CN108414821B - Distribution transformer low-voltage side voltage three-phase imbalance evaluation method based on zero sequence voltage - Google Patents
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Abstract
The invention discloses a distribution transformer low-voltage side voltage three-phase unbalance evaluation method based on zero sequence voltage, which comprises the following steps: establishing real-time zero sequence voltage maximum unbalance rateRMZVRecording real-time maximum unbalance conditions of the three-phase voltage of the low-voltage side; establishing real-time zero sequence voltage minimum unbalance rateRNZVRecording real-time minimum unbalance conditions of the three-phase voltage of the low-voltage side; establishing real-time zero sequence voltage rated unbalance rateRRZVRecording real-time rated unbalance conditions of the three-phase voltage of the low-voltage side; establishing real-time zero sequence voltage average unbalance rateRAZVRecording real-time average unbalance conditions of the three-phase voltages at the low-voltage side; establishing real-time zero sequence voltage comprehensive unbalance rateRAZVRecording real-time comprehensive unbalance conditions of the low-voltage side three-phase voltage; comprehensive unbalance rate according to real-time zero sequence voltageRAZVAnd a three-phase voltage unbalance rate limitRVZLAnd comprehensively evaluating the three-phase imbalance condition of the low-voltage side voltage. The evaluation method can effectively reflect the unbalanced condition of the three-phase voltage at the low voltage side.
Description
Technical Field
The invention relates to the field of power quality of distribution networks, in particular to a three-phase unbalance evaluation method for low-voltage side voltage of a distribution transformer based on zero-sequence voltage.
Background
At present, along with the rapid development of economy, a large number of high-tech industrial parks are put into operation, the technological parks depend on high-precision automatic control equipment to realize production and manufacture of products, along with the large-scale application of high-precision electronic products, the problem of electric energy quality becomes more and more a concern, voltage dip or surge, imbalance of three-phase voltage and voltage, harmonic distortion and the like can lead to the shutdown of high-precision electronic production equipment, endanger production safety, and cause great economic loss and social influence.
Meanwhile, high-quality electric energy supply is also an important mark of a first-class distribution network, so that the electric energy quality of outgoing lines, important switching stations, important areas and important users of the transformer substation is analyzed, and the weak links of the power grid are found through comprehensive analysis of unbalance of three-phase voltages at the low-voltage side of the distribution transformer, and a feasible maintenance strategy is provided, so that the method has important practical significance.
Disclosure of Invention
The invention aims to solve the problem of three-phase voltage unbalance evaluation of a low-voltage side of a distribution transformer, and provides a three-phase voltage unbalance evaluation method of the low-voltage side of the distribution transformer based on zero-sequence voltage by combining the characteristics of a distribution network.
The technical scheme for achieving the purpose is as follows:
a distribution transformer low-voltage side voltage three-phase imbalance evaluation method based on zero sequence voltage, comprising the following steps:
(1) Establishing real-time zero sequence voltage maximum unbalance rateRMZVRecording real-time maximum unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer;
(2) Establishing real-time zero sequence voltage minimum unbalance rateRNZVRecording real-time minimum unbalance conditions of the three-phase voltage of the low-voltage side of the distribution transformer;
(3) Establishing real-time zero sequence voltage rated unbalance rateRRZVRecording real-time rated unbalance conditions of the three-phase voltage of the low-voltage side of the distribution transformer;
(4) Establishing real-time zero sequence voltage average unbalance rateRAVVRecording real-time average unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer;
(5) Establishing real-time zero sequence voltage comprehensive unbalance rateRAZVRecording real-time comprehensive unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer;
(6) Comprehensive unbalance rate according to real-time zero sequence voltageRAZVAnd a three-phase voltage unbalance rate limitRVZLAnd comprehensively evaluating the three-phase unbalance condition of the low-voltage side voltage of the distribution transformer.
