CN110768248B - Power transmission and distribution price verification method and device based on maximum utilization rate of power transmission equipment - Google Patents
Power transmission and distribution price verification method and device based on maximum utilization rate of power transmission equipment Download PDFInfo
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Abstract
The invention discloses a method and a device for checking and determining the transmission and distribution price based on the maximum utilization rate of transmission equipment, wherein the method comprises the following steps: step S1, selecting a system state corresponding to the maximum utilization rate of each power transmission device as a system state for checking the power transmission and distribution price, and determining the utilized cost of each power transmission device based on the maximum utilization rate of each power transmission device; step S2, based on the DC power flow tracking, the utilized cost of each power transmission equipment is allocated according to the contribution degree of each load to the maximum power flow of the power transmission equipment; and step S3, based on marginal cost pricing theory, calculating the time required by the power transmission equipment from the current state to the rated capacity of the power transmission equipment at a preset load increase rate before and after the new load is added by taking the rated capacity of each power transmission equipment as a boundary in a differential mode, and converting the change of the investment and extension time of the power transmission equipment into the change of the investment and extension cost of the power grid caused by increasing unit load by the load node so as to share the unutilized cost.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a power transmission and distribution price verification method and device based on the maximum utilization rate of power transmission equipment.
Background
At present, the postage stamp method is generally adopted for checking the price of power transmission and distribution, and the power transmission and distribution cost is distributed to the load side according to the voltage grade, however, the method is difficult to reflect the use degree of the loads with different positions and different power utilization characteristics on the power grid assets, and meanwhile, the specific use degree of each load on the power grid assets is difficult to determine due to the inherent characteristics of nonlinearity, untraceability and the like of the network tide.
In addition, in some theoretical researches, various methods for checking and determining the power transmission and distribution prices are also proposed, including the megawatt kilometer method, the contract path method and the like, but in the methods, the utilization rate of power grid equipment, the power utilization characteristics of users and the influence of the positions of nodes on network assets are not considered, and the defects that the utilization degree of power grids by users at different positions is difficult to reflect, the utilization rate of power transmission equipment is insufficient and the like exist.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a power transmission and distribution price verification method and device based on the maximum utilization rate of power transmission equipment, so as to reflect the use degree of users in different areas to a power grid, guide reasonable site selection of a power plant and a load by using an economic signal of the power price, promote scientific investment of the power grid and promote effective allocation of resources.
In order to achieve the above object, the present invention provides a method for checking the power transmission and distribution price based on the maximum utilization rate of power transmission equipment, comprising the following steps:
step S1, selecting a system state corresponding to the maximum utilization rate of each power transmission device as a system state for power transmission and distribution price check timing, and determining the utilized cost of each power transmission device based on the maximum utilization rate of each power transmission device;
step S2, based on the DC power flow tracking, the utilized cost of each power transmission equipment is allocated according to the contribution degree of each load to the maximum power flow of the power transmission equipment;
and step S3, based on marginal cost pricing theory, calculating the time required by the power transmission equipment from the current state to the rated capacity of the power transmission equipment at a preset load increase rate before and after the new load is added by taking the rated capacity of each power transmission equipment as a boundary in a differential mode, and converting the change of the investment and extension time of the power transmission equipment into the change of the investment and extension cost of the power grid caused by increasing unit load by the load node so as to share the unutilized cost.
Preferably, in step S1, the utilization rate of each power transmission device is determined based on the grid parameters and the power generation and load parameters of each selected state, and the system state corresponding to the maximum utilization rate of each power transmission device is selected as the system state used for the power transmission and distribution rate check.
Preferably, in step S2, to avoid the influence of the selected single balancing node on the sharing result, the contribution of the load to the power flow on the line adopts a generalized load transfer distribution factor, and all the generator sets in the network are used as the balancing nodes of the unbalanced power on the load side and are adjusted in equal proportion.
