3 控制系統(tǒng)
3.1控制框圖
TFM4.1-020-300-W1-115 準(zhǔn)單級(jí)式微逆變器需同時(shí)完成MPPT、鎖相、孤島檢測(cè)和入網(wǎng)電流控制[5][6]。如圖2所示，通過(guò)MPPT計(jì)算提供得到的并網(wǎng)電流的基準(zhǔn)幅值Io大小，從而確保光伏組件以最大功率向電網(wǎng)傳輸能量。鎖相提供并網(wǎng)電流的相位信息，確保入網(wǎng)電流與電網(wǎng)電壓同頻同相。孤島檢測(cè)是并網(wǎng)逆變器所必須具備的功能，在電網(wǎng)異常情況下關(guān)閉逆變器，確保人員和設(shè)備的安全。入網(wǎng)電流控制是并網(wǎng)逆變器的核心控制部分，這里通過(guò)采樣輸出電流閉環(huán)控制，確保了高質(zhì)量的并網(wǎng)電流（理論上在DCM下，開(kāi)環(huán)控制即可實(shí)現(xiàn)電流源并網(wǎng)，但其并網(wǎng)電流總諧波含量相對(duì)較高）。
3.jpg
圖2 控制系統(tǒng)
3.2TFM4.1-020-300-W1-115準(zhǔn)單級(jí)式系統(tǒng)MPPT及直流母線電壓控制
MPPT是通過(guò)相應(yīng)的算法，不斷調(diào)整并網(wǎng)電流基準(zhǔn)，調(diào)整逆變器輸出功率，從而調(diào)節(jié)光伏組件的輸出功率，使得光伏組件輸出功率最大。
TFM4.1-020-300-W1-115擾動(dòng)觀察法原理簡(jiǎn)單，易于實(shí)現(xiàn)，是MPPT算法中最常用的方法之一。其算法原理是當(dāng)前次的輸出功率與前一次的輸出功率作比較，假設(shè)P(k 1)>P(k)，那么將光伏輸出電壓基準(zhǔn)繼續(xù)向著這一次變化的相同的方向進(jìn)行擾動(dòng)；反之，若輸出功率變小，則在下個(gè)周期改變擾動(dòng)的方向，如此進(jìn)行反復(fù)擾動(dòng)、比較直至光伏系統(tǒng)輸出功率達(dá)到最大。算法流程如圖3所示。擾動(dòng)觀察法步長(zhǎng)的大小決定了算法跟蹤的速度和系統(tǒng)在最高處附近來(lái)回振蕩的幅度，因此，本文采取一種變步長(zhǎng)的擾動(dòng)觀察法[7]，具體方式當(dāng)功率較每小時(shí)，擾動(dòng)值C取值加大；當(dāng)功率較大后，適當(dāng)減小擾動(dòng)值C的取值。
4.jpg
圖3擾動(dòng)觀察法算法流程
TFM4.1-020-300-W1-115在準(zhǔn)單級(jí)并網(wǎng)逆變系統(tǒng)中，單純的MPPT 環(huán)無(wú)法保證很好的動(dòng)態(tài)性能，實(shí)現(xiàn)系統(tǒng)的穩(wěn)定。當(dāng)發(fā)生外界條件突變或者程序誤判斷時(shí)，直流母線電壓會(huì)劇烈震蕩甚至奔潰。如圖3所示，在原有的控制基礎(chǔ)上加一個(gè)輸入電壓環(huán)，防止在MPPT 誤判斷時(shí)直流母線電壓的劇烈震蕩，可以有效防止母線電壓的崩潰，實(shí)現(xiàn)系統(tǒng)的穩(wěn)定運(yùn)行。
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Okuma OPUS 5000 main card puncherE4809-045-038C
Okuma OPUS 5000 E4809-032-490-D
Okuma OPUS 5000 BUBBLE MEMORY 4Mbit x2 E0227-702-008
OKUMA E4809-436-015-B
OKUMA OPUS 5000 2 DATA BOARD 2 E4809-045-073-D
Okuma OPUS 5000 II SVP Control Board E4809-045-109-E
Okuma opus 7000 DRIVE BLII-D50-30A top board E4809-770-065A
Okuma opus 7000 DRIVE BLII-D50A top board E4809-770-069A
OKUMA OPUS 7000 CCOP2 CARD E4809-436-055A 1
OKUMA OPUS 7000 EXP126-0A
EXP126-0A
OKUMA OPUS 7000 EXP126-0A
OKUMA 7000 FUB-DRII 1911-2245-39.245
OKUMA 7000 FUB-P4R2 1911-2242-78.126
E4809045109F
OKUMA E4809-045-109-F
OKUMA E4809-045-091 OPUS 5000 OSP 5020 MAIN BOARD
Okuma BLII-D150A E4809-770-069-A
E4809-820-005-B
OKUMA E4809-770-050
OKUMA E4809-045-106
Okuma BL-D75A BLD75A _ E4809-770-015-D
Okuma Spindle Drive VAC unit D11-A Board E4809-045-140
E4809045088-B
OKUMA E4809-045-088-B
Okuma E0105-437-051
BLMS125E30T
Okuma BL Motor BL-MS125E-30T BLMS125E30T BLMS125E
Okuma BL-Motor BL-80E-20T_BL80E20T_BL-8OE-2OT
BL50E20T
Okuma BL Motor BL-50E-20T
Okuma VAC Spindle Motor VAC-MML11/7.5R-152
E4809032399F
OKUMA E4809-032-399-F
E4809045010A
OKUMA E4809-045-010-A
Okuma Panex Card 3A E0241-653-096
Okuma Motor BL-120E-20T
Okuma MC-4VA
Okuma ATC Panel OSP 5000 Operator Unit #E0189-653-015
Okuma E4809-747-005-D
BL-D50A
OKUMA BL-D50A
BLII-D50-30A
OKUMA 7000 DRIVE BLII-D50-30A
OKUMA 7000 FUB-P4M4 1911-2241-103.178
OKUMA 7000 FUB-P4M4 1911-2241-103.179
OKUMA 7000 FUB-P4R2 1911-2242-78.162
OKUMA 7000 FUB-DRII 1911-2245-40.182
OKUMA Model GU-24S
E4809436002A
Okuma E4809-436-002-A
Okuma E4809-747-005-D
Okuma E4809-747-005-D
OKUMA E0227-702-008
OKUMA E0451-521-051
OKUMA OSP 5000 Inductosyn PreAmp E0215-541-002
Okuma CNC OPUS5000 SVPO Board E4809-463-003A
Okuma CNC OPUS5000 TBO Board E4809-032-496-C
Okuma CNC OPUS5000 E4809-045-035-C
E4809032452C
OKUMA E4809-032-452-C
Okuma CNC 4mb Bubble Memory E0227-702-005
E4809436016C
OKUMA E4809-436-016-C
Okuma CNC OPUS5000 Main Card5 E4809-045-044
OKUMA E4809-045-109
Okuma CNC OPUS5000 Main Card4-2 E4809-032-474-A
FM4.1-050-300-W1-220
