CN113869693A - Power transmission line construction decision method for power grid company in spot market environment - Google Patents
Power transmission line construction decision method for power grid company in spot market environment Download PDFInfo
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Abstract
The invention discloses a power transmission line construction decision method for a power grid company in a spot market environment, and belongs to the field of electrical engineering. The decision method is composed of two parts, wherein the first part analyzes and decides the positions and the number of the power transmission line construction based on the operation states of all units after market clearing, and the second part carries out market clearing according to the line construction conditions of the first part and transmits the corresponding unit operation states to the first part. The method can effectively assist decision analysis of power transmission line construction of a power grid company in a spot market environment, is beneficial to reducing power transmission line blockage, and optimizes distribution of power resources.
Description
Technical Field
The invention belongs to the field of electrical engineering, and particularly relates to a power transmission line construction decision method for a power grid company in a spot market environment.
Background
The traditional power transmission line construction decision method aims to improve the power supply reliability so as to ensure the stable power utilization of users. On one hand, the decision method cannot timely find the blockage of the line, so that the unreasonable power resource distribution is caused, and the running efficiency of the power system is low; on the other hand, excessive construction of the power transmission lines is easily caused, and the capacity utilization rate of some power transmission lines is not high, so that the resource is greatly wasted. With the gradual implementation of spot market reform in our country, the contradiction between the traditional power transmission line construction decision method and the market environment is increasingly prominent, so that a power transmission line construction decision method adaptive to the spot market environment needs to be built urgently to reduce the blockage of the power transmission line and optimize the distribution of power resources.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a power transmission line construction decision method for a power grid company in a spot market environment, and aims to solve the problem that a power transmission line construction decision scheme of the power grid company in the prior art is not matched with the spot market environment.
In order to achieve the above object, the present invention provides a power transmission line construction decision method for a power grid company in a spot market environment, comprising:
analyzing and deciding the positions and the number of the power transmission line construction based on the running state of each set after market clearing;
according to the line construction condition, market clearing is carried out to obtain a corresponding unit running state; the unit running state comprises the starting and stopping state, the output and the loss load of each unit;
and constructing a direct current power flow model as a power transmission network planning model based on the unit operation state to represent the operation state of the power transmission network.
The positions and the number of the power transmission line construction are determined by a formula (1);
wherein l is the number of the power transmission corridor; x is the number oflThe number of newly built lines in the power transmission corridor l is an integer; clThe construction cost for one line in the power transmission corridor l; i is the number of the generator set; t is a time interval number; m is a quotation section number; ci,t,mQuoting the unit i in the mth section of the time period t; pi,t,mThe power of the unit i winning the bid in the mth section of quotation in the time period t;starting cost of the unit i in a time period t; d is a load number; penalty is a penalty factor for lost load; LL (LL)d,tIs the magnitude of the loss of load of the load d in the time period t.
Due to the limitation of objective conditions such as environmental protection or physical space, the number of newly-built lines is also limited:
whereinAnd establishing an upper limit on the number of newly-built lines for the power transmission corridor l.
The unit running state comprises the starting and stopping state, the output and the load loss of each unit, and is expressed by the following formula:
the output power of the unit has upper and lower limit values when the unit is started, and the output of the unit is 0 when the unit is stopped:
wherein alpha isi,tStarting and stopping a unit i in a time period t, wherein 1 is starting and 0 is stopping;the minimum power and the maximum power of the unit i in the time period t are respectively.
Wherein, for the safe operation of unit, the climbing speed of unit also receives the restriction, and the difference of the power of exerting oneself of two moments before and after the unit has the upper limit promptly:
wherein Δ Pi U,ΔPi DThe maximum up-down climbing speed of the unit i is respectively.
The thermal power generating unit is required to meet the minimum continuous starting/stopping time due to the physical properties and the actual operation requirements of the thermal power generating unit:
wherein T isU、TDThe minimum continuous starting time and the minimum continuous stopping time of the unit are obtained;the time when the unit i has been continuously started and stopped at time t, respectively, can be used as the state variable alphai,t(i is 1 to N, and T is 1 to T):
the total output of the unit is the sum of the outputs of the quotation intervals of all sections:
whereinRespectively the upper and lower boundaries of the mth output interval declared by the unit i.
