CN-119962228-B - Spare power automatic switching test method and system for simulating working condition of power system

CN119962228BCN 119962228 BCN119962228 BCN 119962228BCN-119962228-B

Abstract

The invention relates to the field of power system testing, in particular to a spare power automatic switching test method and system for simulating working conditions of a power system. The method comprises the following steps of S1, collecting operation parameter data of the spare power automatic switching device through a data acquisition system under high altitude and low air pressure, and carrying out strict data cleaning, feature extraction and standardization processing by utilizing a Z-score method, wherein the operation parameter data is divided into key feature data and auxiliary feature data, and the key feature data refers to parameters directly related to faults caused by viscosity change of lubricating oil. According to the invention, through comprehensive data acquisition and preprocessing, the viscosity change of the lubricating oil in the high-altitude and low-pressure environment is accurately modeled, a multi-layer simulation test model is constructed, a data selection and dynamic adjustment mechanism is optimized, the performance evaluation and fault prediction capability of the spare power automatic switching device is remarkably improved, the fault risk is reduced, the safe and stable operation of the power system is ensured, and the reliability of the system is enhanced.

Inventors

Song Daijie
TIAN WENFU
LIU WENWU
WEI NI
TIAN SHUANGSHUANG
LI YANG
PEI TAO
XU KAILUN
Leng Jixiang
WANG KANG
LIU XIANGWEI
XU JUN

Assignees

山东华信电气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250121

Claims (4)

1. A spare power automatic switching test method for simulating working conditions of an electric power system is characterized by comprising the following steps of: S1, collecting operation parameter data of a spare power automatic switching device through a data acquisition system under high altitude and low air pressure environment, and carrying out strict data cleaning, feature extraction and standardization processing by utilizing a Z-score method, wherein the operation parameter data is divided into key feature data and auxiliary feature data, and comprises the steps of firstly, determining a key feature data set by calculating the correlation between each feature and the viscosity change of lubricating oil , ; Wherein, the As a set of key feature data, As a parameter of the viscosity change of the lubricating oil, Is characterized by Viscosity variation parameter of lubricating oil The pearson correlation coefficient between them, For a set correlation threshold value, assist feature data set The determination is made as to whether the following, ; Wherein, the In order to assist in the feature data set, To remove the remaining features after the key features from all operating parameter data sets, Is characterized by And fault labels The pearson correlation coefficient between them, A set fault correlation threshold; the key characteristic data refers to parameters directly related to faults caused by viscosity change of lubricating oil, namely response delay and sensitivity reduction of the spare power automatic switching device; the auxiliary characteristic data are factors for covering up faults caused by viscosity change of the lubricating oil, namely environmental temperature fluctuation data and electric load change data; the method comprises the steps of S2, using a mathematical model and a simulation tool, calculating the viscosity change range of the lubricating oil of the spare automatic switching device under the high altitude and low air pressure environment based on an air pressure altitude change formula and a viscosity change formula, defining the viscosity change range as a viscosity reference range, selecting a data sample close to a fault point from auxiliary characteristic data through a data analysis algorithm, and comparing the data sample with key characteristic data, wherein the step of preliminarily screening the relation between the fault of the spare automatic switching device and the viscosity change of the lubricating oil through linear correlation analysis is defined as a first relation; S3, constructing a multi-layer simulation test model, wherein the multi-layer simulation test model comprises a reference layer, a feature selection layer and a simulation layer, and the multi-layer simulation test model comprises the steps of acquiring a comparison result of auxiliary feature data in a third relation and key feature data which do not accord with the faults of the automatic backup power switching device in a first relation, dynamically adjusting a viscosity reference interval if the comparison result shows that the auxiliary feature data covers the faults of the automatic backup power switching device caused by the viscosity change of lubricating oil, and extracting the viscosity change interval of the lubricating oil as a first reduced range of the viscosity reference interval; obtaining a comparison result of auxiliary characteristic data in a second relation and key characteristic data conforming to faults of the automatic backup switching device in a first relation, dynamically adjusting a viscosity reference interval to extract a first expansion range of the viscosity reference interval if the comparison result shows that the auxiliary characteristic data does not mask the faults of the automatic backup switching device caused by the viscosity change of lubricating oil, wherein the dynamic viscosity reference interval comprises the auxiliary characteristic data in a first reduction range and a first expansion range as first simulation data for simulating working conditions of an electric power system, the key characteristic data in the first reduction range and the first expansion range as second simulation data for simulating the working conditions of the electric power system, the auxiliary characteristic data in the first reduction range and the auxiliary characteristic data in the first expansion range are selected, the auxiliary characteristic data in the first reduction range continuously appear if the auxiliary characteristic data in the first expansion range intermittently appear, the auxiliary characteristic data in the first expansion range is selected as first simulation data, the auxiliary characteristic data with fluctuation degree similar to the viscosity of the lubricating oil in the residual auxiliary characteristic data is selected as partial data in the auxiliary characteristic data set, the reference layer defines a viscosity reference interval, the characteristic selection layer is used for selecting representative auxiliary characteristic data samples, and the simulation layer is used for realizing systematic comparison of extracted data and key characteristic data through computer simulation and numerical simulation and evaluating differences and reasons behind the extracted data and the key characteristic data.
2. The spare power automatic switching test method for simulating the working condition of the power system according to claim 1 is characterized in that the data acquisition system is used for collecting operation parameter data of the spare power automatic switching device in a high-altitude and low-pressure environment and performing strict data cleaning, feature extraction and standardization processing by utilizing a Z-score method, wherein the method comprises the steps of collecting operation parameter data of the spare power automatic switching device in different altitudes and air pressure environments, extracting lubricating oil viscosity change data and spare power automatic switching device fault data, analyzing the severity of the spare power automatic switching device fault data and the fluctuation degree of the lubricating oil viscosity change data based on a ridge regression algorithm, and obtaining the relation between the spare power automatic switching device faults and lubricating oil viscosity change in different altitudes and air pressure environments.
3. The method for testing the spare power automatic switching device for simulating the working condition of the power system according to claim 1, wherein the method for calculating the viscosity change range of the lubricating oil of the spare power automatic switching device in the high-altitude and low-air-pressure environment based on the altitude change formula and the viscosity change formula is defined as a viscosity reference interval, and comprises the following steps: The air pressure value is obtained by using an air pressure change formula along with the altitude, the viscosity change range of the lubricating oil is obtained by using a viscosity change formula, the air pressure change formula along with the altitude is as follows, ; Wherein, the In order to calculate the value of the air pressure, In order to be at the altitude of the sea, The molecular weight of the air is used for the purpose of adjusting the air, The acceleration of the gravity is that, Is sea level temperature; the viscosity change range of the lubricating oil is obtained by using a viscosity change formula, which comprises the following steps of, ; Wherein, the At the temperature of lubricating oil And air pressure The viscosity of the mixture is lower than that of the mixture, As a pre-exponential factor of the number, In order for the activation energy to be sufficient, As a result of the ideal gas constant, The temperature is set to be the absolute temperature, For the current air pressure to be the current air pressure, As a reference to the air pressure of the air, Is an empirical constant and depends on the type of lubricating oil.
4. A spare power automatic switching test system for simulating working conditions of an electric power system, which is used for the spare power automatic switching test method for simulating working conditions of the electric power system according to any one of claims 1-3, and is characterized by comprising the following steps: The data acquisition and preprocessing module is used for collecting high-altitude operation parameters, classifying and marking key and auxiliary characteristic data; The mathematical modeling and data analysis module is used for calculating the viscosity change range, defining a reference interval and analyzing a fault sample; The relation analysis and comparison module is used for analyzing three relations, comparing and selecting proper characteristics and optimizing simulation data; the system comprises a multi-layer simulation test model construction module, a dynamic adjustment and verification module, a viscosity reference interval dynamic adjustment module and an actual working condition adaptability optimization module, wherein the multi-layer simulation test model construction module is used for constructing a three-layer model, evaluating differences and optimizing first simulation data selection.

