JP2013093996A - Power supply and demand control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply and demand control apparatus in which power supply to distribution lines is stabilized and a private power generation facility utilizing natural energy can be operated efficiently.SOLUTION: As a power supply and demand control apparatus, a load break switch 100 and a control device 200 are installed in a customer's house where power generated by a private power generation facility 300 utilizing natural energy is transmitted to an in-premise distribution line, supplied to a load L and transmitted to a distribution line of a power company. The load break switch 100 includes natural energy quantity detection means 105 which is scaled smaller than the private power generation facility 300 and measures a strength of natural energy to be utilized by the private power generation facility 300. The control device 200 includes power generation amount detection means 211 which detects the power generation amount of the private power generation facility 300, and control means 213 in which the power generation amount of the private power generation facility 300 is estimated as a predictive power generation amount on the basis of the strength of natural energy measured by the natural energy quantity detection means 105 and the power generation efficiency is determined from the power generation amount of the private power generation facility 300 and the predictive power generation amount.

Description

  The present invention monitors the in-house power generation facility using natural energy provided in the consumer to control the power supply and demand to the consumer, and controls the power factor of the consumer to stabilize the voltage of the power distribution system. The present invention relates to an electric power supply and demand control device.

Many technologies related to power generation using natural energy have been developed from the viewpoint of global environmental conservation. Natural energy power generation includes solar power generation using sunlight and wind power generation using wind power. By providing these as private power generation facilities by consumers, not only self-sufficiency but also surplus power is sold to electric power companies.
When selling electricity, power is supplied from customers to high-voltage overhead distribution lines. However, natural energy generation is greatly affected by the weather and changes instantaneously, so that stable supply is difficult.

  For example, in Patent Literature 1, by controlling the power generation amount and power flow of a distributed power source in each group connected to an AC power source (electric power company) and the load factor of a load group by a control device installed in a consumer. A grid interconnection system is described that can suppress power fluctuations in the system and can reversely flow stable power to the power system corresponding to the amount of power generated by the power generation means, and can supply stable power to consumers. Yes.

JP-A-9-135536

However, in the grid interconnection system described in Patent Document 1, the control device inputs the amount of power generated by the solar cell (distributed power source) from the orthogonal converter, so that the third communication transmission unit to the second information transmission unit. Furthermore, although the power generation amount is transmitted to the first transmission means to the upper level, it cannot be distinguished until the expected power generation amount is not obtained. For example, if it is cloudy, there is no problem because the power generation efficiency is temporary even if it falls, but if the panel surface of the solar cell is dirty or part of the solar cell is broken, Action is required. If left unattended, there is a risk that power generation efficiency will decrease further.
Therefore, it cannot be said that natural energy is effectively utilized if the solar cell is continuously used while the power generation efficiency is still lowered.
In addition, the electric power company adjusts the voltage to maintain the quality of the power supply of the distribution line, but the power supplied to the distribution line from the private power generation is reversed and unstable, and the distribution line is unstable. It is difficult to maintain a constant power quality.

  Then, an object of this invention is to provide the electric power supply-and-demand control apparatus which can operate and operate the private power generation equipment using a distribution line and natural energy efficiently.

  The power supply and demand control apparatus according to the present invention supplies power generated by a private power generation facility using natural energy to a distribution line on the premises and supplies it to a load, and is also installed in a customer who transmits power to the distribution line of an electric power company. It is a supply and demand control device, and a power generation amount detecting means for detecting a power generation amount of the private power generation facility, and a natural energy that is configured to be smaller than the private power generation facility and measures the intensity of the natural energy used by the private power generation facility A power generation amount of the private power generation facility is estimated as a predicted power generation amount based on the amount of natural energy measured by the amount detection means and the natural energy amount detection means, and the private And a control means for determining the power generation efficiency of the power generation facility.

  According to the electric power supply and demand control apparatus of the present invention, the natural energy amount detection means is configured on a smaller scale than the private power generation facility, so that the installation is easy. And from the intensity | strength of the natural energy which the natural energy amount detection means measured, the control means estimates the power generation amount of the private power generation facility as the predicted power generation amount, and the predicted power generation amount and the private power generation facility detected by the power generation amount detection means. Since the control means can determine the power generation efficiency from the power generation amount, the state can be detected if the private power generation facility is not generating the expected power generation amount.

  The control means is configured to install the private power generation equipment to the power generation amount of the private power generation equipment calculated in accordance with the magnitude of the natural energy measured by the natural energy amount detection means corresponding to the size of the private power generation equipment. It is desirable to calculate the predicted power generation amount by multiplying the correction coefficient indicating the power generation rate based on the environment.

