【摘要】：為便于不同電壓等級(jí)的直流微源、負(fù)荷接入直流微電網(wǎng),設(shè)計(jì)了一種基于功率池的雙層母線直流微電網(wǎng),并提出了其協(xié)調(diào)控制策略。該微電網(wǎng)由2個(gè)電壓等級(jí)不同的獨(dú)立直流微電網(wǎng)通過功率池連接構(gòu)成。設(shè)置鋰電池作為功率池的能量后備,二者以級(jí)聯(lián)結(jié)構(gòu)構(gòu)成微網(wǎng)儲(chǔ)能調(diào)壓系統(tǒng)。詳細(xì)設(shè)計(jì)了兩直流子網(wǎng)與功率池之間、鋰電池組與功率池之間的功率交換機(jī)制,穩(wěn)定直流母線電壓,使兩子網(wǎng)互為備用,同時(shí)實(shí)現(xiàn)兩直流子網(wǎng)、鋰電池三者間低頻功率交換,避免了兩子網(wǎng)間高頻功率波動(dòng)的相互影響,并延長(zhǎng)了鋰電池的使用壽命。設(shè)計(jì)鋰電池荷電狀態(tài)調(diào)節(jié)機(jī)制,母線電壓穩(wěn)定時(shí)由直流子網(wǎng)對(duì)其進(jìn)行調(diào)節(jié),提高了微網(wǎng)持續(xù)運(yùn)行能力。最后,通過實(shí)驗(yàn)驗(yàn)證了所提出控制策略的有效性和可行性。
[Abstract]:In order to facilitate DC microsource with different voltage levels, a double-layer busbar DC microgrid based on power cell is designed and its coordinated control strategy is proposed. The microgrid consists of two independent DC microgrids with different voltage levels connected by power cells. The lithium battery is used as the energy reserve of the power cell, and the microgrid energy storage and regulating system is composed of cascaded structure. The power exchange mechanism between two DC subnet and power cell, lithium battery pack and power cell is designed in detail. The DC bus voltage is stabilized and the two subnets are used as backup. At the same time, the low frequency power exchange between the two DC subnets and the lithium battery is realized. The interaction of high frequency power fluctuation between the two subnets is avoided, and the service life of lithium battery is prolonged. The charging state adjustment mechanism of lithium battery is designed, which is regulated by DC subnet when the bus voltage is stable, which improves the continuous operation ability of the microgrid. Finally, the effectiveness and feasibility of the proposed control strategy are verified by experiments.
【作者單位】： 電力系統(tǒng)運(yùn)行與控制山西省重點(diǎn)實(shí)驗(yàn)室(太原理工大學(xué));
【基金】：山西省煤基重點(diǎn)科技攻關(guān)項(xiàng)目(MD2014-06) 山西省回國(guó)留學(xué)人員科研資助項(xiàng)目(2015-重點(diǎn)1)~~
【分類號(hào)】：TM727

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