Method and device for evaluating electric energy quality of tunneling equipment

Abstract

The invention belongs to the technical field of power quality evaluation of an underground coal mine power supply system, and provides a method and a device for evaluating the power quality of tunneling equipment in order to solve the problems of insufficient and inaccurate power supply power quality treatment measure estimation and unobvious effect when the tunneling equipment works under all working conditions. The method comprises the following steps: acquiring electric energy quality index data and an action signal of the tunneling equipment in the first time, calculating to obtain an electric energy quality index weight, a working condition weight and electric energy quality index scores under different working conditions according to the acquired data, and performing electric energy quality evaluation on the tunneling equipment under all working conditions according to the scores. The requirement for evaluating the matching degree of the electric energy quality of the tunneling equipment and the tunneling working face is met, a high-quality electric energy guarantee is provided for safe, efficient and low-carbon operation of the tunneling equipment, a basis is provided for optimizing the performance of the tunneling equipment under different working conditions, and great technical advantages and economic advantages are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of power quality assessment of underground power supply systems in coal mines, and in particular relates to a method and a device for assessing power quality of tunneling equipment. Background Art

[0002] The power supply system of the underground excavation working face of the coal mine transmits power to the excavation equipment through the four-level form of central power distribution station, mining area substation (distribution) station, mobile substation and working face load center. At present, only the front stage of the central power distribution station has reactive power compensation device. Among the numerous large-scale electromechanical equipment underground, there are usually no related monitoring and control devices for power quality. This leads to an unknown power quality of the excavation work at the end of the power distribution environment, and the matching degree of power quality between the excavation equipment and the power supply system is unknown.

[0003] A typical situation is that when the excavation equipment is more than 1,000 meters away from the mobile substation of the excavation working face, the voltage drop generated on the long-distance power supply cable makes the voltage at the end of the excavation equipment low, making it difficult or even impossible to start the excavation equipment. The substation needs to be moved forward, interrupting the continuity of the excavation operation and increasing the time and personnel of the excavation maintenance team. In addition, power quality problems such as power supply frequency deviation, harmonic content, and three-phase voltage imbalance on the excavation equipment side will affect the normal operation of the high-power motor in the excavation equipment, causing the motor to be in an overload state for a long time or even short-term abnormal damage, affecting the continuity and safety of excavation production. At present, there is a consensus that there are power quality problems in the excavation working face. In the early design stage of the mine, the severity of the power quality problems of the working face is estimated through theoretical calculations and other methods, and then the power supply and distribution equipment and cables are selected based on this. However, with the upgrade and replacement of underground tunneling equipment, the total power of the equipment has increased, and the number of high-power inverters and other equipment has increased, which has aggravated the power quality problem at the tunneling working face. It is inevitable that the power supply quality management measures will be insufficiently estimated, inaccurate and ineffective.

[0004] Tunneling equipment is a non-continuous and impact load, which requires frequent start and stop to cooperate with the operation process of the tunneling face. In addition, the current size is inconsistent when cutting different rock hardnesses. Only by coordinating these working conditions can the power quality problems of tunneling equipment be truly reflected. For this reason, it is necessary to evaluate the power quality problems on the power supply line side of the tunneling equipment. When evaluating the power supply quality of the tunneling equipment, it is necessary to combine it with the operating conditions of the tunneling equipment and conduct a power quality evaluation based on the full working process of the tunneling equipment, so as to provide more accurate high-quality power support for intelligent tunneling and provide a basis for the safety margin design of the electrical system of the tunneling equipment. Summary of the invention

[0005] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a method and device for evaluating the power quality of tunneling equipment.

