CN103793855A - Construction method for real-time electricity supply and demand equilibrium index of regional grid - Google Patents
Construction method for real-time electricity supply and demand equilibrium index of regional grid Download PDFInfo
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Abstract
The invention relates to a construction method for a real-time electricity supply and demand equilibrium index of a regional grid. The construction method is characterized by including the following steps that parameters are preset in an electricity supply and demand equilibrium index construction software module; data are obtained from an SCADA system, and the electricity generation total power, the regional grid electricity generation hot spare total power, the regional grid load total power, the regional grid power rationing total power, the feed total power, the discharge total power, the electricity generation adjusting effect power and the load adjusting effect power at a certain moment of the regional grid are calculated; the regional grid electricity supply and demand equilibrium index RPBL t at the moment is calculated. The construction method is reasonable in design, capable of authentically reflecting the electric energy supply and demand state of the regional grid and transmitting the state to the electricity market trading center, the market supervision department, all electric energy producers, electric energy consumers, a related remote control terminal and the like for social information demanders to use, and therefore a foundation is laid for the real-time electricity price theory and technology, and development of the intelligent grid and the electricity market is promoted.
Description
Technical field
The invention belongs to electrical engineering technical field, especially a kind of construction method of regional power grid real-time electric power equilibrium of supply and demand index.
Background technology
Generating, transmission of electricity and the electricity consumption of electric system are simultaneous, maintain the normal operation of the equilibrium of supply and demand guarantee electric system of its electric energy the moment.Electric power supply deficiency or electric power supply surplus all can be cut down social benefit and the economic benefit of electric system.Electric energy be public product be also commodity, the height of electricity price except reflect himself be worth, also in close relations relevant to the supply and demand of electric energy.Because electrical energy production person and electric energy consumption user's production and consumer behavior are subject to electricity price impact just invariably, therefore, set up and carry out the Spot Price system that can reflect power supply and demand relation, person and consumer participate in the enthusiasm of electricity market could to transfer electric power supply to greatest extent, and promote the peak load shifting of electric system and dissolving of intermittent energy source (as wind-powered electricity generation, photovoltaic generation).
Along with the development of intelligent grid, foundation is the power supply and demand balance index system of reflecting regional electrical network electric energy state between supply and demand in real time, and set up tou power price or Combined Spot Price Model with other correlative factor according to this, form the Spot Price of reflection electrical network electric energy state between supply and demand, allow electrical energy production person and consumer's active response, initiatively participate in electricity market activity, be current problem in the urgent need to address.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of reasonable in design, access efficiency is high, the construction method of fireballing regional power grid real-time electric power equilibrium of supply and demand index.
The present invention solves existing technical matters and takes following technical scheme to realize:
A construction method for regional power grid real-time electric power equilibrium of supply and demand index, comprises the following steps:
Step 2, power supply and demand balance index construction software module are obtained the generating general power P in data a certain moment of zoning electrical network from SCADA system
t_ generating, regional power grid generating stand-by heat general power P
t_ is for subsequent use, regional power grid load general power P
t_ load, regional power grid power cuts to limit consumption general power P
t_ rations the power supply, send into general power P
t_ sends into, send general power P
t_ sends, the caused generating of regional power grid frequency departure regulates effect power P
the t_ adjusting of generating electricitywith the caused adjustment effect of load power P of regional power grid frequency departure
t_ Load Regulation;
Step 3, use the computation model of following real-time electric power equilibrium of supply and demand index to calculate the regional power grid power supply and demand balance index RPBL in this moment
t:
In above formula, δ is regional power grid minimum thermal nargin for subsequent use.
And the required parameter of described structure regional power grid power supply and demand balance index comprises: time interval Δ t, the frequency adjustment effect coefficient K of regional power grid equivalent generator group of regional power grid minimum thermal nargin δ for subsequent use, calculating real-time electric power equilibrium of supply and demand index
gfrequency adjustment effect coefficient K with load
lvalue.
