CN102452588B - Energy-saving device for elevator - Google Patents
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Abstract
The invention discloses an energy-saving device for an elevator. The device comprises an energy storage device, an energy storage device state detector, a charging and discharging circuit and an energy storage device controller, wherein the energy storage device controller performs charging and discharging control on the energy storage device according to the stored energy or residual capacity of the energy storage device at each zero power point in subsequent operation of the elevator, and an estimated value of the consumed or generated power and energy of an elevator motor between adjacent zero power points or in an interval from the current moment or position to the nearest zero power point. The energy of the elevator can be saved through electric energy release and regeneration energy storage, and power and energy consumed or generated when the elevator finishes the operation can be estimated at the specific moment, so that the operation load of a processor, the severe fluctuation of bus voltage and the charging and discharging current impact of the energy storage device are effectively reduced, and the capacity of the energy storage device can be fully utilized.
Description
Technical Field
The invention relates to an energy-saving device for an elevator, in particular to a device for realizing energy conservation of the elevator by using an energy storage device.
Background
In recent years, the problem of processing regenerated energy generated in the operation of an elevator motor is solved by appropriately controlling an energy storage device additionally arranged in a main driving loop of the elevator to store the regenerated energy during the regenerative operation of the elevator motor and release the stored energy during the electric operation of the elevator motor, so as to provide electric energy for the electric operation of the elevator motor, and meanwhile, the realization of the energy saving effect of the elevator is a research hotspot in the elevator industry, such as Chinese invention patent application publication No. CN 101381046A, CN 1845417A, CN1946625A, Chinese invention patent publication No. CN 100593504C, CN 100450907C, CN1229275C, and international application publications WO2010/019122A1, WO2010/019123A1, WO2010/019126A1, WO2010/027346A1 and the like.
In the elevator energy-saving device which realizes energy saving by utilizing 'regenerative energy storage and electric energy release' of the energy storage device, the energy storage device controller controls the charging and discharging current passing through the charging and discharging circuit to make the magnitude and the direction of the charging and discharging current track the instruction value of the charging and discharging circuit, thereby realizing the charging and discharging process of the energy storage device. In the prior art, the charge/discharge current command value of the energy storage device is generally generated by real-time calculation according to the actual operation state of the elevator traction machine. Because of real-time calculation, and some techniques are complex and have large calculation amount, a large calculation burden is caused to the processor. Although international application specification WO2010/027346a1 realizes elevator energy saving by determining a predicted usage pattern of an elevator, setting a target storage state of an energy storage device, and exchanging power among an elevator traction machine, a power supply, and the energy storage device, the method has disadvantages that past operation data of the elevator needs to be collected, a large data storage capacity is required, and the actual effect thereof depends on the accuracy of an analysis result to some extent.
On the other hand, in an elevator energy saving device based on an energy storage device, the capacity of the energy storage device and the energy stored therein have a direct influence on the actual effect of elevator energy saving, but the prior art has not been thoroughly discussed about the problem. The general treatment method is as follows: the energy storage device discharges to provide electric energy for the electric operation of the elevator motor, and when the energy storage device finishes discharging, the power supply of the energy storage device is directly switched to the power supply of the power grid; the energy storage device stores the regenerated energy generated during the regenerative operation of the elevator motor, and when the energy storage device is fully charged with electric energy, the energy storage device is switched to convert the regenerated energy into heat energy by the energy consumption circuit to be released or fed back to the power grid through the controllable rectifier. The processing mode does not consider the electric energy consumed by the elevator in the current operation or the generated regenerated energy and the stored energy or residual capacity information in the energy storage device, only meets the electric energy requirement (absorption or generation) of the elevator motor through simple switching, and the switching process accompanied by large current impact can cause the bus voltage to fluctuate violently, thereby generating adverse effect on the driving performance of the elevator, and in addition, the large current impact can also generate adverse effect on the service life of the energy storage device.
