A power grid out-of-synchronization decoupling control system and method

Abstract

The invention relates to a power grid out-of-synchronization decoupling control system and method, belonging to the field of power system stability control. The invention starts with the out-of-step judgment of the regional power grid, and judges the out-of-synchronization phenomenon of the local power grid step by step, and considers more comprehensively. On the basis of the out-of-synchronization judgment of the power grid, the influence of the out-of-synchronization of the local power grid is considered to reduce the possibility of a power outage in the local power grid; The decoupling operation is performed on the line where it is located; the present invention quickly decouples the power grid before a very serious out-of-synchronization oscillation occurs in the system, and satisfies the need to quickly and reasonably take decoupling measures in the first cycle of out-of-synchronization, and avoid out-of-synchronization faults from spreading to the entire power grid ;By introducing wide-area measurement technology, using PMU device, real-time online measurement of electrical data of the power grid, and communication through optical fiber communication technology, the main network control center can judge the out-of-synchronization of the power grid and control the entire power grid to ensure reliable de-coupling of the power grid when out-of-synchronization .

Description

technical field [0001] The invention belongs to the field of power system stability control, and in particular relates to a power grid out-of-step splitting control system and method. Background technique [0002] The power system has entered the era of large power grids, high voltage and large units. With the strengthening of society's dependence on power resources, the power system has become increasingly large and complex. The development of power systems is facing opportunities and challenges. The safety of large power systems The requirements for stable operation are getting higher and higher. Several major power outages over the years have shown that ensuring the safe and stable operation of the power system and preventing large-scale power outages is an urgent and important task for the modern power system. Losses caused by power outages require effective judgment of the out-of-synchronization situation of the system, and decoupling measures should be taken for the ou...

AI Technical Summary

Problems solved by technology

At present, a large part of the reason for the occurrence of large-scale blackouts is the improper configuration of the third line of defense, which cannot effectively judge the out-of-synchronization situation of the system, and cannot accurately locate the line where the oscillation center is located, so the research is applicable to large-scale In large-scale interconnected power systems, an accurate and fast out-of-step and decoupling judgment method has great practical significance; there are four main types of out-of-synchronization and decoupling criteria: the first category is to directly measure the voltage phase angle difference at both ends of the tie line The second category is the criterion that indirectly reflects the power angle; the third category is the out-of-step criterion using the equal-area rule; the fourth category is the composite criterion formed by combining the advantages of each criterion;

[0004] The first type of criterion requires high measurement accuracy and there is a problem of communication delay, which is only valid when the oscillation center is located between the two busbars; the second type of criterion can only be judged when the system grid is obviously out of step, and cannot Satisfy the requirements of fast decoupling of some power grids; the third type of criterion is relatively large for the sending-end system and relatively weak for the receiving-end system, a large disturbance may cause a serious drop in the voltage of the receiving-end system, if the drop in the opposite-end voltage is not taken into account , the equal-area criterion may produce certain errors; the fourth type of criterion is a major challenge for current research on how to better combine the advantages of each criterion to construct a new composite out-of-step separation criterion;

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