Title:
METHOD AND SYSTEM FOR CONTROLLING VOLTAGE INVERTER
Document Type and Number:
WIPO Patent Application WO/2018/033073
Kind Code:
A1
Abstract:
Disclosed are a method and system for controlling a voltage inverter. The method and system relate to a combination, in an inverter, of rotor angle-droop control technology and virtual synchronous generator technology. The difference between a preset angle reference value and the angle of a virtual rotor in a GPS-determined synchronous-rotation coordinate system in an inverter is calculated, then a proportional differential algorithm is used to obtain the input mechanical power of the virtual rotor; using the output active power obtained from the virtual input mechanical power and measurement, it is possible to determine according to an equation of the motion of the rotor the angle of the virtual rotor. The angle ultimately is taken as a modulation wave angle and outputted to an SPWM inverter control. The method and system of the present invention ensure that after a load in a microgrid has changed, the accurate tracking of load changes autonomously performed by the inverter power supply (without requiring the interference of an additional control layer) maintain the active balance and constant frequency of the microgrid. In addition, the magnitude of load change is shared approximately equally among multiple inverter power supplies according to power supply capacity.
Inventors:
WEI QIANG (CN)
Application Number:
PCT/CN2017/097532
Publication Date:
February 22, 2018
Filing Date:
August 15, 2017
Export Citation:
Assignee:
WEI QIANG (CN)
International Classes:
H02J3/46
Foreign References:
| CN103066876A | 2013-04-24 | |||
| CN105529980A | 2016-04-27 | |||
| CN103259475A | 2013-08-21 | |||
| CN103346719A | 2013-10-09 |
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