CN107563586A - A kind of ahead market based on step power station coupled relation goes out clear mechanism system - Google Patents
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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
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- 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
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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
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Abstract
Go out clear mechanism system the invention discloses a kind of ahead market based on step power station coupled relation to comprise the following steps：Step 1：Upstream power station and downstream power station report quotation information；Step 2：Establish and consider that the ahead market in upstream power station and downstream power station coupled relation goes out clear Optimized model；Step 3：Carry out ahead market goes out clear stream journey, it is an object of the invention to provide the principle and model that a kind of ahead market based on step power station coupled relation goes out clear, realize upstream and downstream power station combine it is clear, solve lower station acceptance of the bid electricity with can generating flow match unbalance.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a principle and a model of a day-ahead market clearing mechanism based on a coupling relation of cascade hydropower stations.
Background
Through years of basin rolling development, China has built a plurality of cascade hydropower stations, and with the gradual promotion of electric power marketization construction, the participation of cascade hydropower in an electric power market and the price competition of other hydropower and thermal power on the same station become trends. The cascade hydropower development mode is that a large storage tap hydropower station is built at the upstream, and a series of no/daily regulation hydropower stations are arranged at the downstream. The upstream power station benefits from excellent regulation and storage capacity, and flexible bidding can be predicted according to runoff and market situations; the dependence of the downstream power station on the compensation and adjustment of the upstream power station is strong, independent bidding is difficult, and the hydropower resources can be optimally configured by the coordination of each step. However, the phenomenon that the investment main bodies of cascade hydropower stations are not unified generally exists in China, and the upstream hydropower station lacks the driving force for considering the power generation benefits of the downstream hydropower station, so that the full-flow-domain hydropower resource joint optimization is difficult to realize.
In order to solve the problems, some scholars try to realize the cascade hydropower combined operation through an agent agency mechanism, a combined power generation company or a cascade coordination mechanism, and explore a cascade power station combined operation benefit sharing and benefit compensation mechanism in the power market environment so as to promote the smooth implementation of unified scheduling. However, in reality, the main bodies of construction and operation of each cascade hydropower station are different, even developed across provinces, reservoir hydrological information is not standard, and information sharing is seriously hindered, which is contrary to implementation of unified scheduling. In addition, the owner is sensitive to the benefit distribution of joint bidding and collaborative operation, and is more inclined to independent operation when the expected income cannot be met. The market strategy belongs to private information, and the downstream hydropower station is difficult to accurately acquire the upstream hydropower station bidding information, so that the bidding electric quantity and the real power generation quantity are unbalanced to cause 'undergeneration' or 'water abandonment', and the market instability and the water resource waste are brought. Starting from the design of the top layer of the electric power market, the hydraulic and electric coupling relation between cascade upstream and downstream hydropower stations is considered in the market clearing mechanism, and perhaps the problems can be easily solved.
The electricity market can be divided on a time scale into a medium-long term market, a short term market, a day-ahead market, and a real-time market. The upstream well-regulated hydropower station can participate in all kinds of transactions in the whole period, while the downstream non-daily regulated hydropower station is influenced by runoff randomness, is difficult to predict output in a medium-long term and is suitable for participating in the day-ahead market and the real-time market. Most market main part electric quantity trading and electric power electric quantity balance work of an electric power system are completed in the market at the day ahead, and the real-time market is only used for generating capacity deviation and unbalanced power adjustment. Therefore, the acquisition of the bid amount in the day-ahead market of the downstream power station is the key for finishing the day-ahead clearing and determining the clearing price, and is also the basis for making an operation plan.
It is therefore desirable to have a concept and model for a day-ahead market clearing mechanism based on cascade hydropower station coupling relations that overcomes or at least alleviates the problems of the prior art.
Disclosure of Invention
The invention aims to provide a principle and a model of a day-ahead market clearing mechanism based on a coupling relation of cascade hydropower stations, realize combined clearing of upstream and downstream power stations, and solve the problem of unbalance matching between the bid amount and the generating capacity amount in the downstream power stations.
The invention provides a day-ahead market clearing mechanism system based on a coupling relation of cascade hydropower stations, which is characterized by comprising the following steps of:
the method comprises the following steps: reporting quotation information by an upstream hydropower station and a downstream hydropower station;
step two: establishing a day-ahead market clearing optimization model considering the coupling relation between an upstream hydropower station and a downstream hydropower station;
step three: and carrying out the clearing process of the market in the day ahead.
