并聯(lián)型有源電力濾波器諧波抑制性能優(yōu)化技術(shù)研究
發(fā)布時(shí)間：2018-08-03 19:08
【摘要】：配電系統(tǒng)電能質(zhì)量問(wèn)題日益得到人們的關(guān)注,電能質(zhì)量調(diào)節(jié)手段也在不斷地發(fā)展進(jìn)步。并聯(lián)型有源電力濾波器(Shunt Active Power Filter, SAPF)作為一種高效靈活的諧波治理裝置得到了廣泛研究和應(yīng)用,并且其功能也在不斷擴(kuò)展,向著綜合型的電能質(zhì)量調(diào)節(jié)裝置發(fā)展。本文以提高并聯(lián)型有源電力濾波器諧波抑制綜合性能為目標(biāo),從改進(jìn)輸出濾波器、減小輸出電流誤差、諧振阻尼復(fù)合控制策略以及對(duì)不同非線(xiàn)性負(fù)載諧波補(bǔ)償特性等方面深入研究有源電力濾波器諧波抑制性能優(yōu)化技術(shù)。 為了保證并聯(lián)型有源電力濾波器的諧波補(bǔ)償性能,首先必須保證其良好的輸出電流波形質(zhì)量,設(shè)計(jì)合理的輸出濾波器將起到關(guān)鍵作用。LCL濾波器由于可以用較小的輸出電感實(shí)現(xiàn)良好的開(kāi)關(guān)紋波抑制效果而被廣泛應(yīng)用,但通常需要采取有源阻尼或無(wú)源阻尼方法來(lái)抑制其自身諧振。有源阻尼控制可能需要采用額外的電壓電流傳感器,并且阻尼效果受控制系統(tǒng)帶寬的限制；傳統(tǒng)的無(wú)源阻尼方法則損耗較大,并且阻尼電阻會(huì)使開(kāi)關(guān)紋波濾除效果變差。為了避免這些問(wèn)題,本文基于選擇性無(wú)源阻尼思想提出了一種LCFL型輸出濾波器。這種LCFL濾波器通過(guò)在傳統(tǒng)無(wú)源阻尼LCL濾波器的阻尼電阻上并聯(lián)一條LC諧振支路而構(gòu)成,這條LC諧振支路調(diào)諧在開(kāi)關(guān)頻率,可以吸收大部分的開(kāi)關(guān)諧波電流,消除阻尼電阻對(duì)開(kāi)關(guān)諧波抑制性能的影響,同時(shí)將降低阻尼電阻的損耗。而在輸出濾波器的諧振頻率附近,LC支路的阻抗遠(yuǎn)大于阻尼電阻值,因而不會(huì)減弱其無(wú)源阻尼效果。采用LCFL濾波器的有源電力濾波器可以穩(wěn)定可靠地運(yùn)行,以較小的阻尼電阻損耗實(shí)現(xiàn)良好的開(kāi)關(guān)紋波濾除效果,從而改善有源電力濾波器的輸出波形質(zhì)量。 為提高有源電力濾波器的諧波電流補(bǔ)償精度,必須采用高性能的輸出電流跟蹤控制策略,同時(shí)應(yīng)消除造成輸出電流誤差的因素。本文中并聯(lián)型有源電力濾波器的輸出電流跟蹤控制采用PI與重復(fù)控制相結(jié)合的復(fù)合控制策略,以兼顧穩(wěn)態(tài)精度和動(dòng)態(tài)性能。然后分析了造成輸出電流誤差的因素,研究了輸出電流幅值和相位誤差對(duì)諧波補(bǔ)償性能的影響,在此基礎(chǔ)上提出了兩種輸出電流誤差補(bǔ)償方法。一種為具有相位補(bǔ)償功能的改進(jìn)型遞歸傅里葉變換(RDFT)諧波指令提取算法,通過(guò)在指令提取環(huán)節(jié)對(duì)輸出電流相位誤差進(jìn)行超前補(bǔ)償,以提高有源電力濾波器諧波補(bǔ)償精度。這種方法可以方便實(shí)現(xiàn)選擇性的諧波指令提取與誤差校正,具有較大的靈活性和補(bǔ)償精度。另外一種輸出誤差補(bǔ)償策略則基于電流指令誤差閉環(huán)調(diào)節(jié),在諧波同步旋轉(zhuǎn)坐標(biāo)系下提取相應(yīng)諧波分量的誤差直流量,然后進(jìn)行PI調(diào)節(jié)獲取指令誤差補(bǔ)償量,將其疊加在直接從負(fù)載電流中提取的諧波電流指令上以獲得完整的輸出電流指令。通過(guò)對(duì)諧波電流指令進(jìn)行補(bǔ)償,可以有效減小有源電力濾波器的輸出電流誤差,提高諧波補(bǔ)償精度。 配電系統(tǒng)同時(shí)接有無(wú)功補(bǔ)償電容器組和非線(xiàn)性負(fù)載情況下易發(fā)生諧波諧振,此時(shí)并聯(lián)型有源電力濾波器只進(jìn)行諧波電流補(bǔ)償難以達(dá)到較好的諧波抑制效果。