CN111339632A - Method and system for isolating topological change of electromechanical-electromagnetic hybrid simulation network - Google Patents
Method and system for isolating topological change of electromechanical-electromagnetic hybrid simulation network Download PDFInfo
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Abstract
The invention provides a method and a system for isolating topological changes of an electromechanical-electromagnetic hybrid simulation network. The method and the system generate a new electromechanical-electromagnetic hybrid simulation network by copying boundary nodes of an original electromechanical-electromagnetic hybrid simulation network, adding elements at the copied nodes and the boundary points, re-dividing connecting lines according to the copied nodes and the added elements, sequentially performing power flow verification and electromechanical transient simulation check in the new network, and determining that the electromechanical-electromagnetic transient hybrid simulation of the power system can be performed according to the new electromechanical transient simulation network and the electromagnetic transient simulation network when the two verifications are passed. According to the method and the system, on the basis of the existing electromechanical-electromagnetic simulation network boundary division, the influence of the electromechanical transient simulation network topology change and the electromagnetic transient simulation network topology change on the boundary is isolated by adding a small-impedance branch and a load between a boundary node and a copy node, so that the effect of the online hybrid simulation calculation efficiency is improved.
Description
Technical Field
The present invention relates to the field of digital simulation of power systems, and more particularly, to a method and system for isolating electromechanical-electromagnetic hybrid simulation network topology changes.
Background
The electromechanical-electromagnetic hybrid simulation of the power system is a simulation method which combines the advantages of electromechanical transient simulation, such as high speed, accurate electromagnetic transient simulation result, capability of retaining the dynamic characteristics of the power system and capability of simulating power electronic circuits of a local power grid, particularly an extra-high voltage direct-current power transmission system, in detail.
Before the electromechanical-electromagnetic hybrid simulation calculation of the power system, firstly, the power system is divided into an electromechanical transient simulation network and an electromagnetic transient simulation network, and the dividing method adopts boundary nodes and connecting lines to describe the boundary between the electromechanical transient simulation network and the electromagnetic transient simulation network. In the prior art, the network division mode is generally performed manually, or a tie line and a boundary node thereof are manually entered, or a power grid is divided on a single line diagram of a power system in a mouse mode. After the electromechanical-electromagnetic boundary points and the connecting lines are specified, the electromechanical transient simulation program reads electromechanical transient simulation network data, and the electromagnetic transient simulation program reads electromagnetic transient simulation network data and starts parallel computation. In the calculation process, the electromechanical transient simulation program and the electromagnetic transient simulation program exchange boundary node state quantities at two sides to complete the electromechanical-electromagnetic hybrid simulation calculation process. However, the existing simulation method cannot solve the problem that in the electromechanical-electromagnetic hybrid simulation of the online power system, the charged state of the boundary nodes and the connecting lines is changed due to the topological change of the electromechanical transient simulation network, so that the inconvenience that the boundary system needs to be reconstructed due to the topological change of the hybrid simulation boundary is caused, and the online computing efficiency is greatly reduced.
Disclosure of Invention
In order to solve the technical problems that when an electric power system carries out online electromechanical-electromagnetic hybrid simulation in the prior art, the change of electromechanical transient simulation network topology causes the change of the electrified states of boundary nodes and connecting lines, so that the change of hybrid simulation boundary topology needs to reconstruct a boundary system, and the online computing efficiency is greatly reduced, the invention provides a method for isolating the change of electromechanical-electromagnetic hybrid simulation network topology, which comprises the following steps:
copying boundary nodes between the electromechanical transient simulation network and the electromagnetic transient simulation network in the electromechanical-electromagnetic hybrid simulation network of the power system to generate copied nodes;
adding a small impedance branch between the boundary node and the replica node, and adding a load on the replica node;
performing electromechanical-electromagnetic hybrid simulation networking based on the added replication nodes and the small impedance branch to generate a new electromechanical-electromagnetic transient hybrid simulation network;
setting power flow parameters for the added small-impedance branch and the load;
according to the added small impedance branch and load power flow parameters, carrying out power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network;
setting transient parameters for the added small impedance branch and load, and setting a load model for the added load;
performing electromechanical transient simulation check in the new electromechanical-electromagnetic transient hybrid simulation network according to the added small impedance branch and the transient parameters and load model of the load;
and when the power flow verification and the electromechanical transient simulation verification pass, determining to perform electromechanical-transient hybrid simulation of the power system according to the new electromechanical transient simulation network and the electromagnetic transient simulation network.
