基于阻抗分析法的雙饋風力發(fā)電機系統(tǒng)穩(wěn)定性研究
發(fā)布時間：2018-08-26 06:50
【摘要】：作為在地球上存儲量巨大、可以清潔利用的可再生能源,風能的開發(fā)是新能源發(fā)電領(lǐng)域重要的研究內(nèi)容。雙饋式風力發(fā)電機是目前使用最多的風力發(fā)電機組類型之一。受電網(wǎng)條件與自身控制系統(tǒng)的交互影響,雙饋電機在并網(wǎng)發(fā)電過程中會出現(xiàn)各類穩(wěn)定性問題。因此,本文采用阻抗分析的方法針對雙饋風力發(fā)電機與各種條件電網(wǎng)的連接系統(tǒng)的穩(wěn)定性展開研究工作,主要研究內(nèi)容包括:建立雙饋電機二階矩陣形式與復矢量形式的等效導納模型、應(yīng)用阻抗分析方法分析雙饋電機在弱電網(wǎng)條件下的穩(wěn)定性和使用改變雙饋電機導納特性的方法抑制串補條件下發(fā)生的次同步振蕩問題。應(yīng)用阻抗分析方法進行雙饋電機與電網(wǎng)連接系統(tǒng)的穩(wěn)定性分析是本文的主要研究內(nèi)容。本文建立了考慮雙饋電機定、轉(zhuǎn)子磁鏈暫態(tài)以及轉(zhuǎn)子側(cè)變流器電流環(huán)、鎖相環(huán)、有功功率外環(huán)以及交流電壓幅值外環(huán)的雙饋電機等效輸入導納模型,并通過頻率掃描的方法在仿真中測量雙饋電機的等效輸入導納驗證推導出的模型的正確性。建立弱電網(wǎng)、串補條件下的線路阻抗模型,結(jié)合推導的雙饋電機等效導納模型,依據(jù)廣義奈奎斯特穩(wěn)定性判據(jù)分析系統(tǒng)的穩(wěn)定性。考慮到在兩相旋轉(zhuǎn)坐標系下建立的雙饋電機導納模型是二階矩陣形式,在進行穩(wěn)定性分析時需要使用針對多輸入多輸出系統(tǒng)的廣義奈奎斯特穩(wěn)定性判據(jù),分析過程相對復雜,本文建立了考慮鎖相環(huán)控制器的復矢量形式的雙饋電機等效導納模型。使用復矢量形式的模型根據(jù)奈奎斯特穩(wěn)定性判據(jù)進行系統(tǒng)的穩(wěn)定性分析,可以簡化分析過程。針對串補條件下雙饋系統(tǒng)可能發(fā)生的次同步振蕩問題,本文使用了改變雙饋電機等效輸入導納特性的抑制方法。當次同步振蕩問題發(fā)生時,在轉(zhuǎn)子側(cè)控制器中加入濾波器改變雙饋電機在次同步頻率范圍內(nèi)的導納特性。該方法不需要額外的設(shè)備,較容易實現(xiàn),且能夠有效地抑制次同步振蕩問題。在實驗室的雙饋平臺上完成了弱電網(wǎng)條件下雙饋系統(tǒng)穩(wěn)定性分析的實驗驗證。
[Abstract]:As a renewable energy with huge storage capacity and clean utilization, wind energy development is an important research content in the field of new energy generation. Doubly-fed wind turbine is one of the most widely used wind turbine generators. Due to the interaction between the power system and its own control system, various stability problems will occur in the grid-connected generation process of the doubly-fed generator. Therefore, the impedance analysis method is used to study the stability of the connection system between the doubly-fed wind turbine and the power grid under various conditions. The main research contents are as follows: the equivalent admittance models of second-order matrix form and complex vector form of doubly-fed machine are established. The method of impedance analysis is used to analyze the stability of a doubly-fed machine under the condition of weak electric net and the method of changing the admittance characteristic of the double-fed machine is used to suppress the sub-synchronous oscillation under the condition of series compensation. The stability analysis of doubly-fed motor and grid connection system using impedance analysis method is the main content of this paper. In this paper, an equivalent input admittance model of a doubly-fed machine considering stator, rotor flux chain transient and rotor side converter current loop, phase-locked loop, active power outer loop and AC voltage amplitude outer loop is established. The equivalent input admittance of the doubly-fed machine is measured by frequency scanning method to verify the correctness of the derived model. The line impedance model under the condition of weak electric network and series compensation is established. Combined with the equivalent admittance model of doubly-fed machine, the stability of the system is analyzed according to the generalized Nyquist stability criterion. Considering that the admittance model of doubly-fed machine established in two-phase rotating coordinate system is a second-order matrix form, the generalized Nyquist stability criterion for multi-input and multi-output systems is needed in the stability analysis, and the analysis process is relatively complex. In this paper, an equivalent admittance model of a doubly-fed machine considering the complex vector form of a phase-locked loop controller is established. Using the complex vector model to analyze the stability of the system based on Nyquist stability criterion can simplify the analysis process. In order to solve the problem of subsynchronous oscillation in doubly-fed system under series-compensated condition, a method to reduce the equivalent input admittance characteristics of doubly-fed system is proposed in this paper. When the sub-synchronous oscillation problem occurs, a filter is added to the rotor side controller to change the admittance characteristics of the doubly-fed machine in the sub-synchronous frequency range. The method is easy to implement without additional equipment and can effectively suppress the subsynchronous oscillation problem. The experimental verification of the stability analysis of the doubly-fed system under the condition of weak electric net is carried out on the double-fed platform in the laboratory.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM315
