JP4890920B2 - Power quality maintenance support method and power quality maintenance support system for a distribution system in which a plurality of distributed power sources are connected - Google Patents

Power quality maintenance support method and power quality maintenance support system for a distribution system in which a plurality of distributed power sources are connected Download PDF

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JP4890920B2
JP4890920B2 JP2006111852A JP2006111852A JP4890920B2 JP 4890920 B2 JP4890920 B2 JP 4890920B2 JP 2006111852 A JP2006111852 A JP 2006111852A JP 2006111852 A JP2006111852 A JP 2006111852A JP 4890920 B2 JP4890920 B2 JP 4890920B2
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distributed power
distribution
voltage
distribution system
power
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JP2007288877A (en
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倫行 内山
康則 大野
明彦 渡辺
雅浩 渡辺
真一 近藤
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株式会社日立製作所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of electrical power generation, transmission or distribution, i.e. smart grids as climate change mitigation technology in the energy generation sector
    • Y02E40/72Systems characterised by the monitoring, control or operation of energy generation units, e.g. distributed generation [DER] or load-side generation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/10Systems characterised by the monitored, controlled or operated power network elements or equipment
    • Y04S10/12Systems characterised by the monitored, controlled or operated power network elements or equipment the elements or equipment being or involving energy generation units, including distributed generation [DER] or load-side generation
    • Y04S10/123Systems characterised by the monitored, controlled or operated power network elements or equipment the elements or equipment being or involving energy generation units, including distributed generation [DER] or load-side generation the energy generation units being or involving renewable energy sources

Description

  The present invention relates to a power quality maintenance support method and a power quality maintenance support system for a distribution system in which a plurality of distributed power sources are interconnected.

  In recent years, the environment surrounding power systems has been changing rapidly, such as the progress of electric power liberalization, structural changes in the energy industry, and the spread of information technology (IT), which is a network technology, and distributed power sources. As for electricity liberalization, deregulation represented by “expanding the range of retail” is progressing, retailing to large consumers was liberalized in March 2000, and to high-voltage electricity consumers in 2005 The application has been expanded, and full-scale liberalization is planned around 2007 for low-voltage power consumers such as ordinary households.

  With this electricity liberalization, an increase in new retailers such as PPS (Power Producer and Supplier) is expected. In particular, with regard to the spread of distributed power sources, as a national policy, the installed capacity of power sources using new energy such as solar power, wind power, biomass and fuel cells will be increased from 2.78 million kW as of 2000 to 19.16 million kW in 2010. The goal is to increase significantly.

  In order to realize the above target, for example, RPS system (Renewable Portfolio Standard: special measures related to energy use by electric power companies) obliged to supply 1.35% of the total power demand by power using new energy by 2010 Legislation) is also being developed.

  By the way, when the introduction of distributed power sources progresses as described above, and many distributed power sources are connected to the power system, voltage rises due to reverse power flow, voltage / frequency fluctuations due to output fluctuations, or power flow congestion in distribution lines There is concern that the decline in power quality and supply reliability will become apparent.

  In particular, maintaining a proper voltage is an important issue in the distribution system. For example, when the number of distributed power sources connected to the distribution system increases, the apparent load decreases, and a situation occurs in which the current sent from the distribution substation decreases and the voltage deviates from the upper limit value. There seems to be a problem.

  Japanese Patent Application Laid-Open No. 2004-56996 discloses a power information management system that performs power distribution while coordinating between a power distribution system and a distributed power supply in the power distribution system. Collects information on the amount of power generated and the power consumption of consumers, compares the supply capacity and power shortage between the distributed power sources in the distribution system, and applies for an increase in output for the distributed power source. It is determined whether or not it can be supported by a voltage regulator installed in the system.

  And if it can respond, the distribution system control technique for controlling the congestion of the power flow in the distribution system by issuing a corresponding instruction to the voltage regulator of the distribution system and an instruction to increase the output to the distributed power supply is disclosed.

  Japanese Patent Laid-Open No. 2004-274812 collects operation data of a distributed power source of a customer linked to a distribution system and the system state of the distribution system, and the power quality installed in the distributed power source and the distribution system. The maintenance device is coordinated to transmit and control the output command of the distributed power source to the customer and the control command of the quality maintenance device to the manager of the distribution system.