Further, performing electromechanical-electromagnetic hybrid simulation networking based on the added replica node and the small impedance branch, and generating a new electromechanical-electromagnetic transient hybrid simulation network refers to modifying the topological connection of all elements connected with the boundary node of the original electromechanical transient network and connecting the copied node with the modified elements, and using the added small impedance branch as a connecting line.
Further, setting a power flow parameter for the added small impedance branch and the load, and setting a load model for the added load means that a unit value is adopted, a positive sequence resistance, a positive sequence ground conductance and a susceptance of the small impedance branch are set to be 0, and a positive sequence reactance of the small impedance branch is set to be 0.0001; setting the active power and the reactive power of a load to be 0, setting a load model to be a static characteristic load model, and setting parameters to enable the model to be a constant power model.
Further, according to the added small impedance branch and the load power flow parameter, performing power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network comprises:
according to the added small impedance branch and load flow parameters, performing flow calculation in the new electromechanical-electromagnetic transient hybrid simulation network to determine active power P of a balance node in the power grid1And reactive power Q1；
Will balance the active power P of the nodes1And active power P0Comparing to obtain a comparison error PcWill balance the reactive power Q of the node1And reactive power Q0Comparing to obtain a comparison error QcWherein the active power P0And reactive power Q0Determining the active power and the reactive power of the balance node when load flow calculation is carried out on the original electromechanical-electromagnetic transient hybrid simulation network respectively;
when the comparison error PcAnd QcAnd when the current is smaller than the preset comparison threshold value, determining that the current check is passed.
Further, setting transient parameters for the added small impedance branch and the load, and setting a load model for the added load means that a per unit value is adopted, setting the negative sequence resistance, the negative sequence conductance to ground and the susceptance of the small impedance branch to 0, setting the negative sequence reactance of the small impedance branch to 0.0001, setting the zero sequence resistance, the zero sequence conductance to ground and the susceptance to 0, setting the zero sequence reactance to 0.0003, setting the active power and the reactive power of the load to 0, setting the load model to be a static characteristic load model, and setting parameters to make the model be a constant power model.
Further, performing an electromechanical transient simulation check in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and the load model of the added small impedance branch and the load comprises:
performing electromechanical transient simulation in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and load models of the added small impedance branches and loads, and determining the state quantity response X of the key nodes in the power grid1；
Responding the state quantity of a key node in the power grid to X1With state quantity response X0Making a comparison when the state quantity responds to X1With state quantity response X0When the two phases are the same, determining that the electromechanical transient simulation passes verification, wherein X0Responding to the state quantity X of the key node1And determining the state quantity response of the key node when the corresponding original electromechanical-electromagnetic transient hybrid simulation network carries out electromechanical transient simulation.
According to another aspect of the present invention, the present invention provides a system for isolating topological changes in an electro-mechanical-electromagnetic hybrid simulation network, the system comprising:
a node replication unit for replicating a boundary node between the electromechanical transient simulation network and the electromagnetic transient simulation network in a power system electromechanical-electromagnetic hybrid simulation network to generate a replicated node;
an element adding unit for adding a small impedance branch between the boundary node and the replica node and adding a load on the replica node;
the network dividing unit is used for performing electromechanical-electromagnetic hybrid simulation networking based on the added replication nodes and the small impedance branches to generate a new electromechanical-electromagnetic transient hybrid simulation network;
a first setting unit for setting a power flow parameter for the added small impedance branch and the load;
the power flow verification unit is used for performing power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network according to the added small impedance branch and the power flow parameters of the load;
a second setting unit for setting transient parameters for the added small impedance branch and load and setting a load model for the added load;
the simulation checking unit is used for performing electromechanical transient simulation checking in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and the load model of the added small impedance branch and the load;
and the network determining unit is used for determining that the electromechanical-transient hybrid simulation of the power system is carried out according to the new electromechanical transient simulation network and the electromagnetic transient simulation network when the power flow check and the electromechanical transient simulation check are passed.
Further, the network dividing unit performs electromechanical-electromagnetic hybrid simulation networking based on the added replica node and the small impedance branch, and generates a new electromechanical-electromagnetic transient hybrid simulation network, that is, all elements connected with the boundary node of the original electromechanical transient network are connected with the replica node by modifying their topological connections, and the added small impedance branch is used as a tie line.
Further, the setting unit sets a power flow parameter for the added small impedance branch and the load, and sets a load model for the added load means that a per unit value is adopted, a positive sequence resistance, a positive sequence ground conductance and a susceptance of the small impedance branch are set to be 0, and a positive sequence reactance of the small impedance branch is set to be 0.0001; setting the active power and the reactive power of a load to be 0, setting a load model to be a static characteristic load model, and setting parameters to enable the model to be a constant power model.
Further, the power flow verification unit comprises:
a first calculating unit, configured to perform load flow calculation in the new electromechanical-electromagnetic transient hybrid simulation network according to the added load flow parameters of the small impedance branch and the load, and determine an active power P of a balancing node in the power grid1And reactive power Q1；
A second calculation unit for balancing the active power P of the nodes1And active power P0Comparing to obtain a comparison error PcWill be balancedReactive power Q of a node1And reactive power Q0Comparing to obtain a comparison error QcWherein the active power P0And reactive power Q0Determining the active power and the reactive power of the balance node when load flow calculation is carried out on the original electromechanical-electromagnetic transient hybrid simulation network respectively;
a result determination unit for determining the comparison error PcAnd QcAnd when the current is smaller than the preset comparison threshold value, determining that the current check is passed.
Further, the second setting unit sets transient parameters for the added small impedance branch and the load, and sets a load model for the added load means that a per unit value is adopted, the negative sequence resistance, the negative sequence to ground conductance and the susceptance of the small impedance branch are set to 0, the negative sequence reactance of the small impedance branch is set to 0.0001, the zero sequence resistance, the zero sequence to ground conductance and the susceptance are set to 0, the zero sequence reactance is set to 0.0003, the active power and the reactive power of the load are set to 0, the load model is set to a static characteristic load model, and parameters are set so that the model is a constant power model.
Further, the simulation checking unit includes:
a response determination unit for performing electromechanical transient simulation in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and load models of the added small impedance branches and loads, and determining the state quantity response X of the key nodes in the power grid1；
A checking and judging unit for responding the state quantity of the key node in the power grid to X1With state quantity response X0Making a comparison when the state quantity responds to X1With state quantity response X0When the two phases are the same, determining that the electromechanical transient simulation passes verification, wherein X0Responding to the state quantity X of the key node1And determining the state quantity response of the key node when the corresponding original electromechanical-electromagnetic transient hybrid simulation network carries out electromechanical transient simulation.
The method and the system for isolating the topological change of the electromechanical-electromagnetic hybrid simulation network provided by the technical scheme of the invention generate a new electromechanical-electromagnetic hybrid simulation network by copying boundary nodes of an original electromechanical-electromagnetic hybrid simulation network, adding elements at the copied nodes and the boundary points, re-dividing connecting lines according to the copied nodes and the added elements, setting parameters for the added elements in the new electromechanical-electromagnetic hybrid simulation network, sequentially carrying out power flow verification and electromechanical transient simulation verification, and determining that the electromechanical-transient hybrid simulation of the power system can be carried out according to the new electromechanical transient simulation network and the electromagnetic transient simulation network when the two verifications are passed. The method and the system can simplify the electromechanical-electromagnetic hybrid simulation boundary topology and isolate the influence of the electromechanical transient simulation network topology change and the electromagnetic transient simulation network topology change on the boundary by adding a small impedance branch and a zero power load between the boundary node and the replication node on the basis of the existing electromechanical-electromagnetic simulation network boundary division, thereby playing a role in improving the online hybrid simulation calculation efficiency.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a method of isolating electromechanical-electromagnetic hybrid simulation network topology changes in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the topology of an original electromechanical-electromagnetic hybrid simulation network according to a preferred embodiment of the present invention;
FIG. 3 is a schematic of the topology of the new electro-mechanical-electromagnetic hybrid simulation network according to a preferred embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a system for isolating topological changes in an electromechanical-electromagnetic hybrid simulation network according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
FIG. 1 is a flow chart of a method for isolating topological changes in an electromechanical-electromagnetic hybrid simulation network in accordance with a preferred embodiment of the present invention. As shown in fig. 1, the method for isolating topology changes of an electromechanical-electromagnetic hybrid simulation network according to the preferred embodiment starts with step 101.