Preferably, the reporting of the quotation information by the upstream hydropower station in the first step includes: submitting unit output constraint, climbing rate constraint, declared capacity section and section price, current reservoir level and water abandoning flow to a trading center according to market supply and demand situation and price prediction, and determining piecewise linear parameters in an upstream power station output and power generation flow relation formula described by piecewise linear function according to the current reservoir level by the trading centerAnd
preferably, the reporting of the quotation information by the downstream hydropower station in the first step includes:
1) prediction interval inflow curve Id,t，t＝1,2,…,T；
2) Obtaining piecewise linear parameters in piecewise linear function of output and lower discharge flow according to current reservoir water level
Preferably, a cascade hydropower station output model is established, and the output of the cascade hydropower station in the time period t is expressed as follows:
wherein i is the number of the cascade hydropower station ηiThe comprehensive output coefficient of the hydropower station i is obtained;is the generated flow in the time period t and has the unit m3/s；Hi,tThe unit is the water purification head of the hydropower station i in the time period t; zi,t、Respectively, the decision reservoir water level and the tail water level of the hydropower station i in the time period t, unit m,the head loss of the hydropower station i in the time period t is unit m, and the drainage flow of the hydropower station comprises the power generation flowFlow of reclaimed waterWhen water discard occursThenTaking the upper limit of the generated currentWithout waste waterThe amount of current is obtained from the amount of current discharged
Establishing a water quantity balance relation between the upstream hydropower station and the downstream hydropower station in a cascade manner, wherein the warehousing flow of the downstream hydropower station is determined by the interval inflow and the downstream discharge flow of the upstream hydropower station, and the water storage quantity of a reservoir of the downstream hydropower station at the end of the t period is as follows:
wherein u and d subscripts represent upstream and downstream hydropower stations, respectively; vd,t-1、Vd,tThe decision storage capacity of downstream power stations at the end of t-1 and t time periods respectively is unit hundred million m3；Id,tThe unit m is the warehousing flow of a downstream power station and the natural inflow of an interval within a time period t3/s；τu,dWater flow time lag between an upstream power station and a downstream power station; e.g. of the typeγFor river channel planarization factor, downstream station inflow and upstream station τu,dThe formula for the previous multiple period bleed is:
wherein S, s are the number of periods and the number of periods affecting the inflow of the downstream plant, ξ respectivelysIs a coefficient of proportionality that is,
according to the position of adjacent two-stage hydropower stations, the connection mode of the cascade hydropower stations comprises the following steps: overlapped connection, connection or discontinuous connection, eγAnd τu,dThe values are different according to the connection mode; the cascade hydropower stations are overlapped and connected, the tail water level of an upstream power station is connected with the front pool water level of a downstream power station, two adjacent stages of hydropower stations are built in a mountain river channel, the distance between the two adjacent stages of hydropower stations is short, the discharge flow of the upstream power station is rapid, the water flow time lag and the river channel planarization can be ignored, namely tauu,d＝0，eγ1, under the warehousing balance operation mode of a downstream power station, the power generation flow is the discharge flow of the upstream power station; the discontinuously connected cascade hydroelectric upstream power station and the discontinuously connected cascade hydroelectric downstream power station have a certain distance, and the water flow time lag and the flow process line planarization are not negligible;
establishing a coupling relation between an upstream hydropower station and a downstream hydropower station, neglecting the nonlinear relation among the water level change of a front pool, the tail water level, the head loss and the downward discharge flow in operation in a day by the upstream large-storage-capacity hydropower station, leading the output of the hydroelectric generating set and the generating flow to be in the nonlinear relation, and adopting a piecewise linear function to describe the output-generating flow relation of the upstream hydropower station in order to simplify calculation and reduce errors:
wherein k isuIn order to number the segment intervals,the parameters are piecewise linear fitting parameters which are mainly determined by the front pool water level and the comprehensive output coefficient in the time period t and the correlation coefficients of the tail water level, the head loss and the downward discharge flow;assuming that a downstream non-daily regulation hydropower station runs in a warehousing balance mode for the power generation flow of an upstream power station, neglecting the fluctuation of the front pool water level, wherein the lower leakage flow is the leakage flow and the interval inflow of the upstream power station, and the output is also expressed as a piecewise linear function related to the lower leakage flow:
wherein,respectively, segmented linear fitting parameters within the time period t,for the downstream hydropower station power generation flow, the formula (7) is substituted into the formula (8) to obtain:
wherein,are all fixed parameters, Id,t、For the input quantity, equation (9) can be expressed as:
equation (10) is the power coupling relationship between upstream and downstream hydropower stations, αt、βtFor the coupling coefficient:
the flat dry period of the upstream power station runs in a water abandoning-free mode,if water abandon occurs in the rich water period, the upstream power station outputs full load and steadily abandons water without considering water flow time lag and flow line planarization, namely tauu,d＝0，eγ＝1。
Preferably, the trading center in the second step passes throughAndsubstituting the parameters, the water reject flow of the upstream power station and the inflow data of the downstream power station into a formula (11) to determine the power coupling coefficient α of the upstream power stationtDownstream plant power coupling coefficient βtFor embodying the power coupling relationship between the upstream and downstream power stationsIn special consideration, the reported capacity section and section price of the upstream power station and the capacity of the corresponding coupling section of the downstream power station are separately described in a day-ahead clearing optimization model:
wherein, Jud,tThe step upstream hydropower station and the step downstream hydropower station are willing to generate income within the time period t; respectively at time t, t-tau for upstream power stationsu,dInner volume segment kGThe winning capacity of each generator in each capacity section in each time period is the optimized variable.
