JP7001537B2 - Distribution system voltage regulator Arrangement planning support equipment and methods - Google Patents

Description

The present invention relates to a support device and a method for arranging a voltage regulator connected to a distribution system.

In the distribution system, a voltage regulator is used as a device for compensating for fluctuations in the power consumption (load) of consumers and fluctuations in line voltage due to fluctuations in the generated power of distributed power sources. The automatic voltage regulator SVR (SVR:), which is a voltage regulator that adjusts the tap of the tapped transformer when the integrated value of the voltage at which the secondary voltage of the tapped transformer deviates from the allowable range exceeds the operation set value. A plurality of voltage regulators equipped with a Step Voltage Regulator) and a capacitor or reactor for adjusting the reactive power are arranged. In order to keep the detected voltage within the allowable range in each voltage regulator, the tap position of the tapped transformer is adjusted in the automatic voltage regulator SVR as the adjustment amount by the mechanical mechanism of the voltage regulator, and the reactive power adjustment is performed. The capacitors and reactors for this are adjusting the number of these connected in parallel.

In recent years, the voltage rise of the distribution system has been increasing due to the increase in the reverse power flow of photovoltaic power generation, and it is necessary to avoid the voltage deviation by arranging the voltage regulator, and it is expected that the number of times of planning the arrangement will increase in the future. ..

In the arrangement plan of the voltage regulator, voltage calculation is performed for the combination of the position of the voltage regulator in the distribution system to be searched, the assumed SVR tap position, and the mechanical mechanism adjustment amount which is the number of connections of the parallel capacitor and the parallel reactor. Verify that the voltage is within the proper range. Therefore, a method of searching for a combination by an optimization method has been proposed. For example, in Patent Document 1, particle swarm optimization (PSO) is used to adjust the optimum placement position and mechanical mechanism. It is described that the combination of quantities is searched and the arrangement is obtained by using the voltage calculation by the power flow calculation. The power flow calculation is a calculation method for obtaining the voltage distribution from the distribution substation to the end of the distribution line. The power flow calculation is a method of obtaining the voltage on the distribution system by inputting the transmission voltage, the load, the distributed power generation power, the installation position of the voltage regulator and the adjustment amount of the mechanical mechanism of the distribution substation.

In the layout plan of the voltage regulator, if the number of combinations of the voltage regulator placement position and the assumed mechanical mechanism adjustment amount in the distribution system to be searched is large, the calculation time may become enormous if the power flow calculation is used for the voltage calculation. be. For example, the distribution system operator may want to search more comprehensively for the arrangement position of the voltage adjusting device and the adjustment amount of the mechanical mechanism.

Patent No. 050561888

In Patent Document 1, the arrangement of the voltage adjusting device is planned, but since the voltage calculation needs to be calculated by the power flow calculation, there is a problem that the voltage calculation takes time and the arrangement plan cannot be calculated at high speed.

On the other hand, as a method of reducing the calculation time of the voltage calculation, there is a method of approximating the voltage by referring to the voltage sensitivity which is an estimated value of the voltage fluctuation amount on the distribution system with respect to the mechanical mechanism adjustment amount of the voltage regulator. When the voltage approximation calculation is used for the voltage calculation, the error may become large in the combination in which the mechanical mechanism adjustment amount of the voltage regulator is large.

Therefore, it is an object of the present invention to provide a support device and a method for arranging a voltage adjusting device for a distribution system, which can speed up the calculation while minimizing the deterioration of the voltage calculation accuracy in the voltage calculation.

In order to solve the above problems, the present invention arranges a voltage adjustment device in a support device for a voltage adjustment device arrangement plan of a distribution system including a voltage adjustment device having a mechanical mechanism for voltage adjustment and a naturally fluctuating power supply. An arrangement position selection unit that selects a position on the distribution system, a combination generation unit that generates a combination of mechanical mechanism adjustment amounts of the voltage adjustment device for one or more arranged voltage adjustment devices, and an arrangement position and machine of the voltage adjustment device. In the voltage calculation for the combination of the mechanism adjustment amounts, for the combination of the mechanical mechanism adjustment amounts of the voltage regulators having the same arrangement position, the power flow calculation is performed for the combination of the reference mechanical mechanism adjustment amounts held in advance, and the reference mechanical mechanism is performed. Regarding the combination of the mechanical mechanism adjustment amount different from the adjustment amount, if the change amount of the mechanical mechanism adjustment amount from the standard mechanical mechanism adjustment amount is equal to or more than the threshold value, the combination of the mechanical mechanism adjustment amount is used as the new standard mechanical mechanism adjustment amount. The voltage to obtain the voltage on the distribution system by holding and performing the power flow calculation, and performing the voltage approximation calculation using the voltage sensitivity when the amount of change in the mechanical mechanism adjustment amount from the standard mechanical mechanism adjustment amount is smaller than the threshold value. Based on the voltage margin and the number of voltage regulators, which are the minimum values of the difference between the upper and lower limit voltages allowed for the distribution system and the voltage calculation results for the voltage on the distribution system obtained by the calculation unit and the voltage calculation unit. It is a support device for the voltage adjustment device arrangement plan of the distribution system, which is characterized by having an appropriate arrangement determination unit for determining the position where the voltage adjustment device is arranged.

