CN111478321A - Power distribution network node selection method for connecting distributed wind power generation system - Google Patents
Power distribution network node selection method for connecting distributed wind power generation system Download PDFInfo
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Abstract
The invention discloses a method for selecting nodes of a power distribution network connected with a distributed wind power generation system, wherein the power distribution network comprises a plurality of nodes to be selected for accessing the distributed wind power generation system, and the method comprises the following steps: establishing a power distribution network simulation model; acquiring short circuit ratios of a plurality of nodes to be selected through a power distribution network simulation model; selecting nodes to be selected with short-circuit ratio values larger than a first preset value to obtain a plurality of connecting nodes; connecting a plurality of connecting nodes with the distributed wind power generation system model in sequence, and simulating through a power distribution network simulation model; judging whether the voltage simulation numerical values of a plurality of nodes to be selected meet the preset voltage change requirement or not; if so, the connecting node can be accessed to the distributed wind power generation system; if not, the rated capacity is adjusted and the short circuit ratio of the access node is acquired again. On the basis of not changing the original topological circuit of the power distribution network, the distributed wind power generation system is accessed to the maximum capacity through the optimal site selection access point, the system access is reasonably planned, and the safe operation is guaranteed.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a power distribution network node selection method for connecting a distributed wind power generation system.
Background
Based on the factors of environmental protection, economy and the like, the distributed wind power as a renewable energy source is widely applied to be connected to a power grid, and the market share is more and more important. Compared with conventional power generation, the distributed wind power generation is closer to the power load, the power transmission distance is smaller, and the loss is smaller. At present, the technology of integrating distributed wind power generation into a power grid is basically mature, and wind power energy engineering developed and constructed in partial regions of China has remarkable social benefit and environmental protection benefit. However, the distributed wind power is connected to the power grid, so that the original power grid structure is changed, the impact is brought to the original power grid, the tide of the original system is changed, and the power quality in the power grid is reduced. Therefore, the problems that the fault operation of a protection device in the power grid is caused by the phenomena of feeder line overload and overvoltage after the distributed wind power is connected into the power distribution network are solved. The determination of the capacity of the distributed wind power accessed into the power grid and the selection of a proper access point are necessary preconditions for ensuring the voltage quality and are key points of the distributed wind power grid-connected planning.
The existing distributed wind power is connected to a power distribution network, and no complete practical scheme exists for capacity determination and access point selection at present. At present, distributed wind power is connected into a power distribution network, and micro site selection is mainly carried out on the basis of wind resources in the site selection aspect, so that the maximum utilization of wind energy is emphasized; in the aspect of load, the minimum load of the power distribution network is mainly considered, the capacity of the accessed distributed wind power is designed under the condition of the minimum load, the wind power access capacity is limited, and the economy is not high.
In the prior art, when the micro-addressing of wind resources is performed, the wind resource condition in an area is mainly considered, the machine site is established by taking the wind resource as the best primary target, the transmission distance of the on-line electric energy after the wind energy is connected to the grid can be increased, the transmission cost is increased, and the power grid loss is increased. When the accessed wind power capacity is designed according to the minimum power load condition, the accessed distributed wind power capacity is usually smaller, and the maximum economic benefit is not achieved. In addition, when the existing distributed wind power is connected to a power distribution network, the voltage change condition of each node on a feeder line in the power distribution network and the bearing capacity of the feeder line are not fully considered.
Disclosure of Invention
The embodiment of the invention aims to provide a power distribution network node selection method for connecting a distributed wind power generation system, which is characterized in that the distributed wind power generation system is accessed to the maximum capacity through an optimal site selection access point on the basis of not changing the original topological circuit of a power distribution network, the access of the distributed wind power generation system is reasonably planned, the access cost is reduced, the expansion planning cost of the power distribution network is reduced, the safe operation of the power distribution network is ensured, and the economic benefit is improved.
