JP2001157363A - Apparatus and method of controlling electric power system voltage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of controlling centralized monitor control electric power system voltage and an apparatus thereof, capable of facilitating the evaluation and the verification of the validity of control associated with changes in a system architecture or control knowledge, preventing generation of a control delay and excessive control, and attaining high operational efficiency. SOLUTION: An apparatus to be operated is determined based on a system database 5 and a knowledge base 6, and the decision is stored in a decision result database 7. The decision result database 7 for an arbitrary period is accumulated by a decision result performance accumulating part 8 as one set, and knowledge and system data corresponding to a future system is generated, based thereon, and simulated and edited by an electric system simulating part 11. The data is displayed on a display 3 respectively at arbitrary timing so that an operator can estimate the validity of the decision easily. The decision is made in consideration of future values after control time, thereby preventing generation of a control delay and excessive control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling a power system voltage, and more particularly, to comprehensively monitoring the entire power system under its control and operating a voltage transformer and a phase adjusting device to control a target voltage. The present invention relates to a power system voltage control method and a device suitable for application in maintaining the power system.

[0002]

2. Description of the Related Art Conventionally, in system control of an electric power system, remote monitoring, control, and measurement of a power distribution system and load devices connected thereto have been performed.

In order to stably supply high-quality power, it is necessary to maintain a constant voltage in the system and reduce voltage fluctuations. For this reason, as power system control, measurement and monitoring of a load amount, a voltage, and the like at a main monitoring point are performed, and a device for voltage adjustment is controlled according to the situation.

[0004] The control for maintaining the proper voltage in the power system is performed by an AVR (automatic control) for adjusting the output voltage of the generator.
Voltage Regulator: LRT (Load-ratio Control Transform) for automatic tap change of transformer and transformer
er: local control method in which control equipment typified by an on-load voltage adjustment transformer) is installed separately. In this method, for example, when a voltage value and a reactive power value at a specific monitoring point exceed a dead zone, a tap operation amount in a specific transformer is determined according to a deviation amount from a target value. .

[0005] However, when each of the transformers and the phase adjusting equipment is independently controlled, voltage fluctuations due to interference between the equipments and excessive operation of the equipments become problems. In addition, if the voltage monitoring dead zone is set to be large in order to suppress excessive operation, there is a problem in that control delay occurs. As an invention for solving this problem, a method described in Japanese Patent Application Laid-Open No. 6-284577 has been proposed. However, in the case of a local control method, it is difficult to efficiently control the system by taking into account the balance of the entire system because control is performed with limited information, and it is difficult to respond to changes in the system configuration. Have.

[0006] As a conventional voltage control of a power system, there is a schedule control for operating a phase adjustment facility based on an operation time set in advance in consideration of a load variation depending on a time zone. In the case of this schedule control,
Although the balance of the entire system can be considered to some extent, since the operation is performed at a preset time, there is a problem that it is not possible to cope with a sudden change in the state of the power system.

Furthermore, a centralized control system has been proposed in which the states of all the transformers and all the phase adjusting facilities in the target system are collectively managed at one place. As this centralized control method,
For example, an objective function representing economy (power loss of transmission line, etc.) and control effect (sum of absolute value error from each substation voltage, etc.) is determined, and this objective function is optimized for a certain time section. Method for finding the combination of equipment status (Sasaki et al. "Development of voltage / reactive power control support system II" 1995
IEEJ, Power Technology Study Group, PE-95-166).

However, in such a combination optimizing method, since all possible combinations of operations are evaluated, it takes a long time to process, and the optimization of the system state in a certain time section is difficult. Although it is guaranteed, if the control is continuously performed in real time, the operation will be biased or oscillated to specific equipment with high control effect, and it will be possible to balance the equipment state within continuous time There are problems such as inability to do so.

In view of the above, when it is necessary to perform quick, appropriate and flexible control, centralized control based on empirical judgment of the operator is mainly used. In such control, the burden on the operator is increasing with an increase in the scale of the system under the control and an increase in complexity.

As a solution to such a problem of the centralized type, Japanese Patent Application No. 10-2682 filed by the same applicant as the present application has disclosed.
No. 16, "Method and Apparatus for Power System Voltage Control". In this method, the configuration of a power system is classified into a plurality of system patterns, a method of classifying a voltage monitoring area corresponding to each system pattern, and a control method (control rules) performed by an operator.
Are stored in a knowledge base so that quick, appropriate and flexible voltage control can be performed according to a change in the configuration of the power system. In addition, there is a method of “power system voltage control method and device” described in Japanese Patent Application Laid-Open No. 11-215703 (Japanese Patent Application No. 10-017533) by the same applicant. In this scheme,
Applying fuzzy rules as a knowledge base to the parts that require the degree of operation of transformer equipment or phase adjustment equipment, which has a high degree of operator (human) judgment, to realize flexible and high-speed control close to operator judgment I have. Further, by using the schedule pattern of the required operation index value of the phase adjustment equipment created by judging from the daily load transition standard pattern as the judgment information, each equipment operation within a continuous time (for example, on a daily basis) can be performed. It is a method that can achieve harmony of the.

[0011]

However, Japanese Patent Application No. Hei 10
According to the methods disclosed in Japanese Patent Application No. 017533 and Japanese Patent Application No. 10-268216, when the system configuration and control knowledge are changed due to new installation or expansion of equipment, it takes time to evaluate and verify the validity of the control. It is difficult for the operator to understand the reason why the control device determined by the system is derived, since the degree of establishment of the rule by the general-purpose tool is only shown.

The method of determination disclosed in these publications is a determination based on data that is past (actual) from the determination time, and the time at which control is performed (future after the determination time).
It is not a judgment based on the data. Therefore, at the time of a sudden change in the load, the control point and the system status are different from each other, so that control delay and overcontrol may occur.

In order to solve the above-mentioned problems, the present invention facilitates the evaluation and verification of the validity of control accompanying a change in the system configuration and control knowledge, and furthermore, the control determined by the control device as a control result. The reason for deriving the equipment should be presented in an easy-to-understand manner, and it is easy for operators to use.
It is an object of the present invention to provide a centralized monitoring and control type power system voltage control method and its device with high operation efficiency.

Further, the present invention provides a centralized monitoring and control type power system voltage capable of avoiding the occurrence of control delay and overcontrol at the time of a sudden change in load in a radially operated power system and performing efficient control on a steady basis. It is an object to provide a control device.

[0015]

According to a first aspect of the present invention, there is provided a power system voltage control apparatus comprising: a system database, a knowledge base, a first voltage control operation determining means, a first determination result database, and a display. Means.

The system database stores information on the configuration and status of the facilities in the jurisdiction system by classifying them into system patterns to be monitored. The knowledge base stores rules and determination constants necessary for determining the necessity of device operation for each system pattern.

The first voltage control operation determining means determines a device to be operated in the current system state based on the information stored in the system database and the knowledge base. First
The determination result database stores the determination result by the first voltage control operation determining means.

The display means outputs a display based on the determination result in the first determination result database. Further, the power system voltage control apparatus of the present invention has a configuration for confirming a control effect before operation, as a result of determination result accumulation means, a knowledge / system data editing means, a second voltage control operation determination means, a second determination. The system further includes a result database, a power system simulation unit, and a knowledge / system data registration unit.

The judgment result accumulating means accumulates a plurality of sets in association with the system database and the knowledge base corresponding to the judgment result by the first voltage control operation judging means in an arbitrary period.

The knowledge / system data editing means changes based on the judgment result corresponding to the stored arbitrary system database and knowledge base. The second voltage control operation determining means determines a device to be operated based on the changed system database and knowledge base.

The second judgment result database is the second judgment result database.
The determination result by the voltage control operation determining means is stored. The electric power system simulating means simulates a change in the system state based on the determination result in the second determination result database.

The knowledge / system data registering means stores the system database and the knowledge base for which the evaluation and verification of the control effect have been completed by the judgment by the second voltage control operation judging means or by the simulation by the electric power system simulating means. Is replaced with a system database and a knowledge base used for the determination by the voltage control operation determination means.

In the case of this configuration, the display means comprises: a judgment result by the second voltage control operation judging means; a judgment result based on the system database and the knowledge base accumulated by the result accumulating means; Are compared and displayed.

The display means has, for example, control status display means, control status display means, and determination reason display means. The control status display means displays each voltage value on a power system diagram that displays a system state such as a voltage value, a power flow value, and a device state at an arbitrary time, or displays a level meter of each voltage value, or before an arbitrary time at each electric power plant. The trend data for a certain period of time is superimposed on a power system diagram for displaying a system state and displayed in a graph.

The determination reason display means displays the control commands determined by the first voltage control operation determination means or the second voltage control operation determination means in chronological order. Then, when one of the displayed control commands is selected by the operator, the operation necessity and operation determination for the past designated time from the time of the control command are performed for each device corresponding to the selected control command. A threshold value and the degree of approaching scheduled operation time of the related phase adjustment equipment are displayed in a graph.

The judgment result evaluation information display means displays a graph of the voltage distribution of the electric station bus for an arbitrary period with respect to an arbitrary control result, the number of judgments, the target voltage, the average voltage, the upper limit voltage deviation number, and the lower limit voltage deviation number. Is displayed in tabular format.

According to the first embodiment of the present invention, even when the system configuration or the control knowledge is changed due to new installation or expansion of equipment, the evaluation and verification of the validity of the control based on the determination after the change is performed. 2 can be easily obtained from the judgment by the voltage control operation judging means and the simulation result by the power system simulating means. In addition, since the determination result based on the system configuration and control knowledge of each stage is displayed and output to the operator along with information such as the basis of the determination by the display means, the control device determined by the voltage control process as the control result is derived. Is easy for the operator to understand, and operation with good usability and work efficiency can be performed.

A power system voltage control apparatus according to a second embodiment of the present invention includes a system state actual value acquisition unit, a past system state database, a load prediction unit, a voltage control operation determination unit, and an operation command execution unit.

The system state actual value acquiring means acquires the state quantity of the power system to be controlled. The past system state database accumulates the acquired state amount and system configuration information at that time as actual values for a specified period.

The load prediction means predicts a future state quantity from the actual values stored in the system state database. The voltage control operation determining means determines the control equipment to be operated and the content of the operation from the actual value in the past system state database and the predicted value of the state quantity by the load predicting means.

