A speed governor parameter optimization method based on pole configuration to suppress ultra-low frequency oscillation of hydroelectric units
A technology of hydroelectric unit and optimization method, which is applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve the problems such as no optimization method of governor parameters, affecting the frequency stability of power grid, etc., and achieve suppression of ultra-low frequency oscillation. , optimize the setting, the effect of precise control effect
Active Publication Date: 2019-11-19
YUNNAN POWER GRID
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[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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[0026] 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.
[0027] 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:
[0028]
[0029] 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 syst...
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The invention discloses a speed governor parameter optimization method for suppressing ultra-low frequency oscillation of a hydro-power generating unit based on pole assignment. The method is based on the characteristic equation expression of hydro-power generating units, and finds that the root problem of ultra-low frequency oscillation lies in excessively low ratio between the scale parameter and integral parameter of the speed governor. According to the invention, the method herein configures characteristic equation poles of the hydro-power generating unit in combination with the result of mechanism analysis, such that a system meets damping ratio requirements and it is ensured that ultra-low frequency oscillation is not generated in the operation. According to the invention, the method herein obviates the need for bulk tests, performs optimization through mathematical analysis expression, can obtain precise control effects, and is suitable to be encoding realized in actual engineering.
Description
technical field [0001] The invention belongs to the technical field of power system stability control, and in particular relates to a speed governor parameter optimization method for suppressing ultra-low frequency oscillation of a hydroelectric unit based on pole configuration. 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 develo...
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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/382H02J2203/20
Inventor 陈义宣李玲芳朱欣春肖友强徐政郭相阳王国腾肖亮刑法财
Owner YUNNAN POWER GRID