In order to solve the technical problem, an embodiment of the present invention provides a method for selecting a node of a power distribution network connected to a distributed wind power generation system, where the power distribution network includes a plurality of nodes to be selected for accessing the distributed wind power generation system, and the method includes the following steps:
establishing a power distribution network simulation model;
acquiring the short circuit ratio of the plurality of nodes to be selected through the power distribution network simulation model;
selecting the nodes to be selected with the short-circuit ratio value larger than a first preset value to obtain a plurality of connecting nodes which can be connected with the distributed wind power generation system;
connecting the plurality of connecting nodes with the distributed wind power generation system model in sequence, and simulating through the power distribution network simulation model;
judging whether the voltage simulation numerical values of the nodes to be selected meet the requirement of preset voltage change or not;
if the voltage simulation numerical values of the plurality of nodes to be selected meet the preset voltage change requirement, the connecting node can be connected to the distributed wind power generation system;
and if the voltage simulation numerical values of the plurality of nodes to be selected do not meet the preset voltage change requirement, adjusting the rated capacity of the distributed wind power generation system, and obtaining the short-circuit ratio of the access node again.
Further, the obtaining of the short circuit ratio of the plurality of nodes to be selected through the power distribution network simulation model includes:
acquiring short-circuit current of the plurality of nodes to be selected through the simulation model of the power distribution network;
acquiring the short-circuit capacity of the nodes to be selected according to the short-circuit current;
acquiring rated capacity of the distributed wind power generation system;
and acquiring the short circuit ratio of the plurality of nodes to be selected according to the short circuit capacity of the plurality of nodes to be selected and the rated capacity of the distributed wind power generation system.
Further, the calculation formula of the short circuit capacity is as follows:
wherein,
for the node to be selected in the power distribution networkShort circuit capacity at i, ViIs the rated voltage of the node to be selected, ziIs the equivalent impedance at the node I to be selected, IiIs the short-circuit current at the node i to be selected.
Further, the obtaining of the rated capacity of the decentralized wind power generation system comprises:
acquiring the bearing capacity of the feeder line of the power distribution network;
acquiring the maximum capacity of the distributed wind power generation system according to the bearing capacity;
obtaining a rated capacity of the decentralized wind power generation system as a function of the maximum capacity, wherein the rated capacity is less than or equal to the maximum capacity.
Further, the calculation formula of the carrying capacity of the feeder line is as follows:
Pgen，max＜Pcons,max+Pcons,min，
wherein, Pgen，maxFor the maximum power generation of the distribution network, Pcons,maxFor maximum power consumption, P, of the distribution networkcons,minAnd the minimum power consumption of the power distribution network.
Further, the calculation formula of the maximum capacity of the decentralized wind power generation system is as follows:
Pgen，max＝Pasym,max+Pwind,max，
wherein, Pasym,maxIs the maximum power generation capacity, P, of the original generator of the power distribution networkwind,maxThe maximum power generation capacity of the distributed wind power generation system.
Further, the calculation formula of the node short-circuit ratio is as follows:
wherein, SCRiIs the short-circuit ratio of the node to be selected,
the distribution of access for the node to be selectedRated capacity of the wind power generation system.
Further, the simulating the connection node in the power distribution network simulation model further includes:
according to the rated capacity, obtaining the current-carrying capacity of a wire of the distributed wind power generation system, which is accessed to the node to be selected;
and simulating the connection node through the power distribution network by combining the current-carrying capacity of the wire.
Further, the calculation formula of the current-carrying capacity of the wire is as follows:
wherein I is the current-carrying capacity of the conductor, U is the rated voltage of the node,
is the power factor of the decentralized wind energy installation.
