CN107769273B - Steam turbine load distribution control method and system - Google Patents
Steam turbine load distribution control method and system Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention relates to a steam turbine load distribution control method and a system, in particular to a relatively independently operated power station (including a power station operated by an isolated network) composed of a plurality of steam turbine generator units, which comprises the following steps: calculating output performance control command Δ Sout(ii) a Calculating the load closeness d of each unitiCalculating load nearness mean davg(ii) a Calculating to obtain a unit load distribution correction coefficient Ai(ii) a Controlling the command Δ S according to the output performanceoutThe unit load distribution correction coefficient AiFrequency modulated control signal fiAnd DEH Total valve position command UiAnd calculating to obtain a control instruction U of the steam turbine valveoutiThe load of the unit is controlled to increase and decrease, so that the power generation load and the power utilization load are balanced. The invention has the beneficial effects that: and adjusting the output load of each unit set according to the power generation capacity condition of each unit set in the power grid and the grid frequency fluctuation signal, so that each unit set in each power station synchronously bears load change or frequency change, the balance between the power generation load and the service load is maintained, and the isolated grid frequency is stable.
Description
Technical Field
The invention relates to a steam turbine load distribution control method and a steam turbine load distribution control system, in particular to a relatively independently operated power station (including a power station operated by an isolated network) consisting of a plurality of steam turbine generator units.
Background
The relatively independent power station, especially the self-contained power station of the large-scale industrial enterprise, usually has many turbo generator units to make up, the electric energy that these units produce is mainly carried the equipment production power consumption of self enterprise, some enterprises require the self-contained power station to maintain the station balance of power consumption, neither transmit power to the external electric network (such as the national electric network), also get electricity from the external electric network (such as the national electric network), because if get electricity from the external electric network then the enterprise also pays the industrial electric charge with higher costs, if transmit power to the external electric network, not only can not receive the electric charge, still receive the restriction and management and control of the administrative department of the electric network. Because the station load fluctuation of a general production unit is large, the generated energy of each steam turbine generator unit in the power station must be adjusted all the time, the generated load of each steam turbine generator unit in the power station is manually judged and set at present, and the deviation of the balance between the generated load and the power load is large.
For a power station operated by an isolated network, if the power generation load and the power load cannot be balanced, the frequency of the power network fluctuates, and the larger the unbalanced deviation of the load is, the larger the frequency fluctuation is, and even the power network collapses. At present, a steam turbine DEH control system is generally provided with a primary frequency modulation function, namely, the power generation load output of a unit is adjusted according to the frequency deviation of the power grid frequency and a set value (3000rpm) and the unit unequal rate parameters, and the power generation load output is balanced with the power consumption load, so that the power grid frequency is maintained to be stable. Because the frequency modulation capacities of the steam turbine generator units in the isolated operation power grid are different, a 'load robbing' phenomenon sometimes occurs, namely some units run in an overload mode or in a low-load mode, and some units run in a normal operation range, so that the frequency modulation capacity and the power generation efficiency of the power station units are reduced.
Therefore, the invention provides a load distribution control method for a steam turbine, which adjusts the output load of each unit set according to the power generation capacity condition of each unit set in a network and a network frequency fluctuation signal, so that each unit set in each power station synchronously bears load change or frequency change, thereby maintaining the balance of power generation load and service load and the stability of isolated network frequency.
Disclosure of Invention
Aiming at the defects of the scheme, the invention provides a load distribution control method and a load distribution control system for a steam turbine generator unit in a relatively independent operation power station.
