CN111900730B - Online calculation method and device for thermal stability quota interval of power transmission channel - Google Patents
Online calculation method and device for thermal stability quota interval of power transmission channel Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a method and a device for calculating a thermal stability quota interval of a power transmission channel on line. The method meets the requirements of online application on accuracy and real-time performance, and has guiding significance for the dispatchers to fully master the safe and stable operation boundary of the power grid and efficiently utilize the power transmission capability of the power transmission channel.
Description
Technical Field
The invention relates to an on-line calculation method and device for a thermal stability quota interval of a power transmission channel, and belongs to the technical field of scheduling operation control of power systems.
Background
Monitoring the transmission power of a key transmission channel in a power grid is an important means for a power grid dispatching operation controller to control the safety of the power grid, the thermal stability transmission limit of the transmission channel is constrained by the maximum current carrying of all transmission equipment forming the transmission channel, namely the current of the transmission equipment does not exceed the long-term allowable current in a normal operation state, and the current of the transmission equipment does not exceed the short-term allowable current after a fault equipment is disconnected. According to a determined power grid operation mode, an active increase amount of a section composition device is directly calculated according to an active transfer ratio of the device to the section composition device after the device is switched on and off, the current carrying capacity of the device is converted into an active limit value according to a set device power factor, and the maximum active value of the section before the device is switched on and off is taken as the thermal stability limit of the device under the constraint that the active power of the section composition device before the device is switched on and after the device is not more than the corresponding active limit value. The method is high in calculation speed, but the influence of the active adjustable space and the nonlinear characteristic of the power grid load flow on the calculation result is not considered, so that the method cannot be directly used for on-line monitoring of the power grid transmission channel.
The thermal stability limit of the power transmission channel is not only related to the operation mode of a power grid and the power (active and reactive) adjustable space of each node, but also related to the power adjustment mode of each node, the power adjustment modes are different, the thermal stability limit of the power transmission channel is also different, and the thermal stability limit of the power transmission channel changes within an interval along with the change of the power adjustment modes.
The patent 'identification method and equipment of power limit interval of thermal stability transmission channel' (application number: 201910264792.6) provides a method for calculating an influence factor of node active power on the upper limit and the lower limit of the transmission channel, determines an active power adjusting mode of adjustable equipment at a transmitting end and a receiving end according to the size of the influence factor, combines an adjustable space to generate a power adjusting scheme, and carries out thermal stability check on flow transfer leading equipment of the transmission channel under the power adjusting scheme based on active sensitivity to obtain the upper limit and the lower limit of the thermal stability limit of the transmission channel. The method does not need optimization, has high calculation speed, but has an unclear mechanism and does not consider the nonlinear characteristic of the power grid load flow, so that the precision of the calculation result is difficult to guarantee.
Disclosure of Invention
The invention aims to provide an on-line calculation method and device for a thermal stability quota interval of a power transmission channel, and aims to solve the problem that calculation accuracy is difficult to guarantee in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a power transmission channel thermal stability quota interval on-line calculation method comprises the following steps:
obtaining a power grid running state S at the current moment, an active adjustable interval of a node in an active injection node set N, N in a set time length, a power transmission channel forming device set T, and thermal stability checking of a power transmission channel, wherein long-term allowable current and short-term allowable current of power transmission equipment in an expected on-off device set F, T are obtained;
establishing a power flow equation of the S, and calculating the active sensitivity of the node active power in the N to the power transmission equipment in the T, the active sensitivity to a power transmission channel and the active transfer ratio of the equipment on/off in the F to the power transmission equipment in the T according to the power flow equation of the S;
screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length under the S condition to obtain a screened node set N';
according to the load flow equation of the S, calculating the active sensitivity of the nodes in the N' to the network loss and the active sensitivity of the nodes in the F to the equipment in the F;
based on S, in an active adjustable interval of a node in N 'within a set time length, considering active sensitivity of the node in N' to a power transmission channel, active sensitivity to power transmission equipment in T, sensitivity to network loss and active sensitivity to equipment in F, and an active transfer ratio of the equipment in F to the power transmission equipment in T when the equipment is switched on and off, respectively taking the active maximum of the power transmission channel and the active minimum of the power transmission channel as optimization targets by setting different overload coefficients, taking the active power of the node in N 'as a variable, and taking the constraint conditions of power grid active balance and the condition that the power transmission equipment in T is not overloaded before and after the equipment in F is switched on and switched off as constraint conditions to carry out optimization calculation to obtain active power of each node in N' corresponding to different overload coefficients under the active maximum optimization condition of the power transmission channel and the active minimum optimization condition of the power transmission channel;
based on S, according to the active power of each node in N' corresponding to different overload coefficients under the condition of maximum active power optimization and the condition of minimum active power optimization of a power transmission channel, taking the voltage amplitude range and the reactive power regulation range of each node in a power grid as constraint conditions, carrying out load flow calculation before disconnection and after disconnection of the equipment in F, and respectively obtaining the current before disconnection of the equipment in F, the current after disconnection of the equipment in T and the active power of the power transmission channel before disconnection of the equipment in F under different overload coefficients under two conditions;
and determining the upper limit and the lower limit of the thermal stability quota interval of the transmission channel based on the calculated current before the disconnection of the equipment in the F, the current after the disconnection of the equipment in the T and the active power of the transmission channel before the disconnection of the equipment in the F under different overload coefficients under two conditions.
