CN104779619A - Power grid low-frequency control method for direct power supply system from large power source to heave load - Google Patents
Power grid low-frequency control method for direct power supply system from large power source to heave load Download PDFInfo
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- CN104779619A CN104779619A CN201510211008.7A CN201510211008A CN104779619A CN 104779619 A CN104779619 A CN 104779619A CN 201510211008 A CN201510211008 A CN 201510211008A CN 104779619 A CN104779619 A CN 104779619A
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Abstract
The invention discloses a power-grid low-frequency control method for a direct power supply system from large power source to a heave load. According to inner grid load characteristics, a unit primary frequency modulation dead zone lower limit parameter and an electrolytic aluminum frequency modulation parameter are formulated, a safe and stable control system is optimized, and a low-frequency cutting control parameter is set. By optimizing the cooperative relationship of the three sides, namely the inner grid primary frequency modulation dead zone lower limit parameter arrangement, the frequency modulation capacity and the low-frequency control function of the safe and stable control system, the safe and stable running of a power grid is guaranteed in the normal condition, reliable acting of the low-frequency function of the safe and stable control system under the accident condition is guaranteed, and the safety of the device and people is guaranteed. The problem of the system low-frequency, caused by the electrolytic aluminum anode effect and electrode changing, of the direct power supply system is solved, the safe and stable running of the direct power supply system is achieved, and the economic benefit of electrolytic aluminum producing is improved.
Description
Technical field
The invention belongs to power system operation and control technology field, relate to large power supply to net frequency modulation adjusting method in large load direct power supply system, particularly a kind of large power supply is to electrical network low frequency control method in large load direct power supply system.
Background technology
Large power supply to the large load direct power supply system operation of power networks initial stage due to the increase of other loads in electrolytic aluminium anode effect and net, continue in net to occur low frequency, and the conveniently electrical network setting of the chirp parameter of unit, finally because unit fm capacity is limited, cause the safety stabilization control system low frequency controlling functions action of netting interior configuration.Specific as follows: 1, net internal loading increase situation is: first in net, other loads increase 6MW load, and after 280 milliseconds, frequency drops to 49.994Hz; After 1.512 seconds there is anode effect in First Series electrolytic aluminium, and inverter side direct voltage rises to 693V by 675V, and direct current rises to 501.9kA by 499.6kA, and load growth rate is about 3.14%, about 11.30MW; After 9.152 seconds there is anode effect in second series electrolytic aluminium, and inverter side direct voltage rises to 706V by 697V, and direct current rises to 502.1kA by 496.1kA, and load increases by 2.52%, about 9.12MW within the nearly 1s time.Comprehensive above-mentioned load acting in conjunction, is not considering to net interior primary frequency modulation operative condition lower frequency glide as shown in Figure 1 by simulation analysis software emulation; 2, consider that (unit primary frequency modulation parameter conveniently electrical network is arranged unit Primary frequency control ability in net, and unit reserve capacity is according to the percentage settings of current loads) after again by simulation analysis software simulation frequency change curve as shown in Figure 2: there is following problem according to above-mentioned situation analysis large power supply to large load direct power supply system: 1. unit primary frequency modulation deadband lower limit value arranges less than normal, fail to avoid normal electrolytic aluminium anode effect, unit primary frequency modulation acts frequently.2. only have the primary frequency modulation of unit in net, there is no other mode of frequency regulations.3. in net, unit primary frequency modulation clipping parameter arranges less than normal, does not discharge the due fm capacity of unit.
Summary of the invention
In order to solve the aforementioned problems in the prior, the invention provides a kind of large power supply to electrical network low frequency control method in large load direct power supply system.
