JP5928014B2 - Supply / demand control system, supply / demand control method, and supply / demand control program - Google Patents

Description

  The present invention relates to a supply and demand control system, a supply and demand control method, and a supply and demand control program for controlling system power to a customer connected to a transmission line.

  In recent years, expectations for natural energy such as solar power generation are increasing due to the growing awareness of energy security. In addition to large-scale power generators operated by electric utilities, the importance of small-scale generators that use natural energy as an energy supply means is increasing. On the electric power consumer side, the introduction of natural energy is being promoted as a distributed power source. In such a consumer, when the amount of power generated by natural energy increases due to natural conditions or the like, a reverse power flow is performed to connect the power grid and supply surplus power.

  A distributed power source using such natural energy is connected to a distribution board in a consumer via a power conditioner. The generated power is made available by setting the generated electricity to an appropriate voltage and frequency by a power conditioner.

  In the electric power system, a power supply generating and supplying electric power company has a central power supply command station, and a microgrid has a mechanism for controlling output of a generator such as a supply and demand controller (hereinafter referred to as a generator control mechanism). Is required).

  A generator using natural energy supplies a relatively small power output. However, a temporal fluctuation is large due to weather changes and the power output to be supplied is not stable for a long time.

  For this reason, it is necessary to construct a power supply and demand system so that a generator using natural energy complements a large-scale power generation device and supply power, and can stably respond to power demand from customers.

  On the other hand, the power demand from consumers fluctuates in time according to the lifestyle and behavior of the user.

  That is, on the customer side, there is an increasing need to respond to the supplied power output by changing the power demand value.

  The generator control mechanism plays a role in balancing power supply and demand in the system. If the balance between power supply and demand is lost, the frequency value of AC power will fluctuate. In order to maintain a certain range (hereinafter referred to as the rated frequency) from the standard frequency (hereinafter referred to as the standard frequency), the generator control mechanism in the system is designed to prevent such a property. Adjust the output.

  When a large number of distributed power sources connected to the power system are introduced in a situation where the number of customers who introduce distributed power sources increases, the power supply amount may become excessive depending on conditions. For example, during the period of large holidays in early spring, while the demand for power decreases, the amount of power generated by natural energy increases. In such a situation, there is a risk of excessive supply of power.

  For this reason, there is an increasing need for power supply and demand control by suppressing output of distributed power sources and creating power demand.

  There are storage energy-type load devices such as storage batteries and heat pump water heaters that are expected to be effective in creating electricity demand. These load devices convert supplied electric power into chemical energy and change it as a change in the state of a substance, or convert it into heat energy and store it as a change in the temperature of a medium such as water.

  At present, these load devices are operated according to the operation schedule created based on the supply and demand forecast for each customer. The effect of creating demand in the time zone required in the power system is expected by appropriately shifting the operating time of these load devices. If the shift in operating time is not consistent with the demand pattern of the consumer, it will be disadvantageous to the consumer, but this disadvantage is not significant.

  Thus, it is desirable to avoid supply and demand control by the consumer. Therefore, such supply and demand control needs to be taken into consideration, for example, by limiting the time period. In addition, in order to implement the power supply / demand control described above in the power system, it is necessary to develop a communication network that transmits a supply / demand control notification from the generator control mechanism to each consumer.

  Such a communication network is a large-scale transmission network that connects the generator control mechanism and each consumer, and enormous costs and time are required to construct and construct a new network. For this reason, it is preferable to use an existing power transmission line for transmission of the supply and demand control notification.

  Patent Document 1 communicates frequency fluctuations that occur when power supply and power demand are imbalanced to a consumer and adjusts load equipment in the consumer, thereby keeping the frequency of the system power within the rated frequency. Disclosed are a frequency control device and a system frequency control method.

  In the frequency control technique disclosed in Patent Document 1, in the power system, the generator control device on the power supply side performs output control on each generator in order to cope with temporal changes in power demand. .

  On the other hand, if there is a reverse power supply flow by a small generator on the customer side, the generator adjustment mechanism on the power supply side exceeds the adjustable range, and the supply is excessive. May be. At this time, the frequency of the system power becomes higher than the rated frequency. On the other hand, if the supply is less, the frequency will be lower. Thus, the frequency fluctuation can be used as information indicating the supply and demand situation.

