Omron 3G2A5-OD411 高壓直流輸電系統(tǒng)直流側(cè)的諧波電壓和諧波電流主要是12次、24次、36次……等，在系統(tǒng)中裝設(shè)有源濾波器可選擇兩種方式：串聯(lián)式或并聯(lián)式。本文的直流濾波器如圖1所示，由12/24次雙調(diào)諧無源濾波器與有源濾波器串聯(lián)組成混合型濾波系統(tǒng)，并聯(lián)在直流母線之間。系統(tǒng)中將有源濾波器串接在無源濾波器底端，另一端接DC零線，以降低有源濾波器的絕緣水平。這里有源濾波器的作用是減小雙調(diào)諧濾波器在諧振點(diǎn)的阻抗，提高其濾波效果，另外濾除無源濾波器不能濾去的其他次諧波（如對(duì)通訊線路干擾比較嚴(yán)重的18次諧波以及一些高次諧波），這些諧波分量含量比較小。
2直流有源濾波器的工作原理
直流有源電力濾波器（DCAPF）與交流有源電力濾波器，也就是我們一般所說的有源電力濾波器（APF），都是采用主動(dòng)的而不是被動(dòng)的方法或手段去吸收或消除諧（紋）波。因而直流有源電力濾波器和交流有源電力濾波器的工作原理是相同或相近的。但是，由于作用的對(duì)象不同，直流有源電力濾波器也有自己的特點(diǎn)。與交流有源電力濾波器相似，按照其與直流負(fù)載的聯(lián)結(jié)方式，直流有源電力濾波器也可分為串聯(lián)直流有源電力濾波器和并聯(lián)直流有源電力濾波器，分別如圖1和圖2所示。串聯(lián)直流有源電力濾波器的工作原理是：檢測整流器經(jīng)平波電抗器（無源濾波器）后的輸出電壓，如圖1所示，通過低通濾波器將紋波電壓分離出來，用此信號(hào)控制直流有源電力濾波器的輸出電壓，并使與的大小相等，相位相反，從而達(dá)到顯著減小直流負(fù)載中紋波電流的目的，在理論上完全可以使直流負(fù)載中不存在紋波電壓。這里，直流有源電力濾波器相當(dāng)于電壓控制電壓源（VCVS）的逆變器。嚴(yán)格地講，采用串聯(lián)直流有源電力濾波器時(shí)，可以不必串聯(lián)平波電抗器。
系統(tǒng)中的諧波電壓源，ZS為諧波源的內(nèi)阻抗，ZL為直流傳輸線阻抗，Zf為無源濾波器的阻抗（包括耦合變壓器的漏抗），為有源濾波器注入系統(tǒng)的諧波電壓源，該電壓源與直流母線上的諧波電流有關(guān)。
線路上的諧波電流由兩部分組成：由產(chǎn)生的諧波電流和由產(chǎn)生的諧波電流。由疊加原理可得，
通過檢測線路上的電流，輸出對(duì)有源濾波器的逆變器進(jìn)行PWM控制的信號(hào)，進(jìn)而得到補(bǔ)償線路上諧波電流所需的、有源濾波器注入系統(tǒng)的等效電壓源
當(dāng)k=0時(shí)，有源濾波器不起作用，線路上的諧波電流取決于無源濾波器的濾波效果;當(dāng)k》0時(shí)，有源濾波器與無源濾波器構(gòu)成混合型濾波器，共同抑制線路上的諧波電流。而且可以看出當(dāng)k足夠大時(shí)，線路上的諧波電流可以得到完全濾除。實(shí)際上k不可能做到足夠大，所以只能對(duì)諧波電流進(jìn)行一定程度的抑制和消除。
3直流有源濾波器控制系統(tǒng)結(jié)構(gòu)
根據(jù)上述有源濾波器工作原理分析，可以得到該有源濾波器的控制系統(tǒng)結(jié)構(gòu)圖如圖3所示。通過電流檢測電路檢測出線路上的電流，經(jīng)過Butterworth低通濾波電路得到線路上的諧波電流信號(hào)，該諧波電流信號(hào)作為產(chǎn)生PWM控制信號(hào)的給定信號(hào)，與有源濾波器反饋信號(hào)相比較得出一偏差信號(hào)。滯環(huán)比較器根據(jù)該偏差信號(hào)得到控制主電路開關(guān)器件通斷的PWM信號(hào)，從而得到抑制線路諧波電流的電壓，達(dá)到有源濾波器抑制諧波的目的。
4采用滯環(huán)瞬值比較方式的直流有源
本文采用本課題組開發(fā)的電力電子電路自動(dòng)控制系統(tǒng)仿真軟件PECS來進(jìn)行仿真。該系統(tǒng)直流母線上電壓為500V左右，負(fù)載為電阻性負(fù)載，母線上電流為51A左右，控制電路中滯環(huán)比較器的環(huán)寬取輸入誤差信號(hào)（給定信號(hào)和反饋信號(hào)的差值）的5%左右。以下給出有源濾波器仿真結(jié)果。
5采用滯環(huán)瞬值比較方式的直流有源濾波