In addition, the capacity of the energy storage device in the energy saving device of the elevator in the general energy storage class is relatively limited due to the aspects of cost, volume and the like, so that the utilization condition of the capacity of the energy storage device becomes an important factor influencing the energy saving effect of the energy saving device of the elevator. Therefore, how to fully utilize the capacity of the energy storage device to realize elevator energy saving to the maximum extent becomes an important factor influencing the energy saving effect of the elevator energy saving device.
Therefore, the development of an elevator energy-saving device which can utilize an energy storage device to process the regenerated energy generated in the running process of an elevator and reduce the energy consumption of the elevator, and simultaneously can fully utilize the capacity of the energy storage device, effectively overcome the defects that the operation load of a processor is overlarge and large data storage capacity is needed in the prior art, fully utilize the electric energy needed to be consumed or the generated regenerated energy in the current running of the elevator and the relation between the electric energy and the stored energy or residual capacity in the energy storage device, effectively slow down the severe fluctuation of bus voltage, avoid the charging and discharging current impact of the energy storage device and the like becomes a technical problem to be solved for realizing the energy saving of the elevator by utilizing the energy storage device.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an elevator energy-saving device, which can effectively reduce the operation load of a processor, reduce the data storage capacity, effectively slow down the severe fluctuation of bus voltage and realize the full utilization of the capacity of an energy storage device.
In order to solve the technical problem, the elevator energy-saving device of the invention comprises:
an energy storage device which is bridged at the two ends of the direct current bus through a charging and discharging circuit and is used for storing the regenerated energy generated during the regeneration operation of the elevator motor and releasing the stored energy to the direct current bus when the elevator motor operates electrically,
the energy storage device state detector is used for detecting the working state of the energy storage device;
the energy storage device controller is used for controlling the energy flow between the direct current bus and the energy storage device;
the charging and discharging circuit is arranged between the direct current bus and the energy storage device and is used for realizing the bidirectional flow of energy between the direct current bus and the energy storage device; wherein,
and the energy storage device controller performs charge and discharge control on the energy storage device according to the stored energy or residual capacity of the energy storage device at each zero power point in the subsequent operation of the elevator and the estimated value of consumed or generated power and energy of the elevator motor at each adjacent zero power point or in an interval from the current time or position to the nearest zero power point.
The elevator energy-saving device can utilize the energy storage device to store regenerated energy when the elevator motor operates in a regeneration mode, and release the stored energy when the elevator motor operates in an electric mode to provide the elevator motor with the energy for the elevator motor to operate in the electric mode, so that the energy consumption of the elevator is reduced.
The elevator energy-saving device of the invention effectively overcomes the defects of overlarge operation load of a processor and large data storage capacity in the prior art by calculating the charge-discharge control command value at a specific time or position point and fully utilizing the electric energy required to be consumed or the regenerated energy to be generated by the operation of the elevator and the relation between the electric energy and the stored energy or the residual capacity in the energy storage device.
The elevator control device can effectively slow down the severe fluctuation of the bus voltage and avoid the charging and discharging current impact of the energy storage device by properly selecting the charging and discharging control instruction value function.
The elevator control device can further realize the full utilization of the capacity of the energy storage device by properly selecting the charge and discharge control command value function.
In the prior art, in particular in the patents or patent application documents which are now published, the invention is primarily concerned with chinese invention patent specification CN1217841C and international application specification WO2010/027346a 1.
Chinese patent specification CN1217841C utilizes an additional required power calculation circuit to calculate the required power of the elevator in real time according to the voltage command value applied to the motor and the motor current or the current command value supplied to the motor, then determines that the motor is in an electric or regenerative state according to the positive or negative of the calculated required power of the elevator, and finally controls the charging and discharging control circuit according to the determination result. In this control method, the required power is derived from a voltage command value applied to the motor and a motor current or a current command value supplied to the motor; the required power needs to be calculated in real time; the motor state needs to be determined.