Further, the present invention selects a position on the distribution system in which the voltage adjustment device is arranged in the support method of the voltage adjustment device arrangement plan of the distribution system including the voltage adjustment device having a mechanical mechanism for voltage adjustment and the naturally fluctuating power supply. Then, for one or more placed voltage regulators, a combination of mechanical mechanism adjustment amounts of the voltage regulators is generated, and in the voltage calculation for the combination of the placement positions of the voltage regulators and the mechanical mechanism adjustment amounts, the voltage with the same placement position is the same. Regarding the combination of the mechanical mechanism adjustment amount of the adjusting device, the power flow calculation is performed for the combination of the standard mechanical mechanism adjustment amount held in advance, and the standard machine for the combination of the mechanical mechanism adjustment amount different from the standard mechanical mechanism adjustment amount. When the amount of change in the amount of mechanical mechanism adjustment from the amount of mechanical adjustment exceeds the threshold value, the combination of the mechanical mechanism adjustment amount is newly held as the standard mechanical mechanism adjustment amount and the power flow calculation is performed, and the standard mechanical mechanism adjustment amount is performed. When the amount of change in the amount of adjustment of the mechanical mechanism from is smaller than the threshold value, the voltage on the distribution system is obtained by performing a voltage approximation calculation using the voltage sensitivity, and the voltage on the distribution system obtained by the voltage calculation is the distribution system. The voltage of the distribution system, characterized in that the position where the voltage regulator is placed is determined based on the voltage margin, which is the minimum value of the difference between the upper and lower limit voltages allowed in the voltage and the number of voltage regulators, and the number of voltage regulators. It is a support method for the adjustment device layout plan. "

According to the present invention, the voltage calculation is performed by combining the power flow calculation and the voltage approximation calculation using the voltage sensitivity, so that the voltage calculation can be speeded up and calculated while minimizing the deterioration of the accuracy of the voltage calculation in the arrangement plan of the voltage regulator. You can save time.

The figure which shows the functional composition example of the support device of the voltage adjustment device arrangement plan of a distribution system. The figure which shows the hardware configuration example when the support device of the voltage adjustment device arrangement plan of a distribution system is configured by a computer, and the whole configuration example of a distribution system. The flowchart which shows the whole processing example in the support device. A flowchart showing a method of obtaining a voltage on a distribution system by either a power flow calculation or a voltage approximation calculation using voltage sensitivity. The figure which shows the concrete concept of the process in FIG. The figure which shows the concrete concept of the process in FIG. The figure explaining the flow of calculation of the proper arrangement position of a voltage regulator. The figure which showed the fluctuation by the load of the voltage Vp2 obtained about the position p2 of a distribution line.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the following, first, the functional configuration of the support device of the voltage adjustment device arrangement plan of the distribution system will be described with reference to FIG. Next, the overall configuration of the support device for the voltage adjustment device arrangement plan of the distribution system according to the present invention and the distribution system 2 will be described with reference to FIG. Next, the processing of the support device of the voltage adjustment device arrangement plan of the distribution system will be described with reference to FIG.

FIG. 1 is a diagram showing a functional configuration example of a support device for a voltage regulator arrangement plan for a distribution system. In FIG. 1, the support device 1 composed of a computer is composed of a display unit 12, an input unit 13, a storage unit 17, a calculation unit (CPU) 15, and a communication unit 14. The support device 1 obtains system configuration data D1, mechanical mechanism adjustment amount change amount threshold data D2, natural power output fluctuation amount data D3, and voltage upper / lower limit data D4 as input data from the input unit 13. , These are appropriately stored in the storage unit 17.

Various data and programs including the input data and the like are stored in the storage unit 17 of FIG. 1, but FIG. 1 illustrates that the voltage sensitivity data D7 is stored.

The calculation unit 15 of FIG. 1 has the functions of the arrangement position selection unit 101, the combination generation unit 102, the voltage calculation unit 103, and the appropriate arrangement determination unit 104, and the appropriate arrangement position data D9 is obtained by the processing of the appropriate arrangement determination unit 104. Generate. The generated information (appropriate arrangement position data D9) is appropriately given to the display unit 12 via the communication unit 14.

More specifically, the processing in each function in the calculation unit 15 will be described. The arrangement position selection unit 101 outputs the arrangement position data D5 using the system configuration data D1. The combination generation unit 102 outputs the arrangement position and the mechanical mechanism adjustment amount combination data D6 by using the arrangement position data D5. In the voltage calculation unit 103, the system configuration data D1, the threshold data D2 of the mechanical mechanism adjustment amount change amount, the natural power supply output fluctuation amount data D3, the arrangement position data D5, and the arrangement position and the mechanical mechanism adjustment amount combination data D6 , The voltage calculation result data D8 is output using the voltage sensitivity data D7. The proper placement determination unit 104 outputs the proper placement position data D9 using the voltage upper / lower limit data D4 and the voltage calculation result data D8. The communication unit 14 displays the appropriate placement position data D9 on the display unit 12.

FIG. 2 is a diagram showing a hardware configuration example and an overall configuration example of the distribution system when the support device 1 of the voltage adjustment device arrangement plan of the distribution system is configured by a computer. Hereinafter, the distribution system will be described first, and then a hardware configuration example of the support device 1 will be described.

