【摘要】：與傳統(tǒng)的直流輸電不同，VSC-HVDC是一種以電壓源型換流器(VSC)、可關(guān)斷器件和脈寬調(diào)制(PWM)技術(shù)為基礎(chǔ)的新型柔性直流輸電技術(shù)。該技術(shù)采用基于脈寬調(diào)制技術(shù)的方法，能夠靈活獨(dú)立地控制有功功率和無功功率。換流站的整流器和逆變器具有良好的控制性能是VSC-HVDC系統(tǒng)安全穩(wěn)定運(yùn)行的保證，因此，VSC-HVDC換流器的控制成為核心問題備受關(guān)注。 首先，，從理論上介紹了VSC-HVDC系統(tǒng)的運(yùn)行原理，并建立了在αβ兩相靜止坐標(biāo)系下的暫態(tài)數(shù)學(xué)模型，分析了系統(tǒng)的功率交換控制原理，將與兩端交流系統(tǒng)間的功率控制問題，轉(zhuǎn)化為滿足運(yùn)行約束條件下電流有功分量和無功分量參考值的跟蹤問題。 其次，設(shè)計(jì)了內(nèi)環(huán)電流控制、外環(huán)功率控制的雙閉環(huán)控制器，實(shí)現(xiàn)了對(duì)有功功率和無功功率的解耦控制。本文內(nèi)環(huán)電流控制器引入了Terminal滑�？刂疲捎昧薞SC側(cè)與交流側(cè)復(fù)合功率控制方法，設(shè)計(jì)了αβ靜止坐標(biāo)下Terminal滑模內(nèi)環(huán)控制器，實(shí)現(xiàn)對(duì)有功功率和無功功率的獨(dú)立控制，提高了系統(tǒng)的抗擾動(dòng)能力，通過Lyapunov理論證明了該控制器作用下閉環(huán)系統(tǒng)的穩(wěn)定性，保證了其在電壓不平衡條件下的暫態(tài)穩(wěn)定性，同時(shí)加入VDCOL控制器，大大減少了直流過電壓、欠電壓現(xiàn)象的產(chǎn)生，提高了系統(tǒng)的抗擾動(dòng)能力。 最后，利用PSCAD/EMTDC軟件搭建了雙端VSC-HVDC系統(tǒng)仿真模型，通過對(duì)VSC-HVDC系統(tǒng)與兩端交流系統(tǒng)的功率交換及交流系統(tǒng)發(fā)生各種故障進(jìn)行仿真分析，驗(yàn)證了所設(shè)計(jì)控制器的有效性。
[Abstract]:VSC-HVDC is a new flexible DC transmission technology based on (VSC), turn-off device and pulse width modulation (PWM) technology. The method based on pulse width modulation can control active and reactive power flexibly and independently. The good control performance of rectifier and inverter in converter station is the guarantee of safe and stable operation of VSC-HVDC system, so the control of VSC-HVDC converter has become the core problem. Firstly, the operation principle of VSC-HVDC system is introduced theoretically, and the transient mathematical model in 偽 尾 two-phase stationary coordinate system is established. The power exchange control principle of the system is analyzed. It is transformed into the tracking problem of the reference values of active and reactive components of current under the condition of operating constraints. Secondly, a double closed loop controller is designed for current control in inner loop and power control in outer loop, which realizes decoupling control of active power and reactive power. In this paper, the Terminal sliding mode control is introduced into the inner loop current controller, the compound power control method of VSC side and AC side is adopted, and the Terminal sliding mode inner loop controller in 偽 尾 static coordinates is designed to realize the independent control of active power and reactive power. The anti-disturbance ability of the system is improved. The stability of the closed-loop system under the action of the controller is proved by Lyapunov theory, and the transient stability of the closed-loop system under the condition of voltage unbalance is guaranteed. At the same time, the DC overvoltage is greatly reduced by adding the VDCOL controller. The phenomenon of undervoltage improves the anti-disturbance ability of the system. Finally, the simulation model of two-terminal VSC-HVDC system is built by using PSCAD/EMTDC software. The effectiveness of the designed controller is verified by the simulation and analysis of the power exchange between VSC-HVDC system and AC system and the fault of AC system.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM721.1

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本文編號(hào)：2245034