JP2012044745A - Energy management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system that receives and controls requests from a demand side to save on energy forcibly according to the power supply state.SOLUTION: The energy management system includes: power management devices 4a-4c that has power adjustment means 8a-8c for controlling supply power by controlling supply voltages to loads 2a-2c, second power adjustment means 9a-9c for blocking power supply and communication means 5a-5c for communicating with the outside; a management server device 6 for managing a certain range of demand and supply power according to status signals indicating the supply voltages, currents, powers and the like to the loads 2a-2c; voltage drop direction means 7 for directing a voltage drop in cases where the demand and supply power exceeds a first supply level; and blockage direction means 17 for directing the second power adjustment means 9a-9c to block the loads 2a-2c partially in said cases.

Description

  The present invention relates to a power management device that is inserted in series between an AC power supply and a load to adjust load power, and an energy management system that comprehensively manages and operates the power management device.

  Conventionally, this type of energy management includes a transformer as an AC power supply device, a primary winding connected to the AC power supply side, a correction voltage generator on the secondary winding side, and a secondary winding of the transformer. In some cases, the adjusted voltage is supplied to the load by adjusting the correction voltage on the side (see, for example, Patent Document 1).

  In Patent Document 1, as shown in FIG. 10, input AC power is supplied to the primary main winding 101 a of the transformer 101, and the correction voltage generator 102 is a deviation between the voltage of the input AC power and the target AC output voltage. A correction voltage corresponding to is generated and output. The supplied correction voltage is combined with the input AC voltage by the transformer 101 and can be output to the load side as an output AC power supply.

JP 2000-315116 A

  However, in the example of Patent Document 1, since the output AC power supply voltage to the load side can output a desired stable voltage by the correction voltage, the load side power reduction effect by reducing the voltage can be obtained. Since it is only adjusted to a desired voltage set in advance, whether or not the power can be reduced to a desired power is undefined. Therefore, regardless of whether or not there is a request from the demand side, the effect is limited to a predetermined energy saving effect. For example, there is a problem that it is not possible to cope with forced energy saving so as to be less than the contract power. Also, instead of a system that monitors and controls multiple power management devices in an integrated manner, voltage adjustment control for power reduction is performed with individual set values that are autonomously distributed, so it is desirable to suppress the total power at the receiving point. In some cases, there is a problem that it is not possible to cope with energy management for each section in factory equipment.

  Therefore, the present invention solves the above-described problems, and can reduce the load power to a desired power, and when requested by the demand side, it is compulsorily set to a desired power or less. Since it is possible to monitor and control a plurality of power management apparatuses in an integrated manner, it is possible to provide an energy management system that can cope with the suppression of the total power at the power receiving point.

  In order to achieve this object, the energy management system of the present invention is connected between a plurality of loads and a commercial power supply, and controls a supply voltage to the plurality of loads to a desired voltage. Power control means for controlling power supplied to the power supply, second power control means for cutting off power supply to the plurality of loads, a plurality of power management devices including communication means for communicating with the outside, and the communication power obtained by the communication means An energy management system including a management server device that manages supply and demand power in a specific range from a load status signal indicated by supply voltage, supply current, and supply power to the load, wherein the management server device supplies and supplies power in the specific range When the power exceeds the first supply level, the desired voltage of the power adjusting means until the power supply becomes lower than the first supply level or until the predetermined control voltage lower limit value is reached. A voltage drop command means for commanding to reduce, and a command to the second power adjustment means to partially cut off a plurality of loads when the supply and demand power does not fall below the first supply level due to a voltage drop. A shut-off command means is provided, thereby achieving the intended purpose.

