In order to effectively control the working state of the gyroscope in drive mode, the drive characteristics of the micro electromechanical system （MEMS） gyroscope are analyzed in principle. A novel drive circuit for...In order to effectively control the working state of the gyroscope in drive mode, the drive characteristics of the micro electromechanical system （MEMS） gyroscope are analyzed in principle. A novel drive circuit for the MEMS gyroscope in digital closed-loop control is proposed, which utilizes a digital phase-locked loop （PLL） in frequency control and an automatic gain control （AGC） method in amplitude control. A digital processing circuit with a field programmable gate array （FPGA） is designed and the experiments are carried out. The results indicate that when the temperature changes, the drive frequency can automatically track the resonant frequency of gyroscope in drive mode and that of the oscillating amplitude holds at a set value. And at room temperature, the relative deviation of the drive frequency is 0.624 ×10^-6 and the oscillating amplitude is 8.0 ×10^-6, which are 0. 094% and 18. 39% of the analog control program, respectively. Therefore, the control solution of the digital PLL in frequency and the AGC in amplitude is feasible.展开更多
风能、光伏发电站参与调压控制,必要时可为电网提供紧急无功支撑,达到满足电能质量和降低网损的要求。阐述了地区级电网新能源AVC控制(Automatic Voltage Control)的原理及实际应用,总结归纳了新能源AVC控制并网接入的常见问题,通过35 k...风能、光伏发电站参与调压控制,必要时可为电网提供紧急无功支撑,达到满足电能质量和降低网损的要求。阐述了地区级电网新能源AVC控制(Automatic Voltage Control)的原理及实际应用,总结归纳了新能源AVC控制并网接入的常见问题,通过35 kV新能源AVC子站接入地区级主站实例的综合实验,证明了新能源AVC控制在曲线下发、闭环控制策略及电压跟随等功能的有效性,同时在响应上具备较好的跟随性和快速性。展开更多
基金The National Natural Science Foundation of China(No. 60974116 )the Research Fund of Aeronautics Science (No.20090869007)Specialized Research Fund for the Doctoral Program of Higher Education (No. 200902861063)
文摘In order to effectively control the working state of the gyroscope in drive mode, the drive characteristics of the micro electromechanical system （MEMS） gyroscope are analyzed in principle. A novel drive circuit for the MEMS gyroscope in digital closed-loop control is proposed, which utilizes a digital phase-locked loop （PLL） in frequency control and an automatic gain control （AGC） method in amplitude control. A digital processing circuit with a field programmable gate array （FPGA） is designed and the experiments are carried out. The results indicate that when the temperature changes, the drive frequency can automatically track the resonant frequency of gyroscope in drive mode and that of the oscillating amplitude holds at a set value. And at room temperature, the relative deviation of the drive frequency is 0.624 ×10^-6 and the oscillating amplitude is 8.0 ×10^-6, which are 0. 094% and 18. 39% of the analog control program, respectively. Therefore, the control solution of the digital PLL in frequency and the AGC in amplitude is feasible.
文摘风能、光伏发电站参与调压控制,必要时可为电网提供紧急无功支撑,达到满足电能质量和降低网损的要求。阐述了地区级电网新能源AVC控制(Automatic Voltage Control)的原理及实际应用,总结归纳了新能源AVC控制并网接入的常见问题,通过35 kV新能源AVC子站接入地区级主站实例的综合实验,证明了新能源AVC控制在曲线下发、闭环控制策略及电压跟随等功能的有效性,同时在响应上具备较好的跟随性和快速性。