In step 101, boundary nodes between the electromechanical transient simulation network and the electromagnetic transient simulation network are copied in the electromechanical-electromagnetic hybrid simulation network of the power system to generate copied nodes.
At step 102, a small impedance branch is added between the boundary node and the replica node, and a load is added on the replica node.
In step 103, electromechanical-electromagnetic hybrid simulation networking is performed based on the added replication nodes and the small impedance branches, and a new electromechanical-electromagnetic transient hybrid simulation network is generated.
Preferably, performing electromechanical-electromagnetic hybrid simulation networking based on the added replica node and the small impedance branch, and generating the new electromechanical-electromagnetic transient hybrid simulation network means that all elements of the original electromechanical transient network connected to the boundary node are modified in topological connection and connected to the replica node, and the added small impedance branch is used as a tie line.
Fig. 2 is a schematic diagram of the topology of an original electromechanical-electromagnetic hybrid simulation network according to a preferred embodiment of the present invention. As shown in fig. 2, in the oval circle at the lower right corner, the DC line DC200 and the ac buses BUS34 and BUS33 at both sides are divided into electromagnetic transient simulation networks, and the symbol X in the figure represents on which side of the tie line the division point is located. As can be seen from the figure, the division point X near the BUS34 indicates that the division point is on the BUS34 side of the AC42, and the other power grids are collectively referred to as electromechanical transient simulation networks except the electromagnetic transient simulation network divided in the oval circle, that is, in the hybrid simulation network of fig. 2, the electromechanical-electromagnetic boundary nodes are BUS33 and BUS 34.
FIG. 3 is a schematic of the topology of the new electro-mechanical-electromagnetic hybrid simulation network according to a preferred embodiment of the present invention. As shown in FIG. 3, the power grid topology shown in FIG. 2 is not modified, except that buses BUS34-1 and BUS33-1, loads ld34-1 and ld33-1, and small impedance branches br1 and br2 are added near the electromechanical-electromagnetic boundary nodes BUS33 and BUS 34. The original electromagnetic transient simulation network topology is kept unchanged according to the principle of electromechanical-electromagnetic boundary node selection, so that the corresponding electromechanical-electromagnetic boundary nodes are transferred to the small-impedance branches br1 and br2 close to the electromagnetic transient simulation network side, as marked by X in the figure, so that in the new electromechanical-electromagnetic hybrid simulation network of FIG. 3, the boundary nodes are BUS34 and BUS33, and the connecting lines are small-impedance branches br1 and br 2.
At step 104, power flow parameters are set for the added small impedance legs and loads.
Preferably, setting a power flow parameter for the added small impedance branch and the load, and setting a load model for the added load means that a unit value is adopted, a positive sequence resistance, a positive sequence ground conductance and a susceptance of the small impedance branch are set to be 0, and a positive sequence reactance of the small impedance branch is set to be 0.0001; setting the active power and the reactive power of a load to be 0, setting a load model to be a static characteristic load model, and setting parameters to enable the model to be a constant power model.
In step 105, according to the added small impedance branch and the load power flow parameters, performing power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network.
