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Research On Energy Management And Coordinated Control Strategy Of Battery Storage Power Station

Posted on:2019-06-02Degree:MasterType:Thesis
Country:ChinaCandidate:Y S XueFull Text:PDF
GTID:2382330548470551Subject:Engineering
Abstract/Summary:PDF Full Text Request
Energy storage technology is effective for the grid to accept more renewable energy.Battery energy storage has become one of the leading development directions because of its unique performance.Due to the randomness of renewable energy,the method to stabilize the power fluctuations and track its planned output with limited energy storage capacity in real time becomes one of the difficulties.In addition,with the expansion of the storage power station,coordination control technology has also become one of the difficulties.In view of the above difficulties,this thesis studies the energy management and coordination control strategy of battery storage power station from the control level,power station level and power distribution level.The main contents are as follows:(1)At the control level,the stability of multi-parallel energy storage power converter system(PCS)under PI control is analyzed,a fully decoupled control strategy is proposed in the dq coordinate system.Then,the multi-parallel PCS model with grid impedance is established by Norton equivalent circuit,and the reason of the instability of the multi-parallel PCS is found by the Routh criterion,and the stability criterion is given.(2)At the power station level,the energy management strategy for energy storage power station assisting renewable energy to stabilize the fluctuation and track the generation schedule is studied.Based on the state of charge(SOC),the methods with SOC adjustment for energy storage system to stabilize fluctuation and track the generation schedule are proposed.(3)At power distribution level,the coordinated control strategy of multiple battery packs in energy storage power station is studied.The control target with the least number of switching times between charging and discharging state and the least SOC variance is established.Then,the method of selecting the power of each battery pack through limiting the maximum allowable variance of SOC is proposed.Through this strategy,the switching times between charging and discharging states of each battery pack is suppressed,and the operating cost of the battery storage station is reduced.(4)The power distribution software of energy storage power station is written based on MATLAB GUI.To calculate the reasonable power of each battery according to the built-in algorithm in the software for different functions can be achieved.
Keywords/Search Tags:battery energy storage, parallel stability, stabilizing fluctuation, tracking schedule, power distribution, coordinated control
PDF Full Text Request
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