  When the control means estimates the power generation amount of the private power generation facility, it is first calculated from the intensity of the natural energy measured by the natural energy amount detection means in accordance with the size of the private power generation facility. However, what is calculated corresponding to the scale of the natural energy amount detection means and the private power generation facility may vary greatly depending on the installation environment of the private power generation facility. Therefore, the control unit can accurately estimate the power generation amount of the private power generation facility by calculating the predicted power generation amount by multiplying the correction coefficient indicating the power generation rate based on the installation environment of the private power generation facility.

As information for controlling the electric power supplied by the electric power company, it is desirable to provide a communication means for transmitting the predicted electric power generation amount estimated as the electric power generation amount of the private power generation facility to a communication network owned by the electric power company.
By transmitting the predicted power generation amount estimated as the power generation amount of the private power generation facility to the communication network owned by the power company, the power company predicts the voltage increase of the power system from the power generation amount of this consumer, Control that suppresses voltage rise can be performed in an automatic voltage regulator or a reactor of the power system.

  When the natural energy amount detection means is arranged at a load switch installed at the customer's service entrance, it will be installed at a position higher than the ground, so the influence of the surroundings, such as the shadow of the building, etc. It is hard to receive. Therefore, the intensity of natural energy can be accurately measured.

  Further, when the natural energy amount detecting means is disposed in a control device that controls the introduction or release of the high-voltage distribution line by a load switch installed at the customer's service entrance, it is installed at a height close to the ground. Therefore, maintenance is easy.

  A plurality of the natural energy amount detection means are provided around the private power generation facility, and the control means calculates the predicted power generation amount based on a temporal change in the intensity of the natural energy from the plurality of natural energy amount detection means. It is better to calculate. In this case, the power generation amount of the private power generation facility can be predicted from the temporal change in the intensity of the plurality of natural energy from the natural energy amount detection means.

The control means has a function of transmitting the power factor obtained from the voltage and current detected from the distribution line on the premises to the electric power company via the communication means, and the control means via the communication means. It is desirable to control the connection of the phase advance capacitor based on the control signal received from the electric power company.
The power company can control the connection of the phase-advancing capacitor based on the power factor received via the communication device, and the power factor can be controlled on a per-customer basis. Lead to stabilization.

In the present invention, if the control means monitors the power generation amount of the private power generation and judges the power generation efficiency compared with the natural energy amount detection means, if the private power generation facility does not generate the expected power generation amount, Since the state can be detected, maintenance inspection when confirming the operating state of the private power generation facility is easy, and the private power generation facility using natural energy can be operated efficiently.
Further, according to the present invention, the electric power company predicts the power state of the distribution line in time and prepares for adjustment by grasping the change in the amount of private power generation on each customer side and the power factor of the consumer by the communication means. It is possible to keep the supplied power in an appropriate quality state.

It is a figure for demonstrating the remote monitoring control system and electric power distribution line of an electric power company. It is a figure for demonstrating the structure of each installation arrange | positioned at a high voltage | pressure consumer. It is a figure which shows the state which installed the natural energy amount detection means in the load switch. It is a figure which shows the state which installed the natural energy amount detection means in the control apparatus which controls a load switch. It is a flowchart for demonstrating operation | movement of the control means of a control apparatus. It is a flowchart for demonstrating operation | movement of the communication control means of a power factor improvement apparatus. It is a figure which shows the state which has arrange | positioned the natural energy amount detection means around the natural energy power generation device.

(Embodiment 1)
A power supply and demand control apparatus according to Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, power is distributed to each high-voltage consumer (hereinafter simply referred to as “customer”) from distribution substations A and B through distribution lines L1 and L2 on the power system side. A switch S1 with a built-in sensor for monitoring voltage and current is installed in the distribution line L1 of the distribution substation A and the distribution line L2 of the distribution substation B, respectively. In the distribution line L1, a self-supporting distributed distribution line voltage regulator (SCC), a reactor, and the like are installed. An automatic voltage regulator (SVR) or the like is installed on the distribution line L2. At the end of the distribution line L1 and the distribution line L2, a normally open switch S2 that is open in a steady operation state is installed.

  A remote control (distant monitoring control) slave station N1 is connected to the sensor built-in switch S1 and the normally open switch S2. The remote control station N1 uses the information from the sensor built-in switch S1 and the normally open switch S2 via the distribution line distance control communication line W, Internet protocol communication using an optical network, or a metal cable. By pulse code communication, transmission to the remote control station N2 provided in the power office, reception of opening / closing instructions from the remote control station N2 to the sensor built-in switch S1 and the normally open switch S2, Receives control instructions and reactor connection instructions to the distributed distribution line voltage regulator. Further, the remote control station N1 has a communication function with a control device installed in the consumer.