[0006] In a first aspect, the present invention provides a method for evaluating power quality of tunneling equipment, comprising the following steps:

[0007] Acquire power quality index data and action signals of the tunneling equipment within a first time, wherein the first time includes at least the time of a complete operation process;

[0008] Establish a power quality index matrix based on power quality indicators;

[0009] Scoring the power quality index according to the power quality index matrix and the preset power quality grade index limit to obtain the power quality index score of the tunneling equipment;

[0010] Dividing the working conditions of the tunneling equipment based on the tunneling equipment action signal, and determining the power quality index score under a single working condition based on the working condition division result and the power quality index score;

[0011] Allocate power quality indicators and operating condition weights based on the model of tunneling equipment;

[0012] The power quality of tunneling equipment is evaluated according to the power quality index weight, operating condition weight and the power quality index scores under different operating conditions.

[0013] Preferably, after obtaining the power quality index data and action signal of the tunneling equipment within the first time, it also includes: obtaining the operating condition information according to the action signal of the tunneling equipment, adding the operating condition information of the same time period to the power quality index data as a label, and storing the marked result.

[0014] Preferably, the method for obtaining the power quality index score of the tunneling equipment is:

[0015] Obtain the power quality index classification table;

[0016] Based on the power quality index classification table, the power quality index is processed positively;

[0017] The power quality index score of the tunneling equipment is obtained based on the power quality index after the forward processing.

[0018] Preferably, a first judgment matrix and a second judgment matrix are established based on the hierarchical analysis method, respectively, and the weights of the power quality indicators are determined based on the first judgment matrix, and the weights of the tunneling equipment working conditions are determined based on the second judgment matrix.

[0019] Preferably, the process of determining the power quality indicator weight based on the first judgment matrix includes:

[0020] Constructing a first judgment matrix using a scaling method and power quality indicators, and determining its maximum eigenvalue and corresponding eigenvector according to preset constraints;

[0021] Check whether the first judgment matrix satisfies consistency. If so, construct the power quality index weight based on the corresponding eigenvector. If not, reconstruct the first judgment matrix and recheck the consistency.

[0022] The power quality indicator weight is subjected to norm normalization processing.

[0023] Preferably, the process of determining the operating condition based on the second judgment matrix includes:

[0024] Constructing a second judgment matrix using the scaling method and the working condition information, and determining its maximum eigenvalue and corresponding eigenvector according to preset constraints;

[0025] Check whether the second judgment matrix satisfies consistency. If so, construct the operating condition weights based on the corresponding eigenvectors. If not, reconstruct the second judgment matrix and recheck the consistency.

[0026] Preferably, the expression of the power quality assessment result y is:

[0027]

[0028] Among them, y i is the power quality assessment result obtained under the ith working condition, (U i w 指标 ) j is the jth element of the vector, w 工况 is the working condition weight of tunneling equipment, w 指标 is the power quality index weight, T i is the data collection time of the i-th working condition, U i It is the power quality index score.

[0029] In a second aspect, the present invention provides a method for evaluating power quality of tunneling equipment capable of executing the method described in the first aspect and any optional embodiment, specifically comprising:

[0030] Voltage and current transformer units are used to convert high voltage and high current into standard voltage and standard current that can be received by measuring instruments and protection equipment;

[0031] Signal conditioning and acquisition unit, used to collect real-time voltage and current signals and filter out interference and noise;

[0032] External signal input unit, used to collect action signals of tunneling equipment;

[0033] An index calculation unit, used for calculating according to the standard voltage and the standard current to obtain the power quality index and store the power quality index;

[0034] The evaluation and display unit is used for positively processing power quality indicators, calculating power quality evaluation results, and displaying evaluation results.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides a method and device for evaluating the power quality of tunneling equipment, which can enable tunneling equipment operators and ground monitoring personnel to grasp the detailed power quality of tunneling equipment under all working conditions of the tunneling working face, and play a positive role in exerting the working performance of the tunneling equipment; for tunneling operators, it can directly reflect the actual power supply status of the equipment, facilitate the adoption of corresponding measures, and be beneficial to improving the working capacity of the tunneling equipment, helping to optimize the functions of the tunneling equipment such as autonomous cutting, and improving the equipment performance and intelligence level from the perspective of power quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 1 is a flow chart of a method for evaluating power quality of tunneling equipment according to an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of power quality indicators of a coal mine hard rock tunneling machine according to an embodiment of the present invention;