Further, the preset voltage variation requirement includes:
the sum of the absolute values of the positive deviation and the negative deviation of the three-phase power supply voltage of 35kV or above does not exceed a second preset value; and/or
The sum of the absolute values of the deviation of the three-phase power supply voltages of 20kV and below does not exceed a third preset value; and/or
The sum of absolute values of 220V single-phase power supply voltage deviations does not exceed a fourth preset value.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
on the basis of not changing the original topological circuit of the power distribution network, the distributed wind power generation system is accessed to the maximum capacity through the optimal site selection access point, the access of the distributed wind power generation system is reasonably planned, the access cost is reduced, the expansion planning cost of the power distribution network is reduced, the safe operation of the power distribution network is ensured, and the economic benefit is improved.
Drawings
Fig. 1 is a flowchart of a power distribution network node selection method provided in an embodiment of the present invention;
fig. 2 is a topology structure diagram of a power distribution network according to an embodiment of the present invention;
fig. 3 is a feeder voltage variation simulation diagram provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a flowchart of a power distribution network node selection method provided in an embodiment of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a method for selecting a node of a power distribution network connected to a distributed wind power generation system, including: the power distribution network comprises a plurality of nodes to be selected for accessing the distributed wind power generation system, and the method comprises the following steps:
s100, establishing a power distribution network simulation model.
And S200, acquiring short circuit ratios of a plurality of nodes to be selected through a power distribution network simulation model.
S300, selecting nodes to be selected with the short-circuit ratio value larger than a first preset value to obtain a plurality of connecting nodes capable of being connected with the distributed wind power generation system.
And selecting the nodes to be selected which can be accessed to the distributed wind power generation system according to the short circuit ratio of a plurality of nodes to be selected in the power distribution network, screening out reasonable access nodes, and ensuring the stability of the power distribution network after the distributed wind power generation system is accessed.
And S400, connecting the plurality of connecting nodes with the distributed wind power generation system model in sequence, and simulating through the power distribution network simulation model.
A power distribution network simulation model is established according to a power distribution network topological structure, simulation can be carried out by using MAT L AB/SIMU L INK and other software, the power distribution network simulation model can be restored according to actual data, and simulation prediction is carried out on the power consumption condition of a power generator of a power distribution network.
S500, judging whether the voltage simulation numerical values of the nodes to be selected meet the preset voltage change requirement.
S600, if the voltage simulation numerical values of the nodes to be selected meet the preset voltage change requirement, the connecting nodes can be connected to the distributed wind power generation system.
S700, if the voltage simulation numerical values of the nodes to be selected do not meet the preset voltage change requirement, adjusting the rated capacity of the distributed wind power generation system corresponding to the connection nodes, returning to the step S200 to obtain the short-circuit ratio of the access nodes again, and then simulating the power distribution network simulation model again to determine whether the voltage change conditions of the nodes to be selected meet the preset voltage change requirement again.
According to the technical scheme, the connection nodes are screened out according to the short-circuit ratio condition of the nodes to be selected in the power distribution network, the limit of the capacity of the accessible distributed wind power generation system is determined according to the load capacity of the feeder line, and the access nodes and the access capacity are determined according to the influence of the access capacity and the access position of the distributed wind power generation system on the voltage node of the feeder line of the power distribution network. On the basis of not changing the original topological circuit of the power distribution network, distributed wind power access is reasonably planned, access cost is reduced, expansion planning cost of the power distribution network is reduced, and safe and economic access of a distributed wind power generation system to the maximum extent is realized on the basis of ensuring the safety of the power distribution network; the access capacity of the distributed wind power generation system is improved, more energy support is provided for the power distribution network, and the economical efficiency and safe operation of the power grid are guaranteed.
In one implementation of the embodiment of the present invention, the presetting of the voltage change requirement includes: the sum of the absolute values of the positive deviation and the negative deviation of the three-phase power supply voltage of 35kV or above does not exceed a second preset value; and/or the sum of the absolute values of the deviation of the three-phase power supply voltages of 20kV and below does not exceed a third preset value; and/or the sum of absolute values of the 220V single-phase power supply voltage deviations does not exceed a fourth preset value.
