【摘要】：為研究光儲聯(lián)合發(fā)電系統(tǒng)的黑啟動能力,本文采用光儲系統(tǒng)啟動廠用異步電動機的方法模擬電網(wǎng)黑啟動過程。首先對光伏電池、儲能電池的數(shù)學(xué)模型及原理進行了詳細(xì)分析,建立了適用于黑啟動的光儲聯(lián)合發(fā)電系統(tǒng),并對其單元結(jié)構(gòu)的模型及原理進行分析。在此基礎(chǔ)上,研究了黑啟動時光儲聯(lián)合發(fā)電系統(tǒng)的有功功率、無功功率控制,考慮到因儲能剩余充電容量不足可能造成黑啟動失敗的情況,基于常規(guī)MPPT(Maximum Power Point Tracking)控制算法原理,提出了一種負(fù)荷跟蹤與MPPT協(xié)調(diào)控制策略。該控制策略能夠有效控制光伏出力,使出力充足時有效跟蹤負(fù)荷變化,無多余功率向儲能充電;出力不足時實現(xiàn)最大功率跟蹤,聯(lián)合儲能共同為負(fù)荷供電,減小了所需的儲能容量,為成功黑啟動提供保障。然后明確了黑啟動條件下光伏子系統(tǒng)與儲能子系統(tǒng)的控制目標(biāo),建立了光伏控制子系統(tǒng)和儲能控制子系統(tǒng)。光伏子系統(tǒng)前級DC/DC變換器采用最大功率跟蹤/負(fù)荷跟蹤控制,后級DC/AC逆變器采用電壓電流雙環(huán)控制,控制直流側(cè)母線電壓穩(wěn)定,負(fù)責(zé)向系統(tǒng)負(fù)荷供電,不參與系統(tǒng)調(diào)頻;儲能子系統(tǒng)前級雙向DC/DC變換器采用直流母線電壓控制,實現(xiàn)儲能充放電控制,后級DC/AC逆變器采用恒壓恒頻控制平抑光伏系統(tǒng)出力波動,為系統(tǒng)提供電壓與頻率支撐。最后在Matlab/Simulink環(huán)境中搭建光儲聯(lián)合發(fā)電系統(tǒng)仿真模型,通過仿真驗證了本文所提負(fù)荷跟蹤與MPPT協(xié)調(diào)控制策略的可行性和有效性,同時驗證了光儲聯(lián)合發(fā)電系統(tǒng)能夠為大電網(wǎng)的恢復(fù)提供黑啟動電源,具備快速黑啟動能力。
[Abstract]:In order to study the black-start ability of optical storage combined generation system, this paper uses the method of induction motor to simulate the black-start process of power grid. Firstly, the mathematical model and principle of photovoltaic cell and energy storage cell are analyzed in detail, and the light storage combined generation system suitable for black start is established, and the model and principle of its unit structure are analyzed. On this basis, the active power and reactive power control of black-start time storage combined generation system is studied. Based on the principle of conventional MPPT (Maximum Power Point Tracking) control algorithm, a coordinated control strategy for load tracking and MPPT is proposed. The control strategy can effectively control the photovoltaic output force, make the sufficient output force to effectively track the load change, no excess power charged to the energy storage; When the output is insufficient, the maximum power tracking is realized, and the combined energy storage supplies the load together, which reduces the required energy storage capacity and provides the guarantee for the successful black start. Then, the control objectives of photovoltaic subsystem and energy storage subsystem under black start are defined, and the photovoltaic control subsystem and energy storage control subsystem are established. The front-stage DC/DC converter of photovoltaic subsystem adopts maximum power tracking / load tracking control, while the back stage DC/AC inverter adopts voltage and current double loop control, which controls the DC bus voltage stability and is responsible for supplying power to the system load. Not participating in system FM; The DC bus voltage control is used to realize the charge and discharge control in the front stage DC/DC converter of the energy storage subsystem. The latter stage DC/AC inverter uses constant voltage and constant frequency control to stabilize the force fluctuation of the photovoltaic system, which provides the voltage and frequency support for the system. Finally, the simulation model of optical storage combined generation system is built in Matlab/Simulink environment, and the feasibility and effectiveness of the proposed coordinated control strategy of load tracking and MPPT are verified by simulation. At the same time, it is verified that the optical storage combined generation system can provide black start power for the restoration of large power grid, and has the ability of fast black start.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM61

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