[0040] Figure 3 : is a line voltage and current waveform diagram when the tunneling equipment of an embodiment of the present invention is cutting;

[0041] Figure 4 : is a line voltage and current waveform diagram when the tunneling equipment according to an embodiment of the present invention is started;

[0042] Figure 5 : is a line voltage and current waveform diagram when the tunneling equipment of an embodiment of the present invention is shut down;

[0043] Figure 6 A real-time power quality assessment score curve and a grade sequence diagram of an embodiment of the present invention;

[0044] Figure 7 It is a schematic diagram of the structure of a power quality assessment device for tunneling equipment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0047] The tunneling operation conditions include starting, no-load, cutting, lifting, scraping, belt transportation and other links. If it is a tunneling and anchoring machine, there is also an anchor protection link. Different types of tunneling equipment need to evaluate different power quality indicators. At the same time, it is necessary to comprehensively evaluate each power quality indicator in combination with different operating conditions, and form an evaluation result based on different operating conditions, so as to judge the working conditions corresponding to each working condition under the full working condition of the tunneling equipment.

[0048] Therefore, the present invention provides a method and device for evaluating the power quality of tunneling equipment, which evaluates the power quality index problems on the power incoming line side of the tunneling equipment, thereby providing high-quality power support for the tunneling equipment more accurately under different working conditions, and also providing a basis for the safety margin design of the electrical system of the tunneling equipment.

[0049] The embodiments of the present invention all take a certain type of coal mine hard rock tunneling machine as an example, and determine the power quality evaluation index system of the coal mine hard rock tunneling machine of this type.

[0050] The embodiment of the present invention provides a method for evaluating the power quality of tunneling equipment. Figure 1 As shown, the following steps are included:

[0051] S1: Acquire power quality index data and action signals of the tunneling equipment within a first period of time, wherein the first period of time at least includes the time of a complete operation process.

[0052] In this embodiment, the time for a complete operation process is the collection time lasting at least one work shift, which ensures the time for a complete operation process of the excavation face production team, which is generally 8 hours.

[0053] In this embodiment, the power quality index data can be collected by power quality monitoring equipment, or the power quality index data can be obtained by collecting voltage and current and calculating. Figure 2 As shown, an electric energy quality index of a coal mine hard rock tunneling machine in an embodiment of the present invention includes six indicators: power factor, voltage fluctuation, voltage deviation, voltage total harmonic distortion rate, voltage three-phase imbalance, and frequency deviation.

[0054] Optionally, after obtaining the power quality index data and action signal of the tunneling equipment within the first time, it also includes: obtaining operating condition information according to the action signal of the tunneling equipment, adding the operating condition information of the same time period to the power quality index data as a label, and storing the marked result.

[0055] In this embodiment, the voltage and current sequence waveforms of the start-up, cutting and shutdown of the tunneling equipment are collected, such as Figure 3-Figure 5 As shown, the power quality index data is determined based on the voltage and current data, and then the working condition is marked, the working condition information and the power quality index data are matched and marked, and the marking result is stored.

[0056] S2: Establish a power quality index matrix based on the power quality index.

[0057] In this embodiment, the power quality indicator matrix is:

[0058]

[0059] Among them, x tm is the mth power quality index at the tth time point, T is the number of finite time points, and M is the total number of power quality indicators.

[0060] S3: Score the power quality index according to the power quality index matrix and the preset power quality grade index limit to obtain the power quality index score of the tunneling equipment.

[0061] Optionally, the method for obtaining the power quality index score of the tunneling equipment is: obtaining a power quality index grade classification table; based on the power quality index grade classification table, performing index positive processing on the power quality index; and obtaining the power quality index score of the tunneling equipment based on the power quality index after the positive processing.

[0062] In this embodiment, the power quality index level classification table is shown in Table 1 below:

[0063] Table 1

[0064]

[0065] According to the preset power quality level index limit values ​​in Table 1, the power quality index is processed positively. The positive processing formula is:

[0066]

[0067] In the formula, is the mth power quality index in the j The preset power quality level indicator limit under each level type.