The voltage control operation determining means operates based on, for example, a system state predicted value correcting means for performing a correction for providing continuity between the actual value and the predicted value, and a system state in the past and the system state at the time of control execution. It has operation target equipment determination means for determining a control equipment to be operated. Thus, the voltage control operation determining means can use not only the actual value but also the predicted value for the determination.

The voltage control operation determining means further calculates a future system state change tendency calculating means for calculating a system state change tendency before the control execution time based on the predicted value corrected by the system state predicted value correcting means. May be provided. In this case, the operation target equipment determination unit determines the control equipment to be operated in consideration of the system state at the time of determination and the system state prior to the control execution time. Can be determined.

When the future system status database is updated, the voltage control operation determining means calculates the scheduled operation time of the control equipment on the control date based on the predicted value in the future system status database. The configuration may further include a phase adjustment facility operation request signal creating unit that creates an operation request signal corresponding to the scheduled time. In this case, the operation target equipment determining means determines the equipment to be operated in consideration of the coordination of the control equipment based on the operation request signal.

The operation command execution means executes an operation based on the result of the determination. According to the power system voltage control apparatus of the second embodiment of the present invention, in addition to the actual value of the system state such as each load amount in the jurisdiction system, it is possible to make a control determination in consideration of future prediction information, Can be determined based on the system state at the time of execution of the control and the system state several cycles ahead. Therefore, control delay can be avoided and overcontrol can be prevented.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a system configuration of a power system voltage control device according to the present embodiment. In the present embodiment, the power system voltage control device includes a voltage control process execution unit 1,
A voltage control processing evaluation / verification unit 2 and a display unit 3 are provided.

The voltage control processing execution unit 1 is a system used for controlling each system equipment in actual operation, and includes a judgment result database 4a, a system database 5a, a knowledge base 6a, and a voltage control operation judgment unit 7. The system database 5a includes system configuration information indicating the attributes (phase adjustment facility capacity, etc.) and system configuration of each system facility in the electric power system under its control, voltage values sent from the power system monitoring and control processing device 20, The current state information of each system equipment in the system such as the load amount, the on / off state of the device, the tap position, and the like is described in, for example, Japanese Patent Application No.
The data is classified into system patterns by the classification method disclosed in Japanese Patent No. 268216 and stored in a form linked to data on the knowledge base 6a. The knowledge base 6a stores rules and determination constants necessary for determining the degree of operation necessity of each device for each system pattern. Voltage control operation determination unit 7
Determines the devices to be operated in the current system state based on information from the system database 5a and the knowledge base 6a by periodic startup. Then, as a result of the determination, a device to be finally operated in the current system state, determination reason information, control status information, and determination result evaluation information at that time are created and stored in the determination result database 4a.

The result of this determination is notified to the power system monitoring and control processing device 20 as control command information, and the power system monitoring and control processing device 20 controls each facility based on the information. At this time, the determination result can be visually displayed on the display unit 3 together with various trend information on the power system monitored and controlled by the system and provided to the operator at an arbitrary timing according to an instruction of the operator. . From these display information, the operator confirms the trend status of the equipment, the determination result of the voltage control operation determination unit 7 and the basis thereof, and sends a control command for each facility to the power system monitoring control processing device 20 based on the determination. You can make a final decision on whether or not.

The voltage control processing evaluation / verification unit 2 is a system that verifies and edits each database in order to cope with a future system configuration due to a change in the system configuration such as frequent installation, addition, or update of equipment. . In the voltage control processing evaluation / verification unit 2, the voltage control operation determination unit 7 makes a determination based on the data in actual operation and accumulates it as the determination result database 4a. One set is associated with the system database 5a and the knowledge base 6a used for the determination. Then, the judgment result actual accumulation unit 8 stores these as the judgment result database 4, the system database 5, and the knowledge base 6. Then, based on the determination result database 4, the system database 5 and the arbitrary databases in the knowledge base 6 having a plurality of sets, the knowledge / system data editing unit 9 generates new knowledge / system data corresponding to the future system state or the like. The stored system database 5b and knowledge base 6b are generated. And a system database 5 corresponding to this future system state
b and the knowledge / systematic data in the knowledge base 6b,
The voltage control operation determination unit 10 determines a device to be operated, and stores it in the determination result database 4b together with determination reason information, control status information, determination result evaluation information, and the like.

In the voltage control processing evaluation / verification unit 2, the power system simulation unit 11 evaluates the knowledge base 5b and the system database 6b changed according to the future system configuration,
Perform verification and confirm the control effect of the change before operation.
The power system simulating unit 11 pulls out the determination result by the voltage control operation determining unit 10 from the determination result database 4b, and controls the device such as switching of use / non-use of the phase adjustment equipment and change of the number of tap stages as the determination result. Calculate the power flow when operating the equipment with the reflected power, calculate the active power and reactive power at that time, and simulate a change in the system state when the system is actually operated.

