CN116342162A - Loose coupling clearing and pricing method for power system considering power transmission fee - Google Patents

Loose coupling clearing and pricing method for power system considering power transmission fee Download PDF

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CN116342162A
CN116342162A CN202310334899.XA CN202310334899A CN116342162A CN 116342162 A CN116342162 A CN 116342162A CN 202310334899 A CN202310334899 A CN 202310334899A CN 116342162 A CN116342162 A CN 116342162A
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凌晓波
王治华
胡友琳
陈宏福
冯凯
冯树海
曾丹
陈熠
王高琴
刘子杰
程千冉
王晗
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanghai Electric Power Co Ltd
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Abstract

According to quotation curves of generators and loads in each region and a corresponding power system network model, an inter-region market clearing model taking the maximized social benefit of a transmitting region as an objective function and an intra-region market clearing model taking the maximized social benefit of a receiving region as an objective function are constructed under the condition of considering various forms of power transmission fees; iteratively solving the inter-area market clearing model and the intra-area market clearing model in a mode of transmitting inter-area electricity purchasing price and inter-area electricity purchasing demand to obtain winning results of all the area generators and loads, further solving an inter-area market pricing model and an intra-area market pricing model, and pricing all the generators and loads based on node electricity prices; and finally, obtaining market clearing results and pricing results of all the generators and loads. The invention can consider various forms of power transmission fees in the inter-regional power market clearing model, improves the utilization rate of power resources, ensures the rationality and fairness of a pricing mechanism, adapts to the coexistence situation of various forms of power transmission fees, and ensures the rationality and fairness of power market pricing while improving the utilization rate of power resources.

Description

Loose coupling clearing and pricing method for power system considering power transmission fee
Technical Field
The invention relates to a technology in the field of power control, in particular to a loose coupling clearing and pricing method for a power system for accounting power transmission fees.
Background
With the continuous advancement of the reform of the electric power market, the importance of the inter-provincial electric power market in promoting the mutual economy of the inter-provincial electric power resource and realizing the nationwide electric power resource optimization configuration is increasingly prominent. At present, the inter-provincial power market and the intra-provincial power market in China are in a layered clearing stage, namely the inter-provincial power market is cleared preferentially, and the inter-provincial clearing result is used as a boundary of intra-provincial power transaction and is cleared again. The inter-provincial and intra-provincial power market trading system and the clearing mode of the layering clearing stage are easy to implement, but because the inter-provincial power market and the intra-provincial power market are cleared sequentially and completely decoupled, the nationwide power resources cannot be utilized to the maximum extent.
In order to improve the utilization rate of the electric power resources, the electric power market in China can gradually change from a layered clearing stage to a loose coupling clearing stage, and the coupling degree of the inter-provincial electric power market and the intra-provincial electric power market is enhanced. In the loose coupling clearing stage, clearing results of the inter-provincial power market and the intra-provincial power market can be mutually influenced, cross-region electricity purchasing price obtained by clearing of the inter-provincial power market can influence clearing of the inter-provincial power market, and cross-region electricity purchasing power obtained by clearing of the intra-provincial power market can influence clearing of the inter-provincial power market, so that the inter-provincial power market and the intra-provincial power market need to be coordinated, optimized and iterated to clear, and when the iterated results tend to converge, the optimal inter-provincial power market clearing result is obtained. Compared with the layering clearing stage, the loose coupling clearing stage can continuously optimally adjust the cross-region electricity purchasing power in the iteration process of clearing the inter-provincial-intra-provincial electricity market, so that the electricity resource utilization rate can be further improved.
In addition, in order to recover the transmission cost, the power market is clear and needs to further consider the transmission cost. According to the power grid structure of China, the power transmission lines can be divided into a trans-regional direct current power transmission line, a trans-regional inter-provincial alternating current power transmission line and an intra-provincial alternating current power transmission line, wherein the trans-regional direct current power transmission line and the trans-regional inter-provincial alternating current power transmission line charge the power transmission fee according to the actual power flow of the lines, and the intra-provincial alternating current power transmission line charges the power transmission fee according to the load power consumption. After various forms of power transmission fees are counted, the clearing model of the inter-provincial and intra-provincial power market can be changed, the clearing result can be influenced, and the pricing mode after loose coupling iteration clearing is not clear.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a loose coupling clearing and pricing method for a power system for accounting for power transmission fees, which can consider various forms of power transmission fees in an inter-regional power market clearing model, improve the utilization rate of power resources, ensure the rationality and fairness of a pricing mechanism and adapt to the coexistence situation of various forms of power transmission fees, and ensure the rationality and fairness of power market pricing while improving the utilization rate of power resources.
