Industrial Technology Research Institute

Zong-Zhen Yang

Yoshihiro Konishi

Shu-Syuan Huang

Min-Ju Hsieh

Wan-Pei Chen

Meng-Yi Lin

A voltage balance control method applicable to a three-phase DC-AC inverter is provided, the voltage balance control method including: multiplying, by a first multiplier, an actual value of a line capacitance voltage by a sine function to generate a first voltage; capturing, by a first filter, a DC part of the first voltage to generate an error DC component; subtracting, by a first subtractor, the error DC component from a target voltage amplitude to generate a second voltage; adjusting, by a first proportional-integral controller, the second voltage to generate an amplitude error compensation value; and adding, by an adder, the amplitude error compensation value with the target voltage amplitude to generate an amplitude reference value. A voltage balance control device applicable to a three-phase DC-AC inverter is also provided.

Voltage balance control method and device for three-phase DC-AC inverter

A sensorless measurement device for filter capacitor current by using a state observer is provided. The sensorless measurement device comprises a chip, wherein the chip comprises the state observer. The state observer is configured to retrieve a filter-capacitor-voltage actual value and a direct current link (dc-link) voltage of a present sampling time. According to the filter-capacitor-voltage actual value and the dc-link voltage, the state observer is configured to output a filter-capacitor-voltage state variable value, a filter-capacitor-current state variable value, and a disturbance-voltage state variable value of a next sampling time. The filter-capacitor-current state variable value is an average current value without ripples.

Sensorless measurement method and device for filter capacitor current by using a state observer

A ripple-compensation control method and electrical energy conversion device utilizing the same are provided. The ripple-compensation control method is disclosed, adopted by an electrical energy conversion device including a converter configured to perform electrical energy conversion, a controller coupled to control terminals of the converter and controlling a first voltage of a DC node of the converter according to a command value, and a ripple-compensation unit configured to generate a ripple-component voltage of the first voltage and provide the command value generated based on the ripple-component voltage to the controller.

Growing community of inventors

Kaohsiung, Taiwan

Zong-Zhen Yang