At this time, the voltage control processing evaluation / verification unit 2 can visually provide each information to the operator through the display unit 3 at an arbitrary timing according to the instruction of the operator. In this case, the display unit 3 displays the determination reason information, the control status information, the determination result evaluation information created by the voltage control operation determination unit 10 based on the changed system database 5b and the knowledge base 6b, and the determination result actual accumulation unit 8 Alternatively, the determination reason information, the control situation information, and the determination result evaluation information accumulated by the knowledge / system data editing unit 9 are compared and presented, so that the operator can compare and display the compared and displayed system database and knowledge base before and after editing. The control effect after the change of the data can be compared and evaluated from the change of the data. Then, reflecting this result, the knowledge base 5b and the system database 6
Update the knowledge and systematic data of b. Then, with the change of the actual power system, the knowledge / system data registration unit 12 completes the evaluation / verification of the control effect by the system database 5b.
And the knowledge base 6b are replaced with the system database 5a and the knowledge base 6a of the voltage control processing execution unit. In addition, at a given timing according to the operator's instruction, the knowledge / system data editing unit sets the judgment result database 4, the system database 5, and the knowledge base 6 in one set with the corresponding system database 5 b and knowledge base 6 b. Is stored as

The display unit 3 visually displays various information on the power system monitored and controlled by the system in various forms as required by the operator. The display unit 3 in FIG. 1 includes a control result evaluation information display unit 31, a control status display unit 32, and a determination reason display unit 33.

FIG. 2 is a diagram showing an example of a screen display by the control status display section 32. The control status display unit 32 displays trend data and system status such as voltage values, power flow values, and device statuses at various positions in the power system for a certain period of time before the determination time of each electric station specified by the operator. This is displayed and output over the system diagram.

In the display example of FIG. 2, a tree-like hierarchical connection configuration from a higher-level system, and devices such as a transformer, phase adjusting equipment such as a static capacitor SC and a shunt reactor ShR, and a circuit breaker installed in the system are shown. Is displayed. Also, the current voltage level and target voltage at each substation are
It is displayed as a level meter having a memory indicating the deviation value of the upper and lower limits with the target voltage defined in advance as the center, and the active power amount and the reactive power amount flowing through each transmission line are expressed as “<active power amount> + j <inactive Power amount>".

On the display screen of the control status display section 32, each voltage value on the power system diagram is represented not only by numerical display but also by a graphical display method called a voltage level meter. The trend situation of each facility in the jurisdiction system can be visually recognized, and the voltage balance state of the entire jurisdiction system can be grasped at a glance.

FIG. 3 is an example of a screen display form of a trend graph of the voltage value and the active power amount by the control status display section 32. The display example of FIG. 3 shows a simulation result of a change in voltage level due to the operation of the phase adjusting device in the electric substation 1 and the electric substation 3, and the change in the tap position of the electric substation 1 and the accompanying change in the electric substation 1 are shown. The change of the voltage level and the change of the voltage level of the electric station 3 due to the use / non-use switching of the static capacitor of the electric station 3 are displayed in time series.

On the display screen of FIG. 3, trends such as voltage values, power flow values, and device states for a certain period of time before the judgment time of each substation are superimposed on the power system diagram for displaying the system status.
Since the graph is displayed with the time on the horizontal axis, the operator can grasp the control effect in chronological order.

FIG. 4 shows an example of a screen display form for displaying control commands issued in the past by the determination reason display section 33.
The example shown in the figure is an example of a screen on which control commands performed by two simulations are compared and displayed. The process of performing a simulation result of performing a comparison between a result of a simulation performed this time and a result stored and accumulated in the past and its processing Display results with time.

On the display screen, when the operator selects any of the control commands displayed by the pointing device such as a mouse, the operator selects any of the control commands as the basis information for the determination of the execution of the control command and outputs the information at the determination time. The trend of the operation necessity, the operation judgment threshold value, and the scheduled operation time approximation of the related phasing equipment for the past designated time from the judgment time of the device are displayed in a graph.

FIG. 5 shows an example of the display form. The figure shows the basis of the judgment that the command to turn on the static capacitor at the xx electric station performed at time 9:11 is performed. The tap operation, the SC1 operation, the SC2 operation, the SC3 operation, and the SC4 operation are performed. As a judgment basis for each operation, the change over time of the operation necessity and the planned operation proximity is
The graph is displayed together with +/- threshold values.

The degree of operation necessity indicates the degree of necessity of operating each device. For example, in the case of a tap, the +1 side corresponds to raising the tap and the -1 side corresponds to lowering the tap. In the case of SC, the +1 side uses SC,
The -1 side corresponds to non-use. In addition, the SC scheduled for operation is used (not used) in the voltage control business operation in order to respond to the daily load fluctuation according to the load fluctuation.
Shows how close the scheduled time to be to the scheduled time is to the scheduled time.

In the conventional system, the operation is unconditionally performed at the scheduled time regardless of the system status, whereas in the present system, the operator selects the selected operation from the display screen of the determination reason display section 33. Can be easily recognized by the visual display, and the validity of the judgment can be efficiently evaluated.

As described above, on the display screen of the determination reason display section 33, the control commands (determination time, equipment to be operated, operation details) determined by the power system voltage control device are displayed in chronological order. It is easy to grasp the reason why the control device was derived. In addition, as shown in FIG. 5, in response to a control command selected by the operator, the operation necessity, operation decision threshold, and operation scheduled time of the related phase adjustment facility for the specified time from the time are determined for each device. Since the graph is displayed as one graph with the horizontal axis representing time, the operator can easily recognize the basis of the control operation by visual display, and can efficiently evaluate the validity of the determination.