Here, the structure of a consumer is demonstrated based on FIG.
For the consumer, a load switch 100 disposed at the service entrance of the consumer that is a demarcation point of responsibility with the power system, a control device 200 that controls the loading or opening of the high-voltage distribution line by the load switch 100, And a power factor correction device 400 arranged at a substation in a consumer. Further, in order to cover the power to the load (customer load) L, the consumer is provided with not only power supply from the electric power company but also a private power generation facility 300. The power supply / demand control apparatus according to the embodiment of the present invention can be configured by the load switch 100, the control apparatus 200, and the power factor correction apparatus 400.

  First, the configuration of the load switch 100 will be described. The load switch 100 includes an opening / closing means 101, a zero phase current detection means 102, a load current detection means 103, a zero phase voltage / interphase voltage detection means 104, and a natural energy amount detection means 105.

  The opening / closing means 101 is used to open the lead-in distribution lines for each phase of R, S, and T, or to be manually turned on by releasing the overcurrent occurrence accident state. The zero-phase current detection means 102 is a zero-phase current transformer (ZCT) that detects a zero-phase current that flows when a ground fault occurs. The load current detection means 103 is an overcurrent lock relay (OCR) that detects a load current flowing through the lead-in distribution line. The zero-phase voltage / interphase voltage detection means 104 is a zero-phase voltage detector (ZPD) that detects a zero-phase voltage and a device transformer (PD) that detects an inter-phase voltage.

  The natural energy amount detection means 105 is a solar power generation panel or a solar meter that is smaller than the solar power generation panel installed as the private power generation facility 300 if the private power generation facility 300 generates solar power. If the natural energy amount detection means 105 is a small-scale photovoltaic power generation panel, the detected natural energy intensity is a current signal of the generated current. If the natural energy amount detection means 105 is a pyranometer, the natural energy intensity is digital data indicating the intensity of sunlight. The natural energy amount detection means 105 is a wind power generator, an anemometer, or an anemometer that is smaller than the wind power generator installed as the private power generation facility 300 if the private power generation facility 300 generates wind power. If the natural energy amount detection means 105 is an anemometer, the intensity of natural energy is digital data indicating wind power, and if the natural energy amount detection means 105 is an anemometer, the intensity of natural energy is digital data indicating wind speed. is there.

  If the natural energy amount detection means 105 is a photovoltaic power generation panel, it can be disposed in the load switch 100 or the control device 200. Further, if the natural energy amount detection means 105 is a wind power generator, an anemometer, or an anemometer, it is desirable to provide a stand with a column higher than the top surface of the load switch 100.

Here, an installation example when the natural energy amount detection means 105 is a solar power generation panel will be described based on the drawings.
In FIG. 3, the natural energy amount detection means 105 is provided in the load switch 100. Since the load switch 100 is normally provided at a high position of the power pole P, the natural energy amount detection means 105 is provided with light by other objects when the natural energy amount detection means 105 is provided in the load switch 100. Is not obstructed and is not easily shadowed by other objects. Therefore, the influence of the shadow on the natural energy amount detection means 105 can be reduced.
In FIG. 4, the natural energy amount detection means 105 is provided in the control device 200. Since the control device 200 is normally installed at a position relatively close to the ground, the natural energy amount detection means 105 is provided in the control device 200, so that maintenance of the natural energy amount detection means 105 is performed. Can be carried out without the use of special equipment for working at heights. The installation location of the natural energy amount detection means 105 can be selected according to the surrounding environment.

  Next, the configuration of the control device 200 will be described with reference to FIG. The control device 200 includes a zero phase current conversion means 201, a switch trip means 202, a load current conversion means 203, a zero phase voltage / interphase voltage conversion means 204, an energy amount conversion means 205, a calendar means 206, A storage unit 207, a communication unit 208, a control power source unit 209, an alarm contact unit 210, a power generation amount detection unit 211, a setting unit 212, and a control unit 213 are provided.

The zero-phase current conversion unit 201 converts a current signal indicating the amount of zero-phase current from the zero-phase current detection unit 102 into a voltage signal and also converts an analog signal into a digital signal. The switch trip means 202 converts a signal instructing release from the control means 213 as a voltage signal. The load current conversion unit 203 converts a current signal indicating the load current amount of the load current detection unit 103 into a voltage signal and also converts an analog signal into a digital signal. The zero phase voltage / interphase voltage conversion means 204 converts a voltage signal indicating the zero phase voltage from the zero phase voltage / phase voltage and a voltage signal indicating the phase voltage into a digital signal.
The energy amount conversion unit 205 is required to convert the current signal into a digital signal when the signal indicating the intensity of the natural energy from the natural energy amount detection unit 105 is a current signal. Therefore, when the signal from the natural energy amount detection means 105 is a digital signal, it can be omitted. The calendar means 206 clocks the date, time, and day of the week.

