CN103545817A - Automatic power generation control method for cascade hydropower stations - Google Patents
Automatic power generation control method for cascade hydropower stations Download PDFInfo
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- CN103545817A CN103545817A CN201310438530.XA CN201310438530A CN103545817A CN 103545817 A CN103545817 A CN 103545817A CN 201310438530 A CN201310438530 A CN 201310438530A CN 103545817 A CN103545817 A CN 103545817A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses an automatic power generation control method for cascade hydropower stations. The automatic power generation control method is characterized in that each cascade power station is controlled according to a given cascade output operating mode in dispatching and limiting cascade output. The automatic power generation control method includes steps of firstly, calculating the maximum output Nmaxk of an ith-stage power station, determining load distribution among the power stations, sequentially comparing a given dispatch output N with the maximum output of each of power stations at each stage from the upstream and the downstream and the value of Nmaxk, stopping judgment when the N is smaller than or equal to the Nmaxk, and determining load-distribution power stations as the power stations from the first to the kth stage; finally, calculating distribution output of the power stations according to the flow balance principle. Output requirements are met by operation of the least power stations, operating cost of the cascade power stations is reduced, and the upstream power stations are given preference to load distribution; load is distributed for the power stations at various stages in inverse proportion according to water consumption rate of the power stations, and after-distribution values are subjected to rationality verification; automation degree of high-cascade small serial hydropower stations can be improved, power generation benefits are increased, safety operation level of the power stations is improved, and labor intensity of operators is lowered.
Description
Technical field
The invention belongs to Automation of Hydropower Station control field, be specifically related to a kind of cascaded hydropower stations automatic power generation control method.
Background technology
China's hydropower resources are abundant, the reserves of the non-renewable resources such as coal, oil are limited, simultaneously because thermoelectricity has destruction to a certain degree for environment, water power is as a kind of reproducible clean resource, along with further developing of industry, demand to electric power is growing on and on, so hydroelectric power generation can adapt to modern society's present situation huge to electric power energy demand better, possesses good development potentiality.
There is complicated waterpower, electric power contact in cascaded hydropower stations, possesses certain compensated regulation ability, and then cause the operational mode in each power station of step various between upstream and downstream, and the combined optimization scheduling problem of step hydropower station is complicated.Realize the combined dispatching of station group for safe, stable, the high-quality operation important role of electrical network, imbalance between supply and demand that can fine alleviation electrical network, solves load peak-valley difference problem, improves the ability of peak load regulation network frequency modulation, reduce the emergency reserve capacity of unit, improve power benefit.
Step series connection small hydropower station is the small hydropower station group who is together in series by modes such as open channel, pipelines, and only there is storage capacity in these power stations in chopped-off head power station, but storage capacity adjustable extent is also less; Lower station is provided with forebay, and for current buffering but without regulating power, so the hydraulic connection of this class step hydropower station is tight, and the changes in flow rate in power station, upstream directly has influence on the operation of lower station; This class power station is without similar by-pass valve equipment simultaneously, and after power station accident or maintenance outage, current cannot flow to downstream and may cause lower station to be shut down.
At present, Large Watershed step hydropower station has all been set up step economic dispatch system and is carried out unified management, coordinates the operation in each power station of step, and main or by artificial judgment during the operation of step series connection small plant, regulates, controls effect main relevant with operations staff's experience; For some sudden accidents, human intervention often lags behind, and capability in handling accident is limited, can not, in trouble-saving expansion of the very first time, therefore easily reduce the year hours of operation in hydroelectric station.
Summary of the invention
The object of this invention is to provide a kind of cascaded hydropower stations automatic power generation control method, with solve the caused control weak effect of Artificial Control mode and running time short problem.
