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In recent years, the research on control strategy of three-phase grid-connected inverter has attracted significant attention. Proportion integration (PI) control method is widely utilized to control the grid-connected inverter. However, coordinate transformation is an essential and complex step during the design process of the conventional PI controller. It is difficult to implement in practice due...
The grid-connected photovoltaic (PV) power generation is expected to be more widespread and paid more attention. In order to suppress the high-frequency harmonic current of PV grid-connected inverters, LCL filter is utilized to lower the current total harmonic distortion rate. On the basis of LCL filter, double-loop current control scheme with the quasi proportional-resonant method is designed. The...
In recent years, variable speed permanent frequency generation, as the main part of wind power generation, has been widely concerned by people. In this paper, choose direct-drive permanent magnet wind power system as the study system, based on the mathematical model of three-phase voltage type PWM inverter on the system grid, then make some improvements on the double-closed loop control strategy,...
According to the laid problem of photovoltaic cells, first of all, we need to divide the wall which laid photovoltaic cells into pieces to lay more photovoltaic cells; Secondly, to make total electricity generation maximize and unit electricity generation cost as little as we can, we established the 0–1 multi-objective programming model; Thirdly, aiming at lowest cost, the inverter configuration optimization...
Aviation battery which is used for giving power to critical load of aircraft for an emergency situation is an important part of the aircraft airborne equipment Traditional battery charging equipments usually adopt simple methods such as constant current or constant voltage to charge battery without the ability of monitoring the status of battery in real time in the charging and discharging process...
Affected by the signal sampling, processing and executing delays, the conventional dead-beat control is actually a one-step-delay control. To solve this problem, an improved dead-beat control method is discussed in this paper. The method calculates the output average voltage one sampling period earlier using the prediction reference current value two sample instants in advance and the inverter output...
Focusing on the non-stationary characteristic of the fault signal of subway auxiliary inverter, this paper proposes the method that combines ensemble empirical mode decomposition (EEMD) with genetic algorithm to optimize BP neural network (GABP) to diagnose the fault categories of subway auxiliary inverter. Firstly, this paper extracts feature vectors from the original fault signal by EEMD, then establishes...
To optimize the power management and control for photovoltaic (PV) system, in this paper, firstly, a structure of PV system is proposed. Secondly, the power management and control of this system is analyzed through strengths weaknesses opportunities threats (SWOT) matrix model and coordinate model. Finally, some experiments are conducted by MATLAB simulation to test weaknesses-opportunities (WO) and...
PMSM has been used widely in elevator speed control system. Based on the mathematical model of PMSM and algorithm of inverter (CFPWM, SPWM, SVPWM), PMSM vector control systems are built. By the software of MATLAB/Simulink, the control systems using three inverter methods of CFPWM, SPWM, SVPWM are comparative simulated and analyzed. The results show that the oscillating of torque, speed, and magnetic...
The PV power plant at home and abroad are basically the unity power factor operation and maximum output of active power. It ignores the reactive power output capability, not for active and reactive power in a separate regulation. Based on the study of the reactive power control strategy for single-phase gird-connected inverter, a single phase voltage type gird-connected inverter mathematical model...
To make the Quasi-Z-source inverter applied in photovoltaic systems better, a flexible grid-connection method based on direct power control is proposed. The proposed method adopted grid power to control APF directly, thus the detection of harmonics and reactive current of loads is omitted. Moreover, space vector modulation (SVM) is adopted to keep switching frequency constant and improve dynamic performance...
With energy efficient power systems and the increasing capacity requirements, chain SVG more widely and gradually become a hot research. SVG device in order to achieve high-performance real-time control, Modulation technique is an important part of the chain of SVG, this paper discusses a single-stage multiplier CPS-SPWM technology superiority to DSP28335 as the main chip, single-stage multiplier...
According to the goal that total annual solar photovoltaic power generation in solar house is as large as possible, and unit power generation costs are as small as possible, multi-objective optimization model of installation and design is established; Efficiency - cost sorting algorithm based on heuristic is proposed. Finally, we applied the algorithm to the practical Photovoltaic cell installation...
To suppress the phase current distortions of the inverter in permanent-magnet synchronous motor (PMSM) drive, an effective online approach for dead-time compensation of the inverter control using a simple disturbance voltage estimator is proposed. The dead-time elimination scheme does not depend on some undesirable characteristics of inverter, such as dead-time, turn-on/off time of switching devices,...
A new control strategy for three-phase grid-connected inverter (GCI) of photovoltaic generation system (PVGS) with LCL filter is proposed. Based on the non-linear 3rd-order model of the inverter, the robust active disturbance rejection control (ADRC), which is composed by the cascaded tracking differentiators (TD), the 4th-order extended state observer (ESO), the non-linear PID (NLPID) and the disturbance...
Among the existing current control methods of LCL grid-connected inverter, the split-capacitor method divides the capacitor of LCL-filter into two parts, which can degrade the system from third-order to first-order through the feedback of the current between the two capacitor branches. However, the cancelled poles in the deflation progress of the splitting capacitor method are critical steady poles...
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