JP5094831B2 - Elevator system - Google Patents

Description

  The present invention relates to an elevator system, and more particularly to an elevator system that effectively uses regenerative power by using an energy storage device such as a storage battery.

  In the current medium / low speed class elevator system, the regenerative electric power from the motor is consumed by the resistance during the regenerative operation of the motor (when the potential energy returns to the electric energy). On the other hand, in order to save energy, there is a system that uses a rechargeable storage battery (also called a secondary battery) to store regenerative power in the storage battery and discharge it from the storage battery to the motor when necessary. It is being considered.

  In such a system, only regenerative operation continues when full load down and no load up are repeated, such as in the first half of lunch time in office buildings, leaving work, and working hours in apartments and condominiums. Therefore, if the storage capacity of the storage battery is small, there is no available capacity of the storage battery, and there is a problem that the regenerative power generated after full charge cannot be stored and reused. In order to deal with this problem, if all the regenerative power is stored in the storage battery, it is necessary to increase the storage capacity of the storage battery, leading to an increase in cost.

  On the other hand, the following proposal has been made as a method for effectively using regenerative power without increasing the storage capacity. For example, Patent Document 1 discloses a proposal that, based on preset conditions, when rechargeable battery charge is sufficiently large, regenerative power is converted into AC by a converter and returned to an external AC power source. Patent Document 2 discloses that the weight of the counterweight suspended on the opposite side of the rope with respect to the car is set to be lighter than the weight of the car when the number of passengers is zero. Proposals that do not generate power continuously are presented.

  Moreover, the following proposal is made | formed as a method of adjusting the charge amount of a storage battery. For example, in Patent Document 3, a charge target value is provided for each hour with respect to the amount of charge of the storage battery, and the charge target value is made smaller than at night when the operation is not performed much during the peak hours of operation. Suggestions to do are shown. Patent Document 4 discloses a proposal that estimates the amount of charge of a storage battery at a certain point in time and charges when the estimated value falls below a predetermined threshold value.

JP 2005-343574 A JP 2002-338151 A JP 2001-187676 A JP 2005-86927 A

  However, in the configuration in which the regenerative power is returned to the external AC power source as in Patent Document 1, it is necessary to use a switchable element (IGBT, GTO, etc.) for the converter that converts the external AC power to DC power, which is costly. Leading up. In addition, there is no problem if the regenerative power returned to the external AC power source can be consumed by another load of the same contractor (for example, powering operation of another elevator), but if it cannot be consumed, the regenerative power is further upstream than the power meter. In many cases, it is not allowed in the contract of electricity. In addition, in the configuration in which the counterweight is lighter than the conventional one as in Patent Document 2, when a full load-up request is generated, the power required is higher than the conventional one, and a motor with a large rating is required. Therefore, it leads to cost increase.

  Further, in Patent Document 3, since the charging target value is reduced in the driving peak time zone, there is an increased possibility that the free capacity of the storage battery for charging regenerative power can be secured, but the charging target value is set in advance. In addition, discharging from the storage battery is performed only during powering operation when the current storage battery charge amount exceeds the charging target value. There is a problem that you can not. In addition, no specific forecasts are made for the future, the battery is discharged based on the current charge amount, and as a result it is only close to the charge target value, so it is not assumed by the preset charge target value. If a sudden state such as this occurs and it is predicted that the amount of charge will increase in the future, the configuration of Patent Document 3 predicts the future amount of charge specifically and proactively in advance. Since it does not consider discharging, there is a problem that it cannot be dealt with.

  Moreover, in patent document 4, since only the shortage of energy storage amount is considered, it cannot respond when the regenerative operation increases and the energy storage amount increases.

  An object of the present invention is to provide an elevator system that can effectively use regenerative power even when the regenerative power suddenly increases and the amount of stored energy increases without increasing the storage capacity.

  In addition, other problems other than the above-described problems will be made clear from the entire description of the present specification or the drawings.

  In the elevator system of the present invention, the future energy storage amount of the energy storage device is estimated, and when the estimated value of the future energy storage amount exceeds a predetermined value, the energy stored in the energy storage device is calculated. In addition to discharging, at least a part of the discharged energy is consumed by a lighting device or a control device of a car.

  The basis of this idea is to estimate in advance whether the energy storage amount will be excessive due to the continuous generation of regenerative power in the future, that is, whether the energy storage amount of the energy storage device exceeds the maximum energy storage amount, and the excess storage will occur. In this case, the energy storage device is made free so that it can be actively discharged in advance from the estimated time point and the regenerative power generated thereafter can be charged. And by consuming at least a part of the discharged energy with the car lighting device or the control device, the energy storage device should be stored at a future time even when the elevator is stopped It is possible to actively approach the target value of energy storage amount.