Preferably, the step S2 further includes:
step S201, calculating generalized load transfer distribution factors in each system state, and determining the contribution degree of each load to each line load flow in the selected system state;
step S202, according to the contribution degree of each load power to the peak load of the power transmission equipment, the used cost of each power transmission equipment is distributed to each load node.
Preferably, in step S202, the used cost of each power transmission equipment is distributed to each load node by using a postage stamp method according to the contribution degree of each load power to the peak load of the power transmission equipment.
Preferably, the step S3 further includes:
step S300, taking the rated capacity of each power transmission device as a boundary, calculating the influence of the increased power of the load of each node on the power transmission device based on the generalized load transfer distribution factor, and calculating the capacity expansion time of the power transmission device before and after the power of the load node is increased;
step S301, calculating a difference between line costs before and after the load node power change to allocate the unused cost.
Preferably, step S300 further comprises:
step S300a of calculating, for the power transmitting apparatus i, a time required for the power flow thereof to increase to a rated capacity at a predetermined rate in the n state;
step S300b, increasing load Δ P at load node jjThen, the power flow change amount Δ P of the power transmission device i caused by the newly added load is calculatedi l；
Step S300c, based on rated capacity P of power transmission equipment ii maxAnd the tidal current value P of the power transmission equipment i in the n statei L_nAnd the power flow variation delta P of the power transmission equipment i caused by newly added loadi lThe time required for power transmission equipment i to reach rated capacity is recalculated.
Preferably, in step S301, the net present value is used to calculate the difference between the line cost before and after the node power change, so as to distribute the unused cost.
Preferably, step S301 further includes:
step S301a, calculating the net current value of the power transmission equipment i before the load node j adds the load;
step S301b, calculating the net current value of the power transmission equipment i after the load node j adds the load;
in step S301c, the difference between the net present values of the power transmission equipment i before and after the load node j adds the load is calculated.
In order to achieve the above object, the present invention further provides a power transmission and distribution price verification device based on the maximum utilization rate of power transmission equipment, including:
the system state determining unit is used for selecting the corresponding system state when the utilization rate of each power transmission device is maximum as the system state for power transmission and distribution price check timing, and determining the utilized cost of each power transmission device based on the maximum utilization rate of each power transmission device;
the utilized cost allocation unit allocates the utilized cost of each power transmission device according to the contribution degree of each load to the maximum power flow of the power transmission device based on direct current power flow tracking;
and the unutilized cost allocation unit calculates the time required by the power transmission equipment from the current state to the rated capacity of the power transmission equipment at a preset load increase rate before and after the newly increased load by taking the rated capacity of each power transmission equipment as a boundary in a differential mode based on a marginal cost pricing theory, and converts the change of the investment and extension time of the power transmission equipment into the change of the investment and extension cost of the power grid caused by increasing unit load by the load node so as to allocate the unutilized cost.
Compared with the prior art, the power transmission and distribution price checking method and the device based on the maximum utilization rate of the power transmission equipment share the utilized cost based on the contribution degree of the load to the peak load of the power transmission equipment, share the unused cost based on the use degree of the newly added load nodes to the unused capacity of the power transmission equipment and adopt the marginal cost pricing idea, and overcome the defects that the use degree of users at different positions to a power grid and the utilization rate of the power transmission equipment are difficult to reflect by the conventional power transmission and distribution price checking method.
Drawings
Fig. 1 is a flowchart illustrating a method for checking a transmission and distribution price based on a maximum utilization rate of power transmission equipment according to the present invention;
fig. 2 is a system architecture diagram of a transmission and distribution price verification device based on the maximum utilization rate of power transmission equipment according to the present invention;
fig. 3 is a network system diagram according to an embodiment of the invention.
Detailed Description
Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a flowchart illustrating a method for checking a transmission and distribution price based on a maximum utilization rate of power transmission equipment according to the present invention. As shown in fig. 1, the present invention provides a method for checking the transmission and distribution price based on the maximum utilization rate of power transmission equipment, which includes the following steps:
step S1, selecting a system state corresponding to the maximum utilization rate of each power transmission apparatus as the system state of the power transmission and distribution price verification method, and determining the used cost of each power transmission apparatus based on the maximum utilization rate of each power transmission apparatus.