Further, the active transfer ratio of the device disconnection in F to the power transmission device in T refers to the ratio of the active change amount of the power transmission device in T after the device disconnection in F to the active power of the power transmission device in T before the disconnection by the disconnection device in S.
Further, the screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to the power transmission channel, and the active adjustable interval of the nodes in the N within the set time length under the condition of S to obtain a screened node set N' includes:
determining an active sensitivity interval for screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length;
and removing the nodes of the active power sensitivity of the nodes to the active power sensitivity of the power transmission channel in the active power sensitivity interval from the N to obtain a screened node set N'.
Further, the determining an active sensitivity interval for screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to the power transmission channel, and the active adjustable interval of the nodes in the N within the set time length includes the following steps:
sequencing nodes in a node set A with active power sensitivity of nodes in N to a power transmission channel larger than 0 according to the sequence of active power sensitivity from large to small, solving a formula (1) to obtain a node serial number k in A, and taking the active power sensitivity of the node of the serial number to the power transmission channel as the upper limit of an active power sensitivity interval;
wherein I is the serial number of the ith node in A, V is the voltage average value of the sending end node of the power transmission equipment in T under S, and ImaxThe sum of long-term allowable currents of the power transmission equipment in T, P is the active sum of the transmitting end of the power transmission equipment in T under S, Q is the reactive sum of the transmitting end of the power transmission equipment in T under S, ST.iIs the active sensitivity of node with serial number i in A to the active power of power transmission channel, Pi.uIs the upper limit of the active adjustable interval of the node with sequence number i in A, PiThe active power of the node with the serial number i in the A under the S is shown, and alpha is a set parameter and is larger than 1;
sequencing nodes in a node set B aiming at nodes in N with active power sensitivity smaller than 0 to a power transmission channel, wherein the active power sensitivity is in a sequence from small to large, obtaining a node sequence number l in the node set B by solving a formula (2), and taking the active power sensitivity of the node with the sequence number to the power transmission channel as the lower limit of an active sensitivity interval;
wherein j is the serial number of the jth node in B, sT.jIs the active sensitivity of node with serial number j in B to the active power of power transmission channel, Pj.dIs the lower limit of the active adjustable interval of the node with the sequence number j in the B, PjAnd the node with the sequence number j in the B has the active power under the S.
Further, by setting different overload coefficients, optimization calculation is performed by respectively taking the maximum active power of the transmission channel and the minimum active power of the transmission channel as optimization targets, taking the active power of the node in the N' as a variable, and taking the constraint conditions that the power grid is in active balance and the transmission equipment in the T is not overloaded before and after the equipment in the F is switched on and switched off, wherein the calculation formulas are respectively as follows:
in the formula, sT.nIs the active to power channel active sensitivity, P ', of node N in N'nIs an active variable of node N in N', PnIs the active power of node N in N' under S, Pn.u、Pn.dRespectively is the upper limit and the lower limit, s, of the active adjustable interval of the node N in the N' within the set time lengthloss.nSensitivity of node N in N' to net loss, st.nFor the active sensitivity of node N in N' to the active sensitivity of transmission equipment T in T, PtThe transmitting end of the power transmission equipment T in T under S is active, beta is an overload coefficient, VtFor the voltage of the transmitting node of the power transmission equipment T in T under S, It.maxFor long-term allowable current of power transmission equipment T in T，QtFor reactive power at the transmitting end of the power transmission equipment T in T under S, lambdat.fFor the active transfer ratio of the opening of the equipment F in F to the transmission equipment T in T, PfFor F, the sending end of the device F under S has power, Sf.nIs the active sensitivity of node N in N' to device F in F, It.max.1For a short time of the power transmission equipment T in T.
Further, the overload factor is in a set interval [ beta ]d,βu]The internal uniform sampling is carried out, the number of sampling points is
βd∈(0,1)，βuIs greater than 1, and the content of the active ingredient,
the larger the value, betadThe smaller the value, betauThe larger the value is, the more sigma is the relative error requirement of the set thermal stability limit.