[0068] In this embodiment, the power quality index after positive processing is used to obtain the power quality index score of the tunneling equipment, and the power quality index score is:

[0069]

[0070] Among them, u tm is the mth power quality index forward processing value at the tth time point. This implementation takes the power quality index corresponding to the Vth level in Table 1 as an example, and processes the power quality index matrix X into the power quality index score U. Other levels in Table 1 are also applicable to the method described in the present invention, and the present invention is not limited thereto.

[0071] S4: Divide the working conditions of the tunneling equipment based on the tunneling equipment action signal, and determine the power quality index score under a single working condition based on the working condition division result and the power quality index score.

[0072] In this embodiment, the working conditions of the hard rock tunnel boring machine can be divided into six types: I (oil pump motor stopped, cutting motor stopped), II (oil pump motor started, cutting motor stopped), III (oil pump motor no-load, cutting motor stopped), IV (oil pump motor no-load, cutting motor started), V (oil pump motor no-load, cutting motor no-load), VI (oil pump motor loaded, cutting motor cutting).

[0073] In this embodiment, according to the action signal of the tunneling equipment, the power quality index is matched with the divided working conditions, and the power quality index score under the single working condition is obtained according to the power quality index score after the positive processing. The power quality index score under the single working condition is:

[0074]

[0075] in, is the tth time under working condition i i The mth power quality indicator forward processing value at the time point.

[0076] S5: Allocate power quality indicators and operating condition weights based on the model of tunneling equipment.

[0077] In this embodiment, the power quality index system of the tunneling equipment is determined according to the model of the tunneling equipment, and then the weight is allocated according to the working condition classification result and the corresponding power quality index.

[0078] S6: Evaluate the power quality of tunneling equipment based on the power quality index weight, operating condition weight and the power quality index score under different operating conditions.

[0079] In this embodiment, the expression of the power quality assessment result y is:

[0080]

[0081] Among them, y i is the power quality assessment result obtained under the ith working condition, (U i w 指标 ) j is the jth element of the vector, w 工况 is the working condition weight of tunneling equipment, w 指标 is the power quality index weight, T i is the data collection time of the i-th working condition, U i It is the power quality index score.

[0082] The embodiment of the present invention obtains the power quality index data and action signals of the tunneling equipment within the first time, and establishes a power quality index matrix based on the power quality index; then scores the power quality index according to the power quality index matrix and the preset power quality grade index limit; at the same time, the tunneling equipment working conditions are divided based on the tunneling equipment action signals, and the power quality index scores under the individual working conditions are determined based on the working condition division results and the power quality index scores; then the power quality index and working condition weights are allocated based on the model of the tunneling equipment; finally, the power quality of the tunneling equipment is evaluated according to the power quality index weights, working condition weights and power quality index scores under different working conditions, so as to meet the requirements for evaluating the matching degree of power quality between the tunneling equipment and the tunneling working face, provide a basis for the power quality management of the tunneling working face, provide power guarantee for the safe, efficient and low-carbon operation of the tunneling equipment, provide data support for the operation of the tunneling equipment under different working conditions, and provide a basis for optimizing the performance of the tunneling equipment under different working conditions, which has great technical and economic advantages.

[0083] Optionally, a first judgment matrix and a second judgment matrix are respectively established based on the hierarchical analysis method, and the weight of the power quality index is determined based on the first judgment matrix, and the weight of the tunneling equipment working condition is determined based on the second judgment matrix.

[0084] Optionally, the process of determining the power quality indicator weight based on the first judgment matrix includes:

[0085] Constructing a first judgment matrix using a scaling method and power quality indicators, and determining its maximum eigenvalue and corresponding eigenvector according to preset constraints;

[0086] Check whether the first judgment matrix satisfies consistency. If so, construct the power quality index weight based on the corresponding eigenvector. If not, reconstruct the first judgment matrix and recheck the consistency.