FIG. 6 shows an example of a display form of the evaluation information of the control effect as a result of the device operation by the control result evaluation information display section 31. The figure performs voltage measurement during an arbitrary period, and evaluates the control effect based on statistical information such as the voltage distribution of each electric station bus, the number of determinations, the target voltage, the average voltage, the number of upper limit deviations, and the number of lower limit deviations. In the example displayed as information, the graphs of the voltage measured as the voltage distribution at each substation and the number of times of measurement are plotted between the previous measurement value (the shaded graph in the figure) and the current measurement value (the black Graph), and the statistical information value is displayed below the numerical value by comparing the current value with the previous value.

The display screen of the control result evaluation information display section 31 allows the operator to obtain a graph of the voltage distribution of the electric power station bus, the number of determinations, the target voltage, the average voltage, and the upper limit for the control results of any arbitrary period. Since the number of voltage deviations and the lower limit voltage deviations are displayed in a table format, the operator can evaluate the overall control effect. Next, a second embodiment will be described.

FIG. 7 is a block diagram showing the configuration of the power system voltage control device according to the second embodiment. Hereinafter, the operation of the power system voltage control device of FIG. 7 will be described.

The power system voltage controller 40 shown in FIG. 7 includes a system state actual value acquisition unit 41, a past system state database 42,
A load prediction unit 43, a future system state database 44, a voltage control operation determination unit 45, an operation command execution unit 46, and a determination result database 47 are provided.

The system status actual value acquisition unit 41 is provided with a bus voltage, a transformer power flow, a line power flow, a load power amount, a circuit breaker, a disconnector, etc., at a certain period from measuring instruments installed in each facility of the power system. The system status such as the ON / OFF state of the power supply and the transformer tap position is fetched and stored in the past system status database 42 for a certain period as an actual value. At this time, the system status actual value acquisition unit 41 also stores equipment information necessary for power flow calculation such as line impedance and transformer capacity at that time.

At this time, the system status actual value acquisition unit 41
Calculates an estimated value for a state quantity that is not always measured or a missing state quantity, and stores the estimated value in the past system state database 42. Various methods are conceivable for obtaining the estimated value. One of the methods is a method disclosed in “Power System Power Flow Monitoring Device” of Japanese Patent Application No. 10-257950 filed by the same applicant as the present application. .

The load predicting unit 43 generates a predicted value from the actual value, based on the data stored as the actual value in the past system status database 42, the past weather data and the time integrated value of the load. The terminal load power in the future (for example, for the current day, for the next day) is predicted for a time at the same interval as the acquisition period of the system state actual value acquisition unit 41, and the predicted value is stored in the future system state database 44. .

As one of the prediction methods by the load prediction unit 43, there is a “power system power flow monitoring device” of Japanese Patent Application No. 10-257950 mentioned above. The above estimation method is
The present terminal state quantity is estimated using the characteristics of the radial system. The method of estimating the terminal load by this method is that the correlation between the power flow at the entrance of the radial system (transmission line outlet or the secondary side of the system transformer) and each terminal load in the radial system is strong. Using the characteristics, each end load is calculated from the tidal flow (end load source) at the entrance of the radial system.

That is, the total load of a certain radial system (partial system) can be obtained by the following equation (1) when the loss of active power is ignored. ΣPn = ΣPi-Po + ・ ・ ・ Pg (1) (； Pn; total current load of the sub-system ΣPi; total active power flowing into the sub-system ΣPo; total active power flowing out of the sub-system ΣPg; (The total active power value generated in the sub-system) Then, from the total load amount of the sub-system obtained by the above equation (1), each terminal load can be estimated by the following equation (2). .

Pni = ΣPn × Pwi ÷ ΣPwi (2) (Pni; load at the i-th terminal load end (terminal load;
Instantaneous value) Pwi; Time average value (Wh value) of past load amount at i-th terminal load end ΣPwi; Sum of time average value (Wh value) of past load amount) 量 Pn in equation (2) Is based on the telemetry value of the outlet of the transmission line to which the terminal load is supplied and the system transformer.
Pwi is obtained from the reference value and the current flow data, and ΣPwi is obtained from the sum of the time averages of the past terminal loads.

The voltage control operation determination unit 45 shown in FIG. 7 periodically determines the equipment to be operated and its operation based on the data of the actual value in the past system status database 42 and the predicted value in the future system status database 44. Judge the content,
System status predicted value correction unit 51, future system status change tendency calculation unit 52, operation target equipment determination unit 53, phase adjustment facility operation request signal creation unit 54, and phase adjustment facility operation request signal database 5
5 is provided.

The system state predicted value correction unit 51 corrects the predicted value of each terminal load power from the actual value. FIG.
5 is a flowchart showing a schematic procedure of a correction process for a load by the system state predicted value correction unit 51.

In the figure, first, the system state predicted value correction unit 5
First, noise is removed from the actual value of each terminal load power stored in the past system state database 42 and the predicted value stored in the future system state database 44 (step S1). As a noise removal method, for example, a moving average process is performed on values at a plurality of periodic points around a target time, such as at a certain time and before and after the actual value and the predicted value, for example. When this method is used for a period point immediately before and after the target time, a moving average value up to one cycle before the current time is obtained as the actual value.

