CN108051647B - Method for correcting and measuring soil resistivity of wind power plant - Google Patents
Method for correcting and measuring soil resistivity of wind power plant Download PDFInfo
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- CN108051647B CN108051647B CN201711248062.4A CN201711248062A CN108051647B CN 108051647 B CN108051647 B CN 108051647B CN 201711248062 A CN201711248062 A CN 201711248062A CN 108051647 B CN108051647 B CN 108051647B
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Abstract
The invention provides a method for correcting and measuring soil resistivity of a wind power plant, which comprises the following steps: selecting a measuring center point; two groups of measuring electrodes which are symmetrical to the measuring center point are arranged, and the soil resistivity of the wind power plant is measured by utilizing the at least two groups of measuring electrodes; carrying out correction measurement on the two groups of measurement electrode exchange electrodes to obtain the soil resistivity of a corrected wind power plant; and when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than a preset value, determining the average value of the wind power plant soil resistivity measured for many times as the wind power plant soil resistivity. The invention has the advantages of accurate measurement and low measurement difficulty.
Description
Technical Field
The invention relates to the field of wind power plant resistance measurement rate, in particular to a method for correcting and measuring soil resistivity of a wind power plant.
Background
Wind resources have been vigorously developed domestically in recent years due to their cleanliness, renewability, and abundant reserves. The wind power generation field has small occupied area and is a promising clean energy, most wind power generation field substations are built in hilly lands, the soil structure is complex, and the grounding resistance is high. The characteristics of complex soil structure and high resistivity increase the difficulty of the measurement work of the soil resistivity of the wind power plant. Therefore, it is necessary to develop a method for measuring and correcting the soil resistivity suitable for the wind power plant.
Disclosure of Invention
The invention provides a method for correcting and measuring the soil resistivity of a wind power plant, which overcomes the characteristic of high difficulty in measuring the soil resistivity of the wind power plant at present.
The invention provides a method for correcting and measuring soil resistivity of a wind power plant, which comprises the following steps:
selecting a measuring center point;
two groups of measuring electrodes which are symmetrical to the measuring center point are arranged, and the soil resistivity of the wind power plant is measured by utilizing the at least two groups of measuring electrodes;
carrying out correction measurement on the two groups of measurement electrode exchange electrodes to obtain the soil resistivity of a corrected wind power plant;
and when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than a preset value, determining the average value of the wind power plant soil resistivity measured for many times as the wind power plant soil resistivity.
Preferably, the two sets of measuring electrodes include a pair of voltage measuring electrodes and a pair of current measuring electrodes.
Preferably, the step of measuring the soil resistivity of the wind farm by using the two sets of measuring electrodes further includes:
measuring the soil resistivity of the wind power plant for multiple times by using the two groups of measuring electrodes;
and when the polar distance values measured for multiple times are measured, the polar distance value of the next time is 1 to 1.5 times of the polar distance value of the last time.
Preferably, when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is larger than a preset value, re-measurement is carried out, if the preset value is larger for three times continuously, the measurement point is re-established, and until the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than the preset value, the wind power plant soil resistivity average value measured for multiple times is determined as the wind power plant soil resistivity.
Compared with the prior art, the method for correcting and measuring the soil resistivity of the wind power plant comprises the steps of arranging two groups of measuring electrodes which are symmetrical to the measuring center point, and measuring the soil resistivity of the wind power plant by using the at least two groups of measuring electrodes; carrying out correction measurement on the two groups of measurement electrode exchange electrodes to obtain the soil resistivity of a corrected wind power plant; and when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than a preset value, determining the average value of the wind power plant soil resistivity measured for multiple times as the wind power plant soil resistivity, and having the advantages of low measurement difficulty and high measurement accuracy.
Drawings
FIG. 1 is a flow chart of a method for wind farm soil resistivity calibration measurement, which is a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the method for measuring and correcting the soil resistivity of the wind power plant according to the present invention includes:
s1: selecting a measuring center point;
s3: two groups of measuring electrodes which are symmetrical to the measuring center point are arranged, and the soil resistivity of the wind power plant is measured by utilizing the at least two groups of measuring electrodes;
s5: carrying out correction measurement on the two groups of measurement electrode exchange electrodes to obtain the soil resistivity of a corrected wind power plant;
s7: and when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than a preset value, determining the average value of the wind power plant soil resistivity measured for many times as the wind power plant soil resistivity.
Further, the two sets of measuring electrodes include a pair of voltage measuring electrodes and a pair of current measuring electrodes.
Further, measuring the soil resistivity of the wind power plant for a plurality of times by using the two groups of measuring electrodes in S3; and when the polar distance values measured for multiple times are measured, the polar distance value of the next time is 1 to 1.5 times of the polar distance value of the last time.
Further, when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is larger than a preset value, re-measurement is carried out, if the preset value is larger for three times continuously, the measurement point is re-established, and until the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than the preset value, the wind power plant soil resistivity average value measured for multiple times is determined to be the wind power plant soil resistivity.
