System and method for generator excitation adjustment of small hydropower station

Abstract

The invention relates to a system and a method for the generator excitation adjustment of a small hydropower station. The system mainly comprises an intelligent terminal controller, an upper computer and a lower computer, wherein the intelligent terminal controller comprises an excitation controller; the upper computer comprises a JACE module and a GPRS module; the lower computer comprises an EasyIO and two multifunctional digital intelligent electric meters; the excitation controller is used for adjusting a current according to the adjustment instruction of the lower computer, thus carrying out real-time closed-loop control on the excitation current, and the excitation current is limited in a reasonable range, thus controlling the generator end voltage of the small hydropower station. According to the system and the method, an excitation adjustment process realizes real-time transformation and automation, the excitation current is adjusted in an automatic excitation manner after grid connection, the reactive voltage of the small hydropower station is automatically controlled, and the surrounding voltages of grid connection points are stabilized, thus reducing influence on a power grid load and a 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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