HK1151785B - Energy-saving running system of elevator - Google Patents

Description

Energy-saving operation system of elevator

Technical Field

The present invention relates to an elevator control system for comprehensively controlling a plurality of elevators, and is particularly suitable for an elevator apparatus for controlling the power of a plurality of elevators to perform energy-saving operation.

Background

In the prior art, an elevator control system improves the operation efficiency of an elevator in consideration of convenience, energy saving and space saving of the elevator, so that waiting time and moving time are limited to the minimum, thereby maximizing smooth operation of the elevator. In addition, elevators are typically peak power type loads, which need to be handled and reduced in order to save energy.

For example, patent document 1 discloses a technique for operating an elevator car group by selecting a specific operation schedule when the total peak power consumption at any given moment is lower than a predetermined threshold value in order to suppress the total peak power consumption of a plurality of elevator cars.

For example, patent document 2 discloses a technique for controlling the speed of an elevator at a predetermined maximum speed or a predetermined acceleration when an elevator is operated and an electricity demand warning is issued when a predicted value of the electricity demand exceeds a contract power in order to prevent the electricity demand of the entire office building from exceeding the contract power.

Patent document 3 discloses a configuration in which, in order to effectively use the permitted power amounts of the elevators in the permitted power amounts of the entire building during elevator operation, the permitted power amounts to be consumed by the respective elevators are detected, and the number of elevators capable of being simultaneously started is divided by the permitted power amounts, so that the number of starting permitted elevators to be allocated is set in accordance with the number of elevators capable of being started.

Patent document 4 discloses a technique for limiting the number of times of operation by starting restriction in units of weeks and time periods in consideration of a target power consumption value and an energy saving control level by predicting the number of times of operation, a probability of occurrence of an elevator hall call, and the like from a learning result in order to control a degree of deterioration in convenience of an elevator to a minimum range and surely achieve an energy saving target on the basis of the minimum degree.

Prior art documents

Patent document

Japanese patent laid-open No. 2008-308332 of patent document 1

Patent document 2 Japanese patent application laid-open No. 2009 and 96582

Patent document 3 Japanese patent application laid-open No. Hei 4-217570

Patent document 4 Japanese patent application laid-open No. 2007-55700

In the above-described conventional technique disclosed in patent document 1, since the total peak power consumption is suppressed only by selecting a specific operation schedule, the total peak power consumption of the plurality of elevators at each time point cannot be suppressed effectively, and since the operation schedule is determined by the total peak power consumption, the service quality (for example, waiting time) of the passengers at each time point may be greatly affected, and the service quality may be degraded.

In the solution disclosed in patent document 2, only the entire power demand is taken into consideration, and therefore, as in patent document 1, the quality of service to passengers of each elevator is degraded. Especially when the maximum speed of all elevators is uniformly reduced or reduced according to the average waiting time of all elevators, the quality of service of the operation of the elevator passengers for the time period is greatly reduced. Also, since this solution limits the maximum speed or acceleration of the elevator, it may happen that the power is excessively reduced, resulting in a reduction in the quality of service.

Similarly, in the solution disclosed in patent document 3, the number of elevators that can be started is limited, so that the quality of service to passengers is greatly reduced.

In the solution disclosed in patent document 4, since the number of times of operation is uniformly limited for all the elevators (the total number of elevators), the quality of service to passengers of each elevator is significantly reduced.

As described above, in the conventional technology, it is difficult to effectively and reliably control the total power at each time point of a plurality of elevators to be equal to or lower than a predetermined value, and there is a possibility that the operation service quality of passengers of each elevator is degraded and the passengers of a specific elevator are greatly affected.

Disclosure of Invention

The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to reliably and effectively suppress the total power of a plurality of elevators at each time point, and to reduce adverse effects (degradation in operation service quality) on passengers of each elevator at each time point.

Another object of the present invention is to provide a passenger with good service while performing energy-saving operation by limiting the power of each elevator without causing a large difference in the operation service quality of each elevator as a whole.

