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Method for configuring PMU taking regard of high risk cascading failure path

A cascading failure, high-risk technology, applied in emergency protection circuit devices, electrical components, information technology support systems, etc., can solve problems such as failure to consider, loss of network-wide observability, and inability to cope with the impact of multi-level cascading failures to ensure Observability, the effect of improving robustness

Inactive Publication Date: 2007-08-08
ZHEJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods do not consider the loss of observability of the entire network when the topology changes due to cascading failures and other reasons.
Although methods such as the minimum spanning tree method considering the N-1 situation can improve the robustness of the PMU system in the face of N-1 faults, the number of PMUs in these configuration schemes will reach 50% of the number of nodes in the entire network, and still Inability to deal with the effects of multi-level cascading failures

Method used

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Embodiment 1

[0071] The cascading failure simulation experiment is carried out on the IEEE39 node system, as shown in Figure 3. A total of 280*46=12880 simulation experiments were carried out, that is, 280 simulation experiments were carried out with each line in the system as the initial fault. Each time the selected line is disconnected as the trigger of cascading failures, and then the hidden fault model is used to simulate the occurrence of cascading failures. After the cascading failures are over, the path of the cascading failures and the final load loss are recorded.

[0072] Analyze the cascading faults of level 2. Arrange all cascading failure paths from left to right according to the order of risk value from small to large, and the results are shown in Figure 4. It can be seen from the figure that the risk value of a small number of 2-level cascading failure paths is much higher than that of other paths. Select the top 8 paths with the risk value in the second-level cascading f...

Embodiment 2

[0079] The three-level cascading failure path in the IEEE39 node system is analyzed below. Experimental condition is the same as embodiment 1.

[0080]Analyze 3-level cascading failures. Arrange all cascading failure paths from left to right according to the order of risk value from small to large, and the results are shown in Figure 5. It can be seen from the figure that the risk value of a small number of 3-level cascading failure paths is much higher than that of other paths. Select the top 8 paths with the highest risk value among the 3-level cascading failure paths and list them in Table 3. Analyzing the influence of level 3 cascading failures on the observability of the system, it can be seen that 6 of the first 8 paths with the highest risk value of level 3 cascading failures will lead to incomplete observability of the system, and most of the paths will lead to unobservability of more than 2 nodes in the system .

[0081] Table 33 The 8 paths with the highest risk...

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Abstract

The invention discloses one power system broad measurement system PMU device optimization method, wherein, the current method concentrated on small PMU for total observation and this invention considers the minimum generation tree method to improve PMU system robust property on N-1 false without impact on multiple linkage.

Description

technical field [0001] The invention belongs to the technical field of power system security defense, and in particular relates to a method for configuring a PMU in a power system. Background technique [0002] In recent years, many large-scale power outages have occurred around the world, which has aroused people's attention on the prevention and control of large-scale catastrophes in large-scale power systems. The wide-area measurement system (WAMS) based on the global positioning system (global positioning system, GPS) is a new technology developed in recent years. Accurately measure the bus voltage generator power angle in the network and monitor the whole network in real time. [0003] In his pioneering work, Dr. Phadke discussed the state estimation problem under the condition of measuring all node voltage phasors and measuring all or part of branch current phasors, and established a linear state estimation model. If each busbar in the power network is equipped with ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCY02E60/728Y04S10/265Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 曹一家陈晓刚王绍部
Owner ZHEJIANG UNIV
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