發(fā)布時(shí)間：2018-10-20 13:29

【摘要】：論文以我國(guó)某省實(shí)際電網(wǎng)為研究背景,旨在提高該省網(wǎng)的動(dòng)態(tài)穩(wěn)定性和運(yùn)行安全性,抑制系統(tǒng)低頻振蕩的發(fā)生。論文主要從兩個(gè)方向進(jìn)行了研究。首先,在FACTS設(shè)備上附加阻尼控制器。由于該省電網(wǎng)新加裝了一臺(tái)UPFC,UPFC具有強(qiáng)大的潮流和電壓等控制功能,控制通道數(shù)較多,因此可在其控制通道上附加阻尼控制器,向系統(tǒng)提供阻尼。本論文在MATLAB軟件環(huán)境下,獨(dú)立編寫(xiě)了一套適用于多機(jī)系統(tǒng)中UPFC阻尼轉(zhuǎn)矩分析的程序,利用阻尼轉(zhuǎn)矩分析方法研究了阻尼控制器附加在UPFC不同控制通道上時(shí)向目標(biāo)模式提供阻尼的情況,包括阻尼在各臺(tái)機(jī)組之間傳遞分配的過(guò)程,各臺(tái)機(jī)組參與模式振蕩的程度。最后選出了阻尼控制器的最佳安裝通道,即控制交流電壓V的通道,并將結(jié)果與模式分析法進(jìn)行了對(duì)比驗(yàn)證,證明了其正確性。此外,論文通過(guò)在發(fā)電機(jī)組上加裝電力系統(tǒng)穩(wěn)定器來(lái)提高系統(tǒng)阻尼,并提出了設(shè)計(jì)穩(wěn)定器的一種新方法,即穩(wěn)定器的分布式設(shè)計(jì)方法。該方法以發(fā)電機(jī)出口升壓變壓器高壓側(cè)母線電壓角度為相位參考點(diǎn)建立本地模型,不需要求解計(jì)算發(fā)電廠以外的系統(tǒng)參數(shù),只要采集本地的信號(hào)即可,因此其設(shè)計(jì)簡(jiǎn)單方便,并適合在大規(guī)模電網(wǎng)中的應(yīng)用,本論文首先在MATLAB軟件環(huán)境下,以單機(jī)無(wú)窮大母線系統(tǒng)為例,利用分布式原理設(shè)計(jì)了電力系統(tǒng)穩(wěn)定器,并進(jìn)行了仿真驗(yàn)證,證明了該方法的有效性。隨后針對(duì)該省電網(wǎng)2016年夏季高峰運(yùn)行方式,在PSD-BPA電力系統(tǒng)分析軟件環(huán)境下,計(jì)算了網(wǎng)絡(luò)中存在的5個(gè)低頻振蕩模式,并用分布式設(shè)計(jì)方法設(shè)計(jì)了穩(wěn)定器。最后,在頻域內(nèi)對(duì)比了穩(wěn)定器加裝前后振蕩模式的阻尼比變化情況,同時(shí)在時(shí)域內(nèi)進(jìn)行了仿真,對(duì)比了穩(wěn)定器加裝前后系統(tǒng)振蕩的幅度。無(wú)論頻域還是時(shí)域內(nèi)的結(jié)果都表明了分布式方法設(shè)計(jì)的穩(wěn)定器提高了該省網(wǎng)的動(dòng)態(tài)穩(wěn)定性,適于在大規(guī)模電網(wǎng)中的應(yīng)用設(shè)計(jì)。
[Abstract]:The purpose of this paper is to improve the dynamic stability and operation security of the power grid in a province of China, and to restrain the occurrence of the low frequency oscillation of the system. This paper mainly studies from two directions. First, a damping controller is attached to the FACTS device. Because a new UPFC,UPFC has powerful control functions such as power flow and voltage and there are more control channels in the power grid of this province, damping controller can be added to the control channel to provide damping to the system. In this paper, an independent program for UPFC damping torque analysis in multi-machine systems is developed under the environment of MATLAB software. The damping torque analysis method is used to study the damping supply to the target mode when the damping controller is attached to different control channels of the UPFC, including the transfer and distribution of damping among the units, and the degree of participation of each unit in the mode oscillation. Finally, the optimal installation channel of the damping controller is selected, that is, the channel to control the AC voltage V, and the results are compared with the mode analysis method, and the correctness of the method is proved. In addition, the system damping is improved by installing power system stabilizer on the generator set, and a new method of designing stabilizer, I. E. the distributed design method of stabilizer, is proposed. This method takes the voltage angle of high-voltage bus of generator outlet booster transformer as the phase reference point to establish the local model. It does not need to solve the calculation of system parameters outside the power plant, so it can only collect local signals, so its design is simple and convenient. And it is suitable for application in large-scale power network. Firstly, in the environment of MATLAB software, the power system stabilizer is designed based on the distributed principle, and the simulation is carried out with the single machine infinite bus system as an example. The effectiveness of the method is proved. Then, in view of the peak operation mode of the provincial power grid in 2016 summer, five low frequency oscillation modes in the network are calculated under the environment of PSD-BPA power system analysis software, and the stabilizer is designed with the distributed design method. Finally, the damping ratio of the stabilizer before and after the addition of the stabilizer is compared in the frequency domain. At the same time, the simulation in time domain is carried out, and the amplitude of the oscillation before and after the installation of the stabilizer is compared. The results in both frequency domain and time domain show that the stabilizer designed by the distributed method improves the dynamic stability of the power network and is suitable for application in large-scale power systems.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM712

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本文編號(hào)：2283322