CN103606938B - Aluminium electroloysis industry thyristor rectifier device control system used under a kind of isolated power grid - Google Patents
Aluminium electroloysis industry thyristor rectifier device control system used under a kind of isolated power grid Download PDFInfo
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Abstract
Aluminium electroloysis industry thyristor rectifier device control system used under a kind of isolated power grid, comprise the rectifying installation n1 guaranteeing power plant for self-supply's generating set safety, load down protects the stable rectifying installation n2 of mains frequency, and each machine set PLC control device adjusts PLC control device with total, adopt the mode of ControlNet double-network redundant between described total tune PLC control device and each machine set PLC control device, each machine set PLC control device and background monitoring room adopt ethernet communication mode to be connected; When power plant for self-supply generating set is abnormal cause frequency decrease to need load shedding time, rectifying installation n1 detects in time rapidly and accurately makes corresponding judgement, the function from motion tracking electrolytic series electric current removed immediately by total tune PLC control device, controlled to be converted to power limitation control by current stabilization.Native system passes through the steady flow system of network communication fast reliably and wideband, can realize real-time regulating load size, thus reach generating set stabilized frequency, protect the object of whole electric power system stable operation.
Description
Technical field
The present invention relates to aluminium electroloysis industry thyristor rectifier device control system used under a kind of isolated power grid, mainly refer to the method that the method for UFLS quick accurate adjustment unit output load and the dual network redundancy communication of the whole control system of isolated power grid realize under isolated power grid.
Background technology
Aluminum electrolysis industry is high energy consumption industry, in order to reduce production cost, many aluminium electrolysis enterprises propose and use power plant for self-supply to power (lonely net power supply) scheme, production cost can be reduced to greatest extent like this and can effectively save a large amount of electric energy, but the fluctuation because of electric load is impacted and is made generating set can not stable operation, makes its security performance be difficult to be protected.Namely to meet Production requirement and take into account power plant for self-supply's generating set safety again, so seek a kind of rectify control method be applied under isolated power grid under aluminium electrolysis commutator device completely newly, can not only effectively reach above effect, more Coal Energy Source can also be saved for China.
Summary of the invention
Its object of the present invention is just to provide aluminium electroloysis industry thyristor rectifier device used under a kind of isolated power grid
Control system, native system passes through the steady flow system of network communication fast reliably and wideband, can realize real-time regulating load size, thus reach generating set stabilized frequency, protect the order of whole electric power system stable operation.
Realize above-mentioned purpose and the technical scheme taked, comprise the rectifying installation n1 guaranteeing power plant for self-supply's generating set safety, load down protects the stable rectifying installation n2 of mains frequency, and each machine set PLC control device adjusts PLC control device with total, adopt the mode of ControlNet double-network redundant between described total tune PLC control device and each machine set PLC control device, each machine set PLC control device and background monitoring room adopt ethernet communication mode to be connected; When power plant for self-supply generating set is abnormal cause frequency decrease to need load shedding time, rectifying installation n1 detects in time rapidly and accurately makes corresponding judgement, the function from motion tracking electrolytic series electric current removed immediately by total tune PLC control device, controlled to be converted to power limitation control by current stabilization, frequency stabilization load reduction control system needs stable output load to adjust the load of power plant's needs minimizing quickly and accurately according to power plant for self-supply, guarantee invariable power, make mains frequency fast and stable.
Compared with prior art the present invention has the following advantages.
The present invention passes through the steady flow system of network communication fast reliably and wideband, realizes real-time regulating load size, thus reaches generating set stabilized frequency, protect whole electric power system stable operation.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is this device embodiment Large aluminum electrolytic plant electric hookup;
Fig. 2 is this device low frequency Control of decreasing load flow chart;
Fig. 3 is that this device low frequency off-load external lock pulse mode catches oscillogram;
Fig. 4 is this apparatus system network communication structure chart.