  In the frequency control method disclosed in Patent Literature 1, when an excessive supply of electric power is detected due to a frequency fluctuation, a load on the consumer side is notified by notifying the consumer so that the excess supply power is consumed on the consumer side. Activate the equipment. Alternatively, when power is generated by a small-scale generator on the consumer side, when an excessive supply of power is detected on the consumer side, the load device is operated to consume surplus power.

  Patent Document 2 discloses an information transmission device that transmits information by displacing the frequency of a supplied alternating current in a non-contact power feeding device of a moving body.

JP 2006-042458 A JP-A-7-61350

  However, there may be a problem in control if the fluctuation of the frequency derived from the power supply / demand situation is directly replaced with the supply / demand control notification information to the consumer. For example, let us consider a case in which some consumers operate a load device in response to a change in the supply and demand situation, and the demand amount and the supply amount are balanced. At this time, the frequency of the system power changes within a desirable range. For this reason, other consumers cannot judge whether the stable supply-demand balance is brought about by the consumer supply-demand control.

  As described above, when detecting a change in frequency on the consumer side, a difference in response to the frequency change occurs between the consumers, and each consumer-side load device cannot be used efficiently.

  In addition, the communication means disclosed in Patent Document 1 needs to provide a communication path that is separate from the power supply network and a communication means on each consumer side, which raises the cost of the entire supply and demand system.

  The information transmission device disclosed in Patent Document 2 displaces the frequency of the alternating current supplied by the non-contact power feeding device of the moving body. The mobile body disclosed in Patent Document 2 is not limited with respect to frequency fluctuations because the supplied AC power is rectified and converted into DC. On the other hand, in the frequency control method disclosed in Patent Document 1, since the frequency of supplied power is controlled to be the rated frequency, information is transmitted through a communication network separately from the power supply network. For this reason, the information transmission method of patent document 2 cannot be combined with the frequency control method of patent document 1.

  The present invention has been made in view of the above points, and the upper system intentionally changes the frequency of the system power and notifies the lower system through the communication path using the existing power transmission line, and the consumer power An object of the present invention is to provide a supply and demand control system and a supply and demand control method that indicate whether or not control is necessary.

  To achieve the above object, a power supply and demand control system according to the present invention includes a generator and a high-order system having a generator control unit for controlling the generator, and a low-order system having a load device, and a generator control unit Is characterized by controlling the supply and demand of electric power by changing the frequency of electric power generated by the generator.

  Further, the supply and demand control method of the present invention is a power supply and demand control method including an upper system having a generator for generating electric power and a lower system having a load device, the step of changing the frequency of the electric power, And detecting the change of power and controlling the supply and demand of electric power.

  Further, the supply and demand control program of the present invention is a power supply and demand control program including an upper system having a generator for generating electric power and a lower system having a load device, and a process for changing the frequency of electric power; , And causing the computer to perform a process of detecting a change in frequency and controlling supply and demand of electric power.

  ADVANTAGE OF THE INVENTION According to this invention, the supply-and-demand control of the electric power system by the whole consumer of a low-order system is attained by the instruction | indication of the generator control part of a high-order system. In addition, since the supply and demand control instruction is transmitted using the existing power transmission line, it is not necessary to newly provide an information transmission path, and the cost for constructing the supply and demand control system can be suppressed.

An example of the structure of the electric power system which concerns on the 1st and 2nd embodiment of this invention is shown. An example of the structure of the consumer which concerns on the 1st Embodiment of this invention is shown. An example of the structure of the consumer which concerns on the 2nd Embodiment of this invention is shown. In the supply-and-demand control method which concerns on the 1st and 2nd embodiment of this invention, an example of the time change of a frequency value in case a system | strain power frequency shifts to a high value is shown. In the supply-and-demand control method which concerns on the 1st and 2nd embodiment of this invention, an example of the time change of a frequency value in case a system | strain power frequency shifts to a low value is shown. It is a flowchart which shows an example of the flow of operation | movement of a high-order system | strain in the supply-and-demand control method which concerns on the 1st and 2nd embodiment of this invention. It is a flowchart which shows an example of the flow of operation | movement of a low-order system in the supply-and-demand control method which concerns on the 1st and 2nd embodiment of this invention.

Next, the best mode for carrying out the invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments described below.
[First Embodiment]
[Constitution]
FIG. 1 shows an example of the configuration of a supply and demand control system according to the first embodiment of the present invention.

  In FIG. 1, the power system 100 includes an upper system 200, a power transmission network 300, and a lower system 400.

