CN116316620A - Intelligent ordering algorithm for avoiding resonance in electric power hybrid compensation system - Google Patents
Intelligent ordering algorithm for avoiding resonance in electric power hybrid compensation system Download PDFInfo
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- CN116316620A CN116316620A CN202310259551.9A CN202310259551A CN116316620A CN 116316620 A CN116316620 A CN 116316620A CN 202310259551 A CN202310259551 A CN 202310259551A CN 116316620 A CN116316620 A CN 116316620A
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- 239000003990 capacitor Substances 0.000 claims abstract description 80
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000012163 sequencing technique Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 16
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear 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
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- Y02E40/40—Arrangements for reducing harmonics
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses an intelligent ordering algorithm for avoiding resonance in an electric power hybrid compensation system, which comprises the following steps: detecting harmonic current, calculating a system current component by using a DTF algorithm through waveform sampling of the system current, then calculating a system load current component through load current sampling, and judging that the harmonic current has an amplifying trend when one or more harmonic components in the system current component are different from one or more harmonic components on the load side; and secondly, preventing current resonance, and when harmonic current has an amplifying trend, controlling switching of the capacitor with the smallest capacity and changing the switching sequence of the switched capacitor according to an intelligent sequencing algorithm by a control unit, wherein the switching quantity and the switching interval timely generate conditions for damaging resonance. The invention has the beneficial effects of effectively avoiding the occurrence of resonance problem and prolonging the service life of the APF.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system.
Background
In actual power grid operation, harmonic waves and reactive power are inevitably generated due to nonlinear load, an intelligent capacitor is commonly used at present when the reactive power is treated, and when the capacitor is used, the capacitor has certain reactance in the existing ubiquitous capacitance compensation, namely has certain reactance rate, when the harmonic waves exist, the resonance phenomenon is extremely easy to generate under the harmonic wave environment by the reactance of the capacitor, and the amplification or oscillation of compensation current generates impact on the power grid, so that serious influence is caused. Therefore, effectively avoiding resonance problems is an important influencing factor for good operation of the grid.
Disclosure of Invention
The invention aims to solve the problems, and designs an intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system.
An intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system, the method comprising the steps of:
detecting harmonic current, calculating a system current component by using a DTF algorithm, wherein the system current component comprises reactive components and harmonic components, and then calculating a system load current component, namely reactive components and harmonic components, by using load current sampling, and judging that the harmonic current has an amplifying trend when one or more harmonic components in the system current component are different from one or more harmonic components on the load side;
and secondly, preventing current resonance, when harmonic current has an amplifying trend, controlling switching of the capacitor with the smallest capacity and changing the switching sequence of the switched capacitor according to an intelligent sequencing algorithm by the control unit, wherein the switching quantity and the switching interval timely generate conditions for damaging resonance, and effectively preventing resonance.
The intelligent sequencing algorithm is to record reactive components of the system current detected by the CT at the system side as
The compensation capacity required by ASVG is noted +.>
The compensation capacity of the single capacitor is recorded as +.>
The number of capacitors is->
(n is a positive integer), CT system sampling detects reactive component +.>
When the capacitor is in the closed state, the capacity of the capacitor is compared; when->
When the required compensation dead load is smaller than the minimum compensation capacity of a single capacitor, the capacitor is not required to be switched, and the compensation is to compensate all the capacitive reactive power by ASVG
The method comprises the steps of carrying out a first treatment on the surface of the When->
When the required compensation dead quantity is larger than the minimum compensation capacity of a single capacitor, the SVG calculates the number of capacitors required to be input, namely +.>
(n is a positive integer); when->
The reactive component reaches the threshold value of 1 or more of the capacitive inputs, the input is->
Bench, n is an integer fraction, ASVG compensation capacity is +.>
。
When (when)
When the required compensation dead quantity is larger than the compensation maximum capacity of a single capacitor, ASVG firstly controls the +.>
And the capacitor input with less switching times; if at this time->
The required compensation non-work amount is larger than the compensation maximum capacity of a single capacitor of the residual intelligent capacitors, and ASVG controls the co-compensation capacitor with the maximum current compensation capacitance and the minimum switching times; when the switching of the co-compensation capacitor is finished and reactive compensation is still unsatisfied, switching the co-compensation capacitor: ASVG first controls the division compensation capacitor +.>
And the capacitor input with less switching times is added, if at this time +.>
The required compensation non-work amount is larger than the compensation maximum capacity of a single capacitor of the residual intelligent capacitors, and ASVG controls the sub-compensation capacitor with the maximum current compensation capacitance and the minimum switching times; repeating the judging steps until the intelligent capacitor does not meet the switching condition, and if yes>
Then ASVG is put into fine compensation to make +.>
。
Advantageous effects
The intelligent ordering algorithm for avoiding resonance in the electric power hybrid compensation system, which is manufactured by utilizing the technical scheme of the invention, has the following advantages:
1. the method can find out the resonance frequency when resonance occurs and the trend of harmonic current amplification when resonance occurs in time, so as to actively intervene, avoid the continuous amplification of harmonic current, prevent the continuous occurrence of resonance phenomenon, and be beneficial to avoiding resonance;
2. the method can utilize the capacitor to the maximum extent, greatly improves the switching efficiency of the original intelligent capacitor, ensures better coordination of the compensation work of the capacitor and the APF, achieves fine reactive compensation, reduces the switching times of the capacitor, can accurately carry out the investment or the cutting of the effective capacitance capacity, effectively avoids the resonance problem, greatly improves the utilization rate and the use safety of the capacitor, reduces the condition of full-load operation of the APF, and prolongs the service life of the APF.
Drawings
FIG. 1 is a flow chart of an intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system according to the present invention;
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, as shown in fig. 1;
in the implementation process of the technical scheme, a control system samples by CT, collects current and carries out analysis and calculation of current components, the waveform of system voltage and current is sampled by a calculation unit, and the calculation is carried out by using a DFT algorithm: fundamental current
3 rd harmonic current->
5 th harmonic current->
7 th harmonic current->
11 th harmonic current->
13 th harmonic current->
15 th harmonic current->
The method comprises the steps of carrying out a first treatment on the surface of the The reactive component of the system current detected by the system-side CT is recorded as +.>
The compensation capacity required by APF is noted +.>
The compensation capacity of the single capacitor is recorded as +.>
The number of capacitors is->
(n is a positive integer), CT system sampling detects reactive component +.>
The capacitor capacity will be compared when +.>
When the required compensation dead quantity is smaller than the minimum compensation capacity of a single capacitor, the capacitor is not required to be switched, and the APF compensates all the capacitive reactive power, namely +.>
The method comprises the steps of carrying out a first treatment on the surface of the When->
When the required compensation dead quantity is larger than the minimum compensation capacity of a single capacitor, the SVG calculates the number of capacitors required to be input, namely +.>
(n is a positive integer); when->
The reactive component reaches the threshold value of 1 or more of the capacitive inputs, the input is->
Station, n integer parts, APF compensation capacity is +.>
. The intelligent capacitor input adopts the principle of 'common compensation firstly, sub-compensation and then high-capacity firstly, low-capacity and then low-switching times firstly'; when->
When the required compensation dead quantity is larger than the compensation maximum capacity of a single capacitor, the APF firstly controls the +.>
And the capacitor input with less switching times; if at this time->
The required compensation non-work amount is larger than the compensation maximum capacity of a single capacitor of the residual intelligent capacitor, and the APF controls the co-compensation capacitor with the maximum current compensation capacitance and the minimum switching times; when the switching of the co-compensation capacitor is finished and reactive compensation is still unsatisfied, switching the co-compensation capacitor: APF first controls the division compensation capacitor +.>
And the capacitor input with less switching times is added, if at this time +.>
The required compensation non-work amount is larger than the compensation maximum capacity of a single capacitor of the residual intelligent capacitor, and the APF controls the sub-compensation capacitor with the maximum current compensation capacitance and the minimum switching times; repeating the judging steps until the intelligent capacitor does not meet the switching condition, and if yes>
The APF is put into fine compensation to make
。
When the CT sampling system current is analyzed and compared to judge that harmonic current amplification trend exists and resonance problem occurs, the control strategy of the hybrid compensation system controls the switching of the minimum capacity of the capacitor and changes the switching sequence, the switching quantity and the switching interval of the switched capacitor on the basis of the sequencing algorithm, so that the condition of resonance occurrence is destroyed, the harmonic current is prevented from being amplified continuously, and resonance is prevented from occurring continuously.
The electronic devices adopted by the technical scheme are all existing products, the technical scheme of the application has no special requirements and changes on the structure of the electronic devices, and the electronic devices belong to conventional electronic equipment;
in the implementation process of the technical scheme, the person skilled in the art needs to connect all the electric components in the scheme with the adaptive power supply thereof through wires, and should select an appropriate controller according to actual conditions so as to meet control requirements, specific connection and control sequence, and the electric connection is completed by referring to the following working principles in the working sequence among the electric components, and the detailed connection means are known in the art, and mainly introduce the working principles and the process as follows, and do not describe the electric control.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The term "comprising" an element defined by the term "comprising" does not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
The above technical solution only represents the preferred technical solution of the present invention, and some changes that may be made by those skilled in the art to some parts of the technical solution represent the principles of the present invention, and the technical solution falls within the scope of the present invention.
Claims (3)
1. An intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system, which is characterized by comprising the following steps:
detecting harmonic current, calculating a system current component by using a DTF algorithm, wherein the system current component comprises reactive components and harmonic components, and then calculating a system load current component, namely reactive components and harmonic components, by using load current sampling, and judging that the harmonic current has an amplifying trend when one or more harmonic components in the system current component are different from one or more harmonic components on the load side;
and secondly, preventing current resonance, when harmonic current has an amplifying trend, controlling switching of the capacitor with the smallest capacity and changing the switching sequence of the switched capacitor according to an intelligent sequencing algorithm by the control unit, wherein the switching quantity and the switching interval timely generate conditions for damaging resonance, and effectively preventing resonance.
2. An intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system according to claim 1, characterized in that the intelligent ordering algorithm marks the reactive component of the system current detected by the system side CT as
The compensation capacity required by ASVG is noted +.>
The compensation capacity of the single capacitor is recorded as +.>
The number of capacitors is->
(n is a positive integer), CT system sampling detects reactive component +.>
When the capacitor is in the closed state, the capacity of the capacitor is compared; when->
When the required compensation dead load is smaller than the minimum compensation capacity of a single capacitor, the capacitor is not required to be switched, and the compensation is to compensate all the capacitive reactive power by ASVG
The method comprises the steps of carrying out a first treatment on the surface of the When->
When the required compensation dead quantity is larger than the minimum compensation capacity of a single capacitor, the SVG calculates the number of capacitors required to be input, namely +.>
(n is a positive integer); when->
The reactive component reaches the threshold value of 1 or more of the capacitive inputs, the input is->
Bench, n is an integer fraction, ASVG compensation capacity is +.>
。
3. An intelligent ordering algorithm for avoiding resonance in a power hybrid compensation system according to claim 1, wherein when
When the required compensation dead quantity is larger than the compensation maximum capacity of a single capacitor, ASVG firstly controls the +.>
And the capacitor input with less switching times; if at this time->
The required compensation non-work amount is larger than the compensation maximum capacity of a single capacitor of the residual intelligent capacitors, and ASVG controls the co-compensation capacitor with the maximum current compensation capacitance and the minimum switching times; when the switching of the co-compensation capacitor is finished and reactive compensation is still unsatisfied, switching the co-compensation capacitor: ASVG first controls the division compensation capacitor +.>
And the capacitor input with less switching times is added, if at this time +.>
The required compensation non-work amount is larger than the compensation maximum capacity of a single capacitor of the residual intelligent capacitors, and ASVG controls the sub-compensation capacitor with the maximum current compensation capacitance and the minimum switching times; repeating the judging steps until the intelligent capacitor does not meet the switching condition, and if yes>
Then ASVG is put into fine compensation to make +.>
。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117039956A (en) * | 2023-08-10 | 2023-11-10 | 福建雄风电气有限公司 | Electric energy quality comprehensive treatment system based on novel photovoltaic energy storage technology |
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| CN110137966A (en) * | 2019-04-17 | 2019-08-16 | 浙江晟泰电气有限公司 | A kind of electric current intervenes algorithm, resonance administering method and system in advance |
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| CN114825366A (en) * | 2022-05-12 | 2022-07-29 | 浙江晟泰电气有限公司 | Method for intelligent compensation by using capacitor in power grid hybrid compensation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117039956A (en) * | 2023-08-10 | 2023-11-10 | 福建雄风电气有限公司 | Electric energy quality comprehensive treatment system based on novel photovoltaic energy storage technology |
| CN117039956B (en) * | 2023-08-10 | 2024-04-02 | 福建雄风电气有限公司 | Electric energy quality comprehensive treatment system based on novel photovoltaic energy storage technology |
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