JP2013121305A - Power distribution system monitoring control device, power distribution system monitoring control method, and photovoltaic power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a rise in power distribution line voltage which occurs when a photovoltaic power generation system is connected to a power distribution system, as well as reduce a frequency at which consequential power injection from the photovoltaic power generation system into the power distribution system is restricted.SOLUTION: A power distribution line 6b connected to a CB 3b via an LRT 2 of a substation 1 has a section switch 7, an SVR 90 and a pole transformer 10a connected thereto, the pole transformer 10a having a low voltage distribution line 11a connected to the secondary side circuit thereof. A dwelling house 12c connected to the low voltage distribution line 11a has a photovoltaic power generation system constructed thereon, to which are connected a solar panel 13c and a PCS 14c to adjust the generated power of the solar panel 13c. Operation history information 21a of the PCS 14c is fed into a PCS operation condition input terminal 28 of a power distribution system monitoring control device 46 via a communication IF 20, and the voltage distribution of the power distribution line 6b is analyzed by a system analysis server 26. The voltage levels of the LRT 2, the SVR 90 and the pole transformer 10a are optimally determined on the basis of the result of voltage distribution analysis of the power distribution line 6b.

Description

  The present invention relates to a power distribution system monitoring and control device that monitors and controls power quality such as the voltage of a power distribution system, and more particularly to a voltage increase in a power distribution system that occurs when a photovoltaic power generation system is installed in a house, or to a power distribution system. The present invention relates to a power distribution system monitoring and control device, a power distribution system monitoring and control method, and a photovoltaic power generation system that perform monitoring control of a power distribution system in order to reduce injection suppression of power generation amount.

  In recent years, natural energy power generation systems that use renewable energy such as wind, geothermal, hydropower, and sunlight have been increasing due to awareness of issues such as global warming and resource depletion of fossil fuels. However, these renewable energies have the problem that the generated power fluctuates depending on weather conditions such as the weather, and also the problem of voltage rise that occurs when the generated power is supplied to the distribution system (for example, the commercial power system). is there. In Japan, Article 26 Paragraph 1 of the Electricity Business Law and Article 44 Paragraph 1 of the Electricity Business Enforcement Regulations stipulate that the voltage supplied to consumers should be maintained at 101V ± 6V. In particular, an increase in the voltage of the power distribution system may cause a deterioration in the lifespan of home appliances or an increase in power consumption, and may reduce the amount of power generated by a solar power generation system installed in a consumer.

  That is, in the photovoltaic power generation system, when generated power that exceeds the power consumed by the customer who installed it is generated, the generated power is injected into a distribution system such as a commercial power system. However, if the generated power of the photovoltaic power generation system is injected into the distribution system, the voltage of the distribution system rises. Therefore, in the photovoltaic power generation system, when the voltage of the distribution line exceeds the specified value, the photovoltaic power generation It is obliged to limit the amount of power generated by the system. Therefore, various supervisory control methods have been studied in order to monitor and control the voltage of the distribution system.

  For example, when a distributed power source such as a solar power generation system is injected into a distribution system such as a commercial power system, the power quality of the distribution system is determined based on the system configuration data such as the length of the distribution line and the planned injection position. The technique of the monitoring control method of the distribution voltage to evaluate is disclosed (for example, refer patent document 1). According to this technology, when there is a possibility that the voltage to be injected into the distribution system may exceed the specified range, a load-tap switching transformer (LRT: Load Ratio control Transformer) or a voltage regulator (SVR: Step) A method of determining a set value (boost voltage) such as a voltage regulator in accordance with a variable voltage is shown. This technique also shows that when power quality is evaluated, measured values of the voltage and current measured in the middle of the distribution system and the transmission voltage and current of the substation can be used.

  In addition, a power quality monitoring terminal is provided in the vicinity of the power receiving and distribution facilities of power consumers, and this power quality monitoring terminal is connected to a power distribution system monitoring server on the power company side to perform monitoring control, thereby performing power quality monitoring. A technique is disclosed in which monitoring processing is shared by a terminal and a distribution system monitoring server, and a monitoring system is constructed without imposing an excessive burden on one side (see, for example, Patent Document 2). According to this technology, power quality indexes of a plurality of items having different properties can be integrated and handled as a single integrated quality index. Therefore, it is possible to easily check the power quality of the power distribution facilities at a specific customer. it can. That is, when monitoring work is performed on a power distribution facility of a specific customer, individual power quality indicators of the power distribution facility, for example, frequency of occurrence of instantaneous voltage drop, numerical value of frequency deviation, unbalance rate, etc. There is no need to confirm each item, and by confirming only the integrated quality index, the power quality of the power receiving / distributing facility can be confirmed. Therefore, the monitoring work itself can be simplified and the maintenance cost can be reduced.

  In addition, as a countermeasure on the side of the photovoltaic power generation system linked to the distribution system, a power conditioning system (PCS: Power Conditioning System) including an inverter provided in the photovoltaic power generation system is used. A technique for suppressing the output of the generated power of the solar power generation system when the power is high is disclosed (for example, see Patent Document 3). According to this technology, when the power consumption of the load is less than the power supplied from the solar cell array, the DC power output from the solar cell array is converted to AC power and output to the load, and the surplus The AC power is connected to the system power supply of the power distribution system to reverse flow. When the power consumption of the load exceeds the power supplied from the solar cell array, the DC power output from the solar cell array is converted into AC power and output to the load, and the shortage of AC power is compensated from the system power source. To make it work. In this case, the supply path from the PCS (power conditioner) of the photovoltaic power generation system to the load and the injection path from the PCS to the system power supply are not directly electrically connected. As a result, regardless of the AC voltage of the system power supply, the supply from the PCS to the load can be output with an AC voltage of an arbitrary voltage. It is possible to prevent an increase in the AC voltage output to the load when the power flow is performed, thereby preventing the life of the device used as the load from being reduced.

JP 2004-88978 A Japanese Patent No. 4751278 JP 2003-116224 A

  In general, when evaluating the power quality by calculating the voltage distribution for each position on the distribution line in a distribution system such as a commercial power system, the impedance of the distribution line, the active / reactive power amount for each consumer, and It is only necessary to provide a substation delivery voltage. However, in the technique disclosed in Patent Document 2, voltage calculation is possible because the power quality monitoring terminal is installed in each consumer, but the power quality monitoring terminal, the distribution system monitoring server, the communication network, and the like In addition, since a power quality monitoring terminal must be provided in a general home, the total equipment cost increases.

  Therefore, as disclosed in Patent Document 1, the direction of power flow (tidal current) is estimated from the measured values of voltage and current provided at each point of the substation sending current and distribution lines, and the distribution system Techniques for predicting voltage can be used. However, in order to improve the power quality monitoring accuracy, it is necessary to increase the number of measurement points for measuring the voltmeter / ammeter. As a result, even if the technique of Patent Document 1 is used, the equipment cost increases. End up.

  On the other hand, since the technology of Patent Document 3 is a countermeasure technology for adjusting the output of generated power on the PCS (power adjustment device) side installed in a consumer equipped with a solar power generation system, This is effective in suppressing voltage rise and injecting generated power into a distribution system such as a commercial power system. However, the scale of the PCS installed in each consumer is complicated, and the introduction of renewable energy for preventing global warming may be hindered by heat generated from each PCS or standby power of the PCS. There is.

