CN111667136A - Clearing method and device for regional power market and storage medium - Google Patents
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Abstract
The invention discloses a clearing method, a clearing device and a storage medium for a regional power market, wherein the method comprises the following steps: establishing an inter-provincial power transmission and reception plan optimization model and solving to obtain an inter-provincial power transmission and reception plan; according to the inter-provincial power transmission and reception plan, establishing a cross-provincial power market clearing model and solving to obtain a cross-provincial power market clearing result; establishing an inter-provincial junctor power plan optimization model and solving according to the inter-provincial power transmission and reception plan to obtain an inter-provincial junctor power plan; according to the inter-provincial connecting line power plan, establishing an intra-provincial power market clearing model and solving to obtain an intra-provincial power market clearing result; and carrying out regional power dispatching according to the cross-provincial power market clearing result and the intra-provincial power market clearing result. The method is beneficial to establishing a transitional two-stage regional power market, eliminating inter-provincial power barriers and better realizing reasonable dispatching of regional power.
Description
Technical Field
The invention relates to the technical field of power system operation scheduling, in particular to a clearing method, a clearing device and a storage medium for a regional power market.
Background
At present, the local electric power market in China has the conditions of uneven distribution and unbalanced output in the aspect of electric power dispatching, on one hand, the electric power market in China cannot be positioned in the national electric power market in a long historical period, because the capacity of the transmission network in China is far from the capacity of the transmission network required by the national electric power market; on the other hand, the electric power market in China cannot be positioned in the provincial electric power market, because the distribution of electric power resources and consumption among the provinces in China is seriously unbalanced, various types of regulators between the large power energy province and the large power consumption province and between the large water and power province and the large thermal power province are necessary, namely the power barrier among the provinces must be broken, and therefore, the establishment of the regional electric power market is almost the only reasonable strategic choice in China.
However, after years of 'entity-saving' operation management, the electricity industry in China has many difficulties in realizing the first-class regional electricity market at night. In the whole process of establishing a perfect first-level regional power market, a good transitional second-level regional power market is necessarily established.
Disclosure of Invention
The embodiment of the invention aims to provide a clearing method, a clearing device and a storage medium for a regional power market, which are beneficial to establishing a transitional two-stage regional power market, eliminating inter-provincial power barriers and better realizing reasonable dispatching of regional power.
To achieve the above object, an embodiment of the present invention provides a clearing method for a regional power market, including the following steps:
establishing an inter-provincial power transmission and reception plan optimization model and solving to obtain an inter-provincial power transmission and reception plan;
according to the inter-provincial power transmission and reception plan, establishing a cross-provincial power market clearing model and solving to obtain a cross-provincial power market clearing result;
establishing an inter-provincial junctor power plan optimization model and solving according to the inter-provincial power transmission and reception plan to obtain an inter-provincial junctor power plan;
according to the inter-provincial connecting line power plan, establishing an intra-provincial power market clearing model and solving to obtain an intra-provincial power market clearing result;
and carrying out regional power dispatching according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
Preferably, the establishing an inter-provincial power transmission and reception plan optimization model and solving to obtain an inter-provincial power transmission and reception plan specifically includes:
simplifying the inter-provincial power grid into a single node, and establishing an inter-provincial power transmission and reception plan optimization model based on the simplified provincial power grid; the inter-provincial power transmission and reception plan optimization model takes the minimization of the variance of each intra-provincial power generation sequence as an objective function;
determining constraint conditions of the inter-provincial power transmission and reception plan optimization model according to intra-provincial power balance constraints, power transmission and reception balance constraints, power generation upper and lower limit constraints of each province, power generation climbing rate constraints of each province, outward transmission channel capacity constraints and inter-provincial daily electric quantity transaction constraints;
and solving the provincial power transmission and reception plan optimization model by using mathematical optimization software to obtain the provincial power transmission and reception plan.
Preferably, the establishing and solving a cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result specifically includes:
according to the inter-provincial power transmission and reception plan, determining power transmission and reception power of the province of the receiving end and a power generator set of the province of the transmitting end;
establishing the cross-provincial electric power market clearing model according to the transmitting and receiving electric power of the receiving-end province and the generator set of the transmitting-end province; the cross-provincial electric power market clearing model takes the minimization of a power generation side quotation function as a target function;
determining constraint conditions of the cross-provincial electric power market clearing model according to supply and demand balance constraint of the sending-receiving province, electric power balance constraint of the sending-end province and generating capacity constraint of a generator set of the sending-end province;
and solving the cross-provincial electric power market clearing model by using mathematical optimization software to obtain a cross-provincial electric power market clearing result.
