本文選題：次同步諧振 + 測試信號法�。� 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：由于能源結(jié)構(gòu)調(diào)整的現(xiàn)實(shí)需求和我國能源“西產(chǎn)東用”的實(shí)際情況,必須發(fā)展“西電東送”和大電網(wǎng)互聯(lián)系統(tǒng)。串補(bǔ)裝置在遠(yuǎn)距離和大容量傳輸線路中的應(yīng)用,有效的減少了線路的等效電抗便一定程度提高了電力系統(tǒng)的靜穩(wěn)極限和潮流傳輸能力。但伴隨串聯(lián)補(bǔ)償設(shè)備的應(yīng)用而引起的次同步諧振(Sub-synchronous Resonance;SSR)問題也日益凸顯,尤其是其對發(fā)電機(jī)組的軸系損傷而大大的降低電力系統(tǒng)的穩(wěn)定性,并對發(fā)電機(jī)組存在潛在危機(jī)。可見細(xì)致的研究次同步諧振的相關(guān)機(jī)理、分析測試方法、相關(guān)的阻尼控制措施以及工程應(yīng)用實(shí)例,對于維持系統(tǒng)穩(wěn)定以及抑制次同步諧振具有極高的應(yīng)用價(jià)值�；谌绱税l(fā)展前景,本文對次同步問題進(jìn)行分析,分類測試方法、提出抑制策略并結(jié)合工程進(jìn)行研究,主要內(nèi)容如下:(1)分析了測試信號法相關(guān)原理及該法的實(shí)現(xiàn)方案。首先分析電力系統(tǒng)的電氣阻尼和機(jī)械阻尼的計(jì)算方法,進(jìn)而分析其與系統(tǒng)次同步諧振的關(guān)系,利用此關(guān)聯(lián)判斷系統(tǒng)的穩(wěn)定性;其次基于測試模型驗(yàn)證測試信號方法的有效性,即將該法的分析結(jié)果與時(shí)域仿真結(jié)果對比分析;最后基于無窮大系統(tǒng)的標(biāo)準(zhǔn)模型進(jìn)行運(yùn)行工況的分析驗(yàn)證,給出了一套適用于電力系統(tǒng)的次同步諧振分析的測試信號法應(yīng)用方案。(2)提出了使用統(tǒng)一潮流控制器(Unified Power Flow Controller;UPFC)來解決系統(tǒng)的次同步諧振問題,并提出適用于工程的阻尼控制器設(shè)計(jì)方法。基于UPFC的運(yùn)行原理,通過對UPFC的主要控制措施附加阻尼控制,來達(dá)到抑制次同步諧振目的來設(shè)計(jì)阻尼控制器。通過數(shù)學(xué)仿真模型和仿真結(jié)果可以發(fā)現(xiàn),僅通過統(tǒng)一潮流控制器和固定的電容串聯(lián)補(bǔ)償并無法保證系統(tǒng)整體阻尼為正,則系統(tǒng)存在發(fā)生次同步諧振的風(fēng)險(xiǎn)。在此類分析的基礎(chǔ)上對于主要控制附加UPFC阻尼控制,此時(shí)可提高系統(tǒng)阻尼,進(jìn)而基于此設(shè)計(jì)阻尼控制器、結(jié)合算法給出參數(shù)的確定方案,最終結(jié)合模型加以驗(yàn)證分析。(3)研究了工程上利用其現(xiàn)場數(shù)據(jù)進(jìn)行分析、裝備相關(guān)阻尼控制器來提高系統(tǒng)阻尼,最終解決次同步諧振的問題。分析南京實(shí)際工程的運(yùn)行環(huán)境及次同步諧振風(fēng)險(xiǎn)的現(xiàn)狀,裝備含UPFC的阻尼控制后,結(jié)合試驗(yàn)數(shù)據(jù)分析其對SSR的抑制效果。首先從硬件設(shè)備上分析次同步諧振的抑制效果,進(jìn)而結(jié)合工程的實(shí)測數(shù)據(jù)和圖形進(jìn)行分析。目標(biāo)是結(jié)合工程實(shí)際分析次同步的產(chǎn)生和抑制方案,提高阻尼并抑制系統(tǒng)次同步諧振。論文最終基于南京系統(tǒng)模型和實(shí)際工程數(shù)據(jù)分析了結(jié)合工程提高系統(tǒng)阻尼,抑制次同步諧振問題的可行性。
[Abstract]:Due to the actual demand of energy structure adjustment and the actual situation of "producing energy from west to east" in our country, it is necessary to develop "power transmission from west to east" and interconnection system of large power grid. The application of series compensator in long distance and large capacity transmission lines effectively reduces the equivalent reactance of the line and improves the static stability limit and power flow transmission ability of the power system to a certain extent. However, the sub-synchronous Resonance system (SSRs) problem caused by the application of series compensation equipment is becoming increasingly prominent, especially its damage to the shafting of the generator sets greatly reduces the stability of the power system, and there is a potential crisis to the generator sets. It can be seen that the detailed study of the mechanism of sub-synchronous resonance, the analysis of testing methods, the relevant damping control measures and engineering application examples have a high application value for maintaining the stability of the system and suppressing the sub-synchronous resonance. Based on this prospect, this paper analyzes the sub-synchronization problem, classifies the test methods, puts forward the suppression strategy and studies it in combination with engineering. The main contents are as follows: 1) the related principle of the test signal method and its implementation scheme are analyzed. First, the calculation method of electrical damping and mechanical damping of power system is analyzed, then the relation between the damping and the sub-synchronous resonance of the system is analyzed, and the stability of the system is judged by this correlation. Secondly, the validity of the test signal method is verified based on the test model. The results of this method are compared with the results of time domain simulation. Finally, based on the standard model of infinite bus system, the operating conditions are analyzed and verified. In this paper, a set of test signal method application scheme for subsynchronous resonance analysis of power system is presented. A unified power flow controller, Unified Power Flow Controller (UPFC), is proposed to solve the sub-synchronous resonance problem of the system. The design method of damping controller suitable for engineering is put forward. Based on the operation principle of UPFC, the damping controller is designed by adding damping control to the main control measures of UPFC. Through the mathematical simulation model and simulation results, it can be found that only through unified power flow controller and fixed capacitor series compensation and can not guarantee the overall damping of the system is positive, then the system has the risk of sub-synchronous resonance. On the basis of this kind of analysis, the damping of the system can be improved by adding UPFC damping control to the main control, and then the damping controller is designed based on this, and the parameter determination scheme is given in combination with the algorithm. Finally, the model is used to verify and analyze the system. Finally, the problem of sub-synchronous resonance is solved by using the field data to analyze the system, and the related damping controller is equipped to improve the damping of the system. This paper analyzes the running environment of Nanjing actual project and the present situation of the risk of sub-synchronous resonance. After equipped with damping control with UPFC, the restraining effect of SSR is analyzed by combining the test data. First, the suppression effect of subsynchronous resonance is analyzed from the hardware equipment, and then the measured data and graph of the project are analyzed. The aim of this paper is to analyze the generation and suppression scheme of subsynchronization based on engineering practice, to increase the damping and to suppress the sub-synchronous resonance of the system. Finally, based on Nanjing system model and practical engineering data, the feasibility of increasing system damping and suppressing sub-synchronous resonance is analyzed.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712

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