發(fā)布時(shí)間：2019-05-21 18:09

【摘要】：分布式能源運(yùn)行受限于自然條件,發(fā)電具有間歇性,大量分布式能源的接入會(huì)使網(wǎng)絡(luò)上產(chǎn)生雙向功率流。傳統(tǒng)的單一集中式發(fā)電正逐漸向集中式、分布式并存的發(fā)電方式轉(zhuǎn)變,電能的單向流動(dòng)正變?yōu)槎嘞蛄鲃?dòng)方式。傳統(tǒng)的電力系統(tǒng)的配電運(yùn)行方式很難勝任這樣復(fù)雜的要求。以應(yīng)用于交直流混合微網(wǎng)、作為公共連接點(diǎn)為目標(biāo)設(shè)計(jì)電力電子變壓器,研究其拓?fù)�、控制和運(yùn)行特性,充分發(fā)揮電力電子變壓器的電氣隔離、功率主動(dòng)控制的功能,達(dá)到提供多電壓等級(jí)的交直流接口和減小電網(wǎng)諧波等目的,有助于新能源事業(yè)的發(fā)展,對(duì)交直流混合微網(wǎng)乃至能源互聯(lián)網(wǎng)的發(fā)展有著重要的意義。為確定以應(yīng)用于交直流混合微網(wǎng)、實(shí)現(xiàn)能量路由器為目標(biāo)設(shè)計(jì)的電力電子變壓器的拓?fù)浣Y(jié)構(gòu),依據(jù)現(xiàn)有對(duì)能源互聯(lián)網(wǎng)、能量路由器、電力電子變壓器的研究,選定了多模塊級(jí)聯(lián)拓?fù)浣Y(jié)構(gòu),采用更為靈活的基于移相控制的雙有源橋,進(jìn)而確定輸入級(jí)采用級(jí)聯(lián)H橋結(jié)構(gòu),中間級(jí)采用獨(dú)立的IBDC。確定拓?fù)浣Y(jié)構(gòu)后,在輸入級(jí)采用混合調(diào)制策略,該調(diào)制方式綜合了PWM和最近電平逼近的優(yōu)點(diǎn),降低了系統(tǒng)對(duì)各級(jí)聯(lián)單元對(duì)同步的要求,同時(shí)有利于實(shí)現(xiàn)功率的均衡控制。中間級(jí)采用移相控制方式,可通過(guò)控制原副邊電壓電流達(dá)到能量雙向控制的目的。同時(shí),針對(duì)中間級(jí)DC-DC運(yùn)行過(guò)程中出現(xiàn)的電壓反轉(zhuǎn)現(xiàn)象進(jìn)行詳盡的模態(tài)分析,提出了移相比、勵(lì)磁電感和死區(qū)時(shí)間之間應(yīng)滿(mǎn)足的配合關(guān)系,并通過(guò)仿真和實(shí)驗(yàn)對(duì)理論進(jìn)行了驗(yàn)證。在理論研究基礎(chǔ)上,研制了一臺(tái)單相380V/300V級(jí)聯(lián)多電平電力電子變壓器樣機(jī),給出了實(shí)驗(yàn)平臺(tái)和控制電路的設(shè)計(jì)思路,并分別針對(duì)PET各個(gè)部分進(jìn)行了可靠性驗(yàn)證,同時(shí)對(duì)所選用的參數(shù)設(shè)計(jì)方法和提出的控制方式進(jìn)行了實(shí)驗(yàn)驗(yàn)證。最后針對(duì)樣機(jī),進(jìn)行了抗擾動(dòng)試驗(yàn),結(jié)果表明,本文所設(shè)計(jì)的基于電力電子變壓器的能量路由器可以滿(mǎn)足電壓隔離、能量主動(dòng)雙向調(diào)控和控制諧波的目標(biāo),能長(zhǎng)時(shí)間穩(wěn)定可靠運(yùn)行,且能抵御網(wǎng)側(cè)電壓波動(dòng)干擾。
[Abstract]:Distributed energy operation is limited to natural conditions, power generation is intermittent, a large number of distributed energy access will make the network produce two-way power flow. The traditional single centralized power generation is gradually changing to centralized, distributed and co-existing generation mode, and the one-way flow of electric energy is becoming multi-directional flow mode. The traditional distribution operation mode of power system is difficult to meet such complex requirements. The power electronic transformer is designed for AC / DC hybrid microgrid as the common connection point, and its topology, control and operation characteristics are studied, so as to give full play to the functions of electrical isolation and active power control of power electronic transformer. To provide multi-voltage level AC / DC interface and reduce power grid harmonics is helpful to the development of new energy industry and is of great significance to the development of AC / DC hybrid microgrid and even energy Internet. In order to determine the topology of power electronic transformer designed for AC / DC hybrid microgrid and realize energy router, according to the existing research on energy Internet, energy router and power electronic transformer, The multi-module cascade topology structure is selected, and a more flexible double active bridge based on phase shift control is adopted, and then the input cascade H bridge structure is determined, and the independent IBDC. is used in the middle stage. After the topology is determined, the hybrid modulation strategy is adopted in the input stage, which combines the advantages of PWM and the nearest level approximation, reduces the synchronization requirements of the connected units at all levels, and is beneficial to the realization of power equilibrium control. The middle stage adopts phase shift control mode, which can control the voltage and current of the original secondary side to achieve the purpose of energy bidirectional control. At the same time, the modal analysis of voltage reversal phenomenon in the operation of intermediate stage DC-DC is carried out in detail, and the matching relationship between excitation inductance and dead time is put forward. The theory is verified by simulation and experiment. On the basis of theoretical research, a prototype of single-phase 380V/300V cascade multi-level power electronic transformer is developed, the design idea of experimental platform and control circuit is given, and the reliability of each part of PET is verified respectively. At the same time, the selected parameter design method and the proposed control method are verified by experiments. Finally, the disturbance rejection test is carried out for the prototype. The results show that the energy router based on power electronic transformer can meet the objectives of voltage isolation, energy active bidirectional control and harmonic control. It can run stably and reliably for a long time, and can resist the interference of voltage fluctuation on the network side.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TK01;TM41

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