Still another object of the present invention is to significantly reduce the capacity of the entire power receiving equipment (the total power receiving equipment that supplies power to each elevator) of an elevator.

Also, the present invention achieves at least one of the above objects.

Solution scheme

In order to achieve the above object, the present invention provides an energy-saving operation system for an elevator for controlling operation of an elevator serving a plurality of floors, in which an energy-saving operation system for an elevator determines a power suppression value of each of the elevators based on a total power suppression value that suppresses a total use power value (use power value) that is a total use power value obtained by summing up use power values of a plurality of the elevators to be equal to or less than a threshold value, and the elevator performs energy-saving operation based on the power suppression value.

In addition, the present invention provides an energy-saving operation system of an elevator for controlling operations of a plurality of elevators serving a plurality of floors, the energy-saving operation system of an elevator comprising: a power profile calculation device for obtaining a temporal change in the power value of each elevator as a power profile based on at least one of the direction of the elevator car, the hall call, the car call, the number of passengers, and the traffic information of the building; and a power suppression value calculation device that calculates a total power suppression value that suppresses the total used power value to a threshold value or less from a total power variation curve obtained by summing the power variation curves, and calculates the total power suppression value as a power suppression value for each of the elevators, each of which performs energy saving operation based on the power suppression value.

Drawings

FIG. 1 is a block diagram illustrating an embodiment of the present invention.

Fig. 2 is a block diagram showing an example of the structure of an elevator according to an embodiment.

Fig. 3 is a graph showing a power change curve before modification of the embodiment.

Fig. 4 is a table showing an example of calculation of the predicted wait time and the power suppression value according to the embodiment.

Fig. 5 is a graph showing a modified power change curve according to an embodiment.

Fig. 6 is a block diagram showing a power receiving apparatus according to an embodiment.

Fig. 7 is a block diagram showing another embodiment of the present invention.

Fig. 8 is a graph showing elevator speed and a ratio of acceleration to time according to an embodiment.

Fig. 9 is an explanatory diagram showing a relationship between a state and a speed of an elevator according to an embodiment.

Fig. 10 is a block diagram showing still another embodiment of the present invention.

Description of the symbols

20-comprehensive control device

201-Elevator specification and building specification data storage device

202-device for accumulating data relating to the operation of each elevator

203-power change curve calculating device of each elevator

204-total power change curve calculation device

205-total power suppression value calculating device

206-threshold setting device

207-predicted latency calculation device

208-passenger number calculating device

209-predicted ride time calculation device

210-power suppression value allocation index calculation device for each elevator

211-power suppression value calculating device for each elevator

300-building total power management device

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows an example of a configuration of an elevator control system that controls the operation of each elevator so that the total power of a plurality of elevators is always kept at or below a predetermined upper limit value.

The total power suppression value calculation device calculates a total power suppression value for suppressing the total power of each elevator to a predetermined upper limit value or less (total power suppression value calculation device 205), calculates a power suppression value assignment index for assigning the suppression value to each elevator (power suppression value assignment index calculation device 210 for each elevator) based on the waiting time of the hall call received by each elevator, and calculates the power suppression value for each elevator from the total power suppression value based on the power suppression value assignment index (power suppression value calculation device 211 for each elevator).

Fig. 2 shows a structure of 3 elevators, in which elevator No. 1 is an elevator car 11, elevator No. 2 is an elevator car 12, and elevator No. 3 is an elevator car 13, and information on each elevator car (a destination floor call registered in the elevator car, a load or number of passengers in the elevator car, an open/close state of an elevator door, and the like) and hall call information (direction, registration time) input through hall buttons (41, 42, 43) are transmitted to the integrated control device 20. The integrated control device 20 adjusts the maximum power by controlling the operation (maximum speed, acceleration, stop time) of each elevator.

The group management device comprehensively controls the operation of a plurality of elevators, and the comprehensive control device 20 of fig. 2 may be included in the group management device or may be included in another device. For example, a plurality of elevators are installed in a building, and the operation of each elevator may be controlled by the integrated control device 20 when the elevators are not subjected to group management control.