The technical scheme of the invention is as follows: a steam turbine load distribution control method is applied to a power station with an isolated network operation mode or a parallel external network operation mode and composed of a plurality of steam turbine generator units, and comprises the following steps:
(1) calculating and outputting a performance control command Delta S according to the frequency deviation signal Delta F and the power deviation signal Delta P of the whole power stationout；
(2) Calculating the load closeness d of each unitiAccording to load proximity diCalculating load nearness mean davg(ii) a According to load proximity diLoad proximity mean value davgActual power signal PiAnd a maximum power signal PmaxCalculating to obtain a unit load distribution correction coefficient Ai；
(3) Controlling the command Δ S according to the output performanceoutThe unit load distribution correction coefficient AiFrequency modulated control signal fiAnd DEH Total valve position command UiAnd calculating to obtain a control instruction U of the steam turbine valveoutiControlling the unit to increase and decrease the load so as to balance the power generation load and the power utilization load;
the computing load proximity diThe method comprises the following steps: actual power signal P of receiver setiAnd a maximum power signal PmaxCalculating load closeness di：
di＝(1-Pi/Pmax)；
The unit load distribution correction coefficient AiThe calculation formula of (2) is as follows:
preferably, in the isolated network operation mode, the output performance control command Δ S is calculated according to the frequency deviation signal Δ Fout(ii) a Under the parallel external network operation mode, calculating an output performance control instruction delta S according to the power deviation signal delta Pout。
Preferably, the steam turbine valve control command UoutiThe calculation formula of (2) is as follows: u shapeouti=∑(βi·Ai·ΔSout+Ui+ki·Ai·fi) Wherein, βi、kiIs a constant number, UiIs the DEH master valve position command.
The invention also provides a steam turbine load distribution control system, comprising: the system comprises a main load distribution controller and a plurality of unit load distribution controllers, wherein the main load distribution controller comprises a main performance control module and a main load balancing module, and the unit load distribution controllers comprise unit load balancing modules and unit frequency modulation control modules; the main performance control module monitors the frequency deviation signal delta F and the power deviation signal delta P and calculates output performance controlSystem command Δ SoutDistributing a controller to the unit load of each unit; the unit load balancing module and the main load balancing module calculate load proximity diAnd proximity to average load davgObtaining a unit load distribution correction coefficient Ai(ii) a The unit frequency modulation control module calculates a frequency modulation control signal fi(ii) a The unit load distribution controller calculates to obtain a steam turbine valve control instruction UoutiControlling the steam turbine generator unit to increase and decrease the load so as to balance the power generation load and the power utilization load;
the computing load proximity diThe method comprises the following steps: actual power signal P of receiver setiAnd a maximum power signal PmaxCalculating load closeness di：
di＝(1-Pi/Pmax)；
The unit load distribution correction coefficient AiThe calculation formula of (2) is as follows:
the invention has the beneficial effects that: and adjusting the output load of each unit set according to the power generation capacity condition of each unit set in the power grid and the grid frequency fluctuation signal, so that each unit set in each power station synchronously bears load change or frequency change, the balance between the power generation load and the service load is maintained, and the isolated grid frequency is stable.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a block diagram of a power plant control architecture comprising multiple turbo-generator units according to an embodiment of the present invention;
FIG. 2 is a block diagram of a model for load distribution control calculation of a steam turbine of a power station according to an embodiment of the present invention;
fig. 3 is a schematic overall flow chart of an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Fig. 1 shows a block diagram of a power station control structure composed of multiple steam turbine generator units, wherein two steam turbine generator units are taken as an example, steam turbines 101 and 201 respectively drive generators 102 and 202 to generate power, and after passing through excitation regulators 105 and 205 and excitation transformers 107 and 207, the power is divided into two paths, one path passes through high-voltage power transformers 106 and 206 to supply power to power station auxiliary machinery, the other path passes through main transformers 108 and 208 and main oil switches 110 and 210 to be connected to an enterprise power grid 905, and standby transformers 109 and 209 are used as starting and standby transformers. For non-standalone operation of the enterprise power plant, it is also connected to an external power grid 906 (typically the national grid) to send excess power to the enterprise or to draw power from the external grid. The enterprise power station which operates in an isolated mode forms a small power grid to operate, and balance of power generation and power utilization loads of enterprises is achieved.
The load distribution control system shown in fig. 2 is composed of a main load distribution controller and unit load distribution controllers of each unit.
A primary load distribution controller: the system consists of a main performance control module 902 and a main load balancing module 903, wherein the main performance control module 902 monitors a frequency deviation signal delta F and a power deviation signal delta P, and calculates an output value delta SoutAnd the unit load distribution controller is sent to each unit for operation.
When the power generation amount of the power station is larger than the power consumption of the enterprise, the power deviation value delta P is smaller than 0 when the power generation amount of the power station is to be transmitted to an external power grid, and the main performance control module 902 calculates and outputs delta SoutAnd if the value is less than 0, each unit set is required to reduce the load, otherwise, when the power generation amount of the power station is less than the power consumption of the enterprise, each unit set is required to increase the load, and the load supply and demand balance of the power station of the enterprise is maintained.
