Study Of Energy Saving Dispatch Under Conditional Risk Constraints In Wind Power Integrated System

The assurance of the balance of energy supplying and demanding, andcomprehensive treatment of the serious environmental pollution issues, which haverisen to a national development strategy. Power industry, as the main energy consumerand exhaust pollution emitter, is in extraordinary need of energy-saving dispatch.Especially the wind power generation (WPG), as a renewable energy generation withno pollution and no emission, has been listed as one of the green energy industriesheavily supported by the nation. Therefore, it has been particularly significant tooptimize dispatch by combining wind power with conventional power plant.Whereas, the inherent stochastic volatility and intermittent of wind energy havebecome the barrier of the development of wind power. The uncertainty of the WPGbrings the security of power system some uncertain risks. So the motivation of theresearch in this thesis comes from the question how to consider the optimizationdispatch with uncertain factors. Weibull two-parameter is used to predict thedistribution of wind speed in this thesis. Then simulates the output of wind powerthrough the conversion relationship between wind speed and wind power. In the lightof nonlinear of conventional power flow equations as well as existence convergenceand iterative problem within flow calculation, DC flow is used to approximatelinearization. Edites DC trend program to analyze the trend of the network, then,calculates distribution of the load rate of each branch. In order to solve randomsecurity constraints, this paper refers to the theory of conditional value at risk tomeasure the probability constraint that the load rate of each branch does not meet thesecurity requirements. Dispatching objective function includes the cost of thermalpower and wind power costs. Among them, for the cost of thermal power generatingunits, this paper considers coal costs and environmental costs; for the wind turbine,operation costs and risk reserve costs are taken into account in this thesis. Eventuallythe energy-saving optimization dispatch model with random security constrains inwind power integrated system is built.Based on the modified IEEE-6 node system and the IEEE-30 node system aftermodified as model testing example, this thesis carries on a large amount of calculationand analysis to prove the practicality and reasonability of the new method. Byscientific analysis of different confidence levels, different wind forces, different risk constraints degrees on dispatching decision influence. This thesis verifies that theproposed model has good practical value, The results in this paper can be used as thepolicy guidance and reference of the systematically optimized operation .