And, the generating general power P in described a certain moment of regional power grid
t_ generatingcomputation model be:
Wherein, i=1,2 ..., n represents the number of all kinds of generating plant in regional power grid, P
i, t_ generatingthe generated output that represents t moment i generating plant, its numerical value obtains from the SCADA of regional power grid dispatching center system;
The generating stand-by heat general power P in described a certain moment of regional power grid
t_ is for subsequent usecomputation model be:
Wherein, i=1,2 ..., n represents to provide i generating plant of stand-by heat and sends into power interconnection point, P
i, t_ is for subsequent userepresenting t moment i generating plant or sending into interconnection point provides the numerical value of stand-by heat power, and this numerical value all obtains from SCADA system;
The load general power P in a certain moment of described regional power grid regional power grid
t_ loadcomputation model be:
Wherein, i=1,2 ..., n represents i load bus; P
i, t_ loadthe load power that represents t moment node i, its numerical value obtains from SCADA system;
The power cuts to limit consumption general power P in described a certain moment of regional power grid
t_ rations the power supplycomputation model be:
Wherein, i=1,2 ..., n represents i load bus; P
i, t_ rations the power supplythe power cuts to limit consumption power that represents t moment load bus i, its numerical value obtains from SCADA system;
The interconnection in described a certain moment of regional power grid is sent into general power general power P
t_ sends intocomputation model be:
Wherein, i=1,2 ..., n represents i interconnection point, P
i, t_ sends intothe general power of sending into that represents t moment contact point i, its numerical value obtains from SCADA system.
The interconnection in described a certain moment of regional power grid is sent into general power general power P
t_ sendsobtain by following calculated with mathematical model:
Wherein, i=1,2 ..., n represents i interconnection point, P
i, t_ sendsthe general power of sending that represents t moment contact point i, its numerical value obtains from SCADA system.
And the generating in described a certain moment of regional power grid regulates effect power P
the t_ adjusting of generating electricityto calculate by following mathematic(al) mode:
P
the t_ adjusting of generating electricity=-K
g× Δ f
t
In formula, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid, K
gfor the frequency adjustment effect coefficient of regional power grid equivalent generator group, this coefficient is placed in power supply and demand balance index construction software module in advance.
And, the adjustment effect of load power P in described a certain moment of regional power grid
t_ Load Regulationto obtain by following calculated with mathematical model:
P
t_ Load Regulation=K
lΔ f
t
In formula, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid, K
lfor the frequency adjustment effect coefficient of load, this coefficient is placed in power supply and demand balance index construction software module in advance.
And described minimum thermal nargin δ for subsequent use is placed in power supply and demand balance index construction software module in advance, this value span is 0.0～0.2.
Advantage of the present invention and good effect are:
1, the present invention utilizes the related data of the SCADA of regional power grid dispatching center system real-time data base, builds the power supply and demand balance index in this moment of regional power grid, the truly state between supply and demand of reflecting regional electrical network electric energy.In the electricity market under intelligent grid, the regional power grid real-time electric power equilibrium of supply and demand index calculating is delivered to power market transaction center, Electric Power Market Regulation department, each electrical energy production person, electric energy consumption person and relevant remote control terminal etc. by intelligent grid communication network, for social information's demander, and then for spot pricing theory and technology lay the foundation, promote the development of intelligent grid and electricity market.
2, the regional power grid real-time electric power equilibrium of supply and demand index that the present invention builds can be used as an important indicator of power network monitoring in SCADA system, the real-time curve of viewing area grid power equilibrium of supply and demand index in the SCADA of dispatching center system man-machine interface, history curve etc., curve capable of dynamic shows concrete time and the exponential quantity in random time section, can show maximal value, minimum value, the maximal value time, the minimum value time etc., for power supply and demand analysis, early warning provides the index quantizing, for management and running department reasonable arrangement unit operation mode provides with reference to information, improve the management level of electric system.
Accompanying drawing explanation
Fig. 1 is processing flow chart of the present invention;
Fig. 2 is regional power grid equivalence generated output-frequency static regulation characteristics figure;
Fig. 3 is regional power grid synthetic load static characteristic curve figure.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described.
