并聯(lián)型有源電力濾波器的電流檢測和無差拍控制方法的研究
發(fā)布時間：2018-11-04 14:53
【摘要】：諧波是目前影響電能質(zhì)量的主要因素，各種諧波治理手段也相繼被提出，其中有源電力濾波器（Active Power Filter，APF）作為抑制諧波最為有效的裝置，其關(guān)鍵技術(shù)包括：諧波電流的檢測算法和補償電流的跟蹤控制策略。本文以并聯(lián)型有源電力濾波器（Shunt Active Power Filter，SAPF）為對象，，就其兩方面的關(guān)鍵技術(shù)進行展開研究。 諧波電流的檢測方面，針對傳統(tǒng)ip iq檢測法中由低通濾波器（Low Pass Filter，LPF）引起的延遲問題進行分析，結(jié)合傅立葉分解法，提出了一種改進的積分檢測法，利用延時、積分環(huán)節(jié)取代傳統(tǒng)的LPF，大大縮短了APF從投入到正常工作的運行時間；且在三相不對稱系統(tǒng)中，只需進行簡單的三角函數(shù)變換，就可以靈活地運用該方法，與傳統(tǒng)的構(gòu)造法相比，結(jié)果說明該方法可以減小了系統(tǒng)的延遲，具有一定的優(yōu)越性。 補償電流的跟蹤控制方面，舍棄了傳統(tǒng)的跟蹤型控制方法，采用預測型的無差拍控制法（Dead-Beat Control）。在數(shù)字系統(tǒng)中，基于三相三線制SAPF的數(shù)學模型，建立系統(tǒng)的狀態(tài)空間方程，利用電壓空間矢量脈寬調(diào)制技術(shù)（Space Vector Pulse WidthModulation，SVPWM），將對指令電流的控制轉(zhuǎn)化對電壓的控制，借用無差拍控制在逆變器中的應用原理，化簡狀態(tài)方程，再將對諧波電流的預測轉(zhuǎn)化為對負載電流的預測，通過重復預測器提前一拍預測。直流側(cè)采用簡單的PI控制，選定合適的參數(shù)，實現(xiàn)對直流側(cè)電容電壓穩(wěn)定性的控制。 最后，采用Matlab仿真軟件，在Simulink下搭建系統(tǒng)的仿真模型，確定仿真參數(shù)，對文中提出的諧波檢測方法和補償電流的控制策略進行仿真實驗，并將仿真結(jié)果與傳統(tǒng)的方法進行比較，驗證文中所提方法的有效性和準確性。
[Abstract]:Harmonic is the main factor affecting power quality at present, and various harmonic control methods have been proposed one after another, among which the active power filter (Active Power Filter,APF) is the most effective device to suppress harmonics. The key technologies include harmonic current detection algorithm and compensation current tracking control strategy. In this paper, two key technologies of shunt active power filter (Shunt Active Power Filter,SAPF) are studied. In the aspect of harmonic current detection, the delay problem caused by low pass filter (Low Pass Filter,LPF) in the traditional ip iq detection method is analyzed, and an improved integral detection method is proposed by using the Fourier decomposition method. The integral link replaces the traditional LPF, and greatly shortens the running time of APF from input to normal operation. In the three-phase asymmetric system, the simple trigonometric function transformation can be used flexibly. Compared with the traditional construction method, the results show that the method can reduce the delay of the system and has some advantages. In the tracking control of compensation current, the traditional tracking control method is abandoned, and the predictive beat free control method (Dead-Beat Control).) is adopted. In the digital system, based on the mathematical model of three-phase three-wire SAPF, the state space equation of the system is established, and the control of the instruction current is transformed into the control of the voltage by using the voltage space vector pulse width modulation (Space Vector Pulse WidthModulation,SVPWM) technology. Based on the application principle of deadbeat control in inverter, the equation of state is simplified, and then the prediction of harmonic current is transformed into the prediction of load current, and a beat prediction is made ahead of time by repeated predictor. The DC side is controlled by simple PI control and appropriate parameters are selected to control the voltage stability of the DC side capacitance. Finally, the simulation model of the system is built under Simulink with Matlab software, and the simulation parameters are determined. The harmonic detection method and the control strategy of compensating current are simulated, and the simulation results are compared with the traditional methods. The validity and accuracy of the proposed method are verified.
【學位授予單位】：江南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN713.8;TM73
本文編號：2310165
[Abstract]:Harmonic is the main factor affecting power quality at present, and various harmonic control methods have been proposed one after another, among which the active power filter (Active Power Filter,APF) is the most effective device to suppress harmonics. The key technologies include harmonic current detection algorithm and compensation current tracking control strategy. In this paper, two key technologies of shunt active power filter (Shunt Active Power Filter,SAPF) are studied. In the aspect of harmonic current detection, the delay problem caused by low pass filter (Low Pass Filter,LPF) in the traditional ip iq detection method is analyzed, and an improved integral detection method is proposed by using the Fourier decomposition method. The integral link replaces the traditional LPF, and greatly shortens the running time of APF from input to normal operation. In the three-phase asymmetric system, the simple trigonometric function transformation can be used flexibly. Compared with the traditional construction method, the results show that the method can reduce the delay of the system and has some advantages. In the tracking control of compensation current, the traditional tracking control method is abandoned, and the predictive beat free control method (Dead-Beat Control).) is adopted. In the digital system, based on the mathematical model of three-phase three-wire SAPF, the state space equation of the system is established, and the control of the instruction current is transformed into the control of the voltage by using the voltage space vector pulse width modulation (Space Vector Pulse WidthModulation,SVPWM) technology. Based on the application principle of deadbeat control in inverter, the equation of state is simplified, and then the prediction of harmonic current is transformed into the prediction of load current, and a beat prediction is made ahead of time by repeated predictor. The DC side is controlled by simple PI control and appropriate parameters are selected to control the voltage stability of the DC side capacitance. Finally, the simulation model of the system is built under Simulink with Matlab software, and the simulation parameters are determined. The harmonic detection method and the control strategy of compensating current are simulated, and the simulation results are compared with the traditional methods. The validity and accuracy of the proposed method are verified.
【學位授予單位】：江南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN713.8;TM73
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