  According to the present invention, the power adjusting means is connected between a plurality of loads and a commercial power source, controls the supply voltage to the plurality of loads to a desired voltage, and controls the supply power to the plurality of loads, Second power adjustment means for cutting off power supply to a plurality of loads, a plurality of power management devices provided with communication means for communicating with the outside, and supply voltage, supply current, and supply power to the load obtained by the communication means An energy management system comprising a management server device that manages supply / demand power in a specific range from a load status signal, wherein the management server device, when supply / demand power in the specific range exceeds a first supply level, Voltage drop command means for commanding to reduce the desired voltage of the power adjusting means until the first supply level is lower than or below a predetermined management voltage lower limit value; When the power supply does not fall below the first supply level, a configuration is provided that includes a shut-off command means for commanding the second power adjusting means so as to partially shut off a plurality of loads. Power can be reduced, and when there is a demand from the demand side, it responds to compulsory energy savings so that it is less than the desired power, and monitors multiple power management devices in an integrated manner. Since it can control, the energy management system which can respond to suppression of the total electric power in a receiving point can be provided.

Configuration diagram of energy management system according to Embodiment 1 of the present invention Configuration diagram of the power management device Flow chart of the power adjustment means Configuration diagram of energy management system according to Embodiment 2 of the present invention Configuration diagram of energy management system according to Embodiment 3 of the present invention The block diagram of the energy management system of Embodiment 4 of this invention Configuration diagram of energy management system according to Embodiment 5 of the present invention Determination flowchart of the impedance determination means Flow chart of the lowering condition setting means Configuration diagram of conventional power conditioner

  The energy management system according to claim 1 of the present invention is connected between a plurality of loads and a commercial power supply, controls a supply voltage to the plurality of loads to a desired voltage, and supplies power to the plurality of loads. A power adjusting means for controlling, a second power adjusting means for cutting off power supply to the plurality of loads, a plurality of power management devices comprising communication means for communicating with the outside, and a supply voltage to the load obtained by the communication means , An energy management system comprising a management server device that manages supply and demand power in a specific range from a load status signal indicated by supply current and supply power, wherein the management server device supplies the supply and demand power in the specific range as a first supply When the level is exceeded, a command is issued to lower the desired voltage of the power adjustment means until the level is lower than the first supply level or until a predetermined management voltage lower limit value is reached. And a voltage drop command means for instructing the second power adjustment means to partially cut off a plurality of loads when supply and demand power does not fall below the first supply level due to a voltage drop. It is provided. As a result, it is normally controlled to a desired voltage (for example, 100V for the 100V system, 200V for the 200V system), and the supply voltage is set to the predetermined management voltage lower limit value (depending on whether the supplied power exceeds the predetermined power). For example, since it is possible to control or cut off the load to 95V in the 100V system and 180V in the 200V system, it is possible to perform forced energy saving according to the required power from the demand side, In addition, it manages the power supply and demand status, supply voltage and supply current, etc. in a specific range (for example, the entire housing complex or residential complex in the residential field, or the building or factory unit in the non-residential field), and abnormal use of the power system Provide an energy management system that can monitor

  According to a second aspect of the present invention, the voltage drop command means is provided in the power adjustment means, and the management server device outputs the first supply level as a command to the voltage drop command means. Thereby, supply and demand power in a specific range by the management server device can be collectively controlled, and the power adjustment means is provided with a voltage drop command means so that the power consumption becomes the first supply level, so that the control is shared. Provided is an energy management system that can be a management server device capable of managing and operating a large number of power adjustment means with a simpler and less expensive configuration, and can reduce the processing time and cost of the entire system.

  In addition, the energy management system according to claim 3 is configured to execute at predetermined time intervals so as to cut off loads other than the predetermined load after a predetermined time has elapsed after blocking the predetermined load. Is. This makes it possible to determine the power supply and demand based on the stable load power value to be managed after the load is cut off, so that energy management that can stabilize the entire system without needing a new load cut or turning on / off the load unnecessarily. Provide a system.

