Generator Differential Protection Method Based on Stator Double 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, achieve the effects of eliminating electromagnetic coupling, convenient parameter adjustment, and strong reliability
Active Publication Date: 2022-06-03
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
Method used
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[0091] The stator winding simulation model is established by PSCAD, and the fault simulation of different positions and types is carried out. The generator model is shown in Figure 8 of the accompanying drawings. Figure 8 Medium, K 1 , K 2 , K 3 is the fault point outside the area; K 4 , K 5 , K 6 is the fault point in the area; the power supply and equivalent line in the model are represented by a distributed parameter model, and the specific parameters are shown in Table (1) and Table (2).
[0092] Table 1 Main parameters of generator
[0093]
[0094] Table 2 Generator internal parameters
[0095]
[0096] The simulated fault types are single-phase grounding and two-phase short-circuit grounding. The simulation results are shown in Table 3 and Table 4, respectively. In 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 p...
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The generator differential protection method based on the stator double-layer winding model disclosed in the present invention is specifically as follows: Step 1, physical modeling, the mutual impedance between each two phases of the generator is used as the common impedance and the mutual compensation impedance between the two phases for common simulation, and the Figure out the equivalent circuit diagram of the assumption that the generator has an external fault and an internal fault, providing a theoretical basis for the subsequent effective identification of the internal and external faults involved; step 2, mathematical modeling, improved six-sequence component method, for three-phase two-phase According to the characteristics of parameter asymmetry of the two loops of the layer winding, a new method is proposed for decoupling; through reasonable decoupling, a reliable model basis is provided for the relevant research on the protection of the inner winding of the generator; step 3, after step 1 and step 2 In the built generator model, use the longitudinal impedance electrical triangle balance relationship to complete the effective identification of the faults involved in the area and outside the area. The method is more reliable, and has good phase-separation discrimination ability and higher sensitivity when an internal fault occurs.
Description
technical field [0001] The invention belongs to the field of generator relay protection, in particular to a generator differential protection method 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. With the development of the 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 variation law and magnitude of each electrical quantity after the internal fault of the generator, in order to analyze the reliability, selectivity and sensitivity of various protection schemes, and to propose new protection principles, the internal modeling of the generator is further improved. , which is of great significance to study the analysis algorithm of the internal fault of the gener...
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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