本文選題：直流微電網(wǎng)　切入點：混合儲能系統(tǒng)　出處：《上海電力學院》2017年碩士論文　論文類型：學位論文

【摘要】：能源是人類賴以生存、經(jīng)濟發(fā)展和社會進步的基礎(chǔ),電力作為最清潔便利的能源形式,是國民經(jīng)濟發(fā)展的命脈,而傳統(tǒng)的化石能源已經(jīng)日益走向枯竭,且造成了巨大的環(huán)境污染。直流微電網(wǎng)以無需考慮頻率、相位、無功功率以及控制結(jié)構(gòu)簡單等優(yōu)點得到了各國專家學者的關(guān)注。本文研究了含風光混合儲能的直流微電網(wǎng)系統(tǒng),提出了基于實時功率控制的能量管理控制策略,主要內(nèi)容包括:首先,本文以含光伏電池、永磁同步風力發(fā)電機組、超級電容器、蓄電池及本地負荷組成的直流微電網(wǎng)為研究對象,根據(jù)直流微電網(wǎng)運行狀態(tài)的不同,將其分為并網(wǎng)運行和孤島運行兩種運行模態(tài)。設(shè)計了分布式電源、超級電容器和蓄電池組成的混合儲能、本地負荷及大電網(wǎng)不同工作狀態(tài)間的切換邏輯,使得各模塊通過本地控制系統(tǒng)在不同運行模式間平滑的切換,確保微電源、儲能裝置、負荷、大電網(wǎng)之間的功率實時平衡。其次,針對傳統(tǒng)的光伏電池MPPT控制策略跟蹤速度慢、穩(wěn)態(tài)功率波動大的缺點,本文提出了一種基于變功率擾動觀察法的光伏MPPT控制策略,擾動步長根據(jù)光伏電池輸出功率的變化而改變,通過仿真分析驗證了該控制策略的控制性能優(yōu)于常規(guī)的擾動觀察法。最后,針對常規(guī)的基于母線電壓信號(DBS)的直流微電網(wǎng)協(xié)調(diào)控制策略中母線電壓波動頻繁且穩(wěn)態(tài)波動范圍大,一方面降低了電網(wǎng)的電能質(zhì)量,另一方面可能造成系統(tǒng)不同運行模式間的頻繁切換,使系統(tǒng)的穩(wěn)定性和可靠性降低的問題,本文提出了基于實時功率控制的協(xié)調(diào)控制策略,以分布式電源輸出功率和負荷功率的差值為控制信號,來控制混合儲能的充放電功率大小及微網(wǎng)的運行模式,同時結(jié)合超級電容荷電狀態(tài)SOC大小來決定混合儲能的控制策略,使得微網(wǎng)內(nèi)的功率實時達到平衡。通過搭建的基于Matlab/Simulink模型,驗證了本文提出的控制策略的有效性和可靠性。
[Abstract]:Energy is the basis of human survival, economic development and social progress. As the cleanest and most convenient form of energy, electricity is the lifeblood of national economic development, and the traditional fossil energy has been increasingly depleted. The DC microgrid has attracted the attention of experts and scholars from all over the world because of its advantages of not considering frequency, phase, reactive power and simple control structure. In this paper, the DC microgrid system with mixed solar energy storage is studied. An energy management control strategy based on real-time power control is proposed. The main contents are as follows: firstly, this paper uses photovoltaic cells, permanent magnet synchronous wind turbines and supercapacitors. The DC microgrid composed of storage battery and local load is studied. According to the different operation state of DC microgrid, it is divided into two operation modes: grid-connected operation and isolated island operation. The hybrid energy storage composed of supercapacitor and battery, local load and switching logic between different working states of large power grid make each module switch smoothly between different operation modes through local control system, so as to ensure micro-power supply and energy storage device. Secondly, aiming at the disadvantages of the traditional MPPT control strategy of photovoltaic cells, such as slow tracking speed and large fluctuation of steady-state power, a photovoltaic MPPT control strategy based on variable power disturbance observation method is proposed in this paper. The disturbance step size is changed according to the output power of photovoltaic cell. Simulation results show that the control performance of the proposed control strategy is better than that of the conventional disturbance observation method. In the conventional coordinated control strategy of DC microgrid based on bus voltage signal (DBS), the bus voltage fluctuates frequently and the range of steady state fluctuation is large, on the one hand, it reduces the power quality of the power network. On the other hand, it may cause frequent switching between different operation modes of the system, and reduce the stability and reliability of the system. In this paper, a coordinated control strategy based on real-time power control is proposed. The difference between output power and load power of distributed power supply is used as the control signal to control the charge and discharge power of hybrid energy storage and the operation mode of microgrid. At the same time, the control strategy of hybrid energy storage is determined by combining the SOC size of supercapacitor charge state. The power balance in the microgrid is achieved in real time. The validity and reliability of the proposed control strategy are verified by building the Matlab/Simulink model.
【學位授予單位】：上海電力學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM727

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