Novel method for researching negative-sequence and zero-sequence component electromagnetic power of hydro-generator
A technology of hydroelectric generator and electromagnetic power, which is applied in the direction of electric power measurement through current/voltage, motor generator test, and measurement of electricity, which can solve the problems of ignoring the electromagnetic power of hydroelectric generator and not being applicable to large generators, etc.
Inactive Publication Date: 2019-11-05
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0003] At present, the calculation of the electromagnetic power of the hydro-generator is generally based on the electromagnetic power generated by the positive-sequence component of the hydro-generator, ignoring the electromagnetic power generated by the negative-sequence and zero-sequence components of the hydro-generator
Moreover, the existing literature only analyzes the constant component and the second harmonic component of the electromagnetic power generated by the equivalent circuit of the hydro-generator under the condition that there is no neutral point connection, and ignores the zero-sequence component and the salient pole effect The influence has certain limitations, and cannot be applied to all occasions of practical application of large generators
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[0101] according to figure 1As shown in the flow chart, the present invention provides a novel method for studying the negative-sequence and zero-sequence component electromagnetic power of a hydroelectric generator, comprising the following steps:
[0102] Step 1: During the external asymmetric operation of the hydro-generator, three groups of symmetrical components are generated, which are positive sequence, negative sequence and zero-sequence components respectively, and the positive-sequence, negative-sequence and zero-sequence current and voltage of the turbo-generator are calculated Phasor, according to the positive sequence, negative sequence and zero sequence current and voltage phasor of the turbogenerator, determine the negative sequence current asymmetry and zero sequence current asymmetry;
[0103] Step 2: When ignoring the no-load loss, determine the electromagnetic power of the hydro-generator, calculate the electromagnetic power of the hydro-generator when there...
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The invention provides a novel method for researching negative-sequence and zero-sequence component electromagnetic power of a hydro-generator. The method comprises the steps that the positive-sequence, negative-sequence and zero-sequence current and voltage phasors of a turbo-generator are calculated, and according to the positive-sequence, negative-sequence and zero-sequence current and voltagephasors of the turbo-generator, the asymmetry degree of negative-sequence current and the asymmetry degree of zero-sequence current are determined; the electromagnetic power of the hydro-generator isdetermined, and in the presence and absence of a neutral point, the electromagnetic power of the hydro-generator is calculated respectively, meanwhile, a direct-current component and an alternating-current component are determined; super-transient impedance circuits in the longitudinal and horizontal axes are established, the asymmetry degree of zero-sequence voltage and the asymmetry degree of impedance are calculated, and the asymmetry degree of negative-sequence voltage and the asymmetry degree of impedance are calculated. The method can deeply analyze the electromagnetic power of the hydro-generator, and give the influence effects of a negative-sequence component of the hydro-generator, zero-sequence component of the hydro-generator and structure and material of the hydro-generator onthe electromagnetic power of the hydro-generator from the perspective of theoretical analysis.
Description
technical field [0001] The invention relates to the technical field of electromagnetic power of a hydraulic generator, and is a new method for studying the electromagnetic power of negative sequence and zero sequence components of a hydraulic generator. Background technique [0002] In recent years, pumped storage power plants have been widely used in power systems. The most important electrical equipment in pumped storage power plants has the function of peak regulation and valley filling. For generator run and motor run. When operating as a generator, the hydro-generator operates with an asymmetrical load. At this time, the symmetrical component method can be used to decompose the three-sequence components of the hydro-generator. The three-sequence components include positive sequence, negative sequence and zero sequence components. The value of the negative sequence component directly affects the stability of the hydroelectric generator operation. In addition, the negati...
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IPC IPC(8): G01R31/34G01R29/16G01R21/06
CPCG01R21/06G01R29/16G01R31/343
Inventor 吕品苏勋文杨莹朱显辉赵为光
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY