CN104779617A - Frequency modulation participation method for electrolytic aluminum in electrolytic aluminum power supply system - Google Patents
Frequency modulation participation method for electrolytic aluminum in electrolytic aluminum power supply system Download PDFInfo
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- CN104779617A CN104779617A CN201510210989.3A CN201510210989A CN104779617A CN 104779617 A CN104779617 A CN 104779617A CN 201510210989 A CN201510210989 A CN 201510210989A CN 104779617 A CN104779617 A CN 104779617A
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- frequency
- electrolytic aluminium
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- electric power
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Power Engineering (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention relates to the technology of power grid frequency modulation, in particular to a frequency modulation participation method for electrolytic aluminum in an electrolytic aluminum power supply system. High voltage inlet wire PT three-phase synchronous frequency signals are collected and analyzed through a regulated current control system, and an electrolytic aluminum stabilized current system is controlled to carry out electrolytic aluminum load adjustment. According to the frequency modulation method, the frequency of the electrolytic aluminum power supply system can be effectively controlled from dropping continuously, the frequency can be rapidly recovered to 50+/-0.5 Hz, generator set primary frequency modulation operation is reduced, the generator set failure rate is lowered, and the stability of the electrolytic aluminum power supply system is effectively improved.
Description
Technical field
The present invention relates to a kind of power grid frequency modulation technology, be specifically related to electrolytic aluminium load in a kind of electrolytic aluminium electric power system and participate in the method for frequency modulation.
Background technology
Direct-furnish net be electrolytic aluminium when powering mains frequency unstable, usually because effect voltage causes frequency decrease, then by generating set primary frequency regulation, frequency is floated, be difficult to allow frequency stabilization at 50 ± 0.5Hz, and generating set primary frequency regulation action frequency is frequent, average action every day 4000 times, comparatively large to generating set harm, be unfavorable for the safe operation of direct-furnish net.
Direct-furnish net defect is as follows:
1, direct power supply system due to net capacity less, so the fluctuation of load just affects mains frequency instability very easily, because generation current unit frequency modulation low precision and governing speed are slow, so poor to the stablizing effect of frequency, simultaneity factor fluctuation is frequently difficult to return to 50 ± 0.5Hz;
2, because the load fluctuation of electrolysis direct-furnish net is frequent, cause generating set primary frequency regulation to act frequently, not only damage generating set adjuster, frequency is also difficult to stablize.
Summary of the invention
The object of the invention is to provide electrolytic aluminium load in a kind of electrolytic aluminium electric power system to participate in the method for frequency modulation for prior art Problems existing.
In a kind of electrolytic aluminium electric power system of the present invention, electrolytic aluminium load participates in the method for frequency modulation, frequency adjustment is realized by current stabilization control system, current stabilization control system is made up of PT signal isolated location, frequency A/D converting unit, signal gathering unit, CPU processing unit and the electrolytic aluminium steady flow system connected successively, specifically comprises the following steps:
1) collection of current stabilization control system frequency: PT signal isolated location and frequency A/D converting unit carry out isolation processing and signal conversion processes successively to high pressure inlet wire PT three-phase synchronous frequency signal, and the signal after conversion is by signal gathering unit Real-time Collection;
2) analysis of current stabilization control system frequency: the PT three-phase synchronous frequency signal collected is by between CPU processing unit determination frequency value location, in PT three-phase synchronous frequency signal, at least two-way frequency signal is positioned at same interval, then determine that electric power system frequency f is positioned at this interval;
3) adjustment of current stabilization control system frequency: CPU processing unit carries out electrolytic aluminium Load Regulation according to electric power system frequency f place range restraint electrolytic aluminium steady flow system;
It is interval that electric power system frequency f is positioned at 49.7 ~ 49.6Hz and 50.3 ~ 50.4Hz, and electrolytic aluminium load frequency modulation method is: electrolytic aluminium load when being positioned at 50 ± 0.5Hz for electrical system frequency f is fiducial value; 49.7Hz >=f >=49.6Hz, reduce by 2% to electrolytic aluminium load, electric power system frequency f is recovered and is stabilized in 50 ± 0.1Hz duration more than 30s, and electrolytic aluminium load divides and returns to former load value 3 times; 50.3Hz >=f >=50.4Hz, to electrolytic aluminium Load lifting 2%, electric power system frequency f is recovered and is stabilized in 50 ± 0.1Hz duration more than 30s, and electrolytic aluminium load divides and returns to former load value 3 times.
It is interval that electric power system frequency f is positioned at 49.3Hz ~ 49.0Hz, and electrolytic aluminium load frequency modulation method is: electrolytic aluminium load when being positioned at 49.7 ~ 49.6Hz for electrical system frequency f is fiducial value; 49.3Hz >=f>49.2Hz, reduces by 2% to electrolytic aluminium load; 49.2Hz >=f>49.1Hz, reduces by 3% to electrolytic aluminium load; 49.1Hz >=f>49.0Hz, reduces by 4% to electrolytic aluminium load;
Described frequency A/D converting unit is made up of three frequency transmitters;
Described signal gathering unit is PLC Analog input mModule.
The present invention has following beneficial effect:
The present invention is gathered by current stabilization control system high pressure inlet wire PT three-phase synchronous frequency signal and analyzes, control electrolytic aluminium steady flow system and carry out electrolytic aluminium Load Regulation, frequency modulation method of the present invention can effectively suppress the frequency keeps of electrolytic aluminium electric power system to glide, and frequency can be made to return to 50 ± 0.5Hz fast, reduce generating set primary frequency regulation operation, reduce generating set failure rate, effectively improve the stability of electrolytic aluminium electric power system.
Accompanying drawing explanation
Fig. 1 is the structural representation of current stabilization control system of the present invention.
Embodiment
The PT three-phase synchronous frequency signal of electrolytic aluminium electric power system carries out isolated buck process by PT signal isolated location as shown in Figure 1, guarantee the synchronism of PT three-phase synchronous frequency signal phase sequence and frequency simultaneously, PT three-phase synchronous frequency signal after isolation is by frequency A/D converting unit, convert detection AC signal frequency to DC analogue quantity signal and input to signal gathering unit collection again, the signal collected inputs to the analysis contrast that CPU processing unit carries out frequency, between determination frequency value location, in PT three-phase synchronous frequency signal, at least two-way frequency signal is positioned at same interval, then determine that electric power system frequency f is positioned at this interval, CPU processing unit carries out electrolytic aluminium Load Regulation according to electric power system frequency place range restraint electrolytic aluminium steady flow system again.
Electric power system frequency f normal working frequency is 50 ± 0.5Hz, with the electrolytic aluminium load under this frequency for fiducial value, when frequency drops to 49.7Hz >=f >=49.6Hz, 2% is reduced to electrolytic aluminium load, electric power system frequency f is recovered and is stabilized in 50 ± 0.1Hz duration more than 30s, and electrolytic aluminium load divides and returns to former load value 3 times; If frequency still continues to fall, when dropping to 49.3Hz >=f>49.2Hz, with electrolytic aluminium load during 49.7Hz >=f >=49.6Hz for fiducial value, reduce by 2% to electrolytic aluminium load, if frequency recovers normal value, electrolytic aluminium load restoration is to former load value; Drop to 49.2Hz >=f>49.1Hz if continue, with electrolytic aluminium load during 49.7Hz >=f >=49.6Hz for fiducial value, reduce by 3% to electrolytic aluminium load, if frequency recovers normal value, electrolytic aluminium load restoration is to former load value; Drop to 49.1Hz >=f>49.0Hz if continue, with electrolytic aluminium load during 49.7Hz >=f >=49.6Hz for fiducial value, reduce by 4% to electrolytic aluminium load, if frequency recovers normal value, electrolytic aluminium load restoration is to former load value; If electric power system frequency f continues to drop to below 49.0Hz, by generating set frequency modulation.
If electric power system frequency f rises to 50.3Hz >=f >=50.4Hz, electrolytic aluminium load when being positioned at 50 ± 0.5Hz for electrical system frequency f is fiducial value, to electrolytic aluminium Load lifting 2%, recover when electric power system frequency f and be stabilized in 50 ± 0.1Hz duration more than 30s, electrolytic aluminium load divides and returns to former load value 3 times; If electric power system frequency f continues to rise to 50.4Hz, by generating set frequency modulation.