Further, the integrated control device 20 transmits a command for operation control to the control devices of the elevators (the control device 31 of the elevator No. 1, the control device 32 of the elevator No. 2, and the control device 33 of the elevator No. 3) so as to adjust the power of the elevators.

The integrated control device 20 of fig. 1 will be described in detail below.

The elevator specification and building specification data storage device 201 stores elevator specifications (rated speed, acceleration, rated load capacity, and the like), and building specifications (number of floors, floor interval, number of elevators, and the like). The operation-related data storage device 202 of each elevator stores therein elevator car operation data (speed, direction, etc.) collected from the control device of each elevator, the elevator car, and the elevator lobby of each floor, elevator lobby call data, elevator car call data, passenger number data, predicted arrival time data of each elevator car at each floor, and elevator lobby call duration data (elapsed time from elevator lobby call registration).

The power change curve calculation device 203 of each elevator calculates the power change curve of each elevator at the current time point with respect to the time after that, based on the data stored in the elevator specification and building specification data storage device and the data stored in the operation-related data storage device of each elevator. The power change curve indicates a change with time in the value of power (in W) used by the elevator, and a specific example of the power change curve is shown in fig. 3.

The power curve after the current point in time is calculated from at least any one of the rising or falling direction of the elevator car, the speed, the acceleration, the number of passengers, the elevator hall call and the elevator car call (excluding the call that did not occur) at the current point in time.

The total power variation curve calculation device 204 calculates a total power variation curve (total power variation curve) by summing the power variation curves of the elevators.

Total power suppression value calculation means 205 detects the maximum power value of the total power variation curve, compares the maximum power value with a threshold value (set by threshold value setting means 206), and calculates a total power suppression value, which is a power value that needs to be suppressed, from the difference between the maximum power value and the threshold value when the maximum power value exceeds the threshold value. The threshold value is an upper limit value of the maximum power of the entire elevator, and is set, for example, according to the power capacities of the power receiving devices of all elevators.

The lower 3 graphs of fig. 3 illustrate power change curves of elevator No. 1, elevator No. 2, and elevator No. 3, respectively. Shown in these figures are the power profiles for the future 60 seconds. The vertical axis represents the power value, and the unit of the power value is represented not by W (watts) but by normalization processing with the power at the rated speed (corresponding to the highest speed) being 100. The uppermost graph in fig. 3 shows a total power change curve of 3 elevators, and since the maximum power is 370 with respect to the upper limit threshold 250 of power, the difference between the two, i.e., the total power suppression value, is 120. During energy saving operation, the suppression value 120 is assigned to each elevator so that the maximum value of the total power is controlled to 250 or less.

A method of calculating the power change curve of each elevator will be described below with reference to fig. 8.

The curve of the traveling speed of the elevator traveling to the stop position (fig. 8(a)) and the curve of the acceleration (fig. 8(b)) are generated from the position, speed, direction of the elevator car of each elevator at the departure time and the position at which the elevator stops next time.

The next stopping position of the elevator is determined on the basis of the elevator lobby call or the elevator car call that is closest to the elevator position at the present moment. From the velocity v (t) (in m/s) and the acceleration a (t) (in m/s) at each point in time t, which can be derived from the velocity curve and the acceleration curve²) The power p (t) at each time point can be calculated by the following equation.

P(t)＝v(t)·[(Mc+Mw+Mp)·α(t)+ΔMu·g]…(1)

Wherein Mc represents the weight of the elevator car (excluding passengers, in kg),

mw represents the weight of the balancing weight,

mp represents the total weight (load capacity) of the passenger,

Δ Mu denotes the unbalance weight (the difference between the total weight of the elevator car including the passengers and the weight of the balance weight),

g represents the acceleration of gravity (9.8 m/s)²)。

The unbalanced weight Δ Mu can be obtained from Δ Mu ═ (Mc + Mp) -Mw. Mc and Mw are constant values determined according to elevator specifications, and Mp is a predicted passenger weight (predicted load capacity) calculated from a load sensor value (load capacity) of an elevator car or a predicted number of passengers that can be predicted from traffic information of a building. Alternatively, Mp may be set according to the number of passengersOr predicting the load capacity calculated by multiplying the number of passengers by the average weight. The unit of the power P (t) is obtained from the formula (1) and is kg.m²/s³N · m/s J/s W. By calculating the power p (t) at each time t, the power curve shown in fig. 3 can be determined.

