CN105317474B - A kind of power plant additional steam turbine band Frequency auxiliary system and control method - Google Patents

A kind of power plant additional steam turbine band Frequency auxiliary system and control method Download PDF

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Publication number
CN105317474B
CN105317474B CN201510539447.0A CN201510539447A CN105317474B CN 105317474 B CN105317474 B CN 105317474B CN 201510539447 A CN201510539447 A CN 201510539447A CN 105317474 B CN105317474 B CN 105317474B
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steam turbine
subsidiary engine
control
cluster
additional steam
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CN105317474A (en
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赵玉柱
李明
鄢传武
沈敏
李国敏
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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Abstract

The present invention relates to a kind of power plant additional steam turbine band Frequency auxiliary system and control method.There is presently no a kind of such system and control method for greatly improving generating efficiency.System of the invention includes subsidiary engine device cluster, is characterized in:Also include additional steam turbine, generator, transformer, subsidiary engine bus, steam turbine speed control device, and DCS control systems;Steam turbine speed control device and additional steam turbine are connected, and transformer and subsidiary engine bus are connected, and subsidiary engine bus and subsidiary engine device cluster are connected.The step of control method of the invention is:DCS control systems frequency conversion magnitude of voltage according to needed for fired power generating unit information on load at that time and subsidiary engine device cluster produces a suitable control instruction, during the control instruction acted on into steam turbine speed control device, produce the voltage of 20~50HZ, voltage that each subsidiary engine equipment in subsidiary engine device cluster is delivered directly to by subsidiary engine bus by generator and transformer.Reasonable in design of the invention, greatly improves generating efficiency.

