JP6943201B2 - Inverter system and inverter control method - Google Patents

Description

The present invention relates to the technology of an inverter system and a control method, and relates to, for example, drive control of a motor applicable to a hoist that raises and lowers an elevator basket.

For example, in a motor applicable to a hoist that raises and lowers a basket of a rope type elevator, it is known that an inverter controls operation according to information such as the load of the basket and the destination floor. For example, there is a configuration in which the motor is driven by power from the system power supply side, or the motor is regeneratively operated to drive and control the motor to generate regenerative electric power.

Further, in the case of a configuration in which a storage battery is provided in the inverter, energy saving measures are taken by, for example, storing the regenerated power by the regenerative operation in the storage battery or regenerating the regenerated power to the system power supply side. Further, in the event of a power failure on the system power supply side, the storage battery can be applied as an emergency power source to drive the motor by power running (for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2005-145678 Japanese Unexamined Patent Publication No. 2013-234029 Japanese Unexamined Patent Publication No. 2006-94683

In the configuration in which the storage battery is provided in the inverter as described above, when the storage battery capacity is equal to or higher than a predetermined value (when fully charged, etc.) and the system power supply side is in a power failure state, the regenerative power is stored in the storage battery. However, there is a risk that it will not be possible to regenerate to the grid power supply side. In such a case, it is conceivable that the regenerative operation will be hindered (regeneration expired, etc.).

As a method of suppressing the above-mentioned situation, a device such as a resistor for power consumption or a changeover switch (hereinafter, simply referred to as a device for power consumption) is provided in advance, and regenerative power is consumed (for example, heat is generated by the resistor). It can be mentioned that it is configured so that it can be regenerated.

However, when the above-mentioned power consuming device is provided, for example, the configuration may become large and the cost may increase. In addition, since the consumption of regenerative power can be a mere power loss, energy saving measures may be insufficient.

The present invention has been made in view of such technical problems, and an object of the present invention is to provide a technique capable of contributing to simplification of a configuration and energy saving measures.

One aspect of the present invention is connected to a regenerative converter unit that converts AC power from a grid power source into DC power and a regenerative converter unit via a DC bus, and drives and controls a motor that moves an inverter basket. , An inverter unit that drives or regenerates the motor, and a charge / discharge unit that has a buck-boost chopper circuit connected to the DC bus and charges and discharges a storage battery connected to the buck-boost chopper circuit. Based on the detection unit that detects the storage battery capacity and basket state of the storage battery during the first period of operation from the state when the inverter door is switched to the closed state to the time before the motor is operated, and the detection result by the detection unit during the first period of operation. It is equipped with a pre-operation control unit that controls the charging / discharging unit to adjust the storage battery capacity, and the basket state is the weight of the basket, the nearest destination floor that has been set, and between each floor up to the destination floor. It is an inverter system characterized by including the longest inter-floor distance.

In addition, the pre-operation control unit so that the estimation unit that estimates the estimated value of the regenerative power amount in the case of regenerative operation between the floors with the longest inter-floor distance and the adjusted storage battery capacity satisfy the following equation (1). In addition, it may be characterized in that it is provided with a capacity adjusting unit for discharging the electric power of the storage battery.

(Adjusted storage battery capacity) ≤ (Fully charged storage battery capacity)-(Estimated value of regenerative power) (1)
Further, the pre-operation control unit is further provided with a comparison determination unit that compares the detection value of the storage battery capacity by the detection unit with a preset threshold value to determine the necessity of adjusting the storage battery capacity. It may be something to do.

In addition, the elevator has a configuration in which a basket and a weight for balancing are suspended in a fishing bottle style by a lifting rope wound around a drive sheave that rotates in conjunction with a motor, and the elevator is lifted and lowered in a capacity adjusting section. The current command value of the pressure chopper circuit may be calculated by the following equation (4).
I ^* = k × (abs (Mm) × gH) / (V × t) (4)
In equation (4), I ^* is the current command value for which the discharge direction is positive, k is the coefficient considering power loss (k ≦ 1), M is the weight of the weight, m is the weight of the basket, g is the gravitational acceleration, and H is. The longest inter-floor distance between each floor. V is the storage battery voltage, t is the discharge time, and abs (Mm) is the absolute value of (Mm).