Preferably, the establishing an inter-provincial tie line power plan optimization model and solving the inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan to obtain the inter-provincial tie line power plan specifically includes:
establishing an inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan; the inter-provincial junctor power plan optimization model takes the minimum total network loss of junctors as an objective function;
determining conventional constraints of the inter-provincial tie line power plan optimization model, which do not contain integer variables, according to maximum power deviation constraints, transmission and reception electric quantity constraints, linear tie line operation constraints and alternating tie line operation constraints;
determining constraints containing integer variables of the inter-provincial tie line power plan optimization model according to power smooth operation constraints, non-retuning constraints in a short time and power regulation frequency constraints;
and solving the inter-provincial junctor power plan optimization model by calling a CPLEX solver to obtain an inter-provincial junctor power plan.
Preferably, the establishing an intra-provincial power market clearing model and solving according to the inter-provincial tie line power plan to obtain an intra-provincial power market clearing result specifically includes:
establishing an intra-provincial electric power market clearing model according to the inter-provincial connecting line power plan; the provincial power market clearing model takes the minimum electricity purchasing cost of the province as an objective function;
determining constraint conditions of the provincial power market clearing model according to system load balance constraint, system spare capacity constraint, line safety constraint and generator set output characteristic constraint;
and solving the provincial power market clearing model by calling a CPLEX solver to obtain a provincial power market clearing result.
Preferably, the performing regional power scheduling according to the cross-provincial power market clearing result and the intra-provincial power market clearing result specifically includes:
according to the cross-provincial electric power market clearing result, first output power and first clearing price of all generator sets of the sending-end province in all time periods are obtained;
according to the provincial electric power market clearing result, obtaining second output power and second clear electricity price of all the generator sets of each province in all time periods;
and scheduling regional power according to the first output power, the first clear electricity price, the second output power and the second clear electricity price.
Another embodiment of the present invention provides a clearing apparatus for a regional power market, the apparatus including:
the first model establishing module is used for establishing an inter-provincial power transmission and reception plan optimization model and solving the inter-provincial power transmission and reception plan to obtain an inter-provincial power transmission and reception plan;
the second model establishing module is used for establishing a cross-provincial power market clearing model and solving the cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result;
the third model establishing module is used for establishing an inter-provincial junctor power plan optimization model and solving the inter-provincial junctor power plan according to the inter-provincial power transmission and reception plan to obtain an inter-provincial junctor power plan;
the fourth model establishing module is used for establishing an provincial power market clearing model and solving the provincial power market clearing model according to the power plan of the inter-provincial connecting line to obtain an provincial power market clearing result;
and the scheduling module is used for performing regional power scheduling according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
The invention correspondingly provides a device using the method for clearing the regional power market, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the method for clearing the regional power market according to any one of the above items when executing the computer program.
Yet another embodiment of the present invention provides a computer-readable storage medium comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for clearing a regional power market according to any one of the above.
Compared with the prior art, the clearing method, the clearing device and the storage medium for the regional power market provided by the embodiment of the invention are beneficial to establishing a transitional two-stage regional power market, eliminating inter-provincial power barriers, better realizing reasonable dispatching of regional power and improving the economic benefit of power grid operation.
Drawings
Fig. 1 is a schematic flow chart of a clearing method for a regional power market according to an embodiment of the present invention;
FIG. 2 is a simplified flow chart of a clearing method for the regional power market according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a clearing device in a regional power market according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an apparatus for using a clearing method of a regional power market according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, a flow chart of a clearing method for a regional power market according to an embodiment of the present invention is shown, where the method includes steps S1 to S5:
s1, establishing an inter-provincial power transmission and reception plan optimization model and solving to obtain an inter-provincial power transmission and reception plan;
s2, establishing a cross-provincial power market clearing model and solving according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result;
s3, establishing an inter-provincial junctor power plan optimization model according to the inter-provincial power transmission and reception plan, and solving to obtain an inter-provincial junctor power plan;
s4, establishing an intra-provincial power market clearing model and solving according to the inter-provincial tie line power plan to obtain an intra-provincial power market clearing result;
and S5, performing regional power dispatching according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
Specifically, with each provincial power grid as a main body, an inter-provincial power transmission and reception plan optimization model is established and solved to obtain an inter-provincial power transmission and reception plan, and power transmission and coverage conditions among the provinces are obtained.
And according to the inter-provincial power transmission and reception plan, establishing a cross-provincial power market clearing model and solving to obtain a cross-provincial power market clearing result, which is to obtain the output power of the generator set of the transmitting-end province.
The inter-provincial power transmission and reception plan is obtained by establishing and solving an inter-provincial tie line power plan optimization model, and the inter-provincial power transmission and reception plan is distributed to the inter-provincial tie lines, so that the inter-provincial power transmission and reception plan can be inferred from the inter-provincial tie line power plan.
According to the inter-provincial tie line power plan, an intra-provincial electric power market clearing model is established and solved to obtain an intra-provincial electric power market clearing result, and the process is similar to a conventional electric power market clearing process and is not repeated herein.
Regional power dispatching is carried out according to the cross-provincial power market clearing result and the intra-provincial power market clearing result, so that regional power distribution is more reasonable, the distribution situation of regional energy and consumption is more met, and the economic benefit of power grid operation is improved.
