CN111324866A - Method for calculating discharge capacity of power system - Google Patents
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Abstract
The application provides a method for calculating the emission of an electric power system, which comprises the steps of calculating the total first active power of an active input device injected into a user node of a user side, wherein the active input device comprises a generator and a power supply and distribution line; calculating a second active power total amount injected into the user node by the transformer substation end according to the power consumption loss of the power transmission link and the first active power total amount; obtaining a tracing function according to the second active power total amount; converting the power grid from the user side to the transformer substation side and then to the power supply side into a traceability matrix according to a traceability function; calculating related network loss and injected active power quantity of a power generator at a power supply end on a power supply and distribution line according to the tracing matrix; calculating according to the active power quantity and the network loss to obtain a third active power total quantity provided by the generator by the user node; and obtaining the emission of the electric power system by the product of the first active power total amount, the second active power total amount, the third active power total amount and the corresponding emission coefficient. The electric power system emission accuracy that this application obtained is high.
Description
Technical Field
The application relates to the field of emission of power plants, in particular to an emission calculation method of an electric power system.
Background
At present, carbon dioxide, nitrogen dioxide and smoke dust gas discharged by the traditional power industry in China are the largest discharge sources in national economy, and in order to better reduce the discharge of the traditional power industry and promote the access of green new energy power, the discharge of each link of a power system needs to be accurately calculated.
Each power end and a user end in the power system usually have a long power transmission distance, which brings certain difficulty to the calculation of the emission. The conventional emission amount calculation method only uses a power plant as an emission source, and calculates the emission amount according to the active total amount and the emission intensity of the power plant.
However, the emission calculation method does not consider the grid loss in the active power transmission process of the power system and the emission generated in the power utilization process of the user side, the emission of the power system is all equal to the emission of a power plant, the emission generated by the line loss, the internal consumption of the main transformer and the power utilization of the user side in the power transmission process is neglected, and the error between the calculation result and the actual emission reduction is large.
Disclosure of Invention
The application provides a method for calculating the emission of an electric power system, which aims to solve the problem of low accuracy of calculation of the emission of the electric power system.
The application provides a method for calculating the emission of an electric power system, which comprises the following steps:
calculating a first active power total amount of an active input device injected into a user node of a user side, wherein the active input device comprises a generator and a power supply and distribution line;
calculating a second active power total amount injected into the user node by the transformer station end according to the power consumption loss of the power transmission link and the first active power total amount;
obtaining a tracing function according to the second active power total amount;
converting the power grid from the user side to the transformer station side and then to the power supply side into a traceability matrix according to the traceability function;
calculating the related network loss and the injected active power quantity of the power generator at the power supply and distribution line according to the source tracing matrix;
calculating according to the active power quantity and the network loss to obtain a third active power total quantity provided by the generator by the user node;
and respectively obtaining the emission of the user link, the power supply and distribution system and the power plant by the product of the first active power total amount, the second active power total amount, the third active power total amount and the corresponding emission coefficient.
Optionally, the calculating a first total active power amount of the active input device injected into the user node at the user end includes: according to
Obtaining a first total active power amount of the active input device injected into the user node of the user side, wherein Piα for the first total active poweriFor all the node sets connected to and inputting power to the user nodes, PjiInputting the power of the user node for a branch j-i in a power supply and distribution line connected to the user nodeGiInjecting power for the generator on the customer node into the customer node.
Optionally, the tracing function includes auP＝PGWherein A isuIs a traceability matrix of N × N orders, P is a vector of total power traceability of each node of the power grid, P isGAnd (4) power vectors injected for each generator of the power grid.
Optionally, the elements in the tracing matrix are:
optionally, the tracing matrix comprises
Wherein E is an identity matrix, PEIs a branch flow distribution matrix, PNIs a node active flux matrix.
Optionally, the calculating, according to the traceability matrix, an amount of active power on the power supply and distribution line, related to network loss and injection of the power generator at the power supply end includes:
according to
To obtain a generator GkActive power quantity P injected on the power supply and distribution lineij，Gk；
According to
To obtain a generator GkRelative network loss on the power supply and distribution line, wherein βiIs the outgoing line set of the user node.
Optionally, the obtaining, according to the active power amount and the network loss, a third active power total amount provided by the generator by the user node by calculation includes: according to
Obtaining a third active power total P provided by the generator for the user nodeLi,Gk。＝
Optionally, the power transmission link power loss amount includes a power supply end and a line power loss amount of a substation end, a transformer internal power loss amount of the substation end, and a meter error power amount.