In the specific embodiment of the invention, the utilization rate of each power transmission device is determined based on the power grid parameters (reactance and rated capacity of each power transmission device) and the power generation and load parameters (power generation and load power) of the system state corresponding to the maximum utilization rate of each power transmission device, and the system state corresponding to the maximum utilization rate of each power transmission device is selected as the system state for power transmission and distribution price check timing. Specifically, for the device i, the state corresponding to the maximum utilization rate is n, and then the maximum utilization rate of the power transmission device i is:
where N is the selected system state, N is the selected set of system states, PiFor the power rating of the power transmission equipment,
and the line tide current value of the power transmission equipment in the system state n is shown.
In the invention, the cost of each power transmission device is divided into the utilized cost and the non-utilized cost based on the maximum utilization rate of each power transmission device, wherein the utilized cost of each power transmission device is calculated according to the following formula:
wherein A isiIn order to account for the cost of the power transmission equipment i,
is the cost of the power transmission equipment i already in use.
Step S2 is to allocate the used cost of each power transmission facility according to the degree of contribution of each load to the maximum power flow of the power transmission facility, based on the dc power flow tracking.
In the invention, the method for allocating the used cost of each power transmission device is based on direct current power flow tracking, and allocates the contribution degree of each load to the maximum power flow of the device, and meanwhile, in order to avoid the influence of a selected single balance node on the allocation result, the contribution degree of the load to the power flow on the line adopts a generalized load transfer distribution factor, all generator sets in the network are used as balance nodes of unbalanced power on the load side, and the adjustment is carried out in equal proportion.
Specifically, step S2 further includes:
step S201, calculating generalized load transfer distribution factors in each system state, and determining the contribution degree of each load to each line load flow in the selected system state.
That is, in step S201, the generalized load transfer distribution factor in each system state is calculated to determine the load flow influence on the line in each selected state. Specifically, a balance node is selected at will, and a power generation transfer distribution factor of a power generation unit of each node in the local power network is calculated, in a specific embodiment of the present invention, a calculation formula of the power generation transfer distribution factor of the node k to the line ij is as follows:
Xik、Xjkthe elements, x, of the reactance matrix in the ith row, the kth column and the jth row, the kth column respectivelyijIs the impedance of line ij.
In order to eliminate the influence of increasing unit power to any node by a selected single balance node on the power flow of each line and ensure the reasonable allocation of the cost of power transmission equipment, the invention adopts a generalized load transfer distribution factor to determine the use condition of each load to the line, supposing that the unbalance amount of unit power added to the load node is adjusted by each generator set according to equal proportion to carry out power balance, namely each generator set is selected as a balance node of unbalanced power of a load side, and the specific calculation formula is as follows:
wherein,
increasing the contribution degree of unit load to the line ij at the balance node; r is a selected balance node; l is the number of system load nodes; plIs the power of the load node;
and increasing unit power for the load node, and increasing power of the power generation node in an equal proportion to meet the influence of the load node l on the line ij when the power balance is met.
Step S202, according to the contribution degree of each load power to the peak load of the power transmission equipment, the used cost of each power transmission equipment is distributed to each load node.
In step S202, the used cost of each power transmission equipment is allocated to each load node by a postal ticket method according to the contribution degree of each load power to the peak load of the power transmission equipment. In particular, the utilized cost for the power transmission apparatus i
The calculation formula of (a) is as follows:
wherein A isiIn order to account for the cost of the power transmission equipment i,
is the utilized cost of the power transmission equipment i.
The calculation formula for apportioning the utilized cost of the power transmission equipment i to the node j is as follows:
wherein,
the element of the jth row and ith column of the generalized load transfer distribution factor of the system in the n state,
the power consumption of the load node j in the system state n is achieved.
