Speed controller parameter optimization method in consideration of primary frequency modulation and ultralow-frequency oscillation suppression

An optimization method and governor technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, circuit devices, etc., can solve the problem of reducing the primary frequency modulation performance of the speed regulating system, the difficulty of operating personnel in the power grid with a high proportion of hydropower, and difficulty in taking care of it, etc. question

Active Publication Date: 2018-03-13
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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  • Abstract
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Problems solved by technology

The research shows that reducing the PID controller parameters of the governor can help improve the damping level of the governor system, but it will obviously reduce the primary frequency regulation performance of the governor system
For power grids with a high proportion of hydropower that have been transformed from synchronous networking to asynchronous networking, in order to prevent the occurrence of ultra-low frequency oscillations, it is necessary to modify and optimize the control mode and parameters of the speed control system. The two contradictory goals of primary frequency modulation performance and ultra-low frequency oscillation suppression Medium balance, difficult to balance
However, there is currently no technical method that can balance the primary frequency regulation performance and damping level of the governor, which brings great difficulties to the operators of the power grid with a high proportion of hydropower

Method used

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  • Speed controller parameter optimization method in consideration of primary frequency modulation and ultralow-frequency oscillation suppression
  • Speed controller parameter optimization method in consideration of primary frequency modulation and ultralow-frequency oscillation suppression
  • Speed controller parameter optimization method in consideration of primary frequency modulation and ultralow-frequency oscillation suppression

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Embodiment

[0066] The present invention provides a speed governor PID parameter optimization method that takes into account both primary frequency modulation performance and ultra-low frequency oscillation suppression, including the following steps:

[0067] 1) Establish a model including speed control system and prime mover, such as figure 1 shown. Taking the turbine generator of an actual hydropower station as an example,

[0068] 1-1), the block diagram of the governor PID controller model is as follows figure 2 Shown, where, s is the Lagrangian operator, K p 、K i 、K d are the PID parameters of the governor, T d is the time constant of the differential link, b p is the permanent slip coefficient, Δω is the speed deviation, Y PID Output the opening value for the PID controller. The additional adjustment mode is the opening mode, and the power / opening deviation signal access point is before the integral item, such as Figure 7-1 , Figure 7-2 As shown, the governor PID contro...

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Abstract

The invention discloses a speed controller parameter optimization method in consideration of primary frequency modulation and ultralow-frequency oscillation suppression. According to the method, a single machine infinite system containing an optimized unit and an equivalent infinite power supply is established, a comprehensive optimized index function is established under the stimulation of frequency step signals of the primary frequency modulation test requirement by regarding the unit openness/power response curve rise time, stabilization time and reverse regulation power as performance indexes of primary frequency modulation and regarding damping torque coefficients of a speed controller and a water turbine system in an ultralow frequency band as ultralow-frequency oscillation damping performance indexes, the primary frequency modulation performance and the damping level can be considered by obtained speed controller parameters, and technical means is provided for optimization of the speed controller parameters and suppression of ultralow-frequency oscillation.

Description

technical field [0001] The invention relates to the technical field of adjustment of a synchronous generator speed control system, in particular to a parameter optimization method of a speed governor taking into account both primary frequency modulation and ultra-low frequency oscillation suppression. Background technique [0002] The basic task of the governor is to automatically adjust the mechanical power output of the prime mover and change the output power of the generator according to the change of the grid frequency or load, so that the system can restore the active power balance, that is, participate in the primary frequency regulation of the system. Whether the control parameters of the governor are properly selected directly determines the quality of the regulating performance of the governor. Unreasonable parameter selection will lead to poor performance of the governor, limit its primary frequency regulation ability, and cause serious safety problems. [0003] M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/48H02J3/34
CPCH02J3/24H02J3/34H02J3/48H02J2203/20
Inventor 史华勃陈刚丁理杰张华唐伦周波刘畅
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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