Preferably, the constraints of the day-ahead clearing optimization model include:
① downstream hydropower station output restriction, considering the situation that the downstream hydropower station warehousing flow exceeds the diversion flow limit, the formula (10) is expressed as:
wherein,maximum output and minimum output of a downstream power station;
② the bid capacity balance constraint is expressed as:
preferably, after receiving the quotation information of each market member, the trading center clears the market according to the optimization model, and the clearing process of the market in the future comprises the following steps:
1) reporting capacity section and section price, current reservoir water level and water abandoning flow by an upstream hydropower station, reporting interval inflow curve and piecewise linear parameters by a downstream hydropower station
2) The trading center determines piecewise linear parameters according to the current reservoir water level of an upstream power station
3) The transaction center calculates the electric power coupling coefficient a of the upstream power station and the downstream power stationt、βt；
4) The electricity purchasing businessmen and other power generators quote, and the trading center finishes clearing of the market in the day before;
5) the trading center publishes the price of the clear electricity and the medium-grade capacity.
The invention discloses a day-ahead market clearing mechanism system based on a coupling relation of cascade hydropower stations, wherein the day-ahead market clearing mechanism deeply analyzes the hydraulic and electric coupling relation between cascade upstream and downstream hydropower stations and considers the coupling relation in the day-ahead market clearing process: the upstream power station participates in daily market bidding, the downstream power station serves as a price receiver, the reported electric quantity of the downstream power station is expressed as a linear function about the reported electric quantity of the upstream power station, and a daily market clearing optimization model is integrated, so that combined clearing of the upstream power station and the downstream power station is realized, and the problem of imbalance in matching between the bid electric quantity and the current generating quantity in the downstream power station is solved; the influence of water flow time lag between an upper power station and a lower power station on the operation of a downstream power station is mainly considered in the discharging process so as to ensure that the actual power generation capacity is consistent with the day-ahead output plan.
Drawings
Fig. 1 is a schematic diagram of 3-segment quotes from electricity and power suppliers.
Fig. 2 is a schematic diagram of a market clearing.
FIG. 3 is a flow chart of market clearing at the day-ahead.
Fig. 4 is a bid amount for a power generator.
Fig. 5 shows bid amount in the electricity purchasing company.
FIG. 6 is an upstream power plant quote, clearing price and total bid amount.
FIG. 7 shows the bid and bid winning capacity of upstream and downstream power stations.
FIG. 8 shows the bid and bid winning capacity of upstream and downstream stations in the water-rich period without time lag.
Fig. 9 is a plot of bid capacity for all generators.
FIG. 10 shows the bid and bid winning capacity for the flat dry period, the upstream and downstream stations without time lag.
FIG. 11 is a simulated clearing price and upstream power plant quote for a lag market with/without water flow.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Considering the general characteristic of variable cost of power generation, in order to facilitate market trading settlement, some power markets adopt a staged step quotation mechanism (referred to as staged quotation for short), which requires market members to submit bidding data of each trading period of the next day to a trading center in advance one day, wherein the bidding data comprises stage price and corresponding stage capacity. The price quoted by the generator is required to be monotonically increased along with the increment of the capacity section; the price of the electricity purchasing company (including the electricity selling company and the power consumer) is monotonously decreased instead.
As shown in fig. 1, PD and PG are segment capacities declared by electricity and power suppliers, respectively; and pi D and pi G are respectively quoted prices of corresponding section capacities of the electricity purchasing company and the electricity generating company.
As shown in fig. 2, the trading center integrates the section capacity and the section price declared by the electricity purchasing company and the electricity generating company in each time period into a corresponding supply curve and a corresponding demand curve. According to the equilibrium of supply and demand, the intersection point of the supply and demand curves is the uniform Market Clearing Price (MCP) and the clear electricity (or the medium standard capacity).
The optimization model of the day-ahead market segmented quotation and unified clearing mechanism aims at maximizing social welfare and is expressed as follows:
in the formula: j is the total social welfare brought by the transaction; t and T are the total period and the time interval index respectively; subscripts D and G denote the electricity and electricity suppliers, respectively; n is a radical ofD、NG、nD、nGRespectively indexing the total number and the serial number of the electricity purchasing businessmen, the electricity generating businessmen and the electricity generating businessmen participating in the market in the day ahead; kD、KG、kD、kGThe number and phase of the capacity sections which can be declared by the electricity purchasing businessman and the electricity generating businessman respectivelyThe number of the corresponding segment;respectively purchasing electricity suppliers n for time period tDIn the capacity section kDAnd a generator nGIn the capacity section kGQuoted price (m/MW h) and medium capacity (MW); and deltat is the market member quotation period, and the embodiment takes 1 h.