  That is, when a photovoltaic power generation system is connected to a power distribution system, the voltage distribution state of the power distribution system cannot be predicted with high accuracy at a low equipment cost even if any of the above-described techniques is applied. Therefore, an increase in the distribution line voltage cannot be suppressed, and the frequency of suppressing the power injection to the distribution system cannot be reduced.

  This invention is made | formed in view of such a situation, the rise in the distribution line voltage generated when a photovoltaic power generation system is connected to a distribution system, and the accompanying photovoltaic power generation system to a distribution system. It is an object of the present invention to provide a distribution system monitoring and control device, a distribution system monitoring and control method, and a solar power generation system that can reduce the frequency of suppressing power injection at low cost.

In order to solve the above problems, the distribution system monitoring and control device of the present invention is configured as follows.
In the first aspect of the invention, the distribution information collection means for collecting the facility information of the distribution system that supplies power to the consumer from the substation and the measurement information of the distribution system, the measurement information and the facility of the distribution system Voltage distribution means for analyzing the voltage distribution of the distribution system based on the information and determining a set value for determining the voltage level of the voltage adjustment means of the distribution system based on a preset criterion value; The power conditioner operation status input means for acquiring the operation history information of the power conditioner in the solar power generation system connected to the power distribution system, and the power distribution using the operation history information acquired by the power conditioner operation status input means A distribution system monitoring and control device comprising: system analysis means for analyzing the voltage distribution of the system.

  In invention of Claim 8, the distribution information collection procedure which collects the facility information of the distribution system which supplies electric power to a consumer from a substation, and the measurement information of the said distribution system, The said measurement information and said facility of the said distribution system A voltage management procedure for analyzing a voltage distribution of the distribution system based on the information and determining a set value for determining a voltage level of the voltage adjustment means of the distribution system based on a preset determination reference value; Using the power conditioner operation status input procedure for acquiring the operation history information of the power conditioner in the solar power generation system connected to the distribution system, and using the operation history information acquired in the power conditioner operation status input procedure A distribution system monitoring and control method characterized by executing a system analysis procedure for analyzing the voltage distribution of the distribution system.

  In invention of Claim 11, it is a solar power generation system provided with the solar panel and the electric power adjustment apparatus which adjusts the electric power generation amount which this solar panel generates, Comprising: The said electric power adjustment apparatus is at least, Storage means for recording operation history information including the power generation amount, the amount of electricity composed of voltage, current, and power at the connection point between the photovoltaic power generation system and the distribution line, and time, and recorded in the storage means And a communication interface that communicates the operation history information to a distribution system monitoring and control device.

  According to the present invention, even when the photovoltaic power generation system is connected to the distribution system, the voltage distribution of the distribution system is based on the operation history information of the power conditioner (PCS) that adjusts the generated power of the photovoltaic power generation system. Distribution system monitoring and control device, distribution system monitoring and control method capable of avoiding the increase in system voltage and the suppression of injection of power generation into the distribution system with a small equipment cost. And a photovoltaic power generation system can be provided.

It is a lineblock diagram showing a power distribution system provided with a power distribution system monitoring control device and a photovoltaic power generation system concerning one embodiment of the present invention. It is a system diagram which shows the structure of a general power distribution system. It is a characteristic view which shows the voltage distribution of a distribution line for demonstrating the control method of the distribution line voltage in the distribution system shown in FIG. It is a figure which shows an example of the driving history information 21a of PCS14c stored in the memory 19 of the power adjustment apparatus (PCS) 14c shown in FIG. It is the detailed block diagram which showed the function of each server of the power distribution system monitoring control apparatus 46 shown in FIG. It is a flowchart which shows the flow of operation | movement of the power distribution system monitoring control apparatus 46 shown in FIG. It is a block diagram of the solar energy power generation system which concerns on 4th Embodiment of this invention.

"Overview"
The distribution system monitoring and control device according to the embodiment of the present invention includes the operation history information of the power conditioner in the photovoltaic power generation system linked to the distribution system such as the commercial power system, and the measured values of the voltage and current of the distribution system. As input data, the voltage distribution on the distribution line in the distribution system is analyzed with high accuracy. At this time, the operation history information of the power adjustment device includes the time, the amount of electricity (voltage / current) and power factor at the distribution line connection point of the photovoltaic power generation system, and the amount of power generation of the photovoltaic power generation system. In the analysis of the voltage distribution on the distribution line, power flow calculation (that is, power flow calculation) can be analyzed. Thus, by analyzing the voltage distribution on the distribution line and the flow direction, it is possible to avoid an increase in the system voltage of the distribution system and a suppression of injection of power generation into the distribution system.

  Hereinafter, embodiments of a power distribution system monitoring control device, a power distribution system monitoring control method, and a photovoltaic power generation system according to the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted. In addition, when there are many identical elements, alphabets are sequentially added to the same numerals, and when a plurality of identical elements are expressed together, they are expressed only by common numerals. For example, when the individual pole transformers 10a, 10b, 10c,... Are collectively represented, the pole transformer 10 is represented, and when the individual section switches 7a, 7c, 7d are collectively represented, classification. It is expressed as switch 7.

<< First Embodiment >>
<General distribution system configuration>
First, in order to facilitate the understanding of the distribution system monitoring and control apparatus according to the present embodiment, a general distribution system configuration and a distribution line voltage (system voltage) control method will be described. FIG. 2 is a system diagram showing a configuration of a general power distribution system. FIG. 3 is a characteristic diagram showing a distribution of voltage on the distribution line for explaining a control method of the distribution line voltage in the distribution system shown in FIG. The horizontal axis in FIG. 3 indicates the distribution line length, and the vertical axis in FIG. 3 indicates the distribution line voltage.

As shown in FIG. 2, a general distribution system includes a load-time tap switching transformer (LRT) 2, a circuit breaker (CB) 3a, and a voltage / current sensor 5 installed in a substation (not shown). , A plurality of section switches 7 a, 7 b, 7 c distributed and connected from the voltage / current sensor 5 to a distribution line 6 installed in a consumer, a voltage regulator connected to a desired location of the distribution line 6 ( SVR) 90, and pole transformers 10a, 10b, 10c, 10d, and 10e distributed and connected in the respective sections of the section switches 7a, 7b, and 7c.
On-load tap switching transformer (LRT) 2 installed in the substation, voltage regulator (SVR) 90 connected to a desired location of distribution line 6, pole transformers 10a, 10b, 10c, 10d, 10e is a voltage adjusting means for adjusting the voltage of the distribution system.

  More specifically, the LRT 2 installed in the substation converts, for example, a high voltage of 275 kv transmitted from the high voltage transmission line side (left side of the figure) (not shown) into a rated voltage of 6.6 kV, The rated voltage of .6 kV is supplied to the distribution line 6 installed in the consumer via the CB 3a. In addition, a voltage / current sensor 5 is provided at a connection point between the CB 3a and the distribution line 6 in the substation. The voltage / current sensor 5 measures the voltage / current sent from the substation to the distribution line 6. The Further, the distribution line 6 is provided with section switches 7a, 7b, 7c at a plurality of locations in order to finely separate the accident section. In addition, an SVR (voltage regulator) 90 is provided at a desired location in the middle of the distribution line 6 for boosting and adjusting the distribution line voltage dropped below the voltage lower limit value. Although not shown in the figure, the measurement values of the voltage / current sensors 5 provided in the respective section switches 7a, 7b, 7c can be collected in the substation via the communication network. The measurement value of the voltage / current sensor 5 is measurement information of the distribution system. The supervisory control of the division switches 7a, 7b, and 7c is performed in a power distribution automation system (not shown) that is a host device.