Description

A kind of power plant additional steam turbine band Frequency auxiliary system and control method
Technical field
The present invention relates to a kind of power plant additional steam turbine band Frequency auxiliary system and control method, it is mainly used in power plant In, generated electricity using auxiliary vapour and used for station service, and variable-frequency electric can be produced to press and realize that multiple frequency conversion subsidiary engines run.
Background technology
Country requires thermal power generation corporations to improve the generating efficiency of unit as far as possible now, while reach certain energy-conservation subtracting Row requires that the cycling and reutilization for particularly reducing station-service Generation Rate working medium related to generating set will have very big prospect.
Also there is the system that steam turbine energy recovery is utilized now, such as publication date is 01 month 2012 25 days, Publication No. In the Chinese patent of CN102330579A, disclose a kind of steam power plant and reclaim main and auxiliary machine condensation waste heat combined heating system, should Steam power plant reclaims main and auxiliary machine condensation waste heat combined heating system includes sucking condensing turbine, main steam turbine extraction steam pipe, the first water Cold condenser, auxiliary steam turbine, the second water-cooled condenser, water water- to-water heat exchanger, subcooler, vapor-water heat exchanger and absorption heat pump, heat Net backwater is divided into two tunnels before or after water water- to-water heat exchanger is entered, and heat supply network backwater is introduced into First absorption heat pump (XR1) all the way Absorber after be connected in series each absorption heat pump (XR1 ... n), enter again after going out n-th absorber of absorption heat pump (XRn) Enter n-th condenser of absorption heat pump, then series connection accesses each condenser of absorption heat pump, another road heat supply network backwater Parallel connection enters the subcooler (9) of each absorption heat pump, after two road heat supply network backwater finally merge, it is direct or reheated after give Go out, the system is used only for reclaiming the condensation waste heat of more steam power plants, does not possess and uses waste-heat power generation, and electric energy is used for power plant The function of electricity.
There is presently no a kind of reasonable in design, dependable performance, power plant that is energy-saving, greatly improving generating efficiency are attached Plus steam turbine band Frequency auxiliary system and control method.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and a kind of reasonable in design is provided, Dependable performance, power plant that is energy-saving, greatly improving generating efficiency additional steam turbine band Frequency auxiliary system and control method.
The present invention the used technical scheme that solves the above problems is:The additional steam turbine band Frequency auxiliary system of the power plant Including subsidiary engine device cluster, its design feature is:It is additional that the auxiliary vapour for also being produced using power plant's main steam turbine is done work Steam turbine, done work the generator for being generated electricity by additional steam turbine, and the voltage for generator to be exported is transformed into frequency and is The transformer of 20HZ~50HZ, the frequency for transformer to be exported is that the voltage of 20HZ~50HZ is delivered directly to subsidiary engine equipment The subsidiary engine bus of group, the steam turbine speed control device for adjusting additional steam turbine power and rotating speed, and according to subsidiary engine device cluster Feedback information with steam turbine speed control device controls the DCS control systems of steam turbine speed control device;The steam turbine speed control device With the connection of additional steam turbine, the additional steam turbine and generator are connected, and the generator and transformer are connected, the transformer With the connection of subsidiary engine bus, the subsidiary engine bus and subsidiary engine device cluster are connected, and the subsidiary engine device cluster and steam turbine speed control device are equal It is connected with DCS control systems.
Preferably, additional steam turbine of the present invention is the adjustable steam turbine of rotating speed.
Preferably, subsidiary engine bus of the present invention is variable ratio frequency changer subsidiary engine bus.
Preferably, subsidiary engine device cluster of the present invention is variable-ratio subsidiary engine device cluster.
A kind of described power plant's control method of the additional steam turbine with Frequency auxiliary system, its feature is:The control The step of method, is as follows:DCS control systems variable-frequency electric according to needed for fired power generating unit information on load at that time and subsidiary engine device cluster Pressure value produces a suitable control instruction, during the control instruction acted on into steam turbine speed control device, for controlling entrance attached Plus the auxiliary steam flow amount in steam turbine so that corresponding auxiliary vapour does work into additional steam turbine and produces 1200 revs/min~3000 Rev/min rotating speed, it is the voltage of 20HZ~50HZ then to produce frequency by generator and transformer, and the voltage passes through subsidiary engine Bus is delivered directly to each subsidiary engine equipment in subsidiary engine device cluster, and each subsidiary engine equipment exerts oneself to maintain unit accordingly The requirement of each working medium;In above process, DCS control systems constantly receive in steam turbine speed control device and subsidiary engine device cluster each The state feedback information of subsidiary engine equipment, and the feedback information that will be obtained contrasted with the workload demand of fired power generating unit at that time, no Stopping pregnancy life adjustment signal, and adjustment signal is directly acted on into steam turbine speed control device, so as to form a complete closed loop certainly Autocontrol system.
Preferably, the present invention is required by after DCS control system computings, controlling according to the varying load condition of fired power generating unit Steam turbine speed control device, realizes the regulation of additional steam turbine power and rotating speed.
Preferably, the present invention realizes that the auxiliary vapour produced using power plant's main steam turbine drives additional steam turbine acting, produce Variable-frequency electric pressure direct drive subsidiary engine device cluster in subsidiary engine equipment, reach and realize what subsidiary engine equipment frequency conversion was exerted oneself without frequency converter Purpose, runs subsidiary engine equipment high efficiency, while the auxiliary vapour that work(is finished in additional steam turbine is still utilized for heat supply, to reduce station-service Electric rate, improve and unit whole efficiency and realize reusing of energy source.
Preferably, suitable control instruction of the present invention refers to meet fired power generating unit normally operation and subsidiary engine equipment Control instruction when group normally runs.
The present invention compared with prior art, with advantages below and effect:
1st, can Efficient Cycle recycle the high pressure-temperature vapour source being pooled in auxiliary vapour header after the acting of original main frame, realize auxiliary Vapour is recycled after generating electricity for station service use, enters back into heating system, fully reuses the HTHP energy in auxiliary vapour, real The cascade utilization of the auxiliary vapour energy is showed.
2nd, expense is low, the huge installation cost of often set frequency conversion subsidiary engine purchase configuration frequency converter can be significantly saved, while also avoiding Later stage expensive frequency conversion installation and debugging expense and frequency conversion equipment maintenance cost etc..
3rd, simple structure, design are unique, easy to implement, are conducive to the variable-frequency electric produced by the present invention to press and realize with multiple Frequency conversion subsidiary engine runs, so as to station service power consumption rate is greatly reduced, while saving electric energy that can be effectively and reasonably by subsidiary engine converting operation Consumption, and greatly improve the generating efficiency of unit.
4th, because the present invention can also include DCS system overall-in-one control schema, therefore DCS system associated control logic also can be more Plus it is effective the control of whole unit load is effectively dispatched, more quick responsive electricity grid will to the load variations of unit Ask.
Brief description of the drawings
Fig. 1 is power plant's structural representation of the additional steam turbine with Frequency auxiliary system in the embodiment of the present invention.
In figure:1st, additional steam turbine;2nd, generator;3rd, transformer;4th, subsidiary engine bus;5th, subsidiary engine device cluster;6th, DCS controls System;7th, steam turbine speed control device.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following examples are to this hair Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1, the additional steam turbine band Frequency auxiliary system of power plant in the present embodiment includes subsidiary engine device cluster 5, profit The additional steam turbine 1 that the auxiliary vapour that electricity consumption factory owner steam turbine is produced is done work, done work the hair for being generated electricity by additional steam turbine 1 Motor 2, for the voltage that generator 2 is exported to be transformed into the transformer 3 that frequency is 20HZ~50HZ, for transformer 3 is defeated The frequency for going out is delivered directly to the subsidiary engine bus 4 of subsidiary engine device cluster 5 for the voltage of 20HZ~50HZ, for adjusting additional steam turbine The steam turbine speed control device 7 of 1 power and rotating speed, and according to the feedback information control of subsidiary engine device cluster 5 and steam turbine speed control device 7 The DCS control systems 6 of steam turbine speed control device 7 processed.
Steam turbine speed control device 7 and additional steam turbine 1 in the present embodiment are connected, and additional steam turbine 1 and generator 2 connect Connect, generator 2 and transformer 3 are connected, transformer 3 and subsidiary engine bus 4 are connected, subsidiary engine bus 4 and subsidiary engine device cluster 5 are connected, auxiliary Machine equipment group 5 and steam turbine speed control device 7 are connected with DCS control systems 6.
Under normal circumstances, the additional steam turbine 1 in the present embodiment is the adjustable steam turbine of rotating speed, and subsidiary engine bus 4 is variable ratio frequency changer Subsidiary engine bus, subsidiary engine device cluster 5 is variable-ratio subsidiary engine device cluster.
It is as follows the step of control method of the additional steam turbine of power plant with Frequency auxiliary system in the present embodiment:DCS is controlled The frequency conversion magnitude of voltage according to needed for fired power generating unit information on load at that time and subsidiary engine device cluster 5 of system 6 produces a suitable control System instruction, during the control instruction acted on into steam turbine speed control device 7, for the auxiliary steam flow for controlling to enter in additional steam turbine 1 Amount so that corresponding auxiliary vapour does work into additional steam turbine 1 and produces 1200 revs/min~3000 revs/min of rotating speed, then It is the voltage of 20HZ~50HZ to produce frequency by generator 2 and transformer 3, and the voltage is delivered directly to by subsidiary engine bus 4 Each subsidiary engine equipment in subsidiary engine device cluster 5, each working medium that each subsidiary engine equipment is exerted oneself to maintain unit accordingly is required; In above process, DCS control systems 6 constantly receive each subsidiary engine equipment in steam turbine speed control device 7 and subsidiary engine device cluster 5 State feedback information, and the feedback information that will be obtained contrasted with the workload demand of fired power generating unit at that time, constantly produces adjustment Signal, and adjustment signal is directly acted on into steam turbine speed control device 7, so as to form a complete closed-loop automatic control system System.
The present embodiment is according to the varying load condition requirement of fired power generating unit by after the computing of DCS control systems 6, controlling steam turbine Arrangements for speed regulation 7, realize the regulation of the power of additional steam turbine 1 and rotating speed.
The present embodiment realizes that the auxiliary vapour produced using power plant's main steam turbine drives additional steam turbine 1 to do work, the frequency conversion of generation Subsidiary engine equipment in voltage direct drive subsidiary engine device cluster 5, reaches and realizes the purpose that subsidiary engine equipment frequency conversion is exerted oneself without frequency converter, Subsidiary engine equipment high efficiency is run, while the auxiliary vapour that work(is finished in additional steam turbine 1 is still utilized for heat supply, to reduce station service Rate, improve and unit whole efficiency and realize reusing of energy source.
Suitable control instruction refers to meet fired power generating unit normally operation and the normal fortune of subsidiary engine device cluster 5 in the present embodiment Control instruction during row, this is to those skilled in the art common knowledge.
Containing the control logic to steam turbine speed control device 7 in the present embodiment DCS control systems 6, according to fired power generating unit Varying load condition requirement is by the way that after DCS control logic computings, control steam turbine speed control device 7 realizes the work(to additional steam turbine 1 Rate and rotational speed regulation.Auxiliary vapour leads into after additional steam turbine 1 after the rotating speed of 1200 revs/min to 3000 revs/min of acting generation Cross generator 2 and transformer 3 produces the frequency conversion voltage that frequency is 20HZ to 50HZ, related frequency conversion voltage is straight by subsidiary engine bus 4 Connect and be supplied to subsidiary engine device cluster 5 to be powered, relevant device is met the normal economical operation demand of unit.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components Claiming etc. can be with difference, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims Scope defined in book, all should belong to protection scope of the present invention.