Another aspect is a motor that moves the basket of the elevator by a power supply process that converts AC power from the grid power supply into DC power by the rechargeable converter unit and an inverter unit that is connected to the rechargeable converter unit via the DC bus. The storage battery connected to the buck-boost chopper circuit is controlled by the operation process of driving and regenerating the motor by driving and controlling the motor, and the charge / discharge unit having the buck-boost chopper circuit connected to the DC bus. It has a charge / discharge process of charging / discharging, and detects the storage battery capacity and basket state of the storage battery in the pre-operation period from when the inverter door in the open state is switched to the closed state to before the motor is operated by the operation process. It has a detection process and a pre-operation control process that controls the charge / discharge unit based on the detection result of the detection process to adjust the storage battery capacity, and the basket state is the basket weight and the nearest destination set. It is an inverter control method characterized by including the floor and the longest inter-floor distance among the floors up to the destination floor.

In the pre-operation control process, the estimation process for estimating the estimated value of the regenerative power amount in the case of regenerative operation between the floors with the longest inter-floor distance and the adjusted storage battery capacity satisfy the following equation (1). In addition, it may be characterized by having a capacity adjusting process for discharging the electric power of the storage battery.
(Adjusted storage battery capacity) ≤ (Fully charged storage battery capacity)-(Estimated value of regenerative power) (1)
Further, the pre-operation control process is further characterized by having a comparative determination process of comparing the detected value of the storage battery capacity by the detection process with a preset threshold value to determine the necessity of adjusting the storage battery capacity. It may be the one.

As shown above, according to the present invention, it is possible to contribute to simplification of the configuration and energy saving measures.

The schematic block diagram for demonstrating the inverter system 1 which is an example of this Embodiment. A schematic configuration diagram for explaining the rope type elevator 2 ((A) is the case where the weight of the basket <the weight of the weight 21 and (B) is the case where the weight of the basket> the weight of the weight 21). The flowchart which shows an example of the inverter control method of the inverter system 1.

The inverter system and the inverter control method in the embodiment of the present invention are completely different from the configuration in which the inverter is provided with a storage battery or a power consumption device (hereinafter, simply referred to as a conventional configuration).

That is, in the present embodiment, the storage battery capacity and the basket state (with the basket weight) are in the period from when the elevator door in the open state is switched to the closed state to before the motor is operated (hereinafter, simply referred to as a pre-operation period). , Detects the set nearest destination floor and the longest inter-floor distance (distance in the moving direction of the basket) between each floor up to the destination floor, and adjusts the storage battery capacity based on the detection result. Is.

A configuration different from this embodiment, for example, a conventional configuration in which a power consumption device is provided as shown in Patent Document 2 (for example, a configuration including a resistor and a semiconductor switch shown by reference numerals 6 and 7 in FIG. 5 of Patent Document 2). In the case of), even if the storage battery is fully charged (the storage battery capacity is equal to or higher than the specified value) and the system power supply side has a power failure, the motor can be regeneratively operated so that the power consumption device consumes the regenerative power. It becomes. However, since the device for power consumption is provided, there is a risk that the configuration will be large and the cost will be high. In addition, energy saving measures may be insufficient because the configuration may simply consume regenerative power.

On the other hand, in the case of the configuration in which the storage battery capacity is adjusted during the first period of operation as in the present embodiment, the estimated value of the regenerative power amount when the longest inter-floor distance among the floors up to the destination floor is regeneratively operated is obtained in advance. It is possible to estimate and form a free capacity in the storage battery that is the size of the estimated value.

In the configuration for adjusting the storage battery capacity, for example, the estimated value of the regenerative power amount in the case of regenerative operation between the floors having the longest inter-floor distance is estimated so that the adjusted storage battery capacity satisfies the following equation (1). In addition, a configuration for discharging the electric power of the storage battery (for example, a configuration including an estimation unit 16a and a capacity adjustment unit 16b described later) can be mentioned.