  As a discharging method, the DC voltage of the smoothing capacitor of the elevator drive unit is controlled to a value larger than the maximum input voltage from the power source. If it sets as mentioned above, electric power will no longer be input from a power supply, and the electric power consumed by an elevator control power supply device or a car lighting device will be discharged from an energy storage device. In addition, by changing the DC voltage command value of the smoothing capacitor according to the excessive accumulation amount, and setting the DC voltage command value high when the excessive accumulation amount is large, the excessive accumulation amount can be consumed quickly. desirable.

  It should be noted that the power supply to the elevator control power supply device that supplies power to the control device, etc., and the car lighting device, etc., is normally smoothed by the elevator drive unit connected to the commercial power supply when the energy storage device is not discharged. A configuration may be adopted in which the DC voltage of the capacitor is converted to AC and supplied. In addition, when an elevator control power supply that supplies power to a control device, etc., or a car lighting device is connected to a commercial power supply that is different from the elevator drive unit, a power supply source switching device is provided to prevent excessive storage. A configuration may be adopted in which the power supply source is switched so that power is supplied from the energy storage device at the time when the occurrence of the power is estimated.

  The configuration of the present invention can be as follows, for example.

(1) A converter that rectifies AC power from a first commercial power source and converts it into DC power, a first inverter connected to the DC side of the converter, and a variable voltage / variable frequency from the first inverter. An AC motor to which AC power is supplied, a smoothing capacitor connected between the converter and the first inverter, and energy can be supplied to the AC motor during power running and regeneration An energy storage device capable of storing regenerative power during operation, a charging / discharging device for transferring power between the smoothing capacitor and the energy storage device, and a vehicle driven by the AC motor, An elevator system including a control device that controls the entire system including the control of the first inverter,
A second inverter connected to the smoothing capacitor for converting DC power to AC power and supplying power to at least one of the car lighting device and the control device;
The control device determines an energy storage amount estimation unit that estimates a future energy storage amount of the energy storage device, and whether or not an estimated value of the future energy storage amount exceeds a predetermined value, and the future energy storage amount If it is determined that the estimated value exceeds the predetermined value, the charging / discharging device is controlled to discharge the energy stored in the energy storage device, and the energy storage device is discharged. A charge / discharge control unit for consuming at least a part of energy at least one of the lighting device of the car and the control device ;
When the charge / discharge control unit discharges the energy stored in the energy storage device, the DC voltage command value at both ends of the smoothing capacitor is determined from the maximum voltage applied to the converter from the first commercial power source. And controlling the charging / discharging device with a large setting,
The charge / discharge control unit, as the DC voltage command value, sets an amount that is proportional to an amount in which an estimated value of the future energy accumulation amount exceeds a target value of the energy accumulation amount at the future time point, as the maximum value. Set to the value added to the voltage.

(2) Oite to (1), with respect to at least one of the illuminating device and the control device of the car, the or supply power from the different second commercial power supply and the first commercial power supply A power supply switching device for switching whether to supply power from the second inverter;
The charge / discharge control unit may be configured to switch the power supply switching device so that power is supplied from the second inverter when discharging the energy stored in the energy storage device.

( 3 ) In (1) or (2) , the predetermined value may be a value obtained by adding a predetermined threshold to a target value of the energy storage amount at the future time point.

( 4 ) In ( 3 ), the control device includes an energy storage amount storage device that stores a history of the energy storage amount,
The control device may be configured to calculate at least one of the estimated value and the target value of the future energy accumulation amount from the current and past energy accumulation amounts.

( 5 ) In ( 3 ), the control device determines from the load data in the car, data indicating the destination floor operated in the car, and landing call registration data operated in the landing, A required power amount calculation unit that calculates the amount of power required to move to a typical destination floor,
The control device may be configured to calculate at least one of the estimated value and the target value of the future energy storage amount from the required power amount calculated by the required power amount calculation unit.

  The above-described configuration is merely an example, and the present invention can be modified as appropriate without departing from the technical idea. Further, examples of the configuration of the present invention other than the above-described configuration will be clarified from the entire description of the present specification or the drawings.

  Typical effects of the present invention are as follows.

  According to the present invention, by estimating the future energy storage amount, even if the regenerative power suddenly increases and the energy storage amount increases, before the regenerative power is generated by discharging energy from the energy storage device in advance. In addition, since a space can be created in the energy storage device, the generated regenerative power can be used effectively without increasing the storage capacity. Furthermore, at least a part of the discharged energy is consumed by a car lighting device or a control device, so that the energy storage device should accumulate at a future time even when the elevator is stopped. It is possible to actively approach the target value of energy storage amount.

