PWM整流器的不平衡控制策略研究
發(fā)布時間：2018-11-20 20:53
【摘要】：本文在電網電壓平衡時控制策略的基礎上，研究在電網電壓不平衡時，三相電壓型PWM整流器的控制策略。 不平衡電壓可以表示為正序電壓，負序電壓，零序電壓之和。電網不平衡時，由于負序電壓的存在，會導致電網角度獲取出現(xiàn)偏差，交流側電流不對稱運行，直流母線電壓抖動。要對正負序電流分別進行控制，前提是對電壓電流進行正負序分離，在論文中介紹了延遲法，陷波器法和低通濾波器法。 電網不平衡時，由于負序電壓的影響，系統(tǒng)會產生負序電流，負序電流與正序開關函數的乘積，會使輸出直流電壓產生諧波。針對穩(wěn)定直流母線和輸入三相電流對稱運行的不同要求，提出了功率平衡的電壓不平衡控制策略和電流對稱的電壓不平衡控制策略。 電流對稱的電壓不平衡控制策略是在兩相正同步參考坐標下實現(xiàn)的，通過對整流橋交流側的電壓矢量疊加負序電壓補償，使負序電流為零，這樣就能達到電流對稱運行的目的。 如果輸出側直流母線電壓穩(wěn)定，在負載不變的情況下，輸入的功率是不變的，這就要求輸入側存在負序電流。根據這個原則提出了在兩相靜止參考坐標下的內�？刂破鞣ê蛢上嗤絽⒖甲鴺讼碌乃拈]環(huán)控制法，，四閉環(huán)控制法是在雙閉環(huán)的基礎上，增加了負序分量的雙閉環(huán)，控制效果好。兩相靜止參考坐標的內�？刂破鞣�，對于正序分量負序分量用同一個通道進行控制，相對四閉環(huán)的系統(tǒng)控制結構簡單。 在已有實驗平臺的基礎上進行了改造，用接觸式調壓器構建簡單的三相不平衡電壓，通過實驗驗證了對稱電流控制策略的正確性。
[Abstract]:Based on the control strategy of voltage balance, the control strategy of three-phase voltage source PWM rectifier is studied in this paper. Unbalanced voltage can be expressed as the sum of positive sequence voltage, negative sequence voltage and zero sequence voltage. When the power network is unbalanced, because of the existence of the negative sequence voltage, it will lead to the deviation of the power grid angle acquisition, the asymmetrical operation of the AC side current, and the DC bus voltage jitter. In order to control the positive and negative sequence current separately, it is necessary to separate the voltage and current in a positive and negative sequence. In this paper, the delay method, notch filter method and low pass filter method are introduced. When the power network is unbalanced, the system will produce negative sequence current due to the influence of negative sequence voltage, and the product of negative sequence current and positive sequence switching function will make the output DC voltage produce harmonics. According to the different requirements of stable DC bus and input three-phase current symmetrical operation, a voltage unbalanced control strategy with power balance and a voltage unbalanced control strategy with current symmetry are proposed. The voltage imbalance control strategy of current symmetry is realized under the two phase positive synchronous reference coordinates. By adding the voltage vector of the AC side of the rectifier bridge to the negative sequence voltage compensation, the negative sequence current is zero, and the purpose of current symmetry operation can be achieved. If the output DC bus voltage is stable and the input power is invariant under the condition of constant load the negative sequence current is required on the input side. According to this principle, the internal model controller method in two phase static reference coordinates and the four closed loop control method in two phase synchronous reference coordinates are proposed. The four closed loop control method is based on the double closed loop, and the negative sequence component is added to the double closed loop. The control effect is good. The internal model controller method of two phase static reference coordinates is used to control the negative sequence component of the positive sequence component with the same channel. The control structure of the system is simpler than that of the four closed loop system. On the basis of the existing experimental platform, a simple three-phase unbalanced voltage is constructed by using a contact voltage regulator, and the correctness of the symmetrical current control strategy is verified by experiments.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM461
本文編號：2345989
[Abstract]:Based on the control strategy of voltage balance, the control strategy of three-phase voltage source PWM rectifier is studied in this paper. Unbalanced voltage can be expressed as the sum of positive sequence voltage, negative sequence voltage and zero sequence voltage. When the power network is unbalanced, because of the existence of the negative sequence voltage, it will lead to the deviation of the power grid angle acquisition, the asymmetrical operation of the AC side current, and the DC bus voltage jitter. In order to control the positive and negative sequence current separately, it is necessary to separate the voltage and current in a positive and negative sequence. In this paper, the delay method, notch filter method and low pass filter method are introduced. When the power network is unbalanced, the system will produce negative sequence current due to the influence of negative sequence voltage, and the product of negative sequence current and positive sequence switching function will make the output DC voltage produce harmonics. According to the different requirements of stable DC bus and input three-phase current symmetrical operation, a voltage unbalanced control strategy with power balance and a voltage unbalanced control strategy with current symmetry are proposed. The voltage imbalance control strategy of current symmetry is realized under the two phase positive synchronous reference coordinates. By adding the voltage vector of the AC side of the rectifier bridge to the negative sequence voltage compensation, the negative sequence current is zero, and the purpose of current symmetry operation can be achieved. If the output DC bus voltage is stable and the input power is invariant under the condition of constant load the negative sequence current is required on the input side. According to this principle, the internal model controller method in two phase static reference coordinates and the four closed loop control method in two phase synchronous reference coordinates are proposed. The four closed loop control method is based on the double closed loop, and the negative sequence component is added to the double closed loop. The control effect is good. The internal model controller method of two phase static reference coordinates is used to control the negative sequence component of the positive sequence component with the same channel. The control structure of the system is simpler than that of the four closed loop system. On the basis of the existing experimental platform, a simple three-phase unbalanced voltage is constructed by using a contact voltage regulator, and the correctness of the symmetrical current control strategy is verified by experiments.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM461
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