DC-limiter (Chopper) (October 2012) KP-38810gb_td_dc-limiter_chopper_rev.A
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1 DC-limiter (Chopper) (October 2012) KP-38810gb_td_dc-limiter_chopper_rev.A
2 Woodward td_dc-limiter_chopper_rev.a Woodward behält sich das Recht vor, jeden beliebigen Teil dieser Publikation jederzeit zu verändern und zu aktualisieren. Alle Informationen, die durch Woodward bereitgestellt werden, wurden auf ihre Richtigkeit nach bestem Wissen geprüft. Woodward übernimmt jedoch keinerlei Haftung für die Inhalte sofern Woodward dies nicht explizit zusichert. Woodward, alle Rechte bleiben Woodward vorbehalten. 2 DC-limiter Chopper
3 td_dc-limiter_chopper_rev.a Woodward Inhalt 1. DC-limiter (Chopper) Quick User Guide (General System Outline) General structure Protection if the DC-limiter Used signs and abbreviations... 9 DC-limiter Chopper 3
4 Woodward td_dc-limiter_chopper_rev.a 4 DC-limiter Chopper
5 td_dc-limiter_chopper_rev.a Woodward 1. DC-limiter (Chopper) 1.1 Quick User Guide (General System Outline) The DC-limiter is used to convert the fed energy into heat after a specific limiting value of the dclink voltage is exceeded. A further increase of the dc-link voltage and the resulting crowbar ignition shall be prevented by this. Normally such rise of the dc-link voltage is the result of dynamic mains voltage changes, when the stored energy of the engine is partially led into the dc-link via reverse conducting diodes of the machine-side converter. The voltage controller of the line-side converter is not able to control the voltage difference of the dc-link fast enough, which might result into rise of the dc-link voltage. The DC-limiter is used in CONCYCLE Wind Power Systems. 1.2 General structure In fig. 1 the single-line diagrams of the DC-limiter are shown. In essence the DC-limiter consists of two semi-conductor fuses F 1 and F 2 for protecting the DC-limiter during faulty conditions, one damping resistor R, balancing resistors R n in the individual phase branches of the DC-limiter as well as additional dc-link capacitors C ZK_Chopper (in cases where the DC-limiter is not directly connected with the dc-link of the IGBT converter) and IGBT modules according to the rated energy quantity. R U ZK+ V n R n V n+1 R n+1 Current supervision C ZK C ZK_Chopper V n V n+1 U ZK- F 1 R Fourfold DC-limiter with Infineon-module n: =1...4 U ZK+ V n R n V n+1 R n+1 Twofold DC-Limiter with Infineon-module C ZK U ZK- C ZK_Chopper F 2 V n+1 V n n: =1...2 U ZK+ C ZK F 1 R F 2 Single DC-limiter with Semikron module U ZK- Fig. 1: Single-line diagram of the DC-limiter DC-limiter Chopper 5
6 Woodward td_dc-limiter_chopper_rev.a Normally the dc-link voltage at the converter is 1100V, but at times this value can be exceeded during mains failures. In order to prevent an additional rise of the dc-link voltage, the IGBTs are controlled by a voltage measuring module (GM2), made by Woodward SEG, so that the energy in the dc-link capacitor bank can be discharged via power resistors. As soon as the dc-link voltage has undershot a specific value, the IGBTs are switched off. The oscillating circuit between the DClimiter and the dc-link capacitor of the converter is dampened by the damping resistor R. 6 DC-limiter Chopper
7 td_dc-limiter_chopper_rev.a Woodward 1.3 Protection if the DC-limiter Overload protection by means of Energy Counter: The voltage measuring module (GM2) contains a function block (energy counter), accumulating the impulse time of the control signal. When in coordination with the load resistor this time has reached a defined max. value (t), the limiter is switched off by the GM2. When the chopper is switched off, the time is only reset after a cooling-down period of 10 minutes. If during this time the chopper is loaded again, it is only activated for the time already decremented. U Crowbar_on U-DC U limiter_on U limiter_off U DC Nom E max [kws] DC-Limiter on E(t) DC-Limiter on DC-limiter switch off by under-run the cut-off threshold value DC-Limiter switch off by reaching the max. energy quantity Time Overload protection by means of fuses: In each of the two paths of the duplex chopper load circuit a fuse is provided and rated for the applying load. The quad chopper is protected by means of a current supervision, rated for the applying current values i.e. if the DC-limiter is not controlled and current is measured as result of a defect, the system is shut-down. Overload protection by means of Temperature: On the resistor a thermostat is fitted as further protection which actuates a tripping device at overtemperature and shuts-down the complete system. DC-limiter Chopper 7
8 Woodward td_dc-limiter_chopper_rev.a Temperaturüberwachung The above pictures are examples of unit packages/components showing where the outlined jobs have to be carried out. Example: Voltage- / current shape during activation kv ka ms 8 DC-limiter Chopper
9 td_dc-limiter_chopper_rev.a Woodward 2. Used signs and abbreviations A B C D E F G H I IGBT J K L M N O P Q R S T U V W X Y Z Insolated Gate Bipolar Transistor DC-limiter Chopper 9
10 Woodward td_dc-limiter_chopper_rev.a Woodward Kempen GmbH Krefelder Weg 47 D Kempen (Germany) Postfach (P.O.Box) D Kempen (Germany) Phone: +49 (0) Internet Homepage Sales Phone: +49 (0) Telefax: +49 (0) Service Phone: +49 (0) /398 Telefax: +49 (0) kempen-service@woodward.com 10 DC-limiter Chopper
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T j = 150 C T s =70 C 371 A V CC = 1000 V I C =420A. I C =420A T j =25 C V V GE =15V chiplevel. T j =150 C
SKiM 93 Trench IGBT Modules SKiM429GD17E4HD Features IGBT 4 Trench Gate Technology Solderless sinter technology V CE(sat) with positive temperature coefficient Low inductance case Insulated by Al 2 O 3
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Soft Switching Series
Reverse Conducting IGBT with monolithic body diode Features: 1.5V Forward voltage of monolithic body Diode Full Current Rating of monolithic body Diode Specified for T Jmax = 175 C Trench and Fieldstop
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IKW40N120T2 TrenchStop 2 nd Generation Series
Low Loss DuoPack : IGBT in 2 nd generation TrenchStop with soft, fast recovery antiparallel Emitter Controlled Diode Best in class TO247 Short circuit withstand time 10 s Designed for : Frequency Converters