  Other effects of the present invention will become apparent from the description of the entire specification.

The block diagram of the elevator system of Example 1 of this invention. The specific control block diagram of the DC voltage command setting part in FIG. The control flowchart of the DC voltage command setting part in FIG. The specific control block diagram of the direct-current voltage control part in FIG. The specific control block diagram of the storage device current control part in FIG. Explanatory drawing of energy storage amount adjustment operation | movement in this invention. The block diagram of the elevator system of Example 2 of this invention. FIG. 8 is a specific control block diagram of a DC voltage command setting unit in FIG. 7. FIG. 8 is a control flowchart of a DC voltage command setting unit in FIG. 7. FIG.

  Embodiments of the present invention will be described with reference to the drawings. In each drawing and each embodiment, the same or similar components are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 1 shows a configuration diagram of an elevator system according to a first embodiment of the present invention. The elevator system of FIG. 1 is a “regenerative power storage system” in which regenerative electric power generated during regenerative operation is charged in the energy storage device 11 to accumulate energy, and the accumulated energy is discharged during power running operation. By reusing the regenerative power, it is possible to reduce the amount of power from the power source used for driving the elevator and to save energy.

  First, the basic configuration of the elevator drive unit in the elevator system of the present invention will be described. Three-phase AC power from an AC power source 1 that is a commercial power source is converted into DC power by a converter 2 such as a diode rectifier. The DC power converted by the converter 2 is smoothed by a smoothing capacitor 3, and the DC power is converted into three-phase AC power of variable voltage and variable frequency by an inverter 4 such as a PWM (Pulse Width Modulation) inverter. This inverter 4 supplies variable voltage and variable frequency three-phase AC power to an AC motor 5 and drives it at a variable speed. For example, an energy storage device 11 such as a storage battery is connected to both ends of the smoothing capacitor 3 via a charge / discharge device (DC / DC converter or step-up / down chopper) 10, and the charge / discharge device 10 is controlled by a control device 12. The A charging / discharging device (hereinafter, described by taking a DC / DC converter as an example) 10 charges DC energy to the energy storage device 11 in accordance with a control command from the control device 12 or DC power is supplied to the energy storage device 11. Or discharging to the (smoothing capacitor 3) side. The control device 12 has a function of controlling the entire system including the control of the inverter 4 in addition to the control of the charge / discharge device 10 described above. In FIG. 1, details of a portion that controls the inverter in the control device 12 and controls the entire system are omitted.

  The drive system of the elevator apparatus includes a sheave 6, a rope 7, a car 8, and a counterweight 9, and the AC car 5 can move the car 8 and the counterweight 9 at both ends of the rope 7 up and down.

  Next, a supplementary explanation of the elements of the energy storage system will be given. First, the DC / DC converter constituting the charging / discharging device 10 is configured by switching elements such as IGBTs (Insulated Gate Bipolar Transistors) and transistors, and can control the flow of DC power bidirectionally by a switching action. As the energy storage device 11, a secondary battery such as a lead storage battery, a sealed lead storage battery, a nickel hydride battery, a lithium ion battery, or a NaS battery, a large capacity capacitor such as an electric double layer capacitor, or a lithium ion capacitor can be used. . The control device 12 gives a control command (gate command) to the switching element of the charge / discharge device 10 to control the flow of power. As a result, the charging power and discharging power for the energy storage device 11 can be controlled.

  In addition, an inverter 14 such as a PWM inverter is connected to the DC circuit (smoothing capacitor 3) of the elevator drive unit via a diode 13 for preventing a backflow. The inverter 14 converts the DC voltage to a constant frequency and a constant voltage. To single-phase AC power. This single-phase AC power becomes a power supply source to the elevator control power supply device 16 and the car lighting device 17. The elevator control power supply device 16 supplies power to the control device 12, and is used as a control power supply for communication, input reception of button operations, various controls, and the like. The car lighting device 17 is a lighting device provided in the car 8.

  Next, processing of the control device 12 will be described. The control device 12 has the following two control functions. The first function is to control the DC voltage of the smoothing capacitor 3, and the second function is to control the current flowing into or out of the energy storage device 11. By combining these two functions, the following four controls can be realized. The first is control for charging the energy storage device 11 from the AC power source 1, and the second is control for supplying power from the energy storage device 11 to the elevator control power source device 16 or the car lighting device 17. Is a control for discharging power from the energy storage device 11 during powering of the AC motor 5 and supplying electric power to the AC motor 5, and a fourth control is for charging the storage battery 11 with regenerative power when the AC motor 5 is regenerated. . Hereinafter, specific processing of the control device 12 will be described in detail.