Next, in order to ensure continuity between the actual value and the predicted value of each load power, in step S2, the actual value and the predicted value in one cycle before the judgment time coincide with each other after the current time, that is, in the future. The moving average of the predicted value is corrected according to the following equation. Predicted value moving average correction value (t) = (actual value moving average value (T-1) / predicted value moving average value (T-1)) x predicted value moving average value (t) ... (3) Here, t indicates the time at which the value is to be calculated, and T-1 indicates the time one cycle before the current time.

The correction value of the predicted value obtained from the equation (3) is used as the predicted value after noise removal. In step S3, a power flow calculation is performed using the predicted value after noise removal obtained in step S2 as the predicted value of each terminal load power and the actual value after noise removal as the past time. The system status for the time required by the determination unit 53 is obtained, and output to the operation target facility determination unit 53 and the future system status change tendency calculation unit 52.

The operation target equipment determining unit 53 determines the equipment to be operated and the contents of the operation based on the load and voltage predicted values obtained by the system state predicted value correction unit 51, and determines the determination result. It is stored in the database 47. The determination can be made in the same manner as in the “power system voltage control device” of JP-A-11-215703, but it can also be determined using another method.

The operation target equipment determination unit 53 uses the system state after noise removal at the control time as the determination data,
When calculating the amount of change, the determination is made using the system state after noise removal one cycle before the control time. FIG. 9 shows an example.

The operation target equipment determination unit 53 uses the predicted value from the system state predicted value correction unit 51 as a future value for the determination data. FIG. 9 shows the case of the moving average score of 3,
In the determination shown as the current value in the figure, the device to be operated and the operation content are determined by using the actual value at the determination time, the future value of the control time one cycle ahead and the future value one cycle ahead. Is determined. Further, when calculating the change amount, the determination time shown as the previous value in the drawing, the actual value one cycle before that, and the future value one cycle ahead of the determination time are used.

FIG. 10 shows an example in which the judgment is made only with the actual value, which has been performed conventionally. This figure shows a case where the moving average score is 3, and only actual values are used as data used for determination. When comparing the method of determination shown in FIG. 10 with the determination by the operation-targeted equipment determining unit 53 shown in FIG. 9, compared with the determination method based on only the actual values before the determination time in FIG. In the determination method of FIG. 9, since the determination can be made based on the value centered on the system state at the time of the control, control prior to the conventional method of FIG. 10 can be performed.

The part to be judged is described in the above-mentioned JP-A-11-21.
When the configuration of the “power system voltage control device” described in Japanese Patent No. 5703 is changed to the configuration of the second embodiment, it is not necessary to change the control logic, and the setting of the current value and the previous value is changed in the future. It can be realized only by shifting by one or two periods, respectively.

A phase adjusting facility operation request signal creating section 54 shown in FIG.
Is the timing at which the predicted value of the load of the current day or the next day stored in the future system state database 44 is updated,
The degree of necessity of operating each phase adjustment facility at each time is determined based on the load power amount, and an operation request signal corresponding to the time is created. The phase adjustment facility operation request signal creation unit 54 calculates the scheduled operation time of each phase adjustment facility on the control day based on the data in the future system status database 44, and converts the created operation request signal into the phase adjustment facility operation request signal database. 55.

FIG. 11 shows a phase adjustment facility operation request signal creating section 5.
4 is a flowchart illustrating a schematic procedure of generating an operation request signal according to a fourth embodiment. The phase adjustment facility operation request signal creating unit 54 first determines whether or not to create a predicted value for the next day in step S11, and when it is to create a predicted value for the next day (step S11).
11, Yes), as step S12, a phase adjustment facility operation schedule for the next day is created.

As a method of preparing the operation schedule of the phase adjustment equipment, for example, a threshold value is determined in advance by simulation with respect to a load affecting the operation of the control equipment from the relationship with the allowable upper and lower limit voltage values. Is used as a reference value, and the corresponding time is the time of operation (input or release) of the phase adjustment equipment. Then, the request degree at that time is set to 1 in the case of closing and -1 in the case of opening, and the request degree corresponding to the load amount is set between 1 and -1 centering on that.

After the completion of the adjustment design operation schedule for the next day or when the schedule for the next day is not created in step S11 (No in step S11), the creation or change of the forecast value for the current day (the next day for the previous day) Is determined (step S13), and if different (step S13, No), the process ends. Also, when it is the creation or change of the forecast value for the current day (step S13, Ye
In step s), a phase adjustment facility operation schedule for the day is created (step S14), and the process ends.

The operation target equipment determination unit 53 considers the coordination of each control equipment based on the phase adjustment equipment operation request signal in the phase adjustment equipment operation request signal database 55 stored by the phase adjustment equipment operation request signal creation unit 54. To determine the equipment to be operated.

The future system state change tendency calculating section 52 shown in FIG.
Is called when the operation target equipment determination unit 53 makes a final determination to determine whether or not to perform an operation on the phase adjustment equipment listed as an operation target candidate, and performs simulation from the control time to several cycles ahead. .