First, the distribution system 2 includes a distribution substation 22, a bus 26, a distribution line 23 (23a, 23b, 23c), a load 25, a distributed power source 24 including a naturally fluctuating power source, a voltage adjusting device 21 (21a, 21b, 21c), and the like. It is composed of. A plurality of voltage adjusting devices 21 (21a, 21b, 21c) are installed in series and parallel on the distribution line 23 connected to the distribution substation 22. Further, the support device 1 of the voltage adjustment device arrangement plan of the distribution system acquires data from the voltage adjustment device 21 (21a, 21b, 21c) and the sensor (not shown) on the distribution system via the communication network 3. May be good. As the load 25, a plurality of representative cases are extracted and set. For example, the minimum value and the maximum value can be used as representative cases. The maximum and minimum values of each load can be calculated by extracting the minimum and maximum values from the annual total load data estimated for each distribution line and allocating those total loads by the ratio of the contracted capacity of each load. ..

Here, the support device for the voltage adjustment device arrangement plan of the distribution system is a device that calculates the proper arrangement of equipment such as the voltage adjustment devices 21 (21a, 21b, 21c) installed on the distribution system 2. Specifically, in order to present the arrangement of the voltage adjusting devices 21 (21a, 21b, 21c) on the distribution system, the arrangement of the voltage adjusting devices is displayed on the display screen of the display device 12. The distribution system operator may be entrusted with the setting of the settling parameters and the recalculation of the settling parameters. In this case, the distribution system operator may move to the installation point of each voltage regulator 21 (21a, 21b, 21c) and set it manually, or set it remotely through the communication network 3. You may.

Regarding the voltage regulator 21, in FIG. 2, an example in which an automatic voltage regulator SVR (SVR: Step Voltage Regulator) 21a, 21c, and a tap switching parallel capacitor 21b for adjusting the number of connections of a plurality of parallel capacitors with a tap switcher is adopted. Shows. These may be a load tap changer transformer LRT (LRT: Road Radio Control Transformer). Further, it may be a tap changer shunt reactor that adjusts the number of connections of a plurality of parallel reactors with a tap changer. In the present invention, these are collectively referred to as a voltage regulator 21. In the following description, the case where the voltage regulator 21 on the power supply side of the distribution system is the automatic voltage regulators SVR 21a and 21c and the voltage regulator 21 on the load side of the distribution system is the tap switching parallel capacitor 21b will be described as an example.

The automatic voltage regulators SVR21a and 21c of FIG. 2 are a transformer composed of an autotransformer and a tap changer, a control unit for controlling the tap of the transformer, a sensor, and a voltage regulator arrangement plan for the distribution system. It is composed of a communication unit that transmits and receives setting parameters of the control unit from the support device 1 via the communication network 3. The automatic voltage regulator SVR, which does not have a communication unit, is composed of an input device for the distribution system operator to directly input the setting parameters of the control unit.

As a voltage control method, the automatic voltage regulators SVR21a and 21c use the measured values of the current and voltage measured by the sensor on the secondary side of the transformer, and the voltage at the predetermined position of the distribution line 23 by the line voltage drop compensation circuit (LDC). Estimates the drop, and commands the change of the tap position of the transformer according to the operating time deviating from the dead zone region of the set reference voltage and the amount of deviating voltage. The control unit in the automatic voltage regulators SVR21a and 21c has the settling parameters such as the virtual distribution line impedance value, operating time, dead zone, and reference voltage in the line voltage drop compensation circuit set to appropriate values in advance. The voltage of the distribution system 2 is kept within an appropriate range according to the setting parameter of.

The tap changer parallel capacitor 21b in FIG. 2 is composed of a plurality of parallel capacitors whose number of connections can be changed, a voltage sensor, and a control unit, and determines the voltage of the distribution system according to setting parameters such as operating time, dead zone, and reference voltage. Control. When the time when the voltage at the connection point to the distribution system measured by the voltage sensor deviates from the set reference voltage in the dead zone region exceeds a predetermined operating time, the number of parallel capacitors to be connected is increased or decreased.

The hardware configuration of the support device 1 of the voltage adjustment device arrangement plan of the distribution system of FIG. 2 will be described. The support device 1 for the voltage adjustment device arrangement plan of the distribution system includes a display unit 12, an input unit 13 such as a keyboard and a mouse, a communication unit 14, a calculation unit 15 such as a computer and a computer server (CPU: Central Processing Unit), and a calculation process. A memory 16 such as a RAM for temporarily storing data and the like, and a storage unit 17 are connected by a bus 11.

Of these, the input unit 13 can be configured to include at least one of, for example, a keyboard switch, a pointing device such as a mouse, a touch panel, a voice instruction device, and a non-contact input device by detecting line-of-sight movement and blinking.

The communication unit 14 includes a circuit and a communication protocol for connecting to the communication network 3. The arithmetic unit 15 reads the predetermined computer program data D7 from the storage unit 17 and executes it. The arithmetic unit 15 may be configured as one or a plurality of semiconductor chips, or may be configured as a computer device such as a computer server. The memory 16 is configured as, for example, a RAM (Random Access Memory), stores the program data D7 read from the storage unit 17, and stores the calculation result data required for each process.