And step S3, based on marginal cost pricing theory, adopting a difference mode, taking the rated capacity of each power transmission device as a boundary, calculating the influence of the increased power of each node load on the power transmission device based on generalized load transfer distribution factors, calculating the time required by the power transmission device from the current state to the rated capacity of the device at a certain load increase rate before and after a new load is added, and converting the change of the investment and extension time of the power transmission device into the change of the investment and extension cost of the power grid caused by the increase of unit load of the load node through a net present value method so as to share the unutilized cost.
Specifically, step S3 further includes:
and step S300, taking the rated capacity of each power transmission device as a boundary, calculating the influence of the increased power of the load of each node on the power transmission device based on the generalized load transfer distribution factor, and calculating the capacity expansion time of the power transmission device before and after the power of the load node is increased.
Specifically, step S300 further includes:
step S300a, for the power transmission equipment i, calculating a time required for the power flow to increase to a rated capacity at a certain rate in the n state, where a specific process may be represented by the following formula:
wherein,
for the rated capacity of the power transmission equipment i,
is the power flow value of the power transmission equipment i in the n state, rjIs the load growth rate, T, of node jiThe time required for the power flow of the power transmission equipment to increase from the current state to the rated capacity, namely the capacity expansion time.
According to the formula, the required power grid extension time from the current state to the rated capacity of the power transmission equipment i is as follows:
step S300b, increasing load Δ P at load node jjThen, the power flow variation of the power transmission device i caused by the newly added load is calculated
The calculation formula is as follows:
step S300c, based on rated capacity of power transmission equipment i
Tidal current value of power transmission equipment i in n state
And the change of the power flow of the power transmission equipment i caused by newly added load
Recalculating the time required for power transmission equipment i to reach rated capacity, i.e. the new capacity expansion time Ti,new。
Step S301, calculating the difference of line cost before and after the node power change by adopting a net present value method so as to share the unused cost.
Specifically, step S301 further includes:
step S301a, which is to calculate the net present value of the power transmission equipment i before the node j adds the load:
wherein d is the discount rate, MjAnd (4) the net current value of the load node j is distributed to the unused cost of the power transmission equipment i.
Step S301b, calculating the net present value of the device i after the node j newly adds the load:
step S301c, calculating the difference between net present values of the devices i before and after the node j adds the load:
mj＝Mj,new-Mj
mjand (4) distributing the cost of the unused cost of the power transmission equipment i to the load node j.
Fig. 2 is a system architecture diagram of a transmission and distribution price verification device based on the maximum utilization rate of power transmission equipment. As shown in fig. 2, the present invention provides a power transmission and distribution price verification apparatus based on the maximum utilization rate of power transmission equipment, including:
the system state determination unit 201 is configured to select a system state corresponding to the maximum utilization rate of each power transmission apparatus as a system state for power transmission and distribution rate check timing, and determine a used cost of each power transmission apparatus based on the utilization rate of each power transmission apparatus.
In the embodiment of the present invention, the system state determining unit 201 determines the utilization rate of each power transmission device based on the power grid parameters and the power generation and load parameters of each selected state, and selects the system state corresponding to the maximum utilization rate of each power transmission device as the system state for the power transmission and distribution rate check timing. Specifically, for the device i, if the state corresponding to the maximum utilization rate is n, the maximum utilization rate of the power transmission device i is:
where N is the selected system state, N is the selected set of system states, PiFor the power rating of the power transmission equipment,
and the line tide current value of the power transmission equipment in the system state n is shown.
In the present invention, the system state determination unit 201 also divides the cost of each power transmission apparatus into a used cost and an unused cost based on the maximum utilization rate thereof, wherein the calculation formula of the used cost of each power transmission apparatus is as follows:
wherein A isiIn order to account for the cost of the power transmission equipment i,
is the cost of the power transmission equipment i already in use.
The used cost allocation unit 202 allocates the used cost of each power transmission equipment according to the contribution degree of each load to the maximum power flow of the power transmission equipment based on the dc power flow tracking.