The calculation of the power profile when there is an allocated hall call that has not yet been responded to is described below with reference to fig. 9.

Fig. 9(a) shows a situation of an elevator which has received an allocated hall call which has not been responded. In the figure, the elevator is at 6 floors, is traveling downward, and receives an unresponsive hall call in the ascending direction occurring at 1 floor. The predicted arrival time to layer 1 is 15 seconds. Fig. 9(b) is a diagram showing prediction of an elevator car call derived from an unresponsive elevator hall call. The figure predicts the occurrence of an elevator car call at floor 10. In the prediction of the derived elevator car call, the data having the highest probability may be selected from the past statistical data, or the end floor (uppermost floor or lowermost floor) may be selected.

Fig. 9(c) shows an example of a prediction of a speed profile predicted from fig. 9(b) for an unresponsive hall call and a derived car call. The elevator arrives at floor 1 after 15 seconds from the current time point, passengers who do not respond to the elevator hall call take the elevator (the stop time is 10 seconds), starts from floor 1 after 25 seconds from the current time point, and stops after traveling to floor 10 from which the elevator car calls after 85 seconds. The acceleration curve can be obtained from fig. 9(c) as in fig. 8(b), and the load capacity can be predicted from past statistical data, for example, from the average number of passengers on each floor in the time zone or the traffic flow. Therefore, even when there is an allocated hall call that has not yet responded, the power change curve can be calculated according to equation (1) by calculating the predicted data such as the velocity curve and the acceleration curve and obtaining the predicted value of the load capacity.

The dispensing method is explained below with reference to fig. 1. The power suppression is performed based on the service index (e.g., waiting time) of each elevator so that the power suppression amount is larger as the service index of the elevator is better.

The predicted waiting time calculation device 207 of fig. 1 calculates the predicted waiting time of the hall call accepted by each elevator. The predicted wait time is calculated from the sum of the time elapsed since the landing time point of the elevator hall call and the predicted arrival time of the serving elevator car at the landing floor of the elevator hall call.

The passenger number calculating device 208 calculates the number of passengers in the elevator car of each elevator based on the number of passengers in the elevator car at the current time point (calculated based on the load value of the elevator car) or the predicted number of passengers obtained from the past data of the number of passengers getting on and off the elevator. The predicted riding time calculation device 209 calculates the predicted riding time of the passenger of each elevator based on the predicted arrival time of each elevator car at the passenger's destination floor (determined by the elevator car call).

The power suppression value allocation index calculation device 210 for each elevator calculates the power suppression value allocation index for each elevator as an allocation index that is an allocation ratio when the total power suppression value is allocated to each elevator, based on at least any one of the predicted waiting time of each elevator, the number of passengers in each elevator, and the predicted riding time of each elevator. For example, the longer the predicted waiting time of the elevator is, the smaller the allocation index (allocation ratio) is set, that is, the power suppression value is reduced. Thus, since the degree of operation adjustment by power suppression can be made smaller for an elevator having a poor service quality for passengers, i.e., a long waiting time, than for other elevators, it is possible to prevent the service quality from being extremely degraded in a single elevator and in the entire elevator.

The power suppression value calculation device 211 for each elevator divides the total power suppression value into the elevators based on the power suppression value assignment index, and calculates the power suppression value for each elevator. The maximum speed or acceleration calculation device for each elevator obtains the maximum speed, acceleration or stop time of each elevator in energy saving operation, which is operation control, from the power suppression value of each elevator calculated by the power suppression value calculation device for each elevator, and transmits the obtained value to the control device for each elevator.