(Battery capacity) ≤ (Battery capacity in a fully charged state)-(Estimated value of regenerative power) (1)
If the configuration is such that the storage battery capacity can be adjusted as in the present embodiment, it is possible to suppress a situation in which regenerative operation is hindered (regeneration expiration, etc.) even if the configuration is not provided with a power consumption device. .. For example, even if the system power supply side has a power failure (power failure at the position between the adjacent floors) while the motor is being regenerated to move the basket to the destination floor, the regenerative power will be absorbed by the storage battery. You can regenerate and move the basket to the nearest floor.

Further, since the power consumption device as in the conventional configuration is unnecessary, the configuration can be simplified, and it is possible to contribute to, for example, miniaturization and cost reduction of the configuration. Further, in the regenerative power, it is not necessary to simply consume the power consumption device, so that the power loss can be suppressed and it is possible to contribute to the energy saving measures.

The inverter system and control method of the present embodiment have various fields (for example, inverter technology, converter technology, motor technology, elevator technology) in various fields (for example, inverter technology, converter technology, motor technology, elevator technology) as long as the storage battery capacity can be adjusted before the motor is operated as described above. It is possible to design by appropriately applying the technical common knowledge of (fields such as), and the following is an example.

<< Configuration example of the inverter system according to this embodiment >>
The inverter system 1 according to the embodiment of the present embodiment shown in FIG. 1 has a plurality of functional units (details will be described later), and is, for example, a rope-type elevator 2 as shown in FIG. 2 (details will be described later). The motor 3 of the hoisting machine 30 is driven and controlled, and the motor 3 is driven or regenerated according to the cage state of the basket 20 and the storage battery capacity of the storage battery 4 described later.

Among the functional units of the inverter system 1, the regenerative converter unit 11 converts AC power from a system power source (for example, a commercial power source for driving a three-phase AC power source or the like) 10 into DC power. The inverter unit 12 is connected to the regenerative converter unit 11 via the DC bus 10a, converts the DC power converted by the regenerative converter unit 11 into AC power, and drives the motor 3 that moves the basket 20. The motor 3 is controlled to perform power running operation or regenerative operation. In the DC bus 10a, various devices may be appropriately provided, and for example, as shown in FIG. 1, a DC capacitor 10b for smoothing may be provided.

The charging / discharging unit 13 has a buck-boost chopper circuit 14 connected to the DC bus 10a, and the storage battery 4 connected to the buck-boost chopper circuit 14 is used to boost the buck-boost chopper circuit 14. It is charged and discharged by the step-down function.

The step-up and step-down functions of the buck-boost chopper circuit 14 can be carried out by appropriately applying various techniques, and one example thereof is the application of techniques such as current control shown in Patent Document 3. .. Specifically, when the storage battery 4 is discharged, the buck-boost chopper circuit 14 is controlled (controlled to boost the voltage) based on the current command value, and the regenerative converter unit 11 is PWM-modulated (pulse width modulation). As a result, the electric power of the storage battery 4 can be discharged and regenerated to the system power supply 10 side. The amount of electric power generated by discharge can be calculated by the following formula (2).

W1 = V × I × t (2)
In the formula (2), W1 is the amount of electric power due to discharge, V is the storage battery voltage, I is the discharge current, and t is the discharge time.

Further, by controlling the buck-boost chopper circuit 14 based on the current command value (controlling the step-down operation) and performing PWM modulation control of the inverter unit 12, the regenerative power generated by the regenerative operation of the motor 3 is stored in the storage battery 4. be able to. For example, in the elevator 2, as shown in FIG. 2, in the case of a configuration in which the basket 20 and the weight 21 for balancing are suspended in a fishing bottle type (traction type configuration; hereinafter, simply referred to as a suspended configuration). The amount of regenerated power can be calculated based on the following equation (3).

W2 = (Mm) x gH (3)
In addition, W2 of the formula (3) is the electric energy by the operation of the motor 3 (power running operation or regenerative operation), M is the weight of the weight 21, m is the weight of the basket, g is the gravitational acceleration, and H is the moving length of the basket 20 ( Height in the ascending / descending direction).

