SUPPORTED BY

• Ministry of Non-conventional Energy Sources, Government of India, New Delhi
• Ministry of External Affairs, Government of India, New Delhi
• Ministry of Environment and Forests, Government of India, New Delhi
• Government of Madhya Pradesh, Bhopal
• Indian Wind Power Association, Chennai
• Centre for Wind Energy Technology, Chennai
• Indian Renewable Energy Development Agency, New Delhi
• India Energy Forum, New Delhi
• Assocham, New Delhi
• PHD Chamber of Commerce and Industry, New Delhi
• Senergy Global Pvt. Ltd.

Speaker Profiles

Yongning Chi

Presentation Type: Oral



Address: China Electric Power Research Institute No. 15, Xiaoying East Rd. Qinghe, Beijing 100085 CHINA
Phone: 8601082812430
Email-ID: chiyn@epri.ac.cn
Organization: Renewable energy department of China Electric Power Research Institute
Designation: Ph.D Student
Country: China

Paper Title: Countermeasures to mitigate the voltage instability arises from wind power integration

Abstract of the paper

In some regional grids in China, wind power penetration will increase rapidly because of the abundant wind resources in those areas and the government policy impetus. However, the power system security and stability may be affected due to the higher wind power penetration. Because majority of the wind farms with higher installed capacity intends to be connected into the transmission network of 220kV voltage level, their impacts are becoming more widespread. In the grid impact studies of wind power integration, voltage stability is the mostly concerned problem that will affect the operation and security of wind farms and power grid. Wind turbines based on induction generator would absorb reactive power from the grid when they inject the active power into the grid; the more active power injects the more reactive power they draw. The reactive power consumed by the power network would increase largely while the wind power transferred from the wind farm to the grid growing up. Wind turbines based on doubly fed induction generator owns the ability to regulate the reactive power. In general, the whole wind farm’s reactive power demand can be met with by the wind turbines equipped with DFIG to keep the reactive power exchange between the wind farms and grid neutral. But large wind power output of DFIG bases wind farm also leads to high reactive power consumption of the power network. Large reactive power consumption would lead to voltage stability margin decreases; voltage collapse would happen in the case of serious contingency when large amount of wind power injected into the grid. Countermeasures should be studied to ensure voltage stability and power system security in the high wind power penetration situation.

In this paper, The SVC with its controller model and pitch control model are use to mitigate the voltage instability arises from constant speed wind turbines and power converter controller model with transient voltage support capability and pitch control model are used to mitigate the voltage instability arises from variable speed wind turbines. Such additional controllers are implemented in the DIgSILENT/PowerFactory. The models effectiveness and the contribution to the voltage stability are verified by the power system simulation. From the power system simulation results, it can be illustrated for the constant speed wind turbines that SVC should assist the induction generator restoring the voltage rapidly in the duration of power system large disturbance, ensuring both the voltage stability of the grid and the continuous operation of the wind turbines; pitch control of constant speed wind turbines should effectively decrease the wind turbine mechanical power, preventing the wind turbines from over-speeding and transient voltage instability in the duration of power system large disturbance. Finally, the conclusion is presented that the adoption of SVC and pitch control enhances the transient voltage stability of induction generator based wind farm, ensures the continuous operation of wind turbines and the security and stability of the power network. For the variable speed wind turbines that power converter controller with transient voltage support capability should provide dynamic reactive power to support the grid voltage; the pitch control of variable speed wind turbines should effectively decrease the mechanical power, preventing the wind turbines from over-speeding in the duration of power system large disturbance. Finally, the conclusion is presented that the adoption of power converter controller with transient voltage support capability and pitch control enhances the transient voltage stability of the grid-connected wind farm, ensures the low voltage ride through capability of variable speed wind turbines equipped with DFIG and the security of the grid.

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