The constraints considered mainly include: the method comprises the following steps of power generator and power purchasing company bid capacity balance constraint, power generator unit output and climbing constraint, power purchasing company declared capacity constraint, power generator and power purchasing company bid capacity constraint and the like.
Market trading simulation was conducted with a system containing 6 electricity producers and 8 electricity purchasers. The power generators 5 and 6 are hydroelectric upstream and downstream power stations of a certain step respectively, and the operation parameters are shown in an attached table A1; other power generators are conventional thermal power plants and the operating parameters are shown in the attached table a 2. The 8 electricity purchasing merchants comprise 4 large industrial customers, 2 commercial customers and 2 electricity selling companies, and the electricity consumption data are shown in an attached table A3.
Table a1 cascade hydropower station operating parameters
TABLE A2 Generator run set parameters
TABLE A3 commercial power purchase
In order to verify the adaptability of the proposed clearing mechanism to different connection modes of the cascade hydropower stations, the embodiment simulates two conditions of no-water-flow time lag and 2 h-water-flow time lag of an upstream power station and a downstream power station, and takes a typical day of a flat dry period and a rich water period as an example to perform analysis respectively.
The method comprises the following steps of performing day-ahead market clearing analysis (no water flow time lag between an upstream power station and a downstream power station), and analyzing typical day market clearing results in a flat withering period and a rich water period respectively on the assumption that the upstream power station and the downstream power station are connected in a connecting mode, the distance is short, the water flow of a middle river channel is rapid, the influence of the water flow time lag on the operation of the downstream power station is weak and negligible.
As shown in fig. 3, the clearing process of the day-ahead market includes the following steps:
1. reporting capacity section and section price, current reservoir water level and water abandoning flow by an upstream hydropower station, reporting interval inflow curve and piecewise linear parameters by a downstream hydropower station
2. The trading center determines piecewise linear parameters according to the current reservoir water level of an upstream power station
3. The transaction center calculates the electric power coupling coefficient a of the upstream power station and the downstream power stationt、βt；
4. The electricity purchasing businessmen and other power generators quote, and the trading center finishes clearing of the market in the day before;
5. the trading center publishes the price of the clear electricity and the medium-grade capacity.
1) Typical day of moderate withering period
As shown in fig. 4 and 5, the plot of the capacities in the thermal power plants in the power generation companies is overall smooth, and the output is increased only during the peak load period, but the fluctuation range is limited, for example: generators 2 and 4 avoid marginal units and increase declared capacity smoothly during the day. The upstream hydropower station unit is flexible to operate, and carries out strategic quotation to track load and electricity price change, wherein the bid capacity tends to be consistent with the load change, and the marginal unit is borne during some load peak periods, as shown in fig. 6, the clearing price, the highest section price of the upstream hydropower station and the total bid capacity curve of the whole system are given. The electricity utilization curve of large industrial users in electricity purchasing companies is stable, the price quotation is high, the winning capacity curve is relatively stable (such as electricity purchasing companies 1 and 2), small and medium-sized industrial and commercial users and residential users in the agents of electricity selling companies are the most active roles in the electricity market, the price quotation is flexible, and the peak valley of the winning capacity curve is clear.
As shown in fig. 6, the reservoir capacity of the upstream hydropower station in the average dry period is loose, the flood control pressure is not generated, and in the simulation system, the upstream hydropower station accounts for 24.43% of the total installation, so that a reasonable bidding strategy is formulated by using limited water storage, price change is tracked, more benefits are obtained from low-storage and high-storage issues, the marginal unit is borne in 7, 10-12 and other periods, and the highest declared section price is taken as the market clearing price. The method is consistent with the situation that in actual power market bidding, power generation enterprises with large installed proportion carry out strategic quotation according to opportunity cost and bear the profit-making of marginal units.
As shown in fig. 7, in the day-ahead market bidding process, the upstream power station declares the capacity section, the bid-winning capacity, and the downstream power station biddable section capacity and the bid-winning capacity obtained by the trading center according to the power coupling relationship between the upstream power station and the downstream power station. Therefore, the following steps are carried out: because the output of the upstream hydropower station and the downstream hydropower station is in a linear relation, and the bid amount of the downstream hydropower station depends on the bid amount of the upstream hydropower station, the reported capacities of the upstream hydropower station and the downstream hydropower station and the change trend of the bid amount are consistent in each time period. The highest price of the upstream power station is declared to be lower than or equal to the clearing price of the market in most time periods, the upstream and downstream hydropower stations almost win the full capacity, only in some time periods (for example, 21-24 hours), the market is wide in supply and demand, the clearing price is low, and the full capacity cannot be won. Under the day-ahead market clearing mechanism considering the coupling relation of the upstream power station and the downstream power station, the downstream power station can obtain a bid-winning capacity curve matched with the upstream incoming water without the bidding information of the upstream power station, the operation in the day is arranged according to the capacity curve, no water is abandoned in the whole process, the trend of the water-electricity resource is converged with the trend of the load demand curve, the utilization of the water-electricity resource is promoted, and the safe and stable operation of the system is facilitated.