Optionally, the second preset value is 10% of the nominal voltage; the third preset value is +/-7% of the nominal voltage; the fourth preset value is (-10%) - (+ 7%) of the nominal voltage.
Optionally, in the step S200, the step of obtaining the short-circuit ratios of the multiple nodes to be selected through the power distribution network simulation model may further include the following steps:
and S210, acquiring short-circuit currents of a plurality of nodes to be selected through a simulation model of the power distribution network.
Specifically, the power distribution network simulation model is related to substation, feeder line and/or load parameters of the power distribution network.
And S220, acquiring the short-circuit capacity of the nodes to be selected according to the short-circuit current.
Specifically, the calculation formula of the short-circuit capacity is as follows:
wherein,
for short-circuit capacity, V, at node i to be selected in the distribution networkiIs the rated voltage of the node to be selected, ziIs the equivalent impedance at the node I to be selected, IiIs the short circuit current at the node i to be selected.
And S230, acquiring the rated capacity of the distributed wind power generation system.
S240, acquiring Short Circuit Ratios (SCR) of the plurality of nodes to be selected according to the Short Circuit capacity of the plurality of nodes to be selected and the rated capacity of the distributed wind power generation system.
Specifically, the calculation formula of the node short-circuit ratio is as follows:
wherein, SCRiAs the short-circuit ratio of the node to be selected,
and the rated capacity of the distributed wind power generation system is accessed to the node to be selected. Optionally, the first preset value is 3. When SCR is used>And 3, the node to be selected is a connecting node suitable for being connected to the distributed wind power generation system.
Optionally, in step S300, acquiring the rated capacity of the decentralized wind power generation system may further include the steps of:
s310, acquiring the bearing capacity of the feeder line of the power distribution network.
Specifically, the formula for calculating the carrying capacity of the feeder line is as follows:
Pgen，max＜Pcons,max+Pcons,min，
wherein, Pgen，maxFor maximum power generation of the distribution network, Pcons,maxFor maximum power consumption, P, of the distribution networkcons,minThe minimum power consumption of the power distribution network.
The bearing capacity of the feeder line corresponds to the condition that the maximum generating capacity of the power distribution network is smaller than the sum of the maximum power consumption and the minimum power consumption of the power distribution network. The bearable capacity of the feeder line is estimated according to the conditions of the maximum power consumption and the minimum power consumption in the power distribution network, so that the original feeder line is ensured not to be overloaded, and the risk of reverse tide in the power distribution network is reduced.
And S320, acquiring the maximum capacity of the distributed wind power generation system according to the bearing capacity.
Specifically, the calculation formula of the maximum capacity of the distributed wind power generation system is as follows:
Pgen，max＝Pasym,max+Pwind,max，
wherein, Pasym,maxIs the maximum generated energy P of the original generator of the power distribution networkwind,maxThe maximum power generation capacity of the distributed wind power generation system is obtained.
S330, obtaining the rated capacity of the distributed wind power generation system according to the maximum capacity, wherein the rated capacity is smaller than or equal to the maximum capacity.
Optionally, the simulation of the connection node in the power distribution network simulation model may further include taking into account the types and performances of the distributed wind power generation system and the wire of the connection node, and the current-carrying capacity of the wire may be obtained from the rated power of the distributed wind power generation system and the node voltage of the connection node, so as to obtain the type and specific performance of the wire, and introduce the specific performance of the wire into the access model of the distributed wind power generation system, thereby further improving the accuracy of the access model and improving the accuracy of the result of the power distribution network simulation model.
And acquiring the current-carrying capacity of the wire of the distributed wind power generation system connected to the corresponding node according to the rated capacity of the distributed wind power generation system.
Specifically, the calculation formula of the current-carrying capacity of the wire is as follows:
wherein I is the current-carrying capacity of the conductor, U is the rated voltage of the node,
the power factor of the distributed wind generating set. According to the current-carrying capacity of the wire, the specific performance and model of the wire can be further obtained.