The invention is realized by the following technical scheme:
the invention relates to a loose coupling clearing and pricing method of an electric power system, which comprises the steps of constructing an inter-area market clearing model taking the maximized social benefit of a transmitting area as an objective function and an intra-area market clearing model taking the maximized social benefit of a receiving area as an objective function according to quotation curves of generators and loads in all areas and corresponding electric power system network models under the condition of considering various power transmission fees; iteratively solving the inter-area market clearing model and the intra-area market clearing model in a mode of transmitting inter-area electricity purchasing price and inter-area electricity purchasing demand to obtain winning results of all the area generators and loads, further solving an inter-area market pricing model and an intra-area market pricing model, and pricing all the generators and loads based on node electricity prices; and finally, obtaining market clearing results and pricing results of all the generators and loads.
The social benefit means that: the sum of consumer and producer residuals in the power market.
The electric power system network model comprises: the sensitivity of the inter-regional direct current tie line, the inter-regional alternating current tie line, the inter-regional easy-to-block alternating current line, the node information of each generator set, the node information of each load node, the drop point information of the inter-regional direct current tie line, the node of each generator set, each load node and the drop point of the inter-regional direct current tie line to the inter-regional alternating current tie line and the inter-regional easy-to-block alternating current line.
The various forms of power transmission fees include: the method comprises the steps of cross-region direct current power transmission fee, cross-region alternating current power transmission fee and region alternating current power transmission fee, wherein: the trans-regional direct current transmission line and the trans-regional alternating current transmission line collect the power transmission fee according to the actual power flow of the line, and the regional alternating current transmission line collects the power transmission fee according to the load power consumption.
The iterative solution specifically comprises the following steps: the inter-area market clearing model is optimized and solved under the condition of the inter-area electricity purchasing demand, and after the solution is finished, the node electricity price of the trans-regional direct current tie line at the sending end drop point is calculated, and the node electricity price is the inter-area electricity purchasing price and is used as a parameter to be transmitted into the intra-area market clearing model; and carrying out optimization solution on the regional market clearing model under the condition of the inter-regional electricity purchase price, and obtaining the transmission electric quantity of the cross-regional direct current tie after the solution is completed, wherein the electric quantity is the inter-regional electricity purchase demand and is used as a parameter to be transmitted into the inter-regional market clearing model.
And carrying out iterative solution, and ending the iteration when the difference between the current iteration result and the previous iteration result is smaller than a set value.
The inter-regional market pricing model refers to: and solving a model of the power generator and the load pricing of the transmitting end region based on the clearing result of the inter-region market clearing model.
The regional market pricing model refers to: and solving a model of the power generator and the load pricing of the receiving end region based on the clearing result of the market clearing model in the region.
The concrete method for calculating the pricing results of each generator and load by adopting the node electricity price method comprises the following steps: according to the final result of iteration clearing, the electric quantity is transmitted by a fixed cross-region direct current tie line, scalar in the load of a transmitting end region is fixed, a market pricing model between regions is solved by taking the minimized generating cost of the transmitting end as an objective function, the transmitting end generator is priced according to the node electricity price of the node where the transmitting end generator is located, and the load of the transmitting end is priced according to the node electricity price superposition of the node where the transmitting end generator is located and the electricity price in the transmitting end region; and (3) fixing a scalar in the load of the receiving end, solving a market pricing model in the area by taking the minimized generating cost of the receiving end as an objective function, pricing the receiving end generator by using the node electricity price of the node where the receiving end generator is positioned, and pricing the receiving end load by overlapping the node electricity price of the node where the receiving end load is positioned and the power transmission price in the receiving end area.
Technical effects
According to the method, the inter-area market clearing model and the intra-area market clearing model are iteratively solved in a mode of transmitting the inter-area electricity purchasing price and the inter-area electricity purchasing demand, and the inter-area market pricing model is used for pricing the generator and the load based on the node electricity price after linearization due to the fact that the absolute value is introduced after the power transmission fee is considered. Compared with the prior art, the invention can consider various types of power transmission fees in the clearing model, is suitable for the structural characteristics of the power grid in China, and compared with layered clearing, the loose coupling iterative clearing can further improve the overall social benefit, promote the mutual economy of power resource deficiency among areas and improve the power resource utilization rate, and the pricing mechanism based on the node electricity price can meet the requirements of pricing rationality and fairness of the power market, so that the benefits of market members are effectively ensured.
Drawings
FIG. 1 is a flow chart of an embodiment;
FIG. 2 is a block diagram of a system according to the present invention;
FIG. 3 is a schematic diagram of an example model at a loose coupling stage in an embodiment;
FIG. 4 is a graph of typical daily load during the loose coupling phase of the example;
FIG. 5 is a graph of transmission power of a transmission power line of a receiving end cross-region DC link in a loose coupling stage in an embodiment;
fig. 6 is a node electricity price diagram of the C-province and the D-province at 11h in the receiving region under the loose coupling stage in the embodiment.
Detailed Description
As shown in FIG. 1, this embodiment relates to a loose coupling clearing and pricing method for an electric power system for accounting for electric power transmission fees, which has
The body comprises:
step S1: and (5) inputting quotation curves of the generators and the loads of each province and a network model of the power system.