Establishing real-time zero sequence voltage maximum unbalance rateRMZVThe real-time maximum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer is recorded, and the method specifically comprises the following steps:
wherein,,V 0 real-time zero sequence voltage value for low-voltage side of distribution transformer;V min is the smallest real-time voltage value of the three-phase load voltages on the low-voltage side A, B, C of the distribution transformer. Provision for provision ofV 0 AndV min at the same time, when the value is 0,RMZVis 0;V min is 0 toV 0 When the number of the organic light emitting diode is not 0,RMZVis-1.
Real-time zero sequence voltage value of low-voltage side of distribution transformerV 0 The method can be directly collected by a collecting device, if the zero sequence voltage collecting device is not provided, the method can be approximately calculated according to the three-phase voltage of the low-voltage side A, B, C of the distribution transformer, and the specific method comprises the following steps:
wherein,,V a 、V b 、V c the real-time voltage values of the three phases of the low-voltage side A, B, C of the distribution transformer are respectively obtained.
Establishing real-time zero sequence voltage minimum unbalance rateRNZVThe real-time minimum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer is recorded, and the real-time minimum unbalance condition is specifically as follows:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V max is the largest real-time voltage value among the three-phase voltages of the low-voltage side A, B, C of the distribution transformer. Provision for provision ofV max AndV 0 at the same time, when the value is 0,RNZVis 0.
Establishing real-time zero sequence voltage rated unbalance rateRRZVThe real-time rated unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer is recorded, and the real-time rated unbalance condition is specifically as follows:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V N is the rated voltage value of the low-voltage side of the distribution transformer.
Establishing real-time zero sequence voltage average unbalance rateRAVVTo record the real-time average unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer, the method specifically comprises the following steps:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the three-phase voltages on the low-side A, B, C of the distribution transformer,V a 、V b 、V c respectively, distribution transformersReal-time voltage values of three phases of the low voltage side A, B, C. Provision for provision ofV max AndV min at the same time, when the value is 0,RAVVis 0.
Establishing real-time zero sequence voltage comprehensive unbalance rateRAZVThe real-time comprehensive unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer is recorded, and the method specifically comprises the following steps:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min is the smallest real-time voltage value of the three-phase voltages on the low-voltage side A, B, C of the distribution transformer.
Comprehensive unbalance rate according to real-time zero sequence voltageRAZVAnd a three-phase voltage unbalance rate limitRVZLThe three-phase unbalance condition of the low-voltage side voltage of the distribution transformer is comprehensively evaluated, and specifically comprises the following steps:
(1) If the real-time zero sequence voltage comprehensive unbalance rate of a certain distribution transformerRAZVGreater than or equal to the three-phase voltage imbalance rate limitRVZLThe three-phase voltage at the low-voltage side of the distribution transformer is seriously unbalanced, and the unbalance degree is thatRAZV。
(2) If the real-time zero sequence voltage comprehensive unbalance rate of a certain distribution transformerRAZVLess than three-phase voltage unbalance rate limit valueRVZLAnd is not-1, the low-side three-phase voltage of the distribution transformer is in a balanced state.
(3) If the real-time zero sequence voltage comprehensive unbalance rate of a certain distribution transformerRAZVAnd is-1, the possibility of open phase exists at the low-voltage side of the distribution transformer.
The invention has the beneficial technical effects that: establishing real-time zero sequence voltage maximum unbalance rateRMZVRecording real-time maximum unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer; establishing real-time zero sequence voltage minimum unbalance rateRNZVTo record distribution transformersReal-time minimum unbalance condition of low-voltage side three-phase voltage; establishing real-time zero sequence voltage rated unbalance rateRRZVRecording real-time rated unbalance conditions of the three-phase voltage of the low-voltage side of the distribution transformer; establishing real-time zero sequence voltage average unbalance rateRAVVRecording real-time average unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer; establishing real-time zero sequence voltage comprehensive unbalance rateRAZVRecording real-time comprehensive unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer; comprehensive unbalance rate according to real-time zero sequence voltageRAZVAnd a three-phase voltage unbalance rate limitRVZLAnd comprehensively evaluating the three-phase unbalance condition of the low-voltage side voltage of the distribution transformer. The evaluation method can effectively reflect the unbalanced condition of the three-phase voltage at the low-voltage side of the distribution transformer, and has good practical value.
