CN108830744B - Dynamic verification method for external network equivalent model of designated area in power system - Google Patents
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Abstract
The invention relates to a dynamic verification method for an external network equivalent model of a designated area in an electric power system, and belongs to the technical field of electric power system dispatching automation. Firstly, acquiring a current power system model, and completing splicing of the power system model and an external network equivalent model of a specified region according to boundary configuration of the specified region; periodically acquiring real-time tide data of the power system, updating the spliced model section of the designated area, and adding a time mark for storage; and periodically monitoring the change of the boundary line of the specified area, acquiring a spliced model section of the specified area at the latest moment when the line changes, simulating the change of the boundary line, performing load flow calculation, comparing the load flow calculation with real-time load flow data of the power system, and completing the dynamic verification of the external network equivalent model of the specified area. The method completes the verification of the area external network equivalent model in the upper-level dispatching area power grid, and shortens the flow of iterative optimization of the designated area external network equivalent model.
Description
Technical Field
The invention relates to a dynamic verification method for an external network equivalent model of a designated area in an electric power system, and belongs to the technical field of electric power system dispatching automation.
Background
The power grid is composed of a plurality of interconnected regions, and each region is independent of the dispatching and control of the power grid. How to ensure that the analysis and calculation results of each stage of power grid dispatching center independently performed on the power grid in the jurisdiction area of the dispatching center are correct directly influences the correctness of power grid dispatching decision. In order to improve the accuracy of independent calculation of the local power grid on the power grid model, equivalence processing needs to be performed on an external system. At present, a Guangdong power grid dispatching control center has an area external network equivalent model on-line generation system, but the system only provides an area equivalent model issuing function at present and does not have a function of verifying the generated area external network equivalent model.
Disclosure of Invention
The invention aims to provide a dynamic verification method of an external network equivalent model of a designated area in an electric power system, so as to further improve the function of an online generation system of the external network equivalent model of the area, realize the verification function of the equivalent model of the designated area in an upper dispatching area, ensure the reasonability of the equivalent model of the area sent to a lower dispatching area, and provide a dynamic power flow verification method according to a power flow calculation method, so that the generated equivalent model of the area can better meet the calculation requirement of a regional power grid.
The invention provides a dynamic verification method for an external network equivalent model of a designated area in an electric power system, which comprises the following steps:
(1) establishing an area external network equivalent database, acquiring model data information of a current power system from the power system and storing the model data information into the area external network equivalent database, wherein the model data information of the power system comprises: measuring data of a topological structure of the power system, impedance parameters of equipment of the power system, branch load flow of the power system, power generation load flow and bus node voltage, carrying out state estimation calculation and load flow calculation on the power system model, and storing a power system model section after calculation convergence in an equivalent database of an external network of a region; configuring the boundary configuration of a designated region in an extraregional equivalent database, wherein the boundary configuration comprises the following steps: a designated area boundary station and a designated area boundary line; configuring real-time data acquisition period T of power system in regional external network equivalent databasedataAnd shape of specified region boundaryState monitoring period T1；
(2) Acquiring a CIM file of the external network equivalent model of the designated area and a power grid power flow E language file of the designated area from the external network equivalent model on-line generation system of the designated area, analyzing the external network equivalent model of the designated area and the power flow file, performing state estimation calculation and power flow calculation, and storing the calculated and converged external network equivalent model section of the designated area into the external network equivalent database of the step (1);
(3) reading a loaded power system model section, an appointed area external network equivalent model section and the boundary configuration of an appointed area from the external network equivalent database of the step (2), finishing the definition of an internal network boundary of the appointed area in the power system model section according to a boundary station and a boundary branch of the appointed area, finishing the splicing of the power system model section and the appointed area external network equivalent model section according to the generated internal network boundary of the appointed area, generating a spliced power network model section of the appointed area after splicing the internal network model of the appointed area and the external network equivalent model of the appointed area of the power system, and storing the spliced power network model section of the appointed area into the external network equivalent database of the step (2);
(4) starting a dynamic tide verification function of the designated area to complete verification of the external network equivalent model of the designated area, wherein the specific process is as follows:
(4-1) reading the real-time data acquisition period T of the power system from the regional external network equivalent database in the step (3)dataSpecified area boundary state monitoring period T1Splicing the power grid model sections of the boundary lines and the designated areas;
(4-2) obtaining the period T according to the real-time data of the power system in the step (4-1)dataAcquiring real-time power flow data of a power grid from the power system, mapping the real-time power flow data into the spliced power grid model section of the designated area in the step (4-1), updating the spliced power grid model section of the designated area, adding a current time scale for the updated spliced power grid model section of the designated area, and storing the spliced power grid model section of the designated area with the time scale into the equivalent database of the external area network in the step (4-1);
(4-3) the above-mentioned zone boundary state monitoring period T1And (3) periodically monitoring the operation condition of the boundary line of the specified area in the step (4-1) in the power system, reading the section of the specified area spliced power grid model with the time scale, which is loaded and closest to the current time, from the external area network equivalent database in the step (4-2) when the operation condition of the boundary line changes, simulating the operation condition change of the boundary line, carrying out simulated power flow calculation according to the operation condition, carrying out power flow deviation comparison on the result of the simulated power flow calculation and the power flow data of the current power system, counting the mean square deviation of the power flow deviation result, taking the mean square deviation as an evaluation index of the rationality of the current specified external area network equivalent model, wherein the smaller the mean square deviation of the power flow deviation result, the closer the specified external area network equivalent model is to the actual external area network model.
