CN114840803A - Calculation method for switching qualification rate of reactive compensation equipment - Google Patents
Calculation method for switching qualification rate of reactive compensation equipment Download PDFInfo
- Publication number
- CN114840803A CN114840803A CN202210659300.5A CN202210659300A CN114840803A CN 114840803 A CN114840803 A CN 114840803A CN 202210659300 A CN202210659300 A CN 202210659300A CN 114840803 A CN114840803 A CN 114840803A
- Authority
- CN
- China
- Prior art keywords
- switching
- reactive
- compensation equipment
- switching action
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012797 qualification Methods 0.000 title claims abstract description 28
- 238000004364 calculation method Methods 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007418 data mining Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Data Mining & Analysis (AREA)
- General Physics & Mathematics (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Optimization (AREA)
- Algebra (AREA)
- Computational Mathematics (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Analysis (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a method for calculating the switching qualification rate of reactive compensation equipment. The method comprises the following steps: calculating a reactive power natural value and a variation value; providing a reactive compensation equipment actual switching action criterion based on a reactive variation value; providing an ideal switching action criterion of the reactive compensation equipment based on the power out-of-limit condition and switching effectiveness; and defining the daily switching action qualification rate and the average switching action qualification rate of the reactive compensation equipment based on the actual switching action criterion and the ideal switching action criterion, and quantifying the switching action performance of the equipment. The invention can realize the switching state identification of the reactive power compensation equipment of the power distribution network.
Description
Technical Field
The invention relates to a method for calculating the switching qualification rate of reactive compensation equipment.
Background
Reactive power compensation is a technology which plays a role in improving the power factor of a power grid in an electric power supply system, reduces the loss of a power supply transformer and a transmission line, improves the power supply efficiency and improves the power supply environment. In a power distribution network, reactive compensation is generally performed on the power consumption side using a low-voltage reactive compensation device composed of a plurality of capacitors and installed on the low-voltage side of a distribution transformer. Along with the rapid increase of economy and the continuous increase of power load in China, the requirements of users on the quality of electric energy are increasingly improved, the importance of reactive power optimization compensation of a power distribution network is increasingly enhanced, and the difficulty of reactive power regulation is increasingly increased. The reactive reasonable distribution of the power system guarantees the voltage quality and reduces the precondition of network loss, even the material basis for ensuring the voltage stability of the power system, so the reactive compensation is one of the core works of the power system control. However, when the dynamic reactive power compensation equipment is found to have faults that the capacitor bank is abnormally switched off and off frequently in the daily patrol work of each power supply bureau in the region, the reactive power compensation device cannot play a normal role, and therefore the normal power utilization of users and the high-quality service level of the power supply bureau in the region are influenced. Therefore, it is necessary to evaluate the qualification rate of the switching operation of the reactive power compensation equipment.
For reactive compensation equipment, the switching action of the novel electronic switch reactive compensation equipment depends on the operation data of the low-voltage side of a distribution transformer, including single-phase/three-phase active power, single-phase/three-phase reactive power, single-phase/three-phase power factor and single-phase/three-phase voltage, the novel electronic switch reactive compensation equipment can also acquire the real-time information state of the switching action, but some areas still use the mechanical switch installed in the early stage, and do not have the function of collecting and storing the switch action information, at present, no related method is available for identifying the switching state of the reactive compensation equipment, and if the traditional manual comparison and investigation method is used, the number of the reactive compensation equipment of the power distribution network is large, so that the method is time-consuming, labor-consuming and has no timeliness, and switching action is a transient process, and is difficult to analyze from the body level of the equipment. Therefore, it is necessary to develop a method based on operation data mining to determine the switching operation time of the reactive power compensation equipment, so as to quantify the performance of the reactive power compensation equipment.
Disclosure of Invention
The invention aims to provide a method for calculating the switching qualification rate of reactive compensation equipment aiming at the problem that the switching state of the reactive compensation equipment of a power distribution network is difficult to identify, provides an actual switching action criterion of the equipment, and then provides an ideal switching action criterion of the equipment so as to quantize the switching action performance.
