基于變開關(guān)頻率的IGBT功率模塊結(jié)溫控制
發(fā)布時間：2018-12-24 11:12
【摘要】：由于風(fēng)電變流器運(yùn)行工況越來越復(fù)雜,使得對風(fēng)電系統(tǒng)可靠性要求也越來越高。功率器件結(jié)溫的波動是引起器件故障的主要因素,而器件結(jié)溫的波動是隨著風(fēng)機(jī)輸出功率變化而變化。因此,跟隨風(fēng)機(jī)輸出功率的變化,實(shí)時的調(diào)節(jié)器件結(jié)溫顯得十分有必要。目前,主要的結(jié)溫控制方式包括:以外部散熱或冷卻的方式來調(diào)節(jié)功率器件結(jié)溫的外部結(jié)溫控制和以控制功率器件損耗為基礎(chǔ)的內(nèi)部結(jié)溫控制。前者主要是調(diào)節(jié)器件的平均結(jié)溫,對器件結(jié)溫的波動情況調(diào)節(jié)效果較差。由于開關(guān)頻率對功率器件的損耗影響較大,因此本文采用變開關(guān)頻率的內(nèi)部結(jié)溫控制方式,來實(shí)現(xiàn)風(fēng)機(jī)中功率器件結(jié)溫的調(diào)節(jié)來開展研究工作。為分析開關(guān)頻率對IGBT功率模塊損耗和結(jié)溫的影響情況,本文首先對三相并網(wǎng)逆變器IGBT功率模塊損耗進(jìn)行了分析。針對傳統(tǒng)的三相逆變器功率器件損耗模型局限于SPWM調(diào)制策略、對器件結(jié)溫對損耗影響的分析不足等問題,本文推導(dǎo)了SVPWM調(diào)制下的三相并網(wǎng)逆變器功率器件損耗計算公式,該公式中引入了結(jié)溫反饋量,并根據(jù)功率器件用戶使用參數(shù),采用曲線擬合的方式對IGBT功率器件損耗進(jìn)行計算,并分析了開關(guān)頻率對IGBT功率模塊損耗的影響,為變開關(guān)頻率調(diào)節(jié)結(jié)溫提供了理論依據(jù)。其次,由于開關(guān)頻率是影響IGBT功率模塊損耗的重要因素,為實(shí)現(xiàn)IGBT功率模塊結(jié)溫的有效控制,本文提出了一種實(shí)時變開關(guān)頻率的IGBT功率模塊結(jié)溫控制方法,通過建立風(fēng)電變流器結(jié)溫預(yù)測模型提取變開關(guān)頻率結(jié)溫控制參數(shù),獲得了流過IGBT的電流、開關(guān)頻率、IGBT功率模塊結(jié)溫波動值的函數(shù)關(guān)系式,并通過仿真驗(yàn)證了運(yùn)用該函數(shù)關(guān)系式對IGBT功率模塊結(jié)溫進(jìn)行控制的可行性。然后,為在數(shù)字電路中實(shí)現(xiàn)三相并網(wǎng)逆變器變開關(guān)頻率控制,本文提出了一種基于FPGA的變開關(guān)頻率實(shí)現(xiàn)方法,該方法根據(jù)FPGA自上而下的設(shè)計思路以及并行運(yùn)行的特點(diǎn),將整個控制模塊劃分為多個子模塊,每個子模塊相對獨(dú)立并行運(yùn)行,通過VHDL語言編寫SVPWM算法模塊、Cordic算法模塊、三相鎖相環(huán)等子模塊的邏輯行為,并通過Modelsim軟件仿真驗(yàn)證模塊的算法邏輯,從而驗(yàn)證了SVPWM調(diào)制下三相逆變器變開關(guān)頻率的可行性。最后,搭建三相逆變器變開關(guān)結(jié)溫控制實(shí)驗(yàn)平臺,以DSP作為采樣部分,FPGA作為控制核心,實(shí)現(xiàn)輸出電流變化時,開關(guān)頻率的變化情況對比。從而驗(yàn)證了提出變開關(guān)頻率結(jié)溫控制方法的合理性以及可行性。
[Abstract]:Because of the more and more complex operating conditions of wind power converter, the reliability requirement of wind power system is becoming more and more high. The fluctuation of junction temperature of power device is the main factor that causes device fault, and the fluctuation of device junction temperature changes with the change of fan output power. Therefore, following the change of fan output power, it is necessary to adjust the device junction temperature in real time. At present, the main control methods of junction temperature include the external junction temperature control based on external heat dissipation or cooling and the internal junction temperature control based on the control of power device loss. The former mainly adjusts the average junction temperature of the device, and the effect on the fluctuation of the device junction temperature is poor. Because the switching frequency has a great influence on the loss of power devices, the internal junction temperature control mode with variable switching frequency is adopted in this paper to realize the adjustment of junction temperature of power devices in the fan to carry out the research work. In order to analyze the influence of switching frequency on the loss and junction temperature of IGBT power module, the loss of IGBT power module of three-phase grid-connected inverter is analyzed in this paper. Aiming at the problem that the traditional power device loss model of three-phase inverter is limited to SPWM modulation strategy, and the influence of device junction temperature on loss is insufficient, this paper deduces the formula for calculating power device loss of three-phase grid-connected inverter under SVPWM modulation. According to the user parameters of power devices, the loss of IGBT power devices is calculated by curve fitting, and the influence of switching frequency on the loss of IGBT power modules is analyzed. It provides a theoretical basis for changing switching frequency to adjust junction temperature. Secondly, because switching frequency is an important factor that affects the loss of IGBT power module, in order to realize the effective control of the junction temperature of IGBT power module, this paper presents a real-time switching frequency control method for IGBT power module junction temperature. Through the establishment of wind power converter junction temperature prediction model to extract the variable switching frequency junction temperature control parameters, obtained the current, switching frequency, IGBT power module junction temperature fluctuation value of the functional expression. The feasibility of using the function relation to control the junction temperature of IGBT power module is verified by simulation. Then, in order to realize the variable switching frequency control of three-phase grid-connected inverter in digital circuit, this paper presents a method of realizing variable switching frequency based on FPGA. The method is based on the top-down design idea of FPGA and the characteristics of parallel operation. The whole control module is divided into