The direct current power flow model formula is expressed as follows:
fl,t=Bl(θns(l),t-θnr(l),t) (25)
-Ml·(1-Xl)≤Nfl,t-xl·Bl(θns(l),t-θnr(l),t)≤Ml·(1-Xl) (26)
the constraint (9) is a direct current power flow model of the existing line, and the constraint (10) is a direct current power flow model of the newly-built line. f. ofl,tThe power flow of the line l in the time period t; b islIs the admittance of line l; thetans(l),tThe phase angle of the voltage of the sending end node of the line l in the time period t; thetanr(l),tThe voltage phase angle of a receiving end node of a line l in a time period t; nfl,tEstablishing a power flow on a new line l; mlIs a larger number, relaxing the constraint;
the flow of lines is limited by the capacity of the line:
-fl max≤fl≤fl max (27)
-Nfl max·Xl≤Nfl≤Nfl max·Xl (28)
wherein f isl maxIs the capacity of line l; nfl maxThe capacity of a newly-built line l is obtained;
the voltage phase angle of each node has a range limit:
-θmax≤θn≤θmax (29)
wherein theta isnIs the voltage phase angle of node n; thetamaxTaking 180 as the maximum value of the voltage phase angle;
the voltage phase angle of the relaxation node is 0:
θslack=0 (30)
each node in the system should satisfy power balance:
wherein G isnIs the set of all generators at node n; l | nr (L) ═ n is a set of all lines whose nodes n are terminated; l | ns (L) ═ n is a set of all lines with node n as the transmission end; dnIs the set of all loads at node n.
Wherein, the spare capacity is set to prevent the emergency and ensure the safe and reliable operation; the reserve capacity is formulated as:
wherein R isDIs a percentage of the spare.
Compared with the prior art, the decision-making method for the power transmission line construction of the power grid company in the spot market environment is composed of two parts, wherein the first part analyzes and decides the construction position and the construction quantity of the power transmission line based on the operation state of each set after market clearing, and the second part carries out market clearing according to the line construction condition of the first part and transmits the corresponding operation state of the set to the first part. The method can effectively assist decision analysis of power transmission line construction of a power grid company in a spot market environment, is beneficial to reducing power transmission line blockage, and optimizes distribution of power resources.
Drawings
Fig. 1 is a schematic flow chart of a power transmission line construction decision method of a power grid company in a spot market environment according to the present invention.
Fig. 2 is a logic schematic diagram of a power transmission line construction decision method of a power grid company in a spot market environment according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
As shown in fig. 1 and 2; the invention provides a power transmission line construction decision method of a power grid company in a spot market environment, which comprises the following steps:
analyzing and deciding the positions and the number of the power transmission line construction based on the running state of each set after market clearing;
according to the line construction condition, market clearing is carried out to obtain a corresponding unit running state; the unit running state comprises the starting and stopping state, the output and the loss load of each unit;
and constructing a direct current power flow model as a power transmission network planning model based on the unit operation state to represent the operation state of the power transmission network.
The first part analyzes and decides the positions and the quantity of the power transmission line construction based on the running state of each unit after market clearing: the positions and the number of the power transmission line construction are determined by a formula (1);
wherein l is the number of the power transmission corridor; x is the number oflThe number of newly built lines in the power transmission corridor l is an integer; clThe construction cost for one line in the power transmission corridor l; i is the number of the generator set; t is a time interval number; m is a quotation section number; ci,t,mQuoting the unit i in the mth section of the time period t; pi,t,mThe power of the unit i winning the bid in the mth section of quotation in the time period t;starting cost of the unit i in a time period t; d is a load number; penalty is a penalty factor for lost load; LL (LL)d,tIs the magnitude of the loss of load of the load d in the time period t.
Due to the limitation of objective conditions such as environmental protection or physical space, the number of newly-built lines is also limited:
whereinAnd establishing an upper limit on the number of newly-built lines for the power transmission corridor l.
And the second part carries out market clearing according to the line construction condition of the first part to obtain corresponding unit operation states, wherein the unit operation states comprise the starting and stopping states, the output and the load loss of each unit and are expressed by a formula as follows:
the output power of the unit has upper and lower limit values when the unit is started, and the output of the unit is 0 when the unit is stopped:
wherein alpha isi,tStarting and stopping a unit i in a time period t, wherein 1 is starting and 0 is stopping;the minimum power and the maximum power of the unit i in the time period t are respectively.