In particular, the quotation curve for each province generator and load can be obtained from the power trading center and input into the system; the power system network model includes: the sensitivity of the inter-regional direct current tie line, the inter-regional alternating current tie line, the inter-regional alternating current tie line which is easy to block, the node information of each generator set, the node information of each load node, the drop point information of the inter-regional direct current tie line, the node of each generator set, each load node and the drop point of the inter-regional direct current tie line to the inter-regional alternating current tie line and the inter-regional alternating current tie line which is easy to block.
The power system network model is already present after the construction of the power system, and can be obtained from the power system dispatching or transaction facility and input into the system.
Step S2: and constructing an inter-provincial market clearing model taking the maximized sending-end provincial social benefit as an objective function, constructing an intra-provincial market clearing model taking the maximized receiving-end provincial social benefit as an objective function, and considering various types of power transmission fees in the clearing model.
The objective function of the provincial market clearing model is that the maximum sending end provincial social welfare:
Figure BDA0004156085450000031
constraint conditions of the provincial market clearing model are as follows:
Figure BDA0004156085450000041
wherein: t is a clearing period set; j (J) se The method is a sending end province collection; />
Figure BDA0004156085450000042
A load set saved for the sending end j; />
Figure BDA0004156085450000043
A quotation segment set for saving the load l for the sending end j; />
Figure BDA0004156085450000044
A generator set saved for a sending end j; />
Figure BDA0004156085450000045
A quotation segment set for the power generator g of the power transmitting end j; s is a cross-region interconnecting line set between the sending end and the receiving end; k (K) se A cross-province alternating current line set in the transmitting area; k (K) se,in A line set in a sending end province; />
Figure BDA0004156085450000046
And->
Figure BDA0004156085450000047
Respectively a medium scalar and quotation of the sending end load; />
Figure BDA0004156085450000048
And->
Figure BDA0004156085450000049
Respectively a medium scalar and quotation of the sending-end generator; b (B) j The intra-provincial power transmission price for the provincial power transmission terminal j; b (B) j The power transmission fee in the province for the power transmission end j province;
Figure BDA00041560854500000410
and->
Figure BDA00041560854500000411
Respectively representing the tide and the power transmission price of the trans-provincial alternating current line in the transmitting end area; />
Figure BDA00041560854500000412
And->
Figure BDA00041560854500000413
The upper limit of the sending end generator and the load in the respective quotation section are respectively set; />
Figure BDA00041560854500000414
And->
Figure BDA00041560854500000415
Minimum and maximum of power generator g for the power transmitting end j respectivelyA climbing rate; q (Q) s,t The transmission power of the cross-zone interconnecting line s in the period t; />
Figure BDA00041560854500000416
Respectively is a terminal-feeding generator,
Load flow transfer factors of the load and the transregional direct current tie line drop points to the sending end alternating current line k;
Figure BDA00041560854500000417
and->
Figure BDA00041560854500000418
Respectively the minimum and maximum power flow limit values of the transmission end alternating current circuit k; />
Figure BDA00041560854500000422
The dual variables are the power balance constraint of the transmitting end; />
Figure BDA00041560854500000419
And
Figure BDA00041560854500000420
is a dual variable of the flow constraint of the alternating current line at the transmitting end.
The objective function of the provincial market clearing model is that the social welfare of the provincial part at the receiving end is maximized:
Figure BDA00041560854500000421
constraint conditions of the provincial market clearing model are as follows:
Figure BDA0004156085450000051
wherein: i re The method is a province collection of a receiving end;
Figure BDA0004156085450000052
a load set saved for a receiving end i; />
Figure BDA0004156085450000053
A quotation segment set for saving load l for a receiving end i; />
Figure BDA0004156085450000054
A generator set saved for a receiving end i; />
Figure BDA0004156085450000055
A quotation segment set of the generator g is saved for the receiving end i; k (K) re
A cross-province alternating current line set in the receiving end area; k (K) re,in Is a collection of lines in a receiving end province;
Figure BDA0004156085450000056
and->
Figure BDA0004156085450000057
Respectively a medium scalar and quotation of the receiving end load; />
Figure BDA0004156085450000058
And->
Figure BDA0004156085450000059
Respectively a medium scalar and quotation of the receiving-end generator; b (B) i The power transmission price in the province of the receiving end i province; />
Figure BDA00041560854500000510
The purchase price of the cross-region connecting line s at the receiving end drop point is the time period t; b (B) s T The transmission price of the cross-region interconnecting line s;
Figure BDA00041560854500000511
and->
Figure BDA00041560854500000512
Respectively representing the tide and the power transmission price of the cross-province alternating current line in the receiving area; />
Figure BDA00041560854500000513
And->
Figure BDA00041560854500000514
The upper limit of the receiving end generator and the load in the respective quotation section are respectively set; />
Figure BDA00041560854500000515
And->
Figure BDA00041560854500000516
The minimum and maximum climbing rates of the power generator g are respectively calculated by the receiving end i; zeta type toy s The transmission loss coefficient of the cross-region direct current interconnection line s; />
Figure BDA00041560854500000517
The load flow transfer factors of the receiving-end generator, the load and the cross-region tie line drop point pair receiving-end alternating current line k are respectively; />
Figure BDA00041560854500000518
The upper limit of transmission power of the cross-region direct current interconnecting line s; />
Figure BDA00041560854500000519
And->
Figure BDA00041560854500000520
The minimum and maximum climbing rate of the cross-region direct current tie s; />
Figure BDA00041560854500000525
Is a dual variable constrained by the power balance of the receiver; />
Figure BDA00041560854500000521
And->
Figure BDA00041560854500000522
Is a dual variable constrained by the end alternating current line power flow.