  Further, pole transformers 10a, 10b, 10c, 10d, and 10e are branched and connected to various sections of the distribution line 6 in sections of the section switches 7a, 7b, and 7c. Thus, the rated voltage 6.6 kV of the distribution line 6 is converted into an alternating low voltage 100V or 200V. Then, the AC low voltage 100V or 200V is transmitted from each pole transformer 10 to a consumer such as each house, business office, or sales office via a low-voltage distribution line (not shown), and power is supplied to each consumer. It is configured to be supplied.

<General power distribution system operation>
Here, as shown in FIG. 2, the distribution of the distribution line voltage when there is no power generation facility such as a photovoltaic power generation system on the distribution line 6 of the distribution system will be described. That is, when there is no power generation facility such as a photovoltaic power generation system on the distribution line 6, as shown in the voltage distribution characteristic of the distribution line in FIG. 3, the distance from the substation at the origin of the horizontal axis The distribution line voltage decreases proportionally. In FIG. 3, as the distance from the substation (origin) increases (that is, as the length of the distribution line increases), the distribution line voltage decreases with a constant slope. The slope of the distribution line voltage drop varies depending on the amount of power consumed by the consumer. For example, when the consumer's power consumption is large, the amount of decrease in the distribution line voltage increases, and the distribution line voltage may fall below the voltage lower limit (6.2 kv).

  Therefore, in order to avoid this, an SVR 90 is provided in the middle of the distribution line 6 as shown in FIG. 2, and the distribution line voltage may fall below the lower voltage limit (6.2 kv) as shown in FIG. Boosts the distribution line voltage by this SVR90 to prevent further voltage drop. At this time, since the sending current of the voltage / current sensor 5 in the substation is proportional to the total power consumption of the distribution line 6, the LRT 2 determines the sending voltage from the substation to the distribution line 6 based on the magnitude of the load current. Control is in progress.

  As another means for adjusting the customer side voltage, there is a transformation ratio of each pole transformer 10. Normally, each pole transformer 10 has a transformation ratio of 6.6 kV / 200 V, but the distribution line voltage is always higher than 6.6 kV near the substation. The transformer ratio is 6.8 kV / 200 V, and the voltage ratio on the customer side is 101 V, so that the transformer ratio is finely adjusted for each installation location of each pole transformer 10 and each pole transformer 10 is adjusted. Are installed at each location. In addition, the voltage of the distribution line 6 may deviate from the upper voltage limit (7.0 kV) and the lower voltage limit (6.2 kV) because the load power consumption is the maximum value or the minimum value. The voltage distribution of the distribution line 6 is predicted by periodically analyzing the power system using the past data of the maximum value and the minimum value of the current sent from the substation. The power distribution system is monitored and evaluated by evaluating whether the value and the voltage lower limit value are deviated.

<Configuration of power distribution system according to this embodiment>
Next, the configuration of the power distribution system according to one embodiment of the present invention will be described. FIG. 1 is a configuration diagram illustrating a power distribution system including a power distribution system monitoring control device and a photovoltaic power generation system according to an embodiment of the present invention. As shown in FIG. 1, the distribution system of the present embodiment uses a distribution system monitoring and control device 46 that monitors and controls the state of the entire distribution system network, and a high voltage of, for example, 275 kv sent from a high-voltage transmission line (not shown). Substation 1 that converts to a rated voltage of .6 kV, distribution lines 6a and 6b that are connected to substation 1 and supply a rated voltage of 6.6 kV in multiple systems (two systems in FIG. 1), and these distribution lines 6a and 6b are configured by various devices connected in series or in a branched manner (that is, the section switch 7, the pole transformer 10, the remote control station 8, and the SVR 90). The distribution system monitoring and control device 46 can acquire various information of the substation 1 and the distribution lines 6a and 6b through the dedicated IP network 22 and the public line IP network 49.

  In other words, the distribution line 6a laid toward the consumer is distributed in each section of the plurality of section switches 7a, 7c, 7d distributed in series and the section switches 7a, 7b, 7c. Branch-connected transformers 10b, 10c, 10d, 10e, a remote control station 8a connected to the section switch 7a, a far control station 8b connected to the section switch 7c, and A remote control station 8c connected to the sorting switch 7d is arranged.

  More specifically, the distribution line 6a connected to the circuit breaker (CB) 3a of the substation 1 and the voltage / current sensor 5a includes a section switch 7a, 7c, 7d and a pole transformer 10b, 10c, 10d and 10e are connected to the primary circuit, and low voltage distribution lines (not shown) are connected to the secondary circuits of the pole transformer 10 respectively. Further, remote control stations 8a, 8b and 8c for performing remote control are connected to the respective division switches 7a, 7c and 7d, and these remote control stations 8a, 8b and 8c are connected to communication lines. It is connected to a substation TC (Tele-Control: remote control panel) 4 through 9a.

  Further, the distribution line 6b connected to the CB 3b of the substation 1 and the voltage / current sensor 5b includes the section switches 7e, 7g, 7h connected in series to the system, and the voltage adjustment connected in series to the system. (SVR) 90 and pole transformers 10a, 10f, 10g, 10h, 10i branched from the system and connected to the primary circuit are connected to the secondary circuit of each pole transformer 10. Are connected to a 100V or 200V low voltage distribution line laid in each consumer. In addition, although the low voltage distribution line corresponding to all the pole transformers 10 is not displayed in FIG. 1, the low voltage distribution lines 11a and 11d are respectively shown in the secondary side circuits of the pole transformers 10a and 10f, for example. Is connected.

  That is, as a typical example, the low-voltage distribution line 11a is connected to the secondary circuit of the pole transformer 10a, and the low-voltage distribution line 11d is connected to the secondary circuit of the pole transformer 10f. The secondary transformers 10b, 10c, 10d and 10e connected to the distribution line 6a and the secondary transformers 10g, 10h and 10i connected to the distribution line 6b are also connected to the low-voltage distribution line. Are connected, but they are omitted to simplify the drawing. Further, remote control stations 8d, 8e, 8f for remote control are connected to the section switches 7e, 7g, 7h connected to the distribution line 6b, respectively, and these remote control stations 8d, 8e. , 8f are connected to the substation TC4 via the communication line 9b. More specifically, the substation 1 includes an LRT 2, a substation TC4, CBs 3a and 3b, and voltage / current sensors 5a and 5b. The substation TC4 includes voltage / current sensors 5a and 5b. It is connected to the.

  Since these configurations are substantially the same as the power distribution system described in FIG. 2, further description is omitted. In the present embodiment, in addition to the above configuration, the low-voltage distribution line 11a connected to the secondary side circuit of the pole transformer 10a in which the primary circuit is connected to the distribution line 6b, for example, includes the houses 12a and 12b. , 12c indoor distribution lines (hereinafter the terminology of indoor distribution lines is omitted), and a solar panel 13c and a power conditioner (PCS) 14c are connected to the house 12c. Moreover, the house 12d is connected to the low voltage distribution line 11d connected to the secondary circuit of the pole transformer 10f connected to the distribution line 6b, and the solar panel 13d and the power adjustment device ( PCS) 14d is connected.