In an isolated operation power station, when the grid frequency is greater than a set frequency (3000rpm), i.e., the frequency deviation Δ F is less than 0, the main performance control module 902 calculates the output Δ SoutAnd if the value is less than 0, each unit set is required to reduce the output, otherwise, when the frequency of the power grid is less than the set frequency (3000rpm), each unit set is required to increase the output so as to maintain the load supply and demand balance of the enterprise power station and ensure the stability of the isolated network operation frequency.
The main load balancing module 903 receives the load proximity signal d output by the load balancing control module of each unit setiCalculating the mean load closeness davgAnd the load balance calculation is used as the basis for the load balance calculation of each unit set.
A unit load distribution controller: the system mainly comprises a unit load balancing module and a unit frequency modulation control module of each unit. The unit FM control module 112 calculates the FM control signal fiAnd the unit set participates in isolated network operation frequency modulation control, so that the isolated network frequency is stable. Unit load balancing module 111 receives unit actual power signal PiAnd a maximum power signal PmaxCalculating load closeness di。
The main load distribution controller 901 calculates the load nearness average value davg, and the unit load balancing module 111 calculates the unit load distribution correction coefficient Ai. Load distribution correction factor AiPerformance control command Δ S for correcting individual unitsoutAnd a frequency-modulated control signal fi。
When the performance control command Δ SoutAnd a frequency-modulated control signal fiRequiring unit loading, i.e. Δ Sout>0 or fi>At 0, if the unit load proximity diGreater than mean load proximity davgAnd then, the unit set has a relatively large load increasing space, and the unit load distribution correction coefficient output is greater than 1, so that the relative load output of the unit set is increased. Otherwise, when the load proximity d of the unit groupiProximity to less than average load davgAnd then, the load increasing space of the unit set is relatively small, and the output of the unit load distribution correction coefficient is less than 1, so that the relative load output of the unit set is reduced.
When the performance control command Δ SoutAnd a frequency-modulated control signal fiRequiring load shedding of the unit, i.e. Δ Sout<0 or fi<At 0, if the unit load proximity diProximity to less than average load davgThen, the space for reducing the load of the unit set is relatively large, and the unit load distribution correction coefficient is outputGreater than 1 to enhance the relative unloading speed of the unit. Otherwise, when the load proximity d of the unit groupiGreater than mean load proximity davgAnd then, the load reduction space of the unit set is relatively small, and the output of the unit load distribution correction coefficient is less than 1, so that the relative load reduction speed of the unit set is reduced.
Finally calculating steam turbine valve control instruction U by unit load distribution controlleroutiThe output control turbine regulating valve 103 realizes the control of the load (frequency) of the turbine, and each unit set leads the load nearness of each unit set to be approximately the same through the adjustment of the unit load distribution correction coefficient, thereby achieving the purpose of synchronously distributing the load of each unit set of the power station and enhancing the frequency modulation capability of the unit set of the power station.
The embodiment also relates to a steam turbine load distribution control method, which is applied to a power station with an isolated network operation mode or a parallel external network operation mode consisting of a plurality of steam turbine generator units. With reference to fig. 3, the method comprises the following steps:
(1) calculating and outputting a performance control command Delta S according to the frequency deviation signal Delta F and the power deviation signal Delta P of the whole power stationout；
Under the isolated network operation mode, calculating and outputting a performance control instruction delta S according to the frequency deviation signal delta Fout(ii) a Under the parallel external network operation mode, calculating an output performance control instruction delta S according to the power deviation signal delta Pout。
(2) Calculating the load closeness d of each unitiAccording to load proximity diCalculating load nearness mean davg(ii) a According to load proximity diLoad proximity mean value davgActual power signal PiAnd a maximum power signal PmaxCalculating to obtain a unit load distribution correction coefficient Ai；
Actual power signal P of receiver setiAnd a maximum power signal PmaxCalculating load closeness di：
di＝(1-Pi/Pmax)；
Cell load distribution correction factorAiThe calculation formula of (2) is as follows:
(3) controlling the command Δ S according to the output performanceoutThe unit load distribution correction coefficient AiFrequency modulated control signal fiAnd DEH Total valve position command UiAnd calculating to obtain a control instruction U of the steam turbine valveoutiThe load of the unit is controlled to increase and decrease, so that the power generation load and the power utilization load are balanced.