  In addition to controlling the equipment on the power distribution system side, the output control of the distributed power supply of the customer is also used to measure and evaluate the contribution of the distributed power supply to the maintenance of power quality. Disclosed is a distribution system control technology that compensates for unfairness among consumers.

JP 2004-56996 A JP 2004-274812 A

  However, according to the technique described in Japanese Patent Application Laid-Open No. 2004-56996 of Patent Document 1, an application for an increase in output to a distributed power supply is made after waiting for a certain period of time if there is any problem in voltage or power flow in the distribution system. Judgment of necessity is made.

  If the above situation is not improved even after a lapse of a certain time, the increase in output with respect to the distributed power supply is forgotten, and means for improving the power quality is performed only by the voltage regulator installed in the distribution system.

  Therefore, depending on the system conditions such as the delay in responding to the load state of the distribution system that changes every moment in the normal operation state, the load, the distribution of distributed power sources, etc. There is a problem that output requests and output restrictions may be biased in the type power supply.

  Moreover, in the technique described in Japanese Patent Application Laid-Open No. 2004-274812 of Patent Document 2, not only the equipment on the distribution system side but also the output control of the distributed power source of the consumer is actively utilized. It only measures and evaluates the contribution of distributed power sources to the maintenance of power quality and compensates for this with electricity charges.

  Therefore, the problem that the output request and the output restriction are biased in a specific distributed power source in order to maintain the appropriate voltage of the power distribution system according to the system conditions such as the load in the power distribution system and the distribution of the distributed power source cannot be solved.

  An object of the present invention is to maintain a proper power quality in a distribution system in which a plurality of distributed power sources are interconnected, and to adjust the output to a plurality of distributed power sources in order to eliminate voltage fluctuations in the distribution system. An object of the present invention is to provide a power quality maintenance support method and a power quality maintenance support system for a distribution system in which a plurality of distributed power sources are interconnected, in which the occurrence of variations among power sources is suppressed.

The power quality maintenance support method for a distribution system in which a plurality of distributed power sources are connected to each other according to the present invention collects state data of a distribution system in which a plurality of distributed power sources are linked and operation data of these distributed power sources. Search for voltage deviation points where the distribution line of the distribution system deviates from the specified voltage range, and if there is a voltage deviation point, power factor or invalidity as a control value for multiple distributed power sources linked to the distribution system Calculates the power output and calculates the power flow status and voltage distribution of the distribution system when operating multiple distributed power supplies based on the calculated control value, and controls based on the calculated power flow status and voltage distribution Power quality maintenance support method for a distribution system in which multiple distributed power sources are connected to operate the distributed power source by calculating the control command value for the target distributed power source and maintain the voltage of the distribution system within an appropriate range In The control values for a plurality of distributed power sources that are linked to the power distribution system when there is圧逸de point when each operation, so that the control value of the output adjustment to the distributed power supply within a desired range, distributed power sources The control value that is output with respect to is configured to set the constraint condition with reference to the stored control history and calculate the control value, and to collect the state data of the collected power system and the operation data of the distributed power source the voltage deviation point the distribution using the estimated value estimated voltage of the distribution system is searched from the control value, characterized in Rukoto stored as a new control history.

Also, the power quality maintenance support system for a distribution system in which a plurality of distributed power sources are connected according to the present invention is installed in a power distribution system in which a plurality of distributed power sources are linked and a plurality of distributed power sources, respectively. A detector for collecting the state data and the operation data of a plurality of distributed power sources, and a voltage deviation point search calculator for a distribution line that searches for a voltage deviation point where the distribution line of the distribution system deviates from a predetermined voltage range A control value calculator for a distributed power source that calculates a power factor or reactive power output as a control value for a plurality of distributed power sources linked to the distribution system when there is a voltage deviation point, and a control value calculated Distribution system power flow calculation and voltage distribution calculator for calculating power distribution status and voltage distribution when multiple distributed power sources are operated, and the control pair based on the calculated power flow status and voltage distribution Of a distribution system in which a plurality of distributed power sources are connected to each other, including a monitoring control server having a control command value calculator for a distributed power source that calculates a control command value for the distributed power source to be operated. In the power quality maintenance support system, when there is a voltage deviation point, the control value output to the distributed power source is such that the control value for the plurality of distributed power sources linked to the distribution system falls within a desired range. A constraint condition calculator for calculating a constraint condition with reference to the stored control history, and collecting power system state data and distributed power source operation data collected by the detectors via the communication system. A distribution system state estimation calculator for estimating a voltage distribution state of the distribution system to which the distributed power supply is linked, and the voltage deviation portion is estimated by the state estimation calculator Is searched from the control value is characterized by being configured to so that is stored as a new control history.

