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Method for calculating differential equation of one-tube multi-machine hydroelectric generating set adjusting system

A technology for regulating systems and hydroelectric units, which is applied in calculation, computer-aided design, electrical digital data processing, etc., and can solve problems such as inconvenient torque models

Active Publication Date: 2021-04-13
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

The third model is more suitable for nonlinear analysis, but the moment model in algebraic form is not convenient when conducting control strategy research

Method used

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  • Method for calculating differential equation of one-tube multi-machine hydroelectric generating set adjusting system
  • Method for calculating differential equation of one-tube multi-machine hydroelectric generating set adjusting system
  • Method for calculating differential equation of one-tube multi-machine hydroelectric generating set adjusting system

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Embodiment Construction

[0065] The present invention will be further described below in combination with the accompanying drawings and specific embodiments.

[0066] This example is calculated based on the data of a certain hydropower station. The power station is arranged in the form of one pipe and three machines. The water hammer wave velocity in the pipe is α = 1100 (m / s). The characteristic parameters of the hydraulic system are shown in Table 1:

[0067] Table 1: Characteristic parameters of the hydraulic system

[0068]

[0069] Turbine parameters: rated flow Q r =53.5(cubic meter / second), rated water head H r =312(m), main servomotor time constant T y = 0.5 (seconds).

[0070] The turbine governor adopts step input, and the control parameter u is directly given according to the load change.

[0071] Simulation working condition: analyze the three units of the power station under the condition of load step. The duration of the experiment is 20s, which is divided into two moments. When...

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Abstract

The invention relates to a differential equation calculation method for a one-pipe multi-machine hydroelectric generating set adjusting system and belongs to the technical field of stability analysis and control of water turbines and hydroelectric generating sets. The method comprises steps of hydraulic coupling of a one-pipe multi-machine system under rigid water attack being represented by using dynamic parameters of a hydraulic system and state variables of multiple units, dynamically converting hydraulic power sharing a pipeline into a differential equation model of flow of each unit, constructing a water turbine torque differential equation model and a hydraulic speed regulation system model on the basis of the hydraulic power, and establishing a hydraulic torque differential equation model and a hydraulic speed regulation system model; wherein the generator system models jointly form a one-tube multi-machine hydroelectric generating set adjusting system differential equation model; and under the condition that multiple units act at the same time, transient changes of water heads, flow and output of all the water turbines being calculated. The method provides a convenient calculation method and means for researching the regulation performance of each water-turbine generator set and the cooperative control design among a plurality of water-turbine generator sets under the water-turbine-electricity multi-factor coupling condition.

Description

technical field [0001] The invention relates to a differential equation calculation method for a regulating system of a multi-machine hydroelectric unit with one tube, and belongs to the technical field of stability analysis and control of hydraulic turbines and hydraulic units. Background technique [0002] During the construction of hydropower stations, considering factors such as cost and geographical location, the arrangement of multiple generators in one tube is widely used. like figure 1 As shown, this type of hydropower station diverts water to the front end of the powerhouse through a shared penstock, and then connects to each hydroelectric generator set through branch pipes. When a hydropower station uses a water diversion system with a shared pipe section to supply water, the action of any governor will cause changes in the water pressure in the public pipeline, resulting in hydraulic coupling, which will affect the speed and power of other units, and cause other ...

Claims

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Application Information

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IPC IPC(8): G06F30/27G06F113/08G06F113/14G06F119/14
CPCG06F30/27G06F2113/08G06F2113/14G06F2119/14
Inventor 郭志成曾云李飞霏钱晶王芳芳邹屹东
Owner KUNMING UNIV OF SCI & TECH
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