Further, when the elevator 2 has a suspension configuration as shown in FIG. 2, the current command value of the buck-boost chopper circuit 14 is calculated by the following equation (4) based on the equations (2) and (3). Can be done.

I ^* = k × (abs (Mm) × gH) / (V × t) (4)
In the equation (4), I ^* is the current command value in which the discharge direction is positive, k is a coefficient in consideration of power loss, and abs (Mm) is the absolute value of (Mm). The coefficient k is a coefficient in consideration of the loss generated in the motor 3 and the inverter unit 12 during the regenerative operation of the motor 3, and a value satisfying k ≦ 1 is set. Specifically, the setting may be made based on the loss measurement test results of the motor 3 and the inverter unit 12.

The electric power stored in the storage battery 4 can be used for various purposes as well as simply regenerating to the system power supply 10 side as described above. For example, when the system power supply 10 side is in a power failure state, the inverter unit It is possible to supply the 12 and the motor 3 as appropriate.

The detection unit 15 detects the storage battery capacity and the basket state of the storage battery 4 during the pre-operation period (the period after the elevator door in the open state is switched to the closed state and before the motor 3 is operated by the inverter unit 12). It is a thing. The storage battery capacity can be derived by detecting the output voltage of the storage battery 4 (for example, the storage battery capacity can be derived by appropriately using a data sheet containing a graph showing the relationship between the output voltage of the storage battery and the capacity). be. Further, for example, by setting an arbitrary threshold value in the detection value (output voltage value) of the storage battery capacity, if the detection value is less than the threshold value, it is assumed that the free capacity of the storage battery 4 is large, and the detection value. When is greater than or equal to the threshold value, it can be considered that the free capacity of the storage battery 4 is small (for example, a fully charged state).

In the contents of the basket state, the weight of the basket (the weight of the basket 20 itself and the weight of the load caused by people or objects in the basket 20) and the nearest destination set (for example, set via the operation panel in the basket 20). It is assumed that the floor and the longest inter-floor distance among the floors (adjacent floors) up to the destination floor are included.

For example, assume that the elevator 2 is installed in a five-story building, the distance between the first floor to the second floor and the third floor to the fifth floor is 3 m, and the distance between the second floor to the third floor is 4 m. If the destination floor of the basket 20 stopped on the 5th floor is set to the 1st and 2nd floors, it will be between the 2nd and 3rd floors.

In the detection of the car state, the car 20 of the elevator 2 is stopped at a desired floor and the elevator door (for example, a door that opens and closes appropriately at the landing on each floor; not shown) is opened, and then the elevator door is closed. The basket state is detected during the period from switching to to before operating the motor 3 (that is, the period before operation). If the car is in such a basket state detected during the first period of operation, it is considered that the weight of the car does not change unless, for example, the elevator door is switched to the open state again and a person or an object enters or exits the car 20. Can be done.

Various configurations can be applied to the detection unit 15, and the detection unit 15 is not particularly limited. For example, in the configuration for detecting the capacity of the storage battery, a configuration using a voltmeter for appropriately detecting the output voltage of the storage battery 4 can be mentioned. Further, the configuration for detecting the cage state may include, for example, a configuration for appropriately detecting the cage state via a sensor installed in the cage 20 of the elevator 2. As a specific example, the load weight in the basket 20 is detected via a load measuring device (not shown) provided on the bottom side of the basket 20, and the destination floor of the basket 20 is determined by the operation panel in the basket 20. There is a configuration to detect via.

The pre-operation control unit 16 includes an estimation unit 16a and a capacity adjustment unit 16b, which will be described later, and controls the charge / discharge unit 13 based on the detection result by the detection unit 15 during the first period of operation to control the storage battery capacity. Is to adjust.

The estimation unit 16a estimates the estimated value of the regenerative electric energy in the case of regenerative operation between the floors having the longest inter-floor distance, based on the basket state detected by the detection unit 15. When the elevator 2 has a suspension configuration as shown in FIG. 2, the estimated value of the regenerative electric energy can be appropriately estimated based on the equation (3) and the basket state. The longest inter-floor distance described above is set in H of the equation (3).