Further, by setting different overload coefficients, optimization calculation is performed by respectively taking the maximum active power of the transmission channel and the minimum active power of the transmission channel as optimization targets, taking the active power of the node in the N' as a variable, and taking the constraint conditions that the power grid is in active balance and the transmission equipment in the T is not overloaded before and after the equipment in the F is switched on and switched off as constraint conditions, and the optimization calculation method comprises the following steps:
and performing power transmission channel active maximum optimization calculation and power transmission channel active minimum optimization calculation under different overload coefficients by adopting a multi-process parallel processing mode, wherein each process only executes a power transmission channel active maximum optimization or power transmission channel active minimum optimization calculation task under one overload coefficient.
Further, based on S, according to the active power of each node in N' corresponding to different overload coefficients under the condition of the maximum active power optimization and the minimum active power optimization of the power transmission channel, taking the voltage amplitude range and the reactive power regulation range of each node in the power grid as constraint conditions, performing load flow calculation before and after the device in F is turned on and off, including:
and performing flow calculation before and after the equipment is switched on and switched off under the conditions of maximum power optimization of the power transmission channel and minimum power optimization of the power transmission channel under different overload coefficients by adopting a multi-process parallel processing mode, wherein each process only executes a flow calculation task before or after the equipment is switched on and switched off under the conditions of maximum power optimization of the power transmission channel or minimum power optimization of the power transmission channel under one overload coefficient.
Further, the determining, based on the calculated current before disconnection and current after disconnection of the device in F and the active power of the power transmission channel before disconnection of the device in F of the power transmission device in T under different overload coefficients under two conditions, an upper limit and a lower limit of a thermal stability quota interval of the power transmission channel is specifically:
taking the maximum value of the active power of the transmission channel before the equipment is disconnected in the F under the condition that the active power of the transmission channel is optimized maximally, wherein the current of the transmission equipment in the T before the equipment is disconnected in the F is not more than the long-term allowable current, and the current after the disconnection is not more than the short-term allowable current, as the upper limit of the thermal stability quota interval of the transmission channel; and taking the maximum value of the active power of the transmission channel before the equipment is disconnected in the F under the condition that the active power of the transmission channel is minimum and optimized, wherein the current of the transmission equipment in the T is not more than the long-term allowable current before the equipment is disconnected in the F, and the current after the disconnection is not more than the short-term allowable current under all overload coefficients, as the lower limit of the thermal stability quota interval of the transmission channel.
An on-line calculation device for a transmission channel thermal stability quota interval comprises:
the data acquisition module is configured to acquire a power grid operation state S at the current moment, an active adjustable interval of a node in the active injection node set N, N within a set time length, a power transmission channel forming device set T, and a thermal stability check of the power transmission channel, and to check a long-term allowable current and a short-term allowable current of power transmission equipment in the expected on-off device set F, T;
the first calculation module is configured to establish a power flow equation of S, and according to the power flow equation of S, the active sensitivity of the node active power in N to the power transmission equipment in T and the active sensitivity to a power transmission channel are calculated, and the active transfer ratio of the device on/off in F to the power transmission equipment in T is calculated;
the active adjustable point screening module is configured to screen the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length under the S condition, so that a screened node set N' is obtained;
the second calculation module is configured to calculate the active sensitivity of the nodes in the N' to the network loss and the active sensitivity of the nodes in the F to the equipment in the F according to the load flow equation of the S;
a third calculation module, configured to, based on S, consider active sensitivity of a node in N ' to a power transmission channel, active sensitivity to power transmission equipment in T, sensitivity to network loss, and active sensitivity to equipment in F, and an active transfer ratio of equipment in F to power transmission equipment in T, and perform optimization calculation by setting different overload coefficients, respectively taking active maximum of the power transmission channel and active minimum of the power transmission channel as optimization targets, taking active power of the node in N ' as a variable, and taking power balance of a power grid and no overload of the power transmission equipment in T before and after the equipment in F is turned on and off as constraint conditions, so as to obtain active power of each node in N ' corresponding to different overload coefficients under the active maximum optimization condition of the power transmission channel and the active minimum optimization condition of the power transmission channel;
a fourth calculation module, configured to perform load flow calculation before and after the equipment in the F is switched on and off according to the active power of each node in the N' corresponding to different overload coefficients under the condition of maximum active power optimization and the condition of minimum active power optimization of the power transmission channel based on the S, with the voltage amplitude range and the reactive power regulation range of each node in the power grid as constraint conditions, and obtain the current before the equipment in the F, the current after the equipment is switched on and the active power of the power transmission channel before the equipment in the F is switched on of the power transmission equipment under different overload coefficients under two conditions, respectively;
and the transmission channel quota interval determining module is configured to determine the upper limit and the lower limit of a transmission channel thermal stability quota interval based on the calculated current before the device is disconnected in the F, the current after the device is disconnected in the F and the active power of the transmission channel before the device is disconnected in the F under the two conditions with different overload coefficients.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a power transmission channel thermally stable quota interval on-line calculation method.