為了提升并聯(lián)型有源電力濾波器在這種諧振條件下的諧波抑制性能,本文提出了一種諧波補(bǔ)償與諧振阻尼的復(fù)合控制方案。有源電力濾波器通過(guò)檢測(cè)負(fù)載電流提取諧波補(bǔ)償電流指令,通過(guò)檢測(cè)PCC電壓提取諧振阻尼電流指令,兩者綜合得到其總的輸出電流指令。通過(guò)建立等效電路模型分析了諧振產(chǎn)生與阻尼的機(jī)理,研究了并聯(lián)型有源電力濾波器諧波電流檢測(cè)位置對(duì)其諧波抑制性能的影響,同時(shí)檢驗(yàn)了有源電力濾波器諧波補(bǔ)償與諧振阻尼復(fù)合控制策略的效果。 針對(duì)在配電系統(tǒng)中應(yīng)用普遍的電壓源型與電流源型非線(xiàn)性負(fù)載,本文分析了并聯(lián)型有源電力濾波器對(duì)這兩類(lèi)非線(xiàn)性負(fù)載的諧波補(bǔ)償特性。通過(guò)分析發(fā)現(xiàn)并聯(lián)型有源電力濾波器補(bǔ)償電壓源型非線(xiàn)性負(fù)載諧波電流時(shí),會(huì)導(dǎo)致非線(xiàn)性負(fù)載發(fā)生嚴(yán)重的諧波電流放大效應(yīng),這將危害負(fù)載的正常運(yùn)行,同時(shí)降低并聯(lián)型有源電力濾波器的諧波補(bǔ)償性能。分析揭示了負(fù)載諧波放大倍數(shù)同系統(tǒng)阻抗與負(fù)載等效阻抗之間的關(guān)系,在此基礎(chǔ)上提出通過(guò)調(diào)節(jié)系統(tǒng)各部分的阻抗關(guān)系來(lái)減弱諧波放大效應(yīng),改善有源電力濾波器的諧波補(bǔ)償性能。仿真和實(shí)驗(yàn)結(jié)果驗(yàn)證了分析和所提出措施的正確性。 在以上分析和研究基礎(chǔ)上研制了三相三線(xiàn)并聯(lián)型有源電力濾波器樣機(jī),并且相關(guān)的有源電力濾波器裝置已經(jīng)在工業(yè)現(xiàn)場(chǎng)得到了應(yīng)用。實(shí)驗(yàn)和工業(yè)現(xiàn)場(chǎng)測(cè)試結(jié)果表明本文所提出的各項(xiàng)諧波抑制性能優(yōu)化技術(shù)可以在有源電力濾波器上得到良好的實(shí)現(xiàn)與應(yīng)用,對(duì)于提升其綜合諧波抑制性能發(fā)揮了較好的作用。希望本文的研究工作對(duì)有源電力濾波器的實(shí)用化推廣能起到一定的參考和促進(jìn)作用。
[Abstract]:The power quality problem of distribution system is getting more and more attention, and the means of power quality regulation are also developing. Parallel active power filter (Shunt Active Power Filter, SAPF) has been widely studied and used as a kind of efficient and flexible harmonic control device, and its function is also expanding, towards comprehensive type. In order to improve the harmonic suppression performance of the shunt active power filter, this paper aims to improve the harmonic suppression of active power filter from the improvement of the output filter, the output current error, the resonant damping compound control strategy and the harmonic compensation characteristics of different nonlinear loads. It can optimize technology.
