CN108899914B - A kind of pre- operation/cutting method of intelligent capacitor based on distribution output load feature - Google Patents
A kind of pre- operation/cutting method of intelligent capacitor based on distribution output load feature Download PDFInfo
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- CN108899914B CN108899914B CN201810660304.9A CN201810660304A CN108899914B CN 108899914 B CN108899914 B CN 108899914B CN 201810660304 A CN201810660304 A CN 201810660304A CN 108899914 B CN108899914 B CN 108899914B
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- output load
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- 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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- 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
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to on-line checkings and control technology, more particularly to a kind of pre- operation/cutting method of intelligent capacitor based on distribution output load feature, pass through hardware data acquisition, data analysis is completed on the basis of distribution output load characteristic identifies knowledge base by system software, switching control instruction and code are provided, is acted by the various switchings that switching device completes intelligent power capacitor.This method is able to achieve the compensation that power is carried out according to the characteristic of low-voltage distribution load, the investment pre-cut of intelligent capacitor is fast and accurately completed using pre-cast incision technology simultaneously, shorten the switching time, realizes precisely compensation, provide effective reference for distribution intelligent powerless compensation technology.
Description
Technical field
The invention belongs to on-line checking and control technology field more particularly to a kind of intelligence based on distribution output load feature
It can the pre- operation/cutting method of capacitor.
Background technique
In the low pressure 10kV distribution system in China, the mode of reactive compensation is generallyd use to carry out the tune of terminal voltage
Section guarantees supply voltage, while reducing the electric current output of distribution transformer, is made with playing certain protection to route and equipment
With.Reactive compensation generally uses power capacitor as reacance generator, and generation is idle to achieve the effect that reactive power source.And electricity
It is adjustment target that the switching of appearance, which is typically all with power factor (PF), under the premise of guaranteeing that output end voltage is stablized, adjustment electric power electricity
The quantity of the operating status of container and investment is adjusted power factor (PF), under normal circumstances the transformation of 1250kVA capacity
The total amount that device configures compensating electric capacity is 360kvar.But in process of distributing electricity, not all capacitor all simultaneously investment or
Excision, but determine specific switching numerical value as needed, and it is anti-merely to determine that capacitor switching has according to power factor (PF)
Answer speed slow, the low disadvantage of compensation precision, it is therefore proposed that novel intelligent capacitor operation/cutting method has a very important significance.
Then traditional capacitor switching method judges using first detecting, finally just the mode of switching completes compensating movement,
Have the shortcomings that reaction speed is slow, compensation precision is low and compensation lag.The switching of capacitor is all and single with power factor (PF) at present
For reference, the characteristic and load changing rate problem of output load are not accounted for, is consequently belonging to a kind of mode for lagging switching.
Summary of the invention
The object of the present invention is to provide it is a kind of according to part throttle characteristics and output load characteristic and load type targetedly into
The method of the intelligent operation/cutting of row electric capacitor.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of intelligence based on distribution output load feature
The pre- operation/cutting method of capacitor, by hardware data acquisition, by system software distribution output load property database base
Data analysis is completed on plinth, provides switching control instruction and code, and the various of intelligent power capacitor are completed by switching device
Switching movement；Specifically includes the following steps:
Step 1, acquisition distribution transformer low-pressure side voltage current data in actual use and user power utilization load
Type cases establish distribution output load property database；
Step 2, current transformer and intelligent acquisition and detection device on low-voltage distribution busbar voltage, current signal into
Row monitoring in real time is stored with acquisition；
Step 3, when reach storage the period after, by the data for being stamped timestamp pass through band shielding communication cable be transferred to synthesis
Monitoring device is analyzed and determined；
Step 4, integrated monitoring apparatus analyze data, obtain power factor (PF), and phase angle difference and distribution output load are special
Linearity curve；
Step 5 is judged according to the distribution output load property database being previously obtained, and is obtained control instruction, is controlled
The pre- investment of intelligent power capacitor, investment, pre-cut, excision movement.