A kind of construction method of regional power grid real-time electric power equilibrium of supply and demand index, it is the related data of utilizing the SCADA of regional power grid dispatching center system real-time data base, and by these related datas are carried out to pre-service, obtain the generating general power in a certain moment in regional power grid, generating stand-by heat general power is (containing thermal power plant's stand-by heat, hydroelectric power plant's stand-by heat, nuclear power stand-by heat, wind-powered electricity generation is abandoned wind general power, photovoltaic is abandoned light general power, energy-accumulating power station can issue additional power and interconnection is supported non-firm power etc.), load general power in regional power grid, power cuts to limit consumption general power, carry out the interconnection of Power Exchange sends general power and sends into general power with region external power grid, system frequency etc., the data substitution real-time electric power equilibrium of supply and demand exponential model of again these being processed calculates, can obtain the power supply and demand balance index in this moment of regional power grid.
Electrical network SCADA system is take computing machine as basic dispatch automated system, and it can realize to on-the-spot operational outfit the functions such as data acquisition, monitoring of tools and various types of signal warning.Data acquisition function is by being positioned at the master station computer system of dispatching of power netwoks control center and being positioned at the terminal RTU of distant place power plant, transformer station and relevant information transfer channel completes jointly.The present invention carries out the calculating of pre-service and real-time electric power equilibrium of supply and demand index to related data, all realize by the intrasystem power supply and demand balance index construction of master station computer software module.The time interval of the power supply and demand balance index in this moment and next moment power supply and demand balance index is artificially set in software module, and inserts in advance the minimum thermal nargin for subsequent use that guarantees that the normal operation of electrical network generally should leave.The real-time electric power equilibrium of supply and demand index in the each moment of regional power grid obtaining is delivered to power market transaction center, each electrical energy production person, electric energy consumption person and relevant RTU etc. by intelligent grid communication network, for social information's demander.In addition, regional power grid real-time electric power equilibrium of supply and demand index can be used as an important monitoring index in grid dispatching center SCADA system, for management and running department reasonable arrangement unit operation mode etc. provides with reference to information.
So that in SCADA system, real-time electric power equilibrium of supply and demand index system is as example, the present invention is described in detail below.The present invention utilizes the power supply and demand balance index construction software module in the master station computer system of dispatching of power netwoks control center to realize, and need to process according to the following steps, as shown in Figure 1;
Step 2, power supply and demand balance index construction software module are carrying out before real-time electric power equilibrium of supply and demand index calculates, utilize the related data interface of SCADA system real-time data base to obtain the relevant service data of required system, and related data is carried out to corresponding pre-service and calculating, obtain calculating the required various parameters of power supply and demand balance index.In order to explain and convenience of calculation, in the present embodiment, the unified megawatt (MW) that adopts of power unit represents.Particular content is as follows:
1. the generating general power in a certain moment of zoning electrical network
wherein i=1,2, n represents the number of all kinds of generating plant in regional power grid, generating plant comprises all kinds of power supplys such as thermal power plant's (containing cogeneration plant), wind energy turbine set, photovoltaic plant, hydroelectric power plant, nuclear power plant, and generating general power comprises the generated output of all kinds of power supplys such as thermal power plant's (containing cogeneration plant), wind energy turbine set, photovoltaic plant, power station, nuclear power station; P
i, t_ generatingthe generated output that represents t moment i generating plant, its numerical value obtains from the SCADA of regional power grid dispatching center system.
2. the generating stand-by heat general power in a certain moment of zoning electrical network
, wherein i=1,2 ..., n represents to provide i generating plant of stand-by heat and sends into power interconnection point; P
i, t_ is for subsequent userepresenting t moment i generating plant or sending into interconnection point provides the numerical value of stand-by heat power, and this numerical value all obtains from SCADA system.Generating stand-by heat general power comprises that thermal power plant's stand-by heat, hydroelectric power plant's stand-by heat, nuclear power station stand-by heat, wind-powered electricity generation abandon that wind power, photovoltaic are abandoned luminous power, energy-accumulating power station can be issued additional power etc.In addition, owing to having Power Exchange by interconnection between each regional power grid, regional power grid generating stand-by heat general power also comprises interconnection stand-by heat power, and the maximum support power that this part stand-by heat equals to send into deducts sends into power in real time.