  That is, the low voltage stepped down from 6.6 kV to 100 V or 200 V by the pole transformers 10a, 10f connected to the distribution line 6b is supplied to the houses 12a, 12b, 12c, 12d via the low voltage distribution lines 11a, 11d. It is comprised so that it may be supplied to. Furthermore, a solar panel 13c and a power adjustment device (PCS) 14c are connected to the house 12c, and a solar panel 13d and a PCS 14d are connected to the house 12d. More specifically, the house 12c is configured such that a solar power generation system is constructed by the solar panel 13c and the PCS 14c, and the generated power of the solar panel 13c is adjusted by the PCS 14c.

<Configuration of distribution system monitoring and control device>
The distribution system monitoring and control device 46 shown in FIG. 1 is configured such that a plurality of processing servers operate in cooperation with a LAN (Local Area Network) 29. That is, the distribution system monitoring and control device 46 predicts and analyzes the power distribution and voltage distribution of the distribution system from the system analysis server (system analysis means) 26 and the prediction result analyzed by the system analysis server 26 to determine the voltage in the distribution line 6. A voltage management server (voltage management) that determines the presence or absence of a voltage that is greater than or equal to the upper limit value and less than or equal to the voltage lower limit value, and determines the set value (boost voltage) of the on-load tap switching transformer (LRT) 2 or voltage regulator (SVR) 90 Means) and a facility management server (equipment for supporting facility update by storing and managing facility data such as the length and impedance of the distribution line 6, the type of the division switch 7 and the pole transformer 10, and each connection point) Management means) 45, and the installation position and capacity of the photovoltaic power generation system are managed. When a photovoltaic power generation system is newly introduced, it is linked with the system analysis server 26 and the voltage management server 25 to A distributed power management server (distributed power management means) 27 for evaluating the influence of voltage rise due to the installation of the stem, and a PCS operation status input terminal (power adjustment device operation) for inputting operation history information 21a of the power adjustment device (PCS) 14 A distribution information collection server (distribution) that collects various information of the substation 1 by connecting to a substation TC (substation remote control panel) 4 in the substation 1 via a dedicated IP network 22 and a status input means) 28 Information collecting means) 24, and a PCS information collecting server 47 that collects information of the PCS (power adjustment device) 14 from the user's personal computer (PC) via a public line IP network (communication network) 49. Has been.

  The LAN 29 is connected to an external server of the power distribution system monitoring and control device 46, for example, an automatic meter reading server (automatic meter reading means) 48 of the sales office 23. The automatic meter reading server 48 is connected via a public line IP network 49. The operation history information of the PCS 14c can be acquired from a meter reader terminal device (not shown).

<Configuration of power conditioner>
Further, the detailed internal configuration of the PCS (power adjustment device) 14c is shown in an enlarged view attached close to the PCS 14c in FIG. 1, and the direct-current voltage generated by the solar panel 13c is converted to a direct current having a desired voltage level. A DC-DC converter 15 that converts to an input voltage, a DC input voltage supplied from the DC-DC converter 15 is converted to an AC voltage, and AC power from the AC voltage is supplied to a home appliance (not shown). An inverter 16 that converts surplus power generated by the solar panel 13c into alternating current and injects it into the low-voltage distribution line 11a, and an output voltage and output current (V, I) of the inverter 16 are fed back to provide a DC-DC converter. 15 and the control part 17 which controls the inverter 16, the timer 18 which measures the operation time of PCS14c, and the operation history information 21a of PCS14c Etc. memory (storage means) 19 for storing is configured to include a communication interface (IF) 20 for transmitting the operation history information 21a of PCS14a to the power distribution system monitoring and control device 46. Note that the PCS 14d constructed in the house 12d connected to the low-voltage distribution line 11d has the same configuration as the PCS 14c, and a duplicate description is omitted.

  Note that the voltage distribution of the distribution system (distribution lines 6a, 6b) varies depending on the power consumption of the consumer. To evaluate whether the voltage distribution is within the specified range, the maximum voltage and the minimum voltage of the distribution system What is necessary is just to evaluate at the time of voltage. Therefore, once evaluation is performed, thereafter, evaluation is performed when the distribution line 6 is increased / reduced in the distribution system or when a photovoltaic power generation system is newly installed, and on-load tap switching transformer (LRT) is based on the evaluation result. 2 and the set value (boost voltage) of the voltage regulator (SVR) 90 may be updated. Therefore, the voltage distribution may be evaluated and managed on a monthly or seasonal basis, except when the distribution system is changed. Conventionally, the voltage distribution is predicted based on the history of voltage / current data measured in the past, but in this embodiment, the input means for inputting the operation history information 21a of the PCS 14c, 14d, that is, the PCS operation status Since the input terminal 28 is provided in the distribution system monitoring control device 46, the number of input points of voltage / current used for voltage analysis increases, so that the analysis accuracy can be improved.

<Flow of operation history information of power conditioner>
Next, the flow of the operation history information 21a of the PCS (power adjustment device) 14c in the present embodiment will be described with reference to FIG. In the following description, when it is simply expressed as operation history information, it indicates the operation history information 21a of the PCS (power adjustment device) 14c. The distribution information collection server 24 of the distribution system monitoring control device 46 is connected to the substation TC4 installed in the substation 1 via the communication line 9 via the dedicated IP network 22. On the other hand, the voltage / current sensors 5a and 5b in the substation 1 are connected so that direct communication with the substation TC4 is possible. In addition, each remote control station 8 (8a, 8b, 8c) connected to each section switch 7 (7a, 7c, 7d, 7e, 7g, 7h) distributed in the distribution line 6 (6a, 6b). , 8d, 8e, 8f) is communicated to the substation TC4 via the respective communication lines 9a, 9b. Therefore, the sensor information of the voltage / current sensors 5a and 5b collected in the substation TC4 and the sensor information of each remote control station 8 connected to each section switch 7 are transmitted via the dedicated IP network 22. It is collected in the distribution information collection server 24 of the distribution system monitoring control device 46.

<< Second Embodiment >>
<Operation of power conditioner>
Next, the operation of the power adjustment device (PCS) 14c will be described in detail with reference to FIG. A plurality of pole transformers 10 are connected to distribution lines 6a and 6b to which electric power is supplied from an LRT (tap switching transformer at load) 2 via CBs (breakers) 3a and 3b. For example, the houses 12a, 12b, and 12c are connected to the secondary low-voltage distribution line 11a of the pole transformer 10a, and power (voltage / current) with an AC voltage of 100V or 200V is supplied to each house 12. . Among the houses 12, for example, a solar panel 13c is installed in the house 12c. Since the output voltage of the solar panel 13c is a direct current, the PCS 14c converts this direct-current voltage into an AC voltage of 100V or 200V by the DC-DC converter 15 and the inverter 16, and the household appliances in the home of the house 12c (see FIG. The power is supplied to the low-voltage distribution line 11a.

  That is, the PCS 14c converts the DC voltage output from the solar panel 13c into a DC voltage having a different voltage value, and converts the DC voltage converted by the DC-DC converter 15 into an AC voltage of 100V or 200V. The main structure is made up of an inverter 16 that converts the output of the inverter 16 and the output side of the inverter 16 is connected to the low-voltage distribution line 11a.

  More specifically, the control unit 17 of the PCS 14c inputs information on the voltage V and current I at the connection point of the low-voltage distribution line 11a, and controls the amount of power supplied from the inverter 16 to the low-voltage distribution line 11a. At this time, when the power consumption of a household electrical appliance (not shown) in the house 12c is larger than the generated power of sunlight, the PCS 14c controls the DC-DC converter 15 and the inverter 16 so that the maximum output power is obtained. . At this time, the power shortage of the home appliances in the house 12c is supplied from the low voltage distribution line 11a.

