本文選題：LCL濾波器　切入點(diǎn)：微電網(wǎng)　出處：《大連理工大學(xué)》2014年博士論文

【摘要】：隨著新能源的廣泛應(yīng)用,我國(guó)分布式發(fā)電系統(tǒng)得到了快速發(fā)展,由分布式發(fā)電系統(tǒng)組成的微電網(wǎng)系統(tǒng)越來(lái)越受到世界的關(guān)注�；贚CL濾波的微網(wǎng)逆變器控制策略的研究對(duì)于保障微電網(wǎng)的安全運(yùn)行,具有十分重要的工程實(shí)際意義,其關(guān)鍵性技術(shù)為：抑制LCL濾波器諧振尖峰的控制技術(shù)；電網(wǎng)不平衡狀態(tài)下網(wǎng)側(cè)電流控制技術(shù)、電網(wǎng)電壓有效值與同步相位檢測(cè)算法；解決微電網(wǎng)中分布式發(fā)電系統(tǒng)無(wú)功功率分配不準(zhǔn)確問(wèn)題的無(wú)功功率下垂系數(shù)校正技術(shù)。本文圍繞關(guān)鍵技術(shù),對(duì)基于LCL濾波器的微網(wǎng)逆變器的控制策略開(kāi)展理論與實(shí)驗(yàn)研究,研究成果可以應(yīng)用到實(shí)際工程中,對(duì)微電網(wǎng)的高效運(yùn)行具有一定的理論指導(dǎo)意義與實(shí)用價(jià)值。 本文分別建立了三相靜止坐標(biāo)系、兩相靜止坐標(biāo)系以及兩相同步旋轉(zhuǎn)坐標(biāo)系下的基于LCL濾波的微網(wǎng)逆變器數(shù)學(xué)模型�；谒⒌臄�(shù)學(xué)模型,分析LCL濾波器的諧振特性,并提出抑制諧振尖峰的方法。通過(guò)與被動(dòng)阻尼法比較,分析采用電容支路電流反饋代替連接阻尼電阻的方法和控制策略。針對(duì)其控制策略復(fù)雜的問(wèn)題,在詳細(xì)分析電網(wǎng)側(cè)電流反饋與逆變器側(cè)電流反饋閉環(huán)控制系統(tǒng)的內(nèi)在聯(lián)系基礎(chǔ)上,給出逆變器側(cè)電流反饋等效為電網(wǎng)側(cè)電流反饋加入電容支路電流反饋的有源阻尼的方法即無(wú)阻尼控制策略,避免了在電容支路增加電壓或電流傳感器的問(wèn)題,同時(shí)也簡(jiǎn)化了微網(wǎng)逆變器控制策略,為后續(xù)電網(wǎng)不平衡狀態(tài)下微網(wǎng)逆變器控制策略的研究提供理論基礎(chǔ)。 電網(wǎng)不平衡會(huì)對(duì)微網(wǎng)逆變器網(wǎng)側(cè)電流的控制、電網(wǎng)電壓有效值與同步相位的計(jì)算與檢測(cè)產(chǎn)生嚴(yán)重影響,造成逆變器工作異常,嚴(yán)重時(shí)損壞逆變器。本文在分析電網(wǎng)不平衡對(duì)微網(wǎng)逆變器控制影響的基礎(chǔ)上,采用PI控制器加入諧振(R)控制器的方法,調(diào)節(jié)電壓負(fù)序分量引起的100Hz交流量靜差。由于諧振控制器的加入,使微網(wǎng)逆變器的控制策略復(fù)雜化,為了避免增大系統(tǒng)控制復(fù)雜程度。本文提出電網(wǎng)電壓前饋的控制策略,將電網(wǎng)電壓前饋到控制回路中,實(shí)現(xiàn)消除電網(wǎng)電壓對(duì)網(wǎng)側(cè)電流控制的影響,進(jìn)而消除電壓負(fù)序分量對(duì)網(wǎng)側(cè)電流的影響。電網(wǎng)電壓有效值的計(jì)算方面,本文提出基于低通濾波器的電壓有效值計(jì)算方法,該方法只需一個(gè)瞬時(shí)電壓采樣值就可以得出電網(wǎng)電壓有效值,相對(duì)于全周期采樣法、導(dǎo)數(shù)法以及迭代法更加的便捷,并且適用于電網(wǎng)不平衡狀態(tài)。電網(wǎng)不平衡對(duì)電網(wǎng)電壓同步相位的檢測(cè)具有嚴(yán)重影響,本文提出一種電網(wǎng)基波正序電壓的提取方法,運(yùn)用數(shù)學(xué)變換方法能夠在電網(wǎng)不平衡甚至畸變狀態(tài)下,提取基波正序分量,從而進(jìn)行電壓同步相位檢測(cè)控制。該算法通過(guò)兩次數(shù)學(xué)變換消除電壓負(fù)序及諧波分量,得到基波正序電壓分量,避免了諧振控制器的加入,減小系統(tǒng)復(fù)雜度。對(duì)電網(wǎng)不平衡狀態(tài)下微網(wǎng)逆變器控制策略的研究,為實(shí)現(xiàn)微電網(wǎng)具有應(yīng)對(duì)電網(wǎng)電壓跌落和系統(tǒng)不平衡的能力的運(yùn)行要求提供了理論支持。 本文通過(guò)分析下垂控制的原理,針對(duì)下垂控制有功、無(wú)功功率不能夠完全解耦、無(wú)功功率分配不準(zhǔn)確等問(wèn)題,提出微電網(wǎng)逆變器下垂控制系數(shù)校正算法,與虛擬阻抗控制算法有機(jī)結(jié)合,達(dá)到有功、無(wú)功功率完全解耦提高無(wú)功功率分配準(zhǔn)確度的效果。仿真結(jié)果有效驗(yàn)證這種方法的正確性與可行性。 最后,本文研制容量為250kVA的基于LCL濾波的微網(wǎng)逆變器樣機(jī),該逆變器采用低通濾波器法計(jì)算電網(wǎng)電壓有效值,數(shù)學(xué)變換方法獲取電網(wǎng)電壓同步相位,并且運(yùn)用電壓前饋控制與無(wú)阻尼控制相結(jié)合的控制策略,實(shí)現(xiàn)無(wú)功功率補(bǔ)償、黑啟動(dòng)、聯(lián)網(wǎng)運(yùn)行模式切換到孤島運(yùn)行模式、根據(jù)用戶(hù)需求對(duì)儲(chǔ)能器件蓄電池進(jìn)行恒功率、恒電壓、恒電流多種策略充放電、電網(wǎng)不平衡時(shí)對(duì)網(wǎng)側(cè)電流有效控制等功能。在所研制樣機(jī)的基礎(chǔ)上,進(jìn)行多種工況的實(shí)驗(yàn)研究,實(shí)驗(yàn)結(jié)果證明了本文所提微網(wǎng)逆變器控制策略的有效性與正確性。
[Abstract]:With the wide application of new energy, distributed power generation system in China has been rapid development, composed of distributed power generation system of micro grid system more and more attention of the world. The safe operation of microgrid inverter control strategy for the protection of LCL filter based on micro grid, has very important practical significance, and its key technology as control technology to inhibit LCL filter resonance peak; unbalanced grid state grid side current control technology, power grid voltage value and synchronous phase detection algorithm; to solve the reactive power droop coefficient correction technology in micro grid distributed power system reactive power distribution is not accurate. This paper focuses on key technologies, on the theory and experimental study on the control strategy of microgrid inverter based on LCL filter, the research results can be applied to the actual project, efficient transport of micro grid It has a certain theoretical guiding significance and practical value.
