【摘要】：多電平逆變器已被廣泛應(yīng)用于大功率礦用提升機(jī)、風(fēng)機(jī)、壓縮機(jī)、傳送帶等場(chǎng)合，隨著工礦企業(yè)對(duì)電機(jī)驅(qū)動(dòng)設(shè)備高功率因數(shù)、低開關(guān)損耗、低諧波含量的要求不斷提高，各種多電平逆變器拓?fù)鋺?yīng)運(yùn)而生。有源中點(diǎn)鉗位型（ANPC）五電平逆變器因其具有無(wú)需移相變壓器和鉗位二極管，每相只有一個(gè)懸浮電容，直流母線只有一個(gè)中點(diǎn)電位等優(yōu)點(diǎn)，越來(lái)越受到學(xué)術(shù)界和工業(yè)界的關(guān)注。 在分析了ANPC五電平逆變器工作原理的基礎(chǔ)上，首先對(duì)ANPC五電平逆變器的SHEPWM技術(shù)進(jìn)行了深入研究。采用新穎的全局最優(yōu)粒子群優(yōu)化算法，通過(guò)調(diào)試種群大小、慣性權(quán)重、加速度系數(shù)等參數(shù)，高效搜索出了開關(guān)角非線性超越方程組的解，并針對(duì)不同的調(diào)制度范圍分別設(shè)計(jì)了不同的逆變器輸出相電壓波形。采用電壓滯環(huán)控制策略平衡懸浮電容電壓，并通過(guò)調(diào)節(jié)懸浮電容電壓滯環(huán)閾值大小，影響中點(diǎn)電位的自平衡能力，以實(shí)現(xiàn)對(duì)中點(diǎn)電位的平衡控制。仿真結(jié)果表明，該滯環(huán)控制策略需要針對(duì)不同的調(diào)制度調(diào)試出合適的閾值大小，在保證中點(diǎn)電位平衡的前提下盡量降低開關(guān)頻率，工程應(yīng)用中具有一定的局限性。 為此，，進(jìn)一步研究了ANPC五電平逆變器的SVPWM技術(shù)。首先引入物理意義明確的ja-jb-jc虛坐標(biāo)系，將逆變器輸出的零序、非零序電壓分量分開控制，簡(jiǎn)化了矢量序列的選擇過(guò)程和矢量作用時(shí)間的計(jì)算。然后分析了ANPC五電平逆變器在512個(gè)三相開關(guān)組合下形成的10種直流母線電容充放電回路，并分別建立了能夠形成各回路的所有空間電壓矢量表，進(jìn)而通過(guò)查表掌握125個(gè)空間電壓矢量對(duì)中點(diǎn)電位的影響特性。最后在此基礎(chǔ)上提出了基于SVPWM技術(shù)的中點(diǎn)電位平衡控制策略，并通過(guò)仿真在不同調(diào)制度下驗(yàn)證了該策略的有效性。 為進(jìn)一步驗(yàn)證ANPC五電平逆變器的調(diào)速特性，分析了永磁同步電機(jī)的矢量控制策略，搭建了基于isd=0控制策略的矢量控制系統(tǒng)仿真模型。仿真結(jié)果表明：在SVPWM技術(shù)調(diào)制下，永磁同步電機(jī)輸出轉(zhuǎn)矩脈動(dòng)小，動(dòng)態(tài)響應(yīng)速度快，本文提出的中點(diǎn)電位平衡控制策略能夠在動(dòng)態(tài)條件下有效平衡ANPC五電平逆變器的中點(diǎn)電位。 最后，介紹了實(shí)驗(yàn)樣機(jī)硬件平臺(tái)，著重給出了基于“DSP+雙FPGA”的數(shù)字控制系統(tǒng)設(shè)計(jì)方案；并設(shè)計(jì)了軟件程序，對(duì)本文研究的幾種調(diào)制策略進(jìn)行了實(shí)驗(yàn)驗(yàn)證。
[Abstract]:Multi-level inverter has been widely used in high-power mine hoist, fan, compressor, conveyor belt and so on, with the requirement of high power factor, low switching loss and low harmonic content of motor-driven equipment in industrial and mining enterprises, various multi-level inverter topologies have emerged. An active mid-point clamp type (ANPC) five-level inverter has the advantages of no need of phase-shifting transformer and clamping diode, only one floating capacitor for each phase, and only one midpoint potential of the DC bus, and is more and more concerned by the academic and industry. Based on the analysis of the working principle of the ANPC five-level inverter, the SHEPWM technology of the ANPC five-level inverter is studied. In this paper, a novel global optimal particle swarm optimization algorithm is used to efficiently search the solution of the nonlinear transcendental equations of the switching angle by adjusting the parameters such as the population size, the inertia weight, the acceleration coefficient and the like, and the different output phase voltage waves of the inverter are respectively designed for different modulation system ranges. The voltage hysteresis control strategy is adopted to balance the floating capacitor voltage, and the self-balancing capacity of the mid-point potential is affected by adjusting the voltage hysteresis threshold of the suspension capacitor, so as to realize the balance control on the midpoint potential. The simulation results show that the control strategy of the hysteresis loop needs to adjust the appropriate threshold size for different modulation systems, and reduce the switching frequency as much as possible under the premise of ensuring the balance of the mid-point potential. The SVPW of the ANPC five-level inverter is further studied for this purpose. the method comprises the following steps of: firstly, introducing a ja-jb-jc virtual coordinate system with a definite physical meaning, separating the zero sequence and the non-zero sequence voltage component output by the inverter, and simplifying the selection process and the vector action time of the vector sequence; The charge and discharge loop of 10 DC bus lines formed by the five-level inverter of ANPC at 512 three-phase switches is then analyzed, and all the space voltage vector tables of each circuit can be formed, and the shadow of the midpoint potential of the 125 space voltage vectors can be obtained by looking up the table. In this paper, the mid-point potential balance control strategy based on SVPWM technology is put forward, and the strategy is verified by simulation under different modulation systems. In order to further verify the speed regulation of the ANPC five-level inverter, the vector control strategy of the permanent magnet synchronous motor is analyzed, and the vector control system based on the isd = 0 control strategy is set up. The simulation results show that, under the modulation of SVPWM, the output torque of the permanent magnet synchronous motor is small and the dynamic response speed is fast. The neutral point potential balance control strategy proposed in this paper can balance the ANPC five-level inverter effectively under the dynamic condition. At last, the hardware platform of the experimental prototype is introduced, and the design scheme of the digital control system based on the "DSP + Dual FPGA" is given. The software program is also designed.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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本文編號(hào)：2456489