  According to the present invention, by controlling a plurality of distributed power sources in cooperation with each other, it is possible to maintain proper power quality in a power distribution system in which a plurality of distributed power sources are interconnected, and to change voltage of the power distribution system. Power quality maintenance support method and power quality maintenance support system for a distribution system in which a plurality of distributed power sources are connected, in which output adjustment to a plurality of distributed power sources to eliminate the problem is suppressed Can be realized.

  Next, a power quality maintenance support system for a distribution system having a plurality of distributed power sources in the system according to an embodiment of the present invention will be described with reference to the drawings.

  A schematic configuration of a power distribution system having a plurality of distributed power sources in the system according to an embodiment of the present invention and a power quality maintenance support system of the power distribution system will be described with reference to FIG.

  In FIG. 1, a single-wire connection of a distribution system 2 having a plurality of distributed power sources 81 to 84 and a configuration of a power quality maintenance support system 1 including a monitoring control server 100 that performs power quality maintenance support of the distribution system 2 are provided. It is shown.

  The configuration of the distribution system 2 includes a plurality of distribution lines 41 that are connected to the distribution transformer 5 connected to the upper distribution system via the bus 4 and supplied with power. The circuit breaker 6 is installed on the upstream side of the lines of the distribution lines 41, and the voltage sensor 31 and the current sensor 32 are installed in the lines of the distribution line 41 on the downstream side of the circuit breaker 6, respectively. ing. As these voltage sensor 31 and current sensor 32, a switch with a voltage or current sensor may be used.

  Further, the distribution line 41 has a plurality of, for example, four types of distributed power sources 81 to 84 including a power source using natural energy such as solar power generation or wind power generation that generates electric power, or a power source using a gas engine. They are connected to each other.

  In this case, among the distributed power sources 81 to 84, the distributed power source 81 and the distributed power source 82 are linked to a high-voltage distribution line, for example, the distribution line 41. The distributed power source 83 and the distributed power source 84 are For example, it is further configured to be connected to a low-voltage distribution line 41a that is set to a low voltage via a transformer 7.

  In general, the distributed power sources 81 to 84 are generally owned by a consumer together with a load that consumes power, but the load is not shown here for the sake of simplicity.

  In FIG. 1, only the distribution line 41 is shown as the distribution line, but actually, a plurality of distribution lines are connected to the bus 4, and a plurality of distributed power sources other than the distribution line 41 have a plurality of distributed power sources. It constitutes an integrated distribution system.

  In order to transmit the power generation output of the distributed power sources 81 to 84 and the measurement data of the voltage and current of the power flowing through the distribution line 41 to the power quality maintenance support system 1 via the communication line 9, the distributed power sources 81 to 84 are used. Are provided with communication control devices 23 to 26, respectively, and the power generation output data generated by the distributed power sources 81 to 84 by the communication control devices 23 to 26 is transmitted to the power quality maintenance support system 1.

  Similarly, the communication control devices 21 and 22 are also installed in the voltage sensor 31 and the current sensor 32 installed in the distribution line 41, and the voltage of the power flowing through the distribution line 41 detected by these communication control devices 21 and 22. And current measurement data are transmitted to the power quality maintenance support system 1 respectively.

  Further, the power quality maintenance support system 1 can transmit the control commands for individually controlling the operation status to each of the distributed power sources 81 to 84 via the communication line 9. The communication control devices 23 to 26 are respectively input.

  The power quality maintenance support system 1 mainly maintains and manages power quality in the distribution system 2, detection information on the power of the distributed power sources 81 to 84 linked to the distribution system 2, and these distributed types. Operation control commands for the power supplies 81 to 84 and detection information measured by the voltage sensor 31 and the current sensor 32 installed on the distribution line 41 of the distribution system 2 are exchanged.

  The power quality maintenance support system 1 exchanges various information between the voltage sensor 31 and the current sensor 32 and the distributed power sources 81 to 84 installed on the distribution line 41 of the distribution system 2 via the communication line 9. .