In the invention, the method for allocating the used cost of each power transmission device is based on direct current power flow tracking, and allocates the contribution degree of each load to the maximum power flow of the device, and meanwhile, in order to avoid the influence of a selected single balance node on the allocation result, the contribution degree of the load to the power flow on the line adopts a generalized load transfer distribution factor, all generator sets in the network are used as balance nodes of unbalanced power on the load side, and the adjustment is carried out in equal proportion.
Specifically, the utilized cost apportionment unit 202 further includes
And the generalized load transfer distribution factor calculation module is used for calculating generalized load transfer distribution factors in each system state and determining the contribution degree of each load to each line load flow in the selected system state.
That is, the generalized load transfer distribution factor calculation module calculates the generalized load transfer distribution factor in each system state to determine the load flow influence on the line in each selected state. Specifically, a balance node is arbitrarily selected, and a power generation transfer distribution factor of the network is calculated, in the specific embodiment of the present invention, a calculation formula of a power generation transfer distribution factor of a node k to a line ij is as follows:
Xik、Xjkthe elements, x, of the reactance matrix in the ith row, the kth column and the jth row, the kth column respectivelyijIs the impedance of line ij.
In order to eliminate the influence of increasing unit power to any node by a selected single balance node on the power flow of each line and ensure the reasonable allocation of the cost of power transmission equipment, the invention adopts a generalized load transfer distribution factor to determine the use condition of each load to the line, supposing that the unbalance amount of unit power added to the load node is adjusted by each generator set according to equal proportion to carry out power balance, namely each generator set is selected as a balance node of unbalanced power of a load side, and the specific calculation formula is as follows:
wherein,
increasing the contribution degree of unit load to the line ij at the balance node; r is a selected balance node; l is the number of system load nodes; plIs the power of the load node;
and increasing unit power for the load node, and increasing power of the power generation node in an equal proportion to meet the influence of the load node l on the line ij when the power balance is met.
And the utilized cost allocation module is used for allocating the utilized cost of each power transmission device to each load node according to the contribution degree of each load power to the peak load of the power transmission device.
Specifically, the used cost allocation module allocates the used cost of each power transmission device to each load node by using a postage stamp method according to the contribution degree of each load power to the peak load of the power transmission device. In particular, the utilized cost for the power transmission apparatus i
The calculation formula of (a) is as follows:
wherein A isiIn order to account for the cost of the power transmission equipment i,
is the utilized cost of the power transmission equipment i.
The calculation formula for apportioning the utilized cost of the power transmission equipment i to the node j is as follows:
wherein,
the element of the jth row and ith column of the generalized load transfer distribution factor of the system in the n state,
the power consumption of the load node j in the system state n is achieved.
The unutilized cost allocation unit 203 calculates the influence of the load increase power of each node on the power transmission equipment by taking the rated capacity of each power transmission equipment as a boundary and based on a generalized load transfer distribution factor in a differential mode based on a marginal cost pricing theory, calculates the time required by the power transmission equipment from the current state to the rated capacity of the equipment at a certain load increase rate before and after the new load is added, and converts the change of the investment extension time of the power transmission equipment into the change of the investment extension cost of the power grid caused by the increase of the unit load of the load node by a net present value method so as to allocate the unutilized cost.
Specifically, the unutilized cost apportioning unit 203 further includes:
and the capacity expansion time calculation module is used for calculating the influence of the load increased power of each node on the power transmission equipment based on the generalized load transfer distribution factor by taking the rated capacity of each power transmission equipment as a boundary, and calculating the capacity expansion time of the power transmission equipment before and after the load node increases the power.
Specifically, the capacity expansion time calculation module is specifically configured to:
for the power transmission equipment i, calculating the time required for the power flow to increase to rated capacity at a certain rate in the n state, wherein the specific process can be represented by the following formula:
wherein,
for the rated capacity of the power transmission equipment i,
is the power flow value of the power transmission equipment i in the n state, rjIs the load growth rate, T, of node jiThe time required for the power flow of the power transmission equipment to increase from the current state to the rated capacity, namely the capacity expansion time.
