具有共模漏電流抑制能力的單相無變壓器型光伏逆變技術(shù)研究
發(fā)布時間：2018-12-18 06:16
【摘要】：近年來,全球環(huán)境污染與能源短缺等問題不斷加劇,世界各國紛紛從戰(zhàn)略的角度加強(qiáng)扶持清潔可再生能源的發(fā)展。太陽能光伏發(fā)電因其資源豐富、清潔高效的特點而受到了廣泛的關(guān)注。隨著光伏發(fā)電行業(yè)相關(guān)技術(shù)的深入發(fā)展,光伏發(fā)電系統(tǒng)的成本不斷降低,全球的光伏裝機(jī)總量持續(xù)攀升。光伏發(fā)電技術(shù)的應(yīng)用也已經(jīng)進(jìn)入了由政策驅(qū)動逐漸向市場驅(qū)動的過渡階段。但是,光伏發(fā)電系統(tǒng)前期投入高,成本回收周期長,因此如何進(jìn)一步地降低系統(tǒng)成本,提高系統(tǒng)的發(fā)電效率及其可靠性,進(jìn)而縮短投資回收周期成為了光伏發(fā)電行業(yè)最為關(guān)注的問題。在戶用型分布式光伏并網(wǎng)發(fā)電系統(tǒng)中,無變壓器型逆變器因成本低、電能轉(zhuǎn)換效率高的優(yōu)點而倍受用戶以及光伏系統(tǒng)集成商的青睞。但是,在無變壓器型系統(tǒng)中,并網(wǎng)逆變器與光伏電池板的寄生電容以及電網(wǎng)會構(gòu)成共�；芈�,若并網(wǎng)系統(tǒng)的共模電壓存在高頻脈動,則會在回路中產(chǎn)生不可忽視的共模漏電流,導(dǎo)致并網(wǎng)逆變系統(tǒng)無法滿足并網(wǎng)標(biāo)準(zhǔn)中關(guān)于共模漏電流限值的規(guī)定。 本文圍繞無變壓器型光伏并網(wǎng)系統(tǒng)中的共模漏電流問題展開研究。文章分析了無變壓器型電路的共模漏電流抑制條件,得到了兩類具有共模漏電流抑制能力的單相拓?fù)浣Y(jié)構(gòu)：基于對稱電感配置的電路結(jié)構(gòu)和基于非對稱電感配置的電路結(jié)構(gòu)。繼而從這兩種電路結(jié)構(gòu)分別出發(fā),探索具有共模漏電流抑制能力的單相逆變電路的形成方法以及共模漏電流的優(yōu)化方案。 首先,論文從高性能的HERIC電路推導(dǎo)得到了基于對稱電感配置結(jié)構(gòu)的混合全橋電路。通過對混合全橋電路的基本工作模態(tài)的分析,證明了該電路具有共模漏電流抑制能力的結(jié)論。在此基礎(chǔ)上,文中給出了混合全橋電路的PWM控制方法,并且分析了該PWM控制策略下的混合全橋電路的工作特性。討論了濾波電感不對稱、開關(guān)動作不同步等電路非理想因素對電路的共模特性造成的影響,并給出了工程化時的共模特性優(yōu)化方法。對比了混合全橋電路結(jié)構(gòu)與其他對稱電感配置電路的電路特性,強(qiáng)調(diào)了混合全橋電路的工業(yè)應(yīng)用價值。并搭建了3kW的實驗測試平臺,驗證了混合全橋結(jié)構(gòu)的正確性。 其次,論文分析了電路中的寄生參數(shù)以及參數(shù)差異性對基于對稱電感結(jié)構(gòu)的無變壓器型逆變電路中的共模漏電流的影響,并且以highly efficient and reliable inverter concept (HERIC)電路為例,給出了系統(tǒng)寄生參數(shù)相關(guān)的共模諧振電路模型,得到高頻共模電壓擾動與電路寄生參數(shù)之間的關(guān)系�；谏鲜龇治�,提出了進(jìn)一步消除系統(tǒng)高頻共模漏電流的共模電壓箝位結(jié)構(gòu),并且將該結(jié)構(gòu)運用于已有的全橋型對稱電感配置電路進(jìn)行優(yōu)化,有效降低了已有拓?fù)浞桨钢械墓材ｋ妷旱母哳l擾動,減小了電路寄生參數(shù)對系統(tǒng)共模漏電流的影響。并以基于有源電壓箝位的HERIC電路為例,驗證了共模電壓箝位結(jié)構(gòu)的有效性。 再次,提出了一種基于非對稱電感配置結(jié)構(gòu)的帶有飛跨電容結(jié)構(gòu)的多電平電路。該電路由飛跨電容三電平Buck結(jié)構(gòu)與工頻換相結(jié)構(gòu)組合而成,不僅繼承了多電平電路轉(zhuǎn)換效率高、濾波電感小的優(yōu)點,而且保留了工頻換相結(jié)構(gòu)對電路中的高頻共模漏電流的抑制能力,降低了電路直流輸入電壓。通過對該電路的工作模態(tài)的分析,提出了相對應(yīng)的PWM控制方法。然后從優(yōu)化電路轉(zhuǎn)換效率和功率密度的角度出發(fā),給出了電路中參數(shù)的設(shè)計方法,并通過實驗測試平臺,驗證了該電路的工作特性。 最后,運用上述理論,結(jié)合并網(wǎng)標(biāo)準(zhǔn)以及安全規(guī)范,設(shè)計完成了具有高可靠性、高轉(zhuǎn)換效率的3kW的單相非隔離光伏并網(wǎng)逆變器產(chǎn)品,該產(chǎn)品經(jīng)過實踐論證與第三方機(jī)構(gòu)的評測,已基本達(dá)到了工業(yè)界主流產(chǎn)品的水平。
[Abstract]:In recent years, the problems of global environmental pollution and energy shortage have been increasing, and the countries of the world have stepped up the development of supporting clean renewable energy from a strategic point of view. The solar photovoltaic power generation has received extensive attention due to its rich resources and high efficiency. With the deep development of the related technologies of the photovoltaic power generation industry, the cost of the photovoltaic power generation system is continuously reduced, and the total amount of the photovoltaic installation in the world continues to climb. The application of PV power generation technology has also entered a transition period driven by policy to market. However, the initial investment of the photovoltaic power generation system is high and the cost recovery period is long, so the system cost can be further reduced, the power generation efficiency and the reliability of the system can be improved, and the investment recovery period is shortened to become the most important problem in the photovoltaic power generation industry. In the household-type distributed photovoltaic grid-connected power generation system, the non-transformer type inverter is highly favored by the users and the integrator of the photovoltaic system because of the advantages of low cost and high conversion efficiency of the electric energy. in the transformer-free system, however, the parasitic capacitance of the grid-connected inverter and the photovoltaic cell panel and the power grid form a common-mode loop, The grid inverter system can not meet the requirements of the common mode leakage current limit in the network standard. In this paper, a research on the leakage current of the co-mode in a non-transformer type photovoltaic grid-connected system In this paper, the common mode leakage current suppression condition of the non-transformer type circuit is analyzed, and two types of single-phase topological structure with common mode leakage current suppression capability are obtained: the circuit structure based on the symmetric inductance configuration and the circuit junction based on the asymmetric inductance configuration The method of forming a single-phase inverter circuit with a common-mode leakage current suppression capability and an optimization method of the total-mode leakage