For this reason, the communication control devices 21 and 22 provided in the voltage sensor 31 and the current sensor 32 and the communication control devices 23 to 26 provided in the distributed power sources 81 to 84 respectively receive various information, A monitoring control server 100 that performs arithmetic processing for quality maintenance support, storage devices 14 and 15 for storing measurement data and calculation results necessary for arithmetic processing in the monitoring control server 100, and monitoring The display device 12 displays a control result and an input device 13 for an operator to operate.

  The storage device 14 is a database for storing online data such as measurement data, and the storage device 15 is for distribution system conditions (system configuration, line constants, taps on pole transformers, etc.), and distributed power supply characteristic information. And a database for storing offline data such as control history.

  100, the distribution system 2 and the distributed power source measured by the distributed power sources 81 to 84 having the distributed power source and the communication control devices 21 to 26 installed in the voltage / current sensors 31 and 32 of the distribution system. Based on the data of 81-84, voltage distribution, power flow distribution, etc. are monitored. When the voltage management value deviates, the control value of the distributed power source is calculated.

  Next, FIG. 2 shows a flowchart of calculation processing performed by the monitoring control server 100 of the power quality maintenance support system 1 shown in FIG. Hereinafter, the relationship between the processing contents in steps S1 to S8 in the arithmetic processing flow shown in FIG. 2 and the arithmetic devices constituting the monitoring control server 100 shown in FIG. 5 will be described. These processes of steps S1 to S8 are automatically repeated at a predetermined time interval (for example, about several minutes).

Distribution system monitoring information collection step S1:
Monitoring information of voltage and current at a predetermined position of the distribution line 41 is collected as state data of the distribution system 2. This is because voltage and current detection data of the distribution line 41 of the distribution system 2 measured by the voltage sensor 31 and the current sensor 32 installed on the distribution line 41 of the distribution system 2 are connected to the voltage sensor 31 and the current sensor 32. Then, the data is transmitted from the communication control devices 21 and 22 via the communication line 9 and stored in the database 14 after being accommodated in the monitoring information collector 101 constituting the monitoring control server 100 shown in FIG.

Step S2 for collecting distributed power source monitoring information:
Similarly, as the monitoring information of the distributed power sources 81 to 84, the power generation outputs of the distributed power sources 81 to 84 from the communication control devices 21 to 26 connected to the distributed power sources 81 to 84 via the communication line 9, respectively. Measurement data such as power factor is collected and stored in the database 14 after being accommodated in the monitoring information collector 101 constituting the monitoring control server 100 shown in FIG.

  The power generation outputs and power factors of the distributed power sources 81 to 84 are displayed on output / power factor indicators provided in operation control devices (not shown) installed in the respective distributed power sources 81 to 84. The power generation output and power factor of 84 are measured, and this measurement data is collected and stored for a predetermined period.

Step S3 of power distribution system state estimation:
In the process of step S3, the state quantity of the distribution system 2 and the power generation output data of the distributed power sources 81 to 84 collected in the respective processes of step S1 of the distribution system monitoring information collection and step S2 of the distributed power supply monitoring information collection. Based on the above, the voltage distribution of the distribution lines 41 of the distribution system 2 is detected or estimated by the state estimation calculator 102 of the distribution system constituting the monitoring control server 100 shown in FIG.

  Preferably, the distribution system state estimation calculator 102 detects or estimates both the voltage distribution and the current distribution of the distribution line 41 of the distribution system 2 by calculation.

  In step S3 of this distribution system state estimation, at the point of the distribution line 41 where there is measurement data measured by the voltage sensor 31 and the current sensor 32 by the distribution system state estimation computing unit 102, these measurement data are used to determine the distribution system state. The state quantity is detected, and the state quantity is estimated from the estimation calculation at other points of the distribution line 41 without the measurement data.

  Then, in step S3 of this distribution system state estimation, as shown in FIG. 2, the distribution system voltage, current measurement data 141, distributed power source output, power factor measurement data 142, and distribution system condition data (configuration , Line constants, taps) 151 are transmitted.

  In the present embodiment, the method and means for estimating the state of the distribution system are not particularly limited. For example, as described in column 7, paragraph number 0024 to column 9, paragraph number 0034 of JP-A-2003-79071. In addition, the currents in all the sections of the distribution line are estimated using the measured values of the delivery current of the distribution lines and the estimated values of the load characteristics of the consumers in each section of the distribution lines. That is, the current measurement value and current estimation value in the section where measurement data is acquired are compared, the deviation is distributed to all sections of the distribution line, the current estimation value is corrected, and the current estimation value and line impedance in each section are corrected. A method of estimating the state of the distribution system by estimating the voltage of each part based on the above can be applied.