Fig. 4 shows a specific example of calculating the power suppression value assignment index from the predicted waiting time. The table of fig. 4 is set according to the situation of fig. 3, and the total power suppression value is 120. Therefore, the total power suppression value 120 is allocated to 3 elevators 1 to 3 elevators based on the predicted waiting time. The predicted waiting times for elevator No. 1, elevator No. 2, and elevator No. 3 were 50 seconds, 5 seconds, and 15 seconds, respectively.

The reciprocal of the ratio of the predicted waiting time (ratio to the total value) of each elevator is calculated. For example, for elevator number 1, the value is calculated from 1/{50/(50+5+15) }, and found to be 1.4. The values for elevator No. 2 and elevator No. 3 were also calculated as 14 and 4.7, respectively. Then, the inverse of the ratio of the predicted waiting time of each elevator is calculated as a ratio with respect to the whole. For example, in elevator No. 1, the value is calculated from 1.4/(1.4+14+4.7 — 20.1), and found to be 0.07. Similarly, the values of elevator No. 2 and elevator No. 3, which are the power suppression value assignment indices, are calculated to be 0.7 and 0.23, respectively. At the time of calculation, the power suppression value assignment index is calculated to be small according to the length of the prediction waiting time.

The power suppression values of the elevators are calculated by multiplying the total power suppression value by the power allocation index of each elevator, and the calculation results are 8, 84, and 28 (the total value satisfies 120). Since the predicted waiting time is 50 seconds and the predicted waiting time is long for elevator No. 1, the power suppression value of elevator No. 1 is set to 8, and thus the degradation of the elevator operation service quality due to power suppression can be avoided as much as possible. Since the predicted waiting time of elevator No. 2 is 5 seconds and the predicted waiting time is short, the power suppression value is set to 84, which is large.

Since the power suppression values of the elevators are determined according to the waiting time of the elevators so as to average the traveling service quality of the passengers (to avoid the occurrence of imbalance in the traveling service quality), the traveling service quality of each elevator is not greatly unbalanced as viewed by the passengers as a whole, and thus, good service can be provided to the passengers even in the energy saving mode.

The power change curve of fig. 5 is generated from fig. 4, and shows the power change curve of each elevator after the power suppression value of each elevator is determined, the maximum speed of each elevator in the graph has changed (only the speed has been changed here), the power change curve of each elevator is shown by the lower 3 curves of fig. 5, the total power change curve is shown by the uppermost curve of fig. 5, and the total power change curve is always controlled to be equal to or less than the threshold value.

As described above, the amount of the portion exceeding the upper limit value of the total power is obtained from the power variation curve of each elevator, the excess amount is distributed to each elevator as the power suppression value, and the maximum speed, acceleration, or stop time of each elevator is adjusted to perform the energy saving operation (operation), whereby the total power of a plurality of elevators at each time point can be surely suppressed to a predetermined value or less, and energy saving of the elevator system can be achieved.

Further, since the excess amount can be allocated in accordance with the service status of each elevator such as the waiting time shown in fig. 4, it is possible to limit the power of each elevator and to control the influence on the passengers of each elevator at each point in time to an appropriate state (to suppress imbalance in service quality).

In addition, although fig. 1 illustrates an example in which the power suppression value assignment index is calculated from a combination of the predicted waiting time, the number of passengers, and the predicted riding time, the same effect can be obtained by using at least one of these pieces of information.

For example, when the power suppression value assignment index is calculated from the predicted waiting time, since the waiting time is the service index most emphasized by the passenger, the power adjustment can be realized while suppressing the imbalance of the service (the degree of dissatisfaction is small) by determining the assignment index according to the waiting time.

On the other hand, when the power suppression value distribution index is calculated from the number of passengers, the power suppression value distribution index is determined from the number of persons affected by the power adjustment, so that the service quality of most persons can be controlled within an appropriate range at the time of the power adjustment.

When the power suppression value assignment index is calculated from the predicted riding time, it can be seen from the power change curve of elevator No. 2 in fig. 4 and 5 that the riding time becomes longer after the maximum speed is limited by the power adjustment when the power adjustment is performed, and therefore, the service quality can be controlled within an appropriate range in terms of the riding time most susceptible to the influence by the power adjustment.