To enhance the understanding of the method of the present invention, this embodiment also provides a simple flow diagram of a clearing method of the regional power market, see fig. 2 in particular.
The clearing method for the regional power market provided by the embodiment 1 of the invention is beneficial to establishing a transitional two-stage regional power market, eliminating inter-provincial power barriers, better realizing reasonable dispatching of regional power and improving the economic benefit of power grid operation.
As an improvement of the above scheme, the establishing and solving an inter-provincial power transmission and reception plan optimization model to obtain an inter-provincial power transmission and reception plan specifically includes:
simplifying the inter-provincial power grid into a single node, and establishing an inter-provincial power transmission and reception plan optimization model based on the simplified provincial power grid; the inter-provincial power transmission and reception plan optimization model takes the minimization of the variance of each intra-provincial power generation sequence as an objective function;
determining constraint conditions of the inter-provincial power transmission and reception plan optimization model according to intra-provincial power balance constraints, power transmission and reception balance constraints, power generation upper and lower limit constraints of each province, power generation climbing rate constraints of each province, outward transmission channel capacity constraints and inter-provincial daily electric quantity transaction constraints;
and solving the provincial power transmission and reception plan optimization model by using mathematical optimization software to obtain the provincial power transmission and reception plan.
Specifically, the inter-provincial power grid is simplified into a single node, and an inter-provincial power transmission and reception plan optimization model based on the simplified provincial power grid is established. The inter-provincial power grid is simplified into a single node because: on one hand, the constraint of each provincial power grid is complex, and the unified optimization model of the whole power grid is difficult to consider all constraint conditions, so that the model is easy to have no solution; on the other hand, the accuracy of the unit parameters and the network model in each regional power system is not high enough, and long-term maintenance is difficult, and the extremely large-scale data and models bring great challenges to the accuracy of unified modeling and the reliability of solution.
The inter-provincial power transmission and reception plan optimization model takes the minimization of the variance of each intra-provincial power generation sequence as an objective function, intuitively smoothes the intra-provincial power generation curve, and is expressed by a mathematical expression
Wherein, minf (P)Gi,t) As an objective function, αiA weight coefficient of a power grid optimization target for the ith province;
generating power for the ith province at a time t;
the maximum power generation capacity of the ith province.
Determining constraint conditions of an inter-provincial power transmission and reception plan optimization model according to intra-provincial power balance constraint, power transmission and reception balance constraint, power generation upper and lower limit constraint of each province, power generation climbing rate constraint of each province, outward transmission channel capacity constraint and inter-provincial daily electric quantity transaction constraint, and specifically comprising the following steps:
a) inter-provincial power balance constraints
For each provincial power grid, the provincial generated power is equal to the sum of the load and the transmitted and received power, and the following steps are carried out:
in the formula (I), the compound is shown in the specification,
the predicted values of the generated output, the transmitted and received power and the load of the ith province in the time t are respectively. S represents a set of transmitting-end provinces, and R represents a set of receiving-end provinces; t is a set of scheduling periods.
b) Transmit and receive electric balance constraint
The total output power of the transmitting-end province minus the network loss is equal to the total input power of the receiving-end province, and then
In the formula, ρjIs the network loss coefficient of the transmit province j.
c) Upper and lower limit constraints of power generation of each province
The power generation power of each province needs to be within the output range of the power generation capacity of the province, and the following steps are carried out:
in the formula (I), the compound is shown in the specification,
the minimum power generation capacity of the ith province.
d) Power generation ramp rate constraint in each province
The generated power of each province is limited by the climbing rate of the unit, and the following steps are performed:
in the formula (I), the compound is shown in the specification,
and
the downward ramp rate and the upward ramp rate for the ith province.
e) Outbound channel capability constraints
Because the transmission power of the outgoing channel is limited, the power-saving and receiving power needs to meet corresponding constraints, and then:
in the formula (I), the compound is shown in the specification,
the minimum sending (receiving) capacity and the maximum sending (receiving) capacity of the ith provincial power grid are respectively.
f) Electric quantity transaction constraint
In order to satisfy the daily electric quantity constraint of the inter-provincial transaction, the peak-valley value of the power transmission and reception curve needs to satisfy the electric quantity contract constraint, and then:
in the formula, EiNAnd trading the electric quantity agreement value for the day of the ith province, wherein the agreement value is the allowable deviation of the electric quantity.
The inter-provincial power transmission and reception plan optimization model established according to the constraint conditions and the objective function is a linear programming model, and the inter-provincial power transmission and reception plan optimization model can be solved by using mathematical optimization software to obtain an inter-provincial power transmission and reception plan. Preferably, the mathematical optimization software is GAMS, AIMMS, CPLEX.
