Method for optimizing governor parameters of large hydropower unit

A technology for hydroelectric units and governors, which is applied in the direction of circuit devices, AC network circuits, single-network parallel feeding arrangements, etc., can solve the problems of hydroelectric units with large proportions, and achieve the effect of improving the performance of primary frequency modulation

Inactive Publication Date: 2019-04-12
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

However, after Yunnan Power Grid and the main grid of South Power Grid are asynchronous, the proportion of hydropower units in Yunnan Power Grid is large, and the problem of negative damping is obvious. Due to the problem of negative damping, many ultra-low frequency oscillation accidents have been caused

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  • Method for optimizing governor parameters of large hydropower unit
  • Method for optimizing governor parameters of large hydropower unit
  • Method for optimizing governor parameters of large hydropower unit

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Embodiment 1

[0054] The main parameters of the unit: the rated power of the unit is 475MW, the rated voltage is 18KV, the rated current is 16929A, the voltage level of the power plant connected to the grid is 500KV, the rated water head is 130m, the time constant of water flow inertia is 2.82 seconds, and the moment of inertia GD2 of the generator is 150000t. m2, the shutdown time is 14.3 seconds, the startup time is 28.11 seconds, etc.

[0055] Set the K in the PID parameters of the unit speed control system parameters of a hydropower plant I =0,K D =0, gradually increase K P value, apply a load disturbance to the single unit with load system, and observe the damping of the frequency oscillation of the unit until there is an equal amplitude oscillation, such as image 3 , to get the corresponding critical oscillation amplitude K Pmax , K Pmax =7.5.

[0056] Through the critical oscillation amplitude K Pmax Get the K in the PID parameter P = 4.6.

[0057] K P , set K in the PID pa...

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Abstract

The embodiment of the present application illustrates a method for optimizing governor parameters of a large hydropower unit, the method comprises the steps of establishing a single unit load model for the unit to be optimized; calculating the rated power of the optimized unit according to the single-unit load model; at the rated power condition, adjusting the PID parameters of the system one by one to obtain the optimal parameters under stable conditions, wherein the PID parameters include: proportional gain KP, integral gain KI, and differential gain KD. The technical scheme shown in the embodiment of the present application makes the speed regulating system PID parameters of the unit to be optimized to critically stable by making full use of the unit damping coefficient, so that the PIDparameters of the speed regulation system parameters of the unit to be optimized reach critical stability. Under the condition of not providing negative damping to the system, the primary frequency modulation performance of the unit can be improved to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of power system stability control, in particular to a parameter optimization method for a speed governor of a large-scale hydroelectric unit. 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 development of China's electric power to maintain the stable operation of hy...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/40
CPCH02J3/40H02J3/48H02J2203/20
Inventor 周鑫何常胜何鑫和鹏刘明群
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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