應用於綠色能源單相併網變流器之總諧波失真率分析

The THD Analysis for Green Energy in Single-Phase Grid Connected Inverter

謝宗煌(Tsung-Huang Hsieh) ； 陳君維(Chun-Wei Chen) ； 曹嘉祥(Jai-Siang Cao)

《中華科技大學學報》 43期 (2010/04) Pp. 105-129

https://doi.org/10.7095/JCUST.201004.0105

摘要

本文說明磁滯電流控制法和電壓源正弦脈波寬度調變(Sinusoidal Pulse Width Modulation, SPWM)電壓源控制法應用於分散式電源的單相變流器併網之總諧波失真率分析。文中說明SPWM電壓源控制法和磁滯電流控制法之控制模式，並且以PSIM軟體模擬分析其控制效果與不同特性之負載的總諧波失真率(THD%)。由模擬結果發現，磁滯電流控制法對於是否在電感器後面並聯加入電容對於THD%並沒有太大影響；而SPWM控制，濾波器有加電容比沒加電容的效果還好，意即電容器可抑制到總諧波失真率。SPWM電壓源控制法之市電供給負載之電流THD%隨負載電感性越大而越高；電感性負載磁滯電流控制法比SPWM電壓源控制法之THD%表現較低也較穩定。本文的研究結果可作為分散式發電系統(Dispersed Generation, DG)如太陽能、風力、燃料電池應用於與電網併聯前的總諧波失真率分析之參考。

關鍵字

綠色能源 ； 單相併網 ； 總諧波失真率

並列摘要

This paper discusses the hysteresis current control and the voltage source Sinusoidal Pulse Width Modulation control for the single-phase grid connected Inverter of the dispersed source. In this paper, the voltage source sinusoidal PWM control and the hysteresis current control model are discussed. The total harmonic distortion (THD) of different characteristic load are also simulated and analyzed by using the PSIM software.The simulation results show that the capacitor has less effect on THD by using the hysteresis current control method. However, there is more effect on THD by using the voltage source sinusoidal PWM control scheme in single-phase grid connected inverter. In other words, the capacitor can reduce the THD for the voltage source sinusoidal PWM control. The current THD will increase while the inductive load increases under voltage source sinusoidal PWM control scheme.The THD of the hysteresis current control for inductive load is also lower and more stable than the voltage source sinusoidal PWM control.This paper can be viewed as the total harmonic distortion analysis before the Dispersed Generation such as solar energy, the wind power or the fuel cell connecting to the utility grid.

並列關鍵字

green energy ； single-phase grid connected ； total harmonic distortion