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The shunt regulator of power unit conditioning in spacecraft is a nonlinear system due to the adopted multistage hysteresis control method. According to the existed nonlinear stability analysis results based on describing function, SR will run in the critical stable mode at special parameter regions. In this paper, an iteration method is proposed to confirm the critical stable parameter region. As...
The shunt regulator (SR) is a key part of the power conditioning unit, which is a kind of power supply system for spacecrafts. SR is a strong nonlinear system due to the hysteresis control adopted, but the stability analysis for SR is still ground on the approximate linearization. In this paper, a novel stability analysis method for strong nonlinear systems is proposed based on describing function,...
A new TCN-network modeling method is presented for performance analysis in this paper. We describe the periodic scheduling algorithm of the bus administrator using OPNET Modeler. The time distribution occupied by master frame and slave frame is obtained in order to verify the reliability of the algorithm. Packet throughput and time latency characteristics are simulated and analyzed under different...
Photovoltaic power application is developing dramatically. MPPT is the key algorithm in the PV system, and it is comprehensively studied. However, it is difficult to perform MPPT test in laboratory, because the necessary installation area and cost is not usually achievable. It is urgent to develop the photovoltaic (PV) array simulator for designing and research the photovoltaic power generation system...
It is urgent to develop the photovoltaic (PV) array simulator for designing and research the photovoltaic power generation system to save cost and space. Therefore, two kinds of photovoltaic array simulators based on voltage source PWM rectifier and current source PWM rectifier are presented. They can be adopted for different applications. By the way of PV cells mathematical model, the output characteristics...
Speed estimation in field-oriented vector control of induction motor depends on effective estimation of rotor flux. This paper proposes speed estimator using improved rotor flux estimator based on modified voltage model with a high orders low-pass filter (LPF) and a low-pass filter in series and an error compensator by rotor flux oriented current model. In the flux estimation based on voltage model,...
This paper presents a new solution, which can completely remove the DC offset and make the dynamic error of flux observation smaller when using the modified voltage model compensated by rotor flux oriented current model. The modified voltage model with error compensation not only completely eliminates the integration drift, but also realizes errorless flux estimation in steady state and dynamic state...
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