Further, by combining arbitrary information of the predicted waiting time, the number of passengers, and the predicted riding time (for example, the predicted waiting time and the number of passengers), the service quality can be evaluated in more detail, and thus the combined service quality can be controlled within an appropriate range at the time of power adjustment. In addition, the same effect can be obtained by using the predicted arrival time of the hall call instead of the predicted waiting time.

The following supplementary description is made of energy saving by suppressing the total power of a plurality of elevators. When the total resistance value of the power line of the power receiving equipment of the building and the resistance of the transformer is Rt, the loss caused by the power line and the resistance of the transformer is Rt & i²And (4) showing. Wherein i represents the effective value of the current when the elevator works.

Rt.i when i is suppressed to 70%²50%, the loss is reduced by half. In fact, the operating time T is longer because the speed is reduced, but T is approximately inversely proportional to i, so that when i is suppressed to 70%, the time factor can be taken into accountLoss amount of element Rt.i²T is reduced to 70%.

Therefore, by suppressing the total power, it is possible to reduce the loss due to the electric wires, the transformer, and the like of the power receiving equipment of the building, and to achieve energy saving of the entire system. Further, since fluctuation of the amount of power generation can be suppressed from the power plant side on the power grid side, the power plant can be operated under an operating condition with good power generation efficiency, and can contribute to energy saving.

Fig. 6 shows a configuration of a power receiving device corresponding to a plurality of elevator systems. Power is supplied from the power receiving equipment in the whole building to the elevator master power receiving device a01 which is responsible for power reception of all elevators, and further, power is supplied to the power receiving devices (elevator No. 1 a02, elevator No. 2 a04, and elevator No. 3 a06) of the elevators through the elevator master power receiving device a01, and finally, power is supplied to the driving devices (elevator No. 1 a03, elevator No. 2 a05, and elevator No. 3 a07) of the elevators. In the case of the embodiment of the elevator control system shown in fig. 1, since the total power of all elevators can be kept at a predetermined value or less, the power capacity of the elevator total power receiving device can be kept low. For example, in the worst case of the simultaneous start of 3 elevators as shown in fig. 3 and 5, the total power capacity of the power receiving devices of the elevators is 450%, but as shown in fig. 5, the power capacity can be reduced to 55% because the power capacity can be always kept at 250. As a result, the cost of the power receiving device can be reduced, the space required for the power receiving device can be saved, and the power can be further averaged, thereby reducing the contract power of the building. In addition, as these buildings increase in size, the load fluctuation decreases and the CO becomes smaller as viewed from the power system side₂The use of a base load type generator with a low emission becomes more convenient.

Fig. 7 corresponds to fig. 1, and when the threshold setting device 206 sets the threshold, an appropriate threshold is set based on a signal from the building total power management device 300.

The building total power management device 300 manages the total power of the whole building so that the total power does not exceed a prescribed value at all times. For example, the total power of the whole building is detected in a period of 1 to 2 pm peak of 1 day peak of electricity consumption, a power threshold value of the whole elevator for controlling the total power to be equal to or less than a predetermined value is calculated based on the detected value, and the power threshold value is transmitted to the threshold value setting device 206, thereby performing power adjustment to control the power of each elevator to be equal to or less than the threshold value and avoid the service quality to passengers from being degraded.

As a result, since the total power of the building is always equal to or less than the predetermined value, the capacity of the power receiving device in the entire building can be reduced, and the contract power can also be reduced. In addition, as these buildings increase, the load fluctuations become smaller, and the CO₂The use of a low-emission base load type generator is facilitated, and thus it can contribute to the prevention of environmental problems such as global warming.

Fig. 10 corresponds to fig. 1, and fig. 10 is provided with a standby elevator detection device 213, a standby elevator use determination device 214, a standby elevator regenerative power value calculation device 215, and a standby elevator regenerative operation (regenerative operation) command device 216.