In order to realize the purpose, the technical scheme of the invention is as follows: a method for calculating the switching qualification rate of reactive compensation equipment comprises the following steps:
s1, providing a reactive compensation equipment actual switching action criterion based on the reactive variation value;
s2, providing ideal switching action criteria of the reactive compensation equipment based on power out-of-limit conditions and switching effectiveness;
and S3, defining the daily switching action qualification rate and the average switching action qualification rate of the reactive compensation equipment based on the actual switching action criterion and the ideal switching action criterion of the reactive compensation equipment, and quantifying the switching action performance of the reactive compensation equipment.
In an embodiment of the present invention, in step S1, the actual switching action criteria of the reactive compensation equipment are as follows:
wherein, Δ Q is a variation value of reactive power at the sampling time t, and Δ Q is Q-Q'; q' is the natural value of the reactive power at the sampling instant t,
q is the actual value of the reactive power at the sampling instant t,
p is the actual value of the active power at the sampling moment t;
is the natural power factor at the previous moment;
is the natural power factor at the sampling time t; minQ c The minimum switching capacity is used for the capacitor bank.
In an embodiment of the present invention, in step S2, the ideal switching action criteria of the reactive power compensation device are as follows:
wherein the content of the first and second substances,
is the natural power factor at the sampling time t;
a lower compensation limit of the power factor set for delivery;
compensating an upper limit for a power factor set for delivery; minQ c The minimum switching capacity of the capacitor bank; p is the actual value of the active power at the sampling moment t; q' is the natural value of the reactive power at the sampling instant t,
is the natural power factor at the previous moment;
the above formula integrates the power factor out-of-limit condition and the switching effective judgment condition to provide an ideal switching action criterion of the reactive compensation equipment; the power factor out-of-limit condition ensures that the equipment should act when the situation that the reactive power is unqualified is monitored; the switching effective conditions ensure the effectiveness of switching actions, and if the power factor after compensating the capacitor with the minimum capacity exceeds the upper limit, reactive compensation equipment is not required to be put into use; similarly, if the power factor after the minimum capacitor is cut off is lower, the reactive power compensation equipment should not be cut off.
In an embodiment of the present invention, step S3 is implemented as follows:
in order to evaluate the switching action of the reactive compensation equipment, the reactive compensation equipment needs to be quantized; judging a reactive compensation equipment sample set according to an actual switching action criterion of the reactive compensation equipment and an ideal switching action criterion of the reactive compensation equipment: d ═ D 1 ,D 2 ,...D M Actual day switching action, time switching action and ideal day switching action of all reactive compensation equipment in the station,Switching action at any moment; comparing the actual switching action and the ideal switching action of each reactive compensation device in the sample set on the same day and at the same moment one by one, if the actual switching action and the ideal switching action are in the same state, considering that the switching action at the moment is qualified, and if the actual switching action and the ideal switching action are not the same, considering that the switching action at the moment is unqualified;
defining reactive compensation devices D i The daily switching qualification rate of the method is as follows:
likewise, an average switching qualification rate of the reactive compensation equipment in a certain time is defined.
Compared with the prior art, the invention has the following beneficial effects: the method defines the daily switching action qualification rate and the average switching action qualification rate of the reactive compensation equipment based on the actual switching action criterion and the ideal switching action criterion, and quantifies the switching action performance of the reactive compensation equipment; the invention can realize the switching state identification of the reactive power compensation equipment of the power distribution network.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
As shown in fig. 1, the method for calculating the switching qualification rate of the reactive compensation equipment includes:
s1, providing a reactive compensation equipment actual switching action criterion based on the reactive variation value;
s2, providing ideal switching action criteria of the reactive compensation equipment based on power out-of-limit conditions and switching effectiveness;
and S3, defining the daily switching action qualification rate and the average switching action qualification rate of the reactive compensation equipment based on the actual switching action criterion and the ideal switching action criterion of the reactive compensation equipment, and quantifying the switching action performance of the reactive compensation equipment.
The following is a specific embodiment of the present invention.