  The storage unit 207 stores setting data set by the setting unit 212. The storage means 207 includes, as main setting data, ground fault operating voltage setting data, ground fault operating current setting data, ground fault operating time setting data, rated power generation setting data, conversion setting data, and correction coefficient. Setting data and identification code setting data are stored.

  The ground fault operating voltage setting data is a voltage value for determining the occurrence of a ground fault. The ground fault operating current setting data is a set value of a zero-phase current for determining the occurrence of a ground fault. The ground fault operation time setting data is a detection time set value when a ground fault occurs. The correction coefficient setting data is a correction value indicating a correction value for the rated generated power of the natural energy power generation device of the private power generation facility 300. The conversion setting data is a value for converting the power generation amount of the private power generation facility 300 from the power generation amount by the natural energy amount detection means 105. The identification code setting data is an ID for identifying a customer when communicating with an electric power company.

  The communication unit 208 has a function of transmitting transmission data from the control unit 213 to the remote control station N1 or the concentrator N3 and transmitting reception data from the remote control station N1 to the control unit 213. Communication between the communication means 208 and the remote control station N1 or the concentrator N3 may be either wireless communication or wired communication. As for the procedure, a conventional communication method can be adopted.

  The control power supply means 209 supplies power to each circuit block (each means) in the control device 200 by supplying power from a substation installed in the consumer or by a control power transformer built in the load switch 100. And a function as a communication device that modulates communication data from the control means 213 and transmits the data to the power factor control device 400 in the customer substation by power line communication.

The alarm contact unit 210 is a contact interface based on an output from the control unit 213.
The power generation amount detection means 211 has a function of detecting and outputting the power generation amount of the private power generation facility 300 using natural energy.
The setting unit 212 has a function of setting setting data indicating various conditions of the control method of the control device 200 in advance by the operation of the administrator. This setting includes setting of ground fault operating voltage, ground fault operating current, ground fault operating time, rated power generation amount, power generation amount conversion coefficient, identification code, output correction coefficient, etc. Each data is stored in the storage means 207. The
The control means 213 performs overall control of the entire control device 200, and functions as a processing device having an arithmetic function and a determination function.

Next, the private power generation equipment 300 installed in the consumer will be described.
The private power generation facility 300 includes a natural energy power generation device 301, a power conditioner 302, and a transformer 303.
The natural energy power generation device 301 is a device that generates power using natural energy, and can be a solar power generation panel for solar power generation or a wind power generator for wind power generation. The natural energy power generation apparatus 301 is composed of a plurality of units in order to obtain a large output. The power conditioner 302 has a function of integrating outputs from the plurality of natural energy power generation devices 301 into one system and converting the output into an AC voltage. The transformer 303 boosts the voltage to transmit power to the incoming distribution line.

  Next, the power factor improvement apparatus 400 installed in the substation in a consumer is demonstrated. The power factor correction apparatus 400 includes a phase advance capacitor 401, a communication control unit 402 that communicates with the control device 200, and a signal that controls connection and disconnection between the phase advance capacitor 401 and the incoming distribution line according to an instruction from the communication control unit 402. Capacitor connection driving means 403 for driving, and capacitor connection means 404 constituted by a switch for connecting or disconnecting the phase advance capacitor 401 to the incoming distribution line by a signal from the output means 403 are provided. The communication control means 402 stores an identification code for determining whether or not it is the own device when communicating.

  A control method of the control device 200 and the power factor correction device 400 in the consumer configured as described above will be described with reference to the drawings. First, the operation of the control means 213 of the control device 200 will be described. In addition, the natural energy power generation apparatus 301 and the natural energy amount detection means 105 of the private power generation facility 300 are solar power generation panels.

As shown in FIG. 5, the control means 213 detects and measures the zero-phase current by the zero-phase current detection means 102 and the zero-phase current conversion means 201. Further, the control means 213 detects and measures the zero phase voltage by the zero phase voltage / interphase voltage detection means 104 and the zero phase voltage / interphase voltage conversion means 204 (step S10).
The control means 213 includes the measured zero-phase current and zero-phase voltage, ground fault operating current setting data and ground fault operating voltage setting data, which are setting data stored in the storage means 207, zero phase current and zero phase voltage. It is determined whether or not a ground fault has occurred in the customer premises based on the tidal direction detected from the phase difference (step S20).
If it is determined in step S20 that a ground fault has occurred, the process proceeds from step S30 to step S40. If it is determined that no ground fault has occurred, the process proceeds to step S50.