In order to realize above object, the technical solution adopted in the present invention is: a kind of cascaded hydropower stations automatic power generation control method, when scheduling restriction step is exerted oneself, each power station of step is controlled according to the given step operational mode of exerting oneself, and its control procedure comprises the steps:
(1) calculate i level power station maximum output Nimax:Nimax=Q
i/ q
i, q
iit is the rate of water consumption in i level power station; Q
iit is i level power station flow;
(2) determine the sharing of load between power station: relatively dispatch successively the given N of exerting oneself and be from upstream to the power stations at different levels maximum output in downstream and the value of Nmaxk,
when N≤Nmaxk, stop judgement, determine that sharing of load power station is 1st～k level power station, k+1 level and power station afterwards thereof are out of service;
(3) distribution of calculating each power station according to the flow equilibrium principle N that exerts oneself
i.
The distribution in the i level power station N that exerts oneself in described step (3)
icomputing formula as follows:
1≤i≤k; q
iit is the rate of water consumption in i level power station; q
kit is the rate of water consumption in k level power station.
The distribution that calculates each power station N that exerts oneself
iafter, also need to distribute the check of exerting oneself: compare successively N
iwith Nimax, work as N
iduring >Nimax, the output of power station of i level is assigned as to Nimax, by Ni-Nimax sharing of load to k+1 level power station; Meanwhile, each power station is with N
ifor the desired value internal loading of standing distributes.
When scheduling is during to the zero load restriction in each power station, each power station is controlled according to maximum generating watt operational mode, take to make full use of currently to come the water yield to realize maximum generating watt as target.
The internal loading of standing distributes and distributes by Principle of Average Allocation: N
kgen=N
i/ n, N
igenthe k unit commitment that is i level power station is exerted oneself; N
ibe that the distribution of i level power station is exerted oneself; N is the unit number of units in i level power station.
While controlling according to maximum generating watt operational mode in each power station, when overflow appears in forebay, the unit that power station can be increased to load increases load until without overflow according to setting means; When the water level of the frontal pool is too low, the wherein unit in generating state in power station is reduced to load until water level reaches safe operation water level according to setting means; When water level is when shutting down water level, by all compressor emergency shutdowns in this power station.
According to setting means, increase load or reduce load for increase or reduce load according to fixed step size.
Operational mode is exerted oneself while controlling according to given step in each power station of step, if there is accident and shut down in the unit that is in generating state of primary power station wherein, increase immediately in this grade of power station all the other unit loads in generating state with balanced load difference, and the operational mode in the power station in this accident downstream of hydro-power plant is converted to by flow and is automatically moved, when flow recovers to switch to after normal the given step operational mode of exerting oneself; If regulate the generating state unit load still cannot balanced load difference, open and shut down unit with balanced load.
Operational mode is exerted oneself while controlling according to given step in each power station of step, if be less than while regulating limit value to constant load and current step total load difference, choosing one of them power station regulates: when difference is that timing increases Load Regulation, the preferential power station of forebay overflow of selecting regulates, next selects chopped-off head power station to regulate, if can timing without power station, send alarm signal; When difference, carry out load shedding adjusting when negative, preferentially select final stage power station to carry out load shedding adjusting, as needed, shut down, preferentially stop the unit in final stage power station.
When cascaded hydropower stations automatic power generation control method of the present invention is exerted oneself at scheduling restriction step, each power station of step is controlled according to the given step operational mode of exerting oneself, with minimum power station operation, meet the requirement of exerting oneself, reduce step hydropower station operating cost, preferentially select the power station in upstream to carry out sharing of load; According to power station rate of water consumption inverse proportion, distribute power stations at different levels load, the value after distribution is carried out reasonability verification; The automaticity that can improve step series connection small power station, has improved power benefit, has improved the safety operation level in power station simultaneously, has reduced operations staff's working strength.
When dispatching the zero load restriction in each power station, each power station is controlled according to maximum generating watt operational mode, makes full use of existing hydropower resources, improves generating efficiency, and the energy output in power station is maximized.