In the elevator energy-saving device, the energy storage device controller only needs to calculate the control command value of the charge-discharge control unit at a specific time or position point and controls the charge-discharge of the energy storage device according to the command value. Obviously, the invention is completely different from the Chinese invention patent specification CN1217841C, and compared with the invention, the invention can effectively reduce the calculation load of the processor because real-time calculation is not needed.
Although the international application specification WO2010/027346a1 determines the predicted usage pattern of the elevator by analyzing stored elevator operation data including the operation interval time, the power consumption of each operation, and the like, the disadvantage of large calculation load of the processor due to real-time calculation in other technologies is avoided; however, the method has the defects that the former operation data of the elevator needs to be collected, a large data storage capacity is needed, and the actual effect depends on the accuracy of the analysis result to a certain extent. In the invention, the control command value of the charge and discharge control unit is calculated only at a specific time or position point, so that the charge and discharge of the energy storage device can be controlled, and the defects of international application specification WO2010/027346A1 are completely overcome.
In addition, for the relation between the electric energy consumed or the regenerated energy to be generated by the operation of the elevator which is not related in the prior art and the stored energy or the residual capacity in the energy storage device, the invention realizes the full utilization of the capacity of the energy storage device on the basis of fully utilizing the information, and effectively avoids the defects of severe fluctuation of the bus voltage, overlarge charging and discharging current impact of the energy storage device and the like.
Drawings
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
fig. 1 is a schematic diagram of the general structure of an embodiment of an elevator energy-saving device provided by the invention;
FIG. 2 is a schematic diagram of an embodiment of an energy storage device controller according to the present invention;
FIG. 3 is a schematic diagram of one embodiment of a bus voltage control loop of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of the charge and discharge control unit according to the present invention.
The symbols in the drawings illustrate that:
1. external power supply 2, rectifier 3, and smoothing dc capacitor
4. Bus voltage detection device 5, energy consumption circuit 6 and direct current bus
7. Inverter 8, current detection device 9, and elevator motor
10. Traction sheave 11, guide sheave 12 and counterweight
13. Car 14, speed detection device 15, elevator drive controller
16. Energy consumption controller 17, charging and discharging circuit 18 and energy storage device controller
19. Energy storage device 20 and energy storage device state detector
Detailed Description
Before explaining the embodiments of the present invention in detail, the following convention shall be made for the convenience of the following description:
the energy and power consumed by the elevator motor 9 in the electric operation state are positive, whereas the (regenerated) energy and power generated by the elevator motor 9 in the regeneration operation state are negative, a positive current or command value thereof indicates that the current direction flows from the energy storage device 19 to the dc bus 6 through the charging and discharging circuit 17, and a negative current or command value thereof indicates that the current direction flows from the dc bus 6 to the energy storage device 19 through the charging and discharging circuit 17.
Referring to fig. 1, in the present embodiment, an external power source 1 is connected to a three-phase current side of a rectifier 2, a dc side of the rectifier 2 is connected to a dc side input terminal of an inverter 7 through a dc bus 6, a smoothing dc capacitor 3 and an energy consumption circuit 5 are respectively connected across both ends of the dc bus 6, a bus voltage detection device 4 is disposed at both ends of the smoothing dc capacitor 3, the 3-phase current side of the inverter 7 is connected to an elevator motor 9 through a current detection device 8, the elevator motor 9 is connected to a traction sheave 10 through a specific structure, and a car 13 and a counterweight 12 are suspended on both sides of the traction sheave 10 and a guide sheave 11 through ropes. The elevator driving controller 15 generates a control signal to the inverter 7 according to a landing call, an in-car instruction or a dispatching command of a group control system, and an actual rotating speed of the elevator motor 9 detected by the speed detection device 14 and a current detection result of the current detection device 8, so that the elevator motor 9 drives the car 13 to move up and down in the hoistway.
