Novel differential protection method for generator based on stator double-layer winding model
A double-layer winding and differential protection technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as large setting margins
Active Publication Date: 2021-02-05
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology
In order to improve the reliability of the improved algorithm, the ratio of the voltage fault component difference on both sides to the positive sequence series impedance of the windings on both sides is used as the braking amount of the generator protection, and the setting margin is large
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[0091] The stator winding simulation model is established by using PSCAD, and different locations and types of faults are simulated. The generator model is shown in Figure 8. Figure 8 Medium, K 1 、K 2 、K 3 is the fault point outside the zone; K 4 、K 5 、K 6 is the fault point in the area; the power supply and equivalent lines in the model are represented by the distributed parameter model, and the specific parameters are shown in Table (1) and Table (2).
[0092] Table 1 The main parameters of the generator
[0093]
[0094] Table 2 Internal parameters of the generator
[0095]
[0096] The simulated fault types are single-phase grounding and two-phase short-circuiting grounding. The simulation results are shown in Table 3 and Table 4 respectively. Table 3 and Table 4, I res is the braking amount of the traditional algorithm; K sen1 , is the sensitivity of the traditional algorithm, K sen2 is the sensitivity of the algorithm in this paper (the sensitivity is ...
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The invention discloses a novel differential protection method for a generator based on a stator double-layer winding model, and the method specifically comprises the following steps: 1, carrying outphysical modeling, taking the mutual impedance between every two phases of the generator as the common impedance, carrying out common simulation of the mutual impedance and the mutual compensation impedance between every two phases, giving an equivalent circuit diagram for supposing that the generator has an external fault and an internal fault, and thus, providing a theoretical basis for subsequent effective discrimination of related internal and external faults; 2, carrying out mathematical modeling, improving a six-sequence component method, providing a new method is provided for the characteristic of parameter asymmetry of two loops of the three-phase double-layer winding, carrying out decoupling is carried out, and through combination and decoupling, providing a reliable model basis for related research of generator internal winding protection; and 3, in the generator model built in the step 1 and the step 2, completing effective discrimination of related internal and external faults by using a longitudinal impedance electrical triangular balance relationship. The method is higher in reliability, has good split-phase discrimination capability when an internal fault occurs, andis higher in sensitivity.
Description
technical field [0001] The invention belongs to the field of generator relay protection, and in particular relates to a novel differential protection method for generators based on a stator double-layer winding model. Background technique [0002] As the source of power energy conversion, generators affect the reliability of the entire power system operation. With the development of the electric power industry, the single unit capacity of synchronous generators has been increasing, and the structure has become more complex, which puts forward higher requirements for its protection configuration. In order to deeply analyze the change law and magnitude of each electrical quantity after the internal fault of the generator, in order to analyze the reliability, selectivity, sensitivity of various protection schemes and propose new protection principles, and further improve the internal modeling of the generator , which is used to study the analysis algorithm of the internal faul...
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IPC IPC(8): H02H7/06
CPCH02H7/06Y02E60/00
Inventor 夏经德李邵卓邵文权白杰苟乐
Owner XI'AN POLYTECHNIC UNIVERSITY