While controlling according to maximum generating watt operational mode in each power station, utilize rational water level control mode to consider the too low potential safety hazard of bringing of water level, can increase security of operation nargin by controlling lowest water level again.
Adopt security control mode to control each power station; the situation that occurs accident in reply step hydropower station; during accident, unit is shut down in the load of the normal unit in automatic adjusting accident power station or unlatching; regulate other adjustable unit of this power station to keep the continuation of current, avoid causing the situation of lower station flow rapid drawdown to occur because shutting down.
Little load adjustment control mode changes less situation for Load Regulation, has avoided multistation to participate in regulating and increase operating cost.
Accompanying drawing explanation
Fig. 1 is each power station of step of the present invention according to the exert oneself control method flow chart of operational mode of given step.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Cascaded hydropower stations automatic power generation control method of the present invention, be particularly useful for without the series connection small hydropower station that regulates storage capacity, when scheduling restriction step is exerted oneself, each power station of step is controlled according to the given step operational mode of exerting oneself, suppose that present flow rate lower step gross capability equals to dispatch the given N that exerts oneself, this operational mode is controlled and required is under present flow rate, to make step gross capability equal to dispatch the given N that exerts oneself, and its control procedure comprises the steps:
(1) calculate i level power station maximum output Nimax:Nimax=Q
i/ q
i, q
iit is the rate of water consumption in i level power station; Q
iit is i level power station flow;
(2) determine the sharing of load between power station: relatively dispatch successively the given N of exerting oneself and be from upstream to the power stations at different levels maximum output in downstream and the value of Nmaxk,
when N≤Nmaxk, stop judgement, determine that sharing of load power station is 1st～k level power station, k+1 level and power station afterwards thereof are out of service;
(3) distribution of calculating each power station according to the flow equilibrium principle N that exerts oneself
i.
When calculating i level power station maximum output Nimax, the computational process of the present embodiment is as follows: first according to head---and rate of water consumption curve interpolation calculates the rate of water consumption q in i level power station under current head
i; Again according to the i level power station flow Q obtaining
i, according to following formula, calculate i level power station maximum output Nimax:Nimax=Q
i/ q
i.
The exert oneself formula of Ni of the distribution of calculating i level power station is as follows:
1≤i≤k, q
iit is the rate of water consumption in i level power station; q
kit is the rate of water consumption in k level power station.
In the present embodiment at the distribution that calculates each power station N that exerts oneself
iafter, also comprise the steps:
1> distributes the check of exerting oneself: compare successively N
iwith Nimax, work as N
iduring >Nimax, the output of power station of i level is assigned as to Nimax, by Ni-Nimax sharing of load to k+1 level power station;
Each power station of 2> is with N
ifor the desired value internal loading of standing distributes.
When scheduling is during to the zero load restriction in each power station, each power station is controlled according to maximum generating watt operational mode, take to make full use of currently to come the water yield to realize maximum generating watt as target, and its control procedure comprises the steps:
(1) according to head---the rate of water consumption q in power station under the current head of rate of water consumption curve (H-q) interpolation calculation
i;
(2) according to the i level power station flow Q obtaining
i, calculate i level power station maximum output Nimax:Nimax=Q
i/ q
i;
(3) take Nimax and distribute as the desired value internal loading of standing in each power station.
The internal loading of standing in the present embodiment distribute by etc. micro-gaining rate principle distribute, because power station unit model is identical, sharing of load can be reduced to by Principle of Average Allocation and distribute: N
kgen=N
i/ n, in formula, N
igenthe k unit commitment that is i level power station is exerted oneself; N
ibe that the distribution of i level power station is exerted oneself; N is the unit number of units in i level power station.