The beneficial effects of the power system emission calculation method provided by the application comprise:
the embodiment of the application provides a method for calculating the emission of an electric power system, which takes the active power actually consumed by a user side as a starting point, and traces to an active power source at a power plant side according to a line distribution rule of the electric power system and a transmission path of the active power. And acquiring the total active power of the user side to the power supply side power plant in the whole path, and acquiring the emission of each link of the user, the power supply and distribution system and the power plant according to the product of the total active power of the whole path and the emission coefficient. The method overcomes the defects that the traditional calculation result has large deviation, incomplete calculation, insufficient fairness and the like because the emission generated by a user side, the network loss of power supply and distribution links and the like is not involved in the emission calculation method of the traditional power system, and provides a feasible technical means and an accurate calculation method for related objects needing and calculating the emission of each link of active transmission.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic diagram of a tracing path and a direction of an emission amount according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for calculating an emission amount of an electric power system according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
Referring to fig. 1, for a discharge amount tracing path and a direction schematic diagram provided in the embodiment of the present application, as shown in fig. 1, in the embodiment of the present application, a user side is used as a starting point, an active power flow direction of a power transmission link is obtained according to a line distribution rule of a power system and a transmission path of active power, and the active power is traced to a power generation end through the power transmission link. For example, at the user side, the power consumption of the user side is collected, and the active power actually consumed by the user side is obtained according to the power consumption of the user side; in a power transmission link, respectively acquiring power consumption loss of a power distribution line, transformer power consumption loss and power consumption loss of a power transmission line according to the emission traceability direction and the path; and acquiring the actual power of the power plant at the power supply end, so that the total active power from the user end to the power supply end in the whole path can be acquired, and the emission of each link of the user, the power supply and distribution system and the power plant can be acquired through the product of the total active power in the whole path and the emission coefficient.
The method for calculating the emission amount is shown in fig. 2, and comprises the following steps:
step S110: and calculating a first active power total amount of the active input device injected into the user node of the user terminal, wherein the active input device comprises a generator and a power supply and distribution line.
Assuming that L branches and N nodes exist from a user node i to a power supply and distribution line of a corresponding transformer substation system, the total amount of first active power injected into the user node i is PiThen P isiCan be expressed as:
(1) in the formula, αiSet of nodes, P, for all connections to and input power to a user node ijiInputting power, P, of a subscriber node i for a branch j-i of a power supply and distribution line connected to the subscriber node iGiAnd injecting power of the user node i for the generator on the user node i.
Step S120: and calculating a second active power total amount injected into the user node by the transformer station end according to the power consumption loss of the power transmission link and the first active power total amount.
Because the power loss inside the transformer substation is in direct proportion to the actual power supply load, the actual total power C of the transformer substation can be obtained for the reasonij＝Pji/PjThen the injection of the transformer station end into the user node i can be calculatedTotal second active power:
step S130: and obtaining a tracing function according to the second active power total amount.
The tracing function can be obtained by simplifying the formula (2):
AuP＝PG(3)
(3) in the formula, AuIs a traceability matrix of N × N orders, P is a vector of total power traceability of each node of the power grid, P isGAnd (4) power vectors injected for each generator of the power grid.
Step S140: and converting the power grid from the user side to the transformer station side and then to the power supply side into a traceability matrix according to the traceability function.
Converting nodes from the user side to the transformer station side and then to the power supply side and a power supply loop into a traceability matrix AuThe element in (4) is shown in formula:
simplifying formula (4) to obtain formula (5):
(5) wherein E is an identity matrix, PEIs a branch flow distribution matrix, PNIs a node active flux matrix.
Step S150: and calculating the related network loss and the injected active power quantity of the power generator at the power supply end on the power supply and distribution line according to the tracing matrix.
According to the power supply side generator GkThe effective active power provided to the user node i is
Through the proportion sharing principle, the generator G is obtainedkActive power injected on power supply and distribution linesPij，GAnd generator GkNetwork loss P on power supply and distribution lineslossij，Gk：
(7) In the formula, βiIs the outgoing line set of the user node i.
Step S160: and calculating according to the active power quantity and the network loss to obtain a third active power total quantity provided by the generator by the user node.
According to the formulas (6) and (7), the load power of the user node i is known to be PLiLoad power P of user node iLiGenerator G from power supply endkThe total amount of the third active power is provided as follows:
step S170: and respectively obtaining the emission of the user link, the power supply and distribution system and the power plant by the product of the first active power total amount, the second active power total amount, the third active power total amount and the corresponding emission coefficient.
The discharge coefficient refers to the discharge rate per action, yield, or input unit. The emission coefficients of the user side, the power supply and distribution system and the power supply end can be specifically set according to actual conditions, and the emission amount of the power supply end power plant can be obtained according to the product of the total amount of the third active power and the emission coefficient.