The dynamic verification method for the external network equivalent model of the designated area in the power system has the following advantages:
1. the dynamic verification method for the equivalent model of the external network of the designated area in the power system can complete the verification of the equivalent model of the external network of the area in the power grid of the upper dispatching area, does not need to return a verification result after the verification of the lower dispatching area, and shortens the iterative optimization process of the equivalent model of the external network of the designated area.
2. The method monitors the boundary line open-close loop operation of the designated area in real time, completes the dynamic verification of the external network equivalent model of the designated area, reflects the rationality of the external network equivalent model of the designated area under the condition of boundary open-close loop, and fully verifies whether the external network equivalent model of the designated area can replace the real power grid model of the designated area to carry out power grid analysis calculation.
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FIG. 1 is a block flow diagram of the method of the present invention.
Detailed Description
The invention provides a dynamic verification method for an external network equivalent model of a designated area in an electric power system, a flow diagram of which is shown in figure 1, and the method comprises the following steps:
(1) establishing an equivalent database of an external network of a region, and obtaining the equivalent database from a power systemModel data information of a previous power system is stored in an area external network equivalent database, and the model data information of the power system comprises: measuring data of a topological structure of the power system, impedance parameters of equipment of the power system, branch load flow of the power system, power generation load flow and bus node voltage, carrying out state estimation calculation and load flow calculation on the power system model, and storing a power system model section after calculation convergence in an equivalent database of an external network of a region; configuring the boundary configuration of a designated region in an extraregional equivalent database, wherein the boundary configuration comprises the following steps: a designated area boundary station and a designated area boundary line; configuring real-time data acquisition period T of power system in regional external network equivalent databasedataAnd a specified zone boundary state monitoring period T1。
(2) Acquiring a CIM file of the external network equivalent model of the designated area and a power grid flow E language file of the designated area in an external network equivalent model online generation system of the designated area, analyzing the external network equivalent model of the designated area and the flow file, performing state estimation calculation and flow calculation, and storing the calculated and converged section of the external network equivalent model of the designated area into the external network equivalent database of the step (1); the E language is a data markup language of the power system, and the CIM is a power grid description language based on IEC61970 standard.
(3) Reading the loaded power system model section, the designated area external network equivalent model section and the boundary configuration of the designated area from the external network equivalent database of the step (2), finishing the definition of the internal network boundary of the designated area in the power system model section according to the boundary station and the boundary branch of the designated area, finishing the splicing of the power system model section and the designated area external network equivalent model section according to the generated internal network boundary of the designated area, generating a spliced power network model section of the designated area after splicing the internal network model of the designated area of the power system and the external network equivalent model of the designated area, and storing the spliced power network model section of the designated area into the external network equivalent database of the step (2).
(4) Starting a dynamic tide verification function of the designated area to complete verification of the external network equivalent model of the designated area, wherein the specific process is as follows:
(4-1) reading the real-time data acquisition period T of the power system in the regional external network equivalent database in the step (3)dataSpecified area boundary state monitoring period T1And splicing the power grid model section with the boundary line of the designated area and the designated area.
