CN203166545U - Elevator energy feedback circuit having LCL filtering function - Google Patents

Elevator energy feedback circuit having LCL filtering function Download PDF

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CN203166545U
CN203166545U CN2013201029826U CN201320102982U CN203166545U CN 203166545 U CN203166545 U CN 203166545U CN 2013201029826 U CN2013201029826 U CN 2013201029826U CN 201320102982 U CN201320102982 U CN 201320102982U CN 203166545 U CN203166545 U CN 203166545U
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filter
lcl
circuit
bus
direct
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蒋青
曹杰
万健如
李昆鹏
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Tianjin Xinbaolong Elevator Group Co Ltd
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Tianjin Xinbaolong Elevator Group Co Ltd
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Abstract

The utility model relates to an elevator energy feedback circuit having an LCL filtering function. The circuit comprises an external three-phase alternating-current power grid power supply, an uncontrollable rectifier bridge module, a frequency converter power module, an elevator traction machine, and a grid-connected inverter, and the circuit further comprises an LCL grid-connected filter, a direct-current bus filtering capacitor, and an isolating diode. External power grid three-phase alternating-current signals are rectified by the uncontrollable rectifier bridge module and then outputted by a direct-current bus. The frequency converter power module, which is connected with positive and negative output terminals of the direct-current bus, conducts the inversion processing of direct-current signals, and then the signals are outputted to the elevator traction machine. Input terminals of the grid-connected inverter are respectively connected with the positive and negative terminals of the direct-current bus, while an output terminal of the grid-connected inverter is connected with an external power grid. The LCL grid-connected filter is connected between three-phase output of the grid-connected inverter and the external three-phase alternating-current power grid. The direct-current bus filtering capacitor is connected in parallel between the positive and negative terminals of the direct-current bus. The isolating diode is connected between a positive pole of the direct-current bus and an input positive pole of the grid-connected inverter. The elevator energy feedback circuit is better no matter from the angles of size and cost or from the angle of filtering effect, and in particular, the elevator energy feedback circuit is better in higher harmonic filtering effect directing at switching frequency.

Description

Lift energy feedback circuit with LCL filter function
Technical field
The utility model belongs to elevator variable frequency speed governing transmission control technology field, relates in particular to a kind of lift energy feedback circuit of the LCL of having filter function.
Background technology
In the frequency control drive system, elevator traction machine dragging system particularly, it is to be in regenerative power generation state that motor has quite a few time.This part regenerative electric energy is direct current energy by motor and inverter converts, acts on the intermediate dc filter capacitor and produces the pump up voltage.In order to prevent that this part regenerated energy that is stored on the dc filter capacitor from threatening system safety because can not in time discharging, consider for power saving simultaneously, require to utilize this part regenerative electric energy again, elevator regenerated electric energy energy Feedback Technology is subjected to people's extensive concern thus.
At present, both at home and abroad to the existing certain research basis of lift energy feedback technology.Traditional energy feedback unit is on original frequency changing driving system basis, the active inversion unit that the power switch tube module is formed is directly as the peripheral circuit of frequency conversion dragging system, be connected in parallel between frequency converter DC side and the three phase network, thus with regenerative electric energy feedback to electrical network.A vital problem is that also the harmonic wave of network energy is handled in the energy Feedback Technology.Traditional energy feedback unit is mostly taked single L type or CL type filter circuit, and this two classes circuit is simple in structure, control method is ripe.But at single L mode filter, for the high order harmonic component place in switching frequency or characteristic frequency obtains enough big attenuation amplitude, the common value of its filter inductance is bigger, not only causes whole energy feedback unit bulky thus, and has increased the cost of system.And with regard to CL type filter circuit, because whole motor frequency conversion dragging system presents the resistance sense load characteristic on the whole, therefore can interact and initiating system resonance to a great extent, cause stability of a system variation thus.
The utility model content
The purpose of this utility model is at the deficiencies in the prior art, a kind of lift energy feedback circuit of the LCL of having filter function is provided, the employed filter LCL circuit structure that is incorporated into the power networks of the utility model, not only effectively filter out harmful harmonic wave of feedback grid, effectively avoid the appearance of zero impedance resonance point simultaneously.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of lift energy feedback circuit with LCL filter function, this circuit comprises outside three-phase alternating current electric network source, uncontrollable rectifier bridge module, transducer power module, elevator traction machine and combining inverter, outside three-phase alternating current electrical network electric energy is that direct current signal is exported by dc bus through uncontrollable rectifier bridge module with the three-phase ac signal rectification, the transducer power module is connected with the positive-negative output end of dc bus, direct current signal is carried out inversion handle, export the three-phase ac signal of the required frequency of elevator traction machine then; The input of combining inverter is connected with the positive-negative output end of dc bus, the output of combining inverter is connected with outside three-phase alternating current electrical network, innovative point of the present utility model is: this circuit also comprises LCL be incorporated into the power networks filter, dc bus filter capacitor and isolating diode, and the described LCL filter that is incorporated into the power networks is connected between the three-phase output and outside three-phase alternating current electrical network of combining inverter; Described dc bus filter capacitor is connected in parallel on the positive negative output two ends of the dc bus of uncontrollable rectifier bridge module; The P utmost point of described isolating diode connects the positive terminal of dc bus, and the N utmost point connects the positive pole of the direct-flow input signal of combining inverter.
And described LCL is incorporated into the power networks filter by net side filter inductance L 11, L 12, L 13, filter capacitor C 1, C 2, C 3, damping resistance R 1, R 2, R 3And inverter side filter inductance L 21, L 22, L 23Form the be incorporated into the power networks inverter side filter inductance L of filter of LCL 21, L 22, L 23The three-phase alternating current output that connects combining inverter respectively, the LCL filter net side filter inductance L that is incorporated into the power networks 11, L 12, L 13Be connected with a, b, the c of outside three-phase alternating current electrical network respectively, at filter inductance L 21With L 11Connect R on the node of serial connection 1With C 1The R of series circuit 1End is at filter inductance L 22With L 12Connect R on the node of serial connection 2With C 2The R of series circuit 2End is at filter inductance L 23With L 13Connect R on the node of serial connection 3With C 3The R of series circuit 3End, filter capacitor C 1