Preferably, the performing of the power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network according to the added power flow parameters of the small impedance branch and the load comprises:
carrying out load flow calculation in the new electromechanical-electromagnetic transient hybrid simulation network according to the added small impedance branch and the load flow parameters,determining active power P of balancing node in power grid1And reactive power Q1；
Will balance the active power P of the nodes1And active power P0Comparing to obtain a comparison error PcWill balance the reactive power Q of the node1And reactive power Q0Comparing to obtain a comparison error QcWherein the active power P0And reactive power Q0Determining the active power and the reactive power of the balance node when load flow calculation is carried out on the original electromechanical-electromagnetic transient hybrid simulation network respectively;
when the comparison error PcAnd QcAnd when the current is smaller than the preset comparison threshold value, determining that the current check is passed.
At step 106, transient parameters are set for the added small impedance leg and load, and a load model is set for the added load.
Preferably, setting transient parameters for the added small impedance branch and the load, and setting a load model for the added load means that a per unit value is adopted, setting the negative sequence resistance, the negative sequence conductance to ground and the susceptance of the small impedance branch to 0, setting the negative sequence reactance of the small impedance branch to 0.0001, setting the zero sequence resistance, the zero sequence conductance to ground and the susceptance to 0, setting the zero sequence reactance to 0.0003, setting the active power and the reactive power of the load to 0, setting the load model to be a static characteristic load model, and setting parameters to make the model be a constant power model.
In step 107, performing electromechanical transient simulation check in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and the load model of the added small impedance branch and the load.
Preferably, performing an electromechanical transient simulation check in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and the load model of the added small impedance branch and the load comprises:
performing electromechanical transient simulation in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and load models of the added small impedance branches and loads to determine the state of the power gridState quantity response X of key node1；
Responding the state quantity of a key node in the power grid to X1With state quantity response X0Making a comparison when the state quantity responds to X1With state quantity response X0When the two phases are the same, determining that the electromechanical transient simulation passes verification, wherein X0Responding to the state quantity X of the key node1And determining the state quantity response of the key node when the corresponding original electromechanical-electromagnetic transient hybrid simulation network carries out electromechanical transient simulation.
In step 108, when the power flow verification and the electromechanical transient simulation verification pass, determining to perform electromechanical-transient hybrid simulation on the power system according to the new electromechanical transient simulation network and the new electromagnetic transient simulation network.
In online calculation, the state of a power grid changes from moment to moment, and the topology changes of boundary nodes and tie lines may be caused by the topology changes of an electromechanical transient simulation network, for example, a power failure is caused by power loss, or the power grid is switched on a live line to be charged. The change of the states can cause that a coordinated computing network needs to be reconstructed in the hybrid simulation computing process, which brings inconvenience to the realization of program functions and also influences the program efficiency. After the method of the preferred embodiment is adopted, the branch circuits needing to be calculated by the coordination calculation network only have the small impedance branch circuits and the associated boundary nodes, and the change is avoided, so that the coordination calculation network is not required to be formed again, the inconvenience that the electromechanical-electromagnetic hybrid simulation model is required to be reconstructed when the hybrid simulation boundary topology changes is avoided, the calculation is convenient, and the simulation efficiency is improved.
FIG. 4 is a schematic structural diagram of a system for isolating topological changes in an electromechanical-electromagnetic hybrid simulation network according to a preferred embodiment of the present invention. As shown in fig. 4, the system 400 for isolating topology changes of an electromechanical-electromagnetic hybrid simulation network according to the preferred embodiment includes:
a node replication unit 401 for replicating boundary nodes between the electromechanical transient simulation network and the electromagnetic transient simulation network in the power system electromechanical-electromagnetic hybrid simulation network to generate replicated nodes.
An element adding unit 402 for adding a small impedance branch between the boundary node and the replica node and adding a load on the replica node.
And a network dividing unit 403, configured to perform electromechanical-electromagnetic hybrid simulation networking based on the added replica nodes and the small-impedance branches, so as to generate a new electromechanical-electromagnetic transient hybrid simulation network.
A first setting unit 404 for setting a power flow parameter for the added small impedance branch and the load.
And a power flow verification unit 405, configured to perform power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network according to the added small impedance branch and the power flow parameter of the load.