The standby elevator detection device 213 detects a standby elevator in a standby state (stopped state) in which an elevator hall call and an elevator car call are not received from each elevator. If there is a standby elevator, the standby elevator use determination device 214 determines to use the standby elevator if the total power suppression value calculation device 205 needs to suppress the total power to a predetermined value or less because the total power variation curve is equal to or greater than the threshold value.

The regenerative power value calculation device 215 of the standby elevator calculates the regenerative power value at the time of regenerative operation by driving the standby elevator that meets the condition. The regenerative power value is obtained as regenerative power in a period satisfying a condition or a maximum value of regenerative power by calculating a power variation curve. When a plurality of standby elevators meeting the conditions exist, the respective regenerative power values of the plurality of elevators are respectively calculated.

The calculated regenerative power value is input to power suppression value calculation device 211 of each elevator. The power suppression value calculation device 211 for each elevator calculates the power suppression value for each elevator by using, as a new total power suppression value, a value obtained by subtracting the regenerative power generated by the operation of the standby elevator (the total value thereof when there are a plurality of standby elevators) from the total power suppression value. When the standby elevator use determination device 214 determines that the standby elevator is used, the standby elevator regenerative operation command device 216 transmits a command of the traveling direction and speed of the elevator car to the control device, and causes the elevator in the standby state meeting the condition to perform regenerative operation.

In the system shown in fig. 1 and 7, when the total power change curve of each elevator exceeds a predetermined value, the power is controlled by adjusting only the speed or acceleration of each elevator so that the total power change curve is equal to or less than the predetermined value, whereas in the system shown in fig. 10, the total power can be reduced without affecting the service quality of each elevator because the regenerative operation is performed by the standby elevator. In addition, since the motor serves as a generator to generate power when the elevator is in the regenerative operation, the power consumption of the entire elevator can be reduced. Since the standby elevator is in a no-load state (load is zero), a regenerative operation state is established when the elevator car is operated in the upward direction.

Claims (6)

1. An energy-saving operation system of an elevator for controlling the operation of an elevator serving a plurality of floors,

determining the power suppression value of each of the elevators based on a total power suppression value in which a total used power value obtained by summing used power values of a plurality of the elevators is equal to or less than a threshold value,

determining a ratio of the power suppression value to the total used power suppression value based on at least any one of service indexes of a predicted waiting time of the elevator, a number of passengers of the elevator, and a predicted riding time of the elevator, the elevator adjusting a maximum speed, an acceleration, or a stop time of each elevator based on the power suppression value to perform a saving run.

2. An energy-saving operation system of an elevator, which is used for controlling the operation of a plurality of elevators for providing service for a plurality of floors,

comprising: a power change curve calculation device which obtains a temporal change of a power value used by each elevator as a power change curve based on at least any one of a direction of an elevator car, a hall call, a car call, a number of passengers, and traffic information of a building; and

a power suppression value calculation device that calculates a total power suppression value by which a total used power value is equal to or less than a threshold value from a total power variation curve obtained by summing the power variation curves and calculates the total power suppression value as a power suppression value for each of the elevators,

determining a ratio of the power suppression value to the total used power suppression value based on at least any one of service indexes of a predicted waiting time of the elevator, a number of passengers of the elevator, and a predicted riding time of the elevator, the elevator adjusting a maximum speed, an acceleration, or a stop time of each elevator based on the power suppression value to perform a saving run.

3. Energy-efficient operation system of an elevator according to claim 1 or 2,

the threshold value is determined according to the power capacity of the powered device of the elevator.

4. Energy-efficient operation system of an elevator according to claim 1 or 2,

the threshold value is determined based on a power capacity specified by a building total power management device that manages a total power value of the building.

5. Energy-efficient operation system of an elevator according to claim 1 or 2,

the power usage value of each elevator is calculated according to the position, speed and direction of each elevator car at the departure time, the speed, acceleration of the elevator running to the next stop position, the weight of the elevator car, the weight of the counterweight and the total weight of passengers.

6. Energy-efficient operation system of an elevator according to claim 1 or 2,

and enabling the elevator in the standby state to perform regenerative operation.