A small hydropower station generator excitation regulation system and method

Abstract

The present invention relates to a generator excitation adjustment system and method for a small hydropower station, which mainly includes an intelligent terminal controller, a host computer and a lower computer; the intelligent terminal controller includes an excitation controller; the upper computer includes a JACE module and a GPRS module; the lower computer Including EasyIO and two multifunctional digital smart meters; the excitation controller adjusts the current according to the adjustment instructions of the lower computer, so as to control the excitation current in a real-time closed-loop and limit the excitation current to a reasonable range, thereby controlling the generator of the small hydropower station terminal voltage. It makes the excitation adjustment process real-time and automatic. After grid connection, it adopts automatic excitation to adjust the excitation current, automatically controls the reactive voltage of small hydropower, stabilizes the voltage around the grid connection point, and reduces the impact on the grid load user voltage. .

Description

technical field [0001] The invention relates to a small hydropower station generator excitation adjustment system and an adjustment method thereof, and belongs to the technical field of grid-connected operation of distributed energy supply systems in distribution networks. Background technique [0002] Many areas in my country are rich in small hydropower resources. However, since most small hydropower stations are run-of-river hydropower stations with small installed capacity and poor adjustability, they have the characteristics of frequent power generation in high water seasons and less power generation and stop power generation in dry seasons. Uncertainty and huge fluctuations will have a huge impact on the stability of the power grid and power dispatching. The substation capacity of these hydropower stations is relatively small. Only when they are connected to 10kV, 35kV and 110kV power grids can they run stably. Therefore, the phenomenon of grid-connected power generat...

AI Technical Summary

Problems solved by technology

However, when large-scale small hydropower stations are connected to the public network, the local load is relatively small, and most of the power is sent out through the line, resulting in a series of problems such as unreasonable distribution of reactive power and high regional voltage.

[0003] To change the voltage of the regional power grid, on the one hand, the gear of the step-up transformer can be adjusted, but some step-up transformers do not support the on-load voltage regulation function, and need to be adjusted when the power is turned off

Therefore, this method has many inconveniences and cannot achieve the purpose of real-time adjustment.

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