【摘要】：電力系統(tǒng)是國(guó)民經(jīng)濟(jì)和社會(huì)發(fā)展的關(guān)鍵，隨著社會(huì)的不斷發(fā)展和經(jīng)濟(jì)技術(shù)的不斷進(jìn)步，工業(yè)和生活用電需求量不斷增大，，人們對(duì)電能質(zhì)量要求越來越高。目前我國(guó)電網(wǎng)已經(jīng)形成大電網(wǎng)格局，隨著特高壓交直流技術(shù)的開展，對(duì)現(xiàn)有電力系統(tǒng)規(guī)劃提出了新的挑戰(zhàn)。 在這種背景下，本文采用大電網(wǎng)建設(shè)時(shí)序進(jìn)行電力系統(tǒng)規(guī)劃。大電網(wǎng)建設(shè)時(shí)序與常規(guī)電力系統(tǒng)規(guī)劃側(cè)重點(diǎn)有所不同，提出了大電網(wǎng)建設(shè)時(shí)序綜合評(píng)估指標(biāo)體系。將首先介紹提出綜合評(píng)估指標(biāo)體系的意義和思路，并著重研究綜合評(píng)估指標(biāo)體系的暫態(tài)安全穩(wěn)定指標(biāo)。大電網(wǎng)建設(shè)時(shí)序暫態(tài)安全穩(wěn)定評(píng)估包括優(yōu)化過程中和后校驗(yàn)評(píng)估，優(yōu)化過程中暫態(tài)安全穩(wěn)定評(píng)估要求計(jì)算量小，因此本文采用結(jié)構(gòu)均衡性作為優(yōu)化過程中暫態(tài)安全穩(wěn)定指標(biāo)；后校驗(yàn)評(píng)估指標(biāo)要求能全面衡量電力系統(tǒng)暫態(tài)穩(wěn)定性，因此本文采用臨界切除時(shí)間及短路比指標(biāo)進(jìn)行評(píng)估。 電網(wǎng)結(jié)構(gòu)越均衡，發(fā)生故障后的潮流轉(zhuǎn)移就越小，電網(wǎng)就更容易恢復(fù)到穩(wěn)定狀態(tài)。因此電網(wǎng)結(jié)構(gòu)均衡性指標(biāo)能在一定程度上衡量電力系統(tǒng)暫態(tài)穩(wěn)定。本文對(duì)電力系統(tǒng)電氣介數(shù)計(jì)算模型進(jìn)行改進(jìn)，提出電氣距離權(quán)重的電氣介數(shù)模型。然后引入熵作為電網(wǎng)結(jié)構(gòu)均衡性指標(biāo)，衡量電網(wǎng)結(jié)構(gòu)指標(biāo)分布的均衡程度。在此基礎(chǔ)上采用小系統(tǒng)算例進(jìn)行電網(wǎng)建設(shè)時(shí)序結(jié)構(gòu)均衡性評(píng)估，并針對(duì)建設(shè)時(shí)序方案進(jìn)行后校驗(yàn)。根據(jù)小算例測(cè)試系統(tǒng)后校驗(yàn)指標(biāo)可以得到基于結(jié)構(gòu)均衡性的電網(wǎng)建設(shè)時(shí)序優(yōu)化過程中暫態(tài)穩(wěn)定性指標(biāo)能有效衡量時(shí)序安全穩(wěn)定性。 本文還針對(duì)大電網(wǎng)建設(shè)時(shí)序進(jìn)行安全穩(wěn)定約束條件研究，為大電網(wǎng)建設(shè)時(shí)序優(yōu)化提供參考。
[Abstract]:Power system is the key to the development of national economy and society. With the development of society and the progress of economy and technology, the demand for electricity in industry and daily life is increasing, and the demand for power quality is becoming higher and higher. With the development of UHV AC / DC technology, the current power system planning has been challenged. Under this background, this paper uses the time series of large power grid construction to carry out power system planning. The time sequence of large power grid construction is different from that of conventional power system planning, and a time series comprehensive evaluation index system for large power grid construction is put forward. The significance and thinking of the comprehensive evaluation index system are introduced firstly, and the transient security stability index of the comprehensive evaluation index system is studied emphatically. Time series transient security stability assessment of large power network includes optimization process and post-check evaluation. The calculation of transient security stability evaluation in optimization process requires less calculation. Therefore, the structural equalization is used as the transient security stability index in the optimization process. The post-check evaluation index is required to measure the transient stability of power system comprehensively, so the critical excision time and short-circuit ratio index are used to evaluate the stability of power system. The more balanced the power grid structure is, the smaller the power flow transfer will be, and the easier it will be to restore the power grid to a stable state. Therefore, the power system equilibrium index can measure the transient stability of power system to a certain extent. In this paper, the electrical medium calculation model of power system is improved, and the electrical medium model of electrical distance weight is proposed. Then entropy is introduced as the equilibrium index of power network structure to measure the equilibrium degree of the distribution of power grid structure index. On the basis of this, a small system example is used to evaluate the equalization of the time series structure of power network construction, and a post check for the construction timing scheme is carried out. According to the post-check index of the test system based on small calculation example, the transient stability index in the process of power grid construction timing optimization based on structural equilibrium can effectively measure the time series security stability. This paper also studies the security and stability constraints for the construction timing of large power grid, which provides a reference for the optimization of the construction time sequence of large power grid.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM712

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本文編號(hào)：2399818