A second setting unit 406 for setting transient parameters for the added small impedance branch and load and setting a load model for the added load.
And the simulation checking unit 407 is configured to perform electromechanical transient simulation checking in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and the load model of the added small impedance branch and the load.
A network determining unit 408, configured to determine to perform electromechanical-transient hybrid simulation of the power system according to the new electromechanical transient simulation network and the new electromagnetic transient simulation network when both the power flow verification and the electromechanical transient simulation verification pass.
Preferably, the network dividing unit 403 performs electromechanical-electromagnetic hybrid simulation networking based on the added replica node and the small impedance branch, and generating the new electromechanical-electromagnetic transient hybrid simulation network means that all the elements connecting the original electromechanical transient network and the boundary node are connected with the replica node by modifying their topological connections, and the added small impedance branch is used as a tie line.
Preferably, the first setting unit 404 sets the power flow parameters for the added small impedance branch and the load, and sets the load model for the added load, that is, sets the positive sequence resistance, the positive sequence ground conductance and the susceptance of the small impedance branch to 0, and sets the positive sequence reactance of the small impedance branch to 0.0001 by using a per unit value; setting the active power and the reactive power of a load to be 0, setting a load model to be a static characteristic load model, and setting parameters to enable the model to be a constant power model, wherein a constant power coefficient parameter is set to be 1.0, and other parameters are set to be 0.
Preferably, the power flow verification unit 405 includes:
a first calculating unit 451 for performing a load flow calculation in the new electromechanical-electromagnetic transient hybrid simulation network according to the added load flow parameters of the small impedance branch and the load, and determining an active power P of a balancing node in the power grid1And reactive power Q1；
A second calculating unit 452 for balancing the active power P of the nodes1And active power P0Comparing to obtain a comparison error PcWill balance the reactive power Q of the node1And reactive power Q0Comparing to obtain a comparison error QcWherein the active power P0And reactive power Q0Determining the active power and the reactive power of the balance node when load flow calculation is carried out on the original electromechanical-electromagnetic transient hybrid simulation network respectively;
a result determination unit 452 for determining a result when the comparison error P is smallercAnd QcAnd when the current is smaller than the preset comparison threshold value, determining that the current check is passed.
Preferably, the second setting unit 406 sets transient parameters for the added small impedance branch and the load, and sets a load model for the added load, by adopting per unit values, setting the negative sequence resistance, the negative sequence conductance to ground and the susceptance of the small impedance branch to 0, setting the negative sequence reactance of the small impedance branch to 0.0001, setting the zero sequence resistance, the zero sequence conductance to ground and the susceptance to 0, setting the zero sequence reactance to 0.0003, setting the active power and the reactive power of the load to 0, setting the load model to a static load model, and setting parameters so that the model is a constant power model.
Preferably, the simulation checking unit 407 includes:
a response determining unit 471 for mixing the simulation in the new electromechanical-electromagnetic transient according to the transient parameters and the load model of the added small impedance branch and the loadElectromechanical transient simulation is carried out in a true network, and state quantity response X of key nodes in a power grid is determined1；
A checking and determining unit 472 for responding the state quantity of the key node in the power grid to X1With state quantity response X0Making a comparison when the state quantity responds to X1With state quantity response X0When the two phases are the same, determining that the electromechanical transient simulation passes verification, wherein X0Responding to the state quantity X of the key node1And determining the state quantity response of the key node when the corresponding original electromechanical-electromagnetic transient hybrid simulation network carries out electromechanical transient simulation.