  According to a fourth aspect of the present invention, in the energy management system, the voltage drop command means holds the supply voltage to the plurality of loads, the step of reducing the supply voltage to the plurality of loads, and the supply power to the plurality of loads. It has a step of detecting, and it is configured to repeatedly control until it becomes alternately below the first supply level or until a predetermined management voltage lower limit value is reached. Thereby, since it is possible to wait for the time until the power consumption with respect to the supply voltage on the load side is stabilized, an energy management system capable of preventing an unnecessary and excessive decrease in the supply voltage is provided.

  Further, in the energy management system according to claim 5, the voltage drop command means is provided in the management server device, and the power adjustment of the set value of the supply voltage is prioritized from the power adjustment means having a large supply power among the plurality of power adjustment means. It is configured to output as a command to the means. Thereby, since the power consumption in a specific range can be reduced more effectively and at high speed, an energy management system capable of saving energy in a shorter time is provided.

  Further, the energy management system according to claim 6 is configured such that the shut-off command means cuts off partially in preference to the power adjusting means having a large supply power among the plurality of power adjusting means. As a result, the management server device is equipped with a management server device to manage and control settings such as the power shut-off device, so that it is possible to reduce the total power consumption in a specific range and enable a wider range of power adjustment. I will provide a.

  According to a seventh aspect of the present invention, the voltage drop command means and the shut-off command means are provided in the power adjustment means, and the management server device indicates whether or not the supplied power is excessive for the power adjustment means. The method of transmitting bit information and reducing the supply power is configured to be determined by the power adjustment means. This provides an energy management system that can reduce the data collection and operation processing scale of the management server device when the specific range to be managed and controlled becomes wide.

  In addition, the energy management system according to claim 8 includes power adjustment means or priority setting means for setting supply priority in the management server apparatus, and a plurality of power management means connected to the plurality of power adjustment means according to the supply priority. The power supply to the load is controlled. This provides an energy management system capable of improving convenience by improving operation efficiency by continuous operation, or by reducing power consumption or cutting off a power supply for a load that requires continuous operation.

  The energy management system according to claim 9 is configured such that the management voltage lower limit value can be rewritten by communication from the management server device. As a result, individual setting is possible instead of a uniform management voltage lower limit value, so if the supply voltage drop is large due to voltage drop due to the line impedance from the power control device to the end load, the standard management voltage lower limit value (For example, 95V for the 100V system and 180V for the 200V system) Instead of the set voltage (for example, 96V for the 100V system, 182V for the 200V system), multiple loads may malfunction due to low voltage. Provided is an energy management system capable of preventing operational troubles such as extremely low performance (for example, flickering of lighting equipment).

  Further, in the energy management system according to claim 10, the command from the power adjustment means or the management server device detects the supply voltage to each of the plurality of loads, and the lowest supply voltage among the plurality of loads is the management voltage. In this configuration, the adjustment is made so as not to fall below the lower limit. Thereby, for example, even if the range of the load per power control device is wide and the line impedance of the distribution line up to the end load is large, a minimum supply voltage can be secured, and a plurality of loads Provided is an energy management system capable of preventing operational troubles such as malfunctions caused by low voltage and extreme deterioration of performance (for example, flickering of lighting equipment).

  The energy management system according to claim 11 is configured such that the shutoff command means can shut off each of the plurality of loads individually. Thereby, the energy management system which can prevent that several power supplies cut off a power supply simultaneously is provided.

  The energy management system according to claim 12 is an impedance determination unit that determines an impedance of a commercial power source from an input voltage of a power adjustment unit before and after a supply voltage to a plurality of loads is reduced, and an impedance determination value of the commercial power source. A reduction condition setting means for determining a supply voltage decrease command width and a decrease lower limit value is provided. As a result, it is possible to estimate in advance the influence on the higher-order voltage due to the drop in the supply voltage to the load connected to the power adjustment means, that is, the influence on other series loads, and at the same time, the target supply power can be quickly achieved. And an energy management system that prevents supply voltage from falling below the lower limit of the management voltage with respect to the load connected to the output side of the power adjustment means, and enables more stable power supply.

