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LCQ-1 digital automatic excitation regulator
Overview
The LCQ-1 automatic excitation regulator is an automatic excitation regulator based on a 32-bit high-speed digital signal processor (DSP) design. It has a simple hardware structure and rich software functions. Its basic template is a multi-purpose power electronic control And actuators, including all the necessary functions to control, limit and protect the generator from exceeding its capacity range. The user can use the host computer to carry out protocol remote communication through the RS-232 port or CAN bus. The hardware structure of the LCQ-1 automatic excitation regulator is shown in the figure below.
The block diagram of LCQ-1 digital automatic excitation regulator
Principle and typical application
LCQ-1 is a digital excitation control system that controls the output voltage and reactive power of the synchronous generator by changing or controlling the DC excitation level of the exciter field added to the generator. LCQ-1 is practically suitable for generators of any power. The following figure is a typical application block diagram of the LCQ-1 AVR.
parameter
● Control circuit voltage: 24Vdc
● Control circuit power: 12W
● 2 or 3 phase power input range: 0~220Vac±10%
● Maximum rated output current: 15Adc
● Voltage adjustment accuracy: ≤0.5%
● Low frequency (UF) or volt-hertz (V/Hz) limiter: Yes
● Excitation method: soft start
● Strong excitation output capacity: 20Adc for 1 minute, 30Adc for 10 seconds
● Reactive power adjustment: Yes
● Current detection input: ≤5Aac
● Voltage detection input: ≤24Vac
Key Technology
1, LCQ-1 type AVR can meet the requirements of single-machine operation and multi-machine parallel operation.
2, LCQ-1 type AVR can automatically and manually start, stop, soft start, and has an interface circuit with the monitoring system.
3, LCQ-1 type AVR can provide over-voltage, over-current monitoring and protection functions.
4, LCQ-1 type AVR can ensure that the generator end voltage regulation accuracy is better than 0.5%.
5, LCQ-1 type AVR can ensure that the setting range of the generator terminal voltage difference rate is ±30%, and the range is divided by 0.1%. The difference adjustment characteristic has good linearity.
6, LCQ-1 type AVR has low frequency limiter or voltage/frequency limiter function. The slope of the low frequency limiter can be adjusted between 0 and 3 pu in steps of 0.01 pu, and the corner frequency can be adjusted between 45 to 65 Hz in steps of 0.1 Hz. This function allows the LCQ-2 to precisely match the operating characteristics of the prime mover and precisely match the load of the generator.
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