Step S4 for searching for a voltage deviation point:
In the process of step S4, based on the status of the voltage distribution and current distribution, which are the state data of the distribution system 2 estimated in step S3 of the distribution system state estimation, the voltage deviation point search computing unit 103 of the distribution line shown in FIG. Thus, a part where the voltage deviates from a predetermined value in the distribution line 41 is searched.

  The standard for judging voltage deviation is appropriate when the voltage of the distribution system is converted to the low voltage side and the voltage converted to the low voltage side is out of the range of 101 ± 6V stipulated in Article 44 of the Electrical Machinery Business Law Enforcement Regulations. This is a voltage deviation.

  Further, when converting to the high voltage side, it changes slightly depending on the setting of the transformation ratio of the pole transformer, but if it is out of the range of 6600 ± 392V, it is determined that the deviation is an appropriate voltage.

Step S5 for determining whether or not there is a voltage deviation point:
In the process of step S5, the presence / absence of a voltage deviation point in each distribution line 41 is determined from the processing result in step S4 of the voltage deviation point search. Then, when there is no voltage deviation point in each distribution line 41, processing at the next time step is performed, and when there is a voltage deviation point, processing from step S6 to step S8 described below is performed.

Step S6 for determining the distributed power source to be controlled and the control value:
In the process of step S6, the distributed power source to be controlled and the control value are determined. In this step S6, in order to set the voltage at each point in the distribution line 41 within the appropriate range, And the power factor or reactive power output, which is a control value thereof, is automatically determined using optimization calculation.

  Further, as shown in FIG. 2, various data of the distributed power supply characteristic data (rating, sensitivity coefficient, control history) 152 are transmitted to the step S6 for determining the distributed power supply to be controlled and the control value. It is configured as follows.

  Step S6 for determining the distributed power source to be controlled and the control value is composed of steps 61 to 65 described below. Next, details of the processing of step 61 to step 65 will be specifically described with reference to FIG.

Step S61 for setting the target function:
In the process of step S61, an objective function is set based on the distribution system state estimation result 153 in step S3 of the distribution system state estimation.

  That is, in step S61 for setting the target function, calculation is performed by the optimal calculator 105 for the control value for the distributed power source shown in FIG. Incorporate the objective function shown in. As the objective function, for example, the following functional expression (1) is used so as to minimize the sum of the voltage deviation amounts at each point in the distribution line 41 and the sum of the control amounts of the distributed power sources 81 to 84. Is defined and processed.

... (1)
here,
κ∈: Node with distributed power source that can control reactive power
i∈: node ΔV i where the target value of voltage control is present: initial deviation β Vij with respect to the target value of voltage control of the node: sensitivity coefficient (voltage change amount of node with respect to change of reactive power of node)
ΔLq κ : Node reactive power control amount (variable)
y Vi : Voltage control deviation Av, B κ : Coefficient V i : Measurement value Sensitivity coefficient β Vij is the distribution line 41 with the distributed power sources 81 to 84 when the power generation output of each of the distributed power sources 81 to 84 is changed. Is an index representing how much the voltage at each point changes, and is evaluated in advance by power flow calculation and stored in the database 15. Specifically, the reactive power of the distributed power sources 81 to 84 may be changed by a minute amount and evaluated by the voltage change amount at that time.

Restriction condition setting step S62:
In the process of step S61, the constraint condition for optimization calculation is set by the constraint condition calculator 104 shown in FIG. That is, the control amount for each of the distributed power sources 81 to 84 has upper and lower limit values determined by the minimum power factor defined by the facility capacity of the distributed power sources 81 to 84 and the interconnection conditions. In addition, in order to share fairly among a plurality of distributed power sources, the control amount for a specific distributed power source among the distributed power sources 81 to 84 does not become larger than the control amount of other distributed power sources. Adjustment is made so that the control amount falls within a desired range from the viewpoint of suppressing the occurrence of variations in output adjustment between the mold power sources.

Therefore, the functions expressed by the following equations (2) and (3) are incorporated in the constraint condition calculator 104, respectively. The upper and lower limit constraints of the control amount ΔLq i are defined by these equations (2) and (3).