As an improvement of the above scheme, the establishing and solving a cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result specifically includes:
according to the inter-provincial power transmission and reception plan, determining power transmission and reception power of the province of the receiving end and a power generator set of the province of the transmitting end;
establishing the cross-provincial electric power market clearing model according to the transmitting and receiving electric power of the receiving-end province and the generator set of the transmitting-end province; the cross-provincial electric power market clearing model takes the minimization of a power generation side quotation function as a target function;
determining constraint conditions of the cross-provincial electric power market clearing model according to supply and demand balance constraint of the sending-receiving province, electric power balance constraint of the sending-end province and generating capacity constraint of a generator set of the sending-end province;
and solving the cross-provincial electric power market clearing model by using mathematical optimization software to obtain a cross-provincial electric power market clearing result.
Specifically, according to the inter-provincial power transmission and reception plan, the market body and the transaction scale can be determined, namely, the power transmission and reception power of the receiving-end province and the generator set of the sending-end province are determined. In the cross-provincial electric power market, a receiving-end province is taken as a whole, a user participates in cross-provincial electric power transaction, and a sending-end province allows all generator sets in the province to participate in the cross-provincial electric power transaction. The transmitting and receiving power of the receiving province i in the time period t is obtained according to the previous step 1
The transaction size in the t period across the provincial power market is
Suppose that the sending end provinceIn j there is NjIf one generator set participates in the cross-provincial market, the total number of the generators participating in the cross-provincial power market is
In the cross-provincial electric power market, a single-side quotation mode is adopted, namely, the user side reports no quotation, and the power generation side declares a volume price curve. Establishing a cross-province power market clearing model according to the transmitting and receiving power of the receiving province and the generator set of the transmitting province; the cross-provincial electric power market clearing model takes the minimization of a power generation side quotation function as a target function and is expressed as a mathematical expression sub-expression
In the formula, pj,n(t) is the output power of the nth generator set in the sending terminal province j in the time period t, aj,n、bj,n、cj,nThe coefficient of the quadratic term, the coefficient of the primary term and the coefficient of the constant term of the quotation function of the nth generator set in the sending province j are respectively.
Determining constraint conditions of a cross-provincial electric power market clearing model according to supply and demand balance constraint of a transmitting-receiving province, electric power balance constraint of a transmitting-end province and generating capacity constraint of a generator set of the transmitting-end province, wherein the constraint conditions are as follows:
a) supply and demand balance constraints are:
b) the power balance constraint of the sending terminal province comprises the following steps:
c) the unit generating capacity constraint includes:
in the formula (I), the compound is shown in the specification, j,np、
respectively is the output lower limit and the output upper limit of the nth generator set in the sending-end province j;
the downward climbing speed and the upward climbing speed of the nth generator set in the sending terminal province j are respectively.
And solving the cross-provincial electric power market clearing model by using mathematical optimization software to obtain a cross-provincial electric power market clearing result. Preferably, the mathematical optimization software is GAMS, AIMMS, CPLEX.
As an improvement of the above scheme, establishing an inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan, and solving to obtain an inter-provincial tie line power plan specifically includes:
establishing an inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan; the inter-provincial junctor power plan optimization model takes the minimum total network loss of junctors as an objective function;
determining conventional constraints of the inter-provincial tie line power plan optimization model, which do not contain integer variables, according to maximum power deviation constraints, transmission and reception electric quantity constraints, linear tie line operation constraints and alternating tie line operation constraints;
determining constraints containing integer variables of the inter-provincial connecting line power plan optimization model according to power smooth operation constraints, non-retuning constraints in a short time and power regulation frequency constraints;
and solving the inter-provincial junctor power plan optimization model by calling a CPLEX solver to obtain an inter-provincial junctor power plan.
Specifically, an inter-provincial link power plan optimization model is established according to the inter-provincial power transmission and reception plan. After the inter-provincial power transmission and reception plan is obtained, how to distribute the power transmission and reception plan to each of the provincial interconnections is further studied, and the optimization target at this stage is to minimize the total loss of the interconnections. For two regional power grids in AC-DC hybrid connection, the sum of the power of each return connecting line can basically meet the power transmission and receiving plan because the transmission power of the AC line is allowed to be continuously adjusted. However, when all the interconnections between the two asynchronous power networks are dc lines, the characteristics of the power curves of the dc interconnections need to be considered in particular due to discrete characteristics such as the limitation of the number of times of dc power adjustment and the power curve stepping.
The inter-provincial junctor power plan optimization model takes the minimum total network loss of the junctor as an objective function. After the inter-provincial power transmission and reception plan is determined, it is necessary to distribute power to each link and to use the minimum total loss of the link as an optimization target.
For a certain area, the outgoing channel is composed of an AC line and a DC line, and assuming that AC is the subscript set of the AC line and DC is the subscript set of the DC line, the objective function is
In the formula, pDC,k(t) is the active power of the DC link k during the period t, fk(pDC,k(t)) is the network loss function of the direct current line k during the period t; p is a radical ofAC,l(t) active power of the AC line l during a time period t, fl(pAC,l(t)) is the line loss function of the ac line l during time t.