According to the formula, the required power grid extension time from the current state to the rated capacity of the power transmission equipment i is as follows:
increasing the load Δ P at load node jjThen, the amount of change in the power flow of the power transmission equipment i caused by the newly added load is calculated
The calculation formula is as follows:
according to rated capacity of power transmission equipment i
Power flow value of power transmission equipment i in n state
And the change of the power flow of the power transmission equipment i caused by newly added load
Recalculating the time required for power transmission equipment i to reach rated capacity, i.e. the new capacity expansion time Ti,new。
And the unutilized cost allocation module is used for calculating the difference of the line cost before and after the node power change by adopting a net present value method so as to allocate the unutilized cost.
The unutilized cost apportionment module is specifically configured to:
calculating the net current value of the power transmission equipment i before the node j newly adds the load:
wherein d is the discount rate, MjAnd (4) the net current value of the load node j is distributed to the unused cost of the power transmission equipment i.
Calculating the net present value of the equipment i after the node j has the newly added load:
calculating the difference of net current values of the devices i before and after the node j newly increases the load:
mj＝Mj,new-Mj
mjand (4) distributing the cost of the unused cost of the power transmission equipment i to the load node j.
Examples
As shown in fig. 3, in this embodiment, a method for pricing power transmission based on maximum utilization of power transmission equipment includes the following steps:
(1) obtaining power generation, load and network parameters, the network system diagram of the embodiment is shown in FIG. 3, and the grid parameters and load data are shown in the following table (reference value: S)B＝100MVA，VB110kV), and calculating the utilization rate of each power transmission line, the calculation formula is as follows:
where n is a system state corresponding to the maximum utilization rate of the power transmission equipment i, and only one state, P, is selected in this embodimentiFor the power rating of the power transmission equipment,
and the line load flow value of the power transmission equipment in the system state n is obtained.
TABLE 1 three node example data
(2) Assuming that the cost of each line is 100 ten thousand yuan, the utilized cost of each power transmission device is determined based on the utilization rate of each power transmission device, and the calculation formula is as follows:
wherein A isiIn order to account for the cost of the power transmission equipment i,
is the utilized cost of the power transmission equipment i. The available costs of the L1, L2, and L3 lines are 50 ten thousand yuan, 62.5 ten thousand yuan, and 12.5 ten thousand yuan in this order.
3) Calculating the generalized load transfer distribution factor of each load node:
wherein, Xik、XjkThe elements, x, of the reactance matrix in the ith row, the kth column and the jth row, the kth column respectivelyijIs the impedance of the line ij and,
increasing the contribution degree of unit load to the line ij at the balance node; r is a selected balance node; l is the number of system load nodes; plIs the power of the load node;
is the breadth of the load nodeDefining a load shift distribution factor. The generalized load transfer distribution factors of the BUS1 node load pairs L1, L2 and L3 are obtained to be 2/3, 1/3 and 1/3 in sequence; the generalized load transfer distribution factors of the BUS2 node load pairs L1, L2 and L3 are 1/3, 1/3 and 2/3 in sequence.
(4) Based on the contribution degree of each load node to the peak load of the power transmission equipment, the utilized cost is apportioned, and the calculation formula is as follows:
wherein A isiIn order to account for the cost of the power transmission equipment i,
the cost of the power transmission equipment i;
the element in the jth row and ith column of the generalized load transfer distribution factor,
the power consumption of the load node j in the system state n is achieved. The used costs of the power transmission equipment L1, L2 and L3 required to be shared to obtain the load of BUS1 are 25 ten thousand, 12.5 ten thousand and 4.17 ten thousand, and the rate related to the used cost of the finally obtained BUS1 is (25+12.5+4.17)/15 which is 2.778 ten thousand yuan/MW; similarly, the rate of BUS2 associated with the cost of utilization may be calculated to be 2.776 ten thousand yuan/MW.
