A small and micro hydroelectric unit and its integrated control device

Abstract

The invention discloses a small and micro hydroelectric generating set and a comprehensive control device thereof which is a control device for small and micro hydroelectric stations and small-capacity generating sets. The comprehensive control device comprises a CPU (central processing unit), an analog channel circuit unit, an AC voltage and current acquisition circuit unit, a pulse circuit unit, an I / O unit and a power supply unit, wherein the analog channel circuit unit, the AC voltage and current acquisition circuit unit, the pulse circuit unit, the I / O unit and the power supply unit are connected with the CPU; the analog channel circuit unit is connected with the pulse circuit unit; and the analog channel circuit unit is mainly composed of an analog PID circuit, a control voltage amplitude limiting circuit and a pulse generating circuit. As for small and micro hydroelectric 300kW or below generating sets, the device is additionally provided with an analog excitation channel, and a digital / analog dual-channel exciting redundant hot standby structure is formed, the excitation control reliability of the device is greatly improved, synchronized grid-connection and relay protection functions are integrated, the power generating efficiency and the power supply flexibility are improved, the number of devices is reduced, and the maintenance workload is reduced.

Description

technical field [0001] The invention relates to a small and micro hydroelectric unit and its comprehensive control device, in particular to a small and micro hydroelectric unit and its comprehensive control device with the functions of synchronous generator excitation control, grid connection and protection. Background technique [0002] In China, there are many small and micro hydropower stations. Most of these small and micro hydropower stations have a stand-alone capacity of ≤300kW. Although the stand-alone capacity is small, they have a large number and a wide distribution area, and they are one of the power sources of the power grid. Due to the low unit capacity of small and micro hydropower stations, the construction and operation costs per unit installed capacity are generally high. Most of the auxiliary equipment of small and micro hydropower units adopts a discrete structure, that is, equipment such as excitation, grid connection and protection operate independently...

AI Technical Summary

Problems solved by technology

However, this utility model cannot form a working mode of digital / analog dual-channel excitation, so it cannot better improve the reliability of excitation control, and at the same time, this utility model cannot effectively realize generator grid connection and protection functions

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