  In the control device 12, the energy storage amount estimation unit 122 first calculates a future (after a certain time) from the current energy storage amount VB of the energy storage device 11 detected by the energy storage amount sensor 21 and the time information t from the clock 121. Estimated energy storage amount VB '). For the estimation, for example, the amount of power consumption of the AC motor 5 is measured, and is estimated from the data in which the history is recorded at each time, the operation locus of the car 8 recorded by the group management controller (not shown), or the like. The estimated future time may be a measurement interval of the power consumption or a predetermined interval such as one hour. For the estimation method, the technique disclosed in Patent Document 4 (Japanese Patent Laid-Open No. 2005-86927) can be employed. The energy storage amount sensor 21 actually uses a current sensor when the energy storage device 11 is a secondary battery, and a value obtained by integrating the value is set as the current energy storage amount VB, and the energy storage device 11 Is a large-capacity capacitor, a voltage sensor is used, and the current energy storage amount VB is calculated from the voltage value.

Next, the energy storage amount deviation calculation unit 123 calculates the future energy storage amount estimated value VB ′ estimated by the energy storage amount estimation unit 122 and the energy storage amount at the future time calculated by the energy storage amount target value calculation unit 128. A deviation ΔVB = VB′−VB ^* between them is obtained from the quantity target value VB ^* .

Here, the energy storage amount target value VB ^* calculated by the energy storage amount target value calculation unit 128 differs depending on the purpose of using the energy storage device 11. For example, if the “backup operation method” is intended to move the elevator even in the event of a power failure, this is the amount of energy required to drive to the nearest floor or for a predetermined time. Further, in the case of the “regenerative power storage method” in which regenerative power generated during regenerative operation is charged and discharged during powering operation, the space required for storing regenerative power generated in the future from the storage limit value of the energy storage device 11. The value is obtained by subtracting the capacity. In addition, in the “peak cut method” that cuts the peak power of the input power from the power source, the amount of energy necessary for that (the amount of energy corresponding to the cut amount) is obtained.

In calculating the energy storage amount target value VB ^* , when a future movement needs to be predicted, the future amount is estimated in the same manner as the method for obtaining the future energy storage amount estimation value VB ′. In calculating the future energy storage amount estimated value VB ', it is sufficient to consider the current and the future time point to be estimated. However, in the case of the energy storage amount target value VB ^* , further ahead The necessary energy storage amount target value VB ^* is determined in consideration of not becoming insufficient or excessive at the time.

For example, as a method of determining at least one of the future energy storage amount estimated value VB ′ and the energy storage amount target value VB ^* at the future time point, the control device 12 stores the history of the energy storage amount VB of the energy storage device 11. An energy storage amount storage device (not shown) for storing the energy storage amount is provided, and at least one of the future energy storage amount estimated value VB ′ and the energy storage amount target value VB ^* at the future time point is determined from the current and past energy storage amounts. Can be configured to calculate.

Further, as a method for determining at least one of the estimated energy storage amount VB ′ in the future and the energy storage amount target value VB ^* at the future time point, the control device 12 uses the load data in the car 8, A required power amount calculation unit (not shown) that calculates the amount of power required to move to the final destination floor from the data indicating the destination floor operated in the car 8 and the landing call registration data operated at the landing And calculating at least one of a future energy storage amount estimated value VB ′ and a future energy storage amount target value VB ^* from the required power amount calculated by the required power amount calculation unit. It is good.

Next, the DC voltage command setting unit 124 creates a DC voltage command Vdc ^* across the smoothing capacitor 3 from the deviation ΔVB of the future energy storage amount.

FIG. 2 is a specific control block diagram of DC voltage command setting unit 124 in FIG. The deviation ΔVB of the future energy storage amount calculated by the energy storage amount deviation calculation unit 123 is compared with the discharge threshold value THP and the charge threshold value THM by the threshold value determination unit 1241. Basically, the discharge threshold THP ≧ 0 and the charge threshold THM ≦ 0 are set. Here, the discharge threshold value THP and the charge threshold value THM vary depending on the importance that the energy storage amount command value VB ^* must be observed. For example, if the system cannot be established if there is not enough storage, such as “backup operation method” or “peak cut method”,
THM = 0 (1)
In other cases, it is set in consideration of the number of times the energy storage device 11 is charged and discharged. For example, if the discharge threshold value THP or the charge threshold value THM is set to a value close to 0, the charge / discharge start / stop state frequently changes, and the energy storage device is likely to deteriorate. . Therefore, the discharge threshold THP and the charge threshold THM are set so that the charge / discharge start / stop state does not change very frequently.

