CN104779616A - High-frequency control method for power grid in large power supply to large load direct power supply system - Google Patents
High-frequency control method for power grid in large power supply to large load direct power supply system Download PDFInfo
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- CN104779616A CN104779616A CN201510210772.2A CN201510210772A CN104779616A CN 104779616 A CN104779616 A CN 104779616A CN 201510210772 A CN201510210772 A CN 201510210772A CN 104779616 A CN104779616 A CN 104779616A
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Abstract
The invention discloses a high-frequency control method for a direct power supply system. The problems that in a large power supply to large load direct power supply system power grid, due to the fact that the capacity is small, generator sets and electric devices in the power grid are large in power ratio, the relative value between the output power variable quantity of the generator sets and load change amount is large, and the probability that high frequency occurs in the system is high for electrolytic aluminum loads are solved. The method is applicable to high-frequency control over the large power supply to large load direct power supply system power grid. According to the system high-frequency control in the direct power supply system, it is ensured that the power gird frequency is controllable and the power grid can safely and stably run by optimizing unit primary frequency modulation parameters and optimizing safety and stability control system high frequency high cutting machine function parameters in the power grid based on the load characteristic in the power grid.
Description
Technical field
The invention belongs to direct power supply mains frequency control method technical field, be specifically related to large power supply to power grid high-frequency control method in large load direct power supply system.
Background technology
Large power supply is to the anode effect of large load direct power supply system cloud gray model initial stage due to electrolytic aluminium load, and continuous slide appears in system frequency, drops to 48.922Hz by normal frequency 49.994Hz, have dropped 1.072Hz, and frequency change rate reaches 0.08787Hz/s.The stability control equipment of configuration reliably starts in system, and electrolytic aluminium control system is after performing the control command that stability control equipment sends, and the control ratio of active power is performed the control ratio into electrolytic aluminium rectification system inverter side direct current simply.And electrolytic aluminium control system essence is for stabling current, in execution pressure load process, cause the angle of flow to increase because electric current declines, direct voltage declines, thus exacerbates the decline of direct current active power.When this electrolytic aluminium control system performs pressure load instruction, theoretical excision load 50MW, actual excision load 98.84MW.And electrolytic aluminium control system excision duration of load application reaches 400ms.And above-mentioned actual electrolytic aluminium control system actual excision load, after drawing excision load by simulation analysis, in system, frequency peak reaches 51.4Hz, and frequency change rate reaches more than 0.86Hz/s.Finally cause netting interior unit OPC relative speed variation open and meet operation condition, cause large-sized unit tripping operation in net, and high week cut machine in net and do not play a role.
Following problem is there is to large load direct power supply system according to above-mentioned situation analysis large power supply:
1, unit OPC protects definite value to arrange unreasonable; 2, unit primary frequency modulation deadband upper limit value arranges less than normal, fails to avoid normal electrolytic aluminium anode effect; 3, stable high week cutting machine scheme in net arranges unreasonable, under there is high frequency situations, does not play due effect in net; 4, unit primary frequency modulation acts frequently.
Summary of the invention
Object of the present invention is exactly to provide a kind of by according to the load fluctuation situation in electrolytic aluminium normal course of operation, formulates the method that direct power supply system medium-high frequency controls.
The present invention is achieved through the following technical solutions:
Large power supply is to power grid high-frequency control method in large load direct power supply system; the method formulates unit primary frequency modulation deadband upper limit parameter according to electrolytic aluminium part throttle characteristics, unit OPC protects definite value, safety stabilization control system high-frequency cutting machine scheme, and the method is carried out according to following step:
(1) record net interior system frequency fluctuation higher limit, progressively adjusts unit primary frequency modulation deadzone parameter setting value, if system frequency upper limit suspension value is 50.4Hz, then according to frequency suspension value adjustment unit primary frequency modulation dead band extremely+24rpm;
(2) if after in net, unit primary frequency modulation plays completely, in net, frequency keeps rises, and when guaranteeing that netting interior electric equipment is not damaged, formulates in net and high week cuts machine functional parameter;
(3) determine to net interior unit OPC parameter, avoid netting interior unit OPC prior to netting interior high week and cut motor-driven work.
Compared with prior art, beneficial effect of the present invention is:
1) after improving, in net, the normal operating unit primary frequency modulation action frequency obviously reduces, and avoids and causes device damage because unit primary frequency modulation acts frequently, thus cause unit tripping, even the risk of direct power supply system inter-network.
2) although system frequency fluctuation range increases to some extent, direct power supply system is more stable, and can escape there is low frequency in the normal duty fluctuation of electrolytic aluminium and net after the direct power supply system height Zhou Wenti that causes of stable system cut-out electrolytic aluminium load.
3) avoid in unit OPC action that system high-frequency causes, net and high week cut motor-driven work, to the harmful effect that the normal production of electrolytic aluminium brings, affect economic benefit.
Accompanying drawing explanation
Fig. 1 is high frequency control logic block diagram of the present invention.