The data obtained from the distribution system via the input unit 13 is specifically as follows.

The system configuration data D1 includes information on the voltage regulator 21 (for example, control method, number of taps, impedance, etc.), a network configuration of the distribution line 23, impedances of the distribution line 23 and the transformer, and the like.

The threshold data D2 of the amount of change in the amount of adjustment of the mechanical mechanism is a threshold for switching whether to continue the approximate calculation or to perform the power flow calculation for the combination in the voltage calculation.

The natural power source output fluctuation amount data D3 includes an estimated output fluctuation amount of the distributed power source 24 and the like. The natural power output fluctuation amount data D3 shows the rated capacity of the power generation equipment of the distributed power supply 24, and the apparent power capacity and type (suppression when the voltage rises) of the inverter for interconnection to the distribution system when the distributed power supply 24 is a DC power supply. It may be estimated from the method, etc., the voltage threshold at which autonomous suppression is started when the voltage rises, and the contract regarding suppression (upper limit of suppression days, priority of suppression, etc.).

The voltage upper / lower limit data D4 is an upper limit value and a lower limit value of the voltage that must be satisfied in the distribution system in order to supply electric power to the consumer at an appropriate voltage.

The voltage sensitivity data D4 is predetermined and stored in the storage unit 17.

Next, the calculation processing contents of the support device 1 of the voltage adjustment device arrangement plan of the distribution system will be described with reference to FIG. FIG. 3 is an example of a flowchart showing the entire process of the support device 1 of the voltage regulator arrangement plan of the distribution system.

First, the flow of FIG. 3 will be briefly described. In the first processing step S1 of the support device 1 of FIG. 3, the system configuration data D1, the threshold data D2 of the mechanical mechanism adjustment amount change amount, the natural power supply output fluctuation amount data D3, and the upper and lower voltage limits are passed through the input unit 13. Enter the data D4. The processing step S2 corresponds to the arrangement position selection unit 101 of FIG. 1, and here, the arrangement position data D5 of the voltage adjusting device 21 is calculated using the system configuration data D1. The processing step S3 corresponds to the combination generation unit 102 of FIG. 1, and here, the arrangement position and the mechanical mechanism adjustment amount combination data D6 are calculated using the arrangement position data D5. The processing step S4 corresponds to the voltage calculation unit 103 of FIG. 1, and here, the system configuration data D1, the threshold data D2 of the mechanical mechanism adjustment amount change amount, the natural power supply output fluctuation amount data D3, and the arrangement position. The voltage calculation result data D8 is calculated using the data D5, the arrangement position and mechanical mechanism adjustment amount combination data D6, and the voltage sensitivity data D7. The processing step S5 corresponds to the proper placement determination unit 104 in FIG. 1, and here, the proper placement position data D9 is calculated using the voltage upper / lower limit data D4 and the voltage calculation result data D8. Finally, using the proper placement position data D9 calculated in the processing step S5, the communication unit 14 displays the proper placement of the voltage adjusting device in the distribution system on the display unit 12.

The flow of the above schematic processing will be described in more detail for each processing step.

In the processing step S1, the system configuration data D1, the threshold data D2 of the mechanical mechanism adjustment amount change amount, the natural power supply output fluctuation amount data D3, and the voltage upper / lower limit data D4 are input by using the input unit 13 and the display unit 12. At this time, data may be input through the communication network 3 and the communication unit 14.

In the processing step S2, the arrangement position data D5 of the voltage adjusting device 21 is calculated using the system configuration data D1. For the placement position of the voltage adjusting device 21, a combination of target placement candidate positions is selected. The placement position may be determined from the one whose range is specified in advance by the distribution system operator, or additional, relocation, or removal to the existing system may be considered one by one. In the following description, it is assumed that the automatic voltage regulator SVR 21a and the tap changer parallel capacitor 21b are newly installed at the positions shown in the figure 2 in the distribution system 2 shown in FIG.

In the processing step S3, the arrangement position and the mechanical mechanism adjustment amount combination data D6 are calculated by using the arrangement position data D5 of the voltage adjusting device 21. In this process, a combination of mechanical mechanism adjustment amounts of the voltage regulators arranged in the distribution system is generated. As the combination of the mechanical mechanism adjustment amount, the possible combinations may be comprehensively generated, or the mechanical mechanism adjustment amount of a certain voltage regulator may be fixed. Here, the combination of the mechanical mechanism adjustment amount is, for example, when the automatic voltage regulator SVR21a can be adjusted to 9 stages of tap positions, 9 combinations can be assumed, and 3 tap switching parallel capacitors 21b having different capacities. Considering the input capacity, 7 combinations can be assumed including the case where the capacitor is not input. Further, when it is assumed that both the automatic voltage regulator SVR 21a and the tap changer parallel capacitor 21b are newly installed, 63 combinations can be assumed for both.

In the processing step S4, the system configuration data D1, the threshold data D2 of the mechanical mechanism adjustment amount change amount, the natural power supply output fluctuation amount data D3, the arrangement position data D5, the arrangement position and the mechanical mechanism adjustment amount combination data D6, and so on. The voltage calculation result data D8 is calculated using the voltage sensitivity data D7.

