基于下垂控制的三電平逆變器并脫網(wǎng)平滑切換研究
本文選題:分布式發(fā)電 切入點(diǎn):雙模式運(yùn)行 出處:《燕山大學(xué)》2014年碩士論文
【摘要】:隨著環(huán)境和能源問(wèn)題的日益嚴(yán)重,,人們?cè)絹?lái)越重視可再生能源的開(kāi)發(fā)與利用。分布式發(fā)電技術(shù)的優(yōu)勢(shì)在于可以充分利用各種分散存在的可再生能源,現(xiàn)已成為新能源應(yīng)用的主要手段。大電網(wǎng)與分布式發(fā)電系統(tǒng)相結(jié)合是降低投資,減少能耗,提升系統(tǒng)供電可靠性、靈活性的主要方法,是未來(lái)的主要研究方向。分布式發(fā)電系統(tǒng)在孤島運(yùn)行模式與并網(wǎng)運(yùn)行模式之間的無(wú)縫切換是實(shí)現(xiàn)大電網(wǎng)與分布式發(fā)電系統(tǒng)相結(jié)合的研究重點(diǎn),也正是本文的研究?jī)?nèi)容。 本文首先分析了二極管箝位三電平逆變器的工作原理和調(diào)制方法,針對(duì)傳統(tǒng)空間矢量調(diào)制扇區(qū)判斷復(fù)雜、三角函數(shù)運(yùn)算多等問(wèn)題提出了一種改進(jìn)的空間矢量調(diào)制算法。該算法可以實(shí)現(xiàn)一步判斷出目標(biāo)矢量所在扇區(qū),且無(wú)三角函數(shù)運(yùn)算,更適用于FPGA控制,節(jié)省大量資源與時(shí)間。本文接著研究了適用于下垂控制的主動(dòng)同步算法,在分析前人研究成果的基礎(chǔ)上,簡(jiǎn)化了主動(dòng)同步控制器的結(jié)構(gòu),使得控制更簡(jiǎn)單有效。然后針對(duì)使用傳統(tǒng)下垂控制的逆變器在并網(wǎng)切換時(shí)會(huì)產(chǎn)生有功沖擊,在并網(wǎng)穩(wěn)定運(yùn)行時(shí)存在無(wú)功交換的問(wèn)題,提出了一種改進(jìn)下垂控制方法。該方法消除了有功沖擊和無(wú)功交換,實(shí)現(xiàn)了兩種模式間的無(wú)縫切換。 最后對(duì)本文提出的改進(jìn)進(jìn)行了仿真驗(yàn)證,并搭建了二極管箝位三電平逆變并網(wǎng)平臺(tái),采用DSP和FPGA組成主控電路,編寫(xiě)了完整的控制程序,通過(guò)實(shí)驗(yàn)證明了本文提出的控制方法的正確性。
[Abstract]:With the increasingly serious environmental and energy problems, people pay more and more attention to the development and utilization of renewable energy. The advantage of distributed power generation technology is that it can make full use of a variety of distributed renewable energy sources. The combination of large power grid and distributed generation system is the main way to reduce investment, reduce energy consumption, improve the reliability and flexibility of power supply. The seamless switching of distributed generation system between island operation mode and grid-connected operation mode is the focus of research on the combination of large power grid and distributed generation system, which is also the research content of this paper. In this paper, the working principle and modulation method of diode clamped three-level inverter are analyzed. In this paper, an improved space vector modulation algorithm is proposed for many trigonometric function operations. This algorithm can be used to determine the sector of the target vector in one step, and has no trigonometric function operation, so it is more suitable for FPGA control. This paper then studies the active synchronization algorithm suitable for droop control, and simplifies the structure of active synchronization controller based on the analysis of previous research results. It makes the control simpler and more effective. Then, the inverter with traditional droop control will produce active power impact when switching grid-connected, and there is the problem of reactive power exchange in the stable operation of grid-connected. An improved droop control method is proposed, which eliminates active power shock and reactive power exchange, and realizes seamless switching between the two modes. Finally, the improvement is simulated and verified, and a diode clamped three-level inverter grid-connected platform is built. The main control circuit is composed of DSP and FPGA, and a complete control program is written. The experimental results show that the proposed control method is correct.
【學(xué)位授予單位】:燕山大學(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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