Drawings
Fig. 1 is a diagram of a typical power distribution network.
Detailed Description
The present invention will be described in detail below:
(1) Establishing real-time zero sequence voltage maximum unbalance rateRMZVRecording real-time maximum unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer;
(2) Establishing real-time zero sequence voltage minimum unbalance rateRNZVRecording real-time minimum unbalance conditions of the three-phase voltage of the low-voltage side of the distribution transformer;
(3) Establishing real-time zero sequence voltage rated unbalance rateRRZVRecording real-time rated unbalance conditions of the three-phase voltage of the low-voltage side of the distribution transformer;
(4) Establishing real-time zero sequence voltage average unbalance rateRAVVRecording real-time average unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer;
(5) Establishing real-time zero sequence voltage comprehensive unbalance rateRAZVRecording real-time comprehensive unbalance conditions of the three-phase voltages at the low-voltage side of the distribution transformer;
(6) Comprehensive unbalance rate according to real-time zero sequence voltageRAZVAnd a three-phase voltage unbalance rate limitRVZLAnd comprehensively evaluating the three-phase unbalance condition of the low-voltage side voltage of the distribution transformer.
Establishing real-time zero sequence voltage maximum unbalance rateRMZVThe real-time maximum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer is recorded, and the method specifically comprises the following steps:
wherein,,V 0 real-time zero sequence voltage value for low-voltage side of distribution transformer;V min is the smallest real-time voltage value of the three-phase load voltages on the low-voltage side A, B, C of the distribution transformer. Provision for provision ofV 0 AndV min at the same time, when the value is 0,RMZVis 0;V min is 0 toV 0 When the number of the organic light emitting diode is not 0,RMZVis-1.
Real-time zero sequence voltage value of low-voltage side of distribution transformerV 0 The method can be directly collected by a collecting device, if the zero sequence voltage collecting device is not provided, the method can be approximately calculated according to the three-phase voltage of the low-voltage side A, B, C of the distribution transformer, and the specific method comprises the following steps:
wherein,,V a 、V b 、V c the real-time voltage values of the three phases of the low-voltage side A, B, C of the distribution transformer are respectively obtained.
Establishing real-time zero sequence voltage minimum unbalance rateRNZVThe real-time minimum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer is recorded, and the real-time minimum unbalance condition is specifically as follows:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V max for maximum real-time voltage value in three-phase voltage of low-voltage side A, B, C of distribution transformer. Provision for provision ofV max AndV 0 at the same time, when the value is 0,RNZVis 0.
Establishing real-time zero sequence voltage rated unbalance rateRRZVThe real-time rated unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer is recorded, and the real-time rated unbalance condition is specifically as follows:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V N is the rated voltage value of the low-voltage side of the distribution transformer.
Establishing real-time zero sequence voltage average unbalance rateRAVVTo record the real-time average unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer, the method specifically comprises the following steps:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the three-phase voltages on the low-side A, B, C of the distribution transformer,V a 、V b 、V c the real-time voltage values of the three phases of the low-voltage side A, B, C of the distribution transformer are respectively obtained. Provision for provision ofV max AndV min at the same time, when the value is 0,RAVVis 0.
Establishing real-time zero sequence voltage comprehensive unbalance rateRAZVThe real-time comprehensive unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer is recorded, and the method specifically comprises the following steps:
wherein,,V 0 the realization method is as described above for the real-time zero sequence voltage value of the low-voltage side of the distribution transformer;V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min is the smallest real-time voltage value of the three-phase voltages on the low-voltage side A, B, C of the distribution transformer.
Comprehensive unbalance rate according to real-time zero sequence voltageRAZVAnd a three-phase voltage unbalance rate limitRVZLThe three-phase unbalance condition of the low-voltage side voltage of the distribution transformer is comprehensively evaluated, and specifically comprises the following steps:
(1) If the real-time zero sequence voltage comprehensive unbalance rate of a certain distribution transformerRAZVGreater than or equal to the three-phase voltage imbalance rate limitRVZLThe three-phase voltage at the low-voltage side of the distribution transformer is seriously unbalanced, and the unbalance degree is thatRAZV。
(2) If the real-time zero sequence voltage comprehensive unbalance rate of a certain distribution transformerRAZVLess than three-phase voltage unbalance rate limit valueRVZLAnd is not-1, the low-side three-phase voltage of the distribution transformer is in a balanced state.