Establishing an access model of the distributed wind power generation system according to the rated capacity of the distributed wind power generation system and the current-carrying capacity of the lead, introducing the access model into a power distribution network simulation model, simulating an access node accessed to the distributed wind power generation system, acquiring a voltage change rule of the access node, and determining that the access node can be accessed to the distributed wind power generation system when the voltage change rule of the access node meets a preset voltage change requirement; when the voltage change rule of the access node does not meet the preset voltage change requirement, the rated capacity of the distributed wind power generation system is reduced, the short-circuit ratio of the node to be accessed is determined again, the node to be selected with the short-circuit ratio larger than a preset value is selected as the access node, the access node is determined again, and the voltage change condition of the access node is simulated again through the power distribution network simulation model.
Fig. 2 is a topology structure diagram of a power distribution network according to an embodiment of the present invention.
Fig. 3 is a feeder voltage variation simulation diagram provided in an embodiment of the present invention.
Referring to fig. 2 and 3, in the power distribution network topology shown in fig. 2, the capacity of the distributed wind power generation system is 4MW, and the distributed wind power generation system is connected to a 10kV line, and the 10kV line is connected to a 10kV bus of a 110kV substation. When the distributed wind power generation system is connected to different nodes in the feeder line, the voltage variation condition along the feeder line is shown in fig. 3. According to the standard, the deviation of the three-phase power supply voltage of 10kV and below is +/-7% of the nominal voltage, and a node with the voltage range of +/-7% is selected from the node shown in the figure 3 and is considered to be a node suitable for accessing the distributed wind power.
The embodiment of the invention aims to protect a power distribution network node selection method for connecting a distributed wind power generation system, wherein the power distribution network comprises a plurality of nodes to be selected for accessing the distributed wind power generation system, and the method comprises the following steps: establishing a power distribution network simulation model; acquiring short circuit ratios of a plurality of nodes to be selected through a power distribution network simulation model; selecting nodes to be selected with short-circuit ratio values larger than a first preset value to obtain a plurality of connecting nodes; connecting a plurality of connecting nodes with the distributed wind power generation system model in sequence, and simulating through a power distribution network simulation model; judging whether the voltage simulation numerical values of a plurality of nodes to be selected meet the preset voltage change requirement or not; if so, the connecting node can be accessed to the distributed wind power generation system; if not, the rated capacity is adjusted and the short circuit ratio of the access node is acquired again. The technical scheme has the following effects:
on the basis of not changing the original topological circuit of the power distribution network, the distributed wind power generation system is accessed to the maximum capacity through the optimal site selection access point, the access of the distributed wind power generation system is reasonably planned, the access cost is reduced, the expansion planning cost of the power distribution network is reduced, the safe operation of the power distribution network is ensured, and the economic benefit is improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A power distribution network node selection method for connecting a distributed wind power generation system is characterized in that the power distribution network comprises a plurality of nodes to be selected for accessing the distributed wind power generation system, and the method comprises the following steps:
establishing a power distribution network simulation model;
acquiring the short circuit ratio of the plurality of nodes to be selected through the power distribution network simulation model;
selecting the nodes to be selected with the short-circuit ratio value larger than a first preset value to obtain a plurality of connecting nodes which can be connected with the distributed wind power generation system;
connecting the plurality of connecting nodes with the distributed wind power generation system model in sequence, and simulating through the power distribution network simulation model;
judging whether the voltage simulation numerical values of the nodes to be selected meet the requirement of preset voltage change or not;
if the voltage simulation numerical values of the plurality of nodes to be selected meet the preset voltage change requirement, the connecting node can be connected to the distributed wind power generation system;
and if the voltage simulation numerical values of the plurality of nodes to be selected do not meet the preset voltage change requirement, adjusting the rated capacity of the distributed wind power generation system, and obtaining the short-circuit ratio of the access node again.
