發(fā)布時間：2018-03-23 20:14

  本文選題：直流微電網(wǎng)　切入點：主從控制　出處：《南京理工大學(xué)》2017年碩士論文

【摘要】：在能源需求和環(huán)境問題的雙重壓力下,為了充分發(fā)揮分布式發(fā)電的優(yōu)勢,減小分布式電源接入大電網(wǎng)時對大電網(wǎng)產(chǎn)生的供電可靠性及電能質(zhì)量方面的負面影響,微電網(wǎng)的概念由此提出。而伴隨著直流負荷越來越普遍的情況,損耗較小、可控性強的直流微電網(wǎng)具有很強的發(fā)展?jié)摿?對其的研究也越來越多。直流微電網(wǎng)分為孤島和并網(wǎng)兩種運行模式,實現(xiàn)兩種模式下的穩(wěn)定運行及平滑切換是必要的,因此研究直流微電網(wǎng)穩(wěn)定控制策略是十分重要的。直流微電網(wǎng)的穩(wěn)定控制主要分為兩塊內(nèi)容,一是直流微電網(wǎng)能量協(xié)調(diào)管理策略,二是直流母線電壓穩(wěn)定控制策略。本文首先介紹了直流微電網(wǎng)的概念,歸納了直流微電網(wǎng)的發(fā)展現(xiàn)狀和穩(wěn)定控制研究現(xiàn)狀。然后選取典型微電源,建立了光伏電池的數(shù)學(xué)實用模型,在得到光伏電池輸出特性曲線的基礎(chǔ)上采用了擾動觀察法實現(xiàn)了光伏電池的最大功率跟蹤;建立了蓄電池的通用數(shù)學(xué)模型,在Buck-Boost電路小信號分析的基礎(chǔ)上實現(xiàn)了蓄電池的充放電控制;對雙向DC/AC數(shù)學(xué)模型進行派克變換,實現(xiàn)了雙向DC/AC變流器恒直流母線電壓的解耦控制。其次,以直流微電網(wǎng)能量管理策略為研究對象,詳細分析了直流微電網(wǎng)主從控制策略,對蓄電池作為正常運行時主電源情況下的并網(wǎng)模式和孤島模式下的能量協(xié)調(diào)管理進行了分析,并對蓄電池退出運行時系統(tǒng)的能量管理進行了研究。以各變流器輸出未達到限流值為前提,對直流微電網(wǎng)并網(wǎng)正常運行、孤島運行、并網(wǎng)與孤島切換以及蓄電池退出時并網(wǎng)運行四種運行方式進行了仿真分析,驗證了主從控制策略的可行性。針對傳統(tǒng)PI控制無法滿足系統(tǒng)大擾動下直流母線電壓的穩(wěn)定性,對雙向Buck-Boost變流器提出了基于狀態(tài)反饋線性化的逆推滑�？刂�,通過仿真證明其響應(yīng)速度快、擴大了系統(tǒng)的穩(wěn)定區(qū)域的優(yōu)點;對雙向DC/AC變流器提出了自適應(yīng)逆推滑�？刂�,該方法能很好地跟蹤系統(tǒng)不確定參數(shù),具有響應(yīng)速度快、最大偏差量小的特點,系統(tǒng)的魯棒性得到了提升。
[Abstract]:Under the dual pressure of energy demand and environmental problems, in order to give full play to the advantages of distributed generation and reduce the negative impact on power supply reliability and power quality when distributed generation is connected to large power grid, The concept of microgrid is put forward. With the increasing prevalence of DC load, the DC microgrid with low loss and strong controllability has great potential for development. The DC microgrid is divided into two operation modes: isolated island and grid-connected, so it is necessary to realize stable operation and smooth switching between the two modes. Therefore, it is very important to study the stability control strategy of DC microgrid. The stability control of DC microgrid is mainly divided into two parts: one is the coordinated energy management strategy of DC microgrid. The second is the voltage stability control strategy of DC bus. Firstly, this paper introduces the concept of DC microgrid, summarizes the development status and stability control status of DC microgrid, and then selects the typical micro-power supply. A practical mathematical model of photovoltaic cell is established. Based on the output characteristic curve of photovoltaic cell, the maximum power tracking of photovoltaic cell is realized by perturbation observation method, and the general mathematical model of battery is established. On the basis of small signal analysis of Buck-Boost circuit, the charge and discharge control of battery is realized, and the decoupling control of constant DC bus voltage of bidirectional DC/AC converter is realized by using Pike transform to the mathematical model of bidirectional DC/AC. Taking the energy management strategy of DC microgrid as the research object, the master-slave control strategy of DC microgrid is analyzed in detail, and the coordinated energy management in grid-connected mode and islanding mode is analyzed. Based on the premise that the output of each converter does not reach the current limit value, the DC microgrid is connected to the grid normally, and the isolated island is operated, and the energy management of the system is studied when the battery is out of operation. The simulation analysis of four operation modes of grid-connected and islanded switching and grid-connected operation when battery exits is carried out, which verifies the feasibility of master-slave control strategy. The traditional Pi control can not meet the stability of DC busbar voltage under the large disturbance of the system. A sliding mode control based on state feedback linearization is proposed for the bidirectional Buck-Boost converter. The simulation results show that its response speed is fast and the stable region of the system is enlarged, and the adaptive backstepping sliding mode control is proposed for the bidirectional DC/AC converter. This method can track the uncertain parameters of the system well and has the characteristics of fast response speed and small maximum deviation. The robustness of the system is improved.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM727

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本文編號：1655011