While controlling according to maximum generating watt operational mode in each power station, utilize rational water level control mode to control each power station, avoided the too low situation of forebay overflow or the water level of the frontal pool to occur, its control principle is as follows:
(1), when overflow appears in forebay, the unit that power station can be increased to load increases load until without overflow, avoid occurring abandoning water according to setting means;
(2) when the water level of the frontal pool is too low, the wherein unit in generating state in power station is reduced to load until water level reaches safe operation water level according to setting means, when load shedding after a period of time water level still decline and shut down, prevent that cutout situation from occurring; When water level is when shutting down water level, by all compressor emergency shutdowns in this power station.
Increasing load or reduce load according to setting means of the present embodiment is to increase or reduce load according to fixed step size.
The present embodiment security control mode is controlled each power station, during accident, unit is shut down in the load of the normal unit in automatic adjusting accident power station or unlatching, keep as much as possible flow equilibrium, the impact of reduction accident on lower station, its control principle is as follows: operational mode is exerted oneself while controlling according to given step in each power station of step, if there is accident and shut down in the unit that is in generating state of primary power station wherein, increase immediately in this grade of power station all the other unit loads in generating state with balanced load difference, and the operational mode in the power station in this accident downstream of hydro-power plant is converted to by flow and is automatically moved, when flow recovers to switch to after normal the given step operational mode of exerting oneself, if regulate the generating state unit load still cannot balanced load difference, open and shut down unit with balanced load.
The little load adjustment control mode of the present embodiment is as follows: operational mode is exerted oneself while controlling according to given step in each power station of step, if be less than while regulating limit value to constant load and current step total load difference, choosing one of them power station regulates, to avoid little load variations to cause a plurality of stations to participate in regulating, specifically there are following two kinds of situations:
(1) when difference is that timing increases Load Regulation, preferentially select the power station of forebay overflow to regulate, next selects chopped-off head power station to regulate, if can timing without power station, sends alarm signal;
(2) when difference, carry out load shedding adjusting when negative, preferentially select final stage power station to carry out load shedding adjusting, as needed, shut down, preferentially stop the unit in final stage power station.
Claims (9)
1. a cascaded hydropower stations automatic power generation control method, is characterized in that, when scheduling restriction step is exerted oneself, each power station of step is controlled according to the given step operational mode of exerting oneself, and its control procedure comprises the steps:
(1) calculate i level power station maximum output Nimax:Nimax=Q
i/ q
i, q
iit is the rate of water consumption in i level power station; Q
iit is i level power station flow;
(2) determine the sharing of load between power station: relatively dispatch successively the given N of exerting oneself and be from upstream to the power stations at different levels maximum output in downstream and the value of Nmaxk,
when N≤Nmaxk, stop judgement, determine that sharing of load power station is 1st～k level power station, k+1 level and power station afterwards thereof are out of service;
(3) distribution of calculating each power station according to the flow equilibrium principle N that exerts oneself
i.
2. cascaded hydropower stations automatic power generation control method according to claim 1, is characterized in that: in described step (3), the exert oneself computing formula of Ni of the distribution in i level power station is as follows:
1≤i≤k; q
iit is the rate of water consumption in i level power station; q
kit is the rate of water consumption in k level power station.
3. cascaded hydropower stations automatic power generation control method according to claim 1, is characterized in that: the distribution that calculates each power station N that exerts oneself
iafter, also need to distribute the check of exerting oneself: compare successively N
iwith Nimax, work as N
iduring >Nimax, the output of power station of i level is assigned as to Nimax, by Ni-Nimax sharing of load to k+1 level power station; Meanwhile, each power station is with N
ifor the desired value internal loading of standing distributes.
4. cascaded hydropower stations automatic power generation control method according to claim 1, it is characterized in that: when dispatching the zero load restriction in each power station, each power station is controlled according to maximum generating watt operational mode, take to make full use of currently to come the water yield to realize maximum generating watt as target.
5. cascaded hydropower stations automatic power generation control method according to claim 3, is characterized in that: the internal loading of standing distributes and distributes by Principle of Average Allocation: N
kgen=N
i/ n, N
igenthe k unit commitment that is i level power station is exerted oneself; N
ibe that the distribution of i level power station is exerted oneself; N is the unit number of units in i level power station.