Alternating current line power transmission fee of cross-province in objective function
Figure BDA00041560854500000523
And->
Figure BDA00041560854500000524
) There is an absolute value, and to eliminate the nonlinearity caused by the absolute value term, the objective function is linearized by introducing auxiliary variables and constraints:
specifically, the auxiliary variables are:
Figure BDA0004156085450000061
specifically, the auxiliary constraints are:
Figure BDA0004156085450000062
wherein:
Figure BDA0004156085450000063
as a dual variable of the auxiliary constraint of the transmitting end; />
Figure BDA0004156085450000064
Is a dual variable constrained by end-assist.
One alternative to the ac line power transmission fee in the objective function is to:
Figure BDA0004156085450000065
step S3: the inter-provincial market clearing model is optimized and solved under the condition of given inter-provincial electricity purchasing demand, and after solving, the node electricity price of the trans-regional direct current tie line at the sending end drop point is calculated, wherein the price is the inter-provincial electricity purchasing price and is transmitted into the inter-provincial market clearing model as a parameter; and carrying out optimization solution on the provincial inter-provincial market clearing model under the condition of the given provincial inter-provincial electricity purchase price, and obtaining the transmission electric quantity of the cross-region direct current tie line after the solution is completed, wherein the electric quantity is the inter-provincial electricity purchase demand and is used as a parameter to be transmitted into the provincial inter-provincial market clearing model. The inter-province market and the intra-province market iterate out clearly in a mode of transmitting the inter-province electricity purchase price and the inter-province electricity purchase demand, and when the difference between the current iteration result and the previous iteration result is smaller than a set value, the iteration is ended.
Step S4: after the iteration clear is finished, solving an inter-provincial market pricing model and an intra-provincial market pricing model, and calculating pricing results of each generator and load by adopting a node electricity price method.
The inter-provincial market pricing model is used for fixing scalar in the trans-regional direct current tie line transmission electric quantity and the sending end load, and the objective function is to minimize the sending end power generation cost:
Figure BDA0004156085450000066
the constraint of the inter-provincial market pricing model is the same as the constraint of the inter-provincial market clearing model.
Based on the node electricity price, the electricity price of the sending end generator at the node f is as follows:
Figure BDA0004156085450000067
and the sending end load pricing is superimposed with the corresponding intra-provincial power transmission price on the basis of the power price of the generator node:
Figure BDA0004156085450000071
the intra-provincial market pricing model is used for fixing scalar quantity in the trans-regional direct current tie line transmission electric quantity and the receiving end load, and the objective function is to minimize the receiving end power generation cost:
Figure BDA0004156085450000072
the constraints of the in-province market pricing model are the same as those of the in-province market clearing model.
Based on the node electricity price, the electricity price of the receiving-end generator at the node f is as follows:
Figure BDA0004156085450000073
the receiving end load pricing is based on the electricity price of the generator node, and corresponding intra-provincial electricity transmission prices are superimposed:
Figure BDA0004156085450000074
step S5: and outputting the final market clearing result of each province and the pricing result of each generator and load, and publishing the final market clearing result to all market members in the electric power trading center.
As shown in fig. 2, a loose coupling clearing and pricing system for a power system for accounting for power transmission fees according to the present embodiment includes: input module, clear module, iteration module, pricing module and output module, wherein: the input module collects quotation curve information of the generators and the loads in each area and outputs the quotation curve information to the clearing module; the clearing module optimizes and solves the inter-regional market clearing model by taking the maximized social benefit of the transmitting end region as an objective function and the maximized social benefit of the receiving end region as the objective function according to the constructed inter-regional market clearing model and the intra-regional market clearing model which take the power transmission rate into consideration, so as to obtain an inter-regional power clearing result and an intra-regional power clearing result; the iteration module is used for triggering the clearing module in an iteration mode until the absolute value of the difference between the current clearing result and the previous clearing result is smaller than a preset threshold value or reaches the preset iteration times, and a final inter-area power clearing result and an intra-area power clearing result are obtained; the pricing module is used for fixing scalar quantities in the trans-regional direct current tie line transmission electric quantity, the sending end load and the receiving end load according to the final inter-regional power clearing result and the regional power clearing result, solving an inter-regional market pricing model and an regional market pricing model, and pricing each generator and load by adopting a node electricity price method; the output module outputs a final inter-zone power result, an intra-zone power result, and pricing results for each generator and load.