Specifically, the method for measuring and correcting the soil resistivity of the wind power plant comprises a quadrupole measurement method and a quadrupole correction measurement method, wherein a quadrupole measurement device comprises quadrupole measurement equipment, and a quadrupole distance arrangement principle is adopted; the quadrupole correction measurement method comprises a quadrupole correction measurement device and a correction principle, wherein the quadrupole correction measurement method is a basis for measuring the soil resistivity of the wind power plant, the pole distance arrangement plays a crucial role, the quadrupole correction measurement method adopts a mode of exchanging measurement poles to correct the measured soil resistivity, the measurement result is compared with the correction measurement result, the final value of the soil resistivity is determined according to the correction principle, and the measurement accuracy is ensured. The specific design is as follows:
1) the measuring equipment can simply and quickly measure the initial value of the soil resistivity of the wind power plant by a quadrupole method, namely the two-pair electrode measuring method;
2) the four-pole method pole distance arrangement principle comprises a Wenner arrangement method and a '1-2-3-5-7 principle', wherein the Wenner arrangement method is also called an equidistant four-pole method, four measuring grounding poles are positioned on a horizontal line at the same depth, the distances between every two measuring poles are equal, the method has no requirement on driving the electrodes into the ground, and the operation is simple; wherein the principle of 1-2-3-5-7 means that the distance between adjacent poles is 1 to 1.5 times of the distance between the last pole when the measured pole distances are arranged in an ascending order, namely, 1: the requirement of about 1.5 can have higher robustness and obtain enough dense measuring points, so that the measuring polar distance can be obtained according to 1/2/3/5/7 proportion within an order of magnitude range, for example, the polar distance is within a range of 1m to 10m, and the polar distance is 1m, 2m, 3m, 5m, 7m and 10 m; the polar distance is within the range of 10 m-100 m, the polar distance is 10m, 20m, 30m, 50m, 70m and 100m, and the maximum polar distance amax is 1-3 times the length of the diagonal of the ground screen.
3) The quadrupole calibration measuring device is modified and designed on the basis of the quadrupole measuring device, the device principle is that the positions of a current measuring electrode and a voltage measuring electrode of a quadrupole measuring device are exchanged, the measuring result is theoretically equal to that before exchange, if the measuring result is not equal to that before exchange, a measuring error or an inaccurate measuring result possibly exists, so that the positions of the voltage electrode and the current electrode of the quadrupole calibration measuring device are exchanged, and the rest parts are designed to have the same structure as the quadrupole measuring device.
4) The correction principle is that if the deviation between the measurement result and the correction result is within a preset value, if the deviation is within 5%, the soil resistance of the wind power plant is averaged; if the deviation between the measurement result and the correction result is more than 5%, re-measuring; and if the deviation of the three measurement results and the correction result is more than 5%, discarding the measurement point and establishing a new measurement point.
The method comprises the following steps:
1) the method is characterized in that a quadrupole method is firstly carried out to measure the earth resistivity model, two quadrupole method measuring devices are provided, one is a current voltmeter method, the other is a grounding voltmeter method, the current voltmeter device is adopted for measuring, and the measuring steps are as follows: firstly, performing field survey, determining a measuring central point, then keeping the position of the measuring central point unchanged, and wiring in the north-south direction (or in any direction) with a polar distance diWenner's isometric quadrupole method; then keeping the position of the measuring center point unchanged, and changing the measuring polar distances to take values of 0.5m, 0.7m, 1m, 2m, 3m, 5m, 7m, … and a according to the polar distance arrangement principle of the 1-2-3-5-7 principlemax", the wiring is re-routed in the east-west direction (or perpendicular to the last measurement direction)Arranging a grounding electrode to carry out the same measurement, and observing the difference of apparent resistivity in two directions; finally, after the m groups of pole distances are arranged, the root mean square error formula F is adopted1Performing one-dimensional inversion and three-dimensional inversion of the soil model:
where ρ isaAnd ρMRespectively, a forward evolution value and a measured value of apparent resistivity of the quadrupole method.
It should be noted that, in the measurement process, it is still determined whether to supplement the local measurement according to the inversion result, that is, the measurement center point is moved, and then the supplementary measurement and the inversion are performed according to the above steps.
2) The method is modified and designed on the basis of quadrupole measurement equipment, the principle of the quadrupole measurement equipment is that the positions of a current measurement electrode and a voltage measurement electrode of the original quadrupole method are exchanged, and because the Wenner is adopted to arrange the equidistant quadrupole method, the apparent resistivity rho obtained by measurement is required to be as follows before and after the exchange:
wherein, V2-3Is the potential difference between 2 and 3 electrodes, and h is the electrode buried depth.
After changing the position of the current electrode and the voltage electrode, the apparent resistivity calculated by the formula is equal to that before changing.
The measuring step of the soil correction resistivity measured by the quadrupole method correcting device is the same as the measuring step of the quadrupole method measuring device, the measuring center point adopts the center point of a measuring method, the pole distance selection principle is still the '1-2-3-5-7 principle', the arrangement direction and the pole distance selection requirement of the measuring grounding electrode are the same as the measuring method, and after the apparent resistivity is measured, the result is compared with the result of the measuring method.