Embodiment
According to accompanying drawing, the present invention is described further below:
As shown in Figure 1; large power supply is to power grid high-frequency control method in large load direct power supply system; the method formulates unit primary frequency modulation deadband upper limit parameter according to electrolytic aluminium part throttle characteristics, unit OPC protects definite value, safety stabilization control system high-frequency cutting machine scheme, and the method is carried out according to following step:
(1) record net interior system frequency fluctuation higher limit, progressively adjusts unit primary frequency modulation deadzone parameter setting value, if system frequency upper limit suspension value is 50.4Hz, then according to frequency suspension value adjustment unit primary frequency modulation dead band extremely+24rpm;
(2) if after in net, unit primary frequency modulation plays completely, in net, frequency keeps rises, when guaranteeing that netting interior electric equipment is not damaged, formulate in net and high week cut machine functional parameter, the response characteristic of unit primary frequency modulation mainly comprises the peak load adjusting range of the load responding lag time of primary frequency modulation, primary frequency modulation.Load responding for fired power generating unit primary frequency modulation should be less than 3s lag time, and the peak load adjusting range of primary frequency modulation should reach 90% of the peak load adjusting range of primary frequency modulation in 15s.Consider that unit primary frequency modulation dead band the maximum is+30rpm, corresponding frequency is 50.5Hz, so on the basis that unit primary frequency function discharges completely, cut in system height week in suitable amplification direct power supply electrical network and motor-drivenly make definite value, and set certain time delay, cut in concrete high week and be motor-drivenly set to 51.8Hz as definite value, 0.4s;
(3) determine to net interior unit OPC parameter, avoid netting interior unit OPC prior to netting interior high week and cut motor-driven work.
3.1 are specially: OPC action, and turbo generator set is a large amount of admission suddenly again after all cutting off vapour source, and pressure reduction before and after between steam turbine dynamic and static leaf-size class at different levels will be caused like this to increase, and the impact stress that each grade blade is subject to is comparatively large, likely causes blade damage; OPC action, after steam turbine admission is all cut off, can cause pressure-containing member superpressure, safety valve action, and boiler combustion is unstable, and boiler superheater there will be instant steam and remains in a standstill, and the dangerous working condition of overtemperature can occur superheater; In addition, the rotating speed caused due to OPC action significantly changes, and likely causes the self-excited vibration of blade to increase, Steam Turbine support
bearingoil film unstable.
In 3.2 unit OPC actions should lag behind and net, safety stabilization control system cuts machine function in height week.
In view of above-mentioned two aspects; large power supply takes electrical network unit OPC fixed value adjusting principle of breaking the normal procedure in large load direct power supply electrical network; 3090r/min(51.5Hz by normal grid) relaxing to 3150r/min(52.5Hz of arranging), and eliminate " rotating speed growth rate " protection.
Claims (2)
1. large power supply is to power grid high-frequency control method in large load direct power supply system, it is characterized in that: the method formulates unit primary frequency modulation deadband upper limit parameter according to electrolytic aluminium part throttle characteristics, unit OPC protects definite value, safety stabilization control system high-frequency cutting machine scheme.
2. large power supply as claimed in claim 1 is to power grid high-frequency control method in large load direct power supply system, it is characterized in that: the method is carried out according to following step:
(1) record net interior system frequency fluctuation higher limit, progressively adjusts unit primary frequency modulation deadzone parameter setting value, if system frequency upper limit suspension value is 50.4Hz, then according to frequency suspension value adjustment unit primary frequency modulation dead band extremely+24rpm;
(2) if after in net, unit primary frequency modulation plays completely, in net, frequency keeps rises, and when guaranteeing that netting interior electric equipment is not damaged, formulates in net and high week cuts machine functional parameter;
Determine to net interior unit OPC parameter, avoid netting interior unit OPC prior to netting interior high week and cut motor-driven work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510210772.2A CN104779616A (en) | 2015-04-29 | 2015-04-29 | High-frequency control method for power grid in large power supply to large load direct power supply system |
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| CN201510210772.2A CN104779616A (en) | 2015-04-29 | 2015-04-29 | High-frequency control method for power grid in large power supply to large load direct power supply system |
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| CN104779616A true CN104779616A (en) | 2015-07-15 |
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Cited By (2)
| 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 |
| CN113833538A (en) * | 2021-08-31 | 2021-12-24 | 中国船舶重工集团公司第七0三研究所 | Operation control method of marine direct-current steam turbine generator unit |
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| CN102619580A (en) * | 2011-01-31 | 2012-08-01 | 华北电力科学研究院有限责任公司 | Method and system for controlling one-time frequency modulation |
| CN103633638A (en) * | 2013-11-06 | 2014-03-12 | 南方电网科学研究院有限责任公司 | Multi-direct-current-output island power grid frequency control strategy |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102619580A (en) * | 2011-01-31 | 2012-08-01 | 华北电力科学研究院有限责任公司 | Method and system for controlling one-time frequency modulation |
| CN103633638A (en) * | 2013-11-06 | 2014-03-12 | 南方电网科学研究院有限责任公司 | Multi-direct-current-output island power grid frequency control strategy |
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Cited By (4)
| 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 |
| 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 |
| CN113833538A (en) * | 2021-08-31 | 2021-12-24 | 中国船舶重工集团公司第七0三研究所 | Operation control method of marine direct-current steam turbine generator unit |
| CN113833538B (en) * | 2021-08-31 | 2024-05-17 | 中国船舶重工集团公司第七0三研究所 | Operation control method of marine direct-current steam turbine generator unit |
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Application publication date: 20150715 |
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