The energy storage device 19 is connected across the two ends of the direct current bus 6 through the charging and discharging circuit 17. The energy storage device controller 18 controls the charging and discharging circuit 17 according to the dc bus voltage detected by the bus voltage detection device 4, the detection result from the energy storage device state detector 20, and the information on the subsequent operation condition of the elevator from the elevator drive controller 15, thereby realizing the energy transfer between the energy storage device 19 and the dc bus 6. The power consumption controller 16 controls the switching elements of the power consumption circuit 5 to be turned on and off according to the dc bus voltage detected by the bus voltage detection device 4 and information from the energy storage device controller 18. The energy consumption circuit 5 is used for converting the regenerated energy into heat energy to realize the consumption of the regenerated energy.
The energy storage device state detection means 20 detects the operating state of the energy storage device 19 by detecting one or a combination of more parameters of the latter that are capable of directly or indirectly representing the actual operating state of the energy storage device, such as the charging rate, terminal voltage, charging and discharging current, temperature, etc. of the energy storage device.
Referring to fig. 2, the energy storage device controller 18 of the present invention comprises the following sub-units:
and the energy storage calculation unit is used for calculating the stored energy or the residual capacity of the energy storage device according to the detection result of the energy storage device state detector 20.
And the power and energy estimation unit estimates the power and energy power consumed or generated by the elevator motor 9 at each zero power point or in the interval from the current time or position of the elevator motor to the nearest zero power point according to the subsequent running condition of the elevator.
The command generation unit is used for generating a control command value of the charge and discharge control unit according to the consumed or generated power and energy power of the elevator motor 9 output by the power and energy estimation unit and the stored energy or residual capacity of the energy storage device 19 output by the energy storage calculation unit according to a certain rule;
and the charge and discharge control unit controls the on and off of a power switch element in the charge and discharge circuit according to the control instruction value of the charge and discharge control unit generated by the instruction generation unit, so that the tracking of the charge and discharge current or power of the energy storage device 19 on the instruction value is realized.
The specific working process is as follows:
when the elevator is started to run after receiving a call command in the car 13 and/or a landing or the task allocation of the elevator group control system, or when the stop floor of the elevator in the current running is changed due to the occurrence of a new call command in the car 13 and/or the landing or the task allocation of the elevator group control system in the running process, the elevator driving controller 15 generates a speed pattern to be followed before the elevator finishes the current running according to the information of the load, the stop floor and the like of the elevator, controls the motor 9 through the inverter 7 according to the speed pattern, so that the elevator car 13 runs in the hoistway at a desired speed, and outputs the load, the speed pattern and other elevator related information to the energy storage device controller 18. The energy storage device controller 18 controls the charging and discharging circuit 17 according to the subsequent running condition information of the elevator from the elevator driving controller 15, the state information of the energy storage device 19 from the energy storage device state detector 20 and the bus voltage from the bus voltage detection device 4, so that the energy and the power are transferred between the direct current bus 6 and the energy storage device 19.
The energy storage device controller 18 controls the charging and discharging circuit 17, and includes the steps of:
and the power and energy estimation unit estimates the power and energy power which will be consumed or generated by the elevator among the zero power points according to the subsequent running condition of the elevator.
The energy storage calculation unit calculates the stored energy or the residual capacity of the energy storage device 19 according to the detection result from the energy storage device state detector 20, calculates the stored energy if the output of the power and energy estimation unit is positive, and calculates the residual capacity if the output of the power and energy estimation unit is negative.