(3) If the real-time zero sequence voltage comprehensive unbalance rate of a certain distribution transformerRAZVAnd is-1, the possibility of open phase exists at the low-voltage side of the distribution transformer.
Detailed description of preferred embodiments as shown in fig. 1, S1 is a substation outlet switch, A, B, C, D is a feeder line segment switch, DT1, DT2, DT3, and DT4 are distribution transformers, three-phase voltages at the low-voltage side A, B, C of each distribution transformer are shown in table 1, and the three-phase voltage unbalance rate limit values are shown in table 1RVZLThe distribution transformer low side rated voltage is 220V at 0.06.
The three-phase voltage on the DT2 low side A, B, C was analyzed as follows:
the zero sequence voltage estimation is: v (V) 0 =226.5-（203.1+215.3）/2=17.3
Real-time zero sequence voltage maximum unbalance rateRMZVThe method comprises the following steps:
RMZV=17.3/203.1=0.085
real-time zero sequence voltage minimum unbalance rateRNZV：
RNZV=17.3/226.5=0.076
Real-time zero sequence voltage rated unbalance rateRRZVThe method comprises the following steps:
RRZV=17.3/220=0.079
real-time zero sequence voltage average unbalance rateRAVV：
RAVV=17.3/214.966=0.08
Real-time zero sequence voltage comprehensive unbalance rateRAZVThe method comprises the following steps:
RAZV=(0.085+0.076+0.079+0.08)/4=0.08
according to the three-phase voltage unbalance rate limitRVVLA three-phase voltage on the low side of the distribution transformer can be determined to be severely unbalanced at 0.06. The three-phase voltage unbalance evaluation method of other distribution transformers is similar to the three-phase voltage unbalance evaluation method, and is not repeated.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a random access memory (RandomAccessMemory, RAM), or the like.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (2)
1. A distribution transformer low-voltage side voltage three-phase unbalance evaluation method based on zero sequence voltage is characterized by comprising the following steps of: the method comprises the following steps:
(1) Establishing a real-time zero sequence voltage maximum unbalance rate RMZV to record the real-time maximum unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer;
(2) Establishing a real-time zero sequence voltage minimum unbalance rate RNZV to record the real-time minimum unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer;
(3) Establishing a real-time zero sequence voltage rated unbalance rate RRZV to record the real-time rated unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer;
(4) Establishing a real-time zero sequence voltage average unbalance rate RAVV to record the real-time average unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer;
(5) Establishing a real-time zero sequence voltage comprehensive unbalance rate RAZV to record the real-time comprehensive unbalance condition of the three-phase voltage of the low-voltage side of the distribution transformer;
(6) Comprehensively evaluating the three-phase unbalance condition of the low-voltage side voltage of the distribution transformer according to the real-time zero sequence voltage comprehensive unbalance rate RAZV and the three-phase voltage unbalance rate limit RVZL;
specific:
wherein V is 0 Real-time zero sequence voltage value for low-voltage side of distribution transformer; v (V) max The maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer; v (V) min V, which is the smallest real-time voltage value of the three-phase voltage of the low-voltage side A, B, C of the distribution transformer N Rated voltage value of low-voltage side of distribution transformer, V a 、V b 、V c Real-time voltage values of three phases of the low-voltage side A, B, C of the distribution transformer respectively;
stipulating V 0 And V min At the same time, when the RMZV is 0; v (V) min Is 0 and V 0 When the RMZV is not 0, the RMZV is-1; v (V) max And V 0 At the same time, when the RNZV is 0; v (V) max And V min At the same time, when the ratio is 0, RAVV is 0;
real-time zero sequence voltage value V of low-voltage side of distribution transformer 0 The method is characterized in that the power distribution transformer is directly collected by a collection device, if no zero sequence voltage collection device exists, three-phase voltage is approximately calculated according to the low-voltage side A, B, C of the power distribution transformer, and the specific method is as follows:
wherein V is a 、V b 、V c The real-time voltage values of the three phases of the low-voltage side A, B, C of the distribution transformer are respectively obtained.
