Research on the application of intelligent under-frequency/under-voltage load shedding considering demand response

With the installation and application of smart meters, smart appliances, and other smart devices in the user side, the dynamic information measued by these devices can be obtained and used for power system security and stability analysis & control. Based on the summary of intelligent underfrequency/undervoltage load shedding technology, the intelligent appliance load types and the role of smart appliances in the grid control were analyzed firstly. Using the intelligent measurement and control technology, the traditional underfrequency/undervoltage load shedding schemes was improved. And a combined with intelligent demand response technology was proposed with consideration of intelligent home appliances in response to new types of underfrequency/under voltage load shedding schemes, realize rapid response resources and under-frequency/under-load shedding schemes coordinated control. Time-domain simulation results showed that the under frequency load shedding project can adapted grid complex operating environment, quickly and avaliably inhibit falling-down of fault frequency, reducing the loss of load shedding, improves the flexibility and reliability of the system. The poposed intelligent low-frequency voltage load shedding scheme was verified by the simulation of Jiangsu province grid, and the simulation result verified the effectiveness of this novel under frequency and under voltage load shedding algorithm.