When ΔVB> THP in threshold value determination unit 1241, future energy accumulation amount estimated value VB ′ is set to a predetermined value (in this case, energy accumulation amount target value VB ^* at the future time point is set to discharge threshold value THP). Therefore, it is determined that discharging is necessary, and the threshold determination unit 1241 outputs a determination code JSW = 0. As a result, the changeover switch 1242 is connected to the switch terminal 1243 side, and the direct-current voltage command value Vdc ^* is multiplied by the proportional coefficient kd to the maximum voltage Vsmax of the alternating-current power supply 1 as shown in equation (4) described later. A value obtained by adding ΔVB is set. This is because as the deviation ΔVB of the future energy storage amount is larger, the discharge amount is increased and the deviation ΔVB of the future energy storage amount is actively brought closer to 0. Further, the maximum voltage Vsmax of the AC power supply 1 is as follows when the AC effective value is 200V:
Vsmax = √2 × 200 = 282.8 (V) (2)
When the AC effective value is 400V,
Vsmax = √2 × 400 = 565.7 (V) (3)
It becomes.

If ΔVB <THM in threshold value determination unit 1241, future energy storage amount estimated value VB ′ is set to a predetermined value (in this case, energy storage amount target value VB ^* at the future time point is set to discharge threshold value THM). Therefore, it is determined that charging is necessary, and the threshold determination unit 1241 outputs a determination code JSW = 2. As a result, the changeover switch 1242 is connected to the switch terminal 1245 side, and the direct-current voltage command value Vdc ^* is multiplied by the proportional coefficient kc from the maximum voltage Vsmax of the alternating-current power supply 1 as shown in equation (5) described later. A value obtained by subtracting ΔVB is set. This is to increase the charge amount as the absolute value of the deviation ΔVB of the future energy storage amount increases.

If threshold determination section 1241 determines that neither discharging nor charging is necessary, determination code JSW = 1 is output. As a result, the changeover switch 1242 is connected to the switch terminal 1244 side, and the maximum voltage Vsmax of the AC power supply 1 is set to the DC voltage command value Vdc ^* as shown in Equation (6) described later. This point is summarized as follows.

When ΔVB> THP, Vdc ^* = Vsmax + kd × ΔVB (4)
When ΔVB <THM, Vdc ^* = Vsmax−kc × ΔVB (5)
In other cases, Vdc ^* = Vsmax (6)
FIG. 3 shows a control flowchart of the DC voltage command setting unit 124 in FIG. First, after the start (S001), the threshold value determination unit 1241 (FIG. 2) determines whether discharge is required (whether ΔVB> THP is satisfied) (S002). When it is determined that the discharge is necessary, the value of the equation (4) is set to the DC voltage command value Vdc ^* (S003), and the process ends (S004). If it is determined in S002 that discharging is not required, it is determined in the threshold value determination unit 1241 (FIG. 2) whether charging is required (whether ΔVB <THM is satisfied) (S005). If it is determined that charging is necessary, the value of the equation (5) is set to the DC voltage command value Vdc ^* (S006), and the process is terminated (S007). If it is determined in S005 that charging is not required, the value of equation (6) is set in the DC voltage command value Vdc ^* (S008), and the process is terminated (S009).

  This is the end of the description of the DC voltage command setting unit 124, and the description returns to FIG.

The DC voltage control unit 125 generates the storage device current command IB ^* from the DC voltage command value Vdc ^* and the DC voltage Vdc across the smoothing capacitor 3 detected by the voltage sensor 22.

FIG. 4 shows a specific control block diagram of the DC voltage controller 125 in FIG. In the DC voltage control unit 125, the calculator 1251 calculates a deviation (Vdc ^* −Vdc) between the DC voltage command Vdc ^* and the measured DC voltage Vdc of the smoothing capacitor 3, and is proportional to make the difference zero. An integral compensator (PI compensator) 1252 performs proportional integral compensation. The output of the proportional-integral compensator 1252 is a storage device current command IB ^* for the energy storage device 11.

Returning to FIG. The storage device current control unit 126 generates an output voltage command VX ^* to the charge / discharge device 10 from the storage device current command IB ^* and the storage device current IB detected by the current sensor 23.

FIG. 5 shows a specific control block diagram of the storage device current control unit 126 in FIG. The storage device current control unit 126 calculates a deviation (IB ^* −IB) between the storage device current command IB ^* and the measured storage device current IB by the calculator 1261, and proportional-integral compensation so that the difference becomes zero. Proportional integral compensation is performed by the device 1262. The output of the proportional-integral compensator 1262 becomes an output voltage command VX ^* for the charge / discharge device 10.

