Excitation System
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Excitation System knowledge
Excitation system of generator is the general name of the power supply which provide excitation current of synchronous generator,and its auxiliary equipment. Excitation system is commonly composed of two main parts: excitation power unit and excitation regulator. Excitation system of generator includes DC exciter, brushless exciter, AC exciter etc.
Main functions of excitation system has
1)Correspondingly adjust excitation current according to load change of generator, to maintain set value of terminal voltage;
2)Control the distribution of reactive power among each generator of parallel operation;
3)Improve static stability of generator parallel operation;
4)Improve transient stability of generator parallel operation;
5)When fault occurs inside generator,de-excitation is performed to reduce loss degree of fault;
6)Generator is carried out maximum excitation limit and minimum excitation limit according to the requirements of operation.
Product Details
TC HYDRO Quality Evaluation
Excitation system produced by TC HYDRO is used international standard, and all component are used Chinese quality brand or international brand(ABB, Siemens,Omron) ,etc.
I.Summary
The microcomputer excitation panel produced by our company is all-digital control, and the controller is used the latest high-end industrial grade single-chip microcomputer. The excitation panel has high reliability, high speed, and strong anti-interference performance. It is used large-screen LCD display,and is convenient and intuitive.
This excitation panel is suitable for synchronous generator set using static thyristor excitation method. The excitation panel has simple operating, multiple functions, and can meet the operation requirements of method for the generator isolation and grid connection. It is an ideal excitation system for small and medium-sized generating sets.
II.Main function of the system
1.At constant voltage/constant current/constant power factor, when operation mode selects function and operation mode switches ,there is no fluctuation.
2.Modify and adjust PID parameters online.
3.Modify the adjustment coefficient online.
4.Load rejection protection function. When the circuit breaker of machine end trips, the terminal voltage automatically stabilizes at the set value.
5.No-load over-voltage protection function.
6.Automatic contravariant deexcitaion function at low speed and deexcitation command.
7.Phase fault operation alarm function of excitation rectifier device
8.Forced excitation delayed limit function.
9.Over-excitation delayed limit function.
10.Low excitation transient limit function.
11.Auxiliary functions, such as software phase shift, PID adjustment, given speed adjustment and other .
12.Automatically track the grid voltage function when the grid is not connected.
13.Both-way communication function with the host computer (used RS485 interface).It can be monitored and operated locally or remotely.
14.Software and hardware anti-interference and auto-recovery function.
III.Application environment
1.The panel is installed indoor.
2.The elevation of used location≤2500m.
3.Ambient temperature: -20℃—45℃.
4.Environment relative humidity≤90%.
5.The surrounding medium do not have conductive dust, corrosive gas, and explosion hazard.
IV.Main technical parameter
1.Input parameter
a.Terminal voltage input: A,B and C three phase, rated 100V
b.Stator current input: A,B and C phase, rated value 5A.
c.Excitation current input:75mv shunt.
d.State input of terminal circuit breaker: circuit breaker auxiliary normally closed contact.
e.State input of fast-acting fuse: fast-acting fuse auxiliary normally closed contact.
2.Output parameter
a.Output pulse: can supply pulse triggered by three-phase full-control bridge rectifier circuit. The three-phase half-control/single-phase full-control/single-phase half-control bridge rectifier circuit needs to be declared when ordering.
b.Trigger output: can reliable to trigger 1000A and below thyristor.
3.Power supply parameter
A.Terminal power supply: 100VAC±20% 50Hz±3Hz
B.Back-up power supply: 220VAC/DC±20% 50Hz±2Hz
4.Index parameter
a.Voltage regulation range: 20%-130%
b.Voltage accuracy: better than 0.5%
c.Excitation voltage response time: rise is no more than 0.08 seconds, drop is no more than 0.15 seconds.
d.Frequency characteristic: for every 1% change in frequency, the voltage change of generator end does not more than 0.25% of the rated value.
e.Excitation characteristic: under no-load excitation current of 10% of the starting excitation current, it can reliably excite.
f.Deexcitation.
If the speed is lower than 35Hz, automatic contravariant deexcitaion.
g.Dynamic performance
①Stepping up from zero: adjustment time is not more than 5 seconds, overshoot is not more than 15%, and oscillations number is not more than 3 times.
②10% step response: adjustment time is not more than 3 seconds, overshoot is not more than 15%, and oscillations number is not more than 3 times.
H.Thyristor control angular resolution: 0.036°
I.Control calculation regulation speed: 1time/cycle
J.Phase shift range: fully-controlled bridge 11-135°, half-controlled bridge 11-165°.
K.Electric parameter display accuracy: 1%.
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