(Embodiment 1)
Hereinafter, the energy management system 1 will be described with reference to FIGS. FIG. 1 is a diagram illustrating a configuration of an energy management system 1. The energy management system 1 includes power management devices 4 a to 4 c and power management devices 4 a to 4 c respectively connected between loads 2 a to 2 i and a commercial power source 3. A management server device 6 is provided that communicates with the provided communication means 5a to 5c and inputs state signals of the loads 2a to 2i such as supply voltage, supply current, and supply power to the loads 2a to 2i. In addition, the management server device 6 includes a voltage drop command unit 7 that transmits a voltage drop command to the communication units 5a to 5c.

  Next, because of the same configuration, the configuration of the power management device 4a as a representative of the power management devices 4a to 4c will be described with reference to FIG. As shown in FIG. 2, the power management device 4 a is connected between the loads 2 a to 2 c and the commercial power source 3. The power management device 4a controls the supply voltage to the loads 2a to 2c to a desired voltage (for example, 100V for the 100V system, 200V for the 200V system), and the supply power to the loads 2a to 2c is a predetermined first supply level. (For example, 4 kW), the voltage drop command from the voltage drop command means 7 (for example, 98V for the 100V system, 190V for the 200V system) is received by the communication means 5a and controlled to a voltage lower than the desired voltage. When the supply power to the loads 2a to 2c exceeds a predetermined second supply level (for example, 5 kW) or when the power adjustment means 8a controls the supply power to the loads 2a to 2c Power supply to the loads 2a to 2c is interrupted when the upper limit of the control voltage, that is, the lower limit value of the management voltage (for example, 95V for the 100V system and 180V for the 200V system) is reached. And a second power adjustment means 9a for. Here, if the loads 2a to 2c are resistance loads, the power adjustment means 8a increases the supply power in proportion to the square of the supply voltage, and conversely controls the supply voltage to a voltage lower than the desired voltage. By doing so, the power is reduced, and the fact that the power can be controlled is utilized. The management voltage lower limit value can be rewritten from the management server device 6 through the communication means 5a. For example, when the supply voltage drop is large due to the voltage drop due to the line impedance to the load 2c at the end, the standard management voltage Instead of the lower limit value (for example, 95V for the 100V system, 180V for the 200V system), it is rewritten with a set voltage (for example, 96V for the 100V system, 182V for the 200V system). Further, the power adjustment means 8a has a bidirectional power control unit 10a and a series transformer 11a as a configuration for controlling the supply voltage to the loads 2a to 2c, and the second power adjustment means 9a A cutoff relay 12a and a cutoff signal generator 13a for generating a supply cutoff signal are provided. Further, when adjusting the supply power to the loads 2a to 2c, the first step for giving priority to the adjustment by the power adjustment means 8a and the second step by the execution of the second power adjustment means 9a are executed in order. The step execution unit 14a includes a first supply level (for example, 2 kW) as a threshold level for executing the first step and a second threshold level for executing the second step. Different supply levels are set so that the steps are executed according to the result of comparison with each of the supply levels (for example, 3 kW). In addition, the power adjustment unit 8a sets a lower limit value so as to adjust to a range that does not fall below the management voltage lower limit value, and the target value for adjusting the supply voltage to the loads 2a to 2c by the power adjustment unit 8a is the management voltage. When the lower limit value is reached, the step execution unit 14a is configured such that the second power adjustment unit 9a executes the second step. Further, the second power adjusting means 9a is configured to individually block each of the loads 2a to 2c, and each priority can be set for the loads 2a to 2c. A selective blocking means 15a for blocking is provided. Furthermore, the communication means 5a can transmit the supply conditions to the loads 2a to 2c to the outside, and can rewrite parameters relating to the power adjustment of the loads 2a to 2c from the outside. The second power adjusting means 9a includes a supply cutoff relay 12a, a cutoff signal generation unit 13a that generates a supply cutoff signal, and a signal input unit 16a that inputs a signal for connecting and disconnecting the relay 12a. . When the total load amount of the plurality of loads of the loads 2a to 2c exceeds the second supply level, a cutoff signal is input to the signal input unit 16a. At that time, a part of the plurality of loads is cut off in order from the load with the lowest priority according to the information on whether or not to cut off the loads 2a to 2c input to the cut-off command means 17a and the priority set by the selective cut-off means 15a. . A lower priority load (for example, load 2a) is cut off, and after a predetermined time has passed, the total load amount is compared with the second supply level. (For example, load 2b) is cut off. By repeating this process until the second supply level or less, the second power adjustment unit 9a reduces the supply power.