A computing device, comprising: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing a method for power channel thermal stability quota interval on-line calculation.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the node active power adjustment candidate schemes corresponding to the upper limit and the lower limit of the thermal stability quota interval of the power transmission channel under different overload coefficients are determined by adopting a linear programming algorithm, so that the effectiveness of the node active power adjustment candidate schemes and the rapidity of the generation of the node active power adjustment candidate schemes are improved, then the node active power adjustment schemes are subjected to overload checking by adopting alternating current power flow, the upper limit and the lower limit of the thermal stability quota interval of the power transmission channel are determined, the precision of a calculation result is ensured, and the calculation efficiency is improved by adopting a multi-process parallel processing technology. The method meets the requirements of online application on real-time performance and accuracy, and has guiding significance for the dispatchers to fully master the safe and stable operation boundary of the power grid and efficiently utilize the power transmission capability of the power transmission channel.
Drawings
Fig. 1 is a flowchart of an online calculation method for a thermal stability quota interval of a power transmission channel according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
as shown in fig. 1, an online calculation method for a thermal stability quota interval of a power transmission channel includes the following steps:
step 1: the method comprises the steps of obtaining a power grid running state S at the current moment, obtaining an active adjustable interval of a node in an active injection node set N, N in a set time length (usually set to be 5 minutes), forming a device set T by a power transmission channel, and checking thermal stability of the power transmission channel to check the long-term allowable current and the short-term allowable current of power transmission equipment in an expected on-off device set F, T.
Step 2: and establishing a power flow equation of the S, and calculating the active sensitivity of the node active power in the N to the power transmission equipment in the T and the active sensitivity to a power transmission channel, and the active transfer ratio of the equipment disconnection in the F to the power transmission equipment in the T.
Wherein, the active transfer ratio of the device disconnection in F to the power transmission device in T refers to the ratio of the active change amount of the power transmission device in T after the device disconnection in F to the active of the disconnection device before the disconnection in S.
And step 3: and screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length under the S to obtain a screened node set N'.
The method specifically comprises the following steps:
1) determining an active sensitivity interval for screening nodes in the N;
sequencing nodes in a node set A with active power sensitivity of nodes in N to a power transmission channel larger than 0 according to the sequence of active power sensitivity from large to small, solving a formula (1) to obtain a node serial number k in A, and taking the active power sensitivity of the node of the serial number to the power transmission channel as the upper limit of an active power sensitivity interval;
wherein I is the serial number of the ith node in A, V is the voltage average value of the sending end node of the power transmission equipment in T under S, and ImaxThe sum of long-term allowable currents of the power transmission equipment in T, P is the active sum of the transmitting end of the power transmission equipment in T under S, Q is the reactive sum of the transmitting end of the power transmission equipment in T under S, ST.iIs the active sensitivity of node with serial number i in A to the active power of power transmission channel, Pi.uIs the upper limit of the active adjustable interval of the node with sequence number i in A, PiIs a node with sequence number i in AActive under S, α is a set parameter, greater than 1, typically set to 1.1;
sequencing nodes in a node set B aiming at nodes in N with active power sensitivity smaller than 0 to a power transmission channel, wherein the active power sensitivity is in a sequence from small to large, obtaining a node sequence number l in the node set B by solving a formula (2), and taking the active power sensitivity of the node with the sequence number to the power transmission channel as the lower limit of an active sensitivity interval;
wherein j is the serial number of the jth node in B, sT.jIs the active sensitivity of node with serial number j in B to the active power of power transmission channel, Pj.dIs the lower limit of the active adjustable interval of the node with the sequence number j in the B, PjThe node with the sequence number j in the B has active power under the S;
2) and removing the nodes of the active sensitivity of the nodes to the active sensitivity of the power transmission channel within the active sensitivity interval from the N.
And 4, step 4: and calculating the active sensitivity of the nodes in the N' to the network loss and the active sensitivity of the nodes in the F to the equipment in the F according to the load flow equation of the S.
And 5: based on S, in an active adjustable interval of a node in N 'within a set time, considering the active sensitivity of the node in N' to a power transmission channel, the active sensitivity to power transmission equipment in T, the sensitivity to network loss and the active sensitivity to equipment in F, and the active transfer ratio of the equipment in F to the power transmission equipment in T when the equipment is switched on and switched off, respectively taking the active maximum of the power transmission channel and the active minimum of the power transmission channel as optimization targets by setting different overload coefficients, taking the active power of the node in N 'as a variable, and taking the constraint conditions that the power grid is in active balance and the power transmission equipment in T is not overloaded before and after the equipment in F is switched on and switched off to carry out optimization calculation, so that the active power of each node in N' corresponding to different overload coefficients under the active maximum optimization condition of the power transmission channel and under the active minimum optimization condition of the power transmission channel are obtained.