Here, the flow of voltage calculation in the voltage calculation unit 103 will be described with reference to FIG. FIG. 4 shows a method of obtaining a voltage on a distribution system by either a power flow calculation or a voltage approximation calculation using voltage sensitivity through processing steps S41 to S47.

In the processing step S41, a combination of the arrangement position and the mechanical mechanism adjustment amount for which the voltage calculation has not been performed is selected. If the reference mechanical mechanism adjustment amount is not held, the reference mechanical mechanism adjustment amount is selected and held. For example, at first, a tap position called a through tap, which does not adjust the voltage, may be selected as the reference mechanical mechanism adjustment amount. In the processing step S42, if the voltage sensitivity has not been referenced with respect to the arrangement position, the process proceeds to the processing step S43. In the processing step S43, the voltage is calculated by the power flow calculation using the system configuration data D1, the natural power output fluctuation amount data D3, the arrangement position data D5, and the arrangement position and the mechanical mechanism adjustment amount combination data D6, and the power flow calculation is performed. The implemented mechanical mechanism adjustment amount combination is held as a new standard mechanical mechanism adjustment amount, and the process proceeds to process step S44. In the processing step S44, the process proceeds to the processing step S47 with reference to the corresponding voltage sensitivity data D7 based on the voltage calculation result obtained by the power flow calculation and the combination of the arrangement position of the voltage adjusting device and the mechanical mechanism adjustment amount. The voltage sensitivity data D7 may refer to the required amount of data from the database as appropriate, and in order to speed up the calculation, it is necessary to read all the data for the amount expected to be used into the memory 16 first. You may refer to a certain amount of data from the memory 16 as appropriate.

The process returns to the process step S42, and if the voltage sensitivity has already been referred to, the process proceeds to the process step S45. In the processing step S45, when the magnitude of the change in the mechanical mechanism adjustment amount, which is the absolute value of the difference between the selected mechanical mechanism adjustment amount and the reference mechanical mechanism adjustment amount, is equal to or greater than the threshold data D2 of the mechanical mechanism adjustment amount change amount. , Step S43. If the magnitude of the change in the mechanical mechanism adjustment amount is smaller than the threshold data D2 of the mechanical mechanism adjustment amount change in the processing step S45, the process proceeds to the processing step S46.

In the processing step S46, the system configuration data D1, the natural power output fluctuation amount data D3, the arrangement position data D5, the arrangement position and the mechanical mechanism adjustment amount combination data D6, and the voltage sensitivity data D7 are used for voltage approximation calculation. Calculate the voltage. In the voltage approximation calculation, the voltage is calculated by adding the voltage fluctuation amount obtained by the product of the voltage sensitivity and the mechanical mechanism adjustment amount change amount of the voltage regulator to the voltage obtained by the power flow calculation. For example, when the voltage is calculated for the voltage Vi in the node # i of the distribution system, the mechanical mechanism adjustment amount nj of a certain voltage regulator #j arranged on the distribution system, the voltage sensitivity ΔVi / Δnj, and the node calculated by the power flow calculation. It is determined that the equation (1) holds between the voltage Vbi of #i, the mechanical mechanism adjustment amount nbj for which the power flow calculation is performed, and the mechanical mechanism adjustment amount nj for which the voltage is calculated.
[Number 1]
Vi = Vbi + ΣΔVi / Δnj ・ (nj-nbj) (1)
When the voltage approximation calculation is completed, the process proceeds to process step S47.

In the processing step S47, if the voltage calculation is not performed for all the combinations of the arrangement position and the mechanical mechanism adjustment amount, the process returns to the processing step S41. When the voltage calculation is performed for all the combinations of the arrangement position and the mechanical mechanism adjustment amount in the processing step S47, the processing flow is terminated.

Here, a specific concept of the processing in FIG. 4 will be described with reference to FIGS. 5a and 5b. First, FIG. 5a shows each position p (p1, p2, p3, etc.) on the load side of the automatic voltage regulator SVR21a to be newly installed on the horizontal axis, and the combination of mechanical mechanism adjustment amounts (tap position) on the vertical axis side. The voltage for each tp1, p2, tp3) is shown. Depending on the tap position of the automatic voltage regulator SVR21a, the voltage changes like translation.

In the process of FIG. 4, the relationship between the tap position tp, each position p on the load side, and the magnitude of the voltage is to be obtained. At this time, the voltage calculation by the power flow calculation unit requires high-precision half-side time. , In the case of typical conditions, the voltage is calculated by the power flow calculation unit, and in the case of conditions similar to or similar to the case of typical conditions, the voltage approximation calculation unit uses the voltage sensitivity at the load side position p. It is supposed that the voltage is calculated by. Further, in this case, the range of similar or approximate conditions is appropriately evaluated, and the voltage calculation by the power flow calculation and the voltage calculation by the voltage sensitivity are appropriately switched and used. The switching at this time is performed with reference to the threshold data D2 of the amount of change in the amount of adjustment of the mechanical mechanism.

