JP5556334B2 - Power system reliability evaluation system - Google Patents

Description

  The present invention relates to a power system reliability evaluation system for evaluating power system information required when operating a power system.

  In the power system, the power system is operated by accurately grasping the state of the power system at the power supply station. Since the behavior of the power system is a non-linear phenomenon, an appropriate numerical analysis technique is required to accurately grasp the state of the power system. To date, many power system operators have already realized a reliability evaluation system that uses SCADA (Supervisory Control And Data Acquisition) data to evaluate the stability of the operating state of the power system. Has been.

  In the future, it is expected that large amounts of uncertain renewable energy, such as solar energy and wind energy, will be introduced into the power system in large quantities. It is getting bigger.

  The reliability evaluation system needs to perform very advanced calculations. In addition, each power system has its own characteristics depending on the region and regulatory legislation, etc., and the required characteristic evaluation is different, and there are not many power system operators in the world. Under such circumstances, the power system operator actually introduces an expensive reliability evaluation system customized by the vendor.

  Here, as a power system monitoring control system, there is a system in which various data of power system substations are collected at a facility such as a control station to perform monitoring control. In addition, the data of each facility is stored for each facility using a unified interface, and only the address information indicating which data is stored in which facility is collectively managed by the management server, thereby efficiently converting the data. Some have been made accessible (for example, see Patent Document 1)

JP 2006-204041 A

  However, since power system operators have introduced vendor-specific reliability evaluation systems, information that contributes to maintaining reliability among power system operators and information for improving efficiency. Cannot be shared. For example, efficiency toward the realization of a low-carbon society is a common issue for power system operators, but since there are various reliability evaluation systems, specific joint work for realizing a low-carbon society can be realized. The information cannot be shared.

  Further, since the reliability evaluation system is customized by the vendor, the reliability evaluation system is rigid and cannot be flexibly updated. In addition, power system operators place the utmost importance on the continuity of the reliability evaluation system, so once a vendor has delivered, the maintenance of the reliability evaluation system can be handled exclusively, thus reducing the introduction cost. In addition to being unable to do so, competition among vendors has become inactive, and in the end, technological innovation tends to be difficult.

  An object of the present invention is to provide a power system reliability evaluation system that can share common information among power system operators and that can flexibly update and change the system and can reduce costs.

  The power system reliability evaluation system according to the invention of claim 1 stores system data that changes every moment of the power system as a measured state quantity, and uses a system state quantity calculated by using the measured state quantity as an operation state quantity. A system database storage unit for storing, and a system state database storage unit for individually calculating predetermined calculation state quantities based on measurement state quantities connected to the system database storage unit through a dedicated network and stored in the system database storage unit A plurality of state quantity calculation units stored in the monitoring network, a monitoring control database storage unit connected to the dedicated network and storing an instruction value for monitoring control to the power system, and connected to the dedicated network in the system database storage unit The grid of the power system specified by the grid operator using the stored measurement state quantity and calculation state quantity When containing the indicated value for the monitoring and control in the use state estimation computed result of the operation is characterized in that an arithmetic processing unit for storing the instruction value to the supervisory control database storage unit.

  A power system reliability evaluation system according to a second aspect of the present invention is the power system reliability evaluation system according to the first aspect of the present invention, wherein the information management server for managing the measurement state quantity and the calculation state quantity stored in the system database storage unit is the dedicated network. The information management server relates to a measurement state quantity and a calculation state quantity required for the estimation calculation when the calculation processing unit estimates and calculates the grid operation state of the power system designated by the grid operator. Information is transmitted to the arithmetic processing unit.

  According to the first aspect of the present invention, since the plurality of state quantity computing units individually compute the predetermined computation state quantities based on the measured state quantities, the computation state quantities are information common to power system operators. In addition, the system can be updated and changed flexibly by updating or changing the state quantity calculation unit. In addition, since the arithmetic processing unit estimates and calculates the system operating state of the power system specified by the system operator using the measurement state quantity and the arithmetic state quantity, the arithmetic processing unit does not need to have a calculation function for the arithmetic state quantity. The combination of the measurement state quantity and the calculation state quantity used for the estimation calculation can be freely changed. Furthermore, since maintenance can also be performed by updating and changing the state quantity calculation unit, the system is not customized and costs can be reduced.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the information management server performs the estimation when the arithmetic processing unit estimates and calculates the system operation state of the power system designated by the system operator. Since the information related to the measurement state quantity and the calculation state quantity necessary for the calculation is transmitted to the calculation processing section, the calculation processing section can quickly obtain the measurement state quantity and the calculation state quantity required for the estimation calculation.