When it is determined in step S30 that a ground fault has occurred in the customer premises, the control unit 213 determines a predetermined ground fault detection time based on the ground fault operation time setting data stored in the storage unit 207. (Step S40). If the ground fault current is detected until the ground fault detection time elapses, the control means 213 opens the switching means 101 by outputting a signal (trip output valid) instructing release to the switch trip means 202. (Step S60).
The control unit 213 identifies the customer stored in the storage unit 207 using the date / time data read from the calendar unit 206 as the accident occurrence date / time data and the zero-phase current and zero-phase voltage at this time as the accident occurrence information. The identification code setting data is attached and transmitted to the remote control station N1 or the concentrator N3 via the communication means 208, and the process proceeds to step S50 (step S70).

When it is determined in step S30 that the ground fault has not occurred, the control unit 213 measures the load current using the load current detection unit 103 and the load current conversion unit 203. Further, the control means 213 measures the interphase voltage by the zero phase voltage / interphase voltage detection means 104 and the zero phase voltage / interphase voltage conversion means 204. Further, the control means 213 measures the power factor from the load current and the interphase voltage (step S50).
Then, the control means 213 transmits the date / time data read from the calendar means 206 as measurement date / time data, and transmits the load current and interphase voltage as measurement data to the remote control station N1 or the concentrator N3 via the communication means 208 (step S80). ).

Next, the control unit 213 inputs the intensity of the natural energy from the natural energy amount detection unit 105 from the energy amount conversion unit 205 to measure the amount of power generated by the natural energy amount detection unit 105 (step S90).
The control means 213 estimates the power generation amount of the private power generation facility 300 from the power generation amount of the natural energy amount detection means 105 measured in step S90 (step S100).

Here, the estimation of the power generation amount of the private power generation facility 300 by the control means 213 will be described in detail.
First, in order to make the power generation amount (natural energy intensity) of the natural energy amount detection means 105 correspond to the size of the private power generation facility 300, the conversion setting data is converted into the power generation amount obtained from the natural energy amount detection means 105. By multiplying, the power generation amount of a large-scale solar power generation panel installed in the private power generation facility 300 is calculated.
For example, if the rated output of a small-scale photovoltaic power generation panel installed as the natural energy amount detection means 105 is 10 W and the power generation amount of the private power generation facility 300 is 10 kW, the power generation measured by the natural energy amount detection means 105 1000 times the amount is the power generation amount of the private power generation facility 300.

  In addition, a small-scale photovoltaic power generation panel installed as the natural energy amount detection unit 105 has an output value that decreases depending on the installation environment such as the installation angle and the installation direction even if the rated output is 10 W, for example. Sometimes. Therefore, if the reduction rate is 80%, if the power generation amount obtained from the natural energy amount detection means 105 is 5 W, it should be 6.25 W during rated power generation.

  Therefore, by multiplying the power generation amount obtained by the natural energy amount detection means 105 using 1 ÷ 0.8 × 1000 = 1250 as conversion setting data, the power generation amount of the natural energy amount detection means 105 is multiplied by that of the private power generation facility 300. It can be converted into power generation.

However, the output value of a large-scale solar power generation panel installed as the private power generation facility 300 also varies depending on the installation environment such as the installation angle and the installation direction. The rated output of the large-scale photovoltaic power generation panel is set in the storage means 207 as the correction coefficient setting data as the power generation rate based on the installation environment, that is, the rate (%) at which the photovoltaic power generation panel decreases depending on the installation environment. By multiplying the converted power generation amount of the private power generation facility 300 by this correction coefficient setting data, the power generation amount of the private power generation facility 300 can be estimated as the predicted power generation amount. For example, if the correction coefficient setting data has a reduction rate of 70%, the power generation amount of the private power generation facility 300 can be calculated by multiplying the converted power generation amount of the private power generation facility 300 by 0.7.
The control unit 213 stores the predicted power generation amount thus obtained in the storage unit 207 as private power generation estimation data.

Next, the control means 213 determines whether or not the predicted power generation leveling process has been completed (step S110). This is because the amount of power generation using natural energy also changes in response to the natural environment changing from moment to moment, so instead of sequentially transmitting the predicted power generation amount to the power company, it takes an integral or average over a certain period of time, This is transmitted as the predicted power generation amount. Therefore, if it is determined in step S110 that the predicted power generation leveling process has not been completed, the leveling process is performed (step S120).
If the leveling process has been completed, the control unit 213 sends the date / time data indicating the measurement date / time and the predicted power generation amount after the leveling process to the remote control station N1 or the concentrator via the communication unit 208. Transmit to N3 (step S130).