In order to ensure the harmonic compensation performance of the shunt active power filter, the quality of the output current waveform must be guaranteed. The design of a reasonable output filter will play a key role in the.LCL filter, which is widely used because it can achieve good switching ripple effect with a small output inductor. Active damping or passive damping methods are used to suppress their resonance. Active damping control may require an additional voltage current sensor, and the damping effect is limited by the bandwidth of the control system; the traditional passive damping method is lost, and the damping resistor will make the switching ripple filtering effect worse. In order to avoid these problems, Based on the idea of selective passive damping, a LCFL type output filter is proposed. This kind of LCFL filter is made up of a LC resonant branch in parallel with the damping resistance of the traditional passive damping LCL filter. This LC resonant branch is tuned at the switching frequency, which can absorb the large part of the switching harmonic current and eliminate the damping resistance against the opening. At the same time, the damping resistance will be reduced and the loss of the damping resistance will be reduced. In the vicinity of the resonant frequency of the output filter, the impedance of the LC branch is far greater than the damping resistance value, thus it will not weaken its passive damping effect. The active power filter using the LCFL filter can run steadily and reliably with smaller damping resistance loss. It has good filtering effect of switching ripple, thus improving the output waveform quality of active power filter.
In order to improve the harmonic current compensation accuracy of active power filter, a high performance output current tracking control strategy must be adopted and the factors causing the output current error should be eliminated. The output current tracking control of the shunt active power filter in this paper uses a combined control strategy of PI and repetitive control to take account of the steady state of the power filter. The factors that cause the output current error are analyzed, and the influence of the amplitude and phase error of the output current on the harmonic compensation performance is studied. On this basis, two kinds of output current error compensation methods are proposed. A modified recursive Fourier transform (RDFT) harmonic instruction extraction algorithm with phase compensation function is proposed. In order to improve the harmonic compensation accuracy of the active power filter, the method can improve the harmonic compensation accuracy of the active power filter. This method can easily achieve the selective harmonic instruction extraction and error correction, and has greater flexibility and compensation precision. The other output error compensation strategy is based on the current instruction. The error closed loop adjustment is used to extract the error direct flow of the corresponding harmonic components in the harmonic synchronous rotating coordinate system, and then the PI adjustment is used to obtain the instruction error compensation, and it is superimposed on the harmonic current instruction extracted directly from the load current to obtain the complete output current instruction. It can reduce the output current error of active power filter and improve the accuracy of harmonic compensation.
Harmonic resonance is easy to occur in the case of reactive power compensation capacitor banks and nonlinear loads in the distribution system. At this time, the shunt active power filter can not achieve better harmonic suppression effect by only harmonic current compensation. In order to improve the harmonic suppression performance of the shunt active power filter under this resonant condition, this paper proposes to improve the harmonic suppression performance of the shunt active power filter. A hybrid control scheme for harmonic compensation and resonant damping is proposed. The active power filter extracts the harmonic compensation current instruction by detecting the load current and extracts the resonant damping current instruction by detecting the PCC voltage. Both of them get the total output current instruction. The resonance generation and damping are analyzed by the establishment of an equal effect circuit model. The effect of the harmonic current detection position on the harmonic suppression performance of the shunt active power filter is studied. At the same time, the effect of the harmonic compensation and the resonant damping control strategy of the active power filter is tested.
In order to apply the universal voltage source and current source nonlinear load in the distribution system, the harmonic compensation characteristics of the shunt active power filter for these two kinds of nonlinear loads are analyzed. It is found that the nonlinear load will lead to the nonlinear load when the shunt active power filter compensates the voltage source nonlinear load harmonic current. There is a serious harmonic current amplification effect, which will harm the normal operation of the load and reduce the harmonic compensation performance of the shunt active power filter. The analysis reveals the relationship between the load harmonic magnification and the impedance of the system and the equivalent impedance of the load. On this basis, the impedance relation of the various parts of the system is proposed to reduce the impedance. Weak harmonic amplification effect improves the harmonic compensation performance of APF. Simulation and experimental results verify the correctness of the analysis and proposed measures.
On the basis of the above analysis and research, a prototype of three-phase three wire shunt active power filter is developed, and the related active power filter device has been applied in the industrial field. The experimental and industrial field test results show that the harmonic suppression performance optimization techniques proposed in this paper can be obtained on the active power filter. Good implementation and application play a good role in improving the comprehensive harmonic suppression performance. I hope the research work in this paper can play a certain reference and promote the practical application of active power filter.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM761;TN713.8
本文編號(hào)：2162721
[Abstract]:The power quality problem of distribution system is getting more and more attention, and the means of power quality regulation are also developing. Parallel active power filter (Shunt Active Power Filter, SAPF) has been widely studied and used as a kind of efficient and flexible harmonic control device, and its function is also expanding, towards comprehensive type. In order to improve the harmonic suppression performance of the shunt active power filter, this paper aims to improve the harmonic suppression of active power filter from the improvement of the output filter, the output current error, the resonant damping compound control strategy and the harmonic compensation characteristics of different nonlinear loads. It can optimize technology.