  Next, an execution flowchart of the power adjustment unit 8a will be described with reference to FIG. As illustrated in FIG. 3, the power adjustment unit 8 a detects the supply power to the loads 2 a to 2 c by lowering the supply voltage to the loads 2 a to 2 c and holding the supply voltage to the loads 2 a to 2 c. It has steps, and is configured to execute alternately at predetermined time intervals (for example, every 10 seconds). The power adjustment means 8a compares the detected value of the power supplied to the loads 2a to 2c with the first supply level, and stops the decrease in the supply voltage to the loads 2a to 2c when the detected value falls below the first supply level. The supply voltage at that time is held. The power adjustment unit 8a detects the supply voltage to the loads 2a to 2c and adjusts the load 2a to 2c so that the lowest supply voltage does not fall below the management voltage lower limit value.

  By using the energy management system as described above, it is normally controlled to a desired voltage (for example, 100V for the 100V system, 200V for the 200V system), and supplied depending on whether or not the supplied power exceeds the predetermined power. Since the voltage can be controlled to drop to the specified lower limit of the management voltage or the load can be cut off, it is possible to perform forced energy saving according to the required power from the demand side, and a specific range Manage the power supply and demand status, supply voltage and supply current, etc. (for example, in residential areas, collective housing and entire housing estates, and in non-residential areas, buildings, factory buildings, etc.) and monitor abnormal use of the power system Can provide an energy management system. In addition, after executing a shut-off to a predetermined load, since a predetermined time interval is performed so that a load other than the predetermined load is shut off after a predetermined time has elapsed, the management target is stabilized after the load is shut off. Since the supply and demand power can be determined from the load power value, it is possible to provide an energy management system capable of stabilizing the entire system without needing a new load interruption or turning on / off the load unnecessarily. The voltage reduction command means includes a step of reducing the supply voltage to the plurality of loads, a step of holding the supply voltage to the plurality of loads, and detecting the supply power to the plurality of loads. Since it is configured to repeatedly control until the supply voltage becomes one supply level or less, or until the predetermined management voltage lower limit value is reached, it is possible to wait for the time until the power consumption for the supply voltage on the load side is stabilized. It is possible to provide an energy management system that can prevent unnecessary and excessive supply voltage drop. Also, in order to adjust the supply voltage to a plurality of loads so that the lowest supply voltage does not fall below the lower limit of the management voltage, for example, the load range per power control device is wide, and the distribution to the end load is wide. Even when the line impedance of the electric wire is large, the minimum supply voltage can be secured, and multiple loads operate like malfunctions due to low voltage or extreme decline in performance (for example, flickering of lighting fixtures) An energy management system that can prevent the above problems can be provided. Further, since the shutoff command means shuts off each of the plurality of loads individually, it is possible to provide an energy management system that can prevent the power from being shut off at the same time for the plurality of loads.

(Embodiment 2)
Hereinafter, the structure of the energy management system 1B in Embodiment 2 is demonstrated, referring FIG. In addition, the same code | symbol is attached | subjected about the component similar to Embodiment 1, and the detailed description is abbreviate | omitted.