several sub-modules, each module running independently and in parallel. The logic behavior of SVPWM algorithm module, Cordic algorithm module and three-phase phase-locked loop sub-module are programmed by VHDL language. The algorithm logic of the module is verified by Modelsim software simulation, which verifies the feasibility of variable switching frequency of three-phase inverter under SVPWM modulation. Finally, a three-phase inverter variable switch junction temperature control experimental platform is built, with DSP as the sampling part and FPGA as the control core, the switching frequency changes are compared when the output current changes. The rationality and feasibility of the proposed method are verified.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN322.8;TM464
本文編號：2390548
[Abstract]:Because of the more and more complex operating conditions of wind power converter, the reliability requirement of wind power system is becoming more and more high. The fluctuation of junction temperature of power device is the main factor that causes device fault, and the fluctuation of device junction temperature changes with the change of fan output power. Therefore, following the change of fan output power, it is necessary to adjust the device junction temperature in real time. At present, the main control methods of junction temperature include the external junction temperature control based on external heat dissipation or cooling and the internal junction temperature control based on the control of power device loss. The former mainly adjusts the average junction temperature of the device, and the effect on the fluctuation of the device junction temperature is poor. Because the switching frequency has a great influence on the loss of power devices, the internal junction temperature control mode with variable switching frequency is adopted in this paper to realize the adjustment of junction temperature of power devices in the fan to carry out the research work. In order to analyze the influence of switching frequency on the loss and junction temperature of IGBT power module, the loss of IGBT power module of three-phase grid-connected inverter is analyzed in this paper. Aiming at the problem that the traditional power device loss model of three-phase inverter is limited to SPWM modulation strategy, and the influence of device junction temperature on loss is insufficient, this paper deduces the formula for calculating power device loss of three-phase grid-connected inverter under SVPWM modulation. According to the user parameters of power devices, the loss of IGBT power devices is calculated by curve fitting, and the influence of switching frequency on the loss of IGBT power modules is analyzed. It provides a theoretical basis for changing switching frequency to adjust junction temperature. Secondly, because switching frequency is an important factor that affects the loss of IGBT power module, in order to realize the effective control of the junction temperature of IGBT power module, this paper presents a real-time switching frequency control method for IGBT power module junction temperature. Through the establishment of wind power converter junction temperature prediction model to extract the variable switching frequency junction temperature control parameters, obtained the current, switching frequency, IGBT power module junction temperature fluctuation value of the functional expression. The feasibility of using the function relation to control the junction temperature of IGBT power module is verified by simulation. Then, in order to realize the variable switching frequency control of three-phase grid-connected inverter in digital circuit, this paper presents a method of realizing variable switching frequency based on FPGA. The method is based on the top-down design idea of FPGA and the characteristics of parallel operation. The whole control module is divided into several sub-modules, each module running independently and in parallel. The logic behavior of SVPWM algorithm module, Cordic algorithm module and three-phase phase-locked loop sub-module are programmed by VHDL language. The algorithm logic of the module is verified by Modelsim software simulation, which verifies the feasibility of variable switching frequency of three-phase inverter under SVPWM modulation. Finally, a three-phase inverter variable switch junction temperature control experimental platform is built, with DSP as the sampling part and FPGA as the control core, the switching frequency changes are compared when the output current changes. The rationality and feasibility of the proposed method are verified.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN322.8;TM464
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