  On the other hand, when the power consumption of the home appliance in the house 12c is smaller than the generated power of the solar panel 13c, the output power of the DC-DC converter 15 and the inverter 16 is set to the maximum output power. There is a possibility that the voltage of the low-voltage distribution line 11a may increase due to the output power.

  Therefore, the control unit 17 determines that the PCS 14c is based on the power and power factor calculated by detecting the output voltage V and current I of the inverter 16 so that the voltage of the low voltage distribution line 11a does not exceed the voltage upper limit 107V. Controls the amount of power to be output. At this time, various methods for controlling the output power from the values of the voltage and current output from the inverter 16 have been proposed.

  As an example without using the figure, in a photovoltaic power generation system including a solar cell array, a system power source, a load, and a power conversion device, the power conversion device, the solar cell array, the system power source, and the load Different connection paths are provided between them. When the power consumption of the load is less than the power supplied from the solar cell array, the power conversion device converts the DC power output from the solar cell array into AC power and outputs the AC power to the load. The power is connected to the grid power source to reverse power flow. In addition, when the power consumption of the load exceeds the generated power supplied from the solar cell array, the power conversion device converts the DC power output from the solar cell array into AC power and outputs it to the load. Operate to supplement the power from the system power supply. Note that the connection path to the load and the connection path to the system power supply in the power conversion device are not electrically connected directly.

  Returning to FIG. 1, the PCS 14 c includes a timer 18 and a memory 19, and the operation history information 21 a of the PCS 14 c in the solar power generation system can be stored in the memory 19. FIG. 4 is a diagram illustrating an example of the operation history information 21a of the PCS 14c stored in the memory 19 of the power adjustment device (PCS) 14c illustrated in FIG. As shown in FIG. 4, the memory 19 records the voltage, power factor, maximum possible power generation amount, power generation amount at the corresponding time, power sale amount at the corresponding time, and the like for each date and time. This example shows driving history information when the power consumption at home is 1.5 kWh.

  The maximum possible power generation amount indicates the maximum power generation capacity of the solar panel 13c that changes according to the amount of solar radiation at that time. The maximum possible power generation amount can be estimated from changes in the output voltage and current value of the solar panel 13c. Since this maximum possible power generation increases in proportion to the amount of solar radiation, the maximum possible power generation increases as the sun rises from 8:00 to 10:30, and is maximum from 10:30 to noon. The amount of power generation is constant at 3.0 kWh. However, although the maximum possible power generation amount at time 10:00 is 2.5 kWh, the actual power generation amount at time 10:00 is suppressed to 2.2 kWh. Although the possible power generation amount is 3.0 kWh, the actual power generation amount is a constant value suppressed to 2.4 kWh. The reason is that the system voltage reaches the upper limit (107V) at time 10:00, exceeds the upper limit at time 10:30 and becomes 108V, so that the actual power generation amount can be suppressed after 10:00. Furthermore, after time 10:30, the actual power generation amount is suppressed to 2.4 kWh regardless of the maximum possible power generation amount. Moreover, since the power consumption amount at home is 1.5 kWh, the power generation amount is a constant value of 0.9 kWh as a result of the power generation amount being suppressed to 2.4 kWh after time 10:30.

  The operation history information 21a of the PCS 14c as shown in FIG. 4 can be taken out via the communication IF 20 of the PCS 14c as shown in FIG. Also, the installer of the solar power generation system can naturally confirm the contents by looking at the operation history information in FIG. Accordingly, the installer of the solar power generation system can sell 1.5 kWh because the maximum possible power generation amount after 10:30 is 3.0 kWh, for example, in the operation history information of FIG. Despite the capability, the system voltage after 10:30 exceeds the upper limit value to 108V, and as a result, the power generation amount was suppressed to 2.4 kWh. As a result, the power sales amount was suppressed to 0.9 kWh. I can know that. Further, the installer of the solar power generation system can obtain countermeasures for voltage increase of the system voltage by presenting the operation history information as shown in FIG. 4 to the electric power company.

  On the other hand, in the electric power company presented with the operation history information as shown in FIG. 4, the operation history information 21a is input to the PCS operation status input terminal 28 of the distribution system monitoring control device 46 shown in FIG. Can be used as input data for the voltage distribution calculation at, so that the calculation accuracy of the voltage distribution of the distribution lines 6a and 6b can be improved.

<< Third Embodiment >>
In the third embodiment of the present invention, the detailed configuration and operation of the distribution system monitoring and control device 46 installed on the power company side will be described.

<Detailed configuration of distribution system monitoring and control device>
FIG. 5 is a detailed configuration diagram showing the functions of each server of the distribution system monitoring control device 46 shown in FIG. As shown in FIG. 5, the distributed power management server (distributed power management means) 27 includes an operation history selection unit (operation history selection means) 50 and a photovoltaic power generation operation history DB (database) 37. . The equipment management server (equipment management means) 45 includes a power distribution system configuration DB 38. The distribution information collection server (distribution information collection means) 24 includes a substation voltage current DB 39 and a switch voltage current DB 40. The system analysis server (system analysis unit) 26 includes a distribution system analysis model generation unit 41 and a voltage / current distribution analysis unit (voltage / current distribution analysis unit) 42. The voltage management server (voltage management means) 25 includes a voltage control optimization unit 43 and a voltage distribution evaluation unit 44. Furthermore, although not shown in FIG. 1, the distribution system monitoring control device 46 includes a result display / analysis condition setting unit 36 as shown in FIG. 5.

  The operation history selection unit 50 of the distributed power management server 27 has a function of inputting operation history information from the automatic meter reading server 48 and the PCS information collection server 47 and selecting operation history information from any of the servers. Yes. The photovoltaic power generation operation history DB 37 of the distributed power management server 27 receives the operation history information selected by the operation history selection unit 50 and, based on the request for countermeasures for the operation history information from the consumer, the PCS operation status input terminal 28 ( It has a function of recording data (operation history information 21a) input from (see FIG. 1) for each photovoltaic power generation system.

  The distribution system configuration DB 38 of the facility management server 45 is represented by the distribution line length of the distribution line 6 shown in FIG. 1, the impedance of the distribution line 6, the installation location of the section switch 7 and the pole transformer 10, and the like. System facility information is recorded. Further, the substation voltage / current DB 39 of the distribution information collection server 24 records the measured values (measurement information) of the current and voltage measured by the respective pole transformers 10 shown in FIG. 1 in association with the measurement time. . The switch voltage / current DB 40 of the distribution information collection server 24 records the measured values of current and voltage measured by the respective section switches 7 shown in FIG. 1 in correspondence with the measurement time.

  The distribution system analysis model generation unit 41 of the system analysis server 26 uses an analysis model using each data recorded in the photovoltaic power generation operation history DB 37, the distribution system configuration DB 38, the substation voltage current DB 39, and the switch voltage current DB 40. It has the function to generate. The voltage / current distribution analysis unit 42 of the system analysis server 26 has a function of predicting and analyzing the voltage of the low-voltage distribution line 11 shown in FIG. 1 based on the analysis model generated by the distribution system analysis model generation unit 41. For example, the distribution system analysis model generation unit 41 generates a line model from the data of the line length and line type of the distribution line 6 and the low-voltage distribution line 11 shown in FIG. The voltage / current distribution analysis unit 42 designates a specific time from the line model, and measures voltage, current value, phase angle, and photovoltaic power generation that are measurement information of each part of the pole transformer 10 and the section switch 7. Various information on the voltage and power factor of the operation history DB 37 is collected, and the voltage of the low-voltage distribution line 11 is predicted and analyzed.