Embodiment
Native system comprises the rectifying installation n1 guaranteeing power plant for self-supply's generating set safety, load down protects the stable rectifying installation n2 of mains frequency, and each machine set PLC control device adjusts PLC control device with total, as shown in Figure 1,3, adopt the mode of ControlNet double-network redundant between described total tune PLC control device and each machine set PLC control device, each machine set PLC control device and background monitoring room adopt ethernet communication mode to be connected; When power plant for self-supply generating set is abnormal cause frequency decrease to need load shedding time, rectifying installation n1 detects in time rapidly and accurately makes corresponding judgement, the function from motion tracking electrolytic series electric current removed immediately by total tune PLC control device, controlled to be converted to power limitation control by current stabilization, frequency stabilization load reduction control system needs stable output load to adjust the load of power plant's needs minimizing quickly and accurately according to power plant for self-supply, guarantee invariable power, make mains frequency fast and stable.
Speed according to system power vacancy size and frequency decrease is divided into several interval needing the load reduced, when actual frequency is low to moderate the first interval, reduce each unit electric current according to the ratio of setting and perform first round excision load, load power and frequency proportional, if power disappearance is larger, when frequency continuation decline enters the second interval, perform second and take turns excision load; By that analogy, until the stable end of mains frequency.
The present invention is mainly for the aluminium electrical travelling industry being applied to lonely net frequency stabilization, when power plant for self-supply is owing to running electric set electric supply scarce capacity (the power-supply system frequency of occurrences is abnormal), the total capacity being less than load as generator total capacity acquires a certain degree, generator can not keep rated speed, so in factory, the frequency of electrical network will reduce, time serious, generator even can be caused to be tending towards stall, i.e. system cycle collapse.At this moment rectification control system needs detect in time rapidly and accurately make corresponding judgement, when detecting that power generator class frequency declines, total tune PLC removes the function from motion tracking electrolytic series electric current immediately, controlled to be converted to power limitation control by current stabilization, frequency stabilization load reduction control system needs stable output load according to power plant for self-supply, adjusts the load that power plant needs to reduce quickly and accurately.By the quantity that adjustment Rectification Power Factor is run, or reduced the operating current of unit by the adjustment IGBT group moment, guarantee invariable power, make mains frequency fast and stable.So namely ensure power plants generating electricity unit safety, the stable operation of electrolysis tank can be met again.
Due to powered operation structure special like this, quite harsh for this process entails of UFLS, current stabilization control system is from receiving frequency anomaly, then to making off-load until whole mains frequency is stablized, this process entails must be accurate and reliable rapidly.Whole time requirement will control to complete within 100MS, just because of this, and must be accurately and reliably for the communication between total tune PLC and each machine set PLC.The present invention adjusts total the mode adopting ControlNet double-network redundant between PLC and each machine set PLC, each PLC and background monitoring room adopt ethernet communication mode, so namely, ensure that Controling network swap data between current stabilization control system by the interference of background monitoring data, also ensure that reliability and the rapidity of each network simultaneously.
Accompanying drawing 1 is this device embodiment Large aluminum electrolytic plant electric hookup, and electrolytic aluminium factory is powered and to be made up of power plant for self-supply and local power network, and aluminium manufacturer is also power plant for self-supply's basic load source.Powered by I mother by power plant for self-supply during normal power supply, local power network is in II female hot standby state, when power plant for self-supply breaks down, load down instruction is sent to total PLC by power plant, now 4-9# Rectification Power Factor reduces load on request and meets power plant for self-supply's demand, and 1-3# Rectification Power Factor will maintain that current output is constant maintains the operation of electrolysis tank and the basic load as power plant for self-supply.As power plant for self-supply's fault continues, can be powered to 1-3# unit by II female continuation by local power network, keep the basic operation of electrolysis tank.
Accompanying drawing 2 is aluminium electrolysis commutator device low frequency Control of decreasing load flow chart, comprise UFLS program major control flow process under isolated power grid, after total PLC has detected UFLS signal, exit normal current stabilization control logic at once, lock this power plant for self-supply and the current flow of local power network simultaneously time, as requested, the rated value of load to defined of local power network falls.Judge that whether the frequency after off-load is normal, if normally, then return to normal current stabilization control program, if also abnormal, again perform above operation.
Accompanying drawing 3 is that low frequency off-load external lock pulse mode catches oscillogram, is experimental waveform data, after total PLC receives UFLS signal, orders each unit to start to lock pulse, until load drops to zero time spent completely.
