Excitation System

All parts of the excitation system can achieve intelligent detection, intelligent display, intelligent control and intelligent information transmission. It also fully integrates EMC design and carefully selects low-power, high-quality industrial-grade integrated circuit chips to further improve the reliability and technical level of the excitation device.

Features

1. The central control unit of EXC9100 all-digital excitation system adopts the streamlined circuit construction with mainstream ARM + new FPGA chip as its core.
2. Adopting IEEE PSS-2Aaccelerating Power System Stabilizer with standard transfer function.
3. Current equalizing technology of intelligent power converter.
4. The CAN BUS technique.
5. Configuration Programming.
6. Intelligent Control Technology.
7. All-digital system.
8. Perfect friendly HMI.
9. various outlet interface.
10. Comprehensive debugging software.
11. good electromagnetic compatibility.
12. Completely independent microcomputer/analogue three-channel and two-module with redundancy configuration.
13. Multi-CPU mode,SMT and no-fan configuration is adopted in the regulator.
14. multi-course 3-dimentioned Chinese display.
15. Advanced and reliable core control device.
16. High-speed AC sampling technique
17. Independent and intelligent detection system and perfect fault detection function.
18. the high-frequency pulse train trigger technology, low residual fast Field flashing technology.
19. Intelligent power cabinet.
20. Current equalizing technology of intelligent power converter.
21. The high-voltage pulse transformer.
22. Powerful fans stop running ability.
23. Unique SCR jumper.
24. Improve communication function.
25. Intelligent commissioning.

Technical Parameters

No.	Content	Provision	Performance
1	Regulators performance indicators	Force-excitation ceiling voltage and time	100MW steam turbine:1.8 times of the rated voltage. 50MW turbine : 2 times of the rated voltage. The duration of not less than 10S. Ceiling voltage is calculated as 80% of the terminal voltage.
		Voltage response time	Less than 0.1S
		The accuracy of the regulator	Less than ± 0.5%
		Droop Range	Not less than ± 15%
		Frequency and voltage droop change	When the frequency change of 1%, the voltage variation is not greater than ± 0.25% of rated
		10% phase step in the condition of no load	Voltage overshoot amount of not more than 50% of the step, the oscillation is not more than 3 times, settling time is not greater than 10S
		Excitation field-flashing	Voltage overshoot is not more than 15% of rated voltage, the oscillation is not more than 3 times, the adjustment time is not greater than 10S
		Rated load rejection	Voltage overshoot is not more than 15% of rated voltage, the oscillation is not more than 3 times, the adjustment time is not greater than 10S
		The adjustment range	AVR:70% to 110% rated voltage FCRl: 20% no-load excitation current to 110% therated excitation current
		Given speed	0.3%~1%/S
		Nominal response	More than 50MW turbine and steam turbine 100MW of not less than two times per second rated excitation voltage, and the rest of not less than 1 times per second rated excitation voltage
		The generator static voltage droop	Not more than ± 1%
2	The rectifier bridge	Current coefficient	Not less than 0.85
		Rectifier redundancy	N-1
		The maximum instantaneous value of the output voltage of the rectifier	1.1 times the rated excitation current, shall not exceed the amplitude of the voltage-to-ground voltage of 30%.
3	Inversion and overvoltage protection	Deexcitation overvoltage	Shall not be less than the factory test voltage to ground voltage amplitude of 30%, shall not exceed 50%.
		ZNO	Chargeability of less than 60%, 20% of the capacity margin.
4	Power supply	Operating frequency range	45~82.5Hz
		AC380V/220	+10%~-15%
		DC220V/110V	-15%~+10%
5	System	Forced removal rate of excitation system	Not more than 0.2%

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