2. The method for selecting the nodes of the power distribution network connecting the distributed wind power generation systems according to claim 1, wherein the obtaining the short-circuit ratio of the plurality of nodes to be selected through the power distribution network simulation model comprises:
acquiring short-circuit current of the plurality of nodes to be selected through the simulation model of the power distribution network;
acquiring the short-circuit capacity of the nodes to be selected according to the short-circuit current;
acquiring rated capacity of the distributed wind power generation system;
and acquiring the short circuit ratio of the plurality of nodes to be selected according to the short circuit capacity of the plurality of nodes to be selected and the rated capacity of the distributed wind power generation system.
3. Method for selection of distribution network nodes connecting decentralized wind energy generation systems according to claim 2,
the calculation formula of the short circuit capacity is as follows:
wherein,
is the short circuit capacity, V, of the node i to be selected in the power distribution networkiIs the rated voltage of the node to be selected, ziIs the equivalent impedance at the node I to be selected, IiIs the short-circuit current at the node i to be selected.
4. The method for selecting nodes of a power distribution network connecting distributed wind power generation systems according to claim 2, wherein the obtaining of the rated capacity of the distributed wind power generation systems comprises:
acquiring the bearing capacity of the feeder line of the power distribution network;
acquiring the maximum capacity of the distributed wind power generation system according to the bearing capacity;
obtaining a rated capacity of the decentralized wind power generation system as a function of the maximum capacity, wherein the rated capacity is less than or equal to the maximum capacity.
5. Method for selection of distribution network nodes connecting decentralized wind energy generation systems according to claim 4,
the calculation formula of the bearing capacity of the feeder line is as follows:
Pgen，max＜Pcons,max+Pcons,min，
wherein, Pgen，maxFor the maximum power generation of the distribution network, Pcons,maxFor maximum power consumption, P, of the distribution networkcons,minAnd the minimum power consumption of the power distribution network.
6. Method for selection of distribution network nodes connecting decentralized wind energy generation systems according to claim 4,
the calculation formula of the maximum capacity of the distributed wind power generation system is as follows:
Pgen，max＝Pasym,max+Pwind,max，
wherein, Pasym,maxIs the maximum power generation capacity, P, of the original generator of the power distribution networkwind,maxThe maximum power generation capacity of the distributed wind power generation system.
7. Method for selection of distribution network nodes connecting decentralized wind energy generation systems according to claim 2,
the calculation formula of the node short-circuit ratio is as follows:
wherein, SCRiIs the short-circuit ratio of the node to be selected,
and the rated capacity of the distributed wind power generation system is accessed to the node to be selected.
8. The method for selecting the nodes of the power distribution network connecting the distributed wind power generation systems according to claim 2, wherein the simulating the nodes in the power distribution network simulation model further comprises:
according to the rated capacity, obtaining the current-carrying capacity of a wire of the distributed wind power generation system, which is accessed to the node to be selected;
and simulating the connection node through the power distribution network by combining the current-carrying capacity of the wire.
9. Method for selection of distribution network nodes connecting decentralized wind energy generation systems according to claim 8,
the calculation formula of the current-carrying capacity of the wire is as follows:
wherein I is the current-carrying capacity of the conductor, U is the rated voltage of the node,
is the power factor of the decentralized wind energy installation.
10. Method for selecting distribution network nodes for connecting decentralized wind energy generation systems according to any of claims 1 to 9, wherein said predetermined voltage variation requirements comprise:
the sum of the absolute values of the positive deviation and the negative deviation of the three-phase power supply voltage of 35kV or above does not exceed a second preset value; and/or
The sum of the absolute values of the deviation of the three-phase power supply voltages of 20kV and below does not exceed a third preset value; and/or
The sum of absolute values of 220V single-phase power supply voltage deviations does not exceed a fourth preset value.
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