  The voltage distribution evaluation unit 44 of the voltage management server 25 has a function of determining whether or not the voltage of the low voltage distribution line 11 is within a specified value of 101V ± 6V based on information from the voltage / current distribution analysis unit 42. doing. Based on the information from the voltage distribution evaluation unit 44, the voltage control optimization unit 43 of the voltage management server 25 defines the voltage of the low voltage distribution line 11 when the voltage of the low voltage distribution line 11 exceeds the specified value. It has a function of issuing an instruction to the distribution system analysis model generation unit 41 so as to enter the value. The result display / analysis condition setting unit 36 has a function of displaying the voltage of the low-voltage distribution line 11 and setting analysis conditions performed by the system analysis server 26.

<Operation of distribution system monitoring and control device>
5 has the above functions, the operation history selection unit 50 of the distributed power management server 27 can operate from the automatic meter reading server 48 and the PCS information collection server 47. Information is input, and operation history information from any server is selected and transmitted to the photovoltaic power generation operation history DB 37. The photovoltaic power generation operation history DB 37 inputs the operation history information selected by the operation history selection unit 50, and from the PCS operation status input terminal 28 (see FIG. 1) based on a countermeasure request for operation history information from a consumer. The input data (operation history information 21a) is recorded for each consumer photovoltaic power generation system.

  The distribution system analysis model generation unit 41 of the system analysis server 26 records data (operation history information 21a input to the PCS operation status input terminal 28) recorded in the photovoltaic power generation operation history DB 37, and is recorded in the distribution system configuration DB 38. Data (information on distribution line 6, section switch 7, and pole transformer 10, etc.), data recorded in substation voltage / current DB 39 (information on current and voltage measured by pole transformer 10) And the analysis model (for example, line model of distribution line 6) of a distribution system is generated using the data (current and voltage information measured by section switch 7) recorded in switch voltage current DB40.

  The voltage / current distribution analysis unit 42 is based on the distribution system analysis model input from the distribution system analysis model generation unit 41, and the voltage value, current value, phase angle, and solar power generation operation history DB 37 measured at a specific time. The voltage of the low voltage distribution line 11 is predicted and analyzed using the voltage and the power factor. In this way, the voltage / current distribution analysis unit 42 performs analysis by using the operation time, voltage, power factor, and power generation amount of the PCS 14 as input data in addition to the conventional measurement data. The analysis accuracy when predicting and analyzing 11 voltages is improved.

  Next, the voltage distribution evaluation unit 44 of the voltage management server 25 determines whether or not the voltage of the low-voltage distribution line 11 is within a specified value of 101V ± 6V based on the information from the voltage / current distribution analysis unit 42. Here, when the voltage of the low-voltage distribution line 11 exceeds the specified value, the voltage control optimizing unit 43 performs the LRT (load tap) shown in FIG. 1 so that the voltage of the low-voltage distribution line 11 falls within the specified value. The output voltage of the switching transformer 2 is changed and input to the distribution system analysis model generation unit 41, and the voltage / current distribution analysis unit 42 predicts and analyzes the voltage of the low-voltage distribution line 11 again.

  Further, in the distribution system that evaluates whether or not the voltage of the low-voltage distribution line 11 is within the specified value, as shown in FIG. 1, when the SVR (voltage regulator) 90 exists, the boosted voltage of the SVR 90 is set. Instead, the above optimization calculation procedure is repeated. In this way, it is possible to determine the settling (boost voltage) of LRT2 or SVR90. As described above, according to the present embodiment, in the voltage distribution analysis of the distribution system, since the voltage, power factor, and power generation amount at the installation position of the photovoltaic power generation system can be used for the analysis, the analysis accuracy is improved. It is possible to suppress the voltage in the distribution line 11 from deviating from the specified value. Furthermore, control may be performed so as to suppress the voltage in the distribution line 6 from deviating from the specified value.

  Next, the operation flow of the distribution system monitoring control device 46 will be described using a flowchart. FIG. 6 is a flowchart showing an operation flow of the distribution system monitoring control device 46 shown in FIG. As shown in FIG. 6, first, the distribution system analysis model generation unit 41 of the system analysis server 26 performs distribution system analysis based on information (distribution system line information) recorded in the distribution system configuration DB 38 of the facility management server 45. A model is generated (step S1). Next, a specific time is specified (step S2), and the distribution system analysis model generation unit 41 of the system analysis server 26 measures the measurement recorded in the substation voltage current DB 39 of the distribution information collection server 24 at the specified specific time. Information (eg, voltage, current value, phase, etc.) is collected (step S3).

  Further, the distribution system analysis model generation unit 41 of the system analysis server 26 measures the measurement information (for example, voltage, current value, phase angle) recorded in the switch voltage / current DB 40 of the distribution information collection server 24 at the specified specific time. Etc.) are collected (step S4). Next, the distribution system analysis model generation unit 41 of the system analysis server 26 uses the voltage of the PCS (power adjustment device) 14 recorded in the solar power generation operation history DB 37 of the distributed power management server 27 at the specified specific time. The power factor is collected (step S5).

  And the voltage-current distribution analysis part 42 of the system | strain analysis server 26 estimates the voltage of the low voltage distribution line 11 of the said distribution system in the specified specific time based on each information collected by said step S3, S4, S5. Analysis is performed (step S6). Next, it is determined whether or not the voltage of the low-voltage distribution line 11 that has been predicted and analyzed is within a specified value of 101V ± 6V (step S7), and if the voltage of the low-voltage distribution line 11 is within the specified value (step S7). In step S7, Yes), the output voltage of the on-load tap switching transformer (LRT) 2 and the boost voltage of the voltage regulator (SVR) 90 are determined (step S8), and the process is terminated.

  On the other hand, if the voltage of the low-voltage distribution line 11 does not fall within the specified value of 101V ± 6V in step S7 (No in step S7), the on-load tap switching transformer (LRT) in the distribution system (distribution line 6). 2 is changed (step S9). Then, it is determined whether or not there is a voltage regulator (SVR) 90 in the distribution system (distribution line 6) (step S10). If there is no voltage regulator (SVR) 90 (No in step S10), step S6 is performed. Returning to step 4, the above-described processes are repeated. If the voltage regulator (SVR) 90 is present in the distribution system (distribution line 6) (Yes in step S10), the boost voltage of the voltage regulator (SVR) 90 is changed (step S11), and the process proceeds to step S6. Return and repeat the above-mentioned processes.