Claims (4)

1. control method of the additional steam turbine of a kind of power plant with Frequency auxiliary system, the additional steam turbine band Frequency of power plant Auxiliary system includes subsidiary engine device cluster(5), the additional steam turbine that the auxiliary vapour produced using power plant's main steam turbine is done work(1), By additional steam turbine(1)The generator that acting is generated electricity(2), for by generator(2)The voltage of output is transformed into frequency It is the transformer of 20HZ~50HZ(3), for by transformer(3)The frequency of output is delivered directly to for the voltage of 20HZ~50HZ Subsidiary engine device cluster(5)Subsidiary engine bus(4), for adjusting additional steam turbine(1)The steam turbine speed control device of power and rotating speed (7), and according to subsidiary engine device cluster(5)With steam turbine speed control device(7)Feedback information control steam turbine speed control device(7)'s DCS control systems(6);The steam turbine speed control device(7)With additional steam turbine(1)Connection, the additional steam turbine(1)And hair Motor(2)Connection, the generator(2)And transformer(3)Connection, the transformer(3)With subsidiary engine bus(4)Connection, it is described Subsidiary engine bus(4)With subsidiary engine device cluster(5)Connection, the subsidiary engine device cluster(5)With steam turbine speed control device(7)Controlled with DCS System processed(6)Connection, it is characterised in that:The step of control method, is as follows:DCS control systems(6)According to thermoelectricity at that time Unit load information and subsidiary engine device cluster(5)Required frequency conversion magnitude of voltage produces a suitable control instruction, and the control is referred to Order acts on steam turbine speed control device(7)In, for controlling to enter additional steam turbine(1)In auxiliary steam flow amount so that it is corresponding Auxiliary vapour enters additional steam turbine(1)1200 revs/min~3000 revs/min of rotating speed is done work and produces, then by generator (2)And transformer(3)It is the voltage of 20HZ~50HZ to produce frequency, and the voltage passes through subsidiary engine bus(4)It is delivered directly to subsidiary engine Device cluster(5)In each subsidiary engine equipment, each working medium that each subsidiary engine equipment is exerted oneself to maintain unit accordingly requires; DCS control systems(6)Constantly receive steam turbine speed control device(7)With subsidiary engine device cluster(5)In each subsidiary engine equipment state it is anti- Feedforward information, and the feedback information that will be obtained contrasted with the workload demand of fired power generating unit at that time, constantly produces adjustment signal, and Adjustment signal is directly acted on into steam turbine speed control device(7), so as to form a complete closed loop automatic control system.
2. control method of the additional steam turbine of power plant according to claim 1 with Frequency auxiliary system, it is characterised in that: Varying load condition requirement according to fired power generating unit passes through DCS control systems(6)After computing, steam turbine speed control device is controlled(7), it is real Existing additional steam turbine(1)The regulation of power and rotating speed.
3. control method of the additional steam turbine of power plant according to claim 1 with Frequency auxiliary system, it is characterised in that: Realize that the auxiliary vapour produced using power plant's main steam turbine drives additional steam turbine(1)Acting, the variable-frequency electric pressure direct drive of generation is auxiliary Machine equipment group(5)In subsidiary engine equipment, reach and realize the purpose that subsidiary engine equipment frequency conversion is exerted oneself without frequency converter, make subsidiary engine equipment high Effect operation, while additional steam turbine(1)In finish the auxiliary vapour of work(and still utilized for heat supply, to reduce station service power consumption rate, improve unit Whole efficiency and realize reusing of energy source.
4. control method of the additional steam turbine of power plant according to claim 1 with Frequency auxiliary system, it is characterised in that: The suitable control instruction refers to meet fired power generating unit normally operation and subsidiary engine device cluster(5)Control during normal operation refers to Order.
CN201510539447.0A 2015-08-30 2015-08-30 A kind of power plant additional steam turbine band Frequency auxiliary system and control method Active CN105317474B (en)

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CN106208153B (en) * 2016-07-27 2018-09-18 西安西热节能技术有限公司 A kind of power generation station-service subsidiary engine system tune power source system
CN106285918B (en) * 2016-10-13 2019-04-02 福州大学 Bi-motor turbocharging power generation device and its control method

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CN103195522A (en) * 2013-04-09 2013-07-10 上海吴泾第二发电有限责任公司 Frequency conversion control method of circulating water pumps of two steam turbine generator sets
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