Aiming at the problem that the switching state of the reactive compensation equipment of the power distribution network is difficult to identify, a calculation method according to operation data is provided, the actual switching action criterion of the equipment is provided, and then the ideal switching action criterion of the equipment is provided, so that the switching action performance is quantized, and the method is as follows.
1. And (4) judging the actual switching action of the reactive compensation equipment. According to the actual load characteristics, the active component of the conventional power load is generally far greater than the reactive component, so that the fluctuation of the power factor is not very severe in the non-fault condition, and the allowable fluctuation range of the power factor of the power consumer is specified by the power system voltage and reactive power technology guideline. Therefore, the change of the power factor should be smooth or not have large abrupt change on the general premise that the load does not change sharply (generally caused by system fault) in the adjacent sampling time. In fact, the reactive compensation equipment is put into operation, resulting in a power factor correction that is greater in magnitude than the natural variation of the power factor.
Let the sampling time t 1 The operating data is P 1 、Q 1 、
The next sampling instant t 2 Has operating data of P 2 、Q 2 、
Defining:
Q′ 2 is t 2 The natural value of the reactive power at a time generally tends to be stable due to the natural power factor at adjacent times under non-fault conditions, i.e.
And due to the fact that
So that formula (1) is represented by t 1 Power factor at time t 2 Calculated value of power factor at time, calculated t 2 Time natural value Q' 2 Should be compared with the actual value Q 2 The phase difference is not large. If t 2 The power factor is greatly changed from the previous moment due to the switching action of the reactive compensation equipment at the moment
Calculating to obtain a natural value Q' 2 Will be compared with the actual value Q 2 Variation, definition:
ΔQ＝Q 2 -Q′ 2 (2)
Δ Q is t 2 The variation value of the reactive power at the moment. The above analysis shows that the variation may be caused by natural power variation, and since the correction amplitude of the reactive compensation equipment to the power factor is generally larger than the natural variation amplitude of the reactive compensation equipment without the compensation equipment, the threshold condition of the variation value is added as the actual switching action criterion of the reactive compensation equipment. When the equipment acts, the size of the variation value meets the minimum value minQ which is larger than the switching capacity of the capacitor bank c When the capacitor set is put in, the delta Q should be less than 0, and when the capacitor set is cut off, the delta Q should be more than 0. Therefore, the actual switching criterion of the reactive equipment is provided:
2. and (4) judging the ideal switching action of the reactive compensation equipment. And analyzing whether the equipment is switched at a specific moment or not by combining the factory setting of the equipment and the reactive voltage operation guide rule requirement, and using the analyzed result as a reference for judging the switching action of the equipment. Setting the sampling time t as P, Q,
Calculating to obtain a natural value Q' according to the data of the previous time, and the minimum switching capacity of the capacitor bank is minQ c Factory set lower limit of power factor compensation
The upper limit is
And (3) providing an ideal switching action criterion of the equipment as a switching action reference standard of the equipment:
the formula (4) integrates the power factor out-of-limit condition and the switching effective judgment condition to provide the ideal switching action criterion of the equipment. The power factor out-of-limit condition ensures that the equipment should act when the situation that the reactive power is unqualified is monitored; the switching effective condition ensures the effectiveness of the switching action, and if the upper limit situation of the power factor after compensating the minimum capacity exists, the power factor is not required to be switched; similarly, if the lower the power factor after the minimum capacitor is cut off, it should not be cut off. Since the operation data Q is the reactive power after compensation, and the participation in switching effectiveness calculation may cause repeated calculation of switching capacity and influence judgment, the criterion uses a reactive power natural value Q' to replace Q as a criterion parameter.
3. And the switching action performance of the reactive compensation equipment is quantized. In order to evaluate the switching action of the reactive power compensation equipment, the switching action needs to be quantified. Judging a device sample set according to the criterion: d ═ D 1 ,D 2 ,...D M And actual day and time switching actions and ideal day and time switching actions of all equipment in the station are calculated. And comparing the actual switching action and the ideal switching action of each device in the sample set on the same day and at the same moment one by one, if the actual switching action and the ideal switching action are in the same state (no action, input and cut), determining that the switching action at the moment is qualified, and if the actual switching action and the ideal switching action are not the same, determining that the switching action at the moment is unqualified.