The block diagram of the electric power system reliability evaluation system which concerns on embodiment of this invention. Explanatory drawing which shows an example of the process sequence of the estimation calculation performed by the calculation control part in embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a power system reliability evaluation system according to an embodiment of the present invention. System data that changes from time to time in the power system 11 is stored as a measured state quantity in the system database storage unit 13 via the information communication network 12. The measurement state quantity is, for example, the voltage, current, frequency, active power, reactive power, switch open / close state of each switch of the power system, etc., and defines the absolute time of the entire power network using GPS signals. Monitors monitoring data from advanced devices such as PMU (Phasor Measurement Unit) that directly observes the phase. In addition, data on factors that have a large impact on weather information and power system operation are also captured. This system database storage unit 13 is connected to a dedicated network 14.

  A plurality of state quantity calculation units 15a to 15n are also connected to the dedicated network 14, and the state quantity calculation units 15a to 15n individually calculate predetermined calculation state quantities based on the measured state quantities stored in the system database storage unit 13. Calculate and store in the system database storage unit 13.

  The state quantity calculation units 15a to 15n process the measurement state quantities of the system database storage unit 13 that are centrally managed without being bound by time synchronization, and respectively calculate the calculation state quantities that are predetermined in a cyclic manner. The calculated state quantity is a system characteristic based on physical property analysis, and is, for example, a future predicted value after a predetermined time of the measured state quantity, a tidal current at a predetermined location, a limit value thereof, or the like.

  Since the state quantity calculating units 15a to 15n are connected to the dedicated network 14, the number of the state quantity calculating units 15a to 15n can be easily increased or decreased. When a certain calculation state quantity is required in accordance with a change in the state of the power system, a state quantity calculation unit 15i for obtaining the calculation state quantity can be added, and when there is an unnecessary calculation state quantity Can delete the state quantity calculation unit 15j for obtaining the calculation state quantity.

  The calculation state quantities calculated by the state quantity calculation units 15a to 15n are stored in the system database storage unit 13 that is centrally managed. Therefore, when the predicted state value after the predetermined time of the measured state quantity is included as the calculation state quantity, the system database storage unit 13 is used to estimate not only the current data but also the near future system operation state. Data will also be stored.

  A plurality of arithmetic processing units 16 a to 16 m are connected to the dedicated network 14. The arithmetic processing units 16a to 16m perform estimation calculation of the system operation state of the power system designated by the system operator via the input / output devices 17a to 17m, and the measurement states stored in the system database storage unit 13 The estimation calculation is performed using the quantity and the calculation state quantity, and the calculation result is output to the input / output devices 17a to 17m and stored in a storage device (not shown). An appropriate GUI (Graphical User Interface) may be added to the interface between the input / output devices 17a to 17m and the arithmetic processing units 16a to 16m to make it easier to use.

  When the calculation values of the calculation processing units 16 a to 16 m include an instruction value for monitoring control of the power system 11, the instruction value is stored in the monitoring control database storage unit 18 via the dedicated network 14. The instruction value for monitoring control stored in the monitoring control database storage unit 18 is used as a setting value or a limit value of various monitoring control devices on the power system side. For example, it is used as a generator output change of a power system, a threshold value of a protective relay system operation, or the like. The instruction value for monitoring control is transmitted to various monitoring control devices on the power system side via the information communication network 12.

  An information management server 19 is connected to the dedicated network 14. The information management server 19 manages the measurement state quantity and the calculation state quantity stored in the system database storage unit 13, and when the calculation processing units 16a to 16m estimate and calculate the system operation state of the power system, Information related to the measurement state quantity and the calculation state quantity necessary for the estimation calculation is transmitted to the arithmetic processing units 16a to 16m. Thereby, the calculation control parts 16a-16m can acquire the measurement state quantity and calculation state quantity which are required for estimation calculation from the system | strain database memory | storage part 13 rapidly.

  FIG. 2 is an explanatory diagram illustrating an example of a processing procedure of an estimation calculation performed by the calculation control units 16a to 16m. FIG. 2 shows a calculation example of a high function LMP (Locational Marginal Price) by dynamic rating.

  The processing procedure of the estimation calculation executed by the arithmetic processing units 16a to 16m is configured by preparing software engineering expression means (syntax) that makes it possible to easily define the arithmetic processing procedure. For example, each procedure is a procedure that does not have the calculation function of the state quantity calculation units 15a to 15m, and the procedure that requires the calculation state quantity fetches the necessary calculation state quantity from the system database storage unit 13 and performs the estimation calculation. I do.

  Steps S1 to S4 in FIG. 2 are procedures that do not have the calculation functions of the state quantity calculation units 15a to 15m, and step S1 is a procedure that requires calculation state quantities.

