A method for improving the current inner loop control gain of single-phase full-bridge inverter power supply
A technology of inverter power supply and single-phase full bridge, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. , current distortion and other issues
Inactive Publication Date: 2017-08-22
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a method for improving the control gain of the current inner loop of a single-phase full-bridge inverter power supply, which solves the problem that the steady-state error of the voltage outer loop is limited by the gain of the current inner loop in the prior art, and the gain of the current inner loop is small. The problem of voltage and current distortion caused by the influence of linear load
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[0056] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0057] The circuit diagram of single-phase full-bridge inverter power supply among the present invention, as figure 1 shown, including the DC input voltage V dc , DC input voltage V dc The anodes of the positive poles are respectively connected to the collector of the first switching tube S1 and the collector of the third switching tube S3, and the DC input voltage V dc The negative electrode of the second switching tube S2 is connected to the emitter of the fourth switching tube S4, and the emitter of the first switching tube S1 is respectively connected to the collector of the second switching tube S2 and one end of the inductor L. The other end is connected to one end of the capacitor C, and the other end of the capacitor C is respectively connected to the emitter of the third switch S3 and the collector of the fourth switch S4, and the ...
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The invention discloses a method for improving the current inner loop control gain of a single-phase full-bridge inverter power supply. , its output is the given value of capacitor current iCref, the given value of capacitor current iCref and capacitor current iC are used to calculate the duty cycle of each switch tube through the capacitive current prediction control function f(Vdc, Vo, Ts, iC, L). The PWM modulation generates the driving waveform to control the single-phase full-bridge inverter power supply; the duty cycle of each switch tube obtains the output voltage VD of the single-phase full-bridge inverter power supply side through the DC input voltage Vdc, and the output of the single-phase full-bridge inverter power supply side The voltage VD and the load output voltage Vo are negatively feedbacked to obtain the inductor voltage VL. The inductor voltage VL is processed by the inductor mathematical model to obtain the inductor current iL. The inductor current iL and the load current io are negative feedback operations to obtain the capacitor current iC. The capacitor current iC is processed by the capacitor mathematical model. The integral processing obtains the load output voltage Vo. The invention can effectively suppress the voltage and current distortion caused by the nonlinear load.
Description
technical field [0001] The invention belongs to the technical field of inverter power supply control, and in particular relates to a method for increasing the current inner loop control gain of a single-phase full-bridge inverter power supply. Background technique [0002] Inverter circuits can realize the conversion of DC power to AC power, and have been widely used in power systems, household appliances, transportation, industrial power supplies, aerospace and other fields. Applying inverter technology to energy-saving lighting systems can not only use green energy (solar energy and wind energy, etc.) to reduce environmental pollution, but also save electricity and improve energy efficiency. Control strategies for single-phase inverters have been proposed one after another, and have been deeply developed and widely used. [0003] At present, there are several mature single-phase inverter control schemes with better control effects: voltage single-loop PID control, repetit...
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IPC IPC(8): H02M7/5387H02M7/5395
Inventor 张琦张鹏赵双双孙向东安少亮杨惠
Owner XIAN UNIV OF TECH