3. the load general power in a certain moment of zoning Grid electrical network
, wherein P
t_ loadfor load general power, load general power comprises all loads such as all kinds of generating auxiliary powers and network loss; I=1,2 ..., n represents i load bus; P
i, t_ loadthe load power that represents t moment node i, its numerical value obtains from SCADA system.
4. the power cuts to limit consumption general power in a certain moment of zoning electrical network
, wherein, i=1,2 ..., n represents i load bus; P
i, t_ rations the power supplythe power cuts to limit consumption power that represents t moment load bus i, its numerical value obtains from SCADA system.
5. the interconnection that a certain moment of zoning electrical network and external power grid carry out Power Exchange is sent into general power
with send general power
, wherein i=1,2 ..., n represents i interconnection point, P
i, t_ sends intoand P
i, t_ sendswhat represent respectively t moment contact point i sends into, sends general power, and its numerical value all obtains from SCADA system.
6. the generating that caused by frequency departure of a certain moment of zoning electrical network regulates effect power P
the t_ adjusting of generating electricity=-K
g× Δ f
t, wherein, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid.
Because electric system exists power-static frequency characteristic problem of genset, in the time that regional power grid running frequency declines, under the effect of genset at its speed regulator, automatically increase the active power of sending, and running frequency while raising unit automatically reduce the active power that it sends.In electric system, conventionally to process according to regional power grid equivalence generated output-frequency Static adjust effect, regional power grid equivalence generated output-frequency static regulation characteristics is as shown in Figure 2.In figure, the frequency that f is regional power grid; P
gthe summation of the active power of sending for all units of system parallel running.Obtain regional power grid genset according to this power-static regulation characteristics and subtract the power of sending out or issuing additional with frequency lifting, be referred to as regional power grid because of the caused generating adjusting of frequency departure effect power P
the t_ adjusting of generating electricity.
The slope K of power-frequency static regulation characteristics
g=-
Δp
g/
Δf, is referred to as the frequency adjustment effect coefficient of regional power grid equivalent generator group, and negative sign represents in the time that running frequency declines the generated power increase of exerting oneself, and running frequency generated power minimizing of exerting oneself while raising.
T moment regional power grid because the caused generating of frequency departure regulates effect power is:
P
the t_ adjusting of generating electricity=-K
g× Δ f
t
Wherein, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid; K
gfor the frequency adjustment effect coefficient of regional power grid equivalent generator group, the K of different electrical networks
gvalue is different.K
gbe worth artificially given in software module.
7. the adjustment effect of load power P that caused by frequency departure of a certain moment of zoning electrical network
t_ Load Regulation=K
lΔ f
t, wherein, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid.
Because electric system exists the static frequency characteristic issues of load, the power that load consumes when regional power grid running frequency declines reduces, and the consumed power increase that running frequency is loaded while raising.Regional power grid synthetic load static characteristic curve near rated frequency close to straight line, as shown in Figure 3.In figure, the frequency that f is regional power grid; P
lfor system equivalent load power.According to the static frequency characteristic of regional power grid synthetic load, obtain recruitment or reduction because of the caused load consumed power of frequency departure, i.e. the caused adjustment effect of load power P of regional power grid frequency departure
t_ Load Regulation.
The slope of synthetic load static frequency characteristic is K
l=
Δp/
Δf, be referred to as load frequency adjustment effect coefficient, K
lnumerical value depend on the proportion of each type load in electric system, therefore different electrical network K
lvalue is different, and is a time dependent numerical value, in real system, and general K
l=1～3, it represents frequency change 1%, the active power respective change 1%～3% that load consumes.
The adjustment effect of load power that t moment regional power grid frequency departure causes is:
P
t_ Load Regulation=K
lΔ f
t
Wherein, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid.K
lartificially given in software module.