Although FIG. 5b has the same purpose, the influence of the tap switching parallel capacitor 21b is also taken into consideration in addition to the automatic voltage regulator SVR21a, and a total of 63 types of combinations are assumed in the above example. Since the degree of voltage drop or rise on the distribution substation side changes from the tap changer parallel capacitor 21b by turning on the tap changer parallel capacitor 21b, the voltage at each position p on the load side is adjusted by combining the effects of both. Need to estimate.

Returning to FIG. 3, the processing step S5 corresponds to the proper placement determination unit 104 of FIG. 1, and here, the proper placement position data D9 is calculated using the voltage upper / lower limit data D4 and the voltage calculation result data D8. do.

Here, the flow of calculation of the proper arrangement position of the voltage regulator will be described with reference to FIG. FIG. 6 shows a method of arranging the voltage adjusting device using the voltage calculation result through the processing steps S51 to S54.

In the processing step S51, if the voltage margin calculation has not been completed for all the combinations of the arrangement positions and the mechanical mechanism adjustment amounts, the process proceeds to step S52. In step S52, the voltage margin in the combination of the arrangement position for which the voltage margin has not been calculated and the mechanical mechanism adjustment amount is calculated, and the process returns to step S51. When the voltage margin calculation is completed for all the combinations of the arrangement position and the mechanical mechanism adjustment amount in step S51, the process proceeds to step S53. In step S53, the arrangement in which the number of voltage adjusting devices is the smallest among the arrangements in which the voltage margin can be positive is extracted, and the process proceeds to step S54. In step S54, the appropriate arrangement position data D9 having the maximum voltage margin among the arrangements extracted in step S53 is output.

Returning to FIG. 3, in the processing step S6, the proper placement position data D9 is displayed on the display unit 12 by the communication unit 14.

Here, an appropriate threshold value estimation unit may be provided to calculate appropriate threshold value data, and the calculated appropriate threshold value data may be presented to the display unit.

Here, the specific concept of the process in FIG. 6 will be described with reference to FIG. 7. FIG. 7 is a diagram showing fluctuations due to, for example, a difference in the combination of the arrangement position and the adjustment amount of the mechanical mechanism. When a tendency such as Vp2b and Vp2c is shown, it is better to select one showing Vp2b having a high margin with respect to the upper and lower limit voltages, in other words, a voltage close to the center voltage. In this case, for example, the difference between the voltage calculation result and the upper and lower limit voltages can be calculated at the nodes of all distribution systems, and the minimum value of the difference can be used as the voltage margin.

As described above, in the present invention, the voltage is calculated by the power flow calculation for the combination of one or more arrangement positions and the mechanical mechanism adjustment amount, and the magnitude of the mechanical mechanism adjustment amount change is the threshold value based on the combination calculated by the power flow. For smaller combinations, the voltage approximation calculation is performed by adding the voltage fluctuation amount calculated using the referenced voltage sensitivity and the magnitude of the mechanical mechanism adjustment amount change to the voltage obtained by the power flow calculation. Further, in the combination in which the change amount of the mechanical mechanism adjustment amount is equal to or more than the threshold value, both high accuracy and high speed are solved by calculating the voltage using the power flow calculation.

According to the present invention, the power flow calculation and the voltage approximation calculation are selected based on the threshold value of the amount of change in the adjustment amount of the mechanical mechanism to calculate the voltage, thereby speeding up the voltage calculation while minimizing the approximation error and performing the arrangement plan. It can be speeded up.

In the first embodiment, it is premised that the threshold data D2 of the amount of change in the amount of adjustment of the mechanical mechanism is given as input data from the input unit 13. In the second embodiment, a method for specifically setting the threshold data D2 of the amount of change in the amount of adjustment of the mechanical mechanism will be described. When the threshold data D2 of the amount of change in the amount of adjustment of the mechanical mechanism is applied to the support device of the voltage adjustment device arrangement plan of the distribution system, it is in advance based on the voltage accuracy target so that it can be easily used by the distribution system operator of the electric power company. It is agreed to be presented or automatically entered. In the second embodiment, the threshold data D2 of the amount of change in the amount of adjustment of the mechanical mechanism is specifically determined as follows.

First, a threshold value estimation unit is provided. The threshold value estimation unit can be provided as a function in the calculation unit (CPU) 15 of FIG. 1, or is in a format in which the result calculated by a device installed separately from the support device 1 is taken in from the input unit 13. There may be.

The threshold value estimation unit calculates the threshold value data D2 using the error obtained by the system analysis in the representative case and the voltage accuracy target as an operational reference before applying it to the support device of the voltage adjustment device arrangement plan of the distribution system. ..

For example, when multiple nodes of the distribution system where the error is estimated to be the maximum are extracted and the mechanical mechanism adjustment amount of the automatic voltage regulator that sets the threshold value is changed, the error between the power flow calculation and the sensitivity calculation is found at that point. The magnitude of the change in the amount of adjustment of the mechanical mechanism that exceeds the voltage accuracy target is presented as a threshold.

More specifically, for example, in an automatic voltage regulator that sets a threshold value, the node of the distribution system that can maximize the approximation error is extracted. At that node, the minimum value of the mechanical mechanism adjustment amount change amount Δn in the range where the approximation error is equal to or more than the voltage accuracy target ε derived from the voltage width of one tap of the transformer is used as the threshold value Δnth.

