【摘要】：電力系統(tǒng)中的諧波問題受到廣泛關(guān)注,諧波的存在會使電能在生產(chǎn)和傳輸?shù)倪^程中利用率降低,使系統(tǒng)中電力設(shè)備發(fā)熱、振動并產(chǎn)生噪音,導(dǎo)致其絕緣老化,設(shè)備生命周期縮短,嚴(yán)重則可能引發(fā)故障或燒毀,還會嚴(yán)重的干擾電力系統(tǒng)外部的設(shè)備,因此諧波的治理具有重要的意義。有源電力濾波器(APF,active power filter)能動態(tài)地補償諧波和矯正功率因數(shù),被認(rèn)為是解決該問題的最有效手段。本文主要研究的是三相四線制并聯(lián)型有源電力濾波器數(shù)字控制器的設(shè)計與優(yōu)化,文中所做的工作主要為以下方面,第一,回顧了三相四線制并聯(lián)型有源電力濾波器的控制器設(shè)計的主要內(nèi)容。分析了其主功率拓?fù)洳⑼茖?dǎo)了基于同步旋轉(zhuǎn)坐標(biāo)系的電流環(huán)路、電壓環(huán)路離散數(shù)學(xué)模型。分析并設(shè)計了一種基于同步旋轉(zhuǎn)變換的負(fù)載諧波電流檢測算法。分析并設(shè)計了一種適用于三相四線制并聯(lián)型有源電力濾波器的簡化3D-SVPWM算法,相比于傳統(tǒng)的SVPWM算法,該算法極大縮減了運算過程,減輕運算負(fù)擔(dān);第二,具體分析了有源電力濾波器環(huán)路數(shù)字補償器的設(shè)計方法,其中包括電流環(huán)路的單零點補償器和單零點補償器與重復(fù)控制器并聯(lián)的復(fù)合補償器、電壓環(huán)路的單零點補償器設(shè)計;在系統(tǒng)設(shè)計方面,在分析有源電力濾波器實驗樣機的硬件信號連接的基礎(chǔ)上,提出了系統(tǒng)軟件設(shè)計框架,即應(yīng)用多線程、狀態(tài)機等設(shè)計方法對系統(tǒng)整體性能進(jìn)行優(yōu)化;同時提出了一種基于EDMA的人機通訊方案,進(jìn)一步優(yōu)化數(shù)字控制器的整體性能;第三,具體分析了直流側(cè)電壓與補償性能之間的關(guān)系,提出了有源電力濾波器直流側(cè)電壓的優(yōu)化運行點、第二階軟啟動的方法避免啟動時的沖擊電流以及修正電壓環(huán)路的離散數(shù)學(xué)模型以抑制補償器的6k次諧波,進(jìn)一步提高補償性能。最后,通過Simulink仿真以及實驗樣機上運行,驗證了上述理論與設(shè)計的正確性。結(jié)果表明,所設(shè)計的數(shù)字控制器能夠有效的利用系統(tǒng)資源,具有較好的補償性能,針對于直流側(cè)電壓的優(yōu)化設(shè)計可以在一定程度上進(jìn)一步提高有源電力濾波器的性能。
[Abstract]:The harmonic problem in power system is paid more and more attention. The existence of harmonics will reduce the utilization ratio of electric energy in the process of production and transmission, make the power equipment in the system heat, vibrate and produce noise, and lead to the insulation aging. If the life cycle of equipment is shortened, it may cause failure or burn down seriously, and it will also seriously interfere with the external equipment of power system, so it is of great significance to treat harmonics. Active power filter (APF,active power filter), which can dynamically compensate harmonic and correct power factor, is considered to be the most effective method to solve this problem. This paper mainly studies the design and optimization of digital controller of three-phase four-wire shunt active power filter. The main work in this paper is as follows: first, The main contents of controller design of three-phase four-wire shunt active power filter are reviewed. The main power topology is analyzed and the discrete mathematical models of current loop and voltage loop based on synchronous rotating coordinate system are derived. A load harmonic current detection algorithm based on synchronous rotation transformation is analyzed and designed. A simplified 3D-SVPWM algorithm suitable for three-phase four-wire shunt active power filter is analyzed and designed. Compared with the traditional SVPWM algorithm, the algorithm greatly reduces the operation process and reduces the computational burden. Secondly, the design method of digital compensator of active power filter loop is analyzed in detail, including single zero compensator of current loop and compound compensator of single zero compensator in parallel with repetitive controller. Design of single zero compensator for voltage loop; In the aspect of system design, on the basis of analyzing the hardware signal connection of the experimental prototype of active power filter, a system software design framework is proposed, which is to optimize the overall performance of the system by means of multithreading, state machine and other design methods. At the same time, a human-computer communication scheme based on EDMA is proposed to further optimize the overall performance of the digital controller. Thirdly, the relationship between DC side voltage and compensation performance is analyzed, and the optimal operation point of DC side voltage of active power filter is proposed. The second order soft start method avoids the impulse current at startup and modifies the discrete mathematical model of the voltage loop to suppress the 6k harmonics of the compensator and further improve the compensation performance. Finally, the correctness of the theory and design is verified by Simulink simulation and experimental prototype operation. The results show that the designed digital controller can utilize system resources effectively and has better compensation performance. The optimization design of DC voltage can further improve the performance of active power filter to a certain extent.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM761;TN713.8

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本文編號：2397275