2. The zero sequence voltage-based distribution transformer low-voltage side voltage three-phase imbalance evaluation method according to claim 1, characterized by:
according to the real-time zero sequence voltage comprehensive unbalance rate RAZV and the three-phase voltage unbalance rate limit RVZL, comprehensively evaluating the three-phase unbalance condition of the low-voltage side voltage of the distribution transformer, specifically:
(1) If the real-time zero sequence voltage comprehensive unbalance rate RAZV of a certain distribution transformer is larger than or equal to the three-phase voltage unbalance rate limit RVZL, the three-phase voltage on the low-voltage side of the distribution transformer is seriously unbalanced, and the unbalance degree is RAZV;
(2) If the real-time zero sequence voltage comprehensive unbalance rate RAZV of a certain distribution transformer is smaller than the three-phase voltage unbalance rate limit RVZL and is not-1, the three-phase voltage of the low-voltage side of the distribution transformer is in a balanced state;
(3) If the real-time zero sequence voltage comprehensive unbalance rate RAZV of a certain distribution transformer is-1, the possibility of phase failure exists on the low-voltage side of the distribution transformer is indicated.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212967U (en) * | 1987-09-03 | 1988-06-08 | 河北省三河县商城股份有限公司 | Three phase unblanced power load measuring instrument |
| JPH0946934A (en) * | 1995-07-28 | 1997-02-14 | Meidensha Corp | Hdlc telecommunication slave station for distribution substation |
| CN103837752A (en) * | 2014-02-26 | 2014-06-04 | 广州供电局有限公司 | Method and system for monitoring three-phase imbalance of electric system |
| CN104407268A (en) * | 2014-11-27 | 2015-03-11 | 国家电网公司 | Abnormal electricity utilization judgment method based on abnormal analysis of electric quantity, voltage and current |
| CN106124826A (en) * | 2016-06-17 | 2016-11-16 | 华中科技大学 | A kind of mineral hot furnace working of a furnace digital management system, control method and monitoring device thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826726A (en) * | 2010-05-13 | 2010-09-08 | 余翔 | Three-phase load unbalanced limitation method and voltage-regulation type three-phase load unbalanced limiter |
| CN102916427B (en) * | 2012-09-25 | 2014-09-17 | 广东电网公司电力科学研究院 | Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines |
| ES2544902B8 (en) * | 2014-12-11 | 2016-02-12 | Universitat Politècnica De València | Method and system for measuring imbalances in a power grid |
| JP6468953B2 (en) * | 2015-06-11 | 2019-02-13 | 一般財団法人電力中央研究所 | Connection phase determination method, determination device, and determination program |
| CN107748300A (en) * | 2017-09-27 | 2018-03-02 | 西安索普电气技术有限公司 | A kind of tri-phase unbalance factor detection method based on improvement S-transformation |
-
2018
- 2018-05-17 CN CN201810475182.6A patent/CN108414821B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212967U (en) * | 1987-09-03 | 1988-06-08 | 河北省三河县商城股份有限公司 | Three phase unblanced power load measuring instrument |
| JPH0946934A (en) * | 1995-07-28 | 1997-02-14 | Meidensha Corp | Hdlc telecommunication slave station for distribution substation |
| CN103837752A (en) * | 2014-02-26 | 2014-06-04 | 广州供电局有限公司 | Method and system for monitoring three-phase imbalance of electric system |
| CN104407268A (en) * | 2014-11-27 | 2015-03-11 | 国家电网公司 | Abnormal electricity utilization judgment method based on abnormal analysis of electric quantity, voltage and current |
| CN106124826A (en) * | 2016-06-17 | 2016-11-16 | 华中科技大学 | A kind of mineral hot furnace working of a furnace digital management system, control method and monitoring device thereof |
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