本文編號：2204064
[Abstract]:As a renewable energy with huge storage capacity and clean utilization, wind energy development is an important research content in the field of new energy generation. Doubly-fed wind turbine is one of the most widely used wind turbine generators. Due to the interaction between the power system and its own control system, various stability problems will occur in the grid-connected generation process of the doubly-fed generator. Therefore, the impedance analysis method is used to study the stability of the connection system between the doubly-fed wind turbine and the power grid under various conditions. The main research contents are as follows: the equivalent admittance models of second-order matrix form and complex vector form of doubly-fed machine are established. The method of impedance analysis is used to analyze the stability of a doubly-fed machine under the condition of weak electric net and the method of changing the admittance characteristic of the double-fed machine is used to suppress the sub-synchronous oscillation under the condition of series compensation. The stability analysis of doubly-fed motor and grid connection system using impedance analysis method is the main content of this paper. In this paper, an equivalent input admittance model of a doubly-fed machine considering stator, rotor flux chain transient and rotor side converter current loop, phase-locked loop, active power outer loop and AC voltage amplitude outer loop is established. The equivalent input admittance of the doubly-fed machine is measured by frequency scanning method to verify the correctness of the derived model. The line impedance model under the condition of weak electric network and series compensation is established. Combined with the equivalent admittance model of doubly-fed machine, the stability of the system is analyzed according to the generalized Nyquist stability criterion. Considering that the admittance model of doubly-fed machine established in two-phase rotating coordinate system is a second-order matrix form, the generalized Nyquist stability criterion for multi-input and multi-output systems is needed in the stability analysis, and the analysis process is relatively complex. In this paper, an equivalent admittance model of a doubly-fed machine considering the complex vector form of a phase-locked loop controller is established. Using the complex vector model to analyze the stability of the system based on Nyquist stability criterion can simplify the analysis process. In order to solve the problem of subsynchronous oscillation in doubly-fed system under series-compensated condition, a method to reduce the equivalent input admittance characteristics of doubly-fed system is proposed in this paper. When the sub-synchronous oscillation problem occurs, a filter is added to the rotor side controller to change the admittance characteristics of the doubly-fed machine in the sub-synchronous frequency range. The method is easy to implement without additional equipment and can effectively suppress the subsynchronous oscillation problem. The experimental verification of the stability analysis of the doubly-fed system under the condition of weak electric net is carried out on the double-fed platform in the laboratory.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM315
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