This paper established the three-phase static coordinate system, two-phase stationary coordinate system and the two-phase synchronous rotating coordinate system of the micro grid inverter mathematical model based on LCL filter. Based on the mathematical model, the analysis of resonant LCL filter, and puts forward the method of inhibiting the resonant peak. By the comparison and analysis of passive damping method, using capacitor branch current feedback control strategy and method instead of connecting damping resistance. The control strategy of complex problems in a detailed analysis of the grid side current feedback and the inverter side current feedback loop control system based on the internal relations, gives the inverter side current feedback method is equivalent to the grid side current feedback capacitor with active damping of the branch current feedback no damping control strategy, to avoid increasing the voltage or current sensor in the capacitor, but also simplifies the microgrid inverter control The strategy provides a theoretical basis for the study of the control strategy of the microgrid inverter in the unbalance state of the power grid.
Unbalanced grid to control micro grid inverter grid side current, grid voltage effective value calculation and seriously affect detection and phase synchronization, resulting in inverter disorder, serious damage. The inverter based on the analysis of the power imbalance on the basis of microgrid inverter control. The effects of using PI controller (R) with resonant controller the 100Hz method, AC voltage regulation of negative sequence components caused by static error. Due to the resonant controller, the control strategy of micro grid inverter is complicated, in order to avoid increasing the complexity of system control. The proposed control strategy for grid voltage feed-forward, the grid voltage feedforward control loop to eliminate the voltage on. The impact of the net side current control, and eliminate the influence of voltage negative sequence components of the grid current. The calculation of the effective value of the voltage of the power network, this paper based on the low-pass filter The calculation method of effective value of voltage, this method only needs an instantaneous voltage sampling value can be drawn on the effective value of voltage, relative to the full period sampling method, derivative method and iterative method is more convenient, and is suitable for the unbalanced state. The power imbalance has severely affected the detection of grid voltage synchronization phase, is proposed in this paper. An extraction method of grid positive sequence voltage, using the mathematical method in unbalanced grid distortion even under the condition of extracting the fundamental positive sequence and synchronous phase detection, voltage control. The algorithm through two mathematical transformation to eliminate voltage negative sequence and harmonic components, obtained positive sequence voltage components, avoid adding resonant controller the complexity of the system is reduced. The unbalanced state of microgrid inverter control strategy research for the realization of the micro grid with the grid voltage drop and The operational requirements of the system's unbalanced capability provide theoretical support.
This paper analyzes the principle of droop control, the droop control active and reactive power can not be completely decoupled, the problem of reactive power distribution is not accurate, the micro grid inverter droop coefficient correction algorithm, to achieve active and virtual impedance control combination algorithm, reactive power decoupling to improve the accuracy of reactive power distribution the simulation results verify the effective effect. The feasibility and validity of this method.
Finally, this paper developed the capacity for micro grid inverter prototype based on LCL filter 250kVA, the inverter using low pass filter method to calculate the effective value of voltage, mathematical transformation method to obtain the grid voltage synchronization phase, and the control strategy of voltage feedforward control and damping control combination, to achieve reactive power compensation, black start network operation mode switching to islanded operation mode, according to the user demand for energy storage battery device of constant power, constant voltage, constant current charge and discharge of a variety of strategies, effectively control the function of network side current unbalance in power grid. Based on the developed prototype, experimental study on various conditions, experimental results prove the provided the inverters control effectiveness and correctness of the strategy.

【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM464

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本文編號(hào)：1695039