  As shown in FIG. 4, the energy management system 1 </ b> B includes voltage reduction command units 7 </ b> A to 7 </ b> C in the power adjustment units 8 a to 8 c. The voltage drop command means 7A to 7C input the first supply level (for example, 2 kW) as a command from the management server device 6 via the communication means 5a to 5c. The power adjustment means 8a to 8c perform voltage adjustment according to the first supply level input from the voltage reduction means 7A to 7C, and control repeatedly until a predetermined management voltage lower limit value is reached.

  By using the energy management system as described above, it is possible to collectively control the supply and demand power in a specific range by the management server device, and the voltage reduction command means so that the power consumption is at the first supply level. It is possible to provide an energy management system capable of sharing the control, simplifying the configuration of the management server device, and reducing the processing time and cost of the entire system.

(Embodiment 3)
Hereinafter, the configuration of the energy management system 1C according to Embodiment 3 will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the component similar to Embodiment 1-2, and the detailed description is abbreviate | omitted.

  As shown in FIG. 5, the energy management system 1 </ b> C includes the voltage drop instruction unit 7 in the management server device 6, and the power supply unit 8 a to 8 c has a larger supply power, for example, the power adjustment unit 8 c is supplied with priority. The setting value of the voltage is lowered, and the voltage is output as a command to the power adjustment unit 8c via the communication unit 5c. For example, it is set to 98V for the power adjustment means 8a and 8b, and to 96V for the power adjustment means 8c. Since the management server device 6 inputs the supply voltage, supply current, and supply power of the power adjustment means 8a to 8c from the power adjustment means 8a to 8c via the communication means 5a to 5c, the supply power is supplied It is possible to specify the power adjustment means 8c having a large power.

  By setting it as the above energy management systems, since the power consumption in a specific range can be reduced more effectively and at high speed, the energy management system which can perform energy saving in a short time can be provided.

(Embodiment 4)
Hereinafter, the configuration of the energy management system 1D in the fourth embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the component similar to Embodiment 1-3, and the detailed description is abbreviate | omitted.

  As shown in FIG. 6, in the energy management system 1 </ b> D, the voltage drop command means 7 a to 7 c and the cutoff command means 17 a to 17 c are provided in the power adjustment means 8 a to 8 c, and the management server device 6 is provided with the priority setting means 18. The priority of the loads 2a to 2i can be set. The management server device 6 transmits the priority of the loads 2a to 2i simultaneously with the bit information indicating whether or not the supply power is excessive for the power adjustment means 8a to 8c, and the method for reducing the supply power is as follows: The power adjustment means 8a to 8c are configured to determine. In addition, among the plurality of power adjustment units 8a to 8c, when the supply power is large, for example, the bit information indicating excessive supply power from the management server device 6 in preference to the power adjustment unit 8a, and when supply power is excessive. The power adjustment means 8a, which transmits the priority order of the loads 2a to 2c and receives bit information indicating excessive supply power, appropriately lowers the supply voltage from the voltage drop command means 7a to a predetermined management voltage lower limit value. Outputs a command. When the control voltage lower limit value is reached, the interruption command means 17a partially cuts off the loads 2a to 2c in order of lower priority, for example, the load 2a.

  By using the energy management system as described above, the setting of the load to be blocked by the power adjustment means is collectively managed and controlled in the management server device, so the total power consumption in a specific range can be suppressed, It is possible to provide an energy management system that enables a wider range of power adjustment. The voltage drop command means and the shutoff command means are provided in the power adjustment means, and the management server device transmits bit information indicating whether or not the supply power is excessive to the power adjustment means, thereby reducing the supply power. Since the power adjustment means determines the method to do this, it is possible to provide an energy management system that can reduce the data collection and operation processing scale of the management server device when the specific range to be managed and controlled becomes wide.

(Embodiment 5)
Hereinafter, the configuration of the energy management system 1E in the fifth embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the component similar to Embodiment 1-4, and the detailed description is abbreviate | omitted.