current are explored from the two circuit structures, respectively. First, the thesis derives the hybrid system based on the symmetric inductance configuration structure from the high-performance HERIC circuit. Based on the analysis of the basic working mode of the hybrid full bridge circuit, it is proved that the circuit has a common mode leakage current suppression capability In this paper, the PWM control method of the hybrid full bridge circuit is given, and the work of the hybrid full bridge circuit under the PWM control strategy is analyzed. The influence of non-ideal factors such as the asymmetry of the filter inductance and the non-synchronization of the switch action on the model property of the circuit is discussed, and the model of the model is also given. The circuit characteristics of the hybrid full bridge circuit structure and other symmetrical inductance configuration circuits are compared, and the industry of the hybrid full bridge circuit is emphasized. The experiment test platform of 3kW is set up, and the hybrid full bridge structure is verified. In this paper, the influence of the parasitic parameters and the difference of the parameters on the leakage current in the non-transformer type inverter circuit based on the symmetric inductance structure is analyzed. In this paper, the model of the common mode resonant circuit related to the parasitic parameters of the system is given, and the disturbance of the high-frequency co-mode voltage and the parasitic parameters of the circuit are obtained. Based on the above-mentioned analysis, the common mode voltage and position structure of the high-frequency co-mode leakage current of the system is further eliminated, and the structure is optimized by using the existing full-bridge type symmetrical inductance configuration circuit, so that the common mode voltage in the existing topological scheme is effectively reduced, the high-frequency disturbance of the system is reduced, the parasitic parameter of the circuit is reduced, the system co-mode leakage is reduced, The effect of the current is verified by using the HERIC circuit based on the active voltage and the level of the active voltage. In this paper, an asymmetric inductor-based configuration with a flying-span capacitor junction is proposed. The circuit is formed by combining a three-level Buck structure of a flying capacitor and a power-frequency phase-changing structure, not only inherits the advantages of high conversion efficiency of the multi-level circuit and small filter inductance, but also retains the high-frequency co-mode leakage in the circuit of the power frequency switching structure the power of the current is reduced, the electricity is reduced, The DC input voltage of the circuit is based on the analysis of the working mode of the circuit. The design method of the parameters in the circuit is given from the angle of the conversion efficiency and the power density of the optimized circuit. Finally, using the above theory, combined with the network standard and the safety specification, the single-phase non-isolated photovoltaic grid-connected inverter product with high reliability and high conversion efficiency is designed, and the product has been proved by practice. The evaluation of the third-party organization has basically reached the work level.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM615;TM464
本文編號：2385484
[Abstract]:In recent years, the problems of global environmental pollution and energy shortage have been increasing, and the countries of the world have stepped up the development of supporting clean renewable energy from a strategic point of view. The solar photovoltaic power generation has received extensive attention due to its rich resources and high efficiency. With the deep development of the related technologies of the photovoltaic power generation industry, the cost of the photovoltaic power generation system is continuously reduced, and the total amount of the photovoltaic installation in the world continues to climb. The application of PV power generation technology has also entered a transition period driven by policy to market. However, the initial investment of the photovoltaic power generation system is high and the cost recovery period is long, so the system cost can be further reduced, the power generation efficiency and the reliability of the system can be improved, and the investment recovery period is shortened to become the most important problem in the photovoltaic power generation industry. In the household-type distributed photovoltaic grid-connected power generation system, the