本文選題：微電網(wǎng) + 動態(tài)相量法��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：微電網(wǎng)是分布式能源的有效利用形式。在孤島微電網(wǎng)中,大量的分布式發(fā)電單元通過逆變器接入系統(tǒng),使孤島微電網(wǎng)系統(tǒng)的電磁暫態(tài)模型變得更加復(fù)雜,而且逆變型微源具有慣性小、高頻非線性的特性,使孤島微電網(wǎng)系統(tǒng)的穩(wěn)定性易受到擾動影響。為了對孤島運(yùn)行下微電網(wǎng)的動態(tài)特性進(jìn)行研究,并從機(jī)理上分析影響系統(tǒng)穩(wěn)定性的因素,建立微電網(wǎng)動態(tài)模型并分析其穩(wěn)定性是很有必要的�；趯﹄妷涸葱湍孀兤鞯湫湍Ｐ偷膶Ρ确治�,采用動態(tài)相量法對三相電壓源型逆變器進(jìn)行建模。將三相電壓源型逆變器的動態(tài)相量模型和電磁暫態(tài)模型進(jìn)行仿真對比,表明兩種動態(tài)模型的仿真結(jié)果是一致的。將動態(tài)相量法用于描述三相電壓源型逆變器穩(wěn)態(tài)特性和主要的動態(tài)變化,并將其用于含多個逆變器的孤島微電網(wǎng)系統(tǒng)的仿真與分析。采用動態(tài)相量法建立了含多逆變器三相平衡孤島微電網(wǎng)系統(tǒng)的動態(tài)相量模型,并應(yīng)用奇異攝動法分別推導(dǎo)了不同時間尺度下孤島微電網(wǎng)的降階動態(tài)相量模型。在MATLAB/Simulink中構(gòu)建孤島微電網(wǎng)的動態(tài)相量模型,電流和頻率的仿真波形說明所建立的動態(tài)模型可以準(zhǔn)確地描述系統(tǒng)的動態(tài)特性,將完整動態(tài)相量模型與降階動態(tài)相量模型的仿真結(jié)果進(jìn)行比較,驗(yàn)證了降階模型的正確性。仿真研究表明,下垂控制系數(shù)越大,系統(tǒng)的響應(yīng)速度越快,但是當(dāng)超過一定的值時系統(tǒng)會失去穩(wěn)定。為了分析所建立孤島微電網(wǎng)動態(tài)相量模型的小信號穩(wěn)定性,采用李亞普諾夫第一方法將模型進(jìn)行小信號線性化,然后根據(jù)特征值判據(jù)判斷系統(tǒng)的穩(wěn)定性,并由頻率下垂控制系數(shù)增加時系統(tǒng)根軌跡變化情況得出能使微電網(wǎng)保持穩(wěn)定運(yùn)行的控制參數(shù)取值范圍,研究結(jié)果表明降階動態(tài)相量模型能預(yù)測系統(tǒng)的不穩(wěn)定。論文得出的使系統(tǒng)保持小信號穩(wěn)定的控制參數(shù)取值范圍可應(yīng)用于P/f控制器的設(shè)計。
[Abstract]:Microgrid is an effective form of distributed energy utilization. In the isolated island microgrid, a large number of distributed generating units are connected to the system by inverter, which makes the electromagnetic transient model of the isolated microgrid system more complex, and the inverter microsource has the characteristics of small inertia and high frequency nonlinearity. The stability of isolated microgrid system is vulnerable to disturbance. In order to study the dynamic characteristics of microgrid under isolated island operation and analyze the factors affecting the system stability from the mechanism, it is necessary to establish the dynamic model of microgrid and analyze its stability. Based on the comparison and analysis of typical models of voltage source inverter, the dynamic phasor method is used to model the three phase voltage source inverter. The dynamic phasor model and electromagnetic transient model of three-phase voltage source inverter are simulated and compared. The results show that the simulation results of the two dynamic models are consistent. The dynamic phasor method is used to describe the steady-state characteristics and main dynamic changes of three-phase voltage source inverter, and it is applied to the simulation and analysis of isolated microgrid system with multiple inverters. The dynamic phasor model of a three-phase balanced islanding microgrid system with multi-inverter is established by using the dynamic phasor method, and the reduced order dynamic phasor model of the islanding microgrid with different time scales is derived by using the singular perturbation method. The dynamic phasor model of isolated microgrid is constructed in MATLAB / Simulink. The simulation waveform of current and frequency shows that the dynamic model can accurately describe the dynamic characteristics of the system. The simulation results of the complete dynamic phasor model and the reduced order dynamic phasor model are compared to verify the correctness of the reduced order phasor model. The simulation results show that the larger the sag control coefficient, the faster the response speed of the system is, but the system will lose stability when it exceeds a certain value. In order to analyze the small signal stability of the dynamic phasor model of isolated microgrid, the Lyapunov first method is used to linearize the model, and then the stability of the system is judged according to the eigenvalue criterion. The range of control parameters which can keep the microgrid running stably can be obtained from the change of system root locus when the frequency droop control coefficient increases. The research results show that the reduced order dynamic phasor model can predict the instability of the system. It is concluded that the range of control parameters which can keep the system small signal stable can be applied to the design of P / F controller.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712

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