Study On The Allocation Ratio Of Wind-thermal & Energy Storage Of Wind-thermal Power HVDC Transmission System

For large-scale wind power grid dc transmission system for wind velocity fluctuations of wind power active power problem, proposed to wind fire store combined power of dc transmission scheme, and studies the three optimal matching.Each part is as follows:In chapter 2,for wind fire joint power dc storage sections of grid system to be delivered to the outside(doubly-fed wind power generator(DFIG), energy storage device and VSC- HVDC system) are introduced, analysis of working principle,control strategy and design, based on DIgSILENT/Power Factory platform built-in DFIG wind power generating unit, analyzes its rotor side converter(RSC) and pitch Angle of the system control scheme. Followed by building wind farms by way of HVDC and ac power grid model, respectively, for the end of the grid side short-circuit fault condition comparison test, verify the high voltage dc transmission system in the large scale wind power base in wind power transmission to remote load center project has the ability to improve the stability of the system.In chapter 3,in view of the large scale wind power dc way into several types of interconnected power grid was introduced and chosen based on the wind and fire after "networking" dc transmission way. To wind fire "baling" dc power transmission grid system design several different proportion scheme and simulation analysis was carried out on the working condition of wind speed fluctuations, respectively, by observing the stability of the system to send end and by the end of the power grid operation condition to select the optimal ratio of wind fire, and then combined with different capacity of energy storage devices to further analysis, under the working condition of wind speed fluctuations, determine the optimal ratio of wind fire reservoir.In chapter 4,according to the established wind power, thermal power and energy storage device matching scheme of wind fire joint power dc storage system to bedelivered to the outside side short-circuit fault in the power system of system simulation, operating mode and the local load change by dc transmission system of inverter control strategy as well as thermal power, the regulation of the active power energy storage device to reduce wind velocity fluctuation wind fire store the adverse effect of joint power dc transmission system and verify the wind fire three optimal proportion can improve the storage stability of large-scale wind power grid system.