Through specific practical experiments, an example model is constructed on the basis of an IEEE-39 node system and an IEEE-118 node system as shown in FIG. 3: 2 sending end provinces and 2 receiving end provinces are constructed, wherein an IEEE 39 node system is adopted by a sending end province A, a sending end province B and a receiving end province D, an IEEE 118 node system is adopted by a receiving end province C, the sending end province and the receiving end are connected through a trans-regional direct current connecting line, the provinces in the sending end region and the receiving end region are connected through a trans-province alternating current connecting line, and parameters of the provinces are shown in table 1. The transmission loss is considered by the direct current interconnection lines, the transmission loss of the 3 direct current interconnection lines is respectively 7%, 7.5% and 6.5%, and the transmission loss is not considered by the alternating current interconnection lines. The power transmission prices in the provinces of the transmitting end A, B are 100 yuan/MW.h and 105 yuan/MW.h respectively, and the power transmission prices in the provinces of the receiving end C, D are 150 yuan/MW.h and 140 yuan/MW.h respectively. The maximum daily load is declared according to the proportion of the typical daily load curve, as shown in fig. 4.
TABLE 1 Cross-zone and Cross-province tie parameters
Figure BDA0004156085450000081
And (3) inputting quotation curves of the generators and the loads of each province and a constructed network model in an input module, and then explaining and executing computer instructions in a clearing module and an iteration module by a processor to realize iteration clearing of inter-province power markets and intra-province power markets in a loose coupling stage. In addition, the clear result of the inter-provincial-intra-provincial power market in the layering stage is also provided to compare the advantages of the inter-provincial-intra-provincial power market in the loose coupling stage. The social benefit of the electric power market in the layering stage is 27028061 yuan, the social benefit of the electric power market in the loose coupling stage is 30543641 yuan, and the winning results of specific generators and loads are shown in table 2. According to the table, the inter-provincial power market in the loose coupling stage promotes more generators with lower sending end quotations to be in contact with loads with higher receiving end quotations, so that the inter-provincial power resource deficiency is better realized, the utilization efficiency of power resources is improved, and the overall social benefit is greatly improved.
TABLE 2 Power market clearing results for layering stage and loosely coupled stage
Figure BDA0004156085450000082
Figure BDA0004156085450000091
The total electric quantity of the trans-regional power transmission in the loose coupling stage is 52851MW & h, and the transmission power of each trans-regional direct current interconnection line is shown in figure 5. From the figure, the tie line s can be seen 2 The transmission power of (2) is minimized because of the tie line s 2 And the transmission cost is high and the transmission loss is large, and the inter-provincial market can preferentially select the connecting line with lower transmission loss coefficient and transmission cost.
Further, based on the iterative clearing results, the processor interprets and executes computer instructions in the pricing module, solves the inter-provincial market pricing model and the intra-provincial market pricing model, and calculates pricing results of each generator and load by means of node electricity prices. Fig. 6 shows the electricity prices of nodes of the receiving ends C and D at the load peak (11 h), and it can be seen from the figure that the electricity prices of the nodes are different due to consideration of the power transmission fee of the inter-provincial ac link in the area, wherein: the electricity price of each node in the D province is relatively close, and the sensitivity of each node in the D province to the cross-province alternating-current connecting lines in the 3 areas is relatively close, so that the influence degree of auxiliary constraint price components of the power transmission fees of the cross-province alternating-current connecting lines in the areas in the node electricity price on each node in the D province is similar. The reason why the electricity prices of the C-save nodes 1 to 71 are closer is also the same. The electricity price from node 72 to node 112 is continuously decreasing in the province C, because the corresponding node pairs ac tie k increase with the node number 3 Is negative and gradually smaller. The reason why the electricity prices of the C-province nodes 113-118 rise suddenly is that these nodes pair the ac link k 4 The power flow transfer factor of (2) is changed from a negative value to a positive value. Base groupThe pricing mechanism of the node electricity price comprises the electricity transmission fee in the electricity price, so that unfair phenomenon caused by the allocation of the electricity transmission fee is avoided, the rationality and fairness of pricing are effectively ensured, and the benefits of market members are effectively ensured.
Finally, the processor interprets and executes the computer instructions in the output module to output the final market clearing results for each province, and pricing results for each generator and load.
Compared with the prior art, the method can consider various types of power transmission fees in the clearing model, is suitable for the structural characteristics of the power grid in China, and compared with layered clearing, loose coupling iterative clearing can further improve the overall social benefit, is beneficial to breaking inter-province power trade barriers, pushing inter-province power resource advantage complementation and improving the power resource utilization rate, and a pricing mechanism based on node electricity price can meet the requirements of pricing rationality and fairness of the power market and can effectively guarantee benefits of market members.
The foregoing embodiments may be partially modified in numerous ways by those skilled in the art without departing from the principles and spirit of the invention, the scope of which is defined in the claims and not by the foregoing embodiments, and all such implementations are within the scope of the invention.