In order to ensure the harmonic compensation performance of the shunt active power filter, the quality of the output current waveform must be guaranteed. The design of a reasonable output filter will play a key role in the.LCL filter, which is widely used because it can achieve good switching ripple effect with a small output inductor. Active damping or passive damping methods are used to suppress their resonance. Active damping control may require an additional voltage current sensor, and the damping effect is limited by the bandwidth of the control system; the traditional passive damping method is lost, and the damping resistor will make the switching ripple filtering effect worse. In order to avoid these problems, Based on the idea of selective passive damping, a LCFL type output filter is proposed. This kind of LCFL filter is made up of a LC resonant branch in parallel with the damping resistance of the traditional passive damping LCL filter. This LC resonant branch is tuned at the switching frequency, which can absorb the large part of the switching harmonic current and eliminate the damping resistance against the opening. At the same time, the damping resistance will be reduced and the loss of the damping resistance will be reduced. In the vicinity of the resonant frequency of the output filter, the impedance of the LC branch is far greater than the damping resistance value, thus it will not weaken its passive damping effect. The active power filter using the LCFL filter can run steadily and reliably with smaller damping resistance loss. It has good filtering effect of switching ripple, thus improving the output waveform quality of active power filter.
In order to improve the harmonic current compensation accuracy of active power filter, a high performance output current tracking control strategy must be adopted and the factors causing the output current error should be eliminated. The output current tracking control of the shunt active power filter in this paper uses a combined control strategy of PI and repetitive control to take account of the steady state of the power filter. The factors that cause the output current error are analyzed, and the influence of the amplitude and phase error of the output current on the harmonic compensation performance is studied. On this basis, two kinds of output current error compensation methods are proposed. A modified recursive Fourier transform (RDFT) harmonic instruction extraction algorithm with phase compensation function is proposed. In order to improve the harmonic compensation accuracy of the active power filter, the method can improve the harmonic compensation accuracy of the active power filter. This method can easily achieve the selective harmonic instruction extraction and error correction, and has greater flexibility and compensation precision. The other output error compensation strategy is based on the current instruction. The error closed loop adjustment is used to extract the error direct flow of the corresponding harmonic components in the harmonic synchronous rotating coordinate system, and then the PI adjustment is used to obtain the instruction error compensation, and it is superimposed on the harmonic current instruction extracted directly from the load current to obtain the complete output current instruction. It can reduce the output current error of active power filter and improve the accuracy of harmonic compensation.
Harmonic resonance is easy to occur in the case of reactive power compensation capacitor banks and nonlinear loads in the distribution system. At this time, the shunt active power filter can not achieve better harmonic suppression effect by only harmonic current compensation. In order to improve the harmonic suppression performance of the shunt active power filter under this resonant condition, this paper proposes to improve the harmonic suppression performance of the shunt active power filter. A hybrid control scheme for harmonic compensation and resonant damping is proposed. The active power filter extracts the harmonic compensation current instruction by detecting the load current and extracts the resonant damping current instruction by detecting the PCC voltage. Both of them get the total output current instruction. The resonance generation and damping are analyzed by the establishment of an equal effect circuit model. The effect of the harmonic current detection position on the harmonic suppression performance of the shunt active power filter is studied. At the same time, the effect of the harmonic compensation and the resonant damping control strategy of the active power filter is tested.
In order to apply the universal voltage source and current source nonlinear load in the distribution system, the harmonic compensation characteristics of the shunt active power filter for these two kinds of nonlinear loads are analyzed. It is found that the nonlinear load will lead to the nonlinear load when the shunt active power filter compensates the voltage source nonlinear load harmonic current. There is a serious harmonic current amplification effect, which will harm the normal operation of the load and reduce the harmonic compensation performance of the shunt active power filter. The analysis reveals the relationship between the load harmonic magnification and the impedance of the system and the equivalent impedance of the load. On this basis, the impedance relation of the various parts of the system is proposed to reduce the impedance. Weak harmonic amplification effect improves the harmonic compensation performance of APF. Simulation and experimental results verify the correctness of the analysis and proposed measures.
On the basis of the above analysis and research, a prototype of three-phase three wire shunt active power filter is developed, and the related active power filter device has been applied in the industrial field. The experimental and industrial field test results show that the harmonic suppression performance optimization techniques proposed in this paper can be obtained on the active power filter. Good implementation and application play a good role in improving the comprehensive harmonic suppression performance. I hope the research work in this paper can play a certain reference and promote the practical application of active power filter.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM761;TN713.8
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，本文編號(hào)：2162721
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