  As shown in FIG. 7, in the energy management system 1E, the management server device 6B determines the impedance of the commercial power supply 3 from the input voltage of the power adjustment means 8a to 8c before and after the supply voltage to the loads 2a to 2i decreases. And a reduction condition setting means 20 for determining a supply voltage reduction command width and a reduction lower limit value from the impedance judgment value of the commercial power source 3.

  Next, a determination flowchart of the impedance determination unit 19 will be described with reference to FIG. 8 with the power adjustment unit 8a as a representative. As shown in the figure, the impedance determination unit 19 outputs a voltage command to the bidirectional power control unit 10a so that the output current from the power adjustment unit 8a to the loads 2a to 2c becomes the maximum Iw. That is, the voltage vector on the primary winding side of the series transformer 11a is controlled to be in phase with the commercial power source 3. However, at this time, the voltage is increased so as to be a predetermined upper limit value of the management voltage (for example, 107V for the 100V system and 220V for the 200V system). The power supply voltage V1 of the commercial power supply 3 at this time is detected and stored. Next, the impedance determination means 19 instructs the bidirectional power control unit 10a to change the power factor of the output current to 0.85, to output the reactive current Iq simultaneously with the effective current Iw. The changed power supply voltage V2 of the commercial power supply 3 is detected. Next, the loads 2a to 2c connected to the power adjustment means 8a are cut off, that is, without power flow, and the power supply voltage Vo of the commercial power supply 3 at that time is detected. At this time, the relationship of Vo, V1, V2, Iw, and Iq can be solved with respect to Rs and Xs by establishing a simultaneous equation in Equation 1 when the impedance of the commercial power supply 3 is Rs + jXs.

  Furthermore, the bidirectional power is calculated from the obtained Rs, Xs and the maximum allowable voltage Vmax of the commercial power source 3, and the power source voltage Vo of the commercial power source 3 when the output from the bidirectional power control unit 10a to the loads 2a to 2c is zero. When the voltage supplied to the loads 2a to 2c by the control unit 10a is increased or decreased, the sensitivity S of the input voltage with respect to the voltage adjustment width ΔV of the power adjustment unit 8a is calculated by Equation 2. This calculated sensitivity is input to the reduction condition setting means 20.

  Next, a flowchart of the lowering condition setting unit 20 will be described with reference to FIG. 9 with the lowering condition setting unit 20a as a representative. As shown in the figure, the decrease condition setting means 20a calculates the decrease command width Vred by performing the calculation of Expression 3 from the input sensitivity S and the supply power target value Wref that is the convergence target value.

  Next, from the input sensitivity and the voltage Vgrid detected by the commercial power source 3, the lower limit value (ΔVmax) is calculated by performing the calculation of Equation 4. Further, the calculated decrease command width is compared with the lower limit value, and when the decrease command width is larger than the lower limit value, the decrease command width is updated with the lower limit value and limited.

  As described above, the reduction command width is determined, and the supply power reduction expectation value Wred to the loads 2a to 2c is further calculated from the reduction command width by Equation 5.

  Next, subtract the calculated supply power reduction expected value from the current supply power, calculate the supply power expected value (Wadd) after reduction, and compare it with the supply power target value. For example, the voltage is lowered by the power adjusting unit 8a, and if the power exceeds the target value, the loads 2a to 2c are sequentially cut off according to the priority order.

  By using the energy management system as described above, it is possible to estimate in advance the influence on the higher-order voltage due to the supply voltage drop to the load connected to the power adjustment means, that is, the influence on other series loads. Convergence to the target supply power earlier and prevent the supply voltage from falling below the lower limit of the management voltage for the load connected to the output side of the power adjustment means, enabling more stable power supply Provide energy management system.

  Since the energy management system according to the present invention collectively manages and controls the power consumption of the load in the target range of the system, the load power is saved before the power supply to the load is cut off. It is possible to provide a management system that can perform total power management regardless of general households, factory facilities, and building facilities since it can be optimally controlled without causing a sense of incongruity to the user.