In the above-mentioned pre- operation/cutting method of intelligent capacitor based on distribution output load feature, distribution output load characteristic quantity
According to library foundation the following steps are included:
If step 1.1, power factor (PF)Less than setting value and phase difference ω t+ Φ is greater than 0, then current system compensates not
Perception is presented in the load of foot, system, needs to put into capacitor；
If step 1.2, power factor (PF)Less than setting value and phase difference ω t+ Φ is less than 0, then current system compensates not
Capacitive is presented in the load of foot, system, needs to put into capacitor in advance, i.e. investment partition capacitance；
If step 1.3, power factor (PF)It is greater than the set value and phase difference ω t+ Φ is greater than 0, then current system compensation is super
It crosses, capacitive is presented in the load of system, needs to cut off capacitor；
If step 1.4, power factor (PF)It is greater than the set value and phase difference ω t+ Φ is less than 0, then current system compensation is super
It crosses, perception is presented in the load of system, needs to carry out pre-cut, i.e. cut-out capacitor to capacitor；
If step 1.5, phase difference ω t+ Φ are equal to 0 and power factor (PF)More than or less than setting value, then current system
Not up to or be more than offset, the load of system presents resistive, needs to carry out part excision or investment to capacitor for compensation, make be
The power factor (PF) of system is maintained in the power factor (PF) value of setting.
The invention has the benefit that the present invention is able to achieve the compensation that power is carried out according to the characteristic of low-voltage distribution load,
The investment pre-cut for fast and accurately completing intelligent capacitor using pre-cast incision technology simultaneously, shortens the switching time, realizes accurate
Compensation, provides effective reference for distribution intelligent powerless compensation technology.
Detailed description of the invention
Fig. 1 is a kind of stream of the pre- operation/cutting method of intelligent capacitor based on distribution output load feature of one embodiment of the invention
Cheng Tu；
Fig. 2 is integrated monitoring apparatus calculation process and the logic analysis tree of one embodiment of the invention；
Fig. 3 is the hardware device connection figure and control structure figure of one embodiment of the invention；
Wherein, 1- low-voltage distribution busbar, 2- current transformer, 3- coaxial radio frequency cable, 4- low-pass filter, 5- busbar
Binding post, 6- band shielded cable, 7- intelligent acquisition and detection device, 8- integrated monitoring apparatus, 9- intelligent power capacitor, 10-
Switching device.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
The present embodiment can realize the comprehensive monitoring and the pre- switching of intelligence of power transformer low-voltage busbar output end reactive compensation
Technology targetedly carries out the intelligent operation/cutting of electric capacitor, and energy according to part throttle characteristics and output load characteristic and load type
Pre- investment is carried out to act with pre-cut.By detecting obtained voltage, current signal carries out the calculating of power factor (PF) and phase difference
Analysis obtains switching needs and load type, while predicting changing rule according to the historical data of record, fulfils pre-cast ahead of schedule
Cut movement, shorten the compensation time, improve compensation efficiency and precision, be device low manufacture cost designed by the present embodiment method but
Structure and runnability are high, and degree of intelligence is high, realize the timeliness and accuracy compensation of reactive power, can save manpower, object
Power, financial resources, mounting means is simple and easy, and it can be other kinds of reactive compensating capacitor method and dress that method practicability is high
Offer effectively reference is provided.
What the present embodiment was achieved through the following technical solutions: for the intelligent capacitor pre-cast based on distribution output load feature
The device of blanking method, as shown in Figure 3, comprising: in the distribution transformer low-pressure side setting intelligent acquisition and detection device monitored
7, a set of intelligent acquisition of every matched transformer and detection device are filled with three high precision current transformers 2 and three low-pass filtering
Set 4.Intelligent acquisition will be acquired with detection device 7 and calculation result data is transferred to integrated monitoring apparatus 8:
Intelligent acquisition and detection device 7 (sample rate 1k/s), high-precision are set on distribution transformer low-voltage distribution busbar
Current transformer 2, high precision current transformer 2 are stuck on every phase low-voltage distribution busbar 1 using rectangular clamp, and high-precision current is mutual
Sensor 2 is connect by coaxial radio frequency cable 3 with intelligent acquisition with detection device 7, real-time on low-voltage distribution busbar 1 for acquiring
Current value.
Wiring bus bar column 5 by connecting low-voltage distribution busbar 1 with shielded cable acquires busbar voltage U, is transferred to intelligence
Acquisition and detection device 7.
Intelligent acquisition and detection device 7 are passed data using the progress data calculating of fixed cycle triggering mode and storage
It is defeated to arrive integrated monitoring apparatus 8.
Integrated monitoring apparatus 8 carries out signature analysis to the data received and calculates, and obtains power factor (PF), with electricity output spy
Property, according to the Rule of judgment being previously set, control signal is issued to switching device 10.
Switching device 10 receives the control signal of integrated monitoring apparatus 8, carries out the investment and excision of intelligent power capacitor
And switching state is fed back to integrated monitoring apparatus 8.