The method comprises the following steps of setting different overload coefficients, respectively taking the maximum active power of a power transmission channel and the minimum active power of the power transmission channel as optimization targets, taking the active power of nodes in N' as variables, calculating constraint conditions of power grid active balance and no overload of power transmission equipment in T before and after the power transmission equipment in F is switched on and switched off, and performing optimization calculation according to the formula:
in the formula, sT.nIs the active to power channel active sensitivity, P ', of node N in N'nIs an active variable of node N in N', PnIs the active power of node N in N' under S, Pn.u、Pn.dRespectively an upper limit and a lower limit, s, of an active adjustable interval of a node N in the Nloss.nSensitivity of node N in N' to net loss, st.nFor the active sensitivity of node N in N' to the active sensitivity of transmission equipment T in T, PtThe transmitting end of the power transmission equipment T in T under S is active, beta is an overload coefficient, VtFor the voltage of the transmitting node of the power transmission equipment T in T under S, It.maxFor long-term allowable current, Q, of power transmission equipment T in TtFor reactive power at the transmitting end of the power transmission equipment T in T under S, lambdat.fFor the active transfer ratio of the opening of the equipment F in F to the transmission equipment T in T, PfFor F, the sending end of the device F under S has power, Sf.nIs the active sensitivity of node N in N' to device F in F, It.max.1For a short time of the power transmission equipment T in T.
The overload coefficient is in a set interval [ beta ]d,βu]The internal uniform sampling is carried out, the number of sampling points is
βdE (0,1), typically set to 0.9, betauGreater than 1, typically set to 1.1,
the larger the value, betadThe smaller the value, betauThe larger the value is, the more sigma is the relative error requirement of the set thermal stability limit.
And performing power transmission channel active maximum optimization calculation and power transmission channel active minimum optimization calculation under different overload coefficients by adopting a multi-process parallel processing mode, wherein each process only executes a power transmission channel active maximum optimization (or power transmission channel active minimum optimization) calculation task under one overload coefficient.
Step 6: based on S, dividing two conditions of power transmission channel active maximum optimization and power transmission channel active minimum optimization, aiming at different overload coefficients, adopting the corresponding active power of each node in N', calculating the voltage amplitude range and reactive power regulation range constraint of each node in the power grid, and performing load flow calculation before and after the disconnection of the equipment in F to obtain the current before the disconnection of the equipment in T, the current after the disconnection of the equipment in T and the active power of the power transmission channel before the disconnection of the equipment in F under different conditions and different overload coefficients.
The method comprises the steps that a multi-process parallel processing mode is adopted to carry out load flow calculation before and after the equipment is disconnected in the F under the condition of maximum power optimization of a power transmission channel and the condition of minimum power optimization of the power transmission channel under different overload coefficients, each process only executes one load flow calculation task before (or after) the equipment is disconnected in the F under the condition of maximum power optimization of the power transmission channel (or under the condition of minimum power optimization of the power transmission channel), wherein the number of the load flow calculation tasks before the equipment is disconnected in the F under the same overload coefficient is only two, one is the calculation task under the condition of maximum power optimization of the power transmission channel, and the other is the calculation task under the condition of minimum power optimization of the power transmission channel. And 7: and determining the upper limit and the lower limit of the thermal stability quota interval of the transmission channel based on the current before the device is disconnected and the current after the device is disconnected in the F and the active power of the transmission channel before the device is disconnected in the F under different conditions and different overload coefficients obtained by calculation.
The specific method comprises the following steps:
taking the maximum value of the active power of the transmission channel before the equipment is disconnected in the F under the condition that the current of the transmission equipment before the equipment is disconnected in the T under the condition of the maximum active power optimization of the transmission channel is not more than the long-term allowable current and the current after the disconnection is not more than the short-term allowable current as the upper limit of the interval of the thermal stability quota of the transmission channel, and taking the maximum value of the active power of the transmission channel before the equipment is disconnected in the F under the condition that the current of the transmission equipment before the equipment is disconnected in the T under the condition that the current of the transmission channel is not more than the long-term allowable current and the current after the disconnection is not more than the short-term allowable current as the lower limit of the interval of the thermal stability quota of the transmission channel.
And for the condition that the power flow calculation is not converged, the current of the power transmission equipment in T is larger than the long-term allowable current before the equipment is disconnected and is larger than the short-term allowable current after the equipment is disconnected.
