本文選題：電子負(fù)載 + 負(fù)載模擬器��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：隨著電源技術(shù)的飛速發(fā)展,電源類產(chǎn)品的種類層出不窮,電源類產(chǎn)品的需求不斷提高,它們的故障有時會給人們的生產(chǎn)生活帶來不便甚至巨大的損失。因此,一般出廠前都要對這些電源類產(chǎn)品根據(jù)其性能需求做相應(yīng)的^/載測試。傳統(tǒng)的帶載測試采用靜態(tài)阻抗方法,這種方法存在諸多缺點(diǎn),如負(fù)載形式比較單一,靈活性較差,能量大都以熱能形式耗散等,已經(jīng)越來越不能滿足電源的性能測試需求,隨之,電子負(fù)載作為一種新型的負(fù)載形式已成為一種趨勢。本文研究的能量回饋型直流電子負(fù)載針對的被測直流電源輸出電壓25V~28.5V,額定功率5kW,額定電流175A,電流紋波在5%以內(nèi)。被測直流電源輸出電壓低,電流大,為了實現(xiàn)能量回饋功能,需要將最高28.5V的低電壓升至650V,要求電子負(fù)載電路具有高升壓比功能,因此,電子負(fù)載的電路拓?fù)溥x為三級結(jié)構(gòu)。本文將對該具有三級電路拓?fù)浣Y(jié)構(gòu)的能量回饋型直流電子負(fù)載的控制算法進(jìn)行設(shè)計,包括負(fù)載模擬電流跟蹤控制策略、逆變并網(wǎng)控制策略,使系統(tǒng)能夠靈活的模擬各種形式的負(fù)載并將能量回饋到電網(wǎng)。1、介紹所要研究能量回饋型直流電子負(fù)載的三級拓?fù)浣Y(jié)構(gòu)各部分電路在系統(tǒng)中的作用;根據(jù)系統(tǒng)功能,分析能饋型直流電子負(fù)載的工作原理。2、在電子負(fù)載負(fù)載模擬原理的基礎(chǔ)上設(shè)計直流電子負(fù)載的工作模式。輸入側(cè)電流控制采用PI控制,使電子負(fù)載輸入側(cè)電流準(zhǔn)確快速跟蹤指令電流變化,利用三階最佳設(shè)計方法對PI參數(shù)進(jìn)行設(shè)計,實現(xiàn)直流電子負(fù)載靈活模擬各種負(fù)載形式的功能。3、從能量回饋型電子負(fù)載后級能量回饋的功能出發(fā),分析三相電壓型PWM逆變器(VSI)變換器的控制目標(biāo),選擇電流型控制方式,確定變換器輸出電流作為被控制量。在此基礎(chǔ)上設(shè)計一套完整的三相VSI變換器并網(wǎng)控制策略,并對控制參數(shù)進(jìn)行設(shè)計,實現(xiàn)入網(wǎng)電流的單位功率因數(shù)并網(wǎng)。4、用MATLAB/simulink對所設(shè)計的控制算法進(jìn)行仿真驗證,并在實驗平臺上進(jìn)行實驗驗證,記錄實驗數(shù)據(jù)與實驗波形,所得波形和數(shù)據(jù)表明所設(shè)計的控制算法能夠達(dá)到預(yù)期的目標(biāo)。
[Abstract]:With the rapid development of power technology, the kinds of power products emerge one after another, the demand of power products is increasing constantly, their faults sometimes bring inconvenience to people's production and life, even huge losses. Therefore, these power supply products should be tested according to their performance requirements before they leave the factory. The traditional static impedance method is used in load testing. This method has many disadvantages, such as single load form, poor flexibility, energy dissipation in the form of thermal energy, etc., which has become more and more unable to meet the performance test requirements of power supply. As a new type of load, electronic load has become a trend. The output voltage of the measured DC power supply is 25V / 28.5 V, the rated power is 5kW, the rated current is 175A, and the current ripple is less than 5%. The measured DC power supply has low output voltage and large current. In order to realize the energy feedback function, it is necessary to raise the maximum low voltage of 28.5V to 650V, which requires the electronic load circuit to have the function of high boost ratio. Therefore, the circuit topology of the electronic load is chosen as the tertiary structure. In this paper, the control algorithm of the energy feedback DC electronic load with three-level circuit topology is designed, including the load analog current tracking control strategy, the inverter grid-connected control strategy. So that the system can simulate various forms of load flexibly and feedback energy to the power grid. The paper introduces the function of the three-level topology circuit of the energy feedback DC electronic load in the system; according to the function of the system, The working principle of the energy fed DC electronic load is analyzed and the working mode of the DC electronic load is designed on the basis of the simulation principle of the electronic load. Pi control is used to control the input current of the input side, which makes the input current of the electronic load track the change of the instruction current accurately and quickly. The Pi parameters are designed by using the third-order optimal design method. This paper realizes the function of DC electronic load to simulate all kinds of load forms flexibly. Starting from the function of energy feedback electronic load, this paper analyzes the control target of three-phase voltage source PWM inverter and chooses the current mode control mode. The output current of the converter is determined as the controlled quantity. On the basis of this, a complete control strategy of three-phase VSI converter is designed, and the control parameters are designed to realize the grid-connected unit power factor of the input current. The designed control algorithm is simulated and verified by MATLAB / Simulink. The experimental data and waveforms are recorded on the experimental platform, and the results show that the proposed control algorithm can achieve the desired goal.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN86

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本文編號：2049950