Returning to FIG. The PWM control unit 127 converts the output voltage command VX ^* into a gate signal G ^* that drives the charge / discharge device 10 by pulse width modulation. The gate signal G ^* is input to the charging / discharging device 10 and desired control (switching control) is performed. As described above, in the control device 12, the DC voltage control unit 125 and the storage device current control unit 126 control the DC voltage Vdc and the storage device current IB, respectively, so that desired charge / discharge control can be performed.

  FIG. 6 illustrates an operation of adjusting the stored energy when the estimated energy storage amount VB ′ of the energy storage device 11 becomes excessive in this system. In order to simplify the explanation, the elevator is stopped. FIG. 6 shows the determination code JSW, DC voltage Vdc, storage device current IB, power supply current effective value IS, and energy storage amount VB in order from the top. Assume that the current time is t = t0, the estimated future energy storage amount VB ′ is estimated at this time, and the deviation ΔVB of the future energy storage amount is obtained.

Thereby, the trajectory A1 of the determination code JSW changes from 1 to 0, and the trajectory B1 of the DC voltage command value Vdc ^* is set to a value larger than the maximum voltage Vsmax of the AC power supply 1. The DC voltage controller 125 (FIG. 1) causes the locus B2 of the DC voltage Vdc to follow the DC voltage command value Vdc ^* . Looking at the locus C2 of the storage device current IB at that time, the storage device current control unit 126 (FIG. 1) rises following the locus C1 of the storage device current command that has been raised to increase the DC voltage Vdc. Here, the storage device current IB> 0 is shown as discharging, and the storage device current IB <0 is shown as charging.

  The trajectory D1 of the power source current effective value IS had a positive value to supply power to the elevator control power source device 16 and the car lighting device 17 before t0, but the DC voltage Vdc became larger than the maximum voltage Vsmax. As a result, no current flows. Thus, by discharging the stored energy from the energy storage device 11, the energy storage amount VB decreases as shown by the locus E1. Then, the discharge is terminated at time t = t1 when the discharge is unnecessary by the threshold value determination unit 1241 (FIG. 2). The energy storage amount VB is adjusted by the flow as described above.

According to the present invention, the control device 12 includes an energy storage amount estimation unit 122 that estimates a future energy storage amount of the energy storage device 11 and a future energy storage amount estimation value VB ′ that is a predetermined value (for example, this future storage amount). When it is determined whether the energy storage amount target value VB ^* at the time is higher than the charging threshold value THP), and it is determined that the future energy storage amount estimated value VB ′ exceeds the predetermined value The charge / discharge device 10 is controlled to discharge the energy stored in the energy storage device 11, and at least a part of the energy discharged from the energy storage device 11 is transferred to the car lighting device 17 of the car 8. It is set as the structure provided with the charging / discharging control part 129 consumed by at least one side among the control apparatuses 12. FIG. As a result, it is possible to predict in advance that the future energy storage amount will be excessive, and to positively create a free capacity that can be discharged from the energy storage device 11 in advance to store future regenerative power, and for example, the elevator stops. Even if the power running operation is not performed as in the case of the inside, the energy storage amount is actively reduced for the future by consuming the elevator control power supply device 16 or the car lighting device 17 even if it is a little. It is possible to keep. In addition, during the power running operation, the discharged energy is consumed by the AC motor 5 in addition to these devices.

  In the present invention, since the energy consumed by the elevator control power supply device 16 and the car lighting device 17 is not so large, the energy storage amount used for charge / discharge control and its target value are not current values but future values. By predicting and using this and controlling the start of discharge in advance, the amount of energy consumed by the elevator control power supply device 16 and the car lighting device 17 can be increased, so the energy storage amount adjustment function can be more efficiently performed. It is based on the idea that it can function.

  Here, for example, as shown in FIG. 1, the charge / discharge control unit 129 includes an energy storage amount deviation calculation unit 123, a DC voltage command setting unit 124, a DC voltage control unit 125, a storage device current control unit 126, and a PWM control unit 127. However, the present invention is not limited to this, and other configurations may be used as long as they have similar functions.

In the present embodiment, as shown in Expression (4), the estimated energy storage amount VB ′ in the future exceeds the energy storage amount target value VB ^* at the future time as the DC voltage command value Vdc ^* . The amount (kd × ΔVB) proportional to the amount (deviation ΔVB) is set to a value added to the maximum voltage Vsmax. (Value) may be added. Similarly, in the case of charging, a value that is not proportional to the deviation ΔVB may be used without using kc × ΔVB as shown in Equation (5).