Example 2:
the data acquisition module is configured to acquire a power grid operation state S at the current moment, an active adjustable interval of a node in the active injection node set N, N within a set time length, a power transmission channel forming device set T, and a thermal stability check of the power transmission channel, and to check a long-term allowable current and a short-term allowable current of power transmission equipment in the expected on-off device set F, T;
the first calculation module is configured to establish a power flow equation of S, and according to the power flow equation of S, the active sensitivity of the node active power in N to the power transmission equipment in T and the active sensitivity to a power transmission channel are calculated, and the active transfer ratio of the device on/off in F to the power transmission equipment in T is calculated;
the active adjustable point screening module is configured to screen the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length under the S condition, so that a screened node set N' is obtained;
the second calculation module is configured to calculate the active sensitivity of the nodes in the N' to the network loss and the active sensitivity of the nodes in the F to the equipment in the F according to the load flow equation of the S;
a third calculation module, configured to, based on S, consider active sensitivity of a node in N ' to a power transmission channel, active sensitivity to power transmission equipment in T, sensitivity to network loss, and active sensitivity to equipment in F, and an active transfer ratio of equipment in F to power transmission equipment in T, and perform optimization calculation by setting different overload coefficients, respectively taking active maximum of the power transmission channel and active minimum of the power transmission channel as optimization targets, taking active power of the node in N ' as a variable, and taking power balance of a power grid and no overload of the power transmission equipment in T before and after the equipment in F is turned on and off as constraint conditions, so as to obtain active power of each node in N ' corresponding to different overload coefficients under the active maximum optimization condition of the power transmission channel and the active minimum optimization condition of the power transmission channel;
a fourth calculation module, configured to perform load flow calculation before and after the equipment in the F is switched on and off according to the active power of each node in the N' corresponding to different overload coefficients under the condition of maximum active power optimization and the condition of minimum active power optimization of the power transmission channel based on the S, with the voltage amplitude range and the reactive power regulation range of each node in the power grid as constraint conditions, and obtain the current before the equipment in the F, the current after the equipment is switched on and the active power of the power transmission channel before the equipment in the F is switched on of the power transmission equipment under different overload coefficients under two conditions, respectively;
and the transmission channel quota interval determining module is configured to determine the upper limit and the lower limit of a transmission channel thermal stability quota interval based on the calculated current before the device is disconnected in the F, the current after the device is disconnected in the F and the active power of the transmission channel before the device is disconnected in the F under the two conditions with different overload coefficients.
The present invention also provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a method of on-line calculation of a power transmission channel thermal stability quota interval.
The present invention also provides a computing device comprising: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing a method for power channel thermal stability quota interval on-line calculation.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (12)
1. A method for calculating a thermal stability quota interval of a power transmission channel on line is characterized by comprising the following steps:
obtaining a power grid running state S at the current moment, an active adjustable interval of a node in an active injection node set N, N in a set time length, a power transmission channel forming device set T, and thermal stability checking of a power transmission channel, wherein long-term allowable current and short-term allowable current of power transmission equipment in an expected on-off device set F, T are obtained;
establishing a power flow equation of the S, and calculating the active sensitivity of the node active power in the N to the power transmission equipment in the T, the active sensitivity to a power transmission channel and the active transfer ratio of the equipment on/off in the F to the power transmission equipment in the T according to the power flow equation of the S;
screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length under the S condition to obtain a screened node set N';
according to the load flow equation of the S, calculating the active sensitivity of the nodes in the N' to the network loss and the active sensitivity of the nodes in the F to the equipment in the F;
based on S, in an active adjustable interval of a node in N 'within a set time length, considering active sensitivity of the node in N' to a power transmission channel, active sensitivity to power transmission equipment in T, sensitivity to network loss and active sensitivity to equipment in F, and an active transfer ratio of the equipment in F to the power transmission equipment in T when the equipment is switched on and off, respectively taking the active maximum of the power transmission channel and the active minimum of the power transmission channel as optimization targets by setting different overload coefficients, taking the active power of the node in N 'as a variable, and taking the constraint conditions of power grid active balance and the condition that the power transmission equipment in T is not overloaded before and after the equipment in F is switched on and switched off as constraint conditions to carry out optimization calculation to obtain active power of each node in N' corresponding to different overload coefficients under the active maximum optimization condition of the power transmission channel and the active minimum optimization condition of the power transmission channel;
based on S, according to the active power of each node in N' corresponding to different overload coefficients under the condition of maximum active power optimization and the condition of minimum active power optimization of a power transmission channel, taking the voltage amplitude range and the reactive power regulation range of each node in a power grid as constraint conditions, carrying out load flow calculation before disconnection and after disconnection of the equipment in F, and respectively obtaining the current before disconnection of the equipment in F, the current after disconnection of the equipment in T and the active power of the power transmission channel before disconnection of the equipment in F under different overload coefficients under two conditions;
and determining the upper limit and the lower limit of the thermal stability quota interval of the transmission channel based on the calculated current before the disconnection of the equipment in the F, the current after the disconnection of the equipment in the T and the active power of the transmission channel before the disconnection of the equipment in the F under different overload coefficients under two conditions.