3) After obtaining the measurement results of the measurement method and the measurement results of the calibration method, the two results are compared, and a final soil resistivity model is determined according to the following calibration principle:
if the deviation between the measurement result and the correction result is within 5% of the preset value, the initial measurement value is considered to be effective, and the average value of the measurement result and the correction result is taken from the soil resistance of the wind power plant;
if the deviation between the measurement result and the correction result is larger than 5%, the error of the initial measurement value is considered to be too large, the soil resistivity under the polar distance and the arrangement mode is measured by adopting the quadrupole measurement device and the quadrupole correction measurement device again, and the results are compared again until the deviation of the results is smaller than 5%.
If the deviation between the measurement result and the correction result is larger than the preset value after three times of re-measurement, selecting 5% of the point, and considering that the measurement center point cannot accurately acquire the earth resistivity, discarding the point, performing field investigation again, and determining a new measurement center point again.
Compared with the prior art, the invention has the following beneficial effects: the method is suitable for measuring the soil resistivity of the wind power plant in the high-resistance soil area; the invention provides a new quadrupole method polar distance arrangement principle: the 1-2-3-5-7 principle is adopted, the polar distance arranged according to the principle has higher robustness, and meanwhile, enough dense measuring points can be obtained, so that a solid foundation is laid for accurately obtaining the soil resistivity of the wind power plant; the invention designs a device capable of correcting the accuracy of the soil resistivity measurement result of the quadrupole method, the principle of the device is simple and easy to understand, the device has strong operability and convenient measurement, the device can be directly obtained by modifying the quadrupole method measurement device, the cost is reduced, the economic waste is avoided, and meanwhile, a certain guarantee is provided for the accuracy of the soil resistivity measurement of the high-resistance area by the quadrupole method; the invention provides a soil resistivity correction principle, provides a criterion for soil resistivity correction by a quadrupole method, is scientific and feasible after being verified by a large number of engineering practice projects, and can ensure the accuracy of measuring the earth resistivity of a wind power plant by the quadrupole method.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A method for wind farm soil resistivity calibration measurements, the method comprising:
selecting a measuring center point;
two groups of measuring electrodes of a four-pole measuring device which is symmetrical to the measuring center point are arranged, and the soil resistivity of the wind power plant is measured by using the two groups of measuring electrodes;
exchanging the positions of a current measuring electrode and a voltage measuring electrode of the quadrupole measuring equipment, and performing correction measurement to obtain the soil resistivity of a corrected wind power plant;
and when the error between the wind power plant soil resistivity and the corrected wind power plant soil resistivity is smaller than a preset value, determining the average value of the wind power plant soil resistivity measured for many times as the wind power plant soil resistivity.
2. The method for wind farm soil resistivity correction measurement according to claim 1, wherein the two sets of measure electrodes include a pair of voltage measure electrodes and a pair of current measure electrodes.
3. The method for wind farm soil resistivity correction measurement according to claim 1, characterized in that when the error between the wind farm soil resistivity and the corrected wind farm soil resistivity is larger than a preset value, re-measurement is performed, if the preset value is larger for three consecutive times, a measurement point is re-established until when the error between the wind farm soil resistivity and the corrected wind farm soil resistivity is smaller than the preset value, the average value of the wind farm soil resistivity measured for multiple times is determined as the wind farm soil resistivity.
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| EP1174715A2 (en) * | 2000-07-13 | 2002-01-23 | National Research Institute For Earth Science And Disaster Prevention | System for measuring amount of specific substance mixed in material under measurement and electrode rod for measurement |
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| CN206002607U (en) * | 2016-09-06 | 2017-03-08 | 国家电网公司 | A kind of soil resistivity measurement and ground network ground resistance acquisition device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102854392A (en) * | 2012-09-04 | 2013-01-02 | 中国能源建设集团广东省电力设计研究院 | Method and device for measuring indoor resistivity of soil sample |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1174715A2 (en) * | 2000-07-13 | 2002-01-23 | National Research Institute For Earth Science And Disaster Prevention | System for measuring amount of specific substance mixed in material under measurement and electrode rod for measurement |
| CN101576587A (en) * | 2009-06-30 | 2009-11-11 | 北京冶建特种材料有限公司 | Measurement method of concrete resistivity and device thereof |
| CN102509242A (en) * | 2011-10-20 | 2012-06-20 | 四川诺特科技有限公司 | RFID (radio frequency identification) technology based non-metallic ion grounding body management method and system |
| CN102879688A (en) * | 2012-10-12 | 2013-01-16 | 宁波市鄞州供电局 | Test system for grounding grid |
| CN104375007A (en) * | 2014-11-21 | 2015-02-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Soil resistivity measurement method and device based on phase identification |
| CN206002607U (en) * | 2016-09-06 | 2017-03-08 | 国家电网公司 | A kind of soil resistivity measurement and ground network ground resistance acquisition device |
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