[0087] The power quality indicator weight is subjected to norm normalization processing.

[0088] Optionally, the process of determining the operating condition based on the second judgment matrix includes:

[0089] Constructing a second judgment matrix using the scaling method and the working condition information, and determining its maximum eigenvalue and corresponding eigenvector according to preset constraints;

[0090] Check whether the second judgment matrix satisfies consistency. If so, construct the operating condition weights based on the corresponding eigenvectors. If not, reconstruct the second judgment matrix and recheck the consistency.

[0091] In this embodiment, when there are many power quality indicator systems, Figure 2 As shown in the figure, it is decomposed into several layers from top to bottom. The factors in the same layer are subordinate to the factors in the upper layer or have an impact on the factors in the upper layer, and at the same time dominate the factors in the lower layer or are affected by the factors in the lower layer. The highest layer is the target layer, which is the final goal to be achieved; the lower layer is the criterion layer, which can be further decomposed into sub-criterion layers when there are too many criteria; the lowest layer is the indicator layer composed of multiple indicators. At the criterion layer and indicator layer, the weights of the corresponding data of different criterion layers and indicator layers can be calculated based on the impact of different power supply power quality indicators on tunneling equipment.

[0092] In this embodiment, the 1-9 scaling method is used to calculate the weights of the data corresponding to different criterion layers and indicator layers, as shown in Table 2.

[0093] Table 2

[0094] Scale meaning 1 Indicates that two elements have the same importance. 3 Indicates that compared with two elements, the former is slightly more important than the latter 5 Indicates that compared with two elements, the former is obviously more important than the latter 7 Indicates that compared with two elements, the former is extremely important than the latter 9 Indicates that compared with two elements, the former is more important than the latter 2、4、6、8 Indicates the middle value of the above adjacent judgments Count down from 1 to 9 Indicates the importance of swapping the corresponding two elements

[0095] The first judgment matrix is ​​constructed using the 1-9 scaling method shown in Table 2. The first judgment matrix is:

[0096]

[0097] Among them, a kk’ is the importance of the kth indicator compared to the k'th indicator, and K is the number of indicators selected for comparison.

[0098] At this time, solve its maximum eigenvalue λ max1 and the corresponding eigenvector w (constraint: the 1-norm of w is 1, that is, ||w|| 1 =1), and calculate the consistency ratio test to determine whether the first judgment matrix A satisfies the consistency. When the first judgment matrix A passes the consistency test, the power quality index weight is constructed based on the corresponding eigenvector w; if the consistency test fails, the first judgment matrix A is reconstructed.

[0099] To further illustrate the process of constructing the first judgment matrix using the hierarchical analysis method in this embodiment, Figure 2 For example, the frequency index determines whether the motor of the tunneling equipment can operate normally without failure, and its importance is higher than the voltage index and power index; the voltage deviation in the voltage index determines whether the motor can start normally under long-distance power supply, and its importance is higher than the voltage three-phase imbalance or the voltage total harmonic distortion rate. Based on this, the first judgment matrix of the criterion layer voltage index, frequency index, and power index is established. The first judgment matrix A 1 for:

[0100]

[0101] The consistency index is verified to be: 0.0559<0.1, which satisfies the consistency index verification. There is no need to reconstruct the judgment matrix. The weight is calculated as w 1 =[0.279,0.0719,0.6491].

[0102] Secondly, the first judgment matrix of the indicator layer voltage deviation, voltage fluctuation, voltage total harmonic distortion rate, and voltage three-phase imbalance is established. The first judgment matrix of the indicator layer A 2 for:

[0103]

[0104] The consistency index is verified to be: 0.0433<0.1. The consistency index verification is satisfied. There is no need to reconstruct the judgment matrix. The weight is calculated as w 2 =[0.565,0.0553,0.2622,0.1175].

[0105] At the indicator layer, voltage deviation, voltage fluctuation, voltage total harmonic distortion rate, and voltage three-phase imbalance are subordinate to voltage indicators, power factor is subordinate to power indicators, and frequency deviation is subordinate to frequency indicators. Based on the above, the final weight of the power quality indicator is calculated using the product method.