Accompanying drawing 4 is aluminium electrolysis commutator grid communication structure figure under isolated power grid, be made up of two communication networks, the mode of ControlNet double-network redundant is adopted between total tune PLC and each machine set PLC, communication speed can reach 7ms, each PLC and background monitoring room adopt fiber optic Ethernet communication modes, so namely, ensure that Controling network swap data between current stabilization control system by the interference of background monitoring data, also ensure that reliability and the rapidity of each network simultaneously.
Claims (2)
1. aluminium electroloysis industry thyristor rectifier device control system used under an isolated power grid, comprise the rectifying installation n1 guaranteeing power plant for self-supply's generating set safety, load down protects the stable rectifying installation n2 of mains frequency, and each machine set PLC control device adjusts PLC control device with total, it is characterized in that, adopt the mode of ControlNet double-network redundant between described total tune PLC control device and each machine set PLC control device, each machine set PLC control device and background monitoring room adopt ethernet communication mode to be connected; When power plant for self-supply generating set is abnormal cause frequency decrease to need load shedding time, rectifying installation n1 detects in time rapidly and accurately makes corresponding judgement, the function from motion tracking electrolytic series electric current removed immediately by total tune PLC control device, controlled to be converted to power limitation control by current stabilization, frequency stabilization load reduction control system needs stable output load to adjust the load of power plant's needs minimizing quickly and accurately according to power plant for self-supply, guarantee invariable power, make mains frequency fast and stable.
2. aluminium electroloysis industry thyristor rectifier device control system used under a kind of isolated power grid according to claim 1, it is characterized in that, speed according to system power vacancy size and frequency decrease is divided into several interval needing the load reduced, when actual frequency is low to moderate the first interval, reduce each unit electric current according to the ratio of setting and perform first round excision load, load power and frequency proportional, if power disappearance is larger, when frequency continuation decline enters the second interval, perform second and take turns excision load; By that analogy, until the stable end of mains frequency.
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Families Citing this family (10)
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| CN104805470B (en) * | 2015-04-29 | 2017-05-31 | 酒泉钢铁(集团)有限责任公司 | A kind of verification method of 500kA electrolytic aluminiums DC current and AC power corresponding relation |
| CN106208087B (en) * | 2016-08-02 | 2019-05-21 | 南京南瑞继保电气有限公司 | A kind of industrial enterprise's self power generation method for controlling power balance |
| CN107740142B (en) * | 2017-10-18 | 2019-05-17 | 九江赛晶科技股份有限公司 | A kind of interior lower thyristor rectifier device redundancy handover control system of compensation operation of aluminium cell |
| CN108808688B (en) * | 2018-07-04 | 2021-07-02 | 云南电网有限责任公司 | Stable control load shedding method based on electrolytic aluminum control characteristics |
| CN109687579A (en) * | 2018-12-13 | 2019-04-26 | 九江赛晶科技股份有限公司 | A kind of fairing isolated network recovery electrolytic aluminium load control system |
| CN109735874B (en) * | 2019-03-21 | 2021-03-16 | 钱乙卫 | Optimized regulation and control method and control system for electrolytic aluminum load |
| CN110176783A (en) * | 2019-05-29 | 2019-08-27 | 湖南力宇新能源科技有限公司 | The power regulating method and device of generating set |
| 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 |
| CN112636365A (en) * | 2020-11-11 | 2021-04-09 | 九江赛晶科技股份有限公司 | Method for controlling power constancy of high-power rectifying device |
| CN112564515A (en) * | 2020-12-22 | 2021-03-26 | 哈尔滨工业大学 | 560kA aluminum electrolysis power supply system based on switching control and control method thereof |
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Address after: 332000, Jiujiang Development Zone, Jiangxi West Port, Hong Kong Road, the middle Patentee after: JIUJIANG SAIJING TECHNOLOGY CO., LTD. Address before: 332000, Jiujiang Development Zone, Jiangxi West Port, Hong Kong Road, the middle Patentee before: Jiujiang Jiuzheng Rectifier Co., Ltd. |