                                ... (2)

... (3)
Here, Lq j is a reactive power value at the current time of each distributed power source, and x qUj and x qLj are coefficients of control values.

From the viewpoint of controlling the output adjustment for the plurality of distributed power supplies 81 to 84 to suppress the variation among the distributed power supplies, the coefficient is adjusted so that the control amount of the output adjustment for each of the distributed power supplies 81 to 84 falls within a desired range. The values of x qUj and x qLj are adjusted.

  For example, referring to the control history of the database 15 (the number of control operations, the control amount integrated value, etc.), the control value coefficient for a specific distributed power supply is intentionally changed to arbitrarily set the control range of the corresponding distributed power supply. Adjust the coefficients so that they can be changed to values.

Step S63 of calculating the control amount ΔQ of each distributed power source by the optimization calculation:
In the processing of step S63, the objective function of Expression (1) and the function expressions of Expression (2) and Expression (3) are performed by the optimal calculator 105 and the constraint condition calculator 104 of the control value for the distributed power source shown in FIG. The optimum control value ΔQ for each of the distributed power sources 81 to 84 is calculated using the constraint condition.

  In the calculation of the control value ΔQ for each of the distributed power sources 81 to 84, for example, a quadratic programming method can be used. However, other optimal calculation methods may be used.

Step S64 of calculating the voltage distribution by power flow calculation:
In the process of step S64, when the distributed power sources 81 to 84 are operated using the optimum control value obtained by the optimization calculation of step S63 for calculating the control amount ΔQ of each distributed power source by the optimization calculation. In order to calculate the power flow and voltage distribution of the power distribution system in FIG. 5, the power flow calculation of the power distribution system 41 and the power distribution calculator 106 shown in FIG. calculate.

Step S65 for determining the voltage distribution status:
In the process of step S65, it is determined whether or not the voltage distribution of the distribution line 41 calculated in step S64 of the voltage distribution calculation by the power flow calculation is distributed within an appropriate range.

If the voltage distribution does not fall within an appropriate range, the distributed equation is used for output adjustment for a plurality of distributed power sources, which are the constraint conditions of the function equation (2) and the function equation (3) incorporated in the constraint condition calculator 104. The coefficients x qUj and x qLj relating to the suppression of the occurrence of variation between the power sources are reset so as to relax the upper and lower limit constraints, and the processes of step S62 and step S63 are performed again to optimize the distributed power sources 81 to 84. The control value is calculated, and then the voltage distribution of the distribution line 41 is calculated again in step S64.

  Then, the calculation is repeatedly performed until it is confirmed that the voltage distribution of the distribution line 41 calculated in step S64 of the voltage distribution calculation by the power flow calculation is distributed within an appropriate range.

  As described above, the optimum control values for the respective distributed power sources 81 to 84 determined by the processing described with reference to FIG. 3 are thereafter processed according to the following procedure shown in Step 7 and Step 8 of FIG.

Step S7 of control command output:
In the process of step S7, the optimum control command value determined in the process of step S6 is determined for the distributed power sources 81 to 84 of the consumer linked to the distribution line 41 of the distribution system 2 to be controlled, as shown in FIG. Is transmitted via the communication line 9 and the communication control devices 23 to 26 by the control command calculator 107 for the distributed power source shown in FIG.

Step S8 for storing the control value in the database:
In the process of step S8, the optimal control command value output to the customer's distributed power sources 81 to 84 by the control command calculator 107 for the distributed power source shown in FIG. 5 is stored in the database 15 as a control history.

  The monitoring control server 100 in the power quality maintenance support system 1 of the above-described embodiment performs the processes in steps S1 to S8, thereby maintaining a plurality of distributed power sources linked to the distribution system while maintaining proper power quality. A fair interconnected operation is achieved.

  FIG. 4 shows the state of control operation of the distribution system in the voltage maintenance support system of the distribution system in which a plurality of distributed power sources, which are one embodiment of the present invention shown in FIGS. 1 to 3, are connected. is there.

  (A) of FIG. 4 represents the voltage distribution state of the distribution line 41 at an arbitrary position from the start end to the end of the distribution line 41 of the distribution system in which a plurality of distributed power sources 81 to 84 are linked. The distribution of the converted voltage is shown.