  The host system 200 includes a generator control unit 210 and a generator 220. In FIG. 1, the upper system 200 includes two generators 220, but is not limited to this, and there may be one generator 220 or three or more generators 220. The generator control unit 210 controls the output of the generator 220 via the host system communication network 230.

  The power transmission network 300 supplies the power output from the generator 220 to the lower system 400.

  The subordinate system 400 includes a consumer 410 and consumes power supplied from the power transmission network 300. The consumer 410 consumes the supplied power with, for example, an electric device that operates in the home.

  In FIG. 1, the subordinate system includes two consumers 410, but is not limited thereto, and there may be one customer 410 or three or more consumers 410. Further, the number of consumers 410 may be different from the number of generators 220 in the higher-level system 200.

  In the supply and demand control system according to the first embodiment of the present invention, the generator control unit 210 controls the generator 220 via the higher-level communication network 230 to instruct a change in frequency, that is, to set the frequency of the system power to normal. Set a value different from the operating state. A change in the frequency of the power supplied by the generator 220 is transmitted to the power transmission network 300 and notified to the entire lower system 400.

  FIG. 2 shows an example of the configuration of the customer 410 according to the first embodiment of the present invention.

  The consumer 410 includes a frequency detector 420, a power conditioner 440, a distributed power source 450, an adjustable load device 460, and other load devices 470.

  The frequency detector 420 detects the frequency of the grid power and determines whether or not demand / supply control is necessary for the customer 410. If it is determined that the supply and demand control is necessary, the frequency detector 420 transmits a consumer supply and demand control notification to the power conditioner 440 and the adjustable load device 460 via the consumer communication line 430.

  The distributed power source 450 generates electric power. The generated power is supplied to the home via the power conditioner 440. Alternatively, the generated power is reversely flowed to the power transmission network 300 via the power conditioner 440.

  At this time, the power conditioner 440 adjusts the voltage or frequency of the generated power to an appropriate value, or suppresses the power generation output (power conversion unit).

  Also, load devices that consume power in the home are classified into adjustable load 460 and other load devices 470.

  The adjustable load device 460 can store energy. That is, operation for consumer demand / supply control is possible using a storage battery or a heat pump water heater. When the supply and demand control is not necessary, the adjustable load device 460 operates in the same manner as the other load devices 470. When receiving the consumer demand / supply control notification from the frequency detector 420, the adjustable load device 460 starts an operation for creating demand and performs an operation that contributes to supply / demand stabilization.

In the present embodiment, for the sake of explanation, the distributed power source 450 is connected to the consumer 410, but the present invention is not limited to this. For example, in this supply and demand system, not all customers 410 need to have a distributed power source 450.
[Operation]
Next, the operation of the present embodiment will be described with reference to FIGS.

  4 and 5 show changes in the frequency of the system power during supply and demand control.

  FIG. 6 is a flowchart illustrating an example of the operation of the upper system 200.

  In FIG. 1, the generator control unit 210 detects the frequency of the power supplied to the power transmission network 300, and determines whether or not consumer supply / demand control is necessary (step S610).

  If supply and demand control is not required (NO in S610), generator 220 is controlled to perform normal operation (step S630). At this time, the frequency of the grid power varies within the rated range.

When it is determined that the consumer supply / demand control is necessary (YES in S610), the generator control unit 210 changes the frequency as shown in FIG. That is, each generator 220 is controlled so that the frequency f of the grid power in the grid is higher than the standard frequency f _std , for example, higher than a predetermined threshold f _th ^H. As a result, the frequency of the system power changes at a higher value than the normal state. This high frequency state is maintained until the generator control unit 210 determines that the consumer supply / demand control is not necessary.

Further, as shown in FIG. 5, each generator 220 has a frequency f of system power that is lower than a predetermined threshold f _th ^L so that the frequency f of the system power takes a value significantly lower than the standard frequency f _std . Control is also conceivable. If the frequency change of FIG. 4 and the frequency change of FIG. 5 are used together, it is possible to generate a state for the frequency f of the three-stage system power.

  Next, the operation of the lower system 400 will be described with reference to FIG.

  FIG. 7 is a flowchart showing an example of the operation of each device in the customer 410.

In FIG. 2, the frequency detector 420 measures the frequency f of the system power and determines whether or not it is higher than a predetermined threshold f _th ^H. That is, the frequency detector 420 measures whether or not the state where the frequency f of the system power exceeds the threshold value f _th ^H for a certain time or longer is maintained (step S710).

