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A speed governor parameter optimization method based on critical parameters to suppress ultra-low frequency oscillation of hydroelectric units

A technology of hydroelectric unit and optimization method, applied in the direction of controlling generator, reducing/preventing power oscillation, control system, etc., can solve the problem of not proposing the optimization method of governor parameters, affecting the frequency stability of power grid, etc., to suppress ultra-low frequency Oscillation, optimized tuning, simple operation effect

Active Publication Date: 2019-11-19
YUNNAN POWER GRID
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Problems solved by technology

[0005] However, the above studies did not specifically analyze the impact of the parameters of the governor of the hydroelectric unit on the ultra-low frequency oscillation. Among the two suppression methods for the ultra-low frequency oscillation, adjusting the dead zone is actually to let the hydroelectric unit withdraw from frequency regulation, which will affect the frequency stability of the power grid. The method of adjusting the parameters of the governor mainly relies on experience and exploration, and no theoretical basis for optimizing the parameters of the governor has been proposed.

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  • A speed governor parameter optimization method based on critical parameters to suppress ultra-low frequency oscillation of hydroelectric units
  • A speed governor parameter optimization method based on critical parameters to suppress ultra-low frequency oscillation of hydroelectric units
  • A speed governor parameter optimization method based on critical parameters to suppress ultra-low frequency oscillation of hydroelectric units

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[0023] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] This embodiment adopts as figure 1 The structure of the governor shown is explained, which is the PID governor structure commonly used in hydropower units at present. based on figure 1 The governor structure shown can obtain the characteristic equation corresponding to the transfer function of the entire hydroelectric unit as follows:

[0025]

[0026] In formula (1): T 4 =T y ,T 5 =T w ,T 6 =T m , K P ,K I ,K D They are the PID parameters of the governor, R is the adjustment coefficient, y is the opening of the governor, T y (unit s) is the hydraulic system time constant, T w (unit s) is the water hammer effect time constant of the turbine, T m (unit s) is the equivalent inertia time constant of all generator sets in the system...

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Abstract

The invention discloses a speed controller parameter optimization method for suppressing the ultralow-frequency oscillation of a hydropower generating set based on a critical parameter. The method discovers, based on a characteristic equation expression equation of the hydroelectric generating set, that the reason of the ultralow frequency oscillation is that the speed controller has an over-low ratio of the proportion parameter to the integral parameter. According to a mechanism analysis conclusion, the method comprises three following steps of: (1) setting the integral parameter and the differential parameter of the speed controller; (2) searching the critical proportion parameter of the speed controller; (3) optimizing the proportion parameter of the speed controller. The method can obviously suppress the ultralow-frequency oscillation by optimizing the parameter of the speed controller in the system, and is easy to operate and suitable for software offline simulation.

Description

technical field [0001] The invention belongs to the technical field of power system stability control, and in particular relates to a governor parameter optimization method for suppressing ultra-low frequency oscillation of a hydroelectric unit based on a critical parameter. Background technique [0002] China's hydropower resources rank first in the world. With the continuous increase in the development and utilization of hydropower resources, China has become the country with the largest hydropower installed capacity in the world. Compared with thermal power generation, hydropower is cleaner and more environmentally friendly, which is in line with China's national strategy for sustainable development; compared with other clean energy sources, hydropower has a lower cost and mature related technologies. The construction of large-scale hydropower units is the main form of hydropower development and utilization in my country , It is an inevitable requirement for the developmen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38H02P9/06H02P101/10
CPCH02J3/24H02J3/382H02J2203/20H02P9/06H02P2101/10
Inventor 陈义宣李玲芳朱欣春司大军徐政郭相阳王国腾肖亮刑法财
Owner YUNNAN POWER GRID
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