For achieving the above object, the present invention takes following technical scheme:
A kind of large power supply, to electrical network low frequency control method in large load direct power supply system, is formulated unit primary frequency modulation deadband lower limit parameter, electrolytic aluminium chirp parameter according to electrolytic aluminium part throttle characteristics, is optimized safety stabilization control system, arranges low cut controling parameters.Specifically comprise the following steps,
A, according to electrolytic aluminium part throttle characteristics actual in direct power supply system, find system frequency fluctuation range in net, progressively adjust unit primary frequency modulation deadzone parameter setting value, unit primary frequency modulation deadband lower limit parameter-24rpm is set according to frequency suspension value 49.6Hz; And suitably amplifying the primary frequency modulation deadzone parameter of unit in net, the first frequency modulation unit is less than the second frequency modulation unit, and the second frequency modulation unit is less than the 3rd frequency modulation unit;
B, in net, under equal load disturbance, under CCS, power control, valve control difference control model, select the control model of unit Primary frequency control ability the best;
C, determine that unit frequency modulation amplitude is arranged according to 10% of unit rated load, guarantee that the standby capacity that always revolves that can recall in electrical network meets service requirement;
D., when direct power supply electrical network occurs still can not maintaining mains frequency after unit Primary frequency control ability discharges completely, frequency modulation function is increased in load side.When electrolytic aluminium control system monitoring system frequency reaches 49.3 ~ 49.0Hz, electrolytic aluminium control system frequency modulation control logic starts immediately, adjustment current stabilization control objectives value, points of 3 grades adjustment 2%, 1%, 1% unidirectional load shedding modes that are respectively adjust that electrolytic aluminium load is electrolytic aluminium total load 4%.
Further, after above-mentioned unit primary frequency modulation and load frequency modulation function have all discharged, direct power supply electrical network continues the frequency of occurrences when falling, and starts to start according to the low cut net internal loading function of direct power supply electrical network, concrete low frequency first round operating value is 49.0Hz, 0.2S.
The invention has the beneficial effects as follows: the present invention solves large power supply under there is low frequency situation in large load direct power supply system is normally run and netted, coordinated by the tight CCS between the low cut part-load operation three of unit primary frequency modulation, load frequency modulation and safety stabilization control system, guarantee power grid operation.Ensure the action message of safety stabilization control system low frequency function under the safe and stable operation of electrical network under normal circumstances and accident conditions, ensure the safety of equipment, the person.Solve in direct power supply system due to system low frequency problem that electrolytic aluminium anode effect, change poles etc. cause, reach the safe and stable operation of direct power supply system, improve the economic benefit of Aluminum Electrolysis Production, discharge unit Primary frequency control ability completely, and the unit primary frequency modulation action frequency obviously reduces, ensure that the normal operation of electrical network.Be applicable to large power supply good to the low frequency control effects in large load direct power supply system electrical network.Electrolytic aluminium side of the present invention frequency modulation speed, when the slip of electrical network occurrence frequency, can utilize and regulate fast, recovery system is stablized, and avoids the problem of netting interior low frequency load shedding.
figure of description
Fig. 1. be prior art frequency glide figure of the present invention;
Fig. 2. be prior art frequency variation curve figure of the present invention;
Fig. 3. be unit Primary frequency control ability trial curve figure under the different control model of the present invention.
Embodiment
A kind of large power supply, to electrical network low frequency control method in large load direct power supply system, specifically comprises the following steps:
1, according to electrolytic aluminium part throttle characteristics actual in direct power supply system, find system frequency fluctuation range in net, progressively adjust unit primary frequency modulation deadzone parameter setting value, find that system frequency suspension value is 49.6Hz, then according to frequency suspension value adjustment unit primary frequency modulation dead band extremely-24rpm; The primary frequency modulation dead band (normal grid lower limit is-12rpm) of suitable amplification unit, and differentiation setting is carried out in the primary frequency modulation dead band of the interior unit of net, and (the first frequency modulation unit is-24rpm, second frequency modulation unit is-28rpm, and the 3rd frequency modulation unit is-30rpm).
2, in net, under equal load disturbance, under different control model (CCS, power control, valve control), find unit Primary frequency control ability, concrete trial curve as shown in Figure 3, initially exert oneself 210MW, disturbance+28MW by unit.Finally determine the preferred CCS pattern of unit primary frequency modulation, under determining prioritizing selection CCS pattern, carry out primary frequency modulation, when CCS pattern cannot drop into, selector valve prosecutor formula.
3, there is following difference in direct power supply electrical network and bulk power grid: in bulk power grid net, unit number of units is many, and total pondage is abundant, and can meet system hot standby with 5% ~ 10% requirement; Net capacity is high, and inertia is large, and the possibility that generation the whole network frequency is fallen is little; Load radix is large, and load type is various, and the frequency regulation characteristics of load can not be ignored.And direct power supply electrical network, though the frequency modulation amplitude limit scheme of bulk power grid can reference, can not indiscriminately imitate; In addition, when utilizing Safety system unit shut algorithm measure in direct power supply electrical network, means are limited, object is single, and are difficult to snugly and solve contingent unbalanced power disturbance.Therefore, for this type of direct power supply electrical network, the Primary frequency control ability of Key generating unit should be given full play to, finally determine that unit frequency modulation amplitude is arranged according to 10% of unit rated load, guarantee that the standby capacity that always revolves that can recall in electrical network meets service requirement.