[0106] Combined with 1 and w 2 The indicator weight w 指标for:

[0107] w 指标 =[[0.565,0.0553,0.2622,0.1175]*0.279,0.0719,0.6491]

[0108] Then normalize its 1-norm:

[0109] w 指标 =[0.1576,0.0154,0.0732,0.0328,0.0719,0.6495]

[0110] In this embodiment, the second judgment matrix is:

[0111]

[0112] Among them, b ll’ is the importance of the lth working condition compared to the l'th working condition, and L is the number of selected compared indicators.

[0113] The consistency ratio is used to check whether the second judgment matrix B satisfies consistency. After passing the consistency ratio check, the maximum eigenvalue λ can be solved. 2max and the corresponding eigenvector w 工况 , and set the constraints as: w 工况 The 1-norm of ||w is 1, that is, 工况 || 1 =1, then w 工况 Corresponding to the weight of each working condition.

[0114] To further illustrate the process of constructing the second judgment matrix using the hierarchical analysis method in this embodiment, the working conditions II and IV after the working condition division in this embodiment are taken as examples. When in working condition II, a voltage drop occurs, and working condition IV produces a more obvious voltage drop than working condition II, so working condition IV is more important than working condition II. Therefore, taking working condition VI as an example, it is an important working condition for the excavation equipment to exert the cutting effect, and it is the most important. Based on this, the second judgment matrix B of the working condition is established:

[0115]

[0116] The consistency index is verified to be: 0.0742<0.1, which satisfies the consistency index verification. Then the weights of working conditions I, II, III, IV, V, and VI are calculated as follows:

[0117] w 工况 =[0.0269,0.1164,0.0663,0.2709,0.0607,0.4587]

[0118] To further illustrate the method for evaluating the power quality of tunneling equipment according to an embodiment of the present invention, the power quality index weights and the working condition weights of tunneling equipment according to the above embodiment are taken as an example to calculate the power quality evaluation scores y of working conditions I to VI. 1 ~y 6 They are: [0.3217, 0.4916, 0.4850, 0.4050, 0.5130, 0.756] respectively. Then the power quality assessment score in the first time is: y = [y 1 …y 6 ]w 工况 =0.5857.

[0119] In this embodiment, the power quality assessment scores corresponding to the five different level limits shown in Table 1, the calculated corresponding relationship between the index level and the power quality assessment score is shown in Table 3 below:

[0120] Table 3

[0121]

[0122] According to the data shown in Table 3, the larger the power quality evaluation score in the same level, the higher the credibility of the power quality belonging to this level, and the better the power quality level of the tunneling equipment power supply system. Figure 6 The real-time power quality assessment score curve and the level sequence diagram shown. In this embodiment, the power quality assessment score y is 0.5857 and is within the range of (0.5835, 0.7985), indicating that the power quality level of this working state in the first time in the embodiment is finally at level II.

[0123] In this embodiment, a device for evaluating the power quality of excavation equipment is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "unit" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0124] This embodiment provides a device for evaluating the power quality of tunneling equipment. Figure 7 As shown, including:

[0125] The voltage and current transformer unit is used to convert high voltage and high current into standard voltage and standard current that can be received by measuring instruments and protection equipment; the flameproof voltage and current transformer unit is selected in this embodiment, which can be better applied to coal mine cutting operations;

[0126] Signal conditioning and acquisition unit, used to collect real-time voltage and current signals and filter out interference and noise;

[0127] External signal input unit, used to collect action signals of tunneling equipment;

[0128] An index calculation unit, used for calculating according to the standard voltage and the standard current to obtain the power quality index and store the power quality index;

[0129] The evaluation and display unit is used for positively processing power quality indicators, calculating power quality evaluation results, and displaying evaluation results.

