Optimal dynamic load dispatching with the coordination of wind farm and AGC units

Due to the intermittent and uncertainty of wind power, power system net-load become more dynamic and unpredictive as the ramping events increase seriously with wind power penetration growing continuously. The change of net-load may deviate from the basis points of AGC, and more reserve capacity needed to be invoked to maintain the power balance, which will increase the operating cost of power system. To solve the problem, an dynamic load dispatching model and optimal strategy base on the AGC reserve capacity and marginal cost is proposed for the coordination dispatching of wind farm and AGC units. Within one minute time scale, the wind farm and AGC units adjust the operation set points according to the dynamic load dispatching results with the last updated wind power and load predication information. The participation factors of each AGC units and wind farm are optimized according to their marginal costs to cope with the net-load variation. From the results of New-England 39 bus test system, the dynamic net load can be tracked accurately and the operating cost can also be decreased at the same time.