  FIG. 4B shows the power factor of the distributed power sources 81 to 84 connected to the distribution line 41. The power factor distribution at each position from the start end to the end of the distribution line 41 of the distribution system is shown. It is shown. In the figure, the one-point difference line is the lower limit value of the power factor determined by the system linkage guidelines for the distribution system.

  FIG. 4C shows the state of distribution of active power that is the power generation output of the distributed power sources 81 to 84 at each position from the start end to the end of the distribution line 41 of the distribution system.

  In (a) to (c) of FIG. 4, the solid line indicates the state of the distribution system when the control of the present invention is applied, and the distribution system is controlled by the control of the voltage maintenance support system of the embodiment of the present invention. The voltage distribution situation of the distribution line at the time of instruct | indicating the optimal control value to each of the some distributed power supply 81-84 linked is shown.

  The broken lines indicate power distribution when the plurality of distributed power sources 81 to 84 are individually operated without being linked to each other by the operation control device included in each of the distributed power sources 81 to 84 without applying the control of the present invention. The voltage distribution status of the system is shown for reference.

  The upper limit value and the lower limit value in the voltage of the distribution system shown in (a) of FIG. 4 are values defined in Article 44 of the Electrical Machinery Business Law Enforcement Regulations, which are the criteria for determining voltage deviation, and the voltage of the distribution system is When converted to 6600V on the high voltage side, the upper limit value is 6600 + 392V and the lower limit value is 6600-392V, and this range of 6600 ± 392V is recognized as an appropriate voltage range.

  In the voltage of the distribution line shown in FIG. 4 (a), when the situation of the voltage of the solid line to which the control of the present invention is applied is compared with the situation of the voltage of the broken line by the control to which the present invention is not applied, it is shown by the solid line. In the control method of the present invention, the voltage is maintained in an appropriate range from the beginning to the end of the distribution line.

  On the other hand, in the control method to which the present invention indicated by the broken line is not applied, the voltage drops to the vicinity of the lower limit value at the end of the distribution line due to the voltage drop phenomenon due to the distribution line.

  In the power factor of the distribution line shown in (b) of FIG. 4, when comparing the situation of the solid line power factor to which the control of the present invention is applied and the situation of the broken line power factor by the control to which the present invention is not applied, In the control method of the present invention indicated by the solid line, the reactive power control amount of the distributed power sources 81 to 84 is maintained at an appropriate value from the beginning to the end of the distribution line 41, so that the power factor is constant over the entire area of the distribution line 41. Maintained.

  On the other hand, in the control method to which the present invention indicated by the broken line is not applied, the reactive power amount of the distributed power sources 81 to 84 increases as the distance from the end of the distribution line 41 increases, and the power factor decreases. Decreases to the lower limit indicated by the alternate long and short dash line defined in the grid connection guidelines.

  In the active power of the distribution line shown in (c) of FIG. 4, when comparing the situation of the solid line power factor to which the control of the present invention is applied and the situation of the broken line power factor by the control to which the present invention is not applied, In the control method of the present invention indicated by the solid line, the active power [PU] can be maintained at a constant value from the start end to the end of the distribution line 41.

  In other words, by controlling the output of reactive power, which is the output of a plurality of distributed power sources linked to the power distribution system, by suppressing the variation between distributed power sources, the power factor of specific distributed power sources can be prevented from being lowered or the output can be limited. This is because it becomes possible.

  On the other hand, in the control method to which the present invention indicated by the broken line is not applied, the reactive power that is the output of the plurality of distributed power sources is not adjusted, and thus variation occurs between the distributed power sources. The problem that the active power value greatly decreases as it approaches the end cannot be solved.

  As is clear from the above description, according to the present embodiment, a plurality of power supplies for maintaining a proper power quality in a distribution system in which a plurality of distributed power sources are connected and for eliminating voltage fluctuations in the distribution system. It is possible to realize a power quality maintenance support method and a power quality maintenance support system for a distribution system in which a plurality of distributed power sources are linked, in which the occurrence of variations among the distributed power sources is suppressed by adjusting the output of the distributed power sources.

  The present invention is applicable to a power quality maintenance support method and a power quality maintenance support system for a distribution system in which a plurality of distributed power sources are interconnected.