2. The method according to claim 1, characterized in that the active transfer ratio of equipment disconnection in F to transmission equipment in T is the ratio of the amount of change in active power of the transmission equipment in T after equipment disconnection in F to the active power of the transmission equipment in T before disconnection by the disconnection equipment in S.
3. The method according to claim 1, wherein the screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to the power transmission channel and the active adjustable interval of the nodes in the N within a set time period under the condition of S to obtain a screened node set N' comprises:
determining an active sensitivity interval for screening the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length;
and removing the nodes of the active power sensitivity of the nodes to the active power sensitivity of the power transmission channel in the active power sensitivity interval from the N to obtain a screened node set N'.
4. The method according to claim 3, wherein the determining an active sensitivity interval for screening the nodes in N according to the power flow of the power transmission equipment in T, the long-term allowable current of the power transmission equipment in T, the active power of the nodes in N, the active sensitivity of the active power of the nodes in N to the power transmission channel in N and the active adjustable interval of the nodes in N within a set time length comprises the following steps:
sequencing nodes in a node set A with active power sensitivity of nodes in N to a power transmission channel larger than 0 according to the sequence of active power sensitivity from large to small, solving a formula (1) to obtain a node serial number k in A, and taking the active power sensitivity of the node of the serial number to the power transmission channel as the upper limit of an active power sensitivity interval;
wherein I is the serial number of the ith node in A, V is the voltage average value of the sending end node of the power transmission equipment in T under S, and ImaxThe sum of long-term allowable currents of the power transmission equipment in T, P is the active sum of the transmitting end of the power transmission equipment in T under S, Q is the reactive sum of the transmitting end of the power transmission equipment in T under S, ST.iIs the active sensitivity of node with serial number i in A to the active power of power transmission channel, Pi.uIs the upper limit of the active adjustable interval of the node with sequence number i in A, PiThe active power of the node with the serial number i in the A under the S is shown, and alpha is a set parameter and is larger than 1;
sequencing nodes in a node set B aiming at nodes in N with active power sensitivity smaller than 0 to a power transmission channel, wherein the active power sensitivity is in a sequence from small to large, obtaining a node sequence number l in the node set B by solving a formula (2), and taking the active power sensitivity of the node with the sequence number to the power transmission channel as the lower limit of an active sensitivity interval;
wherein j is the serial number of the jth node in B, sT.jIs the active sensitivity of node with serial number j in B to the active power of power transmission channel, Pj.dIs the lower limit of the active adjustable interval of the node with the sequence number j in the B, PjAnd the node with the sequence number j in the B has the active power under the S.
5. The method according to claim 1, wherein different overload coefficients are set, optimization calculation is performed by taking the maximum active power of the transmission channel and the minimum active power of the transmission channel as optimization targets, taking the active power of the node in N' as a variable, and taking constraint conditions that the power grid is in active balance and the transmission equipment in T is not overloaded before and after the equipment in F is disconnected as follows:
in the formula, sT.nIs the active to power channel active sensitivity, P ', of node N in N'nIs an active variable of node N in N', PnIs the active power of node N in N' under S, Pn.u、Pn.dRespectively is the upper limit and the lower limit, s, of the active adjustable interval of the node N in the N' within the set time lengthloss.nSensitivity of node N in N' to net loss, st.nFor the active sensitivity of node N in N' to the active sensitivity of transmission equipment T in T, PtThe transmitting end of the power transmission equipment T in T under S is active, beta is an overload coefficient, VtFor the voltage of the transmitting node of the power transmission equipment T in T under S, It.maxFor long-term allowable current, Q, of power transmission equipment T in TtFor reactive power at the transmitting end of the power transmission equipment T in T under S, lambdat.fFor the active transfer ratio of the opening of the equipment F in F to the transmission equipment T in T, PfFor devices F in F under SSending end active, sf.nIs the active sensitivity of node N in N' to device F in F, It.max.1For a short time of the power transmission equipment T in T.
6. Method according to claim 5, characterized in that the overload factor is in a set interval [ β ]d，βu]The internal uniform sampling is carried out, the number of sampling points is
βd∈(0，1)，βuIs greater than 1, and the content of the active ingredient,
the larger the value, betadThe smaller the value, betauThe larger the value is, the more sigma is the relative error requirement of the set thermal stability limit.
7. The method according to claim 1, wherein the optimization calculation is performed by setting different overload coefficients, respectively taking the maximum power of the transmission channel and the minimum power of the transmission channel as optimization targets, taking the active power of the node in N' as a variable, and taking the constraint conditions that the power grid is in active balance and the transmission equipment in T is not overloaded before and after the equipment in F is disconnected, and comprises the following steps:
and performing power transmission channel active maximum optimization calculation and power transmission channel active minimum optimization calculation under different overload coefficients by adopting a multi-process parallel processing mode, wherein each process only executes a power transmission channel active maximum optimization or power transmission channel active minimum optimization calculation task under one overload coefficient.