The step of reconstructing the boundary system of the electromechanical-electromagnetic hybrid simulation network of the electric power system by the system for isolating the topological change of the electromechanical-electromagnetic hybrid simulation network is the same as the step adopted by the method for isolating the topological change of the electromechanical-electromagnetic hybrid simulation network, the technical effect is the same, and the description is omitted.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (12)
1. A method for isolating topological changes in an electro-mechanical-electromagnetic hybrid simulation network, the method comprising:
copying boundary nodes between the electromechanical transient simulation network and the electromagnetic transient simulation network in the electromechanical-electromagnetic hybrid simulation network of the power system to generate copied nodes;
adding a small impedance branch between the boundary node and the replica node, and adding a load on the replica node;
performing electromechanical-electromagnetic hybrid simulation networking based on the added replication nodes and the small impedance branch to generate a new electromechanical-electromagnetic transient hybrid simulation network;
setting power flow parameters for the added small-impedance branch and the load;
according to the added small impedance branch and load power flow parameters, carrying out power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network;
setting transient parameters for the added small impedance branch and load, and setting a load model for the added load;
performing electromechanical transient simulation check in the new electromechanical-electromagnetic transient hybrid simulation network according to the added small impedance branch and the transient parameters and load model of the load;
and when the power flow verification and the electromechanical transient simulation verification pass, determining to perform electromechanical-electromagnetic transient hybrid simulation of the power system according to the new electromechanical transient simulation network and the electromagnetic transient simulation network.
2. The method according to claim 1, wherein the electromechanical-electromagnetic hybrid simulation networking is performed based on the added replica node and the small impedance branch, and the generation of the new electromechanical-electromagnetic transient hybrid simulation network is performed by modifying the topological connection of all the elements connecting the original electromechanical transient network and the boundary node, connecting the topological connection with the replica node, and using the added small impedance branch as a tie line.
3. The method according to claim 1, wherein setting power flow parameters for the added small impedance branch and the load and setting a load model for the added load means setting the positive sequence resistance, the positive sequence ground conductance and the susceptance of the small impedance branch to 0 and setting the positive sequence reactance of the small impedance branch to 0.0001 using a per unit value; setting the active power and the reactive power of a load to be 0, setting a load model to be a static characteristic load model, and setting parameters to enable the model to be a constant power model.
4. The method of claim 1, wherein performing a power flow check in the new electro-mechanical-electromagnetic transient hybrid simulation network according to the power flow parameters of the added small impedance branch and the load comprises:
according to the added small impedance branch and load flow parameters, performing flow calculation in the new electromechanical-electromagnetic transient hybrid simulation network to determine active power P of a balance node in the power grid1And reactive power Q1；
Will balance the active power P of the nodes1And active power P0Comparing to obtain a comparison error PcWill balance the reactive power Q of the node1And reactive power Q0Comparing to obtain a comparison error QcWherein the active power P0And reactive power Q0Determining the active power and the reactive power of the balance node when load flow calculation is carried out on the original electromechanical-electromagnetic transient hybrid simulation network respectively;
when the comparison error PcAnd QcAnd when the current is smaller than the preset comparison threshold value, determining that the current check is passed.
5. The method according to claim 1, wherein setting transient parameters for the added small impedance branch and the load and setting the load model for the added load means setting the negative sequence resistance, the negative sequence conductance to ground and the susceptance of the small impedance branch to 0, setting the negative sequence reactance of the small impedance branch to 0.0001, setting the zero sequence resistance, the zero sequence conductance to ground and the susceptance to 0, setting the zero sequence reactance to 0.0003, setting the active power and the reactive power of the load to 0, setting the load model to a static load model, and setting parameters to make the model a constant power model.
6. The method of claim 1, wherein performing an electromechanical transient simulation check in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and load model of the added small impedance branch and load comprises:
performing electromechanical transient simulation in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and load models of the added small impedance branches and loads, and determining the state quantity response X of the key nodes in the power grid1；
Responding the state quantity of a key node in the power grid to X1With state quantity response X0Making a comparison when the state quantity responds to X1With state quantity response X0When the two phases are the same, determining that the electromechanical transient simulation passes verification, wherein X0Responding to the state quantity X of the key node1And determining the state quantity response of the key node when the corresponding original electromechanical-electromagnetic transient hybrid simulation network carries out electromechanical transient simulation.
