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Hyposynchronous damped control system

A damping control and sub-synchronization technology, applied in control systems, control generators, AC network circuits, etc., can solve multiple torsional vibration modal design control channels and parameters, the operation mode of the unit has great influence, and the control effect is not ideal To achieve the effect of reducing torsional vibration fatigue loss of shafting, solving multi-mode subsynchronous resonance and oscillation problems, and improving subsynchronous stability

Inactive Publication Date: 2008-12-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) When using a single speed feedback, only one mode can be effectively suppressed, and the problem of multi-mode SSR / SSO can not be solved well; if the voltage or current control loop is added to make it have multi-mode SSR suppression ability, the control effect is not good Ideal and greatly affected by the operating mode of the unit
[0008] (2) The structure of SSDC controller is mostly simple proportional-integral (PI, Proportional-Integral) or proportional-integral-differential (PID, Proportional-Integral-Differential) control, and the control parameter design is difficult to take into account multiple modal control effects and Adapt to changes in operation mode, resulting in poor actual control effect
[0009] (3) Different control channels and parameters are not designed for multiple torsional vibration modes, and decoupling control is performed. The mutual interference between torsional vibration modes is serious, and it is difficult to achieve the effect of simultaneously optimizing and suppressing multiple torsional vibration modes

Method used

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Examples

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Embodiment 1

[0031] see figure 1 , the embodiment of the present invention provides a sub-synchronous damping control system, which specifically includes: a rotational speed detection and pre-processor 101, a combined modal filter 102, a combined proportional phase shifter 103, and a modal control signal synthesizer 104 , the nonlinear converter 105 .

[0032] Wherein, the rotational speed detection and the pre-processor 101 specifically include:

[0033] The speed sensor 1011 is used to detect the speed signal at the shaft end of the turbogenerator to obtain the speed ω, and divide the detected speed ω by the rated speed ω 0 Carry out standardization to obtain the standardized value, then subtract the rated speed per unit value 1.0 from the normalized value to obtain the shafting speed deviation value, and use the shafting speed deviation value as the value to suppress subsynchronous resonance and oscillation The feedback signal of the system, the shaft speed deviation value at this tim...

Embodiment 2

[0105] Such as image 3 As shown, for the transmission system with SSR / SSO risk, the subsynchronous damping control system described in Embodiment 1 above will be designed and implemented according to the following steps:

[0106] 301: SSR / SSO Feature Analysis and Evaluation

[0107] On-site measurement of the characteristic parameters of the torsional vibration of the turbogenerator shafting with SSR / SSO risk. The modeling of the transmission system and the nonlinear electromagnetic transient system; the SSR / SSO characteristics of the transmission system are evaluated by using the method of eigenvalue analysis and time domain simulation, and the subsynchronous torsional vibration modes that need to be focused on are determined.

[0108] 302: Offline Parameter Design of Subsynchronous Damping Control System

[0109] For the subsynchronous torsional vibration modes determined in 301 that need to be focused on, first determine the filters of the subsynchronous damping control ...

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Abstract

The invention discloses a subsynchronous damping control system, and belongs to the power system stabilization and control technology field. The system includes a rotate speed testing and preposing processor, a combined mode filter, a combined proportion phase shifter, a mode control signal synthesizer and a nonlinear transformer. The system solves the problem of multimode subsynchronous resonance and oscillation of a power system, improves the subsynchronous stability of the power system, and reduces the shafting torsional oscillation fatigue loss of a large-size steam turbo generator.

Description

technical field [0001] The invention relates to the technical field of power system stability and control, in particular to a subsynchronous damping control system. Background technique [0002] With the increasing demand for long-distance and large-capacity transmission, especially large-scale coal power bases are far away from the load center, most of them adopt the long-distance plant-to-grid transmission mode. In order to improve the transmission capacity and system stability, more and more fixed series connections are used. Capacitor compensation (FSC, Fixed Series Compensation), high-voltage direct current transmission (HVDC, High Voltage Direct Current Transmission) and some high-speed control devices based on power electronics technology. However, these devices may cause subsynchronous resonance (SSR, Subsynchronous Resonance) or subsynchronous oscillation (SSO, Subsynchronous Oscillation) problems under certain conditions. Slight SSR / SSO will reduce the life of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/18H02P9/00
CPCY02E40/30
Inventor 谢小荣
Owner TSINGHUA UNIV
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