Ma Shicong

Guide for voltage regulation and reactive power compensation at 1000kV AC and above with IEEE P1860 standard

There is multi voltage levels including UHV and complex operation for wide-area power transmission for future power grid. The voltage regulation and reactive power compensation are more dependent on the cooperation of devices and methods in each voltage levels including UHV, EHV and lower voltage level. Reasonable configuration can save cost and improve operation efficiency. The configuration principle and regulation methods which are from the studies on IEEE P1860 Standard were proposed in this paper. And some examples for regulation process and compensation configuration were shown as well.

Study on operation characteristics and stability evaluation method at sending-end of DC transmission system

For the situation that many Ultra-HVDC projects can not reach the maximum transmission capacity in the beginning of operation. Considering more Ultra-HVDC projects put into operation recently, this paper analyzed key facts limiting transmission capability at the sending-end of Ultra-HVDC from static stability, voltage fluctuation and AC-DC coupling characteristics. Furthermore, based on short-circuit ratio which is usually in receiving-end of DC, analyzes the relationship between short-circuit ratio of sending-end of DC and maximum transmission capability, and the critical short-circuit ratio maintaining stable operation of system at sending-end of DC transmission is given.

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.