【摘要】：柔性直流輸電技術(shù)在風(fēng)電并網(wǎng)工程、可再生能源并網(wǎng)工程、孤島供電工程以及分布式發(fā)電并網(wǎng)工程等諸多領(lǐng)域得到了廣泛應(yīng)用,而主回路的參數(shù)以及控制系統(tǒng)的性能對整個系統(tǒng)的運(yùn)行行為有著極為重要的影響。因此,研究柔性直流輸電系統(tǒng)主回路參數(shù)與系統(tǒng)運(yùn)行行為的關(guān)系,并基于此對主回路參數(shù)進(jìn)行設(shè)計具有重要的現(xiàn)實(shí)意義。本文對柔性直流輸電系統(tǒng)建模、控制器設(shè)計、主回路中的參數(shù)與系統(tǒng)運(yùn)行行為的關(guān)系進(jìn)行了研究,主要包括以下幾個方面的內(nèi)容:分析了柔性直流輸電系統(tǒng)的運(yùn)行機(jī)理,建立其在abc靜止坐標(biāo)系下的數(shù)學(xué)模型,考慮到在abc坐標(biāo)下控制器設(shè)計的困難,建立了在dq旋轉(zhuǎn)坐標(biāo)下的數(shù)學(xué)模型。設(shè)計了基于直接電流控制的雙閉環(huán)控制器,從系統(tǒng)傳遞函數(shù)的角度出發(fā),采用極點(diǎn)配置的方法對內(nèi)環(huán)電流控制器、外環(huán)電壓控制器、外環(huán)功率控制器的PI參數(shù)進(jìn)行設(shè)計。為了提高系統(tǒng)抗擾動性能,引入負(fù)載電流前饋控制對外環(huán)電壓控制器進(jìn)行了改進(jìn)。研究了主回路參數(shù)與系統(tǒng)運(yùn)行行為的關(guān)系。針對電感與系統(tǒng)運(yùn)行行為的關(guān)系,分析了電感對電壓源換流器四象限運(yùn)行、快速電流跟蹤、諧波電流抑制、功率因數(shù)的影響,基于此給出了滿足這些性能指標(biāo)的電感取值范圍;針對電容與系統(tǒng)運(yùn)行行為的關(guān)系,分析了電容對電壓環(huán)跟隨特性以及直流電壓波動抑制的影響,并基于此給出了滿足這些性能指標(biāo)的電容取值范圍。最后,在PSCAD/EMTDC平臺搭建了一個柔性直流輸電系統(tǒng)仿真模型,采用雙閉環(huán)控制器,內(nèi)環(huán)采用電流控制器,外環(huán)一端采用定有功功率、定無功功率控制,另一端采用定直流電壓、定無功功率控制。根據(jù)文中給出的主回路電感和電容的設(shè)計方法,在搭建的仿真模型中對比分析了主回路參數(shù)變化時系統(tǒng)運(yùn)行行為指標(biāo)的變化。主回路參數(shù)選擇之后的仿真結(jié)果驗(yàn)證了參數(shù)選擇方法的正確性,所選擇的主回路參數(shù)能夠滿足電壓源換流器和控制器的正常運(yùn)行,為實(shí)際工程應(yīng)用打下了一定的基礎(chǔ)。
[Abstract]:Flexible direct current transmission technology has been widely used in wind power grid connection project, renewable energy grid connection project, island power supply project and distributed generation grid connection project, etc. The parameters of the main loop and the performance of the control system have an extremely important impact on the operation behavior of the whole system. Therefore, it is of great practical significance to study the relationship between the main loop parameters and the operation behavior of the flexible direct current transmission system, and to design the main circuit parameters based on this. In this paper, the modeling of flexible direct current transmission system, the design of controller, the relationship between the parameters in the main loop and the operation behavior of the system are studied. The main contents are as follows: the operation mechanism of the flexible direct current transmission system is analyzed. The mathematical model in abc stationary coordinate system is established. Considering the difficulty of controller design in abc coordinate, the mathematical model under dq rotation coordinate is established. A double closed loop controller based on direct current control is designed. From the point of view of system transfer function, the Pi parameters of inner loop current controller, outer loop voltage controller and outer loop power controller are designed by pole assignment method. In order to improve the anti-disturbance performance of the system, the load current feedforward control is introduced to improve the outer loop voltage controller. The relationship between the main loop parameters and the operation behavior of the system is studied. In view of the relationship between inductance and system operation behavior, the influence of inductor on the four-quadrant operation of voltage source converter, fast current tracking, harmonic current suppression and power factor is analyzed. Based on this, the range of inductance to meet these performance indexes is given. In view of the relationship between capacitance and system operation behavior, the influence of capacitance on the following characteristics of voltage loop and the suppression of DC voltage fluctuation is analyzed. Based on this, the range of capacitance values satisfying these performance indexes is given. Finally, a simulation model of the flexible DC transmission system is built on the PSCAD / EMTDC platform, which adopts a double closed loop controller, a current controller in the inner loop, a constant active power, a constant reactive power control at one end of the outer loop, and a constant DC voltage at the other end. Constant reactive power control. According to the design method of the inductance and capacitance of the main loop in this paper, the variation of the operating behavior index of the system when the parameters of the main loop are changed is compared and analyzed in the simulation model. The simulation results after selecting the main circuit parameters verify the correctness of the parameter selection method. The selected main circuit parameters can meet the normal operation of the voltage source converter and controller, which lays a certain foundation for the practical engineering application.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1

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