2) Typical day of full water period
In the rich water period, the main targets of guaranteeing the consumption scale and avoiding water abandonment are the operation of the hydropower station. At this time, the quoted price of each capacity section of the upstream hydropower station in the day-ahead market is low and is also a price acceptor, so that the capacity is almost fully loaded in the day-ahead operation, the downstream hydropower station also outputs straight line, and the bidding capacity section and the medium-standard capacity curve of the typical day-up and downstream hydropower stations in the rich water period are shown in fig. 8.
As shown in fig. 9, the bid capacity curve of all power generators shows: in the simulated system, the proportion of the installed hydropower reaches 43.97%, each hydropower generates a great deal in the water-rich period, the supply and demand are obvious, the price of each power generator is low, and the market price is reduced. The thermal power plant operates on its entire reduced capacity with marginal units (e.g., generators 1 and 3) being charged only during some peak load periods.
The method is characterized in that the method mainly analyzes the influence of typical daily water flow time lag in a flat dry period on the coming market clearing result. As shown in FIG. 10, the capacity of the reporting section of the typical upstream and downstream hydropower stations in the average dry period and the medium-winning capacity curve are shown. As shown in fig. 11, the day-ahead market clearing price and the maximum declared section price of the upstream power station were respectively simulated by the upstream and downstream hydropower stations with/without water flow time lag.
As shown in fig. 10: in the withering period, the upstream power station strategically quotes to enable the bid-winning capacity curve to fluctuate greatly and be influenced by water flow time lag, the bid-winning capacity curve in the downstream power station is obviously lagged behind the upstream power station, and fluctuation is weakened, because the flow peak value is weakened along the way by river channel planarization, and the flow thread presents certain peak clipping and valley filling. Compared with the day-ahead market clearing simulation of the upstream and downstream power stations without water flow time lag (see fig. 7), under the same quotation, the bid amount in the upstream power station obviously changes in some time periods, such as: the 11h reduction was 17.64MW and the 12h reduction was 45.60 MW. The reason is as follows: when no water flow time lag simulation is carried out, the strategic quotation of the upstream power station is borne by the marginal unit within 7, 10-12 h; when water flow time lag simulation exists, the bid amount of the downstream power station in the current time period is determined by the bid amount of the upstream power station 2h before, the bid amount is already a fixed value, the supply curve in each time period is translated, the influence of output curve change of the downstream power station is brought by superposed water flow planarization, and the upstream power station only bears the marginal unit in 11h, which is shown in figure 11. The bid-winning capacity corresponding to the marginal price is distributed by each power generator according to the declared capacity in the same proportion, the bid-winning capacity of the downstream power station is determined to be a fixed value before 2h, and the bid-winning capacity at the marginal price is not distributed in proportion any more, so that the bid-winning capacity of the upstream power station 11h is reduced. The cut-off of the bid amount 12h in the upstream power station is caused by the non-bid of the highest capacity section; the bid capacities in 7h and 10h are not changed, because the upstream power station is a marginal unit and the full capacity is bid in the no-water-flow time-delay simulation, and the upstream power station is no longer used as the marginal unit in the 2 h-water-flow time-delay simulation but is also the full capacity. The upstream power station does not bear the marginal unit in other periods, and the bid winning capacity is unchanged.
The invention provides a day-ahead market clearing mechanism considering the coupling relation of upstream and downstream power stations, and converts the water flow relation of the upstream and downstream power stations into a linear function of output to be fused into a clearing optimization model, so that a trading center can clear the upstream and downstream power stations jointly only according to the output coupling coefficients of the upstream and downstream power stations, the problem of unbalanced power generation flow matching caused by asymmetric information of the downstream power stations in market trading is solved, the trading risk is relieved, and reference is provided for the enrichment of hydropower in China, particularly the construction of spot markets in areas with large scale of weak regulating capacity hydropower stations.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A day-ahead market clearing mechanism system based on a cascade hydropower station coupling relation is characterized by comprising the following steps of:
the method comprises the following steps: reporting quotation information by an upstream hydropower station and a downstream hydropower station;
step two: establishing a day-ahead market clearing optimization model considering the coupling relation between an upstream hydropower station and a downstream hydropower station;
step three: and carrying out the clearing process of the market in the day ahead.