And determining the conventional constraint of the inter-provincial junctor power plan optimization model without integer variables according to the maximum power deviation constraint, the transmission and reception electric quantity constraint, the linear junctor operation constraint and the alternating junctor operation constraint. For conventional constraints without integer variables, first, consider the operating constraints of elements such as dc, power plants, local ac interconnections, etc., which may be represented by linear inequalities containing continuous variables, as follows:
a) the maximum power deviation constraint is as follows:
in the formula, PT(t) is the total outgoing power of the area during t, and Δ p is the maximum allowable power deviation, which may be set to 0.02 times the maximum total transmitted power.
b) The power transmission and reception is restricted by the electric quantity, including:
in the formula, ETThe daily exchange electric quantity plan among the areas is converted into a value after the total output is obtained; Δ E is the allowable coefficient of variation of the electrical quantity, typically 2% ET。
c) The operation constraint of the direct current tie line comprises the following steps:
in the formula (I), the compound is shown in the specification,
respectively, the maximum power limit value and the minimum power limit value of the kth return direct current.
d) The operation constraint of the exchange tie line comprises the following steps:
in the formula (I), the compound is shown in the specification,
respectively the maximum power limit value and the minimum power limit value of the first-time alternating current.
Determining constraints containing integer variables of the provincial junctor power plan optimization model according to power smooth operation constraints, non-retuning constraints in a short time and power regulation frequency constraints, which are specifically as follows:
a) power smooth running constraints are:
in the formula (I), the compound is shown in the specification,
an upper regulation rate limit value and a lower regulation rate limit value of the kth return direct current are respectively;
is an integer variable from 0 to 1;
represents the upper limit of the number of power non-stationary operation sections.
Indicating a power down adjustment for time period t +1,
indicating that the power level is not changed for a period t +1, and
or
Is 0. The time of the DC power in the non-steady process (regulation process) is generally not more than 6 hours, so that
May be provided as 24.
b) The restriction is not adjusted reversely in a short time, and the method comprises the following steps:
under the action of the above constraint conditions, the power regulating variable
No [ (1,0), (0,1) occurrence is allowed]Or [ (0,1), (1,0)]The value of (2) eliminates the condition that the direct current power is adjusted up and down in adjacent time intervals, namely, the direct current power curve is prevented from having a peak. The constraint has the advantages that the constraint is a linear inequality, a non-linear equation is avoided, and efficient solution of a model is facilitated.
C) The power regulation times constraint includes:
in the formula (I), the compound is shown in the specification,
and the integer variable is 0-1, which indicates whether the power of the kth return direct current changes from stable operation to beginning adjustment or not in the time period t, and whether the adjustment is finished or not is changed into the stable operation. N is a radical ofmaxThe number of the power stages is represented, and in actual operation, the number of stages of a direct current power curve in one day is required to be generally within 8, namely Nmax＝16。
The inter-provincial junctor power plan optimization model established according to the constraint conditions and the objective function is a mixed integer planning model, and the inter-provincial junctor power plan optimization model can be solved by calling a CPLEX solver, so that an inter-provincial junctor power plan is obtained.
As an improvement of the above scheme, establishing an provincial power market clearing model and solving the model according to the inter-provincial tie line power plan to obtain an provincial power market clearing result, specifically including:
establishing an intra-provincial electric power market clearing model according to the inter-provincial connecting line power plan; the provincial power market clearing model takes the minimum electricity purchasing cost of the province as an objective function;
determining constraint conditions of the provincial power market clearing model according to system load balance constraint, system spare capacity constraint, line safety constraint and generator set output characteristic constraint;
and solving the provincial power market clearing model by calling a CPLEX solver to obtain a provincial power market clearing result.
Specifically, an intra-provincial electric power market clearing model is established according to an inter-provincial tie line power plan; the provincial power market clearing model takes the minimum electricity purchasing cost of the province as an objective function; determining constraint conditions of a provincial power market clearing model according to system load balance constraint, system spare capacity constraint, line safety constraint and generator set output characteristic constraint; and solving the provincial power market clearing model by calling a CPLEX solver to obtain a provincial power market clearing result. The step is similar to a conventional clearing method in the electric power market, and if a certain province is taken as an example, the province comprises five common power types of thermal power, hydroelectric power, wind power, nuclear power and gas power, the clearing process is as follows:
(1) objective function
The number of coal-electric units in a certain area is assumed to be C, the number of water-electric units is assumed to be H, the number of gas-electric units is assumed to be G, the number of wind power plants is assumed to be W, and the number of nuclear power units is assumed to be Q. The objective function is that the electricity purchasing cost is minimum, and then:
in the formula, Fcoal(c,t)、Fhydro(h,t)、Fgas(g,t)、Fnuclear(n,t)、Fwind(w, t) are respectively the running expenses of a coal electric unit c, a hydroelectric unit h, a gas electric unit g, a nuclear power unit q and a wind power plant w in a time period t; ccoal(c,t)、Cgas(g,t)、Cnuclear(q, t) are respectively the starting cost of the coal electric unit c, the gas electric unit g and the nuclear power unit q in the time period t.