Claims (9)

1. A method for loosely coupled clearing and pricing of an electrical power system, comprising:
according to quotation curves of the generators and the loads in each area and a corresponding power system network model, constructing an inter-area market clearing model taking the maximized social benefit of the transmitting area as an objective function and an intra-area market clearing model taking the maximized social benefit of the receiving area as an objective function under the condition of considering various power transmission fees;
iteratively solving the inter-area market clearing model and the intra-area market clearing model in a mode of transmitting inter-area electricity purchasing price and inter-area electricity purchasing demand to obtain the winning results of all the area generators and loads, further solving the inter-area market pricing model and the intra-area market pricing model, pricing all the generators and loads based on node electricity price, and obtaining the market clearing results and pricing results of all the generators and loads;
the electric power system network model comprises: the sensitivity of the inter-regional direct current tie line, the inter-regional alternating current tie line, the inter-regional easy-to-block alternating current line, the node information of each generator set, the node information of each load node, the drop point information of the inter-regional direct current tie line, the node of each generator set, each load node and the drop point of the inter-regional direct current tie line to the inter-regional alternating current tie line and the inter-regional easy-to-block alternating current line.
2. The power system loose coupling clearing and pricing method according to claim 1, wherein the iterative solution is specifically: the inter-area market clearing model is optimized and solved under the condition of the inter-area electricity purchasing demand, and after the solution is finished, the node electricity price of the trans-regional direct current tie line at the sending end drop point is calculated, and the node electricity price is the inter-area electricity purchasing price and is used as a parameter to be transmitted into the intra-area market clearing model; and carrying out optimization solution on the regional market clearing model under the condition of the inter-regional electricity purchase price, and obtaining the transmission electric quantity of the cross-regional direct current tie after the solution is completed, wherein the electric quantity is the inter-regional electricity purchase demand and is used as a parameter to be transmitted into the inter-regional market clearing model.
3. The method for loosely coupled clearing and pricing of power system of claim 1, wherein the inter-regional market pricing model is: solving a model of a sending end regional generator and load pricing based on a clearing result of an inter-regional market clearing model;
the regional market pricing model refers to: and solving a model of the power generator and the load pricing of the receiving end region based on the clearing result of the market clearing model in the region.
4. The loose coupling clearing and pricing method for the power system according to claim 1, wherein the specific method for calculating the pricing result of each generator and load by adopting the method of node electricity price is as follows: according to the final result of iteration clearing, the electric quantity is transmitted by a fixed cross-region direct current tie line, scalar in the load of a transmitting end region is fixed, a market pricing model between regions is solved by taking the minimized generating cost of the transmitting end as an objective function, the transmitting end generator is priced according to the node electricity price of the node where the transmitting end generator is located, and the load of the transmitting end is priced according to the node electricity price superposition of the node where the transmitting end generator is located and the electricity price in the transmitting end region; and (3) fixing a scalar in the load of the receiving end, solving a market pricing model in the area by taking the minimized generating cost of the receiving end as an objective function, pricing the receiving end generator by using the node electricity price of the node where the receiving end generator is positioned, and pricing the receiving end load by overlapping the node electricity price of the node where the receiving end load is positioned and the power transmission price in the receiving end area.
5. The method for loosely coupled output and pricing of power system of claim 1, wherein the quotation curves and corresponding power system network models according to the generator and load of each region are: quotation curves for the generators and loads in each region can be obtained from the power trading center and input into the system; the power system network model includes: the sensitivity of the inter-regional direct current tie line, the inter-regional alternating current tie line, the inter-regional alternating current tie line which is easy to block in the region, the node information of each generator set, the node information of each load node, the drop point information of the inter-regional direct current tie line, the node of each generator set, each load node and the drop point of the inter-regional direct current tie line to the inter-regional alternating current tie line and the inter-regional alternating current tie line which is easy to block in the region; the power system network model is already present after the construction of the power system, and can be obtained from the power system dispatching or transaction facility and input into the system.