2. Such asThe step hydropower station coupling relation-based day-ahead market clearing mechanism system of claim 1, wherein: the reporting of the quotation information by the upstream hydropower station in the first step comprises the following steps: submitting unit output constraint, climbing rate constraint, declared capacity section and section price, current reservoir level and water abandoning flow to a trading center according to market supply and demand situation and price prediction, and determining piecewise linear parameters in an upstream power station output and power generation flow relation formula described by piecewise linear function according to the current reservoir level by the trading centerAnd
3. the step-hydropower-station-coupling-relationship-based day-ahead market clearing mechanism system according to claim 1, wherein: the reporting of the quotation information of the downstream hydropower station in the first step comprises the following steps:
1) prediction interval inflow curve Id,t，t＝1,2,…,T；
2) Obtaining piecewise linear parameters in piecewise linear function of output and lower discharge flow according to current reservoir water level
4. A day-ahead market clearing mechanism system based on a cascaded hydropower station coupling relation according to claim 2 or 3, characterized in that: establishing a cascade hydropower station output model, wherein the output of the cascade hydropower station in the time period t is expressed as follows:
<mrow> <msub> <mi>P</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>&eta;</mi> <mi>i</mi> </msub> <mo>&CenterDot;</mo> <msubsup> <mi>Q</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>H</mi> </msubsup> <mo>&CenterDot;</mo> <msub> <mi>H</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <msub> <mi>H</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Z</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>Z</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> </mrow> <mn>2</mn> </mfrac> <mo>-</mo> <msubsup> <mi>Z</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>d</mi> </msubsup> <mo>-</mo> <msubsup> <mi>H</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>d</mi> </msubsup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
wherein i is the number of the cascade hydropower station ηiThe comprehensive output coefficient of the hydropower station i is obtained;is the generated flow in the time period t and has the unit m3/s；Hi,tThe unit is the water purification head of the hydropower station i in the time period t; zi,t、Respectively, the decision reservoir water level and the tail water level of the hydropower station i in the time period t, unit m,the head loss of the hydropower station i in the time period t is unit m, and the drainage flow of the hydropower station comprises the power generation flowFlow of reclaimed waterWhen water discard occursThenTaking the upper limit of the generated currentWithout waste waterThe amount of current is obtained from the amount of current discharged
Establishing a water quantity balance relation between the upstream hydropower station and the downstream hydropower station in a cascade manner, wherein the warehousing flow of the downstream hydropower station is determined by the interval inflow and the downstream discharge flow of the upstream hydropower station, and the water storage quantity of a reservoir of the downstream hydropower station at the end of the t period is as follows:
<mrow> <msub> <mi>V</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mo>&lsqb;</mo> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msubsup> <mo>-</mo> <mrow> <mo>(</mo> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>H</mi> </msubsup> <mo>+</mo> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>D</mi> </msubsup> <mo>)</mo> </mrow> <mo>&rsqb;</mo> <mo>&times;</mo> <mi>&Delta;</mi> <mi>t</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msubsup> <mo>=</mo> <msub> <mi>I</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>H</mi> </msubsup> <mo>+</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>D</mi> </msubsup> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
wherein u and d subscripts represent upstream and downstream hydropower stations, respectively; vd,t-1、Vd,tThe decision storage capacity of downstream power stations at the end of t-1 and t time periods respectively is unit hundred million m3；Id,tThe unit m is the warehousing flow of a downstream power station and the natural inflow of an interval within a time period t3/s；τu,dWater flow time lag between an upstream power station and a downstream power station; e.g. of the typeγFor river channel planarization factor, downstream station inflow and upstream station τu,dThe formula for the previous multiple period bleed is:
<mrow> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msubsup> <mo>=</mo> <msub> <mi>I</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>s</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>S</mi> </munderover> <msub> <mi>&xi;</mi> <mi>s</mi> </msub> <mrow> <mo>(</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <mi>s</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>H</mi> </msubsup> <mo>+</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <mi>s</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>D</mi> </msubsup> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
wherein S, s are the number of periods and the number of periods affecting the inflow of the downstream plant, ξ respectivelysIs a coefficient of proportionality that is,
according to the position of adjacent two-stage hydropower stations, the connection mode of the cascade hydropower stations comprises the following steps: overlapped connection, connection or discontinuous connection, eγAnd τu,dThe values are different according to the connection mode; the cascade hydropower stations are overlapped and connected, the tail water level of an upstream power station is connected with the front pool water level of a downstream power station, two adjacent stages of hydropower stations are built in a mountain river channel, the distance between the two adjacent stages of hydropower stations is short, the discharge flow of the upstream power station is rapid, the water flow time lag and the river channel planarization can be ignored, namely tauu,d＝0，eγ1, under the warehousing balance operation mode of a downstream power station, the power generation flow is the discharge flow of the upstream power station; the discontinuously connected cascade hydroelectric upstream power station and the discontinuously connected cascade hydroelectric downstream power station have a certain distance, and the water flow time lag and the flow process line planarization are not negligible;