Taking a coal-electric unit as an example, the running cost function (namely, the quotation curve) is Fcoal(c,t)＝a2pc(c,t)2+a1pc(c,t)+a0In the formula a2、a1、a0Respectively a quadratic term coefficient, a primary term coefficient and a constant term, p, of a coal-electricity quotation curvec(c, t) is the output of the coal electric unit c in the time period t; the startup cost function satisfies the constraint:
in the formula CU(c) For the single start-up cost, U, of the coal-electric machine set ccAnd (c, t) is the starting and stopping state of the coal electric unit c in the time period t.
(2) Constraint conditions
(a) System load balancing constraints
For time period t, the load balancing constraint may be described as:
in the formula, pg(g,t)、ph(h,t)、pq(q,t)、pw(w, t) are the output of the gas-electric unit g, the hydroelectric unit h, the nuclear power unit q and the wind power plant w in the time period t respectively; t (M, T) is the power of the inter-provincial call wire M in the time period T (the received power is positive, the output power is negative), and M is the total number of the inter-provincial call wires; d (t) is the total load of the time period t.
(b) System spare capacity constraint
The total startup capacity of the controllable units (i.e. the units except for the wind power) needs to be ensured to meet the minimum spare capacity of the system, and the positive spare capacity of the system is constrained as follows:
the system negative spare capacity constraint is as follows:
in the formula of Ug(g,t)、Uh(h,t)、Uq(q, t) are respectively the starting and stopping states of the gas-electric unit g, the hydroelectric unit h and the nuclear power unit q in a time period t, wherein"1" indicates start-up and "0" indicates shutdown;
the upper output limits of the coal electric unit c, the gas electric unit g, the hydroelectric unit h and the nuclear power unit q are respectively set;
the lower limits of output of the coal electric unit c, the gas electric unit g, the hydroelectric unit h and the nuclear power unit q are respectively set; rU(t) is the positive standby requirement for time period t, RD(t) is the negative standby requirement for time period t.
(c) Line safety constraints are:
in the formula (I), the compound is shown in the specification,
is the tidal current transmission limit of the line v; gv-c、Gv-g、Gv-h、Gv-q、Gv-wRespectively are power transfer factors of a node v where a coal electric machine set c, a gas electric machine set g, a hydroelectric machine set h, a nuclear power machine set q and a wind power field w are located; gv-zPower transfer factor for node z to line v; d (Z, t) is the load of the node Z in the time period t, and Z is the total node number.
(d) Constraint of output characteristics of various generator sets
Thermal power, gas power and nuclear power
Thermal power, gas power and nuclear power need to consider upper and lower limit constraint, climbing rate constraint and minimum startup and shutdown time constraint. In the following, thermal power is taken as an example for explanation, and the output characteristic constraints of gas electricity and nuclear power are consistent with that of thermal power, which is not described in detail herein. The thermal power upper and lower limits are constrained as follows:
the climbing rate is constrained as follows:
the minimum on-off time constraints are as follows:
in the formula (I), the compound is shown in the specification,
the upward and downward climbing rates of the coal electric machine set c are respectively; t isU(c)、TD(c) Respectively the minimum continuous startup time and the minimum continuous shutdown time of the coal electric unit c.
Water and electricity
The upper and lower limits of hydropower are constrained as follows:
the climbing rate of hydropower is constrained as follows:
the daily power generation of hydropower is constrained as follows:
in the formula (I), the compound is shown in the specification,
the upward climbing speed and the downward climbing speed of the hydroelectric generating set h are respectively; q (h) is the daily generated energy limit of the hydroelectric generating set h.
③ wind power
The upper and lower limits of wind power are constrained as follows:
in the formula (I), the compound is shown in the specification,
and (4) the predicted output of the wind power plant w in the time period t.
(3) Model solution
And writing the provincial power market clearing model into general optimization modeling software, and calling a CPLEX solver to solve.
As an improvement of the above scheme, the performing regional power scheduling according to the cross-provincial power market clearing result and the intra-provincial power market clearing result specifically includes:
according to the cross-provincial electric power market clearing result, first output power and first clearing price of all generator sets of the sending-end province in all time periods are obtained;
according to the provincial electric power market clearing result, obtaining second output power and second clear electricity price of all the generator sets of each province in all time periods;
and scheduling regional power according to the first output power, the first clear electricity price, the second output power and the second clear electricity price.
Specifically, according to the cross-provincial electric power market clearing result, the first output power and the first clear price of all the generator sets of the sending-end province in all the time periods are obtained. Wherein the first clear price is based on supply and demand balance constraint
And the derived first Lagrange multiplier is further obtained by calculation.
And obtaining the second output power and the second clear price of each province generator set in all time periods according to the clear results of the provincial electric power market. Wherein the second clear price is based on the system load balance constraint
Derived second Lagrangian multiplier lambdatAnd according to line safety constraints
Derived third Lagrangian multiplier ξtlAnd a fourth Lagrange multiplier σtlSubstituted into the formula
Solving to obtain; wherein, LMPtkAnd the second price of the clear electricity is given.
