本文選題：脈沖負載 + 輸入電流脈動抑制��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：日前,航天器、雷達等功率具有脈沖特性的負載日益增多。當(dāng)直流脈沖負載工作時,直流輸入母線會產(chǎn)生較大的電流脈動,發(fā)生較大的輻射;此外,較大幅度的脈沖電流會引起蓄電池等儲能裝置較大的壓降,減小使用壽命,同時也對母線的穩(wěn)定度提出了更高的要求。本文針對脈沖負載工作時的功率特點,設(shè)計了兩種適用于脈沖負載的直流電源系統(tǒng),在輸出穩(wěn)壓的同時實現(xiàn)直流母線輸入電流低頻脈動的抑制。針對脈沖負載下直流電源輸入電流脈動較大的問題,本文選擇電容器作為中間能量緩沖單元,設(shè)計了Boost變換器和Buck變換器級聯(lián)的非隔離型混合儲能直流電源系統(tǒng)結(jié)構(gòu)。前級Boost變換器使用輸入電流直接控制,通過脈沖負載工作時所需的平均功率計算電流參考給定值,針對電源系統(tǒng)平均功率發(fā)生漂移時閉環(huán)可能失效的問題,本文提出了采用數(shù)字電位計自動調(diào)節(jié)輸入電流給定值的方法,較好的實現(xiàn)了直流母線低頻電流脈動抑制。為了實現(xiàn)輸入與輸出的隔離,設(shè)計了雙管正激變換器和Buck變換器級聯(lián)的隔離型混合儲能直流電源系統(tǒng)結(jié)構(gòu)。在雙管正激變換器中,本文提出了一種引入輸入電流低頻擾動的電壓型控制方法,以反向電流增益?zhèn)鬟f函數(shù)和輸出阻抗傳遞函數(shù)作為參考來設(shè)計閉環(huán)控制參數(shù),從而使前級輸出電容盡可能多的提供脈動功率,直流母線提供平均功率,實現(xiàn)直流電源母線輸入電流低頻脈動的抑制。在兩種有源混合直流系統(tǒng)當(dāng)中,后級Buck變換器均采用傳統(tǒng)的電壓閉環(huán)控制,在前級變換器輸出電壓變化時實現(xiàn)輸出電壓的穩(wěn)定以及脈沖負載變化時較好的動態(tài)響應(yīng)。在Saber軟件中進行時域仿真,并搭建硬件電路。通過仿真和實驗驗證了本文設(shè)計的兩種直流電源結(jié)構(gòu)以及控制電路工作于低頻脈沖負載工作模式的優(yōu)越性,均能實現(xiàn)輸入電流脈動小于電流平均值的?10%以及輸出電壓的較小波動。
[Abstract]:A few days ago, spacecraft, radar and other power with pulse characteristics of the load is increasing. When the DC pulse loads work, the DC input busbar will produce larger current pulsation and larger radiation. In addition, a larger pulse current will cause a larger voltage drop and reduce the service life of storage devices such as batteries. At the same time, the stability of the busbar is also required. According to the power characteristics of pulse load, two DC power supply systems suitable for pulse load are designed in this paper, which can suppress the low frequency pulsation of DC bus input current while output voltage is stabilized. In order to solve the problem of large pulsation of input current in DC power supply under pulse load, the capacitor is chosen as the intermediate energy buffer unit, and a non-isolated hybrid energy storage DC power supply system with cascaded Boost converters and Buck converters is designed in this paper. The former Boost converter uses input current to directly control, and the average power required by the pulse load is calculated by reference to the given value. In order to solve the problem of the closed-loop failure when the average power of the power supply system drifts, the input current is directly controlled. In this paper, a digital potentiometer is proposed to automatically adjust the input current, which can effectively suppress the low frequency current pulsation of DC bus. In order to realize the isolation of input and output, the isolated hybrid DC power supply system with cascaded two-transistor forward converter and Buck converter is designed. In this paper, a voltage mode control method with input current low frequency disturbance is proposed. The closed-loop control parameters are designed with the reference of reverse current gain transfer function and output impedance transfer function. Thus, the output capacitance of the front stage can provide as much pulsating power as possible, and the DC bus can provide the average power, so that the low frequency pulsation of the input current of DC power supply can be suppressed. In the two active hybrid DC systems, the conventional closed-loop voltage control is used in the rear stage Buck converter, which can stabilize the output voltage when the output voltage of the former converter changes and better dynamic response when the pulse load changes. The time domain simulation is carried out in Saber software, and the hardware circuit is built. The advantages of the two DC power supply structures designed in this paper and the control circuit working in the low frequency pulse load mode are verified by simulation and experiment. The input current pulsation is less than 10% of the average current and the output voltage fluctuates slightly.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46

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本文編號：1806869