If it is determined that the state where the frequency f exceeds the threshold value f _th ^H for a certain time or longer (S710 YES), the process proceeds to step S720, and if not (S710 NO), the process returns to step S710.

  This condition determination prevents the frequency fluctuation resulting from the instability of the power system 100 from being erroneously detected as a consumer supply / demand control instruction. This makes it possible to detect intentional frequency fluctuations of the generator control unit 210.

  When the consumer supply / demand control instruction is received (YES in S710), the frequency detector 420 transmits the consumer supply / demand control instruction to the adjustable load device 460 and the power conditioner 440. In response to the notification, the power conditioner suppresses the output of the distributed power source 450 (step S720).

  FIG. 4 shows the time change of the frequency value when the grid power frequency shifts to a high value.

For the grid power frequency f in the grid, the standard frequency is, for example, 50 hertz or 60 hertz. F _th ^H is a threshold set in the frequency detector.

A time when the frequency f increases and changes from the standard frequency f _std to a value exceeding the threshold f _th ^H is defined as T ₁ . A time when the frequency f changes from a value exceeding the threshold f _th ^H to the vicinity of the standard frequency f _{std is} defined as T ₂ .

The time elapsed from T ₁ is measured, and if it is determined that this time is longer than the predetermined value t _th by T _2, it is determined that a consumer supply / demand control instruction has been received, and the distributed power source 450 is sent to the consumer 410 Is suppressed, the output of the distributed power source 450 is suppressed, and the reverse flow of surplus power from the customer 410 to the power transmission network 300 is suppressed.

  Further, the consumer 410 operates the adjustable load device 460, consumes surplus power in the consumer 410, and balances the supply and demand of power in the power system. This supply and demand suppression instruction continues until there is an instruction to cancel supply and demand suppression. This process will be described below.

  It discriminate | determines about the energy storage state of the adjustable load apparatus 460 during driving | operation (step S730). If the adjustable load device 460 is fully charged (S730 YES), the process proceeds to step S760, and if not (S730 NO), the process proceeds to step S740.

  If the adjustable load device 460 is in the fully stored state (S730 YES), the adjustable load device 460 is stopped (step S760).

  When the adjustable load device 460 of the customer 410 is in a fully stored state, the customer 410 cannot consume the surplus power in the power system 100 any more. Wait until the adjustable load device 460 of another customer 410 connected to the power transmission network 300 consumes surplus power or the generator control unit 210 suppresses the output of the generator 220 of the upper system in the upper system. .

  Note that the stop of the adjustable load device 460 is a process of stopping the operation that consumes surplus power, and means that the operation is performed in the same manner as the other load devices 470. For example, if the battery is a storage battery, the charging operation is stopped and discharged as necessary, and if it is a heat pump water heater, the operation state is changed, such as stopping the water heating operation and supplying hot water as necessary.

The supply / demand control from the generator control unit 210 is released by changing the frequency f of the grid power from the standard frequency _fstd and maintaining a state lower than a predetermined threshold f _th ^L for a predetermined time or more. 410.

In the customer 410, the frequency detector 420 detects the frequency of the system power. It is measured whether or not the state in which the frequency f is lower than the predetermined threshold f _th ^L continues for a certain time or longer (step S770).

When it is determined that the state where the frequency f is lower than the threshold value f _th ^L for a predetermined time or longer is maintained (YES in S770), it is determined that the supply / demand control is released, the supply / demand control process is terminated (step S780), and otherwise (S770 NO). ) Determines that the supply and demand control is continued, and returns to step S770.

  In step S780, the frequency detector 420 transmits to the power conditioner 440 an instruction to cancel the consumer supply / demand control. After the consumer supply / demand control is cancelled, the power conditioner 440 cancels the output suppression of the distributed power source 450 and returns to step S710.

  FIG. 5 shows the time change of the frequency value when the grid power frequency shifts to a low value.

For the system power frequency f in the system, f _th ^L is a threshold set in the frequency detector.

A time at which the frequency f decreases and changes from the standard frequency f _std to a value lower than the threshold f _th ^L is defined as T ₃ . Also, T ₄ is the time at which the frequency f changes from a value below the threshold f _th ^L to the vicinity of the standard frequency f _std .

Measures the time elapsed from T ₃ determines, this time to T ₄ is determined to longer than the predetermined value t _th, the consumer demand control instruction is canceled. At this time, if the customer 410 is equipped with the distributed power source 450, the suppression of the output of the distributed power source 450 is released, and the suppression of the reverse power flow of the surplus power from the customer 410 to the power transmission network 300 is released. .