1 is an overall configuration diagram of a power quality maintenance support system for a distribution system in which a plurality of distributed power sources are linked according to an embodiment of the present invention. The flowchart which shows the content of the control in the monitoring control server of the electric power quality maintenance assistance system which is an Example of this invention described in FIG. The flowchart which shows the content of the control which determines the control value of the distributed power supply in the supervisory control server of the electric power quality maintenance assistance system which is an Example of this invention described in FIG. FIG. 1 shows a distribution line condition under control of a voltage maintenance support system of a distribution system in which a plurality of distributed power sources according to an embodiment of the present invention described in FIG. 1 to FIG. 3 are connected. (B) is a distribution diagram showing the power factor of the distribution line, (c) is a distribution diagram showing the effective power of the distribution line. The control block diagram which shows the detailed structure of the monitoring control server of the electric power quality maintenance assistance system which is an Example of this invention described in FIG.

Explanation of symbols

1: power quality maintenance support system, 2: distribution system, 4: bus, 6: circuit breaker, 7: pole transformer, 9: communication line, 11: monitoring control server, 12: display device, 13: input device, 14, 15: Storage device, 21-26: Communication control device, 31: Voltage sensor, 32: Current sensor, 41: Distribution line, 81-84: Distributed power source, 100: Monitoring control server, 101: Monitoring information collector 102: Distribution system state estimation calculator 103: Distribution line voltage deviation point search calculator 104: Restriction condition calculator 105: Control value optimum calculator 106: Distribution system power flow calculation and voltage distribution calculation 107: control command calculator for distributed power supply, 141: voltage and current measurement data of distribution system, 142: power factor measurement data, 151: distribution system condition data, 152: distributed power supply characteristic data.

Claims (2)

  1. Collect the status data of the distribution system with which multiple distributed power sources are linked and the operation data of these distributed power sources, search for voltage deviation points where the distribution lines of the distribution system deviate from the predetermined voltage range, Power distribution when a power factor or reactive power output is calculated as a control value for a plurality of distributed power sources linked to the distribution system when there are voltage deviation points, and a plurality of distributed power sources are operated with the calculated control values Calculates the power flow status and voltage distribution of the system, calculates the control command value for the distributed power supply to be controlled based on the calculated power flow status and voltage distribution, operates the distributed power supply, and distributes power In a power quality maintenance support method for a distribution system in which a plurality of distributed power sources that maintain the system voltage in an appropriate range are connected,
    The control values for a plurality of distributed power sources that are linked to the power distribution system when there is a voltage deviation point when each operation, so that the control value of the output adjustment to the distributed power supply within a desired range, distributed power sources The control value that is output with respect to is configured to set the constraint condition with reference to the stored control history and calculate the control value, and to collect the state data of the collected power system and the operation data of the distributed power source the voltage deviation point the distribution using the estimated value estimated voltage of the distribution system is searched from the control value a plurality of distributed power sources, characterized in Rukoto stored as a new control record is interconnection Power quality maintenance support method for distribution system.
  2. A distribution system in which a plurality of distributed power sources are linked together and a detector installed in each of the plurality of distributed power sources to collect status data of the power distribution system and operation data of the plurality of distributed power sources. As a control value for a plurality of distributed power sources linked to the distribution system when there is a voltage deviation point and a voltage deviation point search computing unit for a distribution line that searches for a voltage deviation point where the voltage deviates from a predetermined voltage range Control value calculator for distributed power source that calculates power factor or reactive power output respectively, and distribution system that calculates power flow status and voltage distribution when operating multiple distributed power sources with calculated control value Power distribution calculation and voltage distribution calculator, and a distributed power source that operates a distributed power source by calculating a control command value for the distributed power source to be controlled based on the calculated power flow state and voltage distribution. A plurality of distributed power quality maintenance supporting system of the distribution system in which power is interconnection with the monitor control server and a control command value calculator that,
    Refer to the stored control history for the control values output to the distributed power supply so that the control values for the multiple distributed power supplies linked to the power distribution system fall within the desired range when there are voltage deviation points . The constraint condition calculator for calculating the constraint condition, and the state data of the power system and the operation data of the distributed power source collected by each detector are collected via the communication system, and the distributed power source is linked. A voltage distribution state estimation unit for estimating the distribution state of the distribution system voltage, the voltage deviation point is searched from the estimated value of the voltage distribution state by the state estimation calculation unit , the control value is newly power quality maintenance supporting system of the plurality of distributed power sources, wherein Rukoto stored as the control history is interconnection distribution system.
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