Steam turbine valve control instruction UoutiThe calculation formula of (2) is as follows: u shapeouti＝∑(βi·Ai·ΔSout+Ui+ki·Ai·fi) Wherein, βi、kiIs a constant number, UiIs the DEH master valve position command.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (4)
1. A steam turbine load distribution control method is applied to a power station with an isolated network operation mode or a parallel external network operation mode formed by a plurality of steam turbine generator units, and is characterized by comprising the following steps:
(1) calculating and outputting a performance control command Delta S according to the frequency deviation signal Delta F and the power deviation signal Delta P of the whole power stationout；
(2) Calculating the load closeness d of each unitiAccording to load proximity diCalculating load nearness mean davg(ii) a According to load proximity diLoad proximity mean value davgActual power signal PiAnd a maximum power signal PmaxCalculating to obtain a unit load distribution correction coefficient Ai；
(3) Controlling the command Δ S according to the output performanceoutThe unit load distribution correction coefficient AiFrequency modulated control signal fiAnd DEH Total valve position command UiAnd calculating to obtain a control instruction U of the steam turbine valveoutiControlling the unit to increase and decrease the load so as to balance the power generation load and the power utilization load;
the computing load proximity diThe method comprises the following steps: actual power signal P of receiver setiAnd a maximum power signal PmaxCalculating load closeness di：
di＝(1-Pi/Pmax)；
The unit load distribution correction coefficient AiThe calculation formula of (2) is as follows:
2. the steam turbine load distribution control method according to claim 1, wherein in the isolated grid operation mode, the output performance control command Δ S is calculated from the frequency deviation signal Δ Fout(ii) a Under the parallel external network operation mode, calculating an output performance control instruction delta S according to the power deviation signal delta Pout。
3. The steam turbine load distribution control method of claim 1, wherein the steam turbine valve control command UoutiThe calculation formula of (2) is as follows: u shapeouti=∑(βi·Ai·ΔSout+Ui+ki·Ai·fi) Wherein, βi、kiIs a constant number, UiIs the DEH master valve position command.
4. A steam turbine load sharing control system, comprising: the system comprises a main load distribution controller and a plurality of unit load distribution controllers, wherein the main load distribution controller comprises a main performance control module and a main load balancing module, and the unit loadsThe load distribution controller comprises a unit load balancing module and a unit frequency modulation control module; the main performance control module monitors the frequency deviation signal delta F and the power deviation signal delta P and calculates and outputs a performance control command delta SoutDistributing a controller to the unit load of each unit; the unit load balancing module and the main load balancing module calculate load proximity diAnd proximity to average load davgObtaining a unit load distribution correction coefficient Ai(ii) a The unit frequency modulation control module calculates a frequency modulation control signal fi(ii) a The unit load distribution controller calculates to obtain a steam turbine valve control instruction UoutiControlling the steam turbine generator unit to increase and decrease the load so as to balance the power generation load and the power utilization load;
the computing load proximity diThe method comprises the following steps: actual power signal P of receiver setiAnd a maximum power signal PmaxCalculating load closeness di：
di＝(1-Pi/Pmax)；
The unit load distribution correction coefficient AiThe calculation formula of (2) is as follows:
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| CN108649618B (en) * | 2018-04-04 | 2019-03-12 | 广西大学 | A kind of exciter control system of the Turbo-generator Set suitable for power plant for self-supply |
| CN108708872B (en) * | 2018-04-26 | 2019-10-11 | 西安交通大学 | A control method and control system for parallel running turbine compressors |
| CN109146269A (en) * | 2018-08-07 | 2019-01-04 | 中国华电科工集团有限公司 | The accurate distribution method of unit load when a kind of Isolated Network System line fault |
| CN109782584B (en) * | 2019-01-21 | 2022-05-17 | 杭州澎康自动化科技有限公司 | Self-tuning control method for back-extraction steam turbine |
| CN112803438A (en) * | 2021-02-25 | 2021-05-14 | 中国五环工程有限公司 | Frequency control system and method for multiple generators in isolated network operation power plant |
| CN114922701B (en) * | 2022-05-25 | 2023-09-05 | 哈尔滨汽轮机厂有限责任公司 | Pressure and power control system of three-furnace two-machine main pipe biomass power plant steam turbine |
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