Research On Reactive Power Compensation And Reactive Power Price Of Power System With Large-scale Wind Generations

With the development of society,the population is increasing,the consumption of energy is increasing day by day.The fossil resources such as oil,coal and natural gas are not renewable,and a little less resources will be used.The use of fossil energy will also bring a lot of carbon monoxide,carbon dioxide,etc.The emission of gas,which pollutes the environment and causes the greenhouse effect,is particularly important for the development of renewable energy.Wind energy is a renewable energy source and does not cause any pollution to the environment.Therefore,wind power generation has developed rapidly in recent years.However,due to the uncertainty of the size and direction of the wind and the randomness,the volatility of wind power generation is very large.If the power system is to operate stably,the voltage of each node in the system should be within the specified range.The reactive power demand of the system can keep the voltage within the normal range.Therefore,the research on reactive power configuration and reactive power price is particularly important.The standard for reactive power tariff in China is: the power supply enterprise adopts the user for a certain period of time(most For the reactive power and active power used in January),the average power factor is obtained,and the power adjustment fee is charged.For customers with large power consumption,even if the amount of reactive power consumption is large,if the final calculated power is If the factor is greater than the power factor standard evaluation value,the reactive power cost consumed by the customer is not charged;but for the customer with small power consumption,even if the used active power is small and the reactive power consumed is not much,If the final calculated power factor is less than the power factor assessment standard,the user's reactive power charge will also be charged.This method makes the reactive power cost among the users.Lack of scientificity and rationality.The main work of this paper is as follows:Analyze the reactive power characteristics of each equipment when large-scale wind power is connected to the power system.Compare and analyze the working principle of static dynamic var generator(SVG)and static var compensator(SVC),economic benefits,operating costs,and reactive power.The compensation response time and the reactive power adjustment range were simulated and analyzed to verify the respective compensation effects.The reactive power compensation device of the Qingxi wind farm was selected as the static dynamic reactive power generator(SVG).The selected reactive power compensation method is analyzed in the Qingxi wind farm to test the effectiveness of reactive power compensation during operation,and whether the Qingxi wind farm considers the system capacity increase when reactive power is configured.The reactive power compensation of the Qingxi wind farm after capacity expansion is tested,and the reactive power compensation effect is tested to obtain the conclusion that the configured reactive power compensation device meets the system requirements.From the explicit cost of the reactive power generation device(generator and reactive power transmitter)and the cost of implicit analysis of reactive power pricing,the tracking method of reactive power flow and the calculation of the optimal power flow of wind power are introduced.Finally,the wind power is considered.The real-time reactive power price algorithm analyzes the algorithm against the actual grid data,analyzes the rationality of the model of the algorithm,and draws conclusions about the impact on the grid and users.