  If the adjustable load device 460 is not fully charged (NO in S730), the adjustable load device 460 continues to consume surplus power until the generator control unit 210 instructs to cancel the supply and demand control.

In the customer 410, the frequency detector 420 detects the frequency of the system power. It is measured whether or not the state where the frequency f falls below a predetermined threshold f _th ^L continues for a certain time or longer (step S740).

When it is determined that the state where the frequency f is lower than the threshold value f _th ^L for a certain time or longer is maintained (YES in S740), it is determined that the supply and demand control has been released, and the process proceeds to step S750. It determines with continuing and returns to step S740. Thereafter, step S730 and step S740 are repeated until the supply and demand control is canceled, but when the adjustable load device 460 reaches the fully stored state, the process proceeds to step S760. That is, since the adjustable load device 460 of the consumer 410 cannot consume any more surplus power, it waits until the supply and demand control is canceled while the adjustable load device 460 of the other consumer 410 consumes power. .

  In step S750, the frequency detector 420 transmits to the adjustable load device 460 and the power conditioner 440 an instruction to cancel the consumer supply / demand control. After the consumer supply / demand control is canceled, the adjustable load device 460 performs normal operation. In addition, the power conditioner 440 releases the output suppression of the distributed power source 450 and returns to step S710.

  In the supply and demand control system 100 according to the first embodiment of the present invention, the generator control unit 210 in the host system 200 controls the generator 220 so that the frequency has a constant displacement with the standard frequency for a predetermined time. This change in frequency is transmitted via the power transmission network 300, and supply / demand control is instructed to all the customers 410 in the lower system 400 connected to the power transmission network 300. Even if another customer responds to the command, the command can be transmitted to every customer. Thereby, it becomes possible for all the consumers 410 to implement the supply-demand control of the whole lower-order system, and can stabilize supply-demand quickly. In other words, if the surplus power supply is distributed and consumed by each consumer-side load device, it is possible to quickly cope with an imbalance in power supply and demand.

  In addition, the load on the adjustable load device 460 included in each customer 410 is relatively light compared to the case where the customer 410 alone responds to the supply and demand control instruction, and each demand at the time of supply and demand control is relatively small. The influence on the house 410 is also reduced.

  Furthermore, since the generator in the upper system is large, the time constant of the movable part is long, and in the supply and demand control only in the upper system, a delay with respect to a change in the supply and demand situation is inevitable. If the operation is to change the frequency by a predetermined value with respect to the reference frequency as in the present invention, the burden on the generator due to the frequency change is small, and the change in the supply and demand situation can be followed.

Moreover, the supply-and-demand control instruction | indication from the generator control part 210 to each consumer 410 is transmitted using an electric power transmission network. Therefore, it is not necessary to provide a new information transmission path, and it is possible to reduce the cost of building a supply and demand system.
[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an example of the configuration of a supply and demand control system according to the second embodiment of the present invention, and FIG. 3 shows an example of the configuration of a customer 411 included in a lower system 400.

  In FIG. 3, each of the power detector 480 with a built-in frequency detector and the adjustable load device 490 with a built-in frequency detector has a built-in frequency detector (not shown). That is, the frequency conditioner built-in power conditioner 480 and the frequency detector built-in adjustable load device 490 of the present embodiment are the same as the frequency conditioner 440 and the adjustable load device 460 included in the customer 410 according to the first embodiment, respectively. The function of the detector 420 is provided.

  The other components in FIG. 3 are the same as those in the first embodiment, and the operation in response to an instruction from the generator control unit 210 is also the same, so that the description thereof is omitted.

  In FIG. 1, the subordinate system 400 may include a customer 411 according to the second embodiment and a customer 410 according to the first embodiment.

  In the supply and demand control system 100 according to the second embodiment of the present invention, the communication line 430 in the customer 410 according to the first embodiment is not necessary, and the configuration of the customer 411 is simplified. Thereby, the cost of construction of a supply and demand system can be suppressed.

  As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to said each embodiment and Example. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention. Further, the present invention includes a combination of some or all of the configurations of the above-described embodiments as appropriate.

  A program for executing the above-described processing operations is stored and distributed in a computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), and an MO (Magneto-Optical disk). A device that executes the above-described processing operation may be configured by installing the program in a computer.

  The present invention is not limited to the above-described embodiment, and can be suitably applied to a power supply and demand control system in a power system composed of a higher system and a lower system connected via a power transmission network.