<< 4th Embodiment >>
Next, the configuration and operation of a photovoltaic power generation system will be described as a fourth embodiment. FIG. 7 is a configuration diagram of a photovoltaic power generation system according to the fourth embodiment of the present invention. First, the photovoltaic power generation system 60 shown in FIG. 7 and the surrounding configuration will be described. Note that the solar power generation system 60 includes a solar panel 13, a PCS (power adjustment device) 14, a personal computer (personal computer) 33, and a wireless terminal 34. The configuration shown in FIG. 7 is an entrance of a house 12 to which electric power is supplied from a pole transformer 10 branched from the distribution line 6 and a low voltage distribution line 11 connected to a secondary circuit of the pole transformer 10. Watt-hour meter (WHM) 30 installed in the PC, a PCS 14 connected to the power line 31 via the watt-hour meter (WHM) 30, a personal computer 33 connected to the power line 31, and a power line 31 And indoor solar home appliances 32a, 32b, and 32c connected to each other, and a solar panel 13 that is connected to the PCS 14 and installed on the roof of the house 12 or the like. The internal configuration of the PCS 14 is the same as that shown in the enlarged view of the PCS 14c in FIG. Further, the PCS 14 and the personal computer 33 are connected by wireless communication, and the personal computer 33 can be connected to a wireless base station 35 for automatic meter reading installed on an outdoor utility pole via a public line IP network (communication network) 49. It is configured as follows. A wireless terminal 34 may be attached to the watt-hour meter (WHM) 30.

  In such a configuration, power supplied to the house 12 via the distribution line 6 is transmitted from the low-voltage distribution line 11 of the house 12 via the wattmeter (WHM) 30 to the PCS 14, the personal computer 33, and the indoors. Are supplied to the home appliances 32a, 32b and 32c. Further, the generated power of the solar panel 13 is also supplied to the personal computer 33 and the home appliances 32a, 32b, and 32c via the PCS. On the other hand, as shown in FIG. 1, the operation history information of the PCS 14 is acquired via the communication IF 20 built in the PCS 14 and transmitted to the distribution system monitoring and control device 46 via the dedicated IP network 22.

  Hereinafter, the operation method of the PCS 14 and the communication method of the operation history information of the PCS 14 will be described using the photovoltaic power generation system 60 according to the present embodiment. That is, when the communication IF 20 (see FIG. 1) built in the PCS 14 has a wireless function, the following two communication methods are possible.

  In the first communication method, a wireless function similar to that of the PCS 14 is added to the personal computer 33, wireless communication is performed between the personal computer 33 and the PCS 14, and operation history information of the PCS 14 is taken into the personal computer 33. Thereafter, the user of the personal computer 33 confirms the operation history information of the PCS 14. If it is necessary to know the details of the operation history information of the PCS 14, the operation history information is communicated by e-mail from the personal computer 33 to the distribution system monitoring and control device 46 of the power company via the public line IP network 49. To do.

  Alternatively, the power company may establish a homepage for the installer of the solar power generation system 60 and have a function of uploading such operation history information. If the homepage of an electric power company is provided with such a function of disclosing operation history information, the user of the solar power generation system 60 can easily notify the operation history information. On the other hand, when the electric power company managing the operation history information acquires the information by e-mail, it is not necessary to transfer the operation history information to the distributed power management server 27 (see FIG. 1). Can contribute.

  In the second communication method, a wireless terminal 34 is provided in a watt-hour meter (WHM) 30 and the operation history information is recorded using a communication network (public line IP network 49) automatically detected by the automatic meter-reading radio base station 35. It is a method of performing notification. In this case, the operation history information is communicated from the PCS 14 to the automatic meter-reading wireless base station 35 via the wireless terminal 34 and wirelessly via the public line IP network 49. At this time, the automatic meter-reading radio base station 35 is connected to the automatic meter-reading server 48 (see FIG. 1) of the sales office 23 of the electric power company through an optical network (public line IP network 49). As shown in FIG. The operation history information is transferred from the meter-reading server 48 to the distributed power management server 27 of the distribution system monitoring control device 46. As a result, the distribution system monitoring control device 46 can use the PCS operation history information.

  If the wireless communication function of the PCS 14 is equivalent to an automatic meter reading wireless terminal (not shown) used by the meter reader, the PCS 14 directly communicates with the automatic meter reading wireless base station 35. Wireless communication becomes possible. In this way, by using the automatic meter reading communication network of the electric power company, it becomes possible to notify the operating history information of the PCS 14 to the electric power company without intervention of the installer of the solar power generation system 60.

<< 5th Embodiment >>
In the first to fourth embodiments described above, the case has been described in which all the operation history information of the PCS (power adjustment device) 14 is communicated to the distribution system monitoring control device 46 of the power company. However, in the analysis of the voltage distribution of the distribution system, not all of the operation history information for each time zone is required, but the voltage of the distribution system becomes the upper limit of the specified value, and the PCS 14 must suppress the power generation amount. Only the operation history information of the PCS 14 at the time is important. In other words, what is needed in the analysis of the voltage distribution of the distribution system is only the operation history information when the power consumption is maximum or minimum under the condition that the voltage of the distribution system may exceed the upper and lower limits. . In addition to this, when there is no distributed power source such as the solar power generation system 60, the operation history information is not necessary.

  Further, when there is a distributed power source such as the solar power generation system 60, a partial voltage increase may occur due to the relationship between the power generation amount of the solar power generation system 60 and the power consumption. Such partial voltage rise can be analyzed by modeling the solar power generation pattern assuming the amount of solar radiation, but in order to improve the analysis accuracy, it is modeled for each power generation pattern. Need to be analyzed.

  On the other hand, the time zone in which the amount of power generation is suppressed by the voltage rise in the PCS (power adjustment device) 14 in actual operation is clearly a condition that should be considered for voltage control measures. The operation history information to be input and stored in the control device 46 is the time, voltage, power factor, power generation amount, and power consumption amount when the PCS 14 suppresses the output of the generated power. By inputting and storing only such operation history information in the power system distribution system monitoring and control device 46, it is possible to prevent the database from increasing. In addition, when the operation history information of the PCS 14 is input to the distributed power management server 27 of the distribution system monitoring control device 46 using the communication network, only the data of the power generation suppression time may be stored when storing in the database. The effect of can be obtained.

<Summary>
As described above, the distribution system monitoring and control device 46 according to each embodiment of the present invention has the operation history of the PCS (power adjustment device) 14 in the photovoltaic power generation system 60 connected to a distribution system such as a commercial power system. The voltage distribution on the distribution line 6 in the distribution system is analyzed with high accuracy using the information and the measured values of the voltage and current of the distribution system as input data. At this time, the operation history information of the PCS 14 includes the time, the amount of electricity (voltage / current) and power factor at the distribution line connection point of the photovoltaic power generation system 60, and the amount of power generation of the photovoltaic power generation system 60. The direction of power flow can be analyzed in the analysis of the voltage distribution on the distribution line 6. Thus, by analyzing the voltage distribution on the distribution line 6 and the tidal current direction, it is possible to appropriately avoid the increase in the system voltage and the suppression of the injection of the power generation amount into the system.

  Further, by recording the operation history information of the PCS 14 input to the distribution system monitoring control device 46 in the database, it can be used for analysis and evaluation of distribution of the system voltage that is performed irregularly. Furthermore, when the operation history information of the PCS 14 is recorded, information on the time when the system voltage exceeds the upper limit or lower limit of the specified value (specified value deviation time information), and information on the time when the generated power of the photovoltaic power generation system 60 is suppressed. By selecting (power suppression time information) or the like, the amount of information recorded in the memory can be reduced.

  Further, when the condition for analyzing the distribution of the system voltage is determined from the recorded operation history information of the PCS 14 and the measured values of the voltage and current of the distribution system, the operation history information at the same time is usually selected. By using the operation history information of the PCS 14 recorded at another time and the operation history information of the PCS 14 interpolating the operation history information recorded when the operation history information of the PCS 14 is missing as an analysis condition, the number of data close to the real system can be obtained. The voltage analysis accuracy is improved due to the increase.