(4-2) obtaining the period T according to the real-time data of the power system in the step (4-1)dataAcquiring real-time power flow data of a power grid from the power system, mapping the real-time power flow data into the spliced power grid model section of the designated area in the step (4-1), updating the spliced power grid model section of the designated area, adding a current time scale for the updated spliced power grid model section of the designated area, and storing the spliced power grid model section of the designated area with the time scale into the equivalent database of the external area network in the step (4-1);
(4-3) monitoring period T according to the state of the boundary of the designated area in the above step (4-1)1And (3) periodically monitoring the operation condition of the boundary line of the specified area in the step (4-1) in the power system, reading a specified area spliced power grid model section with a time scale, which is loaded closest to the current time, from the regional external network equivalent database in the step (4-2) when the operation state of the boundary line changes, simulating the operation state change of the boundary line and carrying out power flow calculation, carrying out power flow deviation comparison on the result of the simulated power flow calculation and the current power flow data of the power system, and counting the mean square error of the power flow deviation result to be used as an evaluation index of the rationality of the current specified regional external network equivalent model, wherein the smaller the mean square error of the power flow deviation result is, the closer the specified regional external network equivalent model is to the actual power grid external network model.
Claims (1)
1. A dynamic verification method for an external network equivalent model of a designated area in an electric power system is characterized by comprising the following steps:
(1) establishing an area external network equivalent database, acquiring model data information of a current power system from the power system and storing the model data information into the area external network equivalent database, wherein the model data information of the power system comprises: topological structure of power system, impedance parameters of power system equipment, branch tide of power system,The method comprises the steps that measurement data of power generation load flow and bus node voltage are used for carrying out state estimation calculation and flow calculation on a power system model, and the power system model section after calculation convergence is stored in an equivalent database of an external network of a region; configuring the boundary configuration of a designated region in an extraregional equivalent database, wherein the boundary configuration comprises the following steps: a designated area boundary station and a designated area boundary line; configuring real-time data acquisition period T of power system in regional external network equivalent databasedataAnd a specified zone boundary state monitoring period T1；
(2) Acquiring a CIM file of the external network equivalent model of the designated area and a power grid power flow E language file of the designated area from the external network equivalent model on-line generation system of the area, analyzing the external network equivalent model of the designated area and the power flow E language file, performing state estimation calculation and power flow calculation, and storing the calculated and converged section of the external network equivalent model of the designated area into the external network equivalent database of the step (1);
(3) reading a loaded power system model section, an appointed area external network equivalent model section and the boundary configuration of an appointed area from the external network equivalent database of the step (2), finishing the definition of an internal network boundary of the appointed area in the power system model section according to a boundary station and a boundary branch of the appointed area, finishing the splicing of the power system model section and the appointed area external network equivalent model section according to the generated internal network boundary of the appointed area, generating a spliced power network model section of the appointed area after splicing the internal network model of the appointed area and the external network equivalent model of the appointed area of the power system, and storing the spliced power network model section of the appointed area into the external network equivalent database of the step (2);
(4) starting a dynamic tide verification function of the designated area to complete verification of the external network equivalent model of the designated area, wherein the specific process is as follows:
(4-1) reading the real-time data acquisition period T of the power system from the regional external network equivalent database in the step (3)dataSpecified area boundary state monitoring period T1Splicing the power grid model sections of the boundary lines and the designated areas;
(4-2) according to the aboveThe real-time data acquisition period T of the power system in the step (4-1)dataAcquiring real-time power flow data of a power grid from the power system, mapping the real-time power flow data into the spliced power grid model section of the designated area in the step (4-1), updating the spliced power grid model section of the designated area, adding a current time scale for the updated spliced power grid model section of the designated area, and storing the spliced power grid model section of the designated area with the time scale into the equivalent database of the external area network in the step (4-1);
(4-3) the above-mentioned zone boundary state monitoring period T1And (3) periodically monitoring the operation condition of the boundary line of the specified area in the step (4-1) in the power system, reading the section of the specified area spliced power grid model with the time scale, which is loaded and closest to the current time, from the external area network equivalent database in the step (4-2) when the operation condition of the boundary line changes, simulating the operation condition change of the boundary line, carrying out simulated power flow calculation according to the operation condition, carrying out power flow deviation comparison on the result of the simulated power flow calculation and the power flow data of the current power system, counting the mean square deviation of the power flow deviation result, taking the mean square deviation as an evaluation index of the rationality of the current specified external area network equivalent model, wherein the smaller the mean square deviation of the power flow deviation result, the closer the specified external area network equivalent model is to the actual external area network model.
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