On-line adjustment method for KAPLAN unit

Abstract

The invention provides an on-line adjustment method for a KAPLAN unit, which has the advantages that: on the basis of not changing the prior KAPLAN computer control system, an actual water head signalwhich is input into the control system is intercepted and shielded based on the prior combination relationship, while a virtual water head signal is input into the control system to form a novel combination relationship between the relative opening degrees of guide blades and blades, and outflow conditions are adjusted to achieve the aim of adjusting the flow. Therefore, the on-line adjustment method can realize the real-time adjustment of a unit system of a hydropower station by means of the prior computer control system, and also can realize various adjustment targets in real time accordingto operation conditions of the hydropower station such as water head, the flow, and the distribution of the flow among units to realize the high-efficiency and economical operation of the hydropowerstation.

Description

【Technical field】 [0001] The invention relates to a method for adjusting the working state of a water turbine unit in a hydropower station, in particular to an online adjustment method for a KAPLAN unit. 【Background technique】 [0002] Today, energy is in short supply. The depletion of non-renewable energy such as oil and coal has made people increasingly dependent on renewable energy. This is the main reason why hydropower, wind power, and solar power can flourish. Among the many renewable energy sources, hydropower is the most economical. However, people's attention often only stays in the exploration of new hydropower resources, but ignores the technical transformation of the original hydropower generation equipment to improve power generation efficiency. With the extensive development of medium and high head hydropower stations, the exploitable resources are decreasing day by day. In the past two decades, KAPLAN (rotary paddle turbine) unit-type hydropower stations w...

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Problems solved by technology

[0003] However, after the installation and overhaul of the traditional KAPLAN unit is completed, the associated relationship between the guide vane and the blade is designed and solidified. Once the hydropower station enters the water, it will no longer be able to be adjusted. The entire adjustment during the power generation process of the power station is through sensors. After sensing, it is automatically completed by the computer control system according to the established method, and the whole adjustment process cannot be intervened by the outside world. Whether it is in the initial stage of power station construction and the water abandonment period during construction, or the normal operation period after the completion of the power station, this completely depends on The automatic control method is not applicable in many cases. For example, the association relationship between the guide vane and the paddle blade will be inaccurate due to the error of the water head measurement during use. In addition, after the completion of the hydropower station, due to the complexity of the flow regime, often If the distribution of the flow into each turbine in the forebay is unbalanced, each unit will still operate according to the established association relationship, which will not only affect the output of the overall unit of the system, but also fail to maintain the maximum efficiency.

At the same time, the joint relationship between the guide vane and the blade of the hydropower station using this kind of KAPLAN unit is only combined according to the principle of maximum efficiency. In the power station, there is water abandonment, peak shaving and early installation, and the output cannot be increased, which affects the further use of hydropower resources in the power station.

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