guarantee the reliability of power supply. In order to reduce the influence of power outage and improve the reliability of power supply, this paper presents a novel emergency energy management (EEM) strategy, which is composed of EEM model and rolling optimization strategy. EEM...
A novel control strategy for three-phase combined inverter is proposed in this paper, which ensures three-phase output voltage symmetry under unbalanced loads in microgrid. Based on the power, voltage and current triple-loop controller, an improved P-f and Q-U droop control strategy is designed to keep three-phase reference voltage symmetrical which is changed through adjusting each-phase droop curve...
With increasing size and unit capacity of photo-voltaic power generation, the impacts of photovoltaic generation on the power system have become increasingly prominent. This paper presents one methodology to evaluate the impact of photo-voltaic generation in the random production simulation. The algorithms used to solve probabilistic production simulation is equivalent energy function method. Which...
The conventional linear extended state space predictive control(ESSPC) is an effective method to control linear systems. However, the linear ESSPC can not handle the plant which is characterized by nonlinearity. To deal with the nonlinear behavior of boiler-turbine system, in this paper, an improved ESSPC based on T-S fuzzy model is proposed. Firstly, T-S fuzzy model is chosen to describe the global...
To ensure the transient performances of the singlephase induction motor with three parallel-connected windings, the simulated and experimental researches are carried out detailedly in this paper. At first, the transient simulation model of the motor is established and the simulation analysis is performed. Then the experiments are performed on the prototype motor, to verify the validity of the above...
In this paper, the resource sharing problem is considered for a network composed of interconnected dc nanogrids. Each nanogrid is equipped with photovoltaic (PV) energy and batteries. In order to improve the utilization of PV energy among the nanogrids, the amount decision of the sharing electricity needed to be made. An online Lyapunov-based algorithm of resource sharing among the interconnected...
In this paper, to further improve the performance of dynamic and anti-interference of the permanent magnet synchronous motor (PMSM) control system, the grey control strategy of predictive current for PMSM is proposed by analyzing the characteristics of the actual current response in control system and making full use of historical current data to adjust the current value quickly to follow the change...
Reliable and stable insertion force is usually of utmost significant characteristic in a system which contains thousands of electrical connectors. Even if an electrical connector fails, it will lead to the whole system collapses. This paper established an insertion force model of a kind of electrical connector based on simply supported beam mechanical calculation theory. Experiment and simulation...
This paper describes a current control of the three-phase inverter in a stand-alone wind energy system using model predictive control (MPC). The system includes a wind turbine without the use of a gearbox, a permanent magnet synchronous generator (PMSG), a pure diode based three-phase rectifier and a three-phase voltage-source two-level inverter. The simulation results obtained by using MATLAB/Simulink...
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