  Further, by downloading the operation history information of the PCS 14 from the installer of the solar power generation system 60 to an e-mail or a specific server, it is possible to easily collect the operation history information of the PCS 14 from the installer. Further, by collecting the operation history information of the PCS 14 via a communication network such as an automatic meter reading owned by the electric power company, the operation history information of the PCS 14 is collected without the intervention of the installer of the solar power generation system 60. Can do. Furthermore, regarding the possibility of collecting the operation history information of the PCS 14, privacy can be protected by adopting a mechanism that requires permission from the installer.

  The embodiment of the distribution system monitoring and control device, the distribution system monitoring and control method, and the photovoltaic power generation system according to the present invention has been specifically described above, but the present invention is not limited to the contents of each embodiment described above. Needless to say, various modifications can be made without departing from the scope of the invention. For example, although the solar power generation system has been described in each of the above embodiments, the present invention is not limited to this, and it goes without saying that the present invention can be applied to a wind power generation system and the like.

  ADVANTAGE OF THE INVENTION According to this invention, it can utilize effectively for the distributed power supply system which connects renewable energy, such as a solar power generation system and a wind power generation system, with distribution systems, such as a commercial power system.

1 Substation 2 Load switching transformer (LRT)
3 Circuit breaker (CB)
4 Substation TC
DESCRIPTION OF SYMBOLS 5 Voltage / current sensor 6 Distribution line 7 Division switch 8 Remote control station 9 Communication line 10 Pole transformer 11 Low voltage distribution line 12 Housing 13 Solar panel 14 Power conditioner (PCS)
15 DC-DC converter 16 Inverter 17 Control unit 18 Timer 19 Memory (storage means)
20 Communication IF (communication interface)
21 Operation History Information 22 IP Network 23 Sales Office 24 Distribution Information Collection Server (Distribution Information Collection Means)
25 Voltage management server (voltage management means)
26 System analysis server (system analysis means)
27 Distributed power management server (distributed power management means)
28 PCS operation status input terminal (power adjustment device operation status input means)
29 LAN
30 Electricity meter (WHM)
31 Power Line 32 Home Appliances 33 Personal Computer 34 Wireless Terminal 35 Automatic Metering Base Station 36 Result Display / Analysis Condition Setting Unit 37 Photovoltaic Power Reversal History Database 38 Distribution System Configuration Database 39 Substation Voltage Current Database 40 Switch Voltage Current Database 41 Distribution system analysis model generation unit 42 Voltage / current distribution analysis unit (voltage / current distribution analysis means)
43 Voltage Control Optimization Unit 44 Voltage Distribution Evaluation Unit 45 Equipment Management Server (Equipment Management Means)
46 Distribution system monitoring and control device 47 PCS information collection server 48 Automatic meter reading server (automatic meter reading means)
49 Public line IP network (communication network)
50 Driving history selection part (Driving history selection means)
60 Solar power generation system 90 Voltage regulator (SVR)

Claims (13)

Distribution information collection means for collecting facility information of a distribution system that supplies power from a substation to consumers and measurement information of the distribution system,
Based on the measurement information and the facility information of the power distribution system, analyze the voltage distribution of the power distribution system, and set the voltage level of the voltage adjustment means of the power distribution system based on a predetermined criterion value Voltage management means for determining the value;
A power conditioner operation status input means for obtaining operation history information of the power conditioner in the solar power generation system connected to the distribution system;
System analysis means for analyzing the voltage distribution of the distribution system using the operation history information acquired by the power conditioner operation status input means;
A distribution system monitoring and control device comprising: The power distribution system includes a distribution line and a section switch connected to the distribution line,
The facility information of the distribution system includes line information of the distribution line and switching information of the section switch,
The voltage adjustment means includes a load-time tap switching transformer of the substation, a voltage regulator installed in the middle of the distribution line, and a pole transformer.
The power distribution system monitoring and control device according to claim 1. The operation history information includes at least the time, the amount of electricity including the voltage, current, and power at the distribution line connection point of the solar power generation system, the power factor, and the power generation amount of the solar power generation system,
The distribution system monitoring and control device according to claim 1, further comprising distributed power source management means having a photovoltaic power generation operation history database that records the operation history information input to the power conditioner operation status input means. .   The distributed power management means includes operation history selection means for selecting only the operation history information in which the amount of electricity or the amount of power generation satisfies a certain condition and recording the selected information in the photovoltaic operation history database. The distribution system monitoring and control device according to claim 3, wherein   The system analysis means comprises voltage / current distribution analysis means for predicting and analyzing the voltage distribution of the distribution line, using either the operation history information or the voltage / current measurement value of the distribution line as a predicted value, The distribution system monitoring and control device according to claim 3.   The distribution system monitoring and control device according to any one of claims 1 to 5, further comprising automatic meter reading means for acquiring the operation history information from the power adjustment device via the Internet.   The automatic meter-reading means which acquires the said driving history information from the said power adjustment apparatus via the communication network connected with the said power adjustment apparatus is further provided, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. Power distribution system monitoring and control equipment. Distribution information collection procedure for collecting facility information of the distribution system that supplies power from the substation to consumers and measurement information of the distribution system,
Based on the measurement information and the facility information of the power distribution system, the voltage distribution of the power distribution system is analyzed, and the voltage level of the voltage adjusting means of the power distribution system is determined based on a predetermined criterion value. A voltage management procedure to determine the settling value;
The power conditioner operation status input procedure for obtaining the operation history information of the power conditioner in the solar power generation system connected to the distribution system,
A system analysis procedure for analyzing the voltage distribution of the distribution system using the operation history information acquired in the power conditioner operation status input procedure;
A distribution system monitoring and control method, characterized in that: The power distribution system includes a distribution line and a section switch connected to the distribution line,
The facility information of the distribution system includes line information of the distribution line and switching information of the section switch,
The voltage adjusting means is a load tap switching transformer of the substation, a voltage regulator installed in the middle of the distribution line, or a pole transformer.
The power distribution system monitoring and control method according to claim 8. The system analysis procedure is as follows:
A first step of generating a distribution system analysis model for analyzing a voltage distribution of the distribution line;
A second step of specifying a specific time;
A third step of collecting measurement information of the distribution system at the specific time;
A fourth step of collecting the driving history information at the specific time;
A fifth step of predicting and analyzing the voltage of the distribution line at the specific time;
A sixth step of determining whether the voltage of the distribution line is within a specified value;
When the voltage of the distribution line is within a specified value, the set value is determined as it is, and when the voltage of the distribution line is not within the specified value, a seventh step of changing the set value When,
The distribution system monitoring and control method according to claim 9, comprising: A solar power generation system comprising a solar panel and a power adjustment device that adjusts the amount of power generated by the solar panel,
The power adjustment device is a storage unit that records operation history information including at least the power generation amount, the amount of electricity including the voltage, current, and power at the connection point between the photovoltaic power generation system and the distribution line, and the time. When,
A communication interface for communicating the operation history information recorded in the storage means to a distribution system monitoring and control device;
A photovoltaic power generation system comprising:   The solar power generation system according to claim 11, further comprising a computer that acquires the operation history information of the power adjustment device by wireless communication and transmits the operation history information to the distribution system monitoring and control device.   The solar light according to claim 11, further comprising a wireless terminal that transmits the operation history information to the distribution system monitoring and control device via an automatic meter-reading device that automatically measures a consumer's electric energy. Power generation system.

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