Method for identifying power oscillation of power system based on integration algorithm for moment resolution
A technology of power system and power oscillation, applied in the direction of reducing/preventing power oscillation, control system, electrical components, etc. Effect
Active Publication Date: 2012-09-26
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
Since the power system is a dynamically balanced system, it is also difficult to distinguish the normal power fluctuation and avoid the malfunction of the disturbance source location system
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[0017] In the following, the method for identifying the power oscillation of the power system caused by the generator speed control system based on the integral algorithm of torque decomposition in the present invention will be further described in detail with reference to the accompanying drawings.
[0018] The speed control system controls the movement of the steam valve or guide vane, and controls the flow of steam or water into the prime mover. The steam or water flow generates mechanical torque applied to the shaft of the generator set, which affects the operating state of the prime mover. The mechanical torque affects the movement of the generator rotor, and has an impact on the dynamic stability of the power system.
[0019] Such as figure 1 As shown, the expression of the mechanical torque increment in the Heffron-Philips model is ΔT M =-G GOV (s) Δx, for a certain oscillation frequency f, substituting s=jΩ=j2πf, we get:
[0020] ΔT M =-G GOV (s)Δx=-G GOV (jΩ)Δx=-G GOV (j...
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The invention belongs to the field of power systems, and particularly relates to an implementation method for identifying oscillation, which is triggered by a generator speed regulating system, of a power system based on an integration algorithm for moment resolution. The implementation method includes computing mechanical power deviation delta PM; determining speed deviation delta omega of the generator; and judging whether the speed regulating system of a unit provides positive damping or negative damping to a certain oscillation mode in an interconnected power grid by means of calculating quadrant of an integration value of the mechanical power deviation delta PM of the generator and the speed deviation delta omega of the generator. Fitting calculation for a regulating valve signal of the speed regulating system and an original prime mover model is carried out, and a calculation result is subtracted by an average mechanical power value of a generator to obtain the mechanical power deviation delta PM of the generator; and frequency of internal electromotive force EQ of the generator is calculated to obtain the speed deviation delta omega of the generator. The method has the advantages that measurement is convenient and accurate, whether the certain generator speed regulating system provides the positive damping or the negative damping to the certain oscillation mode can be simply and clearly identified, and accordingly measures are quickly taken to suppress oscillation caused by a speed regulator.
Description
Technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for identifying the power oscillation of the electric power system caused by a generator speed regulation system based on an integral algorithm of torque decomposition. Background technique [0002] The problem of power system oscillation is a technical problem faced by power grids at home and abroad. Active control and instant detection are the development trend of low-frequency oscillation suppression at home and abroad. At home and abroad, some attempts have been made to use the wide-area signal of the WAMS system to monitor oscillations. Domestically, systems for on-line monitoring and early warning of power system oscillations have also been developed. However, the field of disturbance source positioning research at home and abroad is in its infancy, and a complete and accurate positioning system from the cluster level to the unit control system level h...
Claims
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Inventor 李文锋李莹周孝信刘增煌陶向宇王官宏何凤军赵红光
Owner CHINA ELECTRIC POWER RES INST