Step 3, the computation model of the data importing real-time electric power equilibrium of supply and demand index of processing is calculated, can obtain the power supply and demand balance index in this moment of regional power grid.
Because normally moving, electric system need to ensure certain stand-by heat capacity, the i.e. spinning reserve of system.Therefore, must leave certain minimum thermal nargin δ for subsequent use (general span is 0.0～0.2) according to relevant regulations.The computation model of real-time electric power equilibrium of supply and demand index is as follows:
If the regional power grid real-time electric power equilibrium of supply and demand index 100% calculating by this model, represents power supply and demand balance; If the equilibrium index calculating is greater than 100%, represent that electric power supply ability is greater than demand; If be less than 100%, represent that electric power supply ability is less than demand.
It is emphasized that; embodiment of the present invention is illustrative; rather than determinate; therefore the present invention includes and be not limited to the embodiment described in embodiment; every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (3)
1. a construction method for regional power grid real-time electric power equilibrium of supply and demand index, is characterized in that: comprise the following steps:
Step 1, in power supply and demand balance index construction software module the required parameter of preset structure regional power grid power supply and demand balance index;
Step 2, power supply and demand balance index construction software module are obtained the generating general power P in data a certain moment of zoning electrical network from SCADA system
t_ generating, regional power grid generating stand-by heat general power P
t_ is for subsequent use, regional power grid load general power P
t_ load, regional power grid power cuts to limit consumption general power P
t_ rations the power supply, send into general power P
t_ sends into, send general power P
t_ sends, the caused generating of regional power grid frequency departure regulates effect power P
the t_ adjusting of generating electricitywith the caused adjustment effect of load power P of regional power grid frequency departure
t_ Load Regulation;
Step 3, use the computation model of following real-time electric power equilibrium of supply and demand index to calculate the regional power grid power supply and demand balance index RPBL in this moment
t:
In above formula, δ is regional power grid minimum thermal nargin for subsequent use, and this value span is 0.0～0.2.
2. the construction method of regional power grid real-time electric power equilibrium of supply and demand index according to claim 1, is characterized in that: the required preset parameter of described structure regional power grid power supply and demand balance index comprises: time interval Δ t, the frequency adjustment effect coefficient K of regional power grid equivalent generator group of regional power grid minimum thermal nargin δ for subsequent use, calculating real-time electric power equilibrium of supply and demand index
gfrequency adjustment effect coefficient K with load
lvalue.
3. the construction method of regional power grid real-time electric power equilibrium of supply and demand index according to claim 1, is characterized in that:
The generating general power P in described a certain moment of regional power grid
t_ generatingcomputation model be:
Wherein, i=1,2 ..., n represents the number of all kinds of generating plant in regional power grid, P
i, t_ generatingthe generated output that represents t moment i generating plant, its numerical value obtains from the SCADA of regional power grid dispatching center system;
The generating stand-by heat general power P in described a certain moment of regional power grid
t_ is for subsequent usecomputation model be:
Wherein, i=1,2 ..., n represents to provide i generating plant of stand-by heat and sends into power interconnection point, P
i, t_ is for subsequent userepresenting t moment i generating plant or sending into interconnection point provides the numerical value of stand-by heat power, and this numerical value all obtains from SCADA system;
The load general power P in a certain moment of described regional power grid regional power grid
t_ loadcomputation model be:
Wherein, i=1,2 ..., n represents i load bus; P
i, t_ loadthe load power that represents t moment node i, its numerical value obtains from SCADA system;
The power cuts to limit consumption general power P in described a certain moment of regional power grid
t_ rations the power supplycomputation model be:
Wherein, i=1,2 ..., n represents i load bus; P
i, t_ rations the power supplythe power cuts to limit consumption power that represents t moment load bus i, its numerical value obtains from SCADA system;
The interconnection in described a certain moment of regional power grid is sent into general power general power P
t_ sends intocomputation model be:
Wherein, i=1,2 ..., n represents i interconnection point, P
i, t_ sends intothe general power of sending into that represents t moment contact point i, its numerical value obtains from SCADA system.