Here, the automatic voltage regulator for which the threshold is set is calculated by power flow calculation at the node #i selected from the voltage control range of the automatic voltage regulator in the high-voltage distribution system when the change in the adjustment amount of the mechanical mechanism is Δn. Let ΔVer_i (Δn) be the error data calculated by taking the difference between the voltage and the voltage calculated using the voltage sensitivity. The threshold value Δnth is determined as the minimum value of the mechanical mechanism adjustment amount change amount Δn for which the equation (2) holds between the error data ΔVer_i (Δn) and the voltage accuracy target value ε that determines the threshold value.
[Number 2]
| ΔVer_i (Δn) | / ε ≧ 1 (2)
As the voltage accuracy target ε that determines the threshold value, for example, the following values may be used. For example, a half value of the voltage width nominal value Vnom (150V or the like) for one tap of the pole transformer of the distribution system can be used. In this case, when one tap is 150 V, the voltage accuracy target value ε can be set as ε = Vnom / 2 = 75 (V).

Further, for example, a half value of the voltage nominal value Vsvrnom (100V, 150V, etc.) for one tap of the automatic voltage regulator can be used. In this case, when one tap is 100V, the voltage accuracy target value ε can be set as ε = Vsvrnom / 2 = 50 (V).

Further, for example, a dead band width (voltage conversion value in a high voltage distribution system) with respect to a voltage target value Vref, which is one of the control parameters when the automatic voltage regulator automatically adjusts the voltage, can be used. When a dead zone of 1.5% is taken with respect to the target voltage of 6600V, the voltage accuracy target value ε can be set as ε = 6600V * 0.015 = 99V.

The voltage accuracy target ε is set when a plurality of voltage accuracy targets are set in advance from among the voltage accuracy targets based on the above-mentioned Vnom, Vsvrnom of the automatic voltage regulator, and the dead band width for Vref, and the threshold value is determined. , You may automatically select one appropriate value from them. As an appropriate value selection method, for example, when there are multiple preset voltage accuracy targets, the minimum value among the voltage accuracy target criteria applicable to the configuration of the target distribution system can be selected. can.

According to the second embodiment, by calculating the threshold value, the time required for selecting the threshold value data D2 of the change amount of the mechanical mechanism adjustment amount is reduced, and the calculation can be performed at higher speed.

In addition, the following should be considered in carrying out the examples. For example, when the load side of the automatic voltage regulator is branched into multiple branches and these branched distribution systems are within the voltage management range of the automatic voltage regulator, the point on the branch distribution system where the largest voltage difference occurs is determined in advance. If you check the difference, you can reduce the amount of calculation. It should be taken into consideration that the difference between the power flow calculation and the voltage approximation calculation differs depending on the system configuration.

1: Support device 2: Distribution system 3: Communication network 11: Bus 12: Display unit 13: Input unit 14: Communication unit 15: CPU
16: Memory 17: Storage unit 21: Voltage regulator 21a, 21c: Automatic voltage regulator SVR
21b: Tap changer parallel capacitor 22: Distribution substation 23: Distribution line 24: Distributed power source 25: Load 26: Bus 101: Arrangement position selection unit 102: Combination generation unit 103: Voltage calculation unit 104: Appropriate arrangement determination unit

Claims (13)

