電網(wǎng)諧波與無功綜合動態(tài)補償研究
發(fā)布時間：2019-01-15 22:23
【摘要】：隨著電力電子等非線性變流裝置的大量使用,給電力系統(tǒng)帶來了嚴重的諧波污染,同時這些非線性裝置的功率因數(shù)普遍較低,造成了很大的電能損耗,威脅著電力系統(tǒng)的穩(wěn)定運行�，F(xiàn)在普遍采用的諧波抑制和無功補償措施大都只對諧波和無功問題中的一種具有較好的效果,還有的受器件的限制,補償容量有限。本文研究了一種諧波與無功綜合補償方法,該系統(tǒng)同時具有HAPF和SVC的優(yōu)點,二者取長補短,可以對諧波和無功進行實時動態(tài)補償。 論文首先給出了綜合補償系統(tǒng)的結構,確定了混合有源濾波器和靜止無功補償器的接入位置；分析了系統(tǒng)的工作原理；分別建立了系統(tǒng)的基波域等效模型和諧波域等效模型,通過對模型的分析,確定系統(tǒng)實現(xiàn)諧波與無功動態(tài)補償?shù)目尚行浴?其次針對綜合補償系統(tǒng)將諧波和無功分開補償?shù)膶嶋H情況,在基于瞬時無功功率理論的ip-iq檢測方法的基礎上,將諧波和無功分開檢測,使其適用于綜合補償系統(tǒng)；針對電源電壓畸變時不能準確檢測諧波的問題,對三相電壓預處理后,再輸入到鎖相環(huán)中,有效克服了電源電壓畸變的影響；針對TCR投切過程中會產(chǎn)生諧波的問題,提出了一種TCR諧波預測方法,該方法可以實時的預測出TCR投切過程中所產(chǎn)生的諧波,然后通過混合有源濾波器將其濾除。 接下來針對綜合補償系統(tǒng)結構特點,分析了混合有源濾波器采用分頻控制方法的必要性；針對傳統(tǒng)廣義積分控制器的不足,提出一種改進的廣義積分控制器,該控制器可以根據(jù)誤差和誤差變化率,實時調(diào)整廣義積分控制器的參數(shù),使其能夠更好的跟蹤諧波電流；結合瞬時無功功率檢測方法,推導了基于瞬時無功功率的三相補償導納計算公式。 最后在Matlab/Simulink中搭建了仿真平臺,對系統(tǒng)各環(huán)節(jié)進行了建模仿真。仿真結果驗證了上述方法的有效性和可行性。
[Abstract]:With the extensive use of nonlinear converter devices such as power electronics, it brings serious harmonic pollution to power system. At the same time, the power factor of these nonlinear devices is generally lower, resulting in a great loss of electric energy. It threatens the stable operation of power system. Most of the commonly used harmonic suppression and reactive power compensation measures have a good effect on one of the harmonic and reactive power problems, and the compensation capacity is limited by the limitation of the device. In this paper, a method of harmonic and reactive power compensation is studied. The system has the advantages of both HAPF and SVC, which can compensate harmonics and reactive power dynamically. Firstly, the structure of the integrated compensation system is given, the access position of the hybrid active power filter and the static var compensator is determined, and the working principle of the system is analyzed. The fundamental domain equivalent model and harmonic domain equivalent model of the system are established respectively. Through the analysis of the model, the feasibility of realizing harmonic and reactive power dynamic compensation of the system is determined. Secondly, aiming at the actual situation that harmonic and reactive power are compensated separately in the comprehensive compensation system, the harmonic and reactive power are detected separately on the basis of ip-iq detection method based on instantaneous reactive power theory, so that it can be applied to the comprehensive compensation system. Aiming at the problem that harmonics can not be detected accurately when the power supply voltage is distorted, the three-phase voltage is pretreated and then input into the phase-locked loop, which effectively overcomes the influence of the voltage distortion of the power supply. In order to solve the problem of harmonic generation in TCR switching process, a TCR harmonic prediction method is proposed. This method can predict the harmonics generated in TCR switching process in real time, and then filter it out by hybrid active power filter (APF). Secondly, according to the structural characteristics of the integrated compensation system, the necessity of adopting the frequency division control method for the hybrid active power filter is analyzed. In view of the shortcomings of the traditional generalized integral controller, an improved generalized integral controller is proposed. The controller can adjust the parameters of the generalized integral controller in real time according to the error and error rate, so that it can track the harmonic current better. Combined with the instantaneous reactive power detection method, a three-phase compensation admittance calculation formula based on instantaneous reactive power is derived. Finally, the simulation platform is built in Matlab/Simulink, and the system is modeled and simulated. Simulation results verify the effectiveness and feasibility of the above method.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761.12
本文編號：2409170
[Abstract]:With the extensive use of nonlinear converter devices such as power electronics, it brings serious harmonic pollution to power system. At the same time, the power factor of these nonlinear devices is generally lower, resulting in a great loss of electric energy. It threatens the stable operation of power system. Most of the commonly used harmonic suppression and reactive power compensation measures have a good effect on one of the harmonic and reactive power problems, and the compensation capacity is limited by the limitation of the device. In this paper, a method of harmonic and reactive power compensation is studied. The system has the advantages of both HAPF and SVC, which can compensate harmonics and reactive power dynamically. Firstly, the structure of the integrated compensation system is given, the access position of the hybrid active power filter and the static var compensator is determined, and the working principle of the system is analyzed. The fundamental domain equivalent model and harmonic domain equivalent model of the system are established respectively. Through the analysis of the model, the feasibility of realizing harmonic and reactive power dynamic compensation of the system is determined. Secondly, aiming at the actual situation that harmonic and reactive power are compensated separately in the comprehensive compensation system, the harmonic and reactive power are detected separately on the basis of ip-iq detection method based on instantaneous reactive power theory, so that it can be applied to the comprehensive compensation system. Aiming at the problem that harmonics can not be detected accurately when the power supply voltage is distorted, the three-phase voltage is pretreated and then input into the phase-locked loop, which effectively overcomes the influence of the voltage distortion of the power supply. In order to solve the problem of harmonic generation in TCR switching process, a TCR harmonic prediction method is proposed. This method can predict the harmonics generated in TCR switching process in real time, and then filter it out by hybrid active power filter (APF). Secondly, according to the structural characteristics of the integrated compensation system, the necessity of adopting the frequency division control method for the hybrid active power filter is analyzed. In view of the shortcomings of the traditional generalized integral controller, an improved generalized integral controller is proposed. The controller can adjust the parameters of the generalized integral controller in real time according to the error and error rate, so that it can track the harmonic current better. Combined with the instantaneous reactive power detection method, a three-phase compensation admittance calculation formula based on instantaneous reactive power is derived. Finally, the simulation platform is built in Matlab/Simulink, and the system is modeled and simulated. Simulation results verify the effectiveness and feasibility of the above method.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761.12
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