發明
中華民國
104107338
I 530082
可允許電感值變化之三相模組化多階換流器電流控制方法
國立清華大學
2016/04/11
提出適用於MMC結構的D-Σ控制方法。該控制方法採用積分方式代替分切和合整兩個步驟的運算,且獲得在所有區間內通用的分切合整特徵方程式,在控制特徵方程式中考量電感值變化,將換流器控制為電流源,使得換流器電流能夠在電感值變化較大時也可精確追蹤至正弦波參考電流;調變方式和電容電壓平衡方法上分別採用子模組統一電壓調變方法和排序均壓演算法,可通過控制演算法直接求出各臂導通模組數的變化規律,不需要進行複雜的扇區判斷和查表運算,而處理器的運算量和存儲量相對較小許多。 The main purpose of the present invention is to provide a D-Σ method for controlling a three-phase MMC with inductance changes allowed. Another purpose of the present invention is to calculate voltages corresponding to the current changes by obtaining inductance values following the current changes and building a table in a single chip, where, with consideration of inductance changes during calculation, circuit gains are quickly adjusted to resolve mains current distortion owing to big inductance changes; the present invention does not need coordinate conversions, sector judgments and directly calculates a number of conducted submodules of each arm according to a characteristic equation; and the present invention has a simple process, a small amount of calculation and an easy digital control.
智財技轉組
03-5715131-62219
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