Wherein, for the safe operation of unit, the climbing speed of unit also receives the restriction, and the difference of the power of exerting oneself of two moments before and after the unit has the upper limit promptly:
wherein Δ Pi U,ΔPi DMaximum climbing and descending of unit iThe ramp rate.
The thermal power generating unit is required to meet the minimum continuous starting/stopping time due to the physical properties and the actual operation requirements of the thermal power generating unit:
wherein T isU、TDThe minimum continuous starting time and the minimum continuous stopping time of the unit are obtained;the time when the unit i has been continuously started and stopped at time t, respectively, can be used as the state variable alphai,t(i is 1 to N, and T is 1 to T):
the total output of the unit is the sum of the outputs of the quotation intervals of all sections:
whereinRespectively the upper and lower boundaries of the mth output interval declared by the unit i.
The direct current power flow model formula is expressed as follows:
fl,t=Bl(θns(l),t-θnr(l),t) (41)
-Ml·(1-Xl)≤Nfl,t-xl·Bl(θns(l),t-θnr(l),t)≤Ml·(1-Xl) (42)
the constraint (9) is a direct current power flow model of the existing line, and the constraint (10) is a direct current power flow model of the newly-built line. f. ofl,tIs a wirePower flow of the way l in the time period t; b islIs the admittance of line l; thetans(l),tThe phase angle of the voltage of the sending end node of the line l in the time period t; thetanr(l),tThe voltage phase angle of a receiving end node of a line l in a time period t; nfl,tEstablishing a power flow on a new line l; mlIs a larger number, relaxing the constraint;
the flow of lines is limited by the capacity of the line:
-fl max≤fl≤fl max (43)
-Nfl max·Xl≤Nfl≤Nfl max·Xl (44)
wherein f isl maxIs the capacity of line l; nfl maxThe capacity of a newly-built line l is obtained;
the voltage phase angle of each node has a range limit:
-θmax≤θn≤θmax (45)
wherein theta isnIs the voltage phase angle of node n; thetamaxTaking 180 as the maximum value of the voltage phase angle;
the voltage phase angle of the relaxation node is 0:
θslack=0 (46)
each node in the system should satisfy power balance:
wherein G isnIs the set of all generators at node n; l | nr (L) ═ n is a set of all lines whose nodes n are terminated; l | ns (L) ═ n is a set of all lines with node n as the transmission end; dnIs the set of all loads at node n.
Wherein, the spare capacity is set to prevent the emergency and ensure the safe and reliable operation; the reserve capacity is formulated as:
wherein R isDIs a percentage of the spare.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A power transmission line construction decision method of a power grid company under a spot market environment is characterized by comprising the following steps:
analyzing and deciding the positions and the number of the power transmission line construction based on the running state of each set after market clearing;
according to the line construction condition, market clearing is carried out to obtain a corresponding unit running state; the unit running state comprises the starting and stopping state, the output and the loss load of each unit;
and constructing a direct current power flow model as a power transmission network planning model based on the unit operation state to represent the operation state of the power transmission network.
2. The power transmission line construction decision method of the power grid company under the spot market environment according to claim 1, characterized in that the position and number of power transmission line construction are determined by formula (1);
wherein l is the number of the power transmission corridor; x is the number oflThe number of newly built lines in the power transmission corridor l is an integer; clFor a line in a power transmission corridor lConstruction cost; i is the number of the generator set; t is a time interval number; m is a quotation section number; ci,t,mQuoting the unit i in the mth section of the time period t; pi,t,mThe power of the unit i winning the bid in the mth section of quotation in the time period t;starting cost of the unit i in a time period t; d is a load number; penalty is a penalty factor for lost load; LL (LL)d,tIs the magnitude of the loss of load of the load d in the time period t.