The command generating unit generates a power control command value P of the charge and discharge control unit according to the extreme value and the power of the consumed energy of the elevator motor 9 output by the power and energy estimating unit and the stored energy or the residual capacity of the energy storage device 19 output by the energy storage calculating unit as followses(t)：
If E ises≥|EmotorI, then Pes(t)＝min(|Pmotor(t)|，|Pesm(t)|)，t∈[t1，t2]；
If E ises＜|EmotorI, then Pes(t) satisfies
Wherein, when EmotorWhen > 0, EesIs the stored energy in the energy storage device; when E ismotorWhen < 0, EesIs the residual capacity of the energy storage device, EmotorIs a predicted value of the energy to be consumed or generated by the elevator between adjacent zero power points in the subsequent operation; | is an absolute operator, Pes(t) is a power control instruction value function of the charge and discharge control unit, min (-) is a small operator, Pmotor(t) elevator motor power between adjacent zero power points in subsequent runs; when E ismotorWhen > 0, Pesm(t) is the maximum discharge power allowed by the energy storage device and the charge and discharge circuit; when E ismotorWhen < 0, Pesm(t) is the minimum charging electric power allowed by the energy storage device and the charging and discharging circuit; t is t1Is the time corresponding to the initial zero power point in the adjacent zero power points, t2Is the time corresponding to the last zero power point in the adjacent zero power points.
The charge and discharge control unit controls the on and off of a power switch element in the charge and discharge circuit according to the control instruction value of the charge and discharge control unit generated by the instruction generation unit, so that the tracking of the charge and discharge current or power of the energy storage device on the instruction value is realized.
In addition, the command generation unit may use the obtained power control command value P for generation of the control command value of the charge/discharge control unitesAnd (t) dividing the bus voltage or the terminal voltage of the energy storage device, taking the obtained quotient as a current control instruction value of the charging and discharging control unit, and limiting the current control instruction value to be the maximum value when the instruction value is larger than the maximum value allowed by the charging and discharging circuit and the energy storage device. The amplitude limit value of the power control instruction value or the current control instruction value, namely the maximum charge-discharge power or current value allowed by the charge-discharge circuit and the energy storage device, can be adjusted according to the actual working conditions of the stored energy storage device and the charge-discharge circuit.
In order to avoid the fluctuation of the direct current bus voltage caused by the power estimated value error of the elevator motor 9 caused by the factors such as system efficiency, friction and the like, a bus voltage control loop as shown in figure 3 can be added, and the working process is as follows: the actual value of the DC bus voltage and the reference value thereof are used as input quantities to be sent to a subtracter, the subtracter obtains the DC bus voltage error after subtraction, the error is further used as input to be sent to a voltage controller, and the voltage controller outputs a control instruction value (power or current) required for obtaining the compensation bus voltage error. The sum of the control command value (power or current) and the control command value obtained as described above is subjected to appropriate amplitude limitation to be used as the control command value of the charge/discharge control unit. Because the bus voltage control loop part needs to be calculated in real time, the addition of the bus voltage control loop can increase the calculation load of the processor to a certain extent.
Fig. 4 is a schematic structural diagram of the charge and discharge control unit, and the working process is as follows: the control instruction value and the actual charging and discharging current or power of the energy storage device 19 are sent to a subtracter as input quantity, the subtracter obtains a current or power error after subtraction, the error is further sent to a current or power controller as input, the subtracter outputs a control command of the charging and discharging circuit 19, and the charging and discharging circuit 19 is controlled according to the control command, so that the exchange of energy between the direct current bus 6 and the energy storage device 20 can be completed.
In the invention, the calculation of the power and energy estimation unit, the energy storage calculation unit and the instruction generation unit for the respective outputs of the power and energy estimation unit, the energy storage calculation unit and the instruction generation unit occurs before the elevator operates at the current time, or when the elevator changes the stop floor of the elevator operating at the current time, or at a zero power point in the subsequent operation.
In the invention, the power and energy estimation unit, the energy storage calculation unit and the instruction generation unit finish the calculation of the output of each unit from the current time or position to the completion of each stage of the operation at one time before the elevator starts the operation at the time or changes the operation stop layer at the time, or calculate the output of each unit corresponding to the adjacent zero power point before the elevator motor enters the adjacent zero power point.