The capacity adjusting unit 16b appropriately discharges the power of the storage battery 4 (discharges via the buck-boost chopper circuit 14) so as to satisfy the equation (1) based on the estimated value of the regenerative electric energy by the estimation unit 16a. It adjusts the storage battery capacity. When the elevator 2 has a suspension configuration as shown in FIG. 2, the current command value can be calculated by setting the discharge time t of the equation (4) so as to satisfy the equation (1). Then, by controlling the buck-boost chopper circuit 14 based on the calculated current command value and performing PWM modulation control of the regenerative converter unit 11, the power of the storage battery 4 can be discharged and regenerated to the system power supply 10 side.

The pre-operation control unit 16 may include various functional units in addition to the estimation unit 16a and the capacitance adjusting unit 16b as described above, and may include, for example, a comparison determination unit 16c as shown below.

The comparison determination unit 16c shown in FIG. 1 compares the detection value of the storage battery capacity by the detection unit 15 with an arbitrary threshold value, and determines whether or not the storage battery capacity needs to be adjusted based on the comparison result. The threshold value can be set as appropriate and is not particularly limited. For example, the motor 3 is regeneratively operated under various conditions in advance, the regenerative power that can be generated by the regenerative operation is analyzed, and a threshold value is set on the assumption that the regenerative power is stored in the storage battery 4 for each regenerative operation. To do.

By setting the threshold value of the comparison determination unit 16c as described above, for example, when it is determined that the detected value of the storage battery capacity is less than the threshold value, it is considered that the storage battery capacity already satisfies the equation (1). You can also do it. Further, when it is considered that the storage battery capacity already satisfies the equation (1), the estimation of the estimated value of the regenerative electric energy by the estimation unit 16a and the discharge by the capacity adjustment unit 16b may be omitted as appropriate.

≪Elevator configuration example≫
In the rope-type elevator 2 shown in FIG. 2, a hoistway 2a in which the basket 20 and the weight 21 for balancing can be raised and lowered in the vertical direction, and a hoisting machine 30 located above the hoistway 2a are installed. The structure mainly includes a machine room 2b.

The hoisting machine 30 has a motor 3 and a drive sheave 31 (a sheave that rotates in conjunction with the rotor of the motor 3), and a lifting rope 22 is wound around the drive sheave 31. There is. A basket 20 is provided on one end side of the elevating rope 22, and a weight 21 is provided on the other end side to form a suspension structure. With such a suspension configuration, when the drive sheave 31 rotates, the basket 20 and the weight 21 move up and down in the hoistway 2a in opposite directions.

For example, the weight 21 may be set so as to be balanced with the basket 20 (set so that the weight of the basket and the weight of the weight 21 are substantially equal) in a state where half of the passengers are in the basket 20. As a result, the operating state of the motor 3 also differs depending on the passenger occupancy rate of the basket 20 and the moving direction (driving direction) of the basket 20.

For example, as shown in FIG. 2A, when the weight of the basket 20 including the passengers is lighter than the weight of the weight 21 (for example, in a no-load state in which no passengers are in the basket 20). When the car 20 rises, the regenerative operation converts the velocity energy into electric power, and when the basket 20 descends, the power running operation consumes the electric power. On the other hand, as shown in FIG. 2B, when the weight of the basket including passengers is heavier than the weight of the weight 21 (for example, the rated load acts when a capacity of people rides in the basket 20). In the rated load state), the power running operation is performed when the car 20 is raised, and the regenerative operation is performed when the car 20 is lowered.

≪Example of inverter control method≫
The inverter system 1 applied to the elevator 2 as shown in FIG. 2 may, for example, control the inverter through the processes S1 to S5 as shown in FIG. 3 to perform power running operation or regenerative operation of the motor 3.

<When the system power supply 10 is normal (non-power failure state)>
When the destination floor is set in the basket 20 of the elevator 2, the detection unit 15 first detects the storage battery capacity and the basket state of the storage battery 4 in the pre-operation period by the detection process S1 shown in FIG. Based on the detection result of the detection process S1, it is determined whether the operation of the motor 3 is either power running operation or regenerative operation.