(5) Assuming that the load has a certain increase rate, set as 10%, calculating the time required for the power flow of the power transmission equipment to increase from the current state to the rated capacity:
wherein,
for the rated capacity of the power transmission equipment i,
is the power flow value of the power transmission equipment i in the n state, rjIs the load growth rate, T, of node jiThe time required for the power flow of the power transmission equipment to increase from the current state to the rated capacity, namely the capacity expansion time. The available power transmission facilities L1, L2, and L3 have an expansion time of 7.3 years, 5 years, and 21.9 years.
Increasing the load Δ P at load node jjTaking Δ PjCalculating the current variation of the power transmission equipment i caused by the newly added load as 1
And on the basis of the calculated expansion time T, the time required for the power transmission equipment i to reach the rated capacity is calculated againi,new。
Increasing load on BUS1 to obtain new capacity expansion time of power transmission equipment L1, L2 and L3 of 6.9 years, 4.8 years and 22.5 years; the new capacity expansion time of power transmission equipment L1, L2 and L3 is 7.1 years, 4.6 years and 21.1 years after the load is added to BUS 2.
(6) And calculating the net current value of the equipment i caused before and after the node j increases the load, wherein the difference value of the net current values before and after the load is increased is the cost of the unused part of the recovered power transmission equipment i of the node j.
mj＝Mj,new-Mj
Wherein d is the conversion rate, 5%, MjNet present value of amortized cost for load node j in current state, Mj,newFor increasing the load Δ P at the load node iiNet present value of post-allocated cost, mjThe transmission equipment i is apportioned to the difference between the net present values of the node j before and after the load is increased. The difference of net current values of L1, L2 and L3 before and after the increase of the load by the BUS1 is 0.69 ten thousand yuan, 0.58 ten thousand yuan and-0.87 ten thousand yuan; the difference of net current values of L1, L2 and L3 before and after the increase of the load by the BUS2 is 0.34 ten thousand yuan, 1.16 ten thousand yuan and 1.2 ten thousand yuan. BUS1 rates 0.4 ten thousand dollars/MW from unutilized costs; the rate for BUS2 versus unutilized cost is 2.7 ten thousand dollars/MW.
In summary, the power transmission and distribution price verification method and device based on the maximum utilization rate of the power transmission equipment share the utilized cost based on the contribution degree of the load to the peak load of the power transmission equipment, share the unused cost based on the use degree of the newly added load nodes to the unused capacity of the power transmission equipment and adopt the marginal cost pricing idea, and overcome the defects that the use degree of users at different positions on a power grid and the utilization rate of the power transmission equipment are difficult to reflect by the conventional power transmission and distribution price verification method.
Compared with the prior art, the invention has the following advantages:
1. according to the method, the maximum utilization rate of each power transmission device in each system state is considered, and the utilized cost of the power transmission device is more accurately distributed to the corresponding load through the contribution degree of each node load to the peak load of each power transmission device.
2. According to the method, when the contribution degree of each load node to each line is determined, a plurality of balance nodes are selected, so that the influence of selecting different single balance nodes on the shared result of the utilized cost of the power transmission equipment is reduced, and the shared result is more reasonable.
3. The method and the device can effectively evaluate the influence of the newly added loads of different nodes on the unutilized cost of each device by distributing the unutilized cost of each device by considering the influence of the increased power utilization rate of each node load on the utilization rate of the power transmission device and adopting the marginal cost pricing idea.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.
Claims (9)
1. A power transmission and distribution price verification method based on the maximum utilization rate of power transmission equipment comprises the following steps:
step S1, selecting a system state corresponding to the maximum utilization rate of each power transmission device as a system state for checking the power transmission and distribution price, and determining the utilized cost of each power transmission device based on the maximum utilization rate of each power transmission device;
step S2, based on the DC power flow tracking, the utilized cost of each power transmission equipment is allocated according to the contribution degree of each load to the maximum power flow of the power transmission equipment;
step S3, based on marginal cost pricing theory, calculating the time required by the power transmission equipment from the current state to the rated capacity of the power transmission equipment at a preset load increase rate before and after the new load is added by taking the rated capacity of each power transmission equipment as a boundary in a differential mode, and converting the change of the investment and extension time of the power transmission equipment into the change of the investment and extension cost of the power grid caused by increasing unit load by a load node so as to share the unutilized cost;
in step S2, in order to avoid the influence of the selected single balancing node on the sharing result, the contribution of the load to the power flow on the line is adjusted in equal proportion by using a generalized load transfer distribution factor, and using all the generator sets in the network as the balancing nodes of the unbalanced power on the load side.