The working principle of the present embodiment device is as follows:
1) high precision current transformer and intelligent acquisition and detection device are installed on distribution transformer low-voltage distribution busbar,
Therebetween it is connected using coaxial radio frequency cable, for acquiring the real-time current voltage value on low-voltage distribution busbar；2) intelligence is adopted
Collection is stored with detection device records low-voltage distribution busbar voltage, current value and calculated load characteristic, power factor (PF) equivalence；3)
After intelligent acquisition and detection device storing data reach 2 cycles, the data of storage are transferred to integrated monitoring apparatus and are analyzed
It is identified with output characteristics；4) integrated monitoring apparatus outputs a control signal to switching device according to the result of analytical calculation, controls intelligence
The switching of energy power capacitor, while compression is carried out with control data to this acquisition and is stored into database.
As shown in Figure 1, a kind of pre- operation/cutting method of intelligent capacitor based on distribution output load feature of the present embodiment, by hard
Part data acquisition is completed data analysis on the basis of distribution output load property database by system software, provided
Switching control instruction and code are acted by the various switchings that Intelligent switching device completes power capacitor；Steps are as follows:
(1) distribution transformer low-pressure side voltage current data and user power utilization load type in actual use is acquired
Situation establishes distribution output load property database；
(2) current transformer and intelligent acquisition and detection device carry out voltage, the current signal on low-voltage distribution busbar
Monitoring in real time is stored with acquisition；
(3) after reaching the storage period, the data for being stamped timestamp is shielded into communication cable by band and are transferred to comprehensive prison
Control device is analyzed and determined；
(4) integrated monitoring apparatus analyzes data, obtains power factor (PF), and phase angle difference and distribution output load characteristic are bent
Line；
(5) judged according to the distribution output load property database being previously obtained, obtain control instruction, control intelligence
The pre- investment of capacitor, investment, pre-cut, excision movement.
It is acquired by data and establishes distribution output load property database according to analysis mode:
If I. power factor (PF)Less than setting value and phase difference ω t+ Φ is greater than 0, then illustrates current system compensation not
Perception is presented in the load of foot, simultaneity factor, needs to put into capacitor.
If II. power factor (PF)Less than setting value and phase difference ω t+ Φ is less than 0, then illustrates current system compensation not
Capacitive is presented in the load of foot, simultaneity factor, needs to put into capacitor in advance, i.e., only puts into partition capacitance.
If III. power factor (PF)It is greater than the set value and phase difference ω t+ Φ is greater than 0, then illustrate that current system compensation is super
It crosses, capacitive is presented in the load of simultaneity factor, needs to cut off capacitor.
If IV. power factor (PF)It is greater than the set value and phase difference ω t+ Φ is less than 0, then illustrate that current system compensation is super
It crosses, perception is presented in the load of simultaneity factor, needs to carry out pre-cut, i.e. cut-out capacitor to capacitor.
If V. phase difference ω t+ Φ is equal to 0 and power factor (PF)More than or less than setting value, then illustrate that current system is mended
It repays not up to or more than offset, the load presentation of simultaneity factor is resistive, needs to carry out part excision or investment to capacitor, make
The power factor (PF) of system is maintained in the power factor (PF) value of setting.
When it is implemented, a kind of pre- operation/cutting method of intelligent capacitor based on distribution output load feature, including walk as follows
It is rapid:
1, the three-phase current on high precision current transformer acquisition low-voltage distribution busbar, is transferred to by coaxial radio frequency cable
Low-pass filter.
2, low-pass filter is filled into the High-frequency Interference in three-phase current signal and is believed using fixed integrating circuit
Number, including discharge pulse, radio wave, radio frequency communication signal etc..
3, the three-phase current signal after low-pass filtering is transferred to intelligent acquisition and inspection again by coaxial radio frequency cable
Survey device.
4, the voltage signal on low-voltage distribution busbar passes through band shielded cable using the connection type of wiring bus bar column and transmits
To intelligent acquisition and detection device.
5, the electric current received, voltage signal are carried out compression storage with detection device by intelligent acquisition together with timestamp.
6, after voltage and current storage signal reaches 2 cycles, intelligent acquisition and detection device lead to the signal of compression storage
It crosses communication cable and is transferred to integrated monitoring apparatus.
7, integrated monitoring apparatus is calculated and is analyzed to the voltage and current signal comprising timestamp.