The future system state change tendency calculating section 52 calculates the power flow from the control time to several cycles ahead, judges from the difference between the monitored voltage state and the voltage allowable upper / lower limit value or the target voltage value, and adjusts. It is finally decided whether or not to operate the phase equipment. For example, as shown in FIG. 12, even if the voltage value does not show a tendency to change (increase) at the determination time, as a result of the preliminary evaluation from the control time by simulation to several cycles ahead, the voltage suddenly starts several cycles after the determination time. If it is evaluated that the voltage is changed (increased) and deviates from the allowable value, it is determined that it is more effective to perform the control of lowering the voltage in advance, and the operation is performed even if the operation request degree of the equipment is low. Equipment to be determined. Conversely, as shown in FIG. 13, even if the change in the voltage value is large and the degree of operation request is high, the control is performed when it is evaluated that the value does not deviate from the allowable value even after several cycles from the determination time as a result of the preceding investigation by simulation. It is determined that it is more effective to do so, and the corresponding phase adjustment equipment is not considered as the operation target. By this future system state change tendency calculating unit 52,
For example, if the load change at the determination time is a gradual increase (decrease) but abrupt increase (decrease) several minutes later is obtained from the simulation result, the SC is turned on or the tap is raised (SC is released or the tap is released). The control delay can be avoided by performing the operation in advance. Also,
At the time of judgment, the load is increasing (decreasing) and the voltage is deviating from the lower limit (upper limit), but after several minutes the load is decreasing (increase).
Then, if evaluated, the insertion of SC or the raising of the tap (S
The operation of opening C or lowering the tap) need not be performed.

The control command execution unit 46 issues a control command to the power system monitoring control processing unit 20 based on the determination result output to the determination result database 47 by the voltage control operation determination unit 45.
Send to This determination result is a determination result made in consideration of a future value before the control time, and has already been inserted for a sudden load change that may occur in the future, so that control delay and overcontrol may occur. Can be avoided.

[0081]

According to the present invention, even when the system configuration or control knowledge is changed due to new installation or expansion of equipment, it is easy to evaluate and verify the validity of the control based on the determination after the change. In addition, the reason for deriving the control device determined by the voltage control process as a control result is presented to the operator in an easily understandable manner, so that operation with high usability and work efficiency can be performed.

Further, according to the present invention, in addition to the actual data of the system status such as each load amount in the jurisdiction system, the control judgment can be made in consideration of the future prediction information. It is possible to make a determination based on the system state or the system state several cycles ahead. Therefore, it is possible to avoid a control delay or an overcontrol at the time of a sudden change in load, and to perform a centralized voltage control capable of performing efficient control constantly.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration of a power system voltage control device according to a first embodiment.

FIG. 2 is a diagram showing an example of a display form of a voltage level meter by a control status display unit.

FIG. 3 is a diagram showing an example of a display form of a trend graph by a control status display unit.

FIG. 4 is a diagram showing an example of a display mode of a device operation command history by a determination reason display unit.

FIG. 5 is a diagram showing an example of a display form of determination basis information by a determination reason display unit.

FIG. 6 is a diagram showing a display form example of statistical information by a determination result evaluation information display unit.

FIG. 7 is a block diagram illustrating a configuration of a power system voltage control device according to a second embodiment.

FIG. 8 is a flowchart illustrating a schematic procedure of a correction process in a prediction system state correction unit.

FIG. 9 is an image diagram of data used for determination by an operation target facility determination unit.

FIG. 10 is an image diagram of data used in a conventional determination using only actual values.

FIG. 11 is a flowchart illustrating a schematic processing procedure of a phase adjustment facility operation request signal creation unit.

FIG. 12 is a voltage change illustrating a determination method of a future system state change tendency calculation unit (control is required as a result of a preceding evaluation);
It is a figure showing an example.

FIG. 13 is a diagram illustrating an example of a voltage change (a control is not required as a result of a preceding evaluation) for explaining a determination method of a future system state change tendency calculation unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Voltage control processing execution part 2 Voltage control processing evaluation / verification part 3 Display part 4 Judgment result database 5 System database 6 Knowledge base 7, 10, 45 Voltage control operation judgment part 8 Judgment result accumulation part 9 Knowledge / system data editing part 11 power system simulation unit 12 knowledge / system data registration unit 20 power system monitoring and control processing unit 31 control result evaluation information display unit 32 control status display unit 33 decision reason display unit 40 power system voltage control unit 41 system state actual value acquisition unit 42 Past system state database 43 Load prediction unit 44 Future system state database 46 Operation command execution unit 47 Judgment result database 51 System state predicted value correction unit 52 Future system state change tendency calculation unit 53 Operation target equipment determination unit 54 Phase adjustment equipment operation request Signal creation unit 55 Phase adjustment facility operation request signal database

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsuhisa Kameya 1st Fuji-cho, Hino-shi, Tokyo Inside FFC Corporation (72) Inventor Fumitaka Okochi 1st Fuji-cho, Hino-shi, Tokyo Incorporated FFC F term (reference) 5G066 AA03 AA09 AE01 AE05 AE07 AE09 DA01 DA04 5H004 GA16 GA30 GB06 HA14 HB14 JA22 JB08 KA03 KA05 KC23 KC24 KC25 KC27 KD52 LA15 LA18 MA40 MA49 MA50

Claims (15)