And dispatching regional power according to the first output power, the first clear power price, the second output power and the second clear power price, so that the power grid more reasonably coordinates the resource and consumption distribution relationship, and the economic benefit of the power grid operation is improved.
Referring to fig. 3, which is a schematic structural diagram of a clearing device in a regional power market according to an embodiment of the present invention, the device includes:
the first model establishing module 11 is configured to establish an inter-provincial power transmission and reception plan optimization model and solve the model to obtain an inter-provincial power transmission and reception plan;
the second model establishing module 12 is configured to establish a cross-provincial power market clearing model and solve the cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result;
a third model establishing module 13, configured to establish an inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan, and solve the inter-provincial tie line power plan optimization model to obtain an inter-provincial tie line power plan;
a fourth model establishing module 14, configured to establish an intra-provincial power market clearing model according to the inter-provincial tie line power plan, and solve the intra-provincial power market clearing model to obtain an intra-provincial power market clearing result;
and the scheduling module 15 is configured to perform regional power scheduling according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
The clearing device for the regional power market provided by the embodiment of the present invention can implement all the processes of the clearing method for the regional power market described in any one of the embodiments, and the functions and technical effects of each module and unit in the device are respectively the same as those of the clearing method for the regional power market described in the embodiment and as implemented, and are not described herein again.
Referring to fig. 4, the apparatus for a clearing method using a local power market according to an embodiment of the present invention includes a processor 10, a memory 20, and a computer program stored in the memory 20 and configured to be executed by the processor 10, where the processor 10 implements the clearing method of the local power market according to any one of the above embodiments when executing the computer program.
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 20 and executed by the processor 10 to implement the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, the instruction segments being used to describe the execution of a computer program in a method for clearing a regional power market. For example, the computer program may be divided into a first model building module, a second model building module, a third model building module, a fourth model building module, and a scheduling module, each of which functions specifically as follows:
the first model establishing module 11 is configured to establish an inter-provincial power transmission and reception plan optimization model and solve the model to obtain an inter-provincial power transmission and reception plan;
the second model establishing module 12 is configured to establish a cross-provincial power market clearing model and solve the cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result;
a third model establishing module 13, configured to establish an inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan, and solve the inter-provincial tie line power plan optimization model to obtain an inter-provincial tie line power plan;
a fourth model establishing module 14, configured to establish an intra-provincial power market clearing model according to the inter-provincial tie line power plan, and solve the intra-provincial power market clearing model to obtain an intra-provincial power market clearing result;
and the scheduling module 15 is configured to perform regional power scheduling according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
The device using the clearing method of the regional power market can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The device using the method of clearing the regional power market can include, but is not limited to, a processor, a memory. It will be understood by those skilled in the art that the schematic diagram 4 is merely an example of an apparatus using the method of clearing a regional power market, and does not constitute a limitation on the apparatus using the method of clearing a regional power market, and may include more or less components than those shown, or combine some components, or different components, for example, the apparatus using the method of clearing a regional power market may further include an input-output device, a network access device, a bus, etc.
The Processor 10 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor 10 may be any conventional processor or the like, the processor 10 being the control center of the apparatus using the method of closeout for the regional power market, the various parts of the apparatus using the method of closeout for the regional power market being connected by various interfaces and lines.
The memory 20 may be used to store the computer programs and/or modules, and the processor 10 implements various functions of the apparatus using the method for clearing a regional power market by running or executing the computer programs and/or modules stored in the memory 20 and calling data stored in the memory 20. The memory 20 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to program use, and the like. In addition, the memory 20 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein the device integrated module using the method for clearing a regional power market, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium and can implement the steps of the embodiments of the method when the computer program is executed by a processor. The computer program includes computer program code, and the computer program code may be in a source code form, an object code form, an executable file or some intermediate form. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the clearing method of the regional power market according to any one of the above embodiments.
In summary, the clearing method, device and storage medium for the regional power market provided by the embodiment of the invention are beneficial to establishing a transitional two-stage regional power market, eliminating inter-provincial power barriers, better realizing reasonable dispatching of regional power, improving economic benefits of power grid operation and providing technical support for the construction of the regional power market in China.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A clearing method for a regional power market is characterized by comprising the following steps:
establishing an inter-provincial power transmission and reception plan optimization model and solving to obtain an inter-provincial power transmission and reception plan;
according to the inter-provincial power transmission and reception plan, establishing a cross-provincial power market clearing model and solving to obtain a cross-provincial power market clearing result;
establishing an inter-provincial junctor power plan optimization model and solving according to the inter-provincial power transmission and reception plan to obtain an inter-provincial junctor power plan;
according to the inter-provincial connecting line power plan, establishing an intra-provincial power market clearing model and solving to obtain an intra-provincial power market clearing result;
and carrying out regional power dispatching according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
2. The method according to claim 1, wherein the establishing an inter-provincial power transmission and reception plan optimization model and solving the model to obtain an inter-provincial power transmission and reception plan comprises:
simplifying the inter-provincial power grid into a single node, and establishing an inter-provincial power transmission and reception plan optimization model based on the simplified provincial power grid; the inter-provincial power transmission and reception plan optimization model takes the minimization of the variance of each intra-provincial power generation sequence as an objective function;
determining constraint conditions of the inter-provincial power transmission and reception plan optimization model according to intra-provincial power balance constraints, power transmission and reception balance constraints, power generation upper and lower limit constraints of each province, power generation climbing rate constraints of each province, outward transmission channel capacity constraints and inter-provincial daily electric quantity transaction constraints;
and solving the provincial power transmission and reception plan optimization model by using mathematical optimization software to obtain the provincial power transmission and reception plan.