  In the procedure of step S1, transmission line power flow restriction based on the stability index is determined. In order to determine the power line flow restriction based on the stability index, the power flow restriction L1 from the viewpoint of steady state stability, the power flow restriction L2 from the viewpoint of voltage stability, the power flow restriction L3 from the viewpoint of transient stability, and the power transmission line The flow restriction L4 and the short-time prediction system data D1 by heat management are required, but in the procedure of step S1, the state quantity calculation units 15a to 15a are not provided without the calculation functions of the power flow restrictions L1 to L4 and the system data D1. The result calculated by 15n is used. That is, the procedure of step S1 is a procedure for determining the transmission line power flow restriction using the power flow restrictions L1 to L4 and the system data D1.

  In the procedure of step S1, the power flow restrictions L1 to L4 and the system data D1 calculated by the state quantity calculators 15a to 15n and stored in the system database storage unit 13 are extracted, and the power transmission line power restrictions are determined. In the procedure of step S2, it is determined whether or not there is an LP (Linear Programming) calculation instruction from the power system operator.

  When there is an LP calculation instruction, LMP calculation by LP is performed by the procedure of step S3, and LMP (regional limit price) is output to the input / output device by the procedure of step S4.

  As described above, in the embodiment of the present invention, the calculation for analyzing the physical properties of the power system for reliability evaluation is the same regardless of the power system, but the dominant characteristic is the system configuration of the power system. Since these areas change depending on operating conditions, this part needs to be flexible enough to allow power system operators to customize it appropriately. Service oriented architecture (SOA) has been attracting attention since around 2004. The portion for calculating the physical property is provided with a plurality of state quantity calculation units 15a to 15n, which are configured to operate independently and cyclically as a calculation function.

  At this time, the time required for performing the calculation functions of the plurality of state quantity calculation units 15a to 15n varies and is asynchronous, and the processes are not synchronized. This is because it is not necessary to perform arithmetic processing in synchronization. As a result, flexibility is maintained. In the case of a power system, data analysis in the near future is also required. Therefore, not only the characteristics at the present time but also analysis based on data in the near future is executed in parallel.

  Power system operators can easily and accurately grasp the operating status of the power system by freely combining the service of the calculation results in the state quantity calculation units 15a to 15n disclosed on these systems. The processing procedure of the arithmetic processing units 16a to 16n for estimating and calculating the state can easily use the calculation results of the state quantity calculating units 15a to 15n. For example, we prepared a script-style process definition language system that can easily define process procedures. Of course, this processing procedure can improve flexibility by having an appropriate GUI.

  Further, the monitoring control database storage unit 18 is arranged so that not only the system characteristics can be grasped but also the instruction value for the monitoring control can be transmitted to the monitoring control device constructed in the lower information communication network 12. This also makes it possible to send settling data to the protection / control system, for example. As a result, a system that highly integrates the database technology, the SOA concept, and the actual power system protection control system has been realized.

  Furthermore, the state quantity calculation units 15a to 15n may be activated freely by the power system operator side according to the description of the processing procedure of the calculation processing units 16a to 16m, or the calculation of the state quantity calculation units 15a to 15n. The functions may mutually evaluate the validity of the calculation result. As a result, a power system reliability evaluation system that plays the role of a control tower for wide-area monitoring and control of the power system can be realized with a flexibility that cannot be compared with the conventional system.

DESCRIPTION OF SYMBOLS 11 ... Electric power system, 12 ... Information communication network, 13 ... System | strain database memory | storage part, 14 ... Dedicated network, 15 ... State quantity calculating part, 16 ... Calculation processing part, 17 ... Input / output device, 18 ... Monitoring control database, 19 ... Information management server

Claims (2)

  A system database storage unit that stores system data that changes every moment of the power system as a measurement state quantity, and that stores a system state quantity calculated using the measurement state quantity as a calculation state quantity, and a dedicated system database storage unit A plurality of state quantity calculation units that individually calculate predetermined calculation state quantities based on measurement state quantities that are connected by a network and stored in the system database storage unit, and store them in the system database storage unit, and the dedicated network System operation using a monitoring control database storage unit that stores instruction values for monitoring control to a connected power system, and a measurement state quantity and a calculation state quantity that are connected to the dedicated network and stored in the system database storage unit Estimate and calculate the system operating state of the power system specified by the operator, and Power system reliability evaluation system characterized by comprising the a arithmetic processing unit for storing the instruction value to the supervisory control database storage unit when included 示値. An information management server for managing measurement state quantities and calculation state quantities stored in the system database storage unit is connected to the dedicated network,
The information management server, when the arithmetic processing unit estimates and calculates a system operation state of a power system specified by a system operator, calculates information related to a measurement state quantity and an operation state quantity necessary for the estimation calculation. The power system reliability evaluation system according to claim 1, wherein the power system reliability evaluation system is transmitted to a processing unit.

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