Next, the control unit 213 inputs a signal from the power generation amount detection unit 211 and measures the power generation amount of the natural energy power generation apparatus 301 (step S140). Next, the control means 213 determines whether or not the leveling process of the measured power generation amount of the natural energy power generation apparatus 301 has been completed (step S150). If it is determined in step S150 that the leveling process of the private power generation estimation data has not been completed, the leveling process is performed (step S160).
If the leveling process is completed, the control unit 213 uses the communication unit 208 to transmit the date and time data indicating the date and time of measurement and the power generation amount of the natural energy power generation apparatus 301 after the leveling process to the remote control station. It transmits to N1 or the concentrator N3 (step S170).

Then, the control unit 213 determines whether or not the absolute value of the difference between the predicted power generation amount after the leveling process and the power generation amount of the leveled natural energy power generation apparatus 301 is within a predetermined value. Is inspected (step S180).
When the result determined in step S180 is within the predetermined value, the control means 213 proceeds to step S200 because the expected power generation is obtained from the private power generation facility 300.

  Further, when the result determined in step S180 is smaller than the predetermined value, it indicates that the power generation efficiency is deteriorated. Therefore, the control means 213 turns on the contact of the alarm contact means 210, and the alarm contact means 210 The administrator is notified by a notifying means (not shown) connected to (step S190).

Next, when the communication means 213 receives communication data from the power company via the communication means 208, the control means 213 determines whether or not this communication data is an instruction for phase advance capacitor control (step S200).
If it is determined in step S200 that the communication data from the power company is an instruction for phase advance capacitor control, the control means 213 transmits the communication data from the power company to the power factor correction apparatus 400 (step S200). S210). If it is determined in step S210 that the communication data is not an instruction for phase-advance capacitor control, the process ends without doing anything.
The control means 213 repeatedly executes such processing from step S10 to step S210.

Next, the operation of the communication control unit 402 of the power factor correction apparatus 400 will be described based on the drawings.
As shown in FIG. 6, the communication control unit 402 first determines whether or not the communication from the control unit 213 is addressed to its own device, and if it is determined that it is the own device, the process proceeds to step S310. If it is not its own device, the control is terminated (step S300).
If it is determined in step S300 that the communication from the control means 213 is addressed to the own device, the communication data from the power company is a connection valid instruction indicating that the connection of the phase advance capacitor 401 is valid. If NO in step S320, the flow advances to step S320. If not, the flow advances to step S330 (step S310).
If it is determined in step S310 that the connection is valid, the communication control unit 402 outputs a connection instruction for the phase advance capacitor 401 to the capacitor connection drive unit 403 (step S320). By doing so, the capacitor connection drive means 403 drives the capacitor connection means 404 to connect the phase advance capacitor 401 to the incoming distribution line. By connecting the phase advance capacitor 401 to the lead-in distribution line, it is possible to improve the power factor by canceling the delayed phase with the advanced phase.

Next, the communication control unit 402 determines whether or not the communication data from the power company is a connection invalidation instruction that invalidates the connection of the phase advance capacitor 401. If the communication data is a connection invalidation instruction, the process proceeds to step S340. If there is no connection invalidation instruction, the process proceeds to step S350 (step S330).
If it is determined in step S330 that the connection is instructed, the communication control unit 402 outputs an instruction to disconnect the phase advance capacitor 401 to the capacitor connection driving unit 403 (step S340). By doing so, the capacitor connection drive means 403 drives the capacitor connection means 404 to disconnect the phase advance capacitor 401 from the incoming distribution line. By disconnecting the phase advance capacitor 401 from the lead-in distribution line, it is possible to suppress the voltage of the lead-in distribution line having a high voltage and a leading power factor with respect to the voltage of the power distribution line.

Next, the communication control means 402 determines whether or not the communication data from the electric power company is an instruction for autonomous control, and if it is an instruction for autonomous control, the process proceeds to step S360, and ends if it is not an instruction for autonomous control ( Step S350).
If it is determined in step S350 that the instruction is autonomous control, the communication control unit 402 determines whether or not the target value control is performed. If the target value control is performed, the process proceeds to step S370. If not, the process proceeds to step S380 (step S360).

  If it is determined that the target value control is performed in step S360, the communication control unit 402 executes the target value control (step S370). The target value control refers to the power distribution line notified from the control device 200 based on the target power factor notified in advance to the communication control means 402 of the power factor improvement device 400 via the control device 200 from the power company. This control method autonomously improves the power factor by controlling connection / disconnection of the phase advance capacitor 401 based on the power factor.

  If it is determined in step S360 that the instruction is not an instruction for target value control, the communication control unit 402 determines whether or not it is schedule control. If it is schedule control, the process proceeds to step S390, and if it is not schedule control. The process proceeds to step S400 (step S380).

