Under the background of large-scale wind farms connected with power gird in China,for the hydrothermal power system,this paper combines with load characteristics’change of power grid connected with large-scale wind farms,proposes and analyzes a more close to the actual calculation method for peak load regulation ability,which is available for reference to the study on the actual peak load regulation ability of power grid connected with large-scale wind farms.
As the demand for renewable energy access to the grid grows gradually, the peaking function of thermal power unit in grid system is increasingly highlighted. This paper analyzed the security problems of thermal power unit load, and to carry out the load test at 8 units. We analyzed the safety index, including hearth negative pressure fluctuations, water-cooled wall temperature, axial displacement of turbine, and found that some existing units can achieve 60%-70% peaking capacity without flexibility transformation. The negative pressure of some units fluctuates greatly, which reflects the poor stability of the boiler in the low load stage.
Application of individual distributed generators can cause as many problems as it may solve. A better way to realize the emerging potential of distributed generation is to take a system approach which views generation and associated loads as a subsystem or a "microgrid". During disturbances, the generation and corresponding loads can separate from the distribution system to isolate the microgrid's load from the disturbance (providing UPS services) without harming the transmission grid's integrity. This ability to island generation and loads together has a potential to provide a higher local reliability than that provided by the power system as a whole. In this model it is also critical to be able to use the waste heat by placing the sources near the heat load. This implies that a unit can be placed at any point on the electrical system as required by the location of the heat load.