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| Adaptive Predictive Controller of Supply Current Applied in Single-Phase PWM Rectifier |
| Wu Zhenxing, Zou Yunping, Zhang Zheyu, Zhang Yun |
| Hubei Electric Power Security and High Efficiency Key Lab Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract To solve the problem that the maximum duty is limited by the delay caused by sampling and calculation, one-step-delay control is usually adopted in the digital control system, but it will reduce the range of stability. Take the proportional controller as an example, this paper analyzes this problem, and proposes a supply current predictive controller which adopts the variable step-size adaptive algorithm. Because the weighted coefficient is regulated by the error calculated in each sampling period, this algorithm shows well predictive accuracy. If the other conditions and parameters of main circle and control system don't change, the stability range will increase. At the same time good accuracy at steady-state and fast dynamic performance will be presented. Simulation and experimental results testify feasibility of the proposed method.
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Received: 21 March 2009
Published: 12 December 2014
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2010, Vol. 25 