  If it is determined in step S380 that the schedule control is performed, the communication control unit 402 executes the schedule control (step S390). The schedule control is an autonomous power factor by controlling connection / disconnection of the phase advance capacitor 401 in accordance with a schedule notified in advance to the communication control means 402 of the power factor correction apparatus 400 from the power company via the control apparatus 200. This is a control method for improving the above. In the schedule control, for example, the connection / disconnection of the phase advance capacitor 401 can be planned according to the day of the week in units of one week. For management of the day of the week at this time, a calendar unit may be provided in the communication control unit 402, or day-of-week data from the calendar unit 206 of the control device 200 can be taken in and used.

When it is determined in step S380 that the schedule control is not performed, the communication control unit 402 executes timer control (step S400). The timer control is autonomous by controlling connection / disconnection of the phase-advancing capacitor 401 in accordance with the schedule of one day notified in advance to the communication control unit 402 of the power factor correction apparatus 400 via the control apparatus 200 from the electric power company. This is a control method for improving the power factor. For example, the timer control can be planned such that the phase advance capacitor 401 is connected at 8:00 am and the phase advance capacitor 401 is disconnected at 7:00 pm. For management of the time at this time, a calendar means may be provided in the communication control means 402, or day-of-week data from the calendar means 206 of the control device 200 can be taken in and used.
The communication control unit 402 repeatedly executes such processing from step S300 to step S400.

  In this way, the control unit 213 estimates the power generation amount of the private power generation facility 300 as the predicted power generation amount, and the power generation efficiency is calculated from the predicted power generation amount and the power generation amount of the private power generation facility detected by the power generation amount detection unit 211. Therefore, if the private power generation facility 300 does not generate the expected power generation amount, the state can be detected. Therefore, the private power generation facility 300 using natural energy can be operated efficiently.

  Further, when determining the power generation efficiency, the control unit 213 calculates the predicted power generation amount by multiplying the correction coefficient obtained from the actual power generation amount corresponding to the installation environment with respect to the rated power generation amount of the private power generation facility 300. It is possible to accurately estimate the power generation amount of the private power generation facility.

  Further, since the power generation amount of the private power generation facility 300 is transmitted from the consumer to the power company, the power company predicts a voltage increase of the power system from the power generation amount of the consumer, and the remote control station N2 Control that suppresses the voltage rise can be transmitted to the station N1 to an automatic voltage regulator or a reactor of the power system.

  Furthermore, the control means 213 transmits the power factor detected in step S80 to the electric power company via the communication means 208, thereby connecting the phase advance capacitor 401 based on the control signal transmitted from the electric power company. Since it controls, a power factor can be controlled per customer.

(Embodiment 2)
Next, a power supply and demand apparatus according to Embodiment 2 of the present invention will be described based on the drawings. In FIG. 7, the same components as those in FIG. Further, as the control device 300, only the energy amount conversion means 205 and the control means 213 are illustrated.

  As shown in FIG. 7, a large-scale solar power generation panel is installed as the natural energy power generation apparatus 301 of the private power generation facility 300, and small-scale solar power generation panels C <b> 1 to C <b> 4 are used as the natural energy amount detection means 105 around it. is set up. In the present embodiment, the photovoltaic power generation panels C1 to C4 are installed at four locations that are corners of the rectangular natural energy power generation apparatus 301.

  Thus, by arrange | positioning the natural energy amount detection means 105 (solar power generation panel C1-C4), the intensity | strength of natural energy can be measured as a power generation amount from several solar power generation panel C1-C4. And the power generation amount of the private power generation facility 300 can be predicted from the temporal transition of the power generation amount of each of the solar power generation panels C1 to C4.

For example, if the power generation amount of the solar power generation panels C1 and C2 gradually decreases and the power generation amount of the solar power generation panels C3 and C4 does not change, the clouds move from the solar power generation panels C1 and C2 side. Can be predicted. Therefore, the amount of power generated by the natural energy power generation apparatus 301 (large-scale photovoltaic power generation panel) is the amount of power generated by the photovoltaic power generation panels C1 and C2 when the power generation amount of the photovoltaic power generation panels C1 and C2 starts to gradually decrease. It can be predicted that the amount decreases according to the rate of decrease in the amount. And since the power generation amount of the natural energy power generation device 301 is decreased and the power generation amount of the photovoltaic power generation panels C3 and C4 is further decreased, the cause of the decrease in the power generation amount is not a dirt or a failure but a movement of clouds. I can confirm that.
By such a procedure, the control unit 213 can predict the power generation amount of the natural energy power generation apparatus 301 from the power generation amounts of the plurality of solar power generation panels C1 to C4 arranged around the natural energy power generation apparatus 301.