Next, in the pre-operation control process S2, the pre-operation control unit 16 controls the charge / discharge unit 13 to adjust the storage battery capacity of the storage battery 4. In the pre-operation control process S2, first, in the comparison determination process S21, the comparison determination unit 16c compares the detected value of the storage battery capacity by the detection unit 15 with an arbitrary threshold value, and adjusts the storage battery capacity based on the comparison result. Judge the necessity. In this comparison determination process S21, if it is determined that the detected value of the storage battery capacity is equal to or greater than the threshold value and the storage battery capacity does not satisfy the equation (1), and it is determined that the storage battery capacity needs to be adjusted, the process proceeds to the estimation process S22. ..

In the estimation process S22, the estimation unit 16a estimates the estimated value of the regenerative electric energy when the regenerative operation is performed between the floors having the longest inter-floor distance. Then, in the capacity adjustment process S23, the capacity adjustment unit 16b controls the buck-boost chopper circuit 14 of the charge / discharge unit 13 to perform a boost operation so that the adjusted storage battery capacity satisfies the equation (1), and the regenerative converter. By controlling the unit 11 by PWM modulation, the electric power of the storage battery 4 is discharged and regenerated to the system power supply 10 side. As the current command value used for controlling the buck-boost chopper circuit 14, the value obtained by setting the discharge time t of the equation (4) so as to satisfy the equation (1) is applied.

After that, in the power supply process S3, the regenerative converter unit 11 converts the AC power from the system power supply (for example, a commercial power source for driving a three-phase AC power supply or the like) 10 into DC power, and in the operation process S4, the inverter unit 12 However, the DC power is converted into AC power, the motor 3 is driven and controlled to operate, and the basket 20 starts moving to the destination floor. When the operation of the motor 3 is a regenerative operation, the regenerative power generated by the regenerative operation is regenerated to the system power supply 10 side via the regenerative converter unit 11, or the charge / discharge unit 13 is transferred to the inverter unit 12 and the inverter unit 12 by the charge / discharge process S5. The storage battery 4 is charged with electricity via the buck-boost chopper circuit 14. Then, after the basket 20 arrives at the destination floor, the operation of the motor 3 ends.

If it is determined in the comparison determination process S21 that the detected value of the storage battery capacity is less than the threshold value, the storage battery capacity already satisfies the equation (1), and the adjustment of the storage battery capacity is unnecessary, the estimation process S22 , The capacity adjustment process S23 may be omitted, and the process may proceed to the power supply process S3 in the subsequent stage.

<When the system power supply 10 has a power failure in the operation process S4>
When a power failure occurs on the system power supply 10 side in the middle of the operation process S4 and the operation of the motor 3 is stopped, first, the system power supply 10 side is disconnected from the inverter system 1, and the power of the storage battery 4 is transferred to the inverter unit 12 and the motor 3. Power is supplied to the inverter and the operation for moving the basket 20 to the nearest floor is started. The regenerative power generated at this time is stored in the storage battery 4 by the charge / discharge unit 13 via the inverter unit 12 and the buck-boost chopper circuit 14 in the charge / discharge process S5. Then, after the basket 20 arrives at the nearest floor, the operation of the motor 3 ends.

Although the above description has been made in detail only with respect to the specific examples described in the present invention, it is clear to those skilled in the art that various changes and the like can be made within the scope of the technical idea of the present invention. It goes without saying that such changes belong to the scope of claims.

For example, in the inverter system 1, the case where it is applied to the elevator 2 having the configuration shown in FIG. 2 has been specifically described, but it can also be applied to elevators having various other configurations. For example, even if the hoisting machine 30 is provided in the hoistway 2a or the hoisting machine 30 is a hoisting machine type without using the weight 21, the motor 3 can be appropriately driven and controlled to perform power running operation or regenerative operation. good. The use of the elevator 2 is not particularly limited, and various uses such as for passengers, passengers, berths, luggage, and automobiles can be mentioned.