In the invention, when the regenerative power or the regenerative current of the elevator motor between adjacent zero power points exceeds the range allowed by the energy storage device and the charging and discharging circuit, the energy consumption circuit can start working when the bus voltage rises to a certain preset value, so that the bus voltage is stabilized at a proper position or interval; or the part of the regenerated power or the regenerated current of the elevator motor in subsequent operation, which exceeds the allowable range of the energy storage device and the charging and discharging circuit, is used as an energy consumption controller instruction, the energy consumption circuit is properly controlled, the constant or regular change of the bus voltage is realized through the cooperative control of the energy storage device controller and the energy consumption controller, and the energy consumption controller adopts an open-loop or closed-loop control structure for controlling the energy consumption circuit.
In the invention, the subsequent operation condition of the elevator refers to one or more combinations of load, stop floor, speed, acceleration, speed pattern, residual travel, system efficiency and other elevator related information before the elevator completes the operation. The energy storage device can be one or more combinations of a storage battery, a super capacitor, a nano capacitor and other energy storage devices which are not mentioned, or one or more combinations of the storage battery, the super capacitor or the nano capacitor and a fuel cell. The charge and discharge circuit is any single branch or a bidirectional DC-DC power converter with n (n is more than or equal to 2) branches. In addition, the device of the invention can be connected in parallel in an elevator group consisting of a plurality of elevators sharing a direct current bus.
It should be added that: when the elevator is moving up with no load or down with full load, although the elevator motor 9 is generally in a regenerative state and generates regenerative energy and regenerative power during the operating period from start to run to the stop floor, the elevator motor 9 may undergo a relatively short motoring process during its start to obtain a certain acceleration. If the control of the energy storage device 19 by the energy storage device controller 18 for charging and discharging is not based on zero power points in the subsequent run of the elevator (in fact, the zero power point is the switching point of the motoring and regenerating states of the elevator motor), but on the complete run cycle of the elevator, the following cannot be dealt with: when the elevator is moving up empty or down full load but the remaining capacity of the energy storage device 19 cannot accommodate the regenerative energy that will be generated by the elevator motor 9 during acceleration. The control of the charging and discharging of the energy storage means 19 by the energy storage means controller 18 according to the invention is therefore based on the zero power points in the subsequent run of the elevator. If the energy required for the motoring process in the above situation to obtain acceleration is negligible, the energy storage control 18 according to the invention can be simplified on the basis of the interval from the current moment or position of the elevator to the completion of the run, i.e.: the energy storage device controller 18 performs charge and discharge control on the energy storage device 19 according to the current stored energy or residual capacity of the elevator and the estimated value of power and energy consumed or generated by the elevator motor 9 from the current time or position point to the completion of the operation.
The core idea of the invention is to realize the charge and discharge control of the energy storage device 19 by utilizing the characteristic that the elevator can estimate the power and energy consumed or generated in the subsequent operation by changing the stop floor or the zero power point before starting, so that any changes such as estimation methods of changing the power and the energy on the basis of the invention are regarded as natural extension and expansion of the invention, and therefore, the changes are regarded as the protection range of the invention.
