【摘要】：針對獨(dú)立運(yùn)行直流微電網(wǎng),提出了含負(fù)荷功率自動分配的協(xié)調(diào)控制策略。孤島運(yùn)行狀態(tài)下,直流微電網(wǎng)需獨(dú)自承擔(dān)系統(tǒng)電壓穩(wěn)定,為此采用多組小容量儲能單元平衡分布式電源(DG)和負(fù)荷功率從而控制母線電壓穩(wěn)定。同時(shí),為了避免儲能系統(tǒng)過充和過放以及降低對通訊的依賴程度,根據(jù)各儲能單元的荷電狀態(tài)(SOC)和最大功率設(shè)計(jì)自適應(yīng)下垂控制自動協(xié)調(diào)不同儲能單元之間的負(fù)荷功率分配,可減小電壓波動。當(dāng)儲能系統(tǒng)充電功率超過其最大允許功率或滿充時(shí),不同DG單元根據(jù)各自最大輸出功率由最大功率跟蹤控制(MPPT)切換為帶有電壓前饋補(bǔ)償?shù)南麓箍刂颇Ｊ椒�(wěn)定母線電壓和自動分配負(fù)荷功率,并考慮各單元的輸出阻抗來提高分配精度。最后利用Matlab/Simulink對所設(shè)計(jì)的控制策略在不同運(yùn)行模式下進(jìn)行仿真驗(yàn)證,仿真結(jié)果表明所提出的控制策略可協(xié)調(diào)不同模式下獨(dú)立直流微電網(wǎng)穩(wěn)定運(yùn)行和實(shí)現(xiàn)負(fù)荷功率自動分配。
[Abstract]:A coordinated control strategy for independent operation of DC microgrid is proposed in this paper. In the condition of isolated island operation, the DC microgrid has to bear the voltage stability of the system alone. In order to control the voltage stability of the bus, several small capacity energy storage units are used to balance the distributed power supply (DG) and load power. At the same time, in order to avoid overcharge and overplay of energy storage system and reduce the dependence on communication, adaptive sag control is designed to automatically coordinate the load power distribution among different energy storage units according to the charge state (SOC) and maximum power design of each energy storage unit. The voltage fluctuation can be reduced. When the charging power of the energy storage system exceeds its maximum permissible power or when it is fully charged, According to their maximum output power, different DG cells switch from maximum power tracking control (MPPT) to sag control mode with voltage feedforward compensation to stabilize bus voltage and automatically distribute load power. The output impedance of each unit is considered to improve the distribution accuracy. Finally, the designed control strategy is simulated under different operation modes by using Matlab/Simulink. The simulation results show that the proposed control strategy can coordinate the stable operation of the independent DC microgrid in different modes and realize the automatic load distribution.
【作者單位】： 上海電力學(xué)院電氣工程學(xué)院;國網(wǎng)安徽省電力公司蚌埠供電公司;天津大學(xué)電氣與自動化工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(61403246) 上海教委科研創(chuàng)新項(xiàng)目(15ZZ085) 中國博士后科學(xué)基金研究項(xiàng)目(2014M560187) 上海綠色能源并網(wǎng)工程技術(shù)研究中心項(xiàng)目資助(13DZ2251900)~~
【分類號】：TM727

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