本文選題：區(qū)域電網(wǎng)　切入點：獨立運行　出處：《華北電力大學(北京)》2016年碩士論文

【摘要】：大電網(wǎng)發(fā)生嚴重故障造成區(qū)域電網(wǎng)與主網(wǎng)解列形成孤立電網(wǎng),另一方面由于歷史和經(jīng)濟等原因,我國仍然存在區(qū)域電網(wǎng)獨立運行的情況。該類電網(wǎng)屬于典型的“大機組、大負荷、小網(wǎng)”,單機占比重、負荷占比大,頻率穩(wěn)定問題是電網(wǎng)安全穩(wěn)定最突出的難題。因此,研究孤立電網(wǎng)的頻率動態(tài)特性及穩(wěn)定控制策略,對保證孤網(wǎng)的穩(wěn)定、安全運行具有重要意義。本文理論推導(dǎo)了不帶和帶有調(diào)頻限幅的一次調(diào)頻動態(tài)過程的數(shù)學表達式,進而得到最大頻率偏差、最大頻率變化率、靜態(tài)頻率偏差的數(shù)學表達式,分析了調(diào)速器靜態(tài)調(diào)差系數(shù)、一次調(diào)頻機組比例、發(fā)電機慣性時間常數(shù)、調(diào)速器時間常數(shù)等對一次調(diào)頻的影響,分析了二次調(diào)頻對區(qū)域電網(wǎng)頻率動態(tài)過程的影響,提出了增加微分環(huán)節(jié)的二次調(diào)頻優(yōu)化方法。以具體的電解鋁區(qū)域電網(wǎng)為例,針對孤網(wǎng)中電解鋁的陽極效應(yīng)問題,提出了增加加速度前饋環(huán)節(jié)的一次調(diào)頻優(yōu)化方法；針對企業(yè)與外網(wǎng)解列機組甩負荷情況,提出了自動修改負荷定值的方法。接下來,本文探討了電解鋁區(qū)域電網(wǎng)的穩(wěn)定控制原則,提出了把故障后系統(tǒng)功率不平衡量控制在區(qū)域電網(wǎng)一次調(diào)頻能力范圍內(nèi)的穩(wěn)定控制策略,并考慮一定的裕度。提出了區(qū)域電網(wǎng)一次調(diào)頻能力的計算方法,進而得出可切負荷量或發(fā)電量的范圍。針對晶閘管整流機組的特點,提出了壓負荷的控制策略。最后,本文在電力系統(tǒng)綜合仿真程序(PSASP7.0)中建立了某電解鋁區(qū)域電網(wǎng)模型,驗證所提方法的正確性和有效性。
[Abstract]:The serious failure of large power grid results in the isolation of the regional power network from the main network. On the other hand, due to historical and economic reasons, there still exists the independent operation of the regional power network in China.This kind of power network belongs to the typical "large unit, large load, small network", the single machine occupies the proportion, the load occupies the large proportion, the frequency stability problem is the most prominent difficult problem of the power network security and stability.Therefore, it is of great significance to study the frequency dynamic characteristics and stability control strategy of isolated power network to ensure the stability and safe operation of the isolated network.In this paper, the mathematical expressions of the dynamic process of primary frequency modulation without and with frequency modulation limiting are derived theoretically, and then the mathematical expressions of the maximum frequency deviation, the maximum frequency change rate and the static frequency deviation are obtained, and the static adjustment coefficient of the governor is analyzed.The influence of the ratio of primary frequency modulation unit, the inertia time constant of generator and the time constant of governor on primary frequency modulation is analyzed. The influence of secondary frequency modulation on the frequency dynamic process of regional power network is analyzed, and the optimization method of secondary frequency modulation with increasing differential link is put forward.Taking the specific electrolytic aluminum regional power network as an example, aiming at the anode effect of electrolytic aluminum in the isolated network, the paper puts forward a method of optimizing the primary frequency modulation to increase the acceleration feedforward link, and aiming at the load rejection of the unlined units in the enterprise and the outer network,A method for automatic modification of load setting is proposed.Then, this paper discusses the stability control principle of electrolytic aluminum regional power network, and puts forward a stable control strategy to control the system power imbalance after failure within the primary frequency modulation capability of the regional power network, and considers a certain margin.The calculation method of primary frequency modulation capacity of regional power network is presented, and the range of load shedding or power generation is obtained.According to the characteristics of thyristor rectifier unit, the control strategy of voltage load is put forward.Finally, in the power system comprehensive simulation program PSASP7.0), a regional power network model of electrolytic aluminum is established to verify the correctness and effectiveness of the proposed method.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM712

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本文編號：1712815