采用Tektronix公司TD340數(shù)字示波器，得到僅無源濾波器、無源加有源濾波器時(shí)的實(shí)驗(yàn)波形，分別如圖6及圖7所示。由圖可以看出，加了有源濾波器以后對(duì)消除低次諧波有明顯的作用，但是卻加大了高次諧波分量，這與仿真結(jié)果是一致的。
Omron 3G2A5-OD411
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Siemens Simatic S5 6ES5946-3UA11 6ES5 946-3UA11 E:7
INDRAMAT REXROTH KDV 1.3-100-220/300-220 Power Supply
SIEMENS SIMOREG D600/60 Mrq-GeG6V62 DC-Converter
Siemens Servomotor 1HU5044-0AC01-Z
Indramat Servomotor MAC112D-O-ED-3HC/180-A-2/SO19
SIEMENS Servomotor GL5114-0GL46-4FU7-Z GL5114-0GL46-4FU
Bosch CNC Servo Unit 047926-204401
SIEMENS AC Spindelmotor 1PH6163-4CG00-Z 1PH61634CG00-Z
Siemens SIMATIC S5 6ES5946-3UA11 6ES5 946-3UA11
REXROTH INDRAMAT MAC112C-0-KD-2-C/180-A-2/S029
INDRAMAT HDS04.2-W200N-HS56-01-FW DSS02.1M DAE02.1M
INDRAMAT MAC112C-0-HD-2-C/180-A-0/S011 Servomotor
INDRAMAT MAC112C-0-HD-2-C/130-A-1 Servomotor
INDRAMAT MAC112B-0-PD-2-C/130-A-2/S018 Servomotor
INDRAMAT MAC115B-0-DS-4-C/180-B-1/WI522LV Servomotor
INDRAMAT MAC115D-0-CS-4-C/180-A-1/WI522LV Servomotor
INDRAMAT MAC112C-0-ED-3-C/130-A-2/S013 Servomotor
Allen Bradley SLC 500 1746 1747 Komplettes Rack
Siemens Simatic S5 6ES5921-3UA12 6ES5 921-3UA12
Siemens Simatic S5 6ES5530-3LA12 6ES5 530-3LA12
Siemens Simodrive 6SN1122-0BA12-0AA0 6SN1122-0BA12-0AA0
SIMOREG D400/24 Mreq-GcG6V66-2B0 6RA2116-6DV66-0
Siemens Simatic S5 6ES5 942-7UA12 6ES5942-7UA12 sealed
INDRAMAT HDD02.2-W040N-HD12-01-FW DSS02.1M HSM01.1-FW
SIEMENS SINUMERIK 6FC5357-0BH00-0XE0 6FC5 357-0BH00
SIEMENS 6GK1141-0AA00 6GK1 141-0AA00 Communication
Siemens 6ES5946-3UA23 6ES5 946-3UA23
SIEMENS Counter Module 6ES5242-1AA32 6ES5 242-1AA32
SIEMENS WF 625 6FM1610-2CB00 6FM 1610-2CB00
DEUTRONIC Batterieladecomputer DBL 1700/3W-14E2
Siemens Simatic S7 6ES7338-7UH01-0AC0 6ES7 338-7UH01
INDRAMAT MAC112D-0-ED-3HC/180-A-2/S019 Servomotor
REXROTH INDRAMAT MHD112C-024-NG0-AN Servomotor
FANUC A350-0008-T244/06 Spindle positioning PCB
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