3. The method for decision-making of power transmission line construction of power grid company in spot market environment according to claim 2, wherein the number of newly-built lines is also limited due to the limitation of objective conditions such as environmental protection or physical space:
4. The method for decision-making for power transmission line construction of a power grid company in a spot market environment according to claim 1, wherein the unit operation states include start-up and shut-down states, output and loss of load of each unit are expressed by the following formulas:
the output power of the unit has upper and lower limit values when the unit is started, and the output of the unit is 0 when the unit is stopped:
5. The method for decision-making of power transmission line construction of power grid company in spot market environment according to claim 1, wherein for safe operation of the unit, the ramp rate of the unit is also limited, i.e. the difference between the output power of the unit at two moments before and after has an upper limit value:
wherein Δ Pi U,ΔPi DThe maximum up-down climbing speed of the unit i is respectively.
6. The power transmission line construction decision method for the power grid company in the spot market environment according to claim 1, characterized in that the thermal power generating unit is required to meet minimum continuous startup/shutdown time due to physical properties and actual operation needs of the thermal power generating unit:
wherein T isU、TDThe minimum continuous starting time and the minimum continuous stopping time of the unit are obtained;the time when the unit i is continuously started and stopped in the time period t respectively uses the state variable alphai,t(i is 1 to N, and T is 1 to T):
the total output of the unit is the sum of the outputs of the quotation intervals of all sections:
7. The power transmission line construction decision method of the power grid company in the spot market environment according to claim 1, wherein the direct current power flow model formula is expressed as:
fl,t=Bl(θns(l),t-θnr(l),t) (9)
-Ml·(1-Xl)≤Nfl,t-xl·Bl(θns(l),t-θnr(l),t)≤Ml·(1-Xl) (10)
the constraint (9) is a direct current power flow model of the existing line, and the constraint (10) is a direct current power flow model of the newly-built line. f. ofl,tThe power flow of the line l in the time period t; b islIs the admittance of line l; thetans(l),tThe phase angle of the voltage of the sending end node of the line l in the time period t; thetanr(l),tThe voltage phase angle of a receiving end node of a line l in a time period t; nfl,tEstablishing a power flow on a new line l; mlIs a larger number, relaxing the constraint;
the flow of lines is limited by the capacity of the line:
-fl max≤fl≤fl max (11)
-Nfl max·Xl≤Nfl≤Nfl max·Xl (12)
wherein f isl maxIs the capacity of line l; nfl maxThe capacity of a newly-built line l is obtained;
the voltage phase angle of each node has a range limit:
-θmax≤θn≤θmax (13)
wherein theta isnIs the voltage phase angle of node n; thetamaxTaking 180 as the maximum value of the voltage phase angle;
the voltage phase angle of the relaxation node is 0:
θslack=0 (14)
each node in the model is to satisfy power balance:
wherein G isnIs the set of all generators at node n; l | nr (L) ═ n is a set of all lines whose nodes n are terminated; l | ns (L) ═ n is a set of all lines with node n as the transmission end; dnIs the set of all loads at node n.
8. The power transmission line construction decision method for power grid companies in spot market environment according to claim 1, characterized in that a reserve capacity is set to prevent an emergency and ensure safe and reliable operation; the reserve capacity is formulated as:
wherein R isDIs a percentage of the spare.
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CN112446540A (en) * | 2020-11-25 | 2021-03-05 | 广东电网有限责任公司电力调度控制中心 | Electric power spot market clearing and settlement optimizing method and device |
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2021
- 2021-09-23 CN CN202111111158.2A patent/CN113869693A/en active Pending
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CN102315639A (en) * | 2010-07-09 | 2012-01-11 | 中国电力工程顾问集团华东电力设计院 | Method and system for adjusting load-bearing capacity of external communication channel of power grid supply region |
US20190296548A1 (en) * | 2014-09-22 | 2019-09-26 | Sureshchandra B. Patel | Methods of Patel Loadflow Computation for Electrical Power System |
CN108683192A (en) * | 2018-06-27 | 2018-10-19 | 广东电网有限责任公司 | A kind of power spot market goes out clearing method, system, equipment and storage medium |
WO2021062932A1 (en) * | 2019-09-30 | 2021-04-08 | 国电南瑞科技股份有限公司 | Electric power spot market clearing calculation method based on multi-policy fusion dimension reduction |
CN112072636A (en) * | 2020-07-24 | 2020-12-11 | 国网天津市电力公司电力科学研究院 | Power spot market operation method based on source network load uncertainty factor |
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