7. A system for isolating topological changes in an electro-mechanical-electromagnetic hybrid simulation network, the system comprising:
a node replication unit for replicating a boundary node between the electromechanical transient simulation network and the electromagnetic transient simulation network in a power system electromechanical-electromagnetic hybrid simulation network to generate a replicated node;
an element adding unit for adding a small impedance branch between the boundary node and the replica node and adding a load on the replica node;
the network dividing unit is used for performing electromechanical-electromagnetic hybrid simulation networking based on the added replication nodes and the small impedance branches to generate a new electromechanical-electromagnetic transient hybrid simulation network;
a first setting unit for setting a power flow parameter for the added small impedance branch and the load;
the power flow verification unit is used for performing power flow verification in the new electromechanical-electromagnetic transient hybrid simulation network according to the added small impedance branch and the power flow parameters of the load;
a second setting unit for setting transient parameters for the added small impedance branch and load and setting a load model for the added load;
the simulation checking unit is used for performing electromechanical transient simulation checking in the new electromechanical-electromagnetic transient hybrid simulation network according to the transient parameters and the load model of the added small impedance branch and the load;
and the network determining unit is used for determining that the electromechanical-transient hybrid simulation of the power system is carried out according to the new electromechanical transient simulation network and the electromagnetic transient simulation network when the power flow check and the electromechanical transient simulation check are passed.
8. The system according to claim 7, wherein the network partitioning unit performs electromechanical-electromagnetic hybrid simulation networking based on the added replica node and the small impedance branch, and the generation of the new electromechanical-electromagnetic transient hybrid simulation network refers to that all elements of the original electromechanical transient network connected to the boundary node are modified in topological connection with the replica node, and the added small impedance branch is used as a tie line.
9. The system according to claim 7, wherein the first setting unit sets a power flow parameter for the added small-impedance branch and the load, and sets a load model for the added load means that the per unit value is used to set the positive sequence resistance, the positive sequence ground conductance and the susceptance of the small-impedance branch to 0, and the positive sequence reactance of the small-impedance branch to 0.0001; setting the active power and the reactive power of a load to be 0, setting a load model to be a static characteristic load model, and setting parameters to enable the model to be a constant power model.
10. The system of claim 7, wherein the power flow verification unit comprises:
a first calculating unit, configured to perform load flow calculation in the new electromechanical-electromagnetic transient hybrid simulation network according to the added load flow parameters of the small impedance branch and the load, and determine an active power P of a balancing node in the power grid1And reactive power Q1；
A second calculation unit for balancing the active power P of the nodes1And active power P0Comparing to obtain a comparison error PcWill balance the reactive power Q of the node1And reactive power Q0Comparing to obtain a comparison error QcWherein the active power P0And reactive power Q0Determining the active power and the reactive power of the balance node when load flow calculation is carried out on the original electromechanical-electromagnetic transient hybrid simulation network respectively;
a result determination unit for determining the comparison error PcAnd QcAnd when the current is smaller than the preset comparison threshold value, determining that the current check is passed.
11. The system according to claim 7, wherein the second setting unit sets transient parameters for the added small impedance branch and the load, and sets the load model for the added load means that, with per unit values, the negative sequence resistance, the negative sequence conductance to ground, and the susceptance of the small impedance branch are set to 0, the negative sequence reactance of the small impedance branch is set to 0.0001, the zero sequence resistance, the zero sequence conductance to ground, and the susceptance are all set to 0, the zero sequence reactance is set to 0.0003, the active power and the reactive power of the load are set to 0, the load model is set to a static load model, and the parameters are set so that the model is a constant power model.
12. The system of claim 7, wherein the simulation verification unit comprises:
a response determination unit for determining transient parameters of the small impedance branch and the load according to the increaseA number and load model, performing electromechanical transient simulation in the new electromechanical-electromagnetic transient hybrid simulation network, and determining state quantity response X of key nodes in the power grid1；
A checking and judging unit for responding the state quantity of the key node in the power grid to X1With state quantity response X0Making a comparison when the state quantity responds to X1With state quantity response X0When the two phases are the same, determining that the electromechanical transient simulation check passes, wherein X0Responding to the state quantity X of the key node1And determining the state quantity response of the key node when the corresponding original electromechanical-electromagnetic transient hybrid simulation network carries out electromechanical transient simulation.
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