non-transformer type inverter is highly favored by the users and the integrator of the photovoltaic system because of the advantages of low cost and high conversion efficiency of the electric energy. in the transformer-free system, however, the parasitic capacitance of the grid-connected inverter and the photovoltaic cell panel and the power grid form a common-mode loop, The grid inverter system can not meet the requirements of the common mode leakage current limit in the network standard. In this paper, a research on the leakage current of the co-mode in a non-transformer type photovoltaic grid-connected system In this paper, the common mode leakage current suppression condition of the non-transformer type circuit is analyzed, and two types of single-phase topological structure with common mode leakage current suppression capability are obtained: the circuit structure based on the symmetric inductance configuration and the circuit junction based on the asymmetric inductance configuration The method of forming a single-phase inverter circuit with a common-mode leakage current suppression capability and an optimization method of the total-mode leakage current are explored from the two circuit structures, respectively. First, the thesis derives the hybrid system based on the symmetric inductance configuration structure from the high-performance HERIC circuit. Based on the analysis of the basic working mode of the hybrid full bridge circuit, it is proved that the circuit has a common mode leakage current suppression capability In this paper, the PWM control method of the hybrid full bridge circuit is given, and the work of the hybrid full bridge circuit under the PWM control strategy is analyzed. The influence of non-ideal factors such as the asymmetry of the filter inductance and the non-synchronization of the switch action on the model property of the circuit is discussed, and the model of the model is also given. The circuit characteristics of the hybrid full bridge circuit structure and other symmetrical inductance configuration circuits are compared, and the industry of the hybrid full bridge circuit is emphasized. The experiment test platform of 3kW is set up, and the hybrid full bridge structure is verified. In this paper, the influence of the parasitic parameters and the difference of the parameters on the leakage current in the non-transformer type inverter circuit based on the symmetric inductance structure is analyzed. In this paper, the model of the common mode resonant circuit related to the parasitic parameters of the system is given, and the disturbance of the high-frequency co-mode voltage and the parasitic parameters of the circuit are obtained. Based on the above-mentioned analysis, the common mode voltage and position structure of the high-frequency co-mode leakage current of the system is further eliminated, and the structure is optimized by using the existing full-bridge type symmetrical inductance configuration circuit, so that the common mode voltage in the existing topological scheme is effectively reduced, the high-frequency disturbance of the system is reduced, the parasitic parameter of the circuit is reduced, the system co-mode leakage is reduced, The effect of the current is verified by using the HERIC circuit based on the active voltage and the level of the active voltage. In this paper, an asymmetric inductor-based configuration with a flying-span capacitor junction is proposed. The circuit is formed by combining a three-level Buck structure of a flying capacitor and a power-frequency phase-changing structure, not only inherits the advantages of high conversion efficiency of the multi-level circuit and small filter inductance, but also retains the high-frequency co-mode leakage in the circuit of the power frequency switching structure the power of the current is reduced, the electricity is reduced, The DC input voltage of the circuit is based on the analysis of the working mode of the circuit. The design method of the parameters in the circuit is given from the angle of the conversion efficiency and the power density of the optimized circuit. Finally, using the above theory, combined with the network standard and the safety specification, the single-phase non-isolated photovoltaic grid-connected inverter product with high reliability and high conversion efficiency is designed, and the product has been proved by practice. The evaluation of the third-party organization has basically reached the work level.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM615;TM464
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