電流餘值偵測法實作

圖 4.14 為使用電流餘值偵測法下時之故障偵知結果，當此方法操作在不同K 值下時，可以看出其故障偵知速度皆為 4ms，可知不同的K值並不影響其偵知速 度。其中馬達中性點分別於t 、₁ t 、₂ t 連接至電源測電容中點。 ₃

(a) FTa

ia

ib i_c

20ms 4ms

(b) 4ms

FTa

ia

ibi_c

4ms FTa

ia

ibi_c

(c)

2A

2A

2A 20ms

20ms t1

t2

t3

圖 4.14 電流餘值偵測法在(a)K 1.1(b)K 1.5(c)K 1.9下之故障偵知速度

第五章 結論

本文呈現單反流器供電之三相永磁同步馬達開路故障偵測與控制，從三相永 磁同步馬達的推導開始，再分析探討三相馬達接線方式，並以模擬與實驗的方 式，驗證偵測與控制方法的可行性。

所採用的偵測架構主要使用電流平均偵測法及餘值電流偵測法，前者利用計 算出電流平均值是否小於故障取樣點來判斷是否發生故障。後者經由計算後得到 三個餘值，若其中有餘值為正則代表該相發生故障。

在平均電流偵測法中，所選擇的固定取樣個數N越小，其偵知故障的速度 較快，但錯誤偵測的風險也隨之增加，可說是有利有弊，並且此偵測法並不適用 於負載小之情況。

而在電流餘值偵測法中，K值並不會影響偵知故障的速度，但是若K值越 小，則錯誤偵測的風險也隨之增加，故當使用此偵測法時，將K設定於越接近 2 的值效益越好，並且此偵測法適用於任何大小之負載。

在故障過渡控制的部份在連接馬達中性點後轉速及轉矩尚有些許之震盪情 況，如何更進一步改善此控制架構下馬達之運轉，是未來可繼續探討深究的。

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