發(fā)布時間：2018-12-20 13:35

【摘要】：公用電網(wǎng)的諧波污染日益嚴重,電力用戶對電能質(zhì)量的要求日益提高。有源電力濾波器因其優(yōu)良性能,被廣泛應用于諧波治理領(lǐng)域。傳統(tǒng)的基于電流檢測的有源電力濾波器通常只能對本地負荷進行就近補償,無法吸收電網(wǎng)中其他非線性負荷注入的諧波電流。本文的主要目的是研究一種虛擬電阻型有源電力濾波器,不必檢測負載電流,即可從電網(wǎng)吸收諧波電流;基于虛擬電阻型APF,提出一種新的諧波治理策略,可方便地界定用戶的治理或污染行為,并給以適當獎懲,從而可充分調(diào)動用戶治理諧波的積極性,達到改善電能質(zhì)量的目的。本文分析了基于瞬時無功功率理論的特定次數(shù)諧波檢測方法和基于FFT的諧波檢測方法;通過建立有源電力濾波器的數(shù)學模型,對電流環(huán)和電壓環(huán)的PI控制參數(shù)進行設(shè)計。本文針對傳統(tǒng)有源電力濾波器在多諧波源區(qū)域中治理諧波的局限性,提出一種基于電壓檢測的虛擬電阻型有源電力濾波器,這種APF僅需檢測系統(tǒng)各次諧波電壓,即可以有源諧波電阻的形式消納系統(tǒng)中的諧波電流,突破傳統(tǒng)APF的局限性。在虛擬電阻型APF的基礎(chǔ)上,本文提出一種新的諧波治理策略,虛擬電阻型APF通過調(diào)節(jié)各次等效諧波電阻阻值,使其吸收的各次諧波功率均達到最大值;主張以諧波功率的排放或吸收界定用戶污染者或治理者的角色,給予用戶相應的懲罰或獎勵,從而補償用戶吸收系統(tǒng)諧波電流而增加的成本,充分調(diào)動用戶主動治理諧波的積極性。在深入分析研究不同情況下最佳阻值取值條件的基礎(chǔ)上,本文提出一種基于一維搜索的最佳阻值自動調(diào)節(jié)方法,并針對系統(tǒng)電阻遠小于系統(tǒng)電抗的情況,提出一種基于系統(tǒng)阻抗計算的最佳阻值調(diào)節(jié)方法。仿真結(jié)果表明,虛擬電阻型有源電力濾波器在最佳阻值自動調(diào)節(jié)機制下,可快速調(diào)節(jié)各次等效諧波電阻達到最佳阻值,并且對系統(tǒng)諧波電壓、諧波電流均有顯著的治理效果。基于TMS320F2812 DSP設(shè)計虛擬電阻型有源電力濾波器實驗系統(tǒng),從主電路、控制電路、軟件程序等方面詳細介紹了其設(shè)計方法。實驗結(jié)果進一步證明虛擬電阻型有源電力濾波器在諧波治理中的作用。
[Abstract]:The harmonic pollution of public power network is becoming more and more serious. Active power filter (APF) is widely used in harmonic control field because of its excellent performance. The traditional active power filter based on current detection can only compensate the local load nearby and can not absorb the harmonic current injected by other nonlinear loads in the power network. The main purpose of this paper is to study a virtual resistive active power filter, which can absorb harmonic current from power network without detecting load current. Based on virtual resistive APF, a new harmonic control strategy is proposed, which can conveniently define the user's treatment or pollution behavior, and give appropriate rewards and punishments, thus fully arousing the enthusiasm of users to control harmonics and achieving the purpose of improving power quality. In this paper, the harmonic detection method based on instantaneous reactive power theory and the harmonic detection method based on FFT are analyzed, and the PI control parameters of current loop and voltage loop are designed by establishing the mathematical model of active power filter. In this paper, a virtual resistive active power filter based on voltage detection is proposed to overcome the limitation of the traditional active power filter in the multi-harmonic source region. This kind of APF only needs to detect the harmonic voltage of the system. That is, the active harmonic resistor can absorb the harmonic current in the system and break through the limitation of traditional APF. On the basis of virtual resistive APF, a new harmonic control strategy is proposed in this paper. Virtual resistor APF can achieve the maximum harmonic power by adjusting the equivalent harmonic resistance of each order. It is advocated that the role of user polluter or controller should be defined by the emission or absorption of harmonic power, and the corresponding punishment or reward should be given to the user, thereby compensating the user for the increased cost of absorbing harmonic current of the system. Fully mobilize the enthusiasm of users to actively manage harmonics. On the basis of in-depth analysis and study of the optimal resistance value conditions under different conditions, this paper presents an automatic control method of optimal resistance value based on one-dimensional search, and aims at the situation that the system resistance is far less than the system reactance. A method of optimal resistance regulation based on system impedance calculation is proposed. The simulation results show that the virtual resistive active power filter can quickly adjust the equivalent harmonic resistance of each order to achieve the optimal resistance under the optimal resistance automatic regulation mechanism, and the harmonic voltage and harmonic current of the system can be treated significantly. An experimental system of virtual resistive active power filter based on TMS320F2812 DSP is designed. The design method of virtual resistive active power filter is introduced in detail from main circuit, control circuit, software program and so on. The experimental results further prove the function of virtual resistive active power filter in harmonic control.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM761;TN713.8

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本文編號：2388068