In the support device of the voltage adjustment device arrangement plan of the distribution system equipped with the voltage adjustment device having a mechanical mechanism for voltage adjustment and the naturally fluctuating power supply.
An arrangement position selection unit that selects a position on the distribution system in which the voltage adjustment device is arranged, a combination generation unit that generates a combination of mechanical mechanism adjustment amounts of the voltage adjustment device for one or more arranged voltage adjustment devices, and a voltage adjustment unit. In the voltage calculation for the combination of the arrangement position of the device and the adjustment amount of the mechanical mechanism, for the combination of the adjustment amount of the mechanical mechanism of the voltage adjustment device having the same arrangement position, the tidal current calculation is performed with the combination of the adjustment amount of the reference mechanical mechanism held in advance. However, regarding the combination of the mechanical mechanism adjustment amount different from the standard mechanical mechanism adjustment amount, if the change amount of the mechanical mechanism adjustment amount from the standard mechanical mechanism adjustment amount is equal to or more than the threshold value, the combination of the mechanical mechanism adjustment amount is used as a new standard. If the amount of change in the amount of mechanical mechanism adjustment from the standard amount of mechanical mechanism adjustment is smaller than the threshold value, the power distribution system is calculated by performing voltage approximation calculation using voltage sensitivity. Voltage margin and voltage which are the minimum values of the difference between the upper and lower limit voltage allowed for the distribution system and the voltage calculation result for the voltage on the distribution system obtained by the voltage calculation unit and the voltage calculation unit for obtaining the above voltage. A support device for a voltage regulator placement plan of a distribution system, which comprises an appropriate placement determination unit that determines a position for arranging voltage regulators based on the number of regulators. In the support device of the voltage adjustment device arrangement plan of the distribution system according to claim 1.
The voltage approximation calculation is a support device for a voltage regulator arrangement plan of a distribution system, which is characterized in that a voltage is calculated by adding a voltage fluctuation amount calculated by using a change amount of a voltage sensitivity and a mechanical mechanism adjustment amount. In the support device for the voltage adjustment device arrangement plan of the distribution system according to any one of claims 1 to 2.
The voltage regulator having a mechanical mechanism includes a transformer with a tap, and the number of combinations of the mechanical mechanism adjustment amounts of the voltage regulator is the number of taps. .. In the support device for the voltage adjustment device arrangement plan of the distribution system according to any one of claims 1 to 3.
A voltage regulator having a mechanical mechanism includes a plurality of capacitors, a reactor and a switch, and the number of combinations of the mechanical mechanism adjustment amount of the voltage regulator is the number of combined capacities determined by the combination of the capacitor and the reactor. A support device for the voltage adjustment device layout plan of the distribution system. In the support device for the voltage adjustment device arrangement plan of the distribution system according to any one of claims 1 to 4.
The appropriate arrangement determination unit selects an arrangement position in which the number of voltage adjusting devices is the smallest among the arrangements in which the voltage margin is a positive value for the voltage on the distribution system obtained by the voltage calculation unit. A support device for the voltage adjustment device layout plan of the distribution system, which is a feature. In the support device of the voltage adjustment device arrangement plan of the distribution system according to claim 5.
The appropriate arrangement determination unit is a support device for a voltage adjustment device arrangement plan of a distribution system, characterized in that the number of the voltage adjustment devices is the minimum and the arrangement position where the voltage margin is the maximum is selected. In the support device of the voltage adjustment device arrangement plan of the distribution system according to claim 1.
The threshold value for the change amount of the mechanical mechanism adjustment amount of the voltage regulator is an error between the power flow calculation and the voltage approximation calculation at that point when the mechanical mechanism adjustment amount of the automatic voltage regulator that sets the threshold value is changed. However, it is a support device for the voltage adjustment device arrangement plan of the distribution system, which is characterized in that the amount of change in the adjustment amount of the mechanical mechanism that exceeds the voltage accuracy target is used as a threshold. In the support device of the voltage adjustment device arrangement plan of the distribution system according to claim 7.
The voltage regulator having a mechanical mechanism includes a transformer with a tap, and is characterized in that the voltage accuracy target is set as a half value of the voltage width nominal value for one tap of the transformer with a tap. Support device for device layout planning. In the support device of the voltage adjustment device arrangement plan of the distribution system according to claim 7.
The voltage regulator having a mechanical mechanism is an automatic voltage regulator, and the voltage accuracy target is set as the value of the dead band width with respect to the voltage target value which is one of the control parameters when the automatic voltage regulator automatically adjusts the voltage. A support device for the voltage regulator layout plan of the distribution system, which is characterized by being determined. In the support device of the voltage adjustment device arrangement plan of the distribution system according to claim 7.
The voltage regulator having a mechanical mechanism is an automatic voltage regulator, and the voltage regulator of the distribution system is characterized in that the voltage accuracy target is set as a half value of the voltage width nominal value for one tap of the automatic voltage regulator. Deployment planning support device. In the support method of the voltage adjustment device arrangement plan of the distribution system equipped with the voltage adjustment device having a mechanical mechanism for voltage adjustment and the naturally fluctuating power supply.
Select the position on the distribution system where the voltage regulator is placed, generate a combination of the mechanical mechanism adjustment amount of the voltage regulator for one or more placed voltage regulators, and place the voltage regulator and the mechanical mechanism adjustment amount. In the voltage calculation for the combination of, for the combination of the mechanical mechanism adjustment amount of the voltage regulator with the same arrangement position, the power flow calculation is performed with the combination of the standard mechanical mechanism adjustment amount held in advance, and the standard mechanical mechanism adjustment amount is used. For combinations of different mechanical mechanism adjustment amounts, if the change in mechanical mechanism adjustment amount from the standard mechanical mechanism adjustment amount is greater than or equal to the threshold value, the combination of mechanical mechanism adjustment amounts is retained as the new standard mechanical mechanism adjustment amount. When the power flow calculation is performed and the change amount of the mechanical mechanism adjustment amount from the reference mechanical mechanism adjustment amount is smaller than the threshold value, the voltage on the distribution system is obtained by performing the voltage approximation calculation using the voltage sensitivity, and the voltage calculation is performed. Regarding the voltage on the distribution system obtained in step 2, the position where the voltage adjustment device is placed based on the voltage margin, which is the minimum value of the difference between the upper and lower limit voltage allowed for the distribution system and the voltage calculation result, and the number of voltage adjustment devices. A method of supporting the arrangement plan of the voltage regulator of the distribution system, which is characterized by determining. In the support method of the voltage regulator arrangement plan of the distribution system according to claim 11.
Regarding the voltage on the distribution system obtained by the voltage calculation method, voltage adjustment is made out of the arrangement in which the voltage margin, which is the minimum value of the difference between the upper and lower limit voltages allowed for the distribution system and the voltage calculation result, is a positive value. A method of supporting a voltage regulator placement plan for a distribution system, which comprises selecting a placement position that minimizes the number of devices. In the support method of the voltage regulator arrangement plan of the distribution system according to claim 12.
A method for supporting a voltage adjusting device arrangement plan for a distribution system, which comprises selecting an arrangement position in which the number of the voltage adjusting devices is the minimum and the voltage margin is the maximum.

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