6. cascaded hydropower stations automatic power generation control method according to claim 4, it is characterized in that: while controlling according to maximum generating watt operational mode in each power station, when overflow appears in forebay, the unit that power station can be increased to load increases load until without overflow according to setting means; When the water level of the frontal pool is too low, the wherein unit in generating state in power station is reduced to load until water level reaches safe operation water level according to setting means; When water level is when shutting down water level, by all compressor emergency shutdowns in this power station.
7. cascaded hydropower stations automatic power generation control method according to claim 6, is characterized in that: according to setting means, increase load or reduce load for increase or reduce load according to fixed step size.
8. cascaded hydropower stations automatic power generation control method according to claim 1, it is characterized in that: operational mode is exerted oneself while controlling according to given step in each power station of step, if there is accident and shut down in the unit that is in generating state of primary power station wherein, increase immediately in this grade of power station all the other unit loads in generating state with balanced load difference, and the operational mode in the power station in this accident downstream of hydro-power plant is converted to by flow and is automatically moved, when flow recovers to switch to after normal the given step operational mode of exerting oneself; If regulate the generating state unit load still cannot balanced load difference, open and shut down unit with balanced load.
9. cascaded hydropower stations automatic power generation control method according to claim 1, it is characterized in that: operational mode is exerted oneself while controlling according to given step in each power station of step, if be less than while regulating limit value to constant load and current step total load difference, choosing one of them power station regulates: when difference is that timing increases Load Regulation, the preferential power station of forebay overflow of selecting regulates, next selects chopped-off head power station to regulate, if can timing without power station, sends alarm signal; When difference, carry out load shedding adjusting when negative, preferentially select final stage power station to carry out load shedding adjusting, as needed, shut down, preferentially stop the unit in final stage power station.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104701888A (en) * | 2015-02-28 | 2015-06-10 | 华中电网有限公司 | Real-time load regulating method for power grid using hydro-thermal power working condition self-matching mode |
| CN105914795A (en) * | 2016-05-19 | 2016-08-31 | 华能澜沧江水电股份有限公司 | Hydropower station automatic generation active output control method |
| CN108252276A (en) * | 2018-02-09 | 2018-07-06 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method based on adjusting of contributing |
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| CN102820656A (en) * | 2012-08-25 | 2012-12-12 | 华北电力大学（保定） | Method for jointly scheduling power generation load by using wind power generation unit and thermal power generation unit |
| CN103066604A (en) * | 2012-11-20 | 2013-04-24 | 贵州乌江水电开发有限责任公司 | Stair automatic generation control method under factory network coordination mode |
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2013
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| US20050172630A1 (en) * | 2002-07-04 | 2005-08-11 | Rolf Althaus | Method for operation of a power generation plant |
| CN102820656A (en) * | 2012-08-25 | 2012-12-12 | 华北电力大学（保定） | Method for jointly scheduling power generation load by using wind power generation unit and thermal power generation unit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104701888A (en) * | 2015-02-28 | 2015-06-10 | 华中电网有限公司 | Real-time load regulating method for power grid using hydro-thermal power working condition self-matching mode |
| CN104701888B (en) * | 2015-02-28 | 2017-07-07 | 华中电网有限公司 | A kind of method of power network water, thermoelectricity operating mode Self Matching mode adjustment Real-time Load |
| CN105914795A (en) * | 2016-05-19 | 2016-08-31 | 华能澜沧江水电股份有限公司 | Hydropower station automatic generation active output control method |
| CN105914795B (en) * | 2016-05-19 | 2018-03-30 | 华能澜沧江水电股份有限公司 | A kind of power station automatic generation active power output control method |
| CN108252276A (en) * | 2018-02-09 | 2018-07-06 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method based on adjusting of contributing |
| CN108252276B (en) * | 2018-02-09 | 2019-10-29 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method adjusted based on power output |
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