【摘要】：隨著電力系統(tǒng)的發(fā)展,新型電力系統(tǒng)元件如模塊化多電平換流器等的不斷出現(xiàn)以及西電東送的步伐加快,使得交流電網(wǎng)的送電距離越來越遠(yuǎn),交直流混合運(yùn)行的電網(wǎng)結(jié)構(gòu)日趨復(fù)雜和龐大,而對電網(wǎng)運(yùn)行安全性的要求也在逐步提高,數(shù)字仿真是研究復(fù)雜電力系統(tǒng)的一種經(jīng)濟(jì)便捷的有效方式,也是電力系統(tǒng)運(yùn)行安全、控制策略評估的一個(gè)不可或缺的環(huán)節(jié)。本文以魯西背靠背直流工程中將兩種不同類型的換流單元放置于同一個(gè)換流站中為背景,在實(shí)時(shí)數(shù)字仿真器(Real Time Digital Simulator,簡稱RTDS)的仿真環(huán)境中,對同時(shí)包含柔性直流單元與常規(guī)直流單元這兩種不同單元的混合式背靠背換流站的主結(jié)構(gòu)進(jìn)行建模,并通過RTDS的CBuilder功能將工程中實(shí)際的控制程序轉(zhuǎn)化為仿真模型中的自定義控制元件,從而實(shí)現(xiàn)了一個(gè)可以脫離外部控制裝置獨(dú)立運(yùn)行的全數(shù)字化閉環(huán)實(shí)驗(yàn)系統(tǒng)。全數(shù)字形式的仿真模型因?yàn)椴恍枰獠靠乇Ｑb置所以其具有硬件成本較低、實(shí)驗(yàn)系統(tǒng)搭建方便的優(yōu)點(diǎn),使用CBuilder功能進(jìn)行自定義元件也能有效的減少仿真計(jì)算資源的占用,方便控制邏輯在不同的仿真環(huán)境中進(jìn)行移植。為了驗(yàn)證本文開發(fā)的自定義控制元件的有效性,使用該全數(shù)字仿真模型進(jìn)行了數(shù)項(xiàng)實(shí)驗(yàn),并將實(shí)驗(yàn)波形分別與帶實(shí)際控制保護(hù)裝置的閉環(huán)實(shí)驗(yàn)系統(tǒng)和現(xiàn)場運(yùn)行獲得的波形進(jìn)行對比。結(jié)果表明,本文開發(fā)的控制元件與實(shí)際的裝置擁有相同的控制效果,適用于控制效果、故障特性與保護(hù)策略等方面的仿真及研究。
[Abstract]:With the development of power system, the emerging of new power system components such as modularized multilevel converters, and the acceleration of power transmission from west to east, make the power transmission distance of AC power grid more and more distant. The power network structure of AC / DC hybrid operation is becoming more and more complex and huge, and the requirement of power network operation security is also gradually raised. Digital simulation is an economical, convenient and effective way to study complex power system, and it is also the power system operation safety. The evaluation of control strategy is an indispensable part. In this paper, two different types of converter units are placed in the same converter station in Luxi back-to-back DC engineering, and in the simulation environment of real-time digital simulator (Real Time Digital Simulator, (RTDS). The main structure of a hybrid back-to-back converter station with two different elements, flexible DC unit and conventional DC unit, is modeled. Through the CBuilder function of RTDS, the actual control program in engineering is transformed into a self-defined control element in the simulation model, and a fully digital closed-loop experimental system which can run independently from the external control device is realized. The full-digital simulation model has the advantages of low hardware cost and convenient construction of the experimental system because it does not need external control and protection devices. The use of CBuilder function for custom components can also effectively reduce the use of simulation computing resources. Convenient control logic is transplanted in different simulation environments. In order to verify the validity of the self-defined control element developed in this paper, several experiments are carried out using the full-digital simulation model. The experimental waveform is compared with the closed loop experimental system with actual control protection device and the waveform obtained from field operation. The results show that the control element developed in this paper has the same control effect as the actual device, which is suitable for the simulation and research of control effect, fault characteristics and protection strategy.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1

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本文編號：2320793