基于Prony算法和改進Budeanu理論的電力系統(tǒng)功率測量研究
發(fā)布時間：2018-11-09 21:35
【摘要】：傳統(tǒng)基于傅里葉變換、小波變換等信號時頻變換的電力系統(tǒng)功率測量方法大多沒有考慮非整數(shù)次諧波(間諧波)的影響,采用一段時間窗的整體計算,不能得到電力系統(tǒng)具體時刻的瞬時功率,無法評估電力系統(tǒng)中的瞬態(tài)現(xiàn)象,如衰減諧波、沖擊脈沖等。另外,傳統(tǒng)方法的測量精度較低,受到采樣數(shù)據(jù)的限制。本文提出了一種基于Prony算法和改進Budeanu理論的電力系統(tǒng)功率測量方法。借鑒Fryze理論和ShepherdZakikhani理論對經(jīng)典頻域功率理論Budeanu理論進行改進,將Budeanu理論推廣到非整數(shù)次諧波情況。使用Prony算法可以將電壓和電流分解為指數(shù)函數(shù)的線性組合,精確得到頻率、振幅、初相和衰減因子等特征,進而可以計算電力系統(tǒng)的瞬時有功功率和無功功率。提出的方法充分考慮了電力系統(tǒng)中的間諧波功率以及衰減諧波、沖擊脈沖等瞬態(tài)現(xiàn)象,可以計算得到電力系統(tǒng)的瞬時功率,同時具有動態(tài)性能好,測試精度高等優(yōu)點。最后通過算例進行了仿真驗證。本文提出的功率測量方法為電力系統(tǒng)非正弦復(fù)雜情況下的功率測量、瞬態(tài)現(xiàn)象研究及諧波治理提供了一種有效的思路和方法。
[Abstract]:The traditional power measurement methods based on Fourier transform, wavelet transform and other signal time-frequency transform do not take into account the influence of non-integer harmonics (interharmonics). The instantaneous power of power system at specific time can not be obtained, and the transient phenomena in power system can not be evaluated, such as attenuation harmonics, impulse pulses and so on. In addition, the measurement accuracy of the traditional method is low, which is limited by the sampling data. This paper presents a power measurement method for power system based on Prony algorithm and improved Budeanu theory. The classical frequency-domain power theory Budeanu theory is improved by using Fryze theory and ShepherdZakikhani theory. The Budeanu theory is extended to the case of non-integer harmonics. Using Prony algorithm, the voltage and current can be decomposed into linear combination of exponential function, and the characteristics of frequency, amplitude, initial phase and attenuation factor can be obtained accurately, and the instantaneous active and reactive power of power system can be calculated. The proposed method takes full account of the interharmonic power and the transient phenomena such as attenuation harmonics and impulse pulses in power system. It can be used to calculate the instantaneous power of power system and has the advantages of good dynamic performance and high measurement accuracy. Finally, a simulation example is given. The power measurement method proposed in this paper provides an effective method for power measurement, transient phenomenon research and harmonic control in power system with non-sinusoidal complex conditions.
【作者單位】： 電子科技大學(xué)電子科學(xué)技術(shù)研究院;
【分類號】：TM933.3
，
本文編號：2321622
[Abstract]:The traditional power measurement methods based on Fourier transform, wavelet transform and other signal time-frequency transform do not take into account the influence of non-integer harmonics (interharmonics). The instantaneous power of power system at specific time can not be obtained, and the transient phenomena in power system can not be evaluated, such as attenuation harmonics, impulse pulses and so on. In addition, the measurement accuracy of the traditional method is low, which is limited by the sampling data. This paper presents a power measurement method for power system based on Prony algorithm and improved Budeanu theory. The classical frequency-domain power theory Budeanu theory is improved by using Fryze theory and ShepherdZakikhani theory. The Budeanu theory is extended to the case of non-integer harmonics. Using Prony algorithm, the voltage and current can be decomposed into linear combination of exponential function, and the characteristics of frequency, amplitude, initial phase and attenuation factor can be obtained accurately, and the instantaneous active and reactive power of power system can be calculated. The proposed method takes full account of the interharmonic power and the transient phenomena such as attenuation harmonics and impulse pulses in power system. It can be used to calculate the instantaneous power of power system and has the advantages of good dynamic performance and high measurement accuracy. Finally, a simulation example is given. The power measurement method proposed in this paper provides an effective method for power measurement, transient phenomenon research and harmonic control in power system with non-sinusoidal complex conditions.
【作者單位】： 電子科技大學(xué)電子科學(xué)技術(shù)研究院;
【分類號】：TM933.3
，
本文編號：2321622
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