  The present invention can be suitably applied to a power system that requires power supply and demand adjustment regardless of the scale, such as a microgrid that performs energy supply and demand adjustment in a small area, or a large-scale power system such as a power company.

DESCRIPTION OF SYMBOLS 100 Electric power system 200 Upper system 210 Generator control part 220 Generator 230 Upper system communication network 300 Power transmission network 400 Sub system 410 Consumer 411 Consumer 420 Frequency detector 430 Communication line 440 Power conditioner 450 Distributed power supply 460 Adjustable load equipment 470 Other load devices 480 Power conditioner with built-in frequency detector 490 Adjustable load device with built-in frequency detector

Claims (10)

A power supply and demand control system comprising an upper system and a lower system,
The upper system is
A generator,
A generator control unit for controlling the generator,
The subordinate system is
A frequency detector;
A power conditioner, and
The generator control unit determines whether or not the consumer supply and demand control is necessary based on the frequency of the power supplied to the power transmission network, and the power generated by the generator when the consumer supply and demand control is necessary. To control the supply and demand of electricity by changing the frequency of
The frequency detection unit detects a frequency of electric power generated by the generator, determines a consumer supply / demand control instruction from the higher-order system based on the detected frequency,
The power conditioner suppresses the amount of power to be output when there is a consumer demand / supply control instruction. A power supply and demand control system comprising an upper system and a lower system,
The upper system is
A generator,
A generator control unit for controlling the generator,
The subordinate system is
A frequency detector;
A power conditioner, and
The generator control unit, when it is determined that it is necessary to demand Yoie supply and demand control, to control the supply and demand of electric power by changing the frequency of power the generator occurs,
The frequency detection unit detects the frequency of the electric power generated by the generator, determines the presence or absence of a consumer supply and demand control instruction from the host system based on the detected frequency,
The power conditioner suppresses the amount of power to be output when there is a consumer demand / supply control instruction.   The frequency detection unit detects a frequency of electric power generated by the generator, and determines that the customer supply / demand control instruction has been received when the detected frequency exceeds a threshold for a predetermined time or more. The supply and demand control system according to claim 2. The lower system includes a load device that can consume power,
4. The supply and demand control system according to claim 2, wherein the load device increases power consumption when the consumer supply and demand control instruction is issued. 5.   The frequency detection unit detects a frequency of electric power generated by the generator, and determines that the consumer supply and demand control instruction is canceled when the detected frequency is lower than a threshold for a predetermined time or more. The supply and demand control system according to claim 4.   The said power conditioner cancels | releases suppression of the electric energy output when the said consumer demand / supply control instruction | indication is cancelled | released, The supply-demand control system of Claim 5 characterized by the above-mentioned. A frequency detector;
A power conditioner, and
The frequency detection unit detects the frequency of electric power generated by a generator provided in the upper system, determines the presence or absence of a consumer supply and demand control instruction from the upper system based on the detected frequency,
The power conditioner is a subordinate system device that suppresses the amount of electric power to be output when there is an instruction to control the supply and demand of the consumer. A generator,
A generator control unit for controlling the generator,
The generator control unit determines whether or not the consumer supply and demand control is necessary based on the frequency of the power supplied to the power transmission network, and the power generated by the generator when the consumer supply and demand control is necessary. A host system apparatus that controls supply and demand of electric power by changing the frequency of the power supply. A power supply and demand control method including an upper system having a generator for generating electric power and a lower system having a load device ,
And controlling the supply and demand of electric power by when demand Yoie supply and demand control is determined to be necessary, to change the frequency of the power the generator in which the upper grid comprises occurs,
Detecting the frequency of electric power generated by the generator, and determining the presence or absence of a consumer supply and demand control instruction from the higher-order system based on the detected frequency;
A supply and demand control method comprising the step of suppressing the amount of electric power output by a power conditioner provided in the lower system when there is an instruction for consumer demand and supply control. A power supply and demand control program for a power system including a host system having a generator for generating power and a subordinate system having a load device,
When it is determined that consumer supply and demand control is necessary, a process of controlling supply and demand of power by changing the frequency of power generated by the generator included in the host system; and
Detecting the frequency of power generated by the generator, and determining the presence or absence of a consumer supply and demand control instruction from the host system, based on the detected frequency,
When there is the consumer supply and demand control instruction, processing to suppress the amount of power output by the power conditioner provided in the lower system,
A program for supply and demand control characterized by causing a computer to execute the above.

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