3. The method according to claim 1, wherein the step of establishing a cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan and solving the cross-provincial power market clearing model to obtain a cross-provincial power market clearing result comprises:
according to the inter-provincial power transmission and reception plan, determining power transmission and reception power of the province of the receiving end and a power generator set of the province of the transmitting end;
establishing the cross-provincial electric power market clearing model according to the transmitting and receiving electric power of the receiving-end province and the generator set of the transmitting-end province; the cross-provincial electric power market clearing model takes the minimization of a power generation side quotation function as a target function;
determining constraint conditions of the cross-provincial electric power market clearing model according to supply and demand balance constraint of the sending-receiving province, electric power balance constraint of the sending-end province and generating capacity constraint of a generator set of the sending-end province;
and solving the cross-provincial electric power market clearing model by using mathematical optimization software to obtain a cross-provincial electric power market clearing result.
4. The method according to claim 1, wherein the establishing an inter-provincial link power plan optimization model according to the inter-provincial power transmission and reception plan and solving the inter-provincial link power plan optimization model to obtain the inter-provincial link power plan specifically comprises:
establishing an inter-provincial tie line power plan optimization model according to the inter-provincial power transmission and reception plan; the inter-provincial junctor power plan optimization model takes the minimum total network loss of junctors as an objective function;
determining conventional constraints of the inter-provincial tie line power plan optimization model, which do not contain integer variables, according to maximum power deviation constraints, transmission and reception electric quantity constraints, linear tie line operation constraints and alternating tie line operation constraints;
determining constraints containing integer variables of the inter-provincial tie line power plan optimization model according to power smooth operation constraints, non-retuning constraints in a short time and power regulation frequency constraints;
and solving the inter-provincial junctor power plan optimization model by calling a CPLEX solver to obtain an inter-provincial junctor power plan.
5. The method according to claim 1, wherein the establishing and solving an intra-provincial power market clearing model according to the inter-provincial tie line power plan to obtain an intra-provincial power market clearing result specifically comprises:
establishing an intra-provincial electric power market clearing model according to the inter-provincial connecting line power plan; the provincial power market clearing model takes the minimum electricity purchasing cost of the province as an objective function;
determining constraint conditions of the provincial power market clearing model according to system load balance constraint, system spare capacity constraint, line safety constraint and generator set output characteristic constraint;
and solving the provincial power market clearing model by calling a CPLEX solver to obtain a provincial power market clearing result.
6. The method according to claim 1, wherein the performing regional power scheduling according to the inter-provincial power market clearing result and the intra-provincial power market clearing result specifically comprises:
according to the cross-provincial electric power market clearing result, first output power and first clearing price of all generator sets of the sending-end province in all time periods are obtained;
according to the provincial electric power market clearing result, obtaining second output power and second clear electricity price of all the generator sets of each province in all time periods;
and scheduling regional power according to the first output power, the first clear electricity price, the second output power and the second clear electricity price.
7. A closeout device for a regional power market, comprising:
the first model establishing module is used for establishing an inter-provincial power transmission and reception plan optimization model and solving the inter-provincial power transmission and reception plan to obtain an inter-provincial power transmission and reception plan;
the second model establishing module is used for establishing a cross-provincial power market clearing model and solving the cross-provincial power market clearing model according to the inter-provincial power transmission and reception plan to obtain a cross-provincial power market clearing result;
the third model establishing module is used for establishing an inter-provincial junctor power plan optimization model and solving the inter-provincial junctor power plan according to the inter-provincial power transmission and reception plan to obtain an inter-provincial junctor power plan;
the fourth model establishing module is used for establishing an provincial power market clearing model and solving the provincial power market clearing model according to the power plan of the inter-provincial connecting line to obtain an provincial power market clearing result;
and the scheduling module is used for performing regional power scheduling according to the cross-provincial power market clearing result and the intra-provincial power market clearing result.
8. An apparatus using a method of clearing a regional power market, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the method of clearing a regional power market as claimed in any one of claims 1 to 6 when executing the computer program.
9. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for clearing a regional power market of any of claims 1 to 6.
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| CN115936365B (en) * | 2022-12-07 | 2024-03-26 | 中国南方电网有限责任公司 | Regional power spot market clearing method and device with multi-terminal direct-current tie line power optimization |
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