1 ... Inverter system 10 ... System power supply 11 ... Regenerative converter unit 12 ... Inverter unit 13 ... Charging / discharging unit 14 ... Buck-boost chopper circuit 15 ... Detection unit 16 ... Pre-operation control unit 16a ... Estimating unit 16b ... Capacity adjustment unit 16c ... Comparison Judgment unit 20 ... Basket 3 ... Motor 4 ... Storage battery

Claims (7)

A regenerative converter that converts AC power from the grid power supply to DC power,
An inverter unit that is connected to the regenerative converter unit via a DC bus and drives and controls a motor that moves the elevator cage to power or regenerate the motor.
A charge / discharge unit that has a buck-boost chopper circuit connected to the DC bus and charges / discharges the storage battery connected to the buck-boost chopper circuit.
A detector that detects the storage battery capacity and basket state of the storage battery during the first period of operation from when the elevator door in the open state is switched to the closed state until before the motor is operated.
During the first half of operation, the pre-operation control unit that controls the charge / discharge unit based on the detection result by the detection unit to adjust the storage battery capacity,
With
The basket state is an inverter system characterized in that it includes the weight of the basket, the nearest destination floor that has been set, and the longest inter-floor distance between each floor up to the destination floor. The pre-operation control unit
An estimation unit that estimates the estimated value of the amount of regenerative power when regenerative operation is performed between the floors with the longest inter-floor distance.
A capacity adjusting unit that discharges the power of the storage battery so that the adjusted storage battery capacity satisfies the following formula (1).
The inverter system according to claim 1, wherein the inverter system is provided.
(Adjusted storage battery capacity) ≤ (Fully charged storage battery capacity)-(Estimated value of regenerative power) (1) The pre-operation control unit further includes a comparison determination unit that compares the value detected by the detection unit with the storage battery capacity detected by the detection unit and a preset threshold value to determine whether or not the storage battery capacity needs to be adjusted. Item 2. The inverter system according to item 2. The elevator has a configuration in which a basket and a weight for balancing are suspended in a fishing bottle style by a lifting rope wound around a drive sheave that rotates in conjunction with a motor.
The inverter system according to claim 2 or 3, wherein the current command value of the buck-boost chopper circuit in the capacitance adjusting unit is calculated by the following equation (4).
I ^* = k × (abs (Mm) × gH) / (V × t) (4)
In equation (4), I ^* is the current command value for which the discharge direction is positive, k is the coefficient considering power loss (k ≦ 1), M is the weight of the weight, m is the weight of the basket, g is the gravitational acceleration, and H is. The longest inter-floor distance between each floor. V is the storage battery voltage, t is the discharge time, and abs (Mm) is the absolute value of (Mm). The power supply process that converts AC power from the grid power supply into DC power by the regenerative converter section,
The inverter section connected to the regenerative converter section via the DC bus drives and controls the motor that moves the elevator basket, and the motor is driven or regenerated.
The charge / discharge process of charging / discharging the storage battery connected to the buck-boost chopper circuit by the charge / discharge unit having the buck-boost chopper circuit connected to the DC bus.
Have,
In the pre-operation period from when the elevator door in the open state is switched to the closed state to before the motor is operated by the operation process.
A detection process that detects the storage battery capacity and basket status of the storage battery,
A pre-operation control process that controls the charge / discharge unit based on the detection result of the detection process to adjust the storage battery capacity,
Have,
The inverter control method is characterized in that the basket state includes the weight of the basket, the set nearest destination floor, and the longest inter-floor distance between each floor up to the destination floor. The pre-operation control process is
The estimation process for estimating the estimated value of the regenerative electric energy when the regenerative operation is performed between the floors with the longest inter-floor distance, and
The capacity adjustment process for discharging the power of the storage battery and the capacity adjustment process so that the adjusted storage battery capacity satisfies the following formula (1).
5. The inverter control method according to claim 5, wherein the inverter control method is provided.
(Adjusted storage battery capacity) ≤ (Fully charged storage battery capacity)-(Estimated value of regenerative power) (1) The pre-operation control process is further characterized by having a comparative determination process of comparing the detected value of the storage battery capacity by the detection process with a preset threshold value to determine the necessity of adjusting the storage battery capacity. The inverter control method according to claim 6.

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