[0130] The tunneling equipment power quality assessment device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0131] This invention mainly proposes a method and device for evaluating the power quality of tunneling equipment at the tunneling working face. For other similar electrical equipment that is subject to impact loads and whose operating processes are divided into several working conditions, the method and device provided by the present invention can be referred to.

[0132] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for evaluating power quality of tunneling equipment, characterized in that: The following steps are involved: Acquire power quality index data and action signals of the tunneling equipment within a first time, wherein the first time includes at least the time of a complete operation process; Establish a power quality index matrix based on power quality indicators; Scoring the power quality index according to the power quality index matrix and the preset power quality grade index limit to obtain the power quality index score of the tunneling equipment; Dividing the working conditions of the tunneling equipment based on the tunneling equipment action signal, and determining the power quality index score under a single working condition based on the working condition division result and the power quality index score; Allocate power quality indicators and operating condition weights based on the model of tunneling equipment; The power quality of tunneling equipment is evaluated according to the power quality index weight, operating condition weight and the power quality index scores under different operating conditions.

2. The method for evaluating power quality of tunneling equipment according to claim 1, characterized in that: After obtaining the power quality index data and action signal of the tunneling equipment within the first time, it also includes: obtaining working condition information according to the action signal of the tunneling equipment, adding the working condition information in the same time period to the power quality index data as a label, and storing the labeling result.

3. The method for evaluating power quality of tunneling equipment according to claim 1, characterized in that: The method for obtaining the power quality index score of the tunneling equipment is: Obtain the power quality index classification table; Based on the power quality index classification table, the power quality index is processed positively; The power quality index score of the tunneling equipment is obtained based on the power quality index after the forward processing.

4. The method for evaluating power quality of tunneling equipment according to claim 2, characterized in that: Based on the hierarchical analysis method, a first judgment matrix and a second judgment matrix are respectively established, and the weight of the power quality index is determined based on the first judgment matrix, and the weight of the tunneling equipment working condition is determined based on the second judgment matrix.

5. The method for evaluating power quality of tunneling equipment according to claim 4, characterized in that: The process of determining the power quality indicator weight based on the first judgment matrix includes: Constructing a first judgment matrix using a scaling method and power quality indicators, and determining its maximum eigenvalue and corresponding eigenvector according to preset constraints; Check whether the first judgment matrix satisfies consistency. If so, construct the power quality index weight based on the corresponding eigenvector. If not, reconstruct the first judgment matrix and recheck the consistency. The power quality indicator weight is subjected to norm normalization processing.

6. The method for evaluating power quality of tunneling equipment according to claim 4, characterized in that: The process of determining the operating condition based on the second judgment matrix includes: Constructing a second judgment matrix using the scaling method and the working condition information, and determining its maximum eigenvalue and corresponding eigenvector according to preset constraints; Check whether the second judgment matrix satisfies consistency. If so, construct the operating condition weights based on the corresponding eigenvectors. If not, reconstruct the second judgment matrix and recheck the consistency.

7. The method for evaluating power quality of tunneling equipment according to claim 6, characterized in that: The expression of power quality assessment result y is: Among them, y i is the power quality assessment result obtained under the ith working condition, (U i w 指标 ) j is the jth element of the eigenvector, w 工况 is the working condition weight of tunneling equipment, w 指标 is the power quality index weight, T i is the data collection time of the i-th working condition, U i It is the power quality index score.

8. A device for evaluating the power quality of tunneling equipment, characterized in that: The method for evaluating the power quality of tunneling equipment according to any one of claims 1 to 7 above can be implemented, specifically comprising: Voltage and current transformer units are used to convert high voltage and high current into standard voltage and standard current that can be received by measuring instruments and protection equipment; Signal conditioning and acquisition unit, used to collect real-time voltage and current signals and filter out interference and noise; External signal input unit, used to collect action signals of tunneling equipment; An index calculation unit, used to calculate according to the standard voltage and standard current to obtain the power quality index and store the power quality index; The evaluation and display unit is used for positively processing power quality indicators, calculating power quality evaluation results, and displaying evaluation results.

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