[Claims] A system database that classifies and stores information on the configuration and status of equipment in a jurisdiction system into system patterns to be monitored, and rules and rules necessary for determining the necessity of operating devices for each system pattern. A knowledge base for storing a determination constant, first voltage control operation determination means for determining a device to be operated in the current system state based on the information stored in the system database and the knowledge base, and the first voltage control A first determination result database that stores a determination result by the operation determination unit; and a display unit that displays and outputs based on the determination result in the first determination result database. Power system voltage control device. 2. A result-of-judgment accumulating means for accumulating a plurality of sets in association with the system database and the knowledge base corresponding to the judgment result of the first voltage control operation judging means in an arbitrary period; Knowledge / system data editing means for changing based on the determined arbitrary system database and the determination result corresponding to the knowledge base, and a second device for determining a device to be operated based on the changed system database and knowledge base A voltage control operation determining means, a second determination result database storing a determination result by the second voltage control operation determining means, and a system state based on the determination result in the second determination result database. Power system simulating means for simulating a change, and control by determination by the second voltage control operation determining means or simulation by the power system simulating means Evaluation of the results -
A knowledge / system data registering unit for replacing the system database and the knowledge base for which the verification has been completed with the system database and the knowledge base used for the judgment by the first voltage control operation judging unit; And comparing and displaying at least two of the determination result by the voltage control operation determining means, the determination result based on the system database and the knowledge base accumulated by the result and result accumulating means, and the simulation result by the electric power system simulating means. The power system voltage control device according to claim 1, wherein 3. The display means includes a control status display means for displaying each voltage value on a power system diagram for displaying a system state such as a voltage value, a power flow value, and a device state at an arbitrary time. The power system voltage control device according to claim 1 or 2, wherein: 4. The control means according to claim 1, wherein said display means includes a control status display means for displaying trend data for a certain period of time before an arbitrary time at each substation on a power system diagram for displaying a system state in a graph. The power system voltage control device according to claim 1 or 2, wherein: 5. The display device according to claim 1, wherein the display means includes a determination reason display means for displaying a control command determined by the first voltage control operation determination means or the second voltage control operation determination means in a time series. Any one of claims 1 to 4
4. A power system voltage control device according to any one of claims 1 to 3. 6. The determination reason display means determines the operation necessity and operation for a specified time in the past from the time of the control command for each device corresponding to the selected control command among the displayed control commands. The power system voltage control apparatus according to claim 5, wherein the threshold value and the degree of approach to the operation of the related phase adjustment facility are displayed in a graph. 7. The display means displays a graph of a voltage distribution of an electric station bus for an arbitrary period with respect to an arbitrary control result,
And a determination result evaluation information display means for displaying a determination format, a target voltage, an average voltage, an upper limit voltage deviation count, and a lower limit voltage deviation count in a tabular format.
The power system voltage control device according to any one of the above. 8. A system database for classifying and storing information on the configuration and state of the equipment in the jurisdiction system into system patterns to be monitored, and information on the configuration and state of the equipment in the jurisdiction system.
Based on the information stored in the knowledge base that stores the rules and judgment constants necessary to determine the degree of operation of the equipment for each system pattern and the system database that is classified and stored in the system pattern to be monitored. A device to be operated is determined, the determination result is stored in a first determination result database, and a display is output based on the determination result in the first determination result database. Power system voltage control method. 9. A system status actual value acquiring means for acquiring a state amount of a power system to be controlled, a past system state database for accumulating the acquired state amount and system configuration information at that time as an actual value for a specified period, and A load estimating means for estimating a future state quantity from the actual value accumulated in the system state database; and an operation value based on the actual value in the past system state database and the predicted value of the state quantity by the load estimating means. A power system voltage control device comprising: a control facility; a voltage control operation determination unit that determines the content of the operation; and an operation command execution unit that performs an operation based on the determination result. 10. A future system state database for accumulating state quantities for a designated period by the load estimating unit and system configuration information at a point in the designated period as a predicted value, and accumulating a judgment result by the voltage control operation judging unit. The power system voltage control device according to claim 9, further comprising: a determination result database that performs the determination. 11. The system according to claim 1, wherein said voltage control operation determining means is a system state predicted value correcting means for performing a correction for providing continuity between said actual value and said predicted value, and operates based on a past system state and a system state at the time of control execution. 10. An operation target equipment determining means for determining a control equipment to be operated, wherein the control target equipment determination means is provided.
0. The power system voltage control device according to 0. 12. The future system state change tendency calculating means for calculating a system state change tendency before the control execution time based on a predicted value corrected by the system state predicted value correction means. 12. The electric power according to claim 11, wherein the operation target equipment determining unit determines the control equipment to be operated in consideration of the system state at the time of the determination and the system state prior to the control execution time. 13. System voltage controller. 13. The voltage control operation determining means, when the future system status database is updated, calculates a scheduled operation time of the control equipment on a control date based on a predicted value in the future system status database. The apparatus further includes a phase adjustment facility operation request signal creating unit that creates an operation request signal corresponding to the scheduled operation time, and the operation target facility determination unit operates based on the operation request signal in consideration of coordination of each control facility. 13. The equipment to be determined is determined.
2. The power system voltage control device according to item 1. 14. A method for predicting a future system state and determining equipment to be operated and operation contents in consideration of a system state at a time of performing control and a system state prior to the predicted time of performing the control. Characteristic power system control method. 15. A state quantity of an electric power system to be controlled is fetched, the fetched state quantity and system configuration information at that time are accumulated as an actual value for a specified period, and a future state quantity is calculated from the accumulated actual value. A control facility to be operated and its operation contents are determined from the actual value and the predicted value of the state quantity, and the operation is performed based on the determination result.