establishing a coupling relation between an upstream hydropower station and a downstream hydropower station, neglecting the nonlinear relation among the water level change of a front pool, the tail water level, the head loss and the downward discharge flow in operation in a day by the upstream large-storage-capacity hydropower station, leading the output of the hydroelectric generating set and the generating flow to be in the nonlinear relation, and adopting a piecewise linear function to describe the output-generating flow relation of the upstream hydropower station in order to simplify calculation and reduce errors:
<mrow> <msub> <mi>P</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <msubsup> <mi>a</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>H</mi> </msubsup> <mo>+</mo> <msubsup> <mi>b</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
wherein k isuIn order to number the segment intervals,the parameters are piecewise linear fitting parameters which are mainly determined by the front pool water level and the comprehensive output coefficient in the time period t and the correlation coefficients of the tail water level, the head loss and the downward discharge flow;assuming that a downstream non-daily regulation hydropower station runs in a warehousing balance mode for the power generation flow of an upstream power station, neglecting the fluctuation of the front pool water level, wherein the lower leakage flow is the leakage flow and the interval inflow of the upstream power station, and the output is also expressed as a piecewise linear function related to the lower leakage flow:
<mrow> <mtable> <mtr> <mtd> <mrow> <msubsup> <mi>P</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>k</mi> </msubsup> <mo>=</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>H</mi> </msubsup> <mo>+</mo> <msubsup> <mi>b</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msub> <mi>I</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mo>&CenterDot;</mo> <mo>(</mo> <mrow> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>H</mi> </msubsup> <mo>+</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>d</mi> </msubsup> </mrow> <mo>)</mo> <mo>)</mo> </mrow> <mo>+</mo> <msubsup> <mi>d</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> </mrow>
wherein,respectively, segmented linear fitting parameters within the time period t,for the downstream hydropower station power generation flow, the formula (7) is substituted into the formula (8) to obtain:
<mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <mrow> <mo>&lsqb;</mo> <mrow> <msub> <mi>I</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mo>&CenterDot;</mo> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> <mo>-</mo> <msubsup> <mi>b</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> <mo>)</mo> <mo>/</mo> <msubsup> <mi>a</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>d</mi> </msubsup> </mrow> </mtd> </mtr> </mtable> </mfenced> </mrow> <mo>&rsqb;</mo> </mrow> <mo>+</mo> <msubsup> <mi>b</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <mrow> <mo>(</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mo>/</mo> <msubsup> <mi>a</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> <mo>)</mo> </mrow> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msub> <mi>I</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mo>&CenterDot;</mo> <mo>(</mo> <mrow> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>d</mi> </msubsup> <mo>-</mo> <msubsup> <mi>b</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> <mo>/</mo> <msubsup> <mi>a</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> </mrow> <mo>)</mo> <mo>)</mo> </mrow> <mo>+</mo> <msubsup> <mi>b</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>k</mi> </msubsup> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>8</mn> <mo>)</mo> </mrow> </mrow>
wherein,are all fixed parameters, Id,t、For the input quantity, equation (9) can be expressed as:
<mrow> <msub> <mi>P</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>&alpha;</mi> <mi>t</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> <mo>+</mo> <msub> <mi>&beta;</mi> <mi>t</mi> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>9</mn> <mo>)</mo> </mrow> </mrow>
equation (10) is the power coupling relationship between upstream and downstream hydropower stations, αt、βtFor the coupling coefficient:
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&alpha;</mi> <mi>t</mi> </msub> <mo>=</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mo>/</mo> <msubsup> <mi>a</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&beta;</mi> <mi>t</mi> </msub> <mo>=</mo> <msubsup> <mi>a</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>d</mi> </msub> </msubsup> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msub> <mi>I</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <mo>&CenterDot;</mo> <msup> <mi>e</mi> <mi>&gamma;</mi> </msup> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msubsup> <mi>Q</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> <mi>d</mi> </msubsup> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>-</mo> <msubsup> <mi>b</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> <mo>/</mo> <msubsup> <mi>a</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> <msub> <mi>k</mi> <mi>u</mi> </msub> </msubsup> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>)</mo> </mrow> <mo>+</mo> <msubsup> <mi>b</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> <mi>k</mi> </msubsup> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>10</mn> <mo>)</mo> </mrow> </mrow>
the flat dry period of the upstream power station runs in a water abandoning-free mode,if water abandon occurs in the rich water period, the upstream power station outputs full load and steadily abandons water without considering water flow time lag and flow line planarization, namely tauu,d＝0，eγ＝1。
5. The step hydropower station coupling relation-based day-ahead market clearing mechanism system according to claim 4, wherein: in the second step, the transaction center passesAndsubstituting the parameters, the water reject flow of the upstream power station and the inflow data of the downstream power station into a formula (11) to determine the power coupling coefficient α of the upstream power stationtDownstream plant power coupling coefficient βtIn order to embody the special consideration of the power coupling relation of the cascade upstream and downstream power stations, the declared capacity section and section price of the upstream power station and the capacity of the corresponding coupling section of the downstream power station are separately described in a daily clearing optimization model:
<mrow> <mtable> <mtr> <mtd> <mrow> <mi>max</mi> <mi> </mi> <mi>J</mi> <mo>=</mo> <mi>max</mi> <munderover> <mo>&Sigma;</mo> <mrow> <mi>t</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>T</mi> </munderover> <mo>&lsqb;</mo> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>n</mi> <mi>D</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>N</mi> <mi>D</mi> </msub> </munderover> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>k</mi> <mi>D</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>K</mi> <mi>D</mi> </msub> </munderover> <msub> <mi>&pi;</mi> <mrow> <msub> <mi>k</mi> <mi>D</mi> </msub> <mo>,</mo> <msub> <mi>n</mi> <mi>D</mi> </msub> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>D</mi> </msub> <mo>,</mo> <msub> <mi>n</mi> <mi>D</mi> </msub> <mo>,</mo> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>-</mo> <mrow> <mo>(</mo> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>n</mi> <mi>G</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>N</mi> <mi>G</mi> </msub> </munderover> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>K</mi> <mi>G</mi> </msub> </munderover> <msub> <mi>&pi;</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <msub> <mi>n</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <msub> <mi>n</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>J</mi> <mrow> <mi>u</mi> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>&rsqb;</mo> <mo>&CenterDot;</mo> <mi>&Delta;</mi> <mi>t</mi> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>11</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <msub> <mi>J</mi> <mrow> <mi>u</mi> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>K</mi> <mi>G</mi> </msub> </munderover> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&pi;</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>&alpha;</mi> <mi>t</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>&pi;</mi> <mrow> <mn>1</mn> <mo>,</mo> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>&beta;</mi> <mi>t</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>12</mn> <mo>)</mo> </mrow> </mrow>
wherein, Jud,tThe step upstream hydropower station and the step downstream hydropower station are willing to generate income within the time period t; respectively at time t, t-tau for upstream power stationsu,dInner volume segment kGThe winning capacity of each generator in each capacity section in each time period is the optimized variable.
6. The cascade hydropower station coupling relation-based day-ahead market clearing mechanism system according to claim 5, wherein: the constraint conditions of the day-ahead clearing optimization model comprise:
① downstream hydropower station output restriction, considering the situation that the downstream hydropower station warehousing flow exceeds the diversion flow limit, the formula (10) is expressed as:
<mrow> <msub> <mi>P</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>m</mi> <mi>i</mi> <mi>n</mi> <mo>{</mo> <msub> <mi>&alpha;</mi> <mi>t</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> <mo>+</mo> <msub> <mi>&beta;</mi> <mi>t</mi> </msub> <mo>,</mo> <msubsup> <mi>P</mi> <mi>d</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msubsup> <mo>}</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> <mo>{</mo> <msub> <mi>&alpha;</mi> <mi>t</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> <mo>+</mo> <msub> <mi>&beta;</mi> <mi>t</mi> </msub> <mo>,</mo> <msubsup> <mi>P</mi> <mi>d</mi> <mrow> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> </msubsup> <mo>}</mo> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>13</mn> <mo>)</mo> </mrow> </mrow>
wherein,maximum output and minimum output of a downstream power station;
② the bid capacity balance constraint is expressed as:
<mrow> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>n</mi> <mi>D</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>N</mi> <mi>D</mi> </msub> </munderover> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>k</mi> <mi>D</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>K</mi> <mi>D</mi> </msub> </munderover> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>D</mi> </msub> <mo>,</mo> <msub> <mi>n</mi> <mi>D</mi> </msub> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>n</mi> <mi>G</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>N</mi> <mi>G</mi> </msub> </munderover> <munderover> <mo>&Sigma;</mo> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>K</mi> <mi>G</mi> </msub> </munderover> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <msub> <mi>n</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>u</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>&alpha;</mi> <mi>t</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <msub> <mi>k</mi> <mi>G</mi> </msub> <mo>,</mo> <mi>u</mi> <mo>,</mo> <mi>t</mi> <mo>-</mo> <msub> <mi>&tau;</mi> <mrow> <mi>u</mi> <mo>,</mo> <mi>d</mi> </mrow> </msub> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>+</mo> <msub> <mi>&beta;</mi> <mi>t</mi> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>14</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
7. the cascade hydropower station coupling relation-based day-ahead market clearing mechanism system according to claim 5, wherein: after receiving the quotation information of each market member, the trading center clears according to the optimization model, and the clearing process of the market in the future comprises the following steps:
1) reporting capacity section and section price, current reservoir water level and water abandoning flow by an upstream hydropower station, reporting interval inflow curve and piecewise linear parameters by a downstream hydropower station
2) The trading center determines piecewise linear parameters according to the current reservoir water level of an upstream power station
3) The transaction center calculates the electric power coupling coefficient a of the upstream power station and the downstream power stationt、βt；
4) The electricity purchasing businessmen and other power generators quote, and the trading center finishes clearing of the market in the day before;
5) the trading center publishes the price of the clear electricity and the medium-grade capacity.
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