The interconnection in described a certain moment of regional power grid is sent into general power general power P
t_ sendsobtain by following calculated with mathematical model:
Wherein, i=1,2 ..., n represents i interconnection point, P
i, t_ sendsthe general power of sending that represents t moment contact point i, its numerical value obtains from SCADA system.
The generating in described a certain moment of regional power grid regulates effect power P
the t_ adjusting of generating electricitycalculate by following mathematic(al) mode:
P
the t_ adjusting of generating electricity=-K
g× Δ f
t
Wherein, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid, K
gfor the frequency adjustment effect coefficient of regional power grid equivalent generator group, this coefficient is placed in power supply and demand balance index construction software module in advance.
The adjustment effect of load power P in described a certain moment of regional power grid
t_ Load Regulationobtain by following calculated with mathematical model:
P
t_ Load Regulation=K
lΔ f
t
Wherein, Δ f
t=f
e-f
t, f
efor regional power grid rated frequency, f
tfor the frequency of t moment regional power grid, KL is the frequency adjustment effect coefficient of load, and this coefficient is placed in power supply and demand balance index construction software module in advance.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026081A (en) * | 2016-06-22 | 2016-10-12 | 中国电力科学研究院 | Real-time dispatching method for heating through abandoned wind power |
| CN108258722A (en) * | 2018-01-09 | 2018-07-06 | 国网辽宁省电力有限公司 | A kind of work(frequency technology for promoting power grid new energy and receiving ability |
| CN108695888A (en) * | 2018-05-29 | 2018-10-23 | 国网能源研究院有限公司 | A kind of generation of electricity by new energy consumption early warning analysis method |
| CN111062001A (en) * | 2019-12-12 | 2020-04-24 | 深圳供电局有限公司 | Power generation and utilization load loss statistics display method and system |
| CN111594908A (en) * | 2020-05-18 | 2020-08-28 | 北京嘉洁能科技股份有限公司 | Carbon fiber electric heating power load balancing system and method |
| CN116757409A (en) * | 2023-06-06 | 2023-09-15 | 杭州繁胜科技有限公司 | Fuzzy matching-based power material supply and demand dynamic balancing method for research and judgment |
-
2014
- 2014-01-24 CN CN201410036382.3A patent/CN103793855B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 胡兆光: "电力供需指数研究", 《中国电力》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026081A (en) * | 2016-06-22 | 2016-10-12 | 中国电力科学研究院 | Real-time dispatching method for heating through abandoned wind power |
| CN106026081B (en) * | 2016-06-22 | 2021-10-29 | 中国电力科学研究院 | Real-time scheduling method for heating by using abandoned wind power |
| CN108258722A (en) * | 2018-01-09 | 2018-07-06 | 国网辽宁省电力有限公司 | A kind of work(frequency technology for promoting power grid new energy and receiving ability |
| CN108258722B (en) * | 2018-01-09 | 2022-08-09 | 国网辽宁省电力有限公司 | Power frequency technology for improving new energy receiving capacity of power grid |
| CN108695888A (en) * | 2018-05-29 | 2018-10-23 | 国网能源研究院有限公司 | A kind of generation of electricity by new energy consumption early warning analysis method |
| CN111062001A (en) * | 2019-12-12 | 2020-04-24 | 深圳供电局有限公司 | Power generation and utilization load loss statistics display method and system |
| CN111062001B (en) * | 2019-12-12 | 2023-06-27 | 深圳供电局有限公司 | Power generation load loss statistical display method and system |
| CN111594908A (en) * | 2020-05-18 | 2020-08-28 | 北京嘉洁能科技股份有限公司 | Carbon fiber electric heating power load balancing system and method |
| CN116757409A (en) * | 2023-06-06 | 2023-09-15 | 杭州繁胜科技有限公司 | Fuzzy matching-based power material supply and demand dynamic balancing method for research and judgment |
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| CN103793855B (en) | 2017-02-15 |
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