Claims (13)
1. An elevator energy saving device comprising:
the energy storage device is bridged at two ends of the direct current bus through a charging and discharging circuit and is used for storing the regenerated energy generated during the regeneration operation of the elevator motor and releasing the stored energy to the direct current bus when the elevator motor operates electrically;
the energy storage device state detector is used for detecting the working state of the energy storage device;
the energy storage device controller is used for controlling the energy flow between the direct current bus and the energy storage device;
the charging and discharging circuit is arranged between the direct current bus and the energy storage device and is used for realizing the bidirectional flow of energy between the direct current bus and the energy storage device; it is characterized in that the preparation method is characterized in that,
the energy storage device controller controls the charging and discharging of the energy storage device according to the stored energy or residual capacity of the energy storage device at each zero power point in the subsequent operation of the elevator and the predicted value of the consumed or generated power and energy of the elevator motor at each adjacent zero power point or the interval from the current time or position to the nearest zero power point;
the energy storage device controller comprises the following subunits:
the energy storage calculation unit is used for calculating the stored energy or the residual capacity of the energy storage device according to the detection result of the energy storage device state detector;
the power and energy pre-estimating unit is used for pre-estimating power and energy power to be consumed or generated by the elevator motor at each zero power point or in an interval from the current time or position of the elevator motor to the nearest zero power point according to the subsequent running condition of the elevator;
the command generation unit is used for generating a control command value of the charge and discharge control unit according to the power and the energy consumed or generated by the elevator motor output by the power and energy estimation unit and the stored energy or the residual capacity of the energy storage device output by the energy storage calculation unit according to a certain rule;
the charge and discharge control unit controls the on and off of a power switch element in the charge and discharge circuit according to the control instruction value generated by the instruction generation unit, so that the tracking of the charge and discharge current or power of the energy storage device on the instruction value is realized;
the power and energy estimation unit, the energy storage calculation unit and the instruction generation unit respectively output the calculation before the elevator starts to run at this time, or when the elevator changes the running stop floor at this time, or at a zero power point in the subsequent running.
2. The elevator energy saving device of claim 1, wherein: the zero power point refers to the time or position when the power consumed or generated by the elevator motor is zero in the process from the current time or position to the completion of the operation.
3. The elevator energy saving device of claim 1, wherein: the subsequent operation condition of the elevator refers to one or more combinations of load, stop floor, speed, acceleration, speed graph, residual stroke and system efficiency before the elevator finishes the operation.
4. The elevator energy saving device according to claim 1, wherein the command generating means generates the power control command value P of the charge and discharge control means according to the following rulees(t)：
If E ises≥|EmotorI, then Pes(t)=min(|Pmotor(t)|，|Pesm(t)|),t∈[t1,t2]；
If E ises<|EmotorI, then Pes(t) satisfies
Wherein, when Emotor>At 0, EesIs the stored energy in the energy storage device; when E ismotor<At 0, EesIs the residual capacity of the energy storage device, EmotorIs a predicted value of the energy to be consumed or generated by the elevator between adjacent zero power points in the subsequent operation; | is an absolute operator, Pes(t) is a power control instruction value function of the charge and discharge control unit, min (-) is a small operator, Pmotor(t) elevator motor power between adjacent zero power points in subsequent runs; when E ismotor>At 0, Pesm(t) is the maximum discharge power allowed by the energy storage device and the charge and discharge circuit; when E ismotor<At 0, Pesm(t) is the minimum charging electric power allowed by the energy storage device and the charging and discharging circuit;t1is the time corresponding to the initial zero power point in the adjacent zero power points, t2Is the time corresponding to the last zero power point in the adjacent zero power points.
5. The elevator energy saving device of claim 4, wherein: the control instruction value generated by the instruction generating unit is the power control instruction value PesAnd (t) dividing the bus voltage or the terminal voltage of the energy storage device to obtain a quotient which is used as a current control instruction value of the charge and discharge control unit, and when the current control instruction value is larger than the maximum value allowed by the charge and discharge circuit and the energy storage device, limiting the current control instruction value to the maximum value.
6. The elevator energy-saving device according to claim 1, wherein the power and energy estimating unit, the energy storage calculating unit and the command generating unit finish the calculation of the output of each unit from the current time or position to the completion of each stage of the operation at one time before the elevator starts the operation at the current time or changes the stop floor of the operation at the current time, or calculate the output of each unit corresponding to the adjacent zero-power point before the elevator motor enters the adjacent zero-power point.
7. The elevator energy saving device according to claim 4 or 5, characterized in that: and the amplitude limit value of the power control instruction value or the current control instruction value, namely the maximum charge-discharge power or current value allowed by the charge-discharge circuit and the energy storage device, is adjusted according to the actual working conditions of the energy storage device and the charge-discharge circuit.