8, as shown in Fig. 2, it is defeated to calculate current low-voltage busbar first according to the voltage and current signals data for being stamped timestamp
Power factor (PF) on load outAnd the phase difference ω t+ Φ of voltage signal and current signal.
9, the power factor (PF) being calculated is compared with the preset power factor (PF) value of system.
10, the phase difference being calculated is compared with 0.
If 11, power factor (PF)Less than setting value and phase difference ω t+ Φ is greater than 0, then illustrates current system compensation not
Perception is presented in the load of foot, simultaneity factor, needs to put into capacitor.
If 12, power factor (PF)Less than setting value and phase difference ω t+ Φ is less than 0, then illustrates current system compensation not
Capacitive is presented in the load of foot, simultaneity factor, needs to put into capacitor in advance, i.e., only puts into partition capacitance.
If 13, power factor (PF)It is greater than the set value and phase difference ω t+ Φ is greater than 0, then illustrate that current system compensation is super
It crosses, capacitive is presented in the load of simultaneity factor, needs to cut off capacitor.
If 14, power factor (PF)It is greater than the set value and phase difference ω t+ Φ is less than 0, then illustrate that current system compensation is super
It crosses, perception is presented in the load of simultaneity factor, needs to carry out pre-cut, i.e. cut-out capacitor to capacitor.
If 15, phase difference ω t+ Φ is equal to 0 and power factor (PF)More than or less than setting value, then illustrate current system
Not up to or more than offset, the load presentation of simultaneity factor is resistive for compensation, needs to carry out part excision or investment to capacitor,
It is maintained at the power factor (PF) of system in the power factor (PF) value of setting.
16, integrated monitoring apparatus obtains switching movement and the numerical value of intelligent power capacitor according to above-mentioned analysis, will correspond to
Instruction becomes fling-cut switch movement and is transferred to switching device.
17, after switching device receives the switching signal that integrated monitoring apparatus provides, corresponding switching order is executed, it is right
Reactive power on low-voltage distribution busbar is adjusted.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (1)
1. a kind of pre- operation/cutting method of intelligent capacitor based on distribution output load feature, characterized in that complete data by hardware
Data analysis is completed in acquisition by system software on the basis of distribution output load property database, is provided switching control and is referred to
Order and code pass through the various switchings movement that switching device completes intelligent power capacitor；Specifically includes the following steps:
Step 1, acquisition distribution transformer low-pressure side voltage current data in actual use and user power utilization load type
Situation establishes distribution output load property database；
Step 2, current transformer and intelligent acquisition and detection device carry out voltage, the current signal on low-voltage distribution busbar real
When monitoring and acquisition store；
Step 3, when reach storage the period after, by the data for being stamped timestamp pass through band shielding communication cable be transferred to comprehensively monitoring
Device is analyzed and determined；
Step 4, integrated monitoring apparatus analyze data, obtain power factor (PF), and phase angle difference and distribution output load characteristic are bent
Line；
Step 5 is judged according to the distribution output load property database being previously obtained, and obtains control instruction, control intelligence
The pre- investment of power capacitor, investment, pre-cut, excision movement；
The foundation of distribution output load property database the following steps are included:
If step 1.1, power factor (PF)Less than setting value and phase difference ω t+ Φ is greater than 0, then current system compensation is insufficient, is
Perception is presented in the load of system, needs to put into capacitor；
If step 1.2, power factor (PF)Less than setting value and phase difference ω t+ Φ is less than 0, then current system compensation is insufficient,
Capacitive is presented in the load of system, needs to put into capacitor in advance, i.e. investment partition capacitance；
If step 1.3, power factor (PF)It is greater than the set value and phase difference ω t+ Φ is greater than 0, then current system compensation is more than to be
Capacitive is presented in the load of system, needs to cut off capacitor；
If step 1.4, power factor (PF)It is greater than the set value and phase difference ω t+ Φ is less than 0, then current system compensation is more than to be
Perception is presented in the load of system, needs to carry out pre-cut, i.e. cut-out capacitor to capacitor；
If step 1.5, phase difference ω t+ Φ are equal to 0 and power factor (PF)More than or less than setting value, then current system compensates
It not up to or is more than offset, the load presentation of system is resistive, needs to carry out part excision or investment to capacitor, makes system
Power factor (PF) is maintained in the power factor (PF) value of setting.
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| CN107800141A (en) * | 2016-08-31 | 2018-03-13 | 中国石油化工股份有限公司 | A kind of Reactive Compensation of Distribution Lines method and system |
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