Claims (3)
1. in electrolytic aluminium electric power system, electrolytic aluminium load participates in the method for frequency modulation, it is characterized in that: realize frequency adjustment by current stabilization control system, current stabilization control system is made up of PT signal isolated location, frequency A/D converting unit, signal gathering unit, CPU processing unit and the electrolytic aluminium steady flow system connected successively, specifically comprises the following steps:
The collection of current stabilization control system frequency: PT signal isolated location and frequency A/D converting unit carry out isolation processing and signal conversion processes successively to high pressure inlet wire PT three-phase synchronous frequency signal, and the signal after conversion is by signal gathering unit Real-time Collection;
The analysis of current stabilization control system frequency: the PT three-phase synchronous frequency signal collected is by between CPU processing unit determination frequency value location, in PT three-phase synchronous frequency signal, at least two-way frequency signal is positioned at same interval, then determine that electric power system frequency f is positioned at this interval;
The adjustment of current stabilization control system frequency: CPU processing unit carries out electrolytic aluminium Load Regulation according to electric power system frequency f place range restraint electrolytic aluminium steady flow system;
It is interval that electric power system frequency f is positioned at 49.7 ~ 49.6Hz and 50.3 ~ 50.4Hz, and electrolytic aluminium load frequency modulation method is: electrolytic aluminium load when being positioned at 50 ± 0.5Hz for electrical system frequency f is fiducial value; 49.7Hz >=f >=49.6Hz, reduce by 2% to electrolytic aluminium load, electric power system frequency f is recovered and is stabilized in 50 ± 0.1Hz duration more than 30s, and electrolytic aluminium load divides and returns to former load value 3 times; 50.3Hz >=f >=50.4Hz, to electrolytic aluminium Load lifting 2%, electric power system frequency f is recovered and is stabilized in 50 ± 0.1Hz duration more than 30s, and electrolytic aluminium load divides and returns to former load value 3 times;
It is interval that electric power system frequency f is positioned at 49.3Hz ~ 49.0Hz, and electrolytic aluminium load frequency modulation method is: electrolytic aluminium load when being positioned at 49.7 ~ 49.6Hz for electrical system frequency f is fiducial value; 49.3Hz >=f>49.2Hz, reduces by 2% to electrolytic aluminium load; 49.2Hz >=f>49.1Hz, reduces by 3% to electrolytic aluminium load; 49.1Hz >=f>49.0Hz, reduces by 4% to electrolytic aluminium load.
2. electrolytic aluminium load participates in the method for frequency modulation in electrolytic aluminium electric power system as claimed in claim 1, it is characterized in that: described frequency A/D converting unit is made up of three frequency transmitters.
3. electrolytic aluminium load participates in the method for frequency modulation in electrolytic aluminium electric power system as claimed in claim 1, it is characterized in that: described signal gathering unit is PLC Analog input mModule.
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| CN201510210989.3A CN104779617B (en) | 2015-04-29 | 2015-04-29 | Frequency modulation participation method for electrolytic aluminum in electrolytic aluminum power supply system |
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| CN201510210989.3A CN104779617B (en) | 2015-04-29 | 2015-04-29 | Frequency modulation participation method for electrolytic aluminum in electrolytic aluminum power supply system |
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| CN104779617B CN104779617B (en) | 2017-05-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864768A (en) * | 2020-07-22 | 2020-10-30 | 山东大学 | Control method and system for participation of electrolytic aluminum load in primary frequency modulation |
| CN113141015A (en) * | 2021-03-18 | 2021-07-20 | 云南电网有限责任公司 | Control method for electrolytic aluminum load participating in frequency modulation of transmission-end power grid |
| CN114243731A (en) * | 2022-02-23 | 2022-03-25 | 武汉大学 | Controlled load damping factor controller and frequency modulation method adopting controller |
| CN116706943A (en) * | 2023-08-07 | 2023-09-05 | 武汉大学 | Multi-electrolytic aluminum load coordination control method based on segmented difference adjustment coefficient |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013162563A (en) * | 2012-02-02 | 2013-08-19 | Mitsubishi Electric Corp | Power demand/supply control device and power demand/supply control method |
| CN104052071A (en) * | 2014-04-18 | 2014-09-17 | 上海明华电力技术工程有限公司 | Intelligent primary frequency modulation method for generator set |
-
2015
- 2015-04-29 CN CN201510210989.3A patent/CN104779617B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013162563A (en) * | 2012-02-02 | 2013-08-19 | Mitsubishi Electric Corp | Power demand/supply control device and power demand/supply control method |
| CN104052071A (en) * | 2014-04-18 | 2014-09-17 | 上海明华电力技术工程有限公司 | Intelligent primary frequency modulation method for generator set |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864768A (en) * | 2020-07-22 | 2020-10-30 | 山东大学 | Control method and system for participation of electrolytic aluminum load in primary frequency modulation |
| CN113141015A (en) * | 2021-03-18 | 2021-07-20 | 云南电网有限责任公司 | Control method for electrolytic aluminum load participating in frequency modulation of transmission-end power grid |
| CN114243731A (en) * | 2022-02-23 | 2022-03-25 | 武汉大学 | Controlled load damping factor controller and frequency modulation method adopting controller |
| CN116706943A (en) * | 2023-08-07 | 2023-09-05 | 武汉大学 | Multi-electrolytic aluminum load coordination control method based on segmented difference adjustment coefficient |
| CN116706943B (en) * | 2023-08-07 | 2023-10-24 | 武汉大学 | Multi-electrolytic aluminum load coordination control method based on segmented difference adjustment coefficient |
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| CN104779617B (en) | 2017-05-03 |
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