DESCRIPTION OF SYMBOLS 1 Energy management system 1B-1E Energy management system 2a-2i Load 3 Commercial power supply 4a-4c Power management apparatus 5a-5c Communication means 6 Management server apparatus 7 Voltage drop command means 7A-7C Voltage drop command means 8a-8c Power adjustment means 9a to 9c Second power adjusting means 10a to 10c Bidirectional power control unit 11a to 11c Series transformer 12a to 12c Relay 13a to 13c Cut off signal generator 14a to 14c Step execution unit 15a to 15c Select cut off means 16a to 16c Signal input Unit 17 Blocking command means 17a to 17c Blocking command means 18 Priority setting means 19 Impedance determination means 20 Reduction condition setting means

Claims (12)

Power adjusting means connected between a plurality of loads and a commercial power source, controlling a supply voltage to the plurality of loads to a desired voltage, and controlling a supply power to the plurality of loads, power to the plurality of loads A second power adjustment means for cutting off the supply, a plurality of power management devices provided with communication means for communicating with the outside, and a load status signal such as supply voltage, supply current, and supply power to the load obtained by the communication means An energy management system comprising a management server device for managing supply / demand power in a specific range from the first supply level when the supply / demand power in the specific range exceeds a first supply level. Voltage reduction command means for instructing to lower the desired voltage of the power adjustment means until the voltage reaches the predetermined management voltage lower limit value, and supply and demand power is If not less than the supply level, energy management system characterized by having a cutoff command means for instructing to the second power adjustment means so as to cut off a plurality of loads partially. 2. The energy management system according to claim 1, wherein the voltage drop command means is provided in the power adjustment means, and the management server device outputs the first supply level as a command to the voltage drop command means. 3. The energy management system according to claim 1, wherein the energy management system is executed at predetermined time intervals so that a load other than the predetermined load is interrupted after a predetermined time has elapsed after the interruption to the predetermined load. . The voltage drop command means has a step of reducing the supply voltage to the plurality of loads and a step of holding the supply voltage to the plurality of loads and detecting the supply power to the plurality of loads, and alternately supplying the first supply The energy management system according to claim 1, wherein the energy management system is repeatedly controlled until the level becomes equal to or lower than a level or until a predetermined management voltage lower limit value is reached. The voltage drop command means is provided in the management server device, and outputs a set value of the supply voltage as a command to the power adjustment means in preference to the power adjustment means having a large supply power among the plurality of power adjustment means. Item 5. The energy management system according to any one of Items 1, 3 and 4. The energy management according to any one of claims 1, 2, 4, and 5, wherein the shutoff command means preferentially shuts off the power adjustment means having a larger supply power in priority among the plurality of power adjustment means. system. The voltage drop instruction means and the cutoff instruction means are provided in the power adjustment means, and the management server device transmits bit information indicating whether or not the supply power is excessive to the power adjustment means, and reduces the supply power. The energy management system according to any one of claims 1 and 4, wherein power adjustment means is determined. A power adjustment means or a priority setting means for setting a supply priority in the management server device is provided, and power supply to a plurality of loads connected to the plurality of power adjustment means is controlled according to the supply priority. The energy management system according to any one of claims 1 to 7. 9. The energy management system according to claim 2, wherein the management voltage lower limit value can be rewritten by communication from a management server device. The command from the power adjustment means or the management server device detects the supply voltage to each of the plurality of loads, and adjusts the lowest supply voltage to a range in which the lowest supply voltage does not fall below the management voltage lower limit value among the plurality of loads. The energy management system according to claim 1. The energy management system according to any one of claims 1 to 10, wherein the shutoff command means can shut off each of the plurality of loads individually. Impedance determination means for determining the impedance of the commercial power source from the input voltage of the power adjustment means before and after the supply voltage to the plurality of loads drops, and the supply voltage lowering command width and lowering lower limit value are determined from the commercial power source impedance judgment value The energy management system according to any one of claims 1 to 11, further comprising a lowering condition setting means.

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