8. The elevator energy saving device of claim 1, wherein: the energy consumption circuit is arranged at two ends of the direct current bus and used for converting the regenerated energy into heat to realize the consumption of the regenerated energy, and when the regenerated power or the regenerated current of the elevator motor between adjacent zero power points exceeds the range allowed by the energy storage device and the charging and discharging circuit, the energy consumption circuit starts to work when the bus voltage rises to a certain preset value so as to stabilize the bus voltage at a proper position or interval.
9. The elevator energy saving device of claim 1, wherein: when the regenerative power or the regenerative current of the elevator motor between adjacent zero power points exceeds the range allowed by the energy storage device and the charge and discharge circuit, the part of the regenerative power or the regenerative current of the elevator motor in subsequent operation exceeding the range allowed by the energy storage device and the charge and discharge circuit is used as an instruction value of the energy consumption controller, the energy consumption controller appropriately controls the energy consumption circuit, and the voltage of the bus is constant or changed according to a certain rule through the cooperative control of the energy storage device controller and the energy consumption controller.
10. The elevator energy saving device of claim 9, wherein: the energy consumption controller adopts an open-loop or closed-loop control structure for controlling the energy consumption circuit.
11. The elevator energy saving device of claim 1, wherein: the energy storage device can be one or more combinations of a storage battery, a super capacitor or a nano capacitor, or one or more combinations of the storage battery, the super capacitor or the nano capacitor and a fuel cell.
12. The elevator energy saving device of claim 1, wherein: the charging and discharging circuit is any single branch or a bidirectional DC-DC power converter with n branches, wherein n is more than or equal to 2.
13. The elevator energy saving device of claim 1, wherein: the elevator energy-saving device is connected in parallel in an elevator group consisting of a plurality of elevators sharing a direct current bus.
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| CN201010513838.2A CN102452588B (en) | 2010-10-21 | 2010-10-21 | Energy-saving device for elevator |
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| CN201010513838.2A CN102452588B (en) | 2010-10-21 | 2010-10-21 | Energy-saving device for elevator |
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| CN102452588B true CN102452588B (en) | 2014-01-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103350935A (en) * | 2013-07-17 | 2013-10-16 | 湖南中建建科机械有限公司 | Energy-saving control system |
| CN106564786B (en) * | 2015-10-13 | 2018-08-14 | 上海三菱电梯有限公司 | Elevator control method based on three level power converters and control device |
| CN108408515B (en) * | 2018-03-21 | 2020-01-07 | 上海交通大学 | Elevator energy recovery system and method based on energy storage battery |
| CN113224808A (en) * | 2021-04-14 | 2021-08-06 | 钟亮 | Novel elevator energy-saving device based on super capacitor |
| CN114380171A (en) * | 2022-02-21 | 2022-04-22 | 同济大学 | Energy-saving elevator and energy-saving method of elevator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311150A (en) * | 2000-02-28 | 2001-09-05 | 三菱电机株式会社 | Elevator control device |
| CN101409526A (en) * | 2007-10-10 | 2009-04-15 | 株式会社日立制作所 | Elevator system and accumulator unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08208140A (en) * | 1995-02-02 | 1996-08-13 | Hitachi Ltd | Controller for elevator |
| JP2001226049A (en) * | 2000-02-15 | 2001-08-21 | Mitsubishi Electric Corp | Control device for elevator |
| JP2003048672A (en) * | 2001-08-03 | 2003-02-21 | Mitsubishi Electric Corp | Elevator control device |
| US8172042B2 (en) * | 2005-10-07 | 2012-05-08 | Otis Elevator Company | Elevator power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311150A (en) * | 2000-02-28 | 2001-09-05 | 三菱电机株式会社 | Elevator control device |
| CN101409526A (en) * | 2007-10-10 | 2009-04-15 | 株式会社日立制作所 | Elevator system and accumulator unit |
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