4, when direct power supply electrical network occurs still can not maintaining mains frequency after unit Primary frequency control ability discharges completely, frequency modulation function is increased in load side.When electrolytic aluminium control system monitoring system frequency reaches 49.3 ~ 49.0Hz, electrolytic aluminium control system frequency modulation control logic starts immediately, adjustment current stabilization control objectives value, point 3 grades (2%-1%-1%) unidirectional load shedding mode adjust that electrolytic aluminium load is electrolytic aluminium total load 4%.
5, after above-mentioned unit primary frequency modulation and load frequency modulation function have all discharged, direct power supply electrical network continues the frequency of occurrences when falling, start to start according to the low cut net internal loading function of direct power supply electrical network, concrete low frequency first round operating value is 49.0Hz, 0.2S.
Claims (3)
1. a large power supply is to electrical network low frequency control method in large load direct power supply system, it is characterized in that: formulate unit primary frequency modulation deadband lower limit parameter, electrolytic aluminium chirp parameter according to electrolytic aluminium part throttle characteristics, optimize safety stabilization control system, low cut controling parameters is set; Specifically comprise the following steps:
A, according to electrolytic aluminium part throttle characteristics actual in direct power supply system, find system frequency fluctuation range in net, progressively adjust unit primary frequency modulation deadzone parameter setting value, unit primary frequency modulation deadband lower limit parameter-24rpm is set according to frequency suspension value 49.6Hz; And suitably amplifying the primary frequency modulation deadzone parameter of unit in net, the first frequency modulation unit is less than the second frequency modulation unit, and the second frequency modulation unit is less than the 3rd frequency modulation unit;
B, in net, under equal load disturbance, under CCS, power control, valve control difference control model, select the control model of unit Primary frequency control ability the best;
C, determine that unit frequency modulation amplitude is arranged according to 10% of unit rated load, guarantee that the standby capacity that always revolves that can recall in electrical network meets service requirement;
D., when direct power supply electrical network occurs still can not maintaining mains frequency after unit Primary frequency control ability discharges completely, frequency modulation function is increased in load side.
2. reach 49.3 ~ 49.0Hz when electrolytic aluminium control system monitoring system frequency, electrolytic aluminium control system frequency modulation control logic starts immediately, adjustment current stabilization control objectives value, points of 3 grades unidirectional load shedding modes adjust that electrolytic aluminium load is electrolytic aluminium total load 4%.
3. a kind of large power supply according to claim 1 is to electrical network low frequency control method in large load direct power supply system, it is characterized in that: after above-mentioned unit primary frequency modulation and load frequency modulation function have all discharged, direct power supply electrical network continues the frequency of occurrences when falling, start to start according to the low cut net internal loading function of direct power supply electrical network, concrete low frequency first round operating value is 49.0Hz, 0.2S.
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| CN201510211008.7A CN104779619B (en) | 2015-04-29 | 2015-04-29 | A kind of big power supply is to power network low frequency control method in big load direct-furnish electric system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829445A (en) * | 2019-10-18 | 2020-02-21 | 酒泉钢铁(集团)有限责任公司 | Load shedding control method for power supply system of electrolytic aluminum production line |
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| CN103777556A (en) * | 2014-02-12 | 2014-05-07 | 国家电网公司 | Priority adjusting method and system for primary frequency modulation of unit plant |
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Patent Citations (5)
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| CN102074957A (en) * | 2010-12-24 | 2011-05-25 | 中国长江三峡集团公司 | Primary frequency regulation and automatic generation control (AGC) load regulation coordinated control method |
| CN102891495A (en) * | 2012-09-18 | 2013-01-23 | 中国电力科学研究院 | Method used for controlling participation of battery energy storing system in primary frequency modulation and optimization of power gird |
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| CN110829445A (en) * | 2019-10-18 | 2020-02-21 | 酒泉钢铁(集团)有限责任公司 | Load shedding control method for power supply system of electrolytic aluminum production line |
| CN110829445B (en) * | 2019-10-18 | 2023-03-24 | 酒泉钢铁(集团)有限责任公司 | Load shedding control method for power supply system of electrolytic aluminum production line |
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