本文選題：“背靠背”結(jié)構(gòu) + PWM整流器�。� 參考：《中原工學(xué)院》2017年碩士論文

【摘要】：隨著現(xiàn)代科技的不斷進(jìn)步,某些電氣設(shè)備成為合格成品之前需要進(jìn)行必不可少的帶不同特性的負(fù)載測(cè)試以顯示其帶載后的特性是否達(dá)到要求。而針對(duì)于傳統(tǒng)的測(cè)試負(fù)載所存在的缺陷,本文所研究的電子負(fù)載是一種將電力電子技術(shù)和智能功率開關(guān)管以及DSP控制芯片相結(jié)合的電力電子裝置。利用PWM整流器可以實(shí)現(xiàn)四象限運(yùn)行的特性,將整流側(cè)靈活的控制在阻容性、阻感性和純阻性之間,實(shí)現(xiàn)實(shí)時(shí)、無級(jí)、大范圍的調(diào)整。對(duì)于節(jié)能方面的優(yōu)化,相比于傳統(tǒng)的測(cè)試負(fù)載而言,由于本次的研究設(shè)計(jì)采用的是AC-DC-AC的“背靠背”結(jié)構(gòu)。在電子負(fù)載的后端將直流側(cè)的電能通過逆變的方式回饋到電網(wǎng)側(cè),真正實(shí)現(xiàn)了能量的二次利用。同時(shí)大大降低了因電流的熱效應(yīng)而產(chǎn)生的發(fā)熱問題。本文首先從拓?fù)浣Y(jié)構(gòu)進(jìn)行了分析,從電壓型和電流型的對(duì)比中選擇了電壓型拓?fù)浣Y(jié)構(gòu)作為本文的研究對(duì)象。為了便于理解,將PWM整流器的模型進(jìn)行等效簡(jiǎn)化,結(jié)合向量法和Kirchhoff電壓定律對(duì)其四象限運(yùn)行的工作原理進(jìn)行分析驗(yàn)證。對(duì)于控制策略的選擇和應(yīng)用的前提條件是建立其數(shù)學(xué)模型和進(jìn)行前饋解耦算法所需要的有功、無功電流,有功、無功電壓等信息,而SPLL能夠正常鎖相和數(shù)學(xué)模型的建立以及前饋解耦算法所需要的信息得到的前提都是以坐標(biāo)變換作為支撐,所以坐標(biāo)變換作為第三章、第四章的邏輯起點(diǎn)在文中其推導(dǎo)過程做了較為詳細(xì)的分析。在第五章中對(duì)本次設(shè)計(jì)的硬件選取以及軟件設(shè)計(jì)的整體思想進(jìn)行介紹。在第六章中利用仿真平臺(tái)對(duì)整體的設(shè)計(jì)方案進(jìn)行了驗(yàn)證,在控制功率因數(shù)角的子系統(tǒng)中,提出了一種利用有功、無功電流幅值關(guān)系與三角函數(shù)關(guān)系相結(jié)合的方法,搭建的仿真能夠靈活、準(zhǔn)確的控制功率因數(shù)且諧波較小。通過運(yùn)行結(jié)果體現(xiàn)了整體設(shè)計(jì)的可行性。
[Abstract]:With the development of modern science and technology, some electrical equipment need to carry out load tests with different characteristics to show whether the characteristics after loading meet the requirements before becoming a qualified finished product. Aiming at the defects of the traditional test load, the electronic load studied in this paper is a kind of power electronic device which combines power electronics technology with intelligent power switch and DSP control chip. The PWM rectifier can be used to realize the four-quadrant operation, and the rectifier side can be flexibly controlled between resistive and capacitive, inductive and pure resistive to realize real-time, stepless and wide range adjustment. For the optimization of energy saving, compared with the traditional test load, the AC-DC-AC "back to back" structure is adopted in this research design. At the back end of the electronic load, the DC side energy is fed back to the power grid side by the way of inverter, and the secondary utilization of energy is realized. At the same time, the heat problem caused by the thermal effect of current is greatly reduced. In this paper, the topology structure is analyzed firstly, and the voltage type topology is chosen as the object of this paper from the comparison of voltage and current modes. In order to be easy to understand, the PWM rectifier model is simplified and the working principle of the four-quadrant operation is analyzed and verified by using vector method and Kirchhoff's voltage law. The precondition of selecting and applying control strategy is to establish the mathematical model and the information of active power, reactive current, active power, reactive power and voltage needed for the feedforward decoupling algorithm. The SPLL can establish the normal phase-locked mathematical model and the information needed by the feedforward decoupling algorithm is based on coordinate transformation as the support, so coordinate transformation as the third chapter, The logical starting point of chapter 4 is analyzed in detail in this paper. In the fifth chapter, the hardware selection and the whole idea of software design are introduced. In the sixth chapter, the simulation platform is used to verify the whole design scheme. In the subsystem of controlling the power factor angle, a method of combining the active power, reactive current amplitude relationship and trigonometric function relationship is proposed. The simulation can be flexible, accurate control of power factor and less harmonic. The feasibility of the whole design is reflected by the running results.
【學(xué)位授予單位】：中原工學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM461

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