本文選題：直流微網(wǎng) + 濾波器　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：為了解決分布式發(fā)電容量和成本的限制及控制困難等問題,微電網(wǎng)應(yīng)運(yùn)而生。目前,微電網(wǎng)主要采用交流微電網(wǎng)形式,但直流微網(wǎng)憑借其成本低、效率高、可靠性和可控性高及供電容量大等優(yōu)勢得到了迅猛發(fā)展。本文對直流微網(wǎng)的建模、穩(wěn)定性及能量協(xié)調(diào)控制等問題進(jìn)行了研究。首先,分析了直流微網(wǎng)的構(gòu)成和各單元的工作原理及控制方式。為了最大限度地利用可再生能源,風(fēng)光發(fā)電單元運(yùn)行在最大功率點(diǎn)追蹤(Maximum Power Point Tracking,MPPT)模式。其中,光伏發(fā)電單元采用與恒值法結(jié)合的占空比擾動觀測法實(shí)現(xiàn)MPPT,永磁直驅(qū)風(fēng)力發(fā)電單元采用最佳葉尖速比法實(shí)現(xiàn)MPPT。蓄電池儲能系統(tǒng)采用兩段式充電和恒壓放電控制策略以維持孤島運(yùn)行時系統(tǒng)的功率平衡。其次,研究了并網(wǎng)變流器(Grid-Connected Converter,GCC)的雙向運(yùn)行特性,并設(shè)計(jì)和優(yōu)化了雙向LCL濾波器參數(shù)。本文分別設(shè)計(jì)了中點(diǎn)箝位式(Neutral Point Clamped,NPC)三電平整流器和逆變器電網(wǎng)側(cè)的LCL濾波器參數(shù),以得到雙向NPC三電平變流器電網(wǎng)側(cè)LCL濾波器參數(shù)的取值范圍。為了提高GCC的雙向運(yùn)行性能,依據(jù)電網(wǎng)電流總諧波失真(Total Harmonic Distortion,THD)、調(diào)節(jié)時間和穩(wěn)定裕度對雙向LCL濾波器參數(shù)進(jìn)行了優(yōu)化。然后,根據(jù)直流微網(wǎng)各單元接口變換器的控制方式把各單元接口變換器分為控制母線側(cè)端口電壓的變換器(Bus Voltage Controlled Converter,BVCC)和控制母線側(cè)端口電流的變換器(Bus Current Controlled Converter,BCCC),建立了各接口變換器的小信號模型。在此基礎(chǔ)上計(jì)算并分析了各接口變換器的阻抗特性。依據(jù)通用阻抗判據(jù)和Nyquist穩(wěn)定性判據(jù)研究了不同運(yùn)行狀態(tài)下直流微網(wǎng)的穩(wěn)定性,并在Matlab/Simulink仿真平臺上搭建了風(fēng)光互補(bǔ)直流微網(wǎng)仿真模型進(jìn)行了實(shí)驗(yàn)驗(yàn)證。最后,分析了直流微網(wǎng)的運(yùn)行特性,并進(jìn)行了基于直流母線電壓的能量協(xié)調(diào)控制策略研究。當(dāng)直流微網(wǎng)并網(wǎng)運(yùn)行時,GCC作為電壓節(jié)點(diǎn),控制直流母線電壓和系統(tǒng)功率平衡;當(dāng)直流微網(wǎng)孤島運(yùn)行時,根據(jù)直流母線電壓和蓄電池荷電量(State of Charge,SOC)的變化確定直流母線電壓的控制策略。
[Abstract]:In order to solve the problem of limitation and control of distributed generation capacity and cost, microgrid emerges as the times require. At present, microgrid mainly adopts the form of AC microgrid, but DC microgrid has been developed rapidly because of its advantages of low cost, high efficiency, high reliability and controllability, and large power supply capacity. In this paper, the modeling, stability and energy coordination control of DC microgrid are studied. Firstly, the composition of DC microgrid and the working principle and control mode of each unit are analyzed. In order to maximize the use of renewable energy, the wind power generation unit operates in the maximum power point tracking (MPPT) mode. Among them, the MPPTs are realized by the duty cycle perturbation observation method combined with the constant value method, and the MPPTs are realized by the optimal blade tip velocity ratio method in the PMSU. The battery energy storage system adopts two stage charging and constant voltage discharge control strategy to maintain the power balance of the isolated island operation system. Secondly, the bidirectional operation characteristics of Grid-Connected Converters (Grid-Connected Converters) are studied, and the parameters of bidirectional LCL filters are designed and optimized. In this paper, the LCL filter parameters of neutral-point clamped three-level rectifier and inverter are designed, respectively, to obtain the range of LCL filter parameters on the grid side of bi-directional NPC three-level converter. In order to improve the bidirectional performance of GCC, the parameters of the bidirectional LCL filter are optimized according to the total Harmonic distortion (THD) of the total harmonic distortion of the current in the power network, the adjustment time and the stability margin. And then, According to the control mode of each unit interface converter in DC microgrid, each unit interface converter is divided into bus Voltage Controlled converter and bus Current Controlled converter. Small signal model of port converter. On this basis, the impedance characteristics of each interface converter are calculated and analyzed. Based on the universal impedance criterion and Nyquist stability criterion, the stability of DC microgrid in different operating states is studied, and the simulation model of wind and wind complementary DC microgrid is built on the Matlab/Simulink simulation platform for experimental verification. Finally, the operation characteristics of DC microgrid are analyzed, and the energy coordination control strategy based on DC bus voltage is studied. When DC microgrid is connected to grid, GCC is used as voltage node to control DC bus voltage and system power balance. The control strategy of DC bus voltage is determined according to the change of DC bus voltage and battery charge state of charge of SOC.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM727;TM743

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本文編號：1917320