Voltage-sourced HVDC system with modulation function
First Claim
1. A voltage-sourced High-Voltage Direct Current (HVDC) apparatus that converts a 3-phase AC voltage generated by a 3-phase AC power source into high voltage DC through a rectifier including switching elements, the apparatus comprising:
- a sensor unit that detects 3-phase currents, apparent power, and active power from the 3-phase AC voltage generated by a 3-phase AC power source;
a rectifier controller that receives the detected 3-phase currents, apparent power, and active power and generates a D-axis signal and a Q-axis signal;
a D/Q controller that receives the D-axis signal and the Q-axis signal from the rectifier controller and generates active power D-axis signal and apparent power Q-axis signal; and
a PWM unit that generates a PWM on/off control signal for turning on/off the switching elements based on output signals from the D/Q controller,wherein the D/Q controller includes a rotary converter to convert the D-axis and Q-axis signals into an AC signal and a D-axis order unit and Q-axis order unit coupled to the rotary converter, and the D/Q controller generates the active power D-axis signal and the apparent power Q-axis signal through the D-axis order unit and the Q-axis order unit, andthe PWM unit converts the active power D-axis signal and the apparent power Q-axis signal into 3-phase AC signals through a 2/3-phase converter and compares the 3-phase AC signals with 3-phase triangular waves to generate an on/off control signal for turning on/off the switching elements.
1 Assignment
0 Petitions
Accused Products
Abstract
A voltage-sourced High-Voltage Direct Current (HVDC) apparatus, which converts 3-phase AC voltage from a 3-phase AC power source into high voltage DC through a rectifier including switching elements, is provided. In the apparatus, a rectifier controller receives detected 3-phase currents, apparent power, and active power and generates D and Q-axis signals. A D/Q controller receives the signals and generates active power D-axis signal and apparent power Q-axis signal. A PWM unit generates PWM on/off signals for turning on/off the switching elements based on output signals from the D/Q controller. The D/Q controller includes a rotary converter to convert the D and Q-axis signals into AC signals and D and Q-axis order units coupled thereto, and generates the D and Q-axis signals through the order units. The PWM unit converts the D and Q-axis signals into 3-phase AC signals and compares them with 3-phase triangular waves to generate on/off signals for turning on/off the switching elements.
9 Citations
3 Claims
-
1. A voltage-sourced High-Voltage Direct Current (HVDC) apparatus that converts a 3-phase AC voltage generated by a 3-phase AC power source into high voltage DC through a rectifier including switching elements, the apparatus comprising:
-
a sensor unit that detects 3-phase currents, apparent power, and active power from the 3-phase AC voltage generated by a 3-phase AC power source; a rectifier controller that receives the detected 3-phase currents, apparent power, and active power and generates a D-axis signal and a Q-axis signal; a D/Q controller that receives the D-axis signal and the Q-axis signal from the rectifier controller and generates active power D-axis signal and apparent power Q-axis signal; and a PWM unit that generates a PWM on/off control signal for turning on/off the switching elements based on output signals from the D/Q controller, wherein the D/Q controller includes a rotary converter to convert the D-axis and Q-axis signals into an AC signal and a D-axis order unit and Q-axis order unit coupled to the rotary converter, and the D/Q controller generates the active power D-axis signal and the apparent power Q-axis signal through the D-axis order unit and the Q-axis order unit, and the PWM unit converts the active power D-axis signal and the apparent power Q-axis signal into 3-phase AC signals through a 2/3-phase converter and compares the 3-phase AC signals with 3-phase triangular waves to generate an on/off control signal for turning on/off the switching elements. - View Dependent Claims (2, 3)
-
Specification