Definition device D i The daily switching qualification rate of the method is as follows:
likewise, the average switching qualification rate of the equipment in a period of time can be defined, and accidental errors can be avoided.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (4)
1. A method for calculating the switching qualification rate of reactive compensation equipment is characterized by comprising the following steps:
s1, providing a reactive compensation equipment actual switching action criterion based on the reactive variation value;
s2, providing ideal switching action criteria of the reactive compensation equipment based on power out-of-limit conditions and switching effectiveness;
and S3, defining the daily switching action qualification rate and the average switching action qualification rate of the reactive compensation equipment based on the actual switching action criterion and the ideal switching action criterion of the reactive compensation equipment, and quantifying the switching action performance of the reactive compensation equipment.
2. The method for calculating the switching qualification rate of the reactive power compensation equipment according to claim 1, wherein in step S1, the actual switching action criteria of the reactive power compensation equipment are as follows:
wherein, Δ Q is a variation value of reactive power at the sampling time t, and Δ Q is Q-Q'; q' is the natural value of the reactive power at the sampling instant t,
q is the actual value of reactive power at the sampling instant t,
p is the actual value of the active power at the sampling moment t;
is the natural power factor at the previous moment;
is the natural power factor at the sampling time t; minQ c The minimum switching capacity of the capacitor bank.
3. The method for calculating the switching qualification rate of the reactive power compensation equipment according to claim 1, wherein in step S2, the ideal switching action criteria of the reactive power compensation equipment are as follows:
wherein the content of the first and second substances,
is the natural power factor at the sampling time t;
a lower compensation limit of the power factor set for delivery;
compensating an upper limit for a power factor set for delivery; minQ c The minimum switching capacity of the capacitor bank; p is the actual value of the active power at the sampling moment t; q' is the natural value of the reactive power at the sampling instant t,
is the natural power factor at the previous moment;
the above formula integrates the power factor out-of-limit condition and the switching effective judgment condition to provide an ideal switching action criterion of the reactive compensation equipment; the power factor out-of-limit condition ensures that the equipment should act when the situation that the reactive power is unqualified is monitored; the switching effective conditions ensure the effectiveness of switching actions, and if the power factor after compensating the capacitor with the minimum capacity exceeds the upper limit, reactive compensation equipment is not required to be put into use; similarly, if the power factor after the minimum capacitor is cut off is lower, the reactive power compensation equipment should not be cut off.
4. The method for calculating the switching qualification rate of the reactive compensation equipment according to claim 1, wherein the step S3 is implemented as follows:
in order to evaluate the switching action of the reactive compensation equipment, the reactive compensation equipment needs to be quantized; judging a reactive compensation equipment sample set according to an actual switching action criterion of the reactive compensation equipment and an ideal switching action criterion of the reactive compensation equipment: d ═ D 1 ,D 2 ,...D M Actual day switching actions, moment switching actions, ideal day switching actions and moment switching actions of all reactive compensation equipment in the station are calculated; comparing the actual switching action and the ideal switching action of each reactive compensation device in the sample set on the same day and at the same moment one by one, if the actual switching action and the ideal switching action are in the same state, considering that the switching action at the moment is qualified, and if the actual switching action and the ideal switching action are not the same, considering that the switching action at the moment is unqualified;
defining reactive compensation devices D i The daily switching qualification rate of the method is as follows:
likewise, an average switching qualification rate of the reactive compensation equipment in a certain time is defined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210659300.5A CN114840803B (en) | 2022-06-10 | Calculation method for switching qualification rate of reactive power compensation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210659300.5A CN114840803B (en) | 2022-06-10 | Calculation method for switching qualification rate of reactive power compensation equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114840803A true CN114840803A (en) | 2022-08-02 |
| CN114840803B CN114840803B (en) | 2024-07-02 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300550A (en) * | 2014-09-19 | 2015-01-21 | 国家电网公司 | Method for analyzing switching of low-voltage reactive power compensation capacitor |
| CN105811431A (en) * | 2016-03-17 | 2016-07-27 | 国网浙江省电力公司湖州供电公司 | Automatic reactive compensation switching control method |
| CN112421774A (en) * | 2020-10-29 | 2021-02-26 | 深圳供电局有限公司 | Monitoring system of distribution network reactive compensation equipment |
| CN114156901A (en) * | 2021-11-25 | 2022-03-08 | 国网福建省电力有限公司莆田供电公司 | Method for detecting state abnormity of low-voltage distribution transformer reactive power compensation device |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300550A (en) * | 2014-09-19 | 2015-01-21 | 国家电网公司 | Method for analyzing switching of low-voltage reactive power compensation capacitor |
| CN105811431A (en) * | 2016-03-17 | 2016-07-27 | 国网浙江省电力公司湖州供电公司 | Automatic reactive compensation switching control method |
| CN112421774A (en) * | 2020-10-29 | 2021-02-26 | 深圳供电局有限公司 | Monitoring system of distribution network reactive compensation equipment |
| CN114156901A (en) * | 2021-11-25 | 2022-03-08 | 国网福建省电力有限公司莆田供电公司 | Method for detecting state abnormity of low-voltage distribution transformer reactive power compensation device |
Non-Patent Citations (1)
| Title |
|---|
| 张俊敏;周小波;汤晓伟;许敏;: "基于典型日负荷曲线的变电站无功补偿优化分析系统", 上海电力, no. 06, 10 January 2008 (2008-01-10), pages 587 - 589 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102097805B (en) | Optimization decision method for comprehensive energy-saving and loss-reducing technology of urban and rural distribution network | |
| CN111564898A (en) | Multifunctional intelligent control system based on intelligent electric meter | |
| CN109447465B (en) | Power distribution network planning scheme evaluation method based on collaborative optimization efficiency coefficient | |
| CN111049149B (en) | Power grid terminal low voltage treatment method | |
| CN103065265A (en) | Identification method based on PQ View data source for power quality disruption type | |
| CN110490405A (en) | A kind of transformer energy efficiency evaluation analysis system | |
| CN111817299B (en) | Fuzzy reasoning-based intelligent identification method for line loss rate abnormal cause of power distribution station | |
| CN105678641A (en) | Energy-saving data processing method and device for power distribution network | |
| CN111293692A (en) | Optimization method for reducing line loss of power distribution network | |
| CN101931237A (en) | Method for appraising voltage reactive configuring and running status of high-voltage electric distribution network | |
| CN114840803A (en) | Calculation method for switching qualification rate of reactive compensation equipment | |
| CN105404933A (en) | Computing system for enhancing power supply reliability for power distribution network and computing method thereof | |
| CN114840803B (en) | Calculation method for switching qualification rate of reactive power compensation equipment | |
| CN104767281B (en) | A kind of high voltage distribution network topological Simplification method | |
| CN111753245B (en) | Method for calculating maximum energy saving amount under condition of fixed action times of capacity-regulating distribution transformer | |
| CN115566693A (en) | Load frequency modulation capacity evaluation method based on active-voltage coupling characteristic | |
| WO2021036248A1 (en) | Energy-saving circuit structure capable of automatically balancing active currents in three phases and control method | |
| Santilio et al. | A computational and experimental performance analysis of an electromagnetic voltage regulator proposal throughout controlled series voltage injection | |
| CN203883477U (en) | Stepping type voltage regulator | |
| CN110611316B (en) | Method, system and medium for improving voltage qualification rate of 400V low-voltage user | |
| CN108718088B (en) | On-load voltage and capacity regulating distribution transformer replacement judgment method and decision system | |
| CN109659951B (en) | Grouping method and system for reactive compensation capacitors of distribution transformer | |
| CN111796143A (en) | Energy-saving metering method for energy-saving equipment of power distribution and utilization system | |
| CN112003287A (en) | Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid | |
| CN109004672A (en) | A method of improving rural power grids small power station grid entry point quality of voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |