CN111478320A - Comprehensive load model suitable for load of variable-frequency air conditioner with high proportion - Google Patents
Comprehensive load model suitable for load of variable-frequency air conditioner with high proportion Download PDFInfo
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- CN111478320A CN111478320A CN202010315894.9A CN202010315894A CN111478320A CN 111478320 A CN111478320 A CN 111478320A CN 202010315894 A CN202010315894 A CN 202010315894A CN 111478320 A CN111478320 A CN 111478320A
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- 230000006698 induction Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 description 10
- 230000001052 transient effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005206 flow analysis Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 238000005057 refrigeration Methods 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
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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
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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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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a comprehensive load model suitable for a load containing a high-proportion variable frequency air conditioner. According to the method, the working mechanism of the variable frequency air conditioner is analyzed, a detailed load model of the variable frequency air conditioner is established, the active and reactive characteristics of the variable frequency air conditioner are researched, the reactive power part of an induction motor of a classical comprehensive load model is adjusted through the analysis of the active and reactive characteristics of the variable frequency air conditioner load, and an improved comprehensive load model is established. Compared with a classical comprehensive load model, the model has higher precision for the pure variable frequency air conditioner load cluster and the comprehensive equivalent containing high-proportion variable frequency air conditioner loads.
Description
Technical Field
The invention belongs to the field of load modeling, and particularly relates to detailed modeling of variable frequency air conditioner loads and comprehensive equivalent modeling containing high-proportion variable frequency air conditioner loads.
Background
Load modeling technology is a key and difficult point of power system research, and for digital simulation of a power system, the precision of a load model has a very important influence on the load model.
With the continuous development of power electronic technology, the application of power electronic equipment in a power system is more and more, frequency converters, frequency conversion refrigerators and the like are widely applied, and the occupation ratio of frequency conversion air conditioners in power loads is not a little great as the essential equipment in places such as residential buildings, markets, companies and the like. The air conditioners have the characteristics of large quantity, large capacity and centralized starting under the influence of weather, and the load proportion of the air conditioners exceeds 30% in summer power peak period in east China at present; in the economically developed cities such as the northern Shanghai, the load ratio of the air-conditioning equipment in the summer peak electricity utilization period is nearly 50%. The percentage of the frequency conversion air conditioners in the total air conditioning equipment reaches 58%, the development of the white paper of the Chinese refrigeration air conditioner industry in 2017 shows that the sales volume of the Chinese room air conditioners exceeds 1.4 hundred million, the percentage increases by 31%, and most of the newly sold air conditioners are frequency conversion air conditioners.
from ' power grid technology ' at volume 31 of 2007, a thesis of the scholars ' book ' at volume 31 of 2011, a thesis of the scholars ' book ' at volume 08 of 2011, a thesis of the scholars ' book ' with ideal load model ', the problem that the low-voltage bus voltage is too low under partial conditions is considered, a comprehensive load model with an ideal transformer is provided, a comprehensive load model with an ideal transformer is considered, a comprehensive load model with a power distribution network collection equivalent and a total measurement identification model thereof, the problem that the low-voltage bus voltage is too low under partial conditions of the power distribution network is considered, a comprehensive load model with an ideal transformer is provided, a probability that the transformer runs at different taps, a comprehensive load model with a power distribution network collection equivalent and a total measurement identification model thereof are obviously considered, asynchronous motor and distribution network parameters are different reference values, and the probability that the transformer runs at different taps is introduced, a comprehensive load model with a comprehensive impedance conversion, and numerous achievements are obtained, and the power distribution network impedance compensation is only for the innovation of an electric power distribution system.
Aiming at the problem of electronization of load power of a power system, the invention establishes a detailed load model of the variable frequency air conditioner by taking the variable frequency air conditioner which is possibly used by every family as an example, improves a classical comprehensive load model by analyzing the special active and reactive characteristics of the variable frequency air conditioner, and provides a research direction for comprehensive equivalence containing high-proportion variable frequency air conditioner load.
Disclosure of Invention
The technical problems solved by the invention are as follows: aiming at the trend of the electronization of the power at the load side of the current power system, the power characteristics of the variable frequency air conditioner with the widest application are analyzed by taking the variable frequency air conditioner as an example, an improvement method for a classical comprehensive load model is provided, and the comprehensive equivalence of the variable frequency air conditioner with high proportion of load can be realized.
The technical scheme of the invention is as follows: firstly, a detailed load model of the inverter air conditioner shown in fig. 1 is established, and the model mainly comprises a power factor compensation capacitor, an inverter, a motor, a compressor, an indoor heat exchange equivalent module and an inverter controller. Under the same transient condition of the duration time of 0.25s and the voltage sag of 0.7p.u., the power changes of the inverter air conditioner in the real experiment and the model simulation are almost the same, and the power characteristics of the inverter air conditioner in the power pair such as shown in fig. 2 and 3 are theoretically analyzed as follows:
(1) When voltage sag occurs on the alternating current side, after diode rectification and full-control inversion, voltage sag with a small depth can also be generated on the voltage output by the frequency converter, the induction motor enters a transient process, and the active power consumed by the induction motor is the active power consumed by the diode rectification side.
(2) The phase difference between the AC side fundamental wave voltage and the fundamental wave current of the diode rectifier is zero, so that the reactive power of the variable frequency air conditioner can be approximately considered to be generated by the power factor compensation capacitor and has no relation with the transient reactive characteristic of the induction motor.
Due to the existence of the frequency converter, a classical comprehensive load model of the static ZIP load parallel induction motor cannot be accurately equivalent to a variable frequency air conditioner, so an improved comprehensive load model is provided on the basis, as shown in FIG. 4, and the improvement principle is as follows:
(1) Considering the characteristics of 'active and reactive power isolation' of the frequency converter, the reactive power characteristic of the induction motor with the frequency converter cannot be reflected in a power grid, and the active characteristic has no influence.
(2) The induction motor of the classic comprehensive load model is divided into two parts, wherein one part is a common induction motor, the other part is an induction motor with a frequency converter, and the ratio is k.
(3) Due to the characteristics of the frequency converter, the induction motor with the frequency converter does not consume reactive power, so that the reactive power with the proportion of k is subtracted from the total reactive power of the induction motor of the classical comprehensive load model. The mathematical expression for improving the power of the comprehensive load model is as follows:
In the formula, P and Q are total active power and reactive power respectively; subscript m and ZIP represent the inductor power and the ZIP static load power, respectively; k is the proportion of removing the reactive power of the induction motor.
The invention has the beneficial effects that: the method is more accurate than a classical comprehensive load model in the equivalence of pure variable frequency air conditioner load and variable frequency air conditioner load with high proportion. Therefore, the comprehensive equivalence, the power flow analysis and the transient simulation of the power distribution network mainly based on the residential users are more accurate. The concrete expression is as follows:
(1) Pure variable frequency air conditioner load cluster equivalence
A simulation model of 50 variable frequency air conditioner load clusters is established, voltage sag with the duration of 0.1 second is generated when 0.5 second exists, the sag depth is 0.7p.u, the simulation time is 1 second, and the simulation step length is 0.001 second. The equivalent accuracy error formula is as follows:
J＝∑((P-P′)2+(Q-Q′)2)
In the formula, P and Q are the active and reactive power of the original data, and P 'and Q' are the active and reactive power equivalent to the comprehensive model.
The equivalent error of the improved comprehensive load equivalent model to the pure power electronic load is 0.0363, the equivalent error of the classical comprehensive load model is 0.5512, and equivalent comparison graphs are shown in fig. 6 and 7.
(2) Comprehensive equivalent load of high-proportion variable frequency air conditioner
A simulation model containing a high-proportion power electronic load is established, the proportion of the power electronic load is calculated according to the active power of the power electronic load, a voltage sag with the duration of 0.1 second is generated in 1 second, the sag depth is 0.7p.u, the simulation time is 3 seconds, and the simulation step length is 0.001 second. The equivalent deviation is shown in the following table for different ratios, where the power ratio of 40% of the air conditioner ratio is selected as shown in fig. 8 and 9.
The equivalent of the improved comprehensive load model to the pure electric and electronic load and the load containing high-proportion electric and electronic load is more accurate than that of the classical comprehensive load model.
Drawings
The invention will be described with reference to the accompanying drawings, in which:
FIG. 1 is a detailed model structure of the inverter air conditioner load established by the present invention.
Fig. 2 shows the active characteristics of the inverter air conditioner during voltage sag.
Fig. 3 shows the reactive characteristic of the inverter air conditioner during voltage sag.
FIG. 4 is a modified integrated load model structure of the present invention.
FIG. 5 is a flow chart of a parameter identification portion of the present invention.
Fig. 6 is a comparison of the active power equivalent results for a pure variable frequency air conditioner load cluster.
Fig. 7 is a comparison of the reactive power equivalent results of the pure variable frequency air conditioner load cluster.
Fig. 8 is a comparison of the equivalent results of the active power of the power distribution network with the load ratio of the variable frequency air conditioner being 40%.
Fig. 9 is a comparison of the reactive power equivalent results of the distribution network with the load ratio of the variable frequency air conditioner being 40%.
Detailed Description
As shown in fig. 4, the invention provides an improved comprehensive load model suitable for a load of a variable frequency air conditioner with a high proportion, and the specific use method is as follows:
(1) And for the load of the power distribution network needing to be integrated and equivalent, acquiring historical transient power data of a 110kV or 220kV bus of a 220kV transformer substation of the power distribution network or acquiring the transient power data through a disturbance test.
(2) The obtained transient power data is used as input, the improved comprehensive load model of the invention is used as a mathematical model, a particle swarm algorithm or other intelligent algorithms are used as a parameter identification method, and the parameters to be identified in the improved comprehensive load model are identified, and the specific flow is shown in fig. 5.
(3) And the model can replace a power distribution network to be equivalent so as to carry out power flow analysis or transient simulation on the whole system comprising the power distribution network.
Claims (3)
1. The utility model provides a frequency conversion air conditioner load detail model based on theory of operation which characterized in that: the indoor heat exchange system comprises a frequency converter, a power factor compensation capacitor, a compressor driving motor, a compressor, an indoor heat exchange equivalent module and a frequency conversion controller.
2. The inverter air conditioner load detail model according to claim 1, characterized in that: the variable frequency controller takes the temperature difference between the set temperature of the air conditioner and the indoor temperature as the input quantity of the controller, takes PI control as a control method, and adjusts the amplitude and the frequency of the voltage output by the frequency converter.
3. A comprehensive load model suitable for containing high-proportion variable frequency air conditioner load is characterized in that: the system comprises a static load, an induction motor load and a reactive power adjusting part of the induction motor load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010315894.9A CN111478320A (en) | 2020-04-21 | 2020-04-21 | Comprehensive load model suitable for load of variable-frequency air conditioner with high proportion |
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| CN202010315894.9A CN111478320A (en) | 2020-04-21 | 2020-04-21 | Comprehensive load model suitable for load of variable-frequency air conditioner with high proportion |
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| CN111478320A true CN111478320A (en) | 2020-07-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994031A (en) * | 2021-03-19 | 2021-06-18 | 国网安徽省电力有限公司电力科学研究院 | SVM static reactive load modeling method based on air conditioner load proportion |
-
2020
- 2020-04-21 CN CN202010315894.9A patent/CN111478320A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994031A (en) * | 2021-03-19 | 2021-06-18 | 国网安徽省电力有限公司电力科学研究院 | SVM static reactive load modeling method based on air conditioner load proportion |
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