In the second embodiment, the natural energy amount detection means 105 has been described by taking a photovoltaic power generation panel as an example, but the power generation amount can be similarly predicted by using an illuminometer. The same applies to the case where the natural energy power generation apparatus 301 is wind power generation.
Moreover, in this Embodiment 2, although the photovoltaic power generation panels C1-C4 are installed in four places used as the corner | angular part of the rectangular natural energy power generation apparatus 301, it respond | corresponds to the corner | angular part which opposes a photovoltaic power generation panel. You may install in two places corresponding to two places or opposite sides. In addition, when a photovoltaic power generation panel is installed long horizontally, a photovoltaic power generation panel that functions as a natural energy amount detection means 105 is provided above and below the middle portion in the longitudinal direction in order to increase the prediction accuracy of the power generation amount. May be added.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said Example. For example, in the present embodiment, the power supply and demand device is applied to the load switch 100 disposed at the customer's service entrance and the control device 200 that controls the load switch 100, but may be a separate device. Moreover, since the power factor improvement apparatus 400 is provided in the customer's substation, it is connected to the control apparatus 300 via the power line, but may be configured to be directly connected to the control apparatus 300.

  The present invention is suitable for high-voltage consumers who have stable power supply to power distribution lines of electric power companies and own power generation facilities.

DESCRIPTION OF SYMBOLS 100 Load switch 101 Switching means 102 Zero phase current detection means 103 Load current detection means 104 Zero phase voltage / interphase voltage detection means 105 Natural energy amount detection means 200 Controller 201 Zero phase current conversion means 202 Switch trip means 203 Load current Conversion means 204 Zero phase voltage / interphase voltage conversion means 205 Energy amount conversion means 206 Calendar means 207 Storage means 208 Communication means 209 Control power supply means 210 Alarm contact means 211 Power generation amount detection means 212 Setting means 213 Control means 300 Private power generation equipment 301 Natural Energy generator 302 Power conditioner 303 Transformer 400 Power factor correction device 401 Phase advance capacitor 402 Communication control means 403 Capacitor connection drive means 404 Capacitor connection means A, B Distribution substation N1 Distant Control station N2 Remote control station N3 Concentrator L Load S1 Sensor built-in switch S2 Normally open switch L1, L2 Distribution line W Distribution line Distance control communication line P Post

Claims (7)

A power supply and demand control device installed in a customer who transmits the power generated by a private power generation facility using natural energy to a distribution line on the premises and supplies it to the load, and also transmits to the distribution line of the power company,
A power generation amount detecting means for detecting a power generation amount of the private power generation facility;
Natural energy amount detection means configured to be smaller than the private power generation facility and measure the intensity of natural energy used by the private power generation facility,
Based on the intensity of natural energy measured by the natural energy amount detection means, the power generation amount of the private power generation facility is estimated as a predicted power generation amount, and the power generation efficiency of the private power generation facility is calculated from the power generation amount of the private power generation facility and the predicted power generation amount. And a power supply / demand control apparatus comprising: a control means for determining   The control means is configured to install the private power generation equipment to the power generation amount of the private power generation equipment calculated in accordance with the magnitude of the natural energy measured by the natural energy amount detection means corresponding to the size of the private power generation equipment. The power supply and demand control apparatus according to claim 1, wherein the predicted power generation amount is calculated by multiplying a correction coefficient indicating a power generation rate based on the environment.   The communication means which transmits the estimated electric power generation estimated as the electric power generation amount of the said private power generation equipment to the communication network which the said electric power company owns as information for controlling the electric power which the said electric power company supplies. The power supply and demand control device described.   The said natural energy amount detection means is an electric power supply-and-demand control apparatus of any one of Claim 1 to 3 arrange | positioned at the load switch installed in the inlet of the said consumer.   The said natural energy amount detection means is arrange | positioned at the control apparatus which controls the injection | throwing-in or open | release of a high voltage distribution line by the load switch installed in the said customer's service entrance. The power supply and demand control device described. A plurality of the natural energy amount detection means are provided around the private power generation facility,
The power supply / demand control apparatus according to any one of claims 1 to 3, wherein the control unit calculates a predicted power generation amount based on a temporal change in the intensity of natural energy from the plurality of natural energy amount detection units. . The control means has a function of transmitting the power factor obtained from the voltage and current detected from the distribution line on the premises to the power company via the communication means,
The power supply / demand control apparatus according to any one of claims 1 to 6, wherein the control means controls connection of a phase advance capacitor based on a control signal from the electric power company received via the communication means.

Images