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YSFW125-6/560 asynchronous generator design and power plant operation


t59.8 order to avoid runaway, and network design of asynchronous generators generally have a higher overload multiple,[link widoczny dla zalogowanych], asynchronous generator overload is greater than 1.8, running on safe enough. Asynchronous Generator 125kW 3.9 times multiple of the maximum torque. And the network decided to run the induction generator voltage grid voltage, grid voltage is too high, causing magnetic saturation generator, a significant increase in the generator excitation current, the power factor decreased. If the generator at rated voltage at rated power operation, this time will cause the generator overload. Therefore, induction generator at rated voltage,[link widoczny dla zalogowanych], the motor of the magnetic flux density is not part of the design is too high. And network operation depends on the electric induction generator frequency A frequency, rotational speed does not change the generator frequency, but the change will cause the system frequency electromagnetic induction generator performance changes, reduce the frequency generator current increases,[link widoczny dla zalogowanych], the frequency will be reduced to improve the current generator, If the frequency increases a lot, it is possible to run the generator as a motor. General frequency stability of large power grid, running in a small electric Ah, the operator should pay attention to power A special cut frequency. * 28 * V, pull up sleeves and protection of trial l asynchronous generator control and protection than the synchronous generator to be simple and easy-to-oak-free operation. Luodian station network by the induction generator and generator control generator terminal http speed, tachometer generator voltage up to 63V, then the generator speed close to the 1000r/rain, that is smooth and the network. Do not detect when the grid voltage phase angle and size, so the operation is extremely simple. General small induction generator with no overvoltage protection, undervoltage, overcurrent, over the amount of rates and low frequency protection. 125kW induction generator power distribution panel is the original old distribution panel made minor improvements, over-current control loop with time delay, delay and loss of pressure over-voltage protection. Overvoltage relay setting voltage is 1.15 times the rated voltage, current relay current setting is 1.2 times the rated current, time delay relays 1.5S. Grid induction generator voltage and the amount of rates determined by the amount of grid voltage and the rate, so there is no Mai magnetic system and automatic voltage regulation device. And network operation speed and output power of induction generator operator station M-S curve, so do not have to install speed turbine clamor. VI Summary synchronous generator is the main force of hydropower equipment, but can not ignore the asynchronous generator in small and medium hydropower stations. Induction generator is simple, reliable, cheap,[link widoczny dla zalogowanych], low maintenance, easy to implement automatic control, while the disadvantage is that reactive power to be absorbed from the grid current, isolated operation more difficult, under certain conditions, induction generator can be used to obtain a more satisfactory economic and technical effect. If the requirements of automatic and remote control station, reactive power than the mountains of surplus power, after the multi-level power in multi-unit power station and a station can use one or two units asynchronous generator,[link widoczny dla zalogowanych], submersible water wheel installed on the underwater tubular generator.
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