And according to the product of the user side, the power supply and distribution system and the corresponding emission coefficients, the emission of the user side and the emission of the power supply and distribution system can be obtained.
It can be seen from the above embodiments that, for the emission generated by the power supply side in the conventional power system emission calculation process, the line loss consumption, the transformer conversion efficiency, and the metering error of the electric energy meter during the power transmission process are not fully consideredAnd the emission generated by the user side and other factors cause the problem that the calculation result of the emission of the power system is not accurate enough. The method comprises the steps of acquiring the power consumption power of a user side, the line loss electric quantity, the main transformer internal power consumption quantity and the power generation end output active power, acquiring the total active power of the user side to the power supply side power plant in the whole path, and acquiring the emission quantity of each link of the user, the power supply and distribution system and the power plant by the product of the total active power of the whole path and the emission coefficient. The method and the device can accurately calculate the active power in any L lines of the power grid, which generators provide the active power, and the emission amount actually generated by each generator; pLi,Gk，Pij,GkAnd Plossij,GkRespectively multiplying the power generation efficiency and the power generation efficiency by the emission coefficient corresponding to the Gk to obtain the load of each node, the total active power of the line and the emission corresponding to the active network loss of the line; the embodiment of the application can trace out which generators provide each load of the user side, and the power and the corresponding emission amount provided by each generator respectively. The method and the device for calculating the emission make up the defects that the emission generated by a user side, the network loss of power supply and distribution links and the like is not involved in the traditional emission calculation method, the traditional calculation result is large in deviation, incomplete in calculation, insufficient in fairness and the like, and a feasible technical means and an accurate calculation method are provided for related objects needing and calculating the emission of each link of active transmission.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (8)
1. A method for calculating an amount of emissions from an electric power system, comprising:
calculating a first active power total amount of an active input device injected into a user node of a user side, wherein the active input device comprises a generator and a power supply and distribution line;
calculating a second active power total amount injected into the user node by the transformer station end according to the power consumption loss of the power transmission link and the first active power total amount;
obtaining a tracing function according to the second active power total amount;
converting the power grid from the user side to the transformer station side and then to the power supply side into a traceability matrix according to the traceability function;
calculating the related network loss and the injected active power quantity of the power generator at the power supply and distribution line according to the source tracing matrix;
calculating according to the active power quantity and the network loss to obtain a third active power total quantity provided by the generator by the user node;
and respectively obtaining the emission of the user link, the power supply and distribution system and the power plant by the product of the first active power total amount, the second active power total amount, the third active power total amount and the corresponding emission coefficient.
2. The method according to claim 1, wherein the calculating the first total amount of active power that the active input device injects into the user node at the user end comprises: according to
Obtaining a first total active power amount of the active input device injected into the user node of the user side, wherein Piα for the first total active poweriFor all the node sets connected to and inputting power to the user nodes, PjiInputting the power of the user node for a branch j-i in a power supply and distribution line connected to the user nodeGiInjecting power for the generator on the customer node into the customer node.
3. The method of claim 2, wherein the traceability function comprises auP＝PGWherein A isuIs a traceability matrix of N × N orders, P is a vector of total power traceability of each node of the power grid, P isGAnd (4) power vectors injected for each generator of the power grid.
4. The method according to claim 3, wherein the elements in the traceability matrix are:
5. the method of claim 3, wherein the traceability matrix comprises
Wherein E is an identity matrix, PEIs a branch flow distribution matrix, PNIs a node active flux matrix.
6. The method according to claim 5, wherein the calculating the grid loss and the injected active power quantity of the power supply end generator on the power supply and distribution line according to the traceability matrix comprises:
according to
To obtain a generator GkActive power quantity P injected on the power supply and distribution lineij，Gk；
According to
To obtain a generator GkRelative network loss on the power supply and distribution line, wherein βiIs the outgoing line set of the user node.
7. The method according to claim 6, wherein the calculating a third total amount of active power provided by the generator by the user node according to the active power amount and the grid loss comprises: according to
Obtaining a third active power total P provided by the generator for the user nodeLi,Gk。
8. The method according to claim 1, wherein the power transmission link power loss comprises power supply terminal and substation terminal line power loss, substation terminal transformer power loss, and meter error power.
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| CN114117350A (en) * | 2021-11-29 | 2022-03-01 | 特斯联科技集团有限公司 | Carbon emission analysis method for power industry |
| CN114117350B (en) * | 2021-11-29 | 2024-06-21 | 特斯联科技集团有限公司 | Carbon emission analysis method in power industry |
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| WO2010095687A1 (en) * | 2009-02-20 | 2010-08-26 | 株式会社日立製作所 | Carbon traceability management system |
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