Distributed power grid frequency secondary regulation method and system

• Main Authors: LIU ZENGLEI, CHEN MULIN, HONG JUN, HE XI, DONG HENG
• Format: Patent
• Language: Chinese; English
• Published: 22.07.2022
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a distributed power grid frequency secondary regulation method and system, and relates to the technical field of power distribution network power supply, and the method comprises the steps: independently sampling the system frequency through each VSG, transmitting the calculated frequency deviation to a PI controller to obtain the power regulation amount of each VSG, superposing the power regulation amount with a given rated active power, and transmitting the superposed power regulation amount to an active frequency control module; therefore, the multiple VSGs operate in parallel to jointly adjust the frequency of the micro-grid. The frequency deviation of the power distribution network can be reduced, and the power quality of supporting equipment in the feeder interconnection process is effectively improved. 分散式电网频率二次调节方法及系统，涉及配电网供电技术领域，该方法通过各VSG独立采样系统频率，计算出的频率偏差送入PI控制器来获取各自的功率调节量，并与给定额定有功功率叠加后送入有功频率控制模块，从而实现多个VSG并联运行共同调节微电网频率。本发明可减小配电网的频率偏差，有效改善馈线互联过程中支撑装备电能质量。