Description

Spare power automatic switching test method and system for simulating working condition of power system Technical Field The invention relates to the field of power system testing, in particular to a spare power automatic switching test method and system for simulating working conditions of a power system. Background In modern power systems, a backup power automatic switching device is a key device for guaranteeing power supply continuity. With the expansion of the scale and the increase of the complexity of the power system, the performance requirements on the spare power automatic switching device are increasingly improved especially in extreme environments (such as high altitude and low air pressure areas). However, current testing for a backup power automatic switching device faces a number of challenges: 1. the special environment has poor adaptability, and the traditional testing method is mainly concentrated under the conventional working condition, and cannot fully consider the influence of extreme environments such as high altitude, low air pressure and the like on the performance of the spare power automatic switching device. 2. The physical model construction is complex, and a large number of electrical equipment connections are needed to construct the physical model similar to an actual power system, such as a plurality of actual power supplies, circuit breakers, relays and complex secondary control loops. The construction process is time-consuming and labor-consuming, wiring errors are easily caused by human negligence, and the accuracy and repeatability of the test are seriously affected, especially when the high-altitude and low-air-pressure environment is simulated. 3. The parameter adjustment is inconvenient, namely, the performance of the spare power automatic switching device needs to be comprehensively evaluated to simulate various fault conditions and operation conditions, including voltage drop, frequency change, phase difference and different types of fault modes. However, under the high altitude and low air pressure environment, the existing test means are difficult to accurately adjust the parameters, so that the spare power automatic switching device cannot be tested efficiently and comprehensively. 4. The integrated test equipment is lacking, namely the integrated test equipment special for the spare power automatic switching device is lacking in the market, and the integrated test equipment is particularly insufficient in extreme environments. The existing test equipment can only test a single function or needs to be matched with other instruments, so that the test process is complicated, the data compatibility and the synchronism among different instruments are poor, a system and comprehensive test scheme cannot be provided, and the requirements of a modern power system on high-quality test are difficult to meet, especially the application under the high-altitude and low-pressure environments. Disclosure of Invention In order to overcome the defect of poor reliability of a spare power automatic switching test method, the invention provides the spare power automatic switching test method and system for simulating the working condition of a power system. The technical scheme of the invention is that the spare power automatic switching test method for simulating the working condition of the power system comprises the following steps: the method comprises the steps of S1, collecting operation parameter data of a spare power automatic switching device through a data acquisition system under high altitude and low air pressure, and carrying out strict data cleaning, feature extraction and standardization processing by utilizing a Z-score method, wherein the operation parameter data is divided into key feature data and auxiliary feature data, the key feature data refers in particular to parameters directly related to faults caused by viscosity change of lubricating oil, namely response delay and sensitivity reduction of the spare power automatic switching device, and the auxiliary feature data is factors covering the faults caused by viscosity change of the lubricating oil, namely environment temperature fluctuation data and electric load change data; S2, calculating the viscosity change range of the lubricating oil of the spare automatic switching device in a high-altitude and low-air-pressure environment by using a mathematical model and a simulation tool based on an altitude change formula and a viscosity change formula of air pressure, and defining the viscosity change range as a viscosity reference interval; And S3, constructing a multi-layer simulation test model, wherein the multi-layer simulation test model comprises a reference layer, a feature selection layer and a simulation layer, the reference layer defines a viscosity reference interval, the feature selection layer is used for selecting representative auxiliary feature data samples, and the simulation layer realizes systema