  FIG. 7 shows a block diagram of an elevator system according to the second embodiment of the present invention. In the present embodiment, the power supply method to the elevator control power supply device 16 and the car lighting device 17 is different from that in the first embodiment. Therefore, in the present embodiment, only portions different from the first embodiment will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  A power source switching device 18 is connected to the inverter 14, and an elevator control power source device 16 and a car illumination together with an AC power source 15 (commercial power source different from the AC power source 1) which is a commercial power source connected to the power source switching device 18. It becomes a power supply source to the device 17. Which of the AC power supply 15 and the single-phase AC power converted by the inverter 14 is the power supply source for the elevator control power supply device 16 and the car lighting device 17 is determined by the switch 19 by the power switch switching command SSW from the control device 12. Selected by switching. Normally, the switch 19 is set on the terminal 20-2 side and is supplied with power from the AC power supply 15.

  Next, processing of the control device 12 will be described. In the control device 12, the configuration of the DC voltage command setting unit 124 ′ is different from the DC voltage command setting unit 124 of the first embodiment. Accordingly, the charge / discharge control unit 129 of the first embodiment is changed to the charge / discharge control unit 129 ′ in the second embodiment.

In the control device 12, the energy storage amount estimation unit 122 first determines the future (certain time) from the current energy storage amount VB of the energy storage device 11 detected by the energy storage amount sensor 21 and the time information t from the clock 121. Estimate the energy storage amount estimate VB ′ (later). Thereafter, the energy storage amount deviation calculation unit 123 uses the energy storage amount estimation value VB ′ estimated by the energy storage amount estimation unit 122 and the energy storage amount target value VB ^* calculated by the energy storage amount target value calculation unit 128 to Deviation ΔVB = VB′−VB ^* . The processing so far is the same as in the first embodiment.

Next, the DC voltage command setting unit 124 ′ creates a DC voltage command Vdc ^* and a power switch switching command SSW at both ends of the smoothing capacitor 3 from the deviation ΔVB of the future energy storage amount.

FIG. 8 is a specific control block diagram of the DC voltage command setting unit 124 ′ in FIG. The deviation ΔVB of the future energy storage amount calculated by the energy storage amount deviation calculation unit 123 is compared with the discharge threshold value THP and the charge threshold value THM by the threshold value determination unit 1241. As a result, when ΔVB> THP, the determination code JSW = 0, when ΔVB <THM, the determination code JSW = 2 is output, and when neither is the determination code JSW = 1, the DC voltage is determined by the value of the determination code JSW. The value output to the command value Vdc ^* is different. The processing so far is the same as in the first embodiment.

  In the second embodiment, the power switch switching command SSW is switched by the determination code JSW. When the determination code JSW = 0, that is, when it is determined that discharge is necessary, the selector switch 1246 is connected to the switch terminal 1247 side in order to connect the elevator control power supply device 16 and the car lighting device 17 as devices that consume the discharged energy. Then, the power switch switching command SSW = 0. As a result, in FIG. 7, the switch 19 of the power supply switching device 18 is connected to the terminal 20-1 side, and the power supply source of the elevator control power supply device 16 and the car lighting device 17 is the single-phase AC created by the inverter 14.

  On the other hand, when the determination code JSW = 1, 2, that is, when it is determined that no discharge is required, the changeover switch 1246 is switched to the switch terminal 1248 in order to use the AC power supply 15 for the elevator control power supply device 16 and the car lighting device 17. The power switch switching command SSW = 1. As a result, the switch 19 of the power supply switching device 18 in FIG. 7 is connected to the terminal 20-2 side, and the power supply source of the elevator control power supply device 16 and the car lighting device 17 is the AC power supply 15.

FIG. 9 shows a control flowchart of the DC voltage command setting unit 124 ′ in FIG. First, after the start (S101), the threshold value determination unit 1241 (FIG. 8) determines whether discharge is necessary (ΔVB> THP is satisfied) (S102). When it is determined that the discharge is necessary, the value of the equation (4) is set to the DC voltage command value Vdc ^* (S103), the power switch switching command SSW = 0 is set (S104), and the process is terminated (S104). S105). When it is determined in S102 that discharging is not necessary, the power switch switching command SSW = 1 is set (S106), and the threshold value determination unit 1241 (FIG. 8) determines whether charging is required (ΔVB <THM is satisfied). (S107). If it is determined that charging is necessary, the value of equation (5) is set to the DC voltage command value Vdc ^* (S108), and the process is terminated (S109). If it is determined in S107 that charging is not necessary, the value of equation (6) is set in the DC voltage command value Vdc ^* (S110), and the process is terminated (S111).