2. The method according to claim 1, wherein the method further comprises: in step S1, the utilization rate of each power transmission device is determined based on the grid parameters and the power generation and load parameters of each selected state, and the system state corresponding to the maximum utilization rate of each power transmission device is selected as the system state for the power transmission and distribution rate check timing.
3. The method according to claim 2, wherein the step S2 further includes:
step S201, calculating generalized load transfer distribution factors in each system state, and determining the contribution degree of each load to each line load flow in the selected system state;
step S202 is to allocate the used cost of each power transmission facility to each load node according to the contribution of each load power to the peak load of the power transmission facility.
4. A power transmission and distribution price verification method based on maximum utilization rate of power transmission equipment according to claim 3, characterized in that: in step S202, the used cost of each power transmission equipment is distributed to each load node by using a postage stamp method according to the contribution degree of each load power to the peak load of the power transmission equipment.
5. The method according to claim 1, wherein the step S3 further includes:
step S300, taking the rated capacity of each power transmission device as a boundary, calculating the influence of the increased power of each load node on the power transmission device based on the generalized load transfer distribution factor, and calculating the capacity expansion time of the power transmission device before and after the power of the load node is increased;
step S301, calculating a difference between line costs before and after the load node power change to allocate the unused cost.
6. The method according to claim 5, wherein the step S300 further includes:
step S300a, calculating, for the power transmission apparatus i, a time required for the power flow thereof to increase to a rated capacity at a predetermined rate in the n state;
step S300b, increasing load Δ P at load node jjThen, the power flow change amount Δ P of the power transmission equipment i caused by the newly added load is calculatedi l；
Step S300c, based on rated capacity P of power transmission equipment ii maxAnd the tidal current value P of the power transmission equipment i in the n statei L_nAnd the power flow variation delta P of the power transmission equipment i caused by newly added loadi lThe time required for power transmission equipment i to reach rated capacity is recalculated.
7. The method according to claim 5, wherein the method further comprises: in step S301, the net present value method is used to calculate the difference between the line costs before and after the node power change, so as to distribute the unused cost.
8. The method according to claim 7, wherein step S301 further includes:
step S301a, calculating the net current value of the power transmission equipment i before the load node j adds the load;
step S301b, calculating the net current value of the power transmission equipment i after the load node j adds the load;
in step S301c, the difference between the net present values of the power transmission equipment i before and after the load node j adds the load is calculated.
9. A transmission and distribution power price verification device based on the maximum utilization rate of power transmission equipment comprises:
the system state determining unit is used for selecting the corresponding system state when the utilization rate of each power transmission device is maximum as the system state for power transmission and distribution price check timing, and determining the utilized cost of each power transmission device based on the maximum utilization rate of each power transmission device;
the utilized cost allocation unit allocates the utilized cost of each power transmission device according to the contribution degree of each load to the maximum power flow of the power transmission device based on direct current power flow tracking;
the unutilized cost allocation unit calculates the time required by the power transmission equipment from the current state to the rated capacity of the power transmission equipment at a preset load increase rate before and after a newly increased load by taking the rated capacity of each power transmission equipment as a boundary in a differential mode based on a marginal cost pricing theory, and converts the change of the investment extension time of the power transmission equipment into the change of the investment extension cost of the power grid caused by increasing unit load by a load node so as to allocate the unutilized cost;
wherein the utilized cost apportionment unit further comprises:
and the generalized load transfer distribution factor calculation module is used for calculating generalized load transfer distribution factors in each system state and determining the contribution degree of each load to each line load flow in the selected system state.
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