本文選題：低頻振蕩 + 廣域阻尼控制　； 參考：《南京師范大學(xué)》2015年碩士論文

【摘要】：電力系統(tǒng)規(guī)模的不斷擴大使得大電網(wǎng)區(qū)域間低頻振蕩成為電力系統(tǒng)穩(wěn)定的重要問題。傳統(tǒng)的采用本地信號作為輸入的電力系統(tǒng)穩(wěn)定器不能很好地解決這種問題。廣域測量系統(tǒng)可以提供廣域反饋信號用于勵磁控制,增強多機系統(tǒng)的阻尼,從而抑制區(qū)域間低頻振蕩。廣域信號不可避免地存在通信時滯,時滯會降低控制效果。模糊控制是一種不需要建立復(fù)雜數(shù)學(xué)模型的非線性控制方法,其魯棒性和適應(yīng)性較好。因此,利用模糊控制技術(shù)補償廣域信號的時滯,對增強電力系統(tǒng)的阻尼,提高電力系統(tǒng)穩(wěn)定性具有重要的意義。本文將廣域信號作為附加穩(wěn)定信號用于發(fā)電機勵磁控制,應(yīng)用模糊控制技術(shù)補償通信時滯�；谀：刂萍夹g(shù)設(shè)計了三種廣域阻尼控制器：Mamdani型、模糊自適應(yīng)PID和T-S型廣域阻尼控制器。模糊控制規(guī)則是設(shè)計模糊控制器的核心,以往的規(guī)則大都根據(jù)專家經(jīng)驗確定,文中在設(shè)計Mamdani型模糊控制器時介紹了一種確定模糊規(guī)則的方法,所設(shè)計的控制器性能良好。提出了模糊自適應(yīng)PID廣域阻尼控制器設(shè)計方法。運用PID補償廣域信號時滯,利用模糊推理系統(tǒng)改變PID增益,達(dá)到自適應(yīng)變增益的目的。提出了采用云模型和T-S型模糊系統(tǒng)的廣域阻尼控制器。用T-S模糊推理系統(tǒng)補償廣域信號時滯,用云模型確定T-S推理系統(tǒng)的權(quán)值。T-S模糊推理系統(tǒng)和云模型相結(jié)合,能夠增強控制系統(tǒng)的魯棒性。數(shù)字仿真結(jié)果表明,本文提出的這2種控制器能很好的補償通信時滯,增強互聯(lián)系統(tǒng)的阻尼,抑制低頻振蕩,提高電力系統(tǒng)的穩(wěn)定性。電力系統(tǒng)半實物實時仿真技術(shù)既可以模擬電網(wǎng)實時運行特性,又能解決真實系統(tǒng)測試中環(huán)境制約的難題,測試結(jié)果接近實際情況。RT-LAB在大型電網(wǎng)高精度實時仿真方面有明顯的優(yōu)點,能夠精確模擬目前電力系統(tǒng)中的各種電磁暫態(tài)過程。本文用RT-LAB實時仿真平臺進(jìn)行廣域阻尼控制器硬件在環(huán)仿真實驗。4機2區(qū)域電力系統(tǒng)用RT-LAB仿真軟件實現(xiàn)實時仿真,以DSP為核心的硬件和軟件系統(tǒng)實現(xiàn)“基于模糊自適應(yīng)PID的廣域阻尼控制”和“T-S型廣域阻尼控制”功能。RT-LAB實時仿真平臺與DSP為核心的廣域阻尼控制器構(gòu)成硬件在環(huán)仿真系統(tǒng),這種硬件在環(huán)半實物仿真實驗結(jié)果驗證了理論分析的正確性和可行性以及廣域阻尼控制器應(yīng)用的有效性。
[Abstract]:With the continuous expansion of power system scale, low frequency oscillation between large power grids becomes an important issue of power system stability. The traditional power system stabilizer using local signal as input can not solve this problem well. Wide-area measurement system can provide wide-area feedback signal for excitation control, enhance the damping of multi-machine system, and suppress the inter-region low-frequency oscillation. Communication delay is inevitable in wide area signal, which will reduce the control effect. Fuzzy control is a nonlinear control method which does not need to establish complex mathematical models. Its robustness and adaptability are good. Therefore, it is very important to use fuzzy control technology to compensate the time delay of wide area signal for enhancing the damping of power system and improving the stability of power system. In this paper, the wide-area signal is used as the additional stable signal for generator excitation control, and the fuzzy control technique is applied to compensate the communication delay. Based on the fuzzy control technology, three kinds of wide-area damping controllers, namely: Mamdani type, fuzzy adaptive PID controller and T-S type wide-area damping controller, are designed. The rule of fuzzy control is the core of designing fuzzy controller. Most of the former rules are determined according to expert experience. This paper introduces a method of determining fuzzy rules when designing Mamdani fuzzy controller, and the controller designed has good performance. The design method of fuzzy adaptive PID wide area damping controller is presented. PID is used to compensate wide area signal delay and fuzzy inference system is used to change the PID gain to achieve the purpose of adaptive variable gain. A wide-area damping controller using cloud model and T-S fuzzy system is proposed. The T-S fuzzy inference system is used to compensate the wide-area signal delay and the cloud model is used to determine the weight of T-S inference system. The combination of T-S fuzzy inference system and cloud model can enhance the robustness of the control system. The digital simulation results show that the two controllers proposed in this paper can compensate the communication delay, enhance the damping of interconnected systems, suppress low frequency oscillation and improve the stability of power system. The power system hardware-in-the-loop real-time simulation technology can not only simulate the real-time operation characteristics of the power system, but also solve the problem of environmental constraints in the real system testing. The test results are close to the actual situation. RT-lab has obvious advantages in high-precision real-time simulation of large power network, and can accurately simulate various electromagnetic transient processes in power system at present. In this paper, RT-LAB real-time simulation platform is used to realize real-time simulation of wide area damping controller hardware in loop simulation experiment. 4 machine 2 area power system is simulated by RT-LAB software. The hardware and software system with DSP as the core realizes the functions of "wide area damping control based on fuzzy adaptive PID" and "T-S type wide area damping control". The real-time simulation platform based on RT-lab and the wide area damping controller with DSP as the core constitute the hardware in loop simulation system. The hardware-in-the-loop simulation results demonstrate the correctness and feasibility of the theoretical analysis and the validity of the wide area damping controller.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM712

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