6. The method for loosely coupled output and pricing of power system of claim 1, wherein the constructing an inter-zone market output model that maximizes a delivery zone social benefit as a function of interest means: constructing an inter-region market clearing model taking maximized social benefits of a transmitting region as an objective function, constructing an intra-region market clearing model taking maximized social benefits of a receiving region as an objective function, and considering various forms of power transmission fees in the clearing model;
the inter-regional market clearing model specifically comprises the following steps:
Figure FDA0004156085440000021
constraint conditions of the inter-regional market clearing model are as follows:
Figure FDA0004156085440000022
Figure FDA0004156085440000023
Figure FDA0004156085440000024
Figure FDA0004156085440000025
Figure FDA0004156085440000026
Figure FDA0004156085440000027
，
wherein: t is a clearing period set; jse is a set of delivery regions;
Figure FDA0004156085440000028
a load set saved for the sending end j; />
Figure FDA0004156085440000029
A quotation segment set for saving the load l for the sending end j; />
Figure FDA0004156085440000031
A generator set saved for a sending end j; />
Figure FDA0004156085440000032
A quotation segment set for the power generator g of the power transmitting end j; s is a cross-region interconnecting line set between the sending end and the receiving end; kse is a cross-province alternating current line set in the transmitting end area; kse, in is the line set in the transmitting area; />
Figure FDA0004156085440000033
And->
Figure FDA0004156085440000034
Respectively a medium scalar and quotation of the sending end load; />
Figure FDA0004156085440000035
And->
Figure FDA0004156085440000036
Respectively a medium scalar and quotation of the sending-end generator; bj is the transmission price in the region of the transmitting end j province; bj is the power transmission fee in the area saved by the transmitting end j; />
Figure FDA0004156085440000037
And->
Figure FDA0004156085440000038
Respectively representing the tide and the power transmission price of the trans-provincial alternating current line in the transmitting end area; />
Figure FDA0004156085440000039
And->
Figure FDA00041560854400000310
The upper limit of the sending end generator and the load in the respective quotation section are respectively set; />
Figure FDA00041560854400000311
And->
Figure FDA00041560854400000312
The minimum and maximum climbing rates of the generator g are respectively saved for the sending end j; qs, t is the transmission power of the cross-region link s in the period t; />
Figure FDA00041560854400000313
The load flow transfer factors of the power generator at the transmitting end, the load and the falling point of the transregional direct current tie line to the alternating current circuit k at the transmitting end are respectively; />
Figure FDA00041560854400000314
And->
Figure FDA00041560854400000315
Respectively the minimum and maximum power flow limit values of the transmission end alternating current circuit k; />
Figure FDA00041560854400000316
The dual variables are the power balance constraint of the transmitting end; />
Figure FDA00041560854400000317
And
Figure FDA00041560854400000318
the dual variable is the flow constraint of the alternating current line at the transmitting end;
the in-area market clearing model taking the maximized social welfare of the receiving end area as the objective function refers to:
Figure FDA00041560854400000319
constraint conditions of the market clearing model in the area are as follows:
Figure FDA00041560854400000320
Figure FDA00041560854400000321
Figure FDA00041560854400000322
Figure FDA00041560854400000323
Figure FDA00041560854400000324
Figure FDA00041560854400000325
Figure FDA00041560854400000326
Figure FDA00041560854400000327
wherein: ire is the set of receiving end regions;
Figure FDA0004156085440000041
a load set saved for a receiving end i; />
Figure FDA0004156085440000042
A quotation segment set for saving load l for a receiving end i; />
Figure FDA0004156085440000043
A generator set saved for a receiving end i; />
Figure FDA0004156085440000044
A quotation segment set of the generator g is saved for the receiving end i; kre is a cross-provincial alternating current line set in the receiving end area; kre, in is the line set in the receiving area; />
Figure FDA0004156085440000045
And->
Figure FDA0004156085440000046
Respectively a medium scalar and quotation of the receiving end load; />
Figure FDA0004156085440000047
And->
Figure FDA0004156085440000048
Respectively a medium scalar and quotation of the receiving-end generator; bi is the power transmission price in the region of the receiving end i province; />
Figure FDA0004156085440000049
The purchase price of the cross-region connecting line s at the receiving end drop point is the time period t; />
Figure FDA00041560854400000410
The transmission price of the cross-region interconnecting line s; />
Figure FDA00041560854400000411
And->
Figure FDA00041560854400000412
Respectively representing the tide and the power transmission price of the cross-province alternating current line in the receiving area; />
Figure FDA00041560854400000413
And->
Figure FDA00041560854400000414
The upper limit of the receiving end generator and the load in the respective quotation section are respectively set; />
Figure FDA00041560854400000415
And->
Figure FDA00041560854400000416
The minimum and maximum climbing rates of the power generator g are respectively calculated by the receiving end i; xi is the transmission loss coefficient of the cross-region direct current interconnecting line s; />
Figure FDA00041560854400000417
The load flow transfer factors of the receiving-end generator, the load and the cross-region tie line drop point pair receiving-end alternating current line k are respectively; />
Figure FDA00041560854400000418
The upper limit of transmission power of the cross-region direct current interconnecting line s; />
Figure FDA00041560854400000419
And->
Figure FDA00041560854400000420
The minimum and maximum climbing rate of the cross-region direct current tie s; />
Figure FDA00041560854400000421
Is a dual variable constrained by the power balance of the receiver; />
Figure FDA00041560854400000422
And->
Figure FDA00041560854400000423
As the dual change of the current constraint of the alternating current line at the receiving endAn amount of;
alternating current line power transmission fee of cross-province in objective function
Figure FDA00041560854400000424
And->
Figure FDA00041560854400000425
) There is an absolute value, and to eliminate the nonlinearity caused by the absolute value term, the objective function is linearized by introducing auxiliary variables and constraints:
specifically, the auxiliary variables are:
Figure FDA00041560854400000426
Figure FDA00041560854400000427
specifically, the auxiliary constraints are:
Figure FDA00041560854400000428
Figure FDA00041560854400000429
Figure FDA00041560854400000430
Figure FDA00041560854400000431
wherein:
Figure FDA00041560854400000432
as a dual variable of the auxiliary constraint of the transmitting end; />
Figure FDA00041560854400000433
Is a dual variable constrained by the end assist;
one alternative to the ac line power transmission fee in the objective function is to:
Figure FDA0004156085440000051
Figure FDA0004156085440000052
7. the loose coupling clearing and pricing method for the electric power system according to claim 1, wherein the iterative solution of the inter-area market clearing model and the intra-area market clearing model by adopting a mode of transmitting inter-area purchase electricity price and inter-area purchase electricity demand is as follows: the inter-area market clearing model is optimized and solved under the condition of the inter-area electricity purchasing demand, and after the solution is finished, the node electricity price of the trans-regional direct current tie line at the sending end drop point is calculated, and the node electricity price is the inter-area electricity purchasing price and is used as a parameter to be transmitted into the intra-area market clearing model; the in-area market clearing model is optimized and solved under the condition of the inter-area purchase price, and the trans-regional direct current tie line transmission electric quantity is obtained after the solution is completed, and is used as a parameter to be transmitted into the inter-area market clearing model; and carrying out iteration clearing on the inter-area market and the intra-area market in a mode of transmitting the inter-area electricity purchase price and the inter-area electricity purchase demand, and ending the iteration when the difference between the current iteration result and the previous iteration result is smaller than a set value.
8. The loose coupling clearing and pricing method for the power system according to claim 1, wherein the market clearing result and the pricing result of each generator and load are calculated by solving an inter-regional market pricing model and an intra-regional market pricing model and adopting a node electricity price method;
the inter-region market pricing model fixes scalar in the trans-regional direct current tie line transmission electric quantity and the transmitting end load, and the objective function is to minimize the generating cost of the transmitting end, and specifically comprises the following steps:
Figure FDA0004156085440000053
constraint conditions of the inter-regional market pricing model and constraint conditions of the inter-regional market clearing model;
based on the node electricity price, the electricity price of the sending end generator at the node f is as follows:
Figure FDA0004156085440000054
and the sending end load pricing is based on the electricity price of the generator node, and the corresponding regional power transmission price is superimposed: />
Figure FDA0004156085440000055
The regional market pricing model is used for fixing scalar quantity in the trans-regional direct current tie line transmission electric quantity and the receiving end load, and the objective function is to minimize the receiving end power generation cost:
Figure FDA0004156085440000056
constraint conditions of the market clearing model in the constraint condition area of the market pricing model in the area;
based on the node electricity price, the electricity price of the receiving-end generator at the node f is as follows:
Figure FDA0004156085440000061
the receiving end load is priced at the node electricity price of the generatorAnd the corresponding regional power transmission prices are superimposed on the basis: />
Figure FDA0004156085440000062
By outputting the final market clearing results for each area, and pricing results for each generator and load, and publishing to all market members at the power trading center.
9. A power system loosely coupled cash out and pricing system implementing the power system loosely coupled cash out and pricing method of any one of claims 1-8, comprising: input module, clear module, iteration module, pricing module and output module, wherein: the input module collects quotation curve information of the generators and the loads in each area and outputs the quotation curve information to the clearing module; the clearing module optimizes and solves the inter-regional market clearing model by taking the maximized social benefit of the transmitting end region as an objective function and the maximized social benefit of the receiving end region as the objective function according to the constructed inter-regional market clearing model and the intra-regional market clearing model which take the power transmission rate into consideration, so as to obtain an inter-regional power clearing result and an intra-regional power clearing result; the iteration module is used for triggering the clearing module in an iteration mode until the absolute value of the difference between the current clearing result and the previous clearing result is smaller than a preset threshold value or reaches the preset iteration times, and a final inter-area power clearing result and an intra-area power clearing result are obtained; the pricing module is used for fixing scalar quantities in the trans-regional direct current tie line transmission electric quantity, the sending end load and the receiving end load according to the final inter-regional power clearing result and the regional power clearing result, solving an inter-regional market pricing model and an regional market pricing model, and pricing each generator and load by adopting a node electricity price method; the output module outputs a final inter-zone power result, an intra-zone power result, and pricing results for each generator and load.
CN202310334899.XA 2023-03-31 2023-03-31 Loose coupling clearing and pricing method for power system considering power transmission fee Pending CN116342162A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277315A (en) * 2023-11-21 2023-12-22 中国电力科学研究院有限公司 Inter-province intra-province market self-adaptive clearing method, device, equipment and medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277315A (en) * 2023-11-21 2023-12-22 中国电力科学研究院有限公司 Inter-province intra-province market self-adaptive clearing method, device, equipment and medium
CN117277315B (en) * 2023-11-21 2024-02-13 中国电力科学研究院有限公司 Inter-province intra-province market self-adaptive clearing method, device, equipment and medium

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