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A double-scale data fusion method for substation substation structure

A data fusion and substation technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the inability to guarantee the observability of the zero-impedance network of substations

Inactive Publication Date: 2017-07-14
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, due to the unique zero-impedance switching model of the substation, the distribution of PMUs is also unique. Usually, in the zero-impedance switching There is no PMU measurement on the branch
That is to say, only using PMU measurement cannot guarantee the observability of the substation zero impedance network

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  • A double-scale data fusion method for substation substation structure
  • A double-scale data fusion method for substation substation structure
  • A double-scale data fusion method for substation substation structure

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Embodiment Construction

[0057] The dual-scale data fusion method of substation variable structure proposed by the present invention is further described as follows with reference to the accompanying drawings and embodiments:

[0058] From the perspective of information fusion theory, this method selects the fusion structure and fusion criterion suitable for the substation measurement system: according to the characteristics of the measurement of different time scales, different fusion models and algorithms are selected.

[0059] Definition: The data acquisition time scale of PMU is called fine scale, and the fusion of PMU data and RTU data at the fine scale is called Fast Data Fusion (FDF); the data acquisition time scale of RTU is called coarse scale , The fusion of the coarse-scale PMU data and RTU data is called coarse-scale data fusion (Slow Data Fusion, referred to as SDF).

[0060] Due to the different measurement of the two scales defined above, different fusion models are used at the beginning of th...

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Abstract

The invention relates to a variable-structure dual-scale data fusion method for a transformer substation, and belongs to the technical field of power system operation and control. The method comprises the following steps: creating coarse and fine scale state vectors; performing fine scale data fusion on PMU (Phase Measuring Unit) and RTU (Remote Terminal Unit) node number measurement in a fine scale fusion cycle by a bus model, and creating a fine scale fusion measurement equation; giving the initial value of the fine scale state vector according to different situations; performing fine scale state estimation; creating a coarse scale fusion measurement equation until the starting moment of the coarse scale fusion cycle comes; giving the initial value of the coarse scale state vector, performing coarse scale state estimation, and transmitting a coarse scale state estimation result to a dispatching center for use by a dispatcher. According to the method, multi-source data from an RTU and a PMU in the transformer substation can be efficiently and fully utilized, bad data in the number measurement can be identified and deleted, and the robust estimation performance of state estimation of the transformer substation can be remarkably improved.

Description

Technical field [0001] The invention belongs to the technical field of power system operation and control, and particularly relates to a dual-scale data fusion method for substation variable structure. Background technique [0002] As more and more new energy sources are connected, the uncertainty of the power grid increases, and the real-time requirements for monitoring and controlling the power grid are gradually increasing. In recent years, due to the wide application of phasor measuring units (PMU) in power systems, wide area measurement systems (WAMS) have developed rapidly. PMU measurement has the advantages of fast speed, high accuracy, and good synchronization. Effective use of PMU measurement is conducive to capturing the dynamic information of the power system, improving the fault response ability of dispatchers, and better monitoring and controlling the safe and economic operation of the power system . In the field of power system state estimation, the emergence of P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 徐英孙宏斌贾琳郭庆来高洵张伯明栗向鑫吴文传张硕盛同天李轶群赵伟
Owner STATE GRID CORP OF CHINA
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