A Filter Compensation Method for Improving the Data Reliability of Sampling Values in Smart Substations
A technology of intelligent substation and compensation method, applied in the field of power transmission and transformation, can solve the lack of understanding of the importance of digital filtering, failure to consider filter characteristics and protection, association of measurement and control types, abnormal processing of sampling values, improper pre-processing of filtering, etc. problems, to achieve the effect of ensuring smooth and safe operation, eliminating the influence of frequency aliasing, and clear program framework
Active Publication Date: 2019-07-23
BEIJING SIFANG JIBAO AUTOMATION
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[0003] However, in the existing relay protection equipment, there is a lack of understanding of the importance of digital filtering, and the relationship between filter characteristics and protection, measurement and control types is not considered. The abnormal processing of sampling values is not properly processed before filtering, and the resulting problems frequently occur on site. Faults, filter compensation for abnormal points become a necessary part of device development
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[0019] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings of the specification.
[0020] figure 1 It is a schematic diagram of sampled value data queue conversion relationship, showing the relationship between data queue and data processing process. figure 2 In order to improve the reliability of the SV data of the smart substation, the filter compensation method disclosed in this application includes the following steps:
[0021] Step 1: The digital secondary device receives the sampled value SV message uploaded by the merging unit via the optical fiber Ethernet. The data processing program needs to process a large number of messages, and it needs to provide real-time data for the relay protection module or measurement control module, while taking into account the memory usage. The original queue of sample values can be set to half-cycle or full-cycle data length. This embodiment The middle qu...
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The invention provides a filtering compensation method for improving data reliability of a sampling value (SV) of an intelligent transformer station. According to the method, simple parabola interpolation abnormal point compensation for a sampling value original queue is carried out, the qualified data is provided for a filter, and influence of abnormal points on protection is reduced; when the inputted SV data has no abnormal points, digital filtering is directly carried out; when the quantity of abnormal points of the inputted SV data is not greater than 3, after compensation processing on the abnormal points, digital filtering is carried out; when the quantity of the abnormal points of the inputted SV data is greater than 3, the filter withdraws, interpolation queue data zero clearing is carried out, state setting is ineffective, and protection is in short period locking; when the quantity of effective points satisfies requirements of a filtering input sequence, digital filtering restarts. The process realizes stable transition, and a protection function is not influenced; different filter models are selected according to protection characteristics, and requirements of protection in different types for harmonic waves can be satisfied. The method is advantaged in that massive optimization is carried out, the method is suitable for being used on embedded chips, and the method can be directly applied to a digital relay protection device.
Description
Technical field [0001] The invention belongs to the technical field of power transmission and transformation, and particularly relates to a filtering compensation method in the data processing link of a sampled value message (ie SV) of a smart substation. Background technique [0002] The substation is an indispensable and important link in the power system. It is responsible for the heavy tasks of power conversion and power redistribution, and plays a pivotal role in the safety and economic operation of the power grid. In the smart substation, the merging unit receives the electronic transformer or the analog quantity self-collected by the merging unit, and transmits the sampled value SV message to the protection, measurement and control, PMU and other bay layer devices through the optical fiber Ethernet. In order to meet the requirements of different equipment for sampling values, the merging unit uses a higher sampling rate, 80 points per week, and the interval layer equipment...
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IPC IPC(8): H02J3/01H02H7/22
CPCH02H7/22H02J3/01Y02E40/40
Inventor 杜振华王志华赵靖王双剑董志平许翠娟程文雁
Owner BEIJING SIFANG JIBAO AUTOMATION