Returning to FIG. 7, the description will be continued. The DC voltage control unit 125 generates the storage device current command IB ^* from the DC voltage command value Vdc ^* and the DC voltage Vdc across the smoothing capacitor 3 detected by the voltage sensor 22, and this is input to the storage device current control unit 126. Is done. The storage device current control unit 126 generates an output voltage command VX ^* to the charge / discharge device 10 from the storage device current command IB ^* and the storage device current IB detected by the current sensor 23. Then, the PWM control unit 127 converts the output voltage command VX ^* into a gate signal G ^* for driving the charge / discharge device 10 by pulse width modulation. The gate signal G ^* is input to the charging / discharging device 10 and desired control is executed. As described above, in the control device 12, the DC voltage control unit 125 and the storage device current control unit 126 control the DC voltage Vdc and the storage device current IB, respectively, so that desired charge / discharge control can be performed.

  As described above, according to the first and second embodiments of the present invention, the regenerative power can be effectively used even when the regenerative power suddenly increases and the energy storage amount increases without increasing the storage capacity. Can be built.

  The present invention has been described using the embodiments. However, the configurations described in the embodiments so far are only examples, and the present invention can be appropriately changed without departing from the technical idea.

1,15 AC power supply 2 Converter (diode rectifier)
3 Smoothing capacitors 4 and 14 Inverter 5 AC motor 6 Elevator sheave 7 Elevator rope 8 Elevator car 9 Elevator counterweight 10 Charge / discharge device (DC / DC converter and step-up / down chopper)
11 Energy storage devices (storage batteries, etc.)
DESCRIPTION OF SYMBOLS 12 Control apparatus 13 Diode 16 Elevator control power supply apparatus 17 Car illuminating apparatus 18 Power supply switching apparatus 19 Switch 20-1, 20-2 of power supply switching apparatus 21 Energy storage amount sensor 22 Voltage sensor 23 Current sensor 121 Clock 122 Energy storage amount estimation unit 123 Energy storage amount deviation calculation unit 124, 124 'DC voltage command setting unit 125 DC voltage control unit 126 Storage device current control unit 127 PWM control unit 128 Energy storage amount target value calculation unit 129, 129' Charge / discharge Control unit 1241 Threshold judgment unit 1242, 1246 Changeover switch 1243, 1244, 1245, 1247, 1248 Switch terminals 1251, 1261 Operational units 1252, 1262 Proportional integral compensator

Claims (5)

A converter that rectifies AC power from a first commercial power source and converts it into DC power, a first inverter connected to the DC side of the converter, and AC power of variable voltage and variable frequency from the first inverter An AC motor supplied with power, a smoothing capacitor connected between the converter and the first inverter, and capable of supplying energy to the AC motor during powering operation and regenerating during regenerative operation An energy storage device capable of storing electric power, a charging / discharging device for transferring power between the smoothing capacitor and the energy storage device, a car driven by the AC motor, the first An elevator system including a control device that controls the entire system including control of the inverter
A second inverter connected to the smoothing capacitor for converting DC power to AC power and supplying power to at least one of the car lighting device and the control device;
The control device determines an energy storage amount estimation unit that estimates a future energy storage amount of the energy storage device, and whether or not an estimated value of the future energy storage amount exceeds a predetermined value, and the future energy storage amount If it is determined that the estimated value exceeds the predetermined value, the charging / discharging device is controlled to discharge the energy stored in the energy storage device, and the energy storage device is discharged. A charge / discharge control unit for consuming at least a part of energy at least one of the lighting device of the car and the control device ;
When the charge / discharge control unit discharges the energy stored in the energy storage device, the DC voltage command value at both ends of the smoothing capacitor is determined from the maximum voltage applied to the converter from the first commercial power source. And controlling the charging / discharging device with a large setting,
The charge / discharge control unit, as the DC voltage command value, sets an amount that is proportional to an amount in which an estimated value of the future energy accumulation amount exceeds a target value of the energy accumulation amount at the future time point, as the maximum value. The elevator system is characterized by being set to a value added to the voltage . Whether power is supplied from a second commercial power source different from the first commercial power source or from the second inverter to at least one of the car lighting device and the control device Power supply switching device
The charging and discharging control unit, when discharging the energy stored in the energy storage device, according to claim 1, characterized in that for shifting said power switching device to provide power from the second inverter The elevator system described in. The elevator system according to claim 1 or 2 , wherein the predetermined value is a value obtained by adding a predetermined threshold value to a target value of the energy storage amount at the future time point. The control device includes an energy storage amount storage device that stores a history of the energy storage amount,
The elevator system according to claim 3 , wherein the control device calculates at least one of the estimated value and the target value of the future energy storage amount from the current and past energy storage amounts. . The control device moves from the load data in the car, the data indicating the destination floor operated in the car, and the landing call registration data operated in the landing to the final destination floor. A required power amount calculation unit for calculating the amount of power required for
The control device calculates at least one of the estimated value and the target value of the future energy storage amount from the required power amount calculated by the required power amount calculation unit. Item 4. The elevator system according to item 3 .

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