8. The method according to claim 1, wherein based on S, the calculation of the power flow before and after the disconnection of the device in F is performed according to the active power of each node in N' corresponding to different overload coefficients under the condition of maximum active power optimization and the condition of minimum active power optimization of the transmission channel, with the voltage amplitude range and the reactive power regulation range of each node in the power grid as constraint conditions, and includes:
and performing flow calculation before and after the equipment is switched on and switched off under the conditions of maximum power optimization of the power transmission channel and minimum power optimization of the power transmission channel under different overload coefficients by adopting a multi-process parallel processing mode, wherein each process only executes a flow calculation task before or after the equipment is switched on and switched off under the conditions of maximum power optimization of the power transmission channel or minimum power optimization of the power transmission channel under one overload coefficient.
9. The method according to claim 1, wherein the upper limit and the lower limit of the interval of the thermal stability quota of the transmission channel are determined based on the calculated current before the disconnection of the equipment in F, the current after the disconnection of the equipment in T and the active power of the transmission channel before the disconnection of the equipment in F under different overload coefficients under two conditions, specifically:
taking the maximum value of the active power of the transmission channel before the equipment is disconnected in the F under the condition that the active power of the transmission channel is optimized maximally, wherein the current of the transmission equipment in the T before the equipment is disconnected in the F is not more than the long-term allowable current, and the current after the disconnection is not more than the short-term allowable current, as the upper limit of the thermal stability quota interval of the transmission channel; and taking the maximum value of the active power of the transmission channel before the equipment is disconnected in the F under the condition that the active power of the transmission channel is minimum and optimized, wherein the current of the transmission equipment in the T is not more than the long-term allowable current before the equipment is disconnected in the F, and the current after the disconnection is not more than the short-term allowable current under all overload coefficients, as the lower limit of the thermal stability quota interval of the transmission channel.
10. An on-line calculation device for a transmission channel thermal stability quota interval is characterized by comprising:
the data acquisition module is configured to acquire a power grid operation state S at the current moment, an active adjustable interval of a node in the active injection node set N, N within a set time length, a power transmission channel forming device set T, and a thermal stability check of the power transmission channel, and to check a long-term allowable current and a short-term allowable current of power transmission equipment in the expected on-off device set F, T;
the first calculation module is configured to establish a power flow equation of S, and according to the power flow equation of S, the active sensitivity of the node active power in N to the power transmission equipment in T and the active sensitivity to a power transmission channel are calculated, and the active transfer ratio of the device on/off in F to the power transmission equipment in T is calculated;
the active adjustable point screening module is configured to screen the nodes in the N according to the power flow of the power transmission equipment in the T, the long-term allowable current of the power transmission equipment in the T, the active power of the nodes in the N, the active sensitivity of the active power of the nodes in the N to a power transmission channel and the active adjustable interval of the nodes in the N within a set time length under the S condition, so that a screened node set N' is obtained;
the second calculation module is configured to calculate the active sensitivity of the nodes in the N' to the network loss and the active sensitivity of the nodes in the F to the equipment in the F according to the load flow equation of the S;
a third calculation module, configured to, based on S, consider active sensitivity of a node in N ' to a power transmission channel, active sensitivity to power transmission equipment in T, sensitivity to network loss, and active sensitivity to equipment in F, and an active transfer ratio of equipment in F to power transmission equipment in T, and perform optimization calculation by setting different overload coefficients, respectively taking active maximum of the power transmission channel and active minimum of the power transmission channel as optimization targets, taking active power of the node in N ' as a variable, and taking power balance of a power grid and no overload of the power transmission equipment in T before and after the equipment in F is turned on and off as constraint conditions, so as to obtain active power of each node in N ' corresponding to different overload coefficients under the active maximum optimization condition of the power transmission channel and the active minimum optimization condition of the power transmission channel;
a fourth calculation module, configured to perform load flow calculation before and after the equipment in the F is switched on and off according to the active power of each node in the N' corresponding to different overload coefficients under the condition of maximum active power optimization and the condition of minimum active power optimization of the power transmission channel based on the S, with the voltage amplitude range and the reactive power regulation range of each node in the power grid as constraint conditions, and obtain the current before the equipment in the F, the current after the equipment is switched on and the active power of the power transmission channel before the equipment in the F is switched on of the power transmission equipment under different overload coefficients under two conditions, respectively;
and the transmission channel quota interval determining module is configured to determine the upper limit and the lower limit of a transmission channel thermal stability quota interval based on the calculated current before the device is disconnected in the F, the current after the device is disconnected in the F and the active power of the transmission channel before the device is disconnected in the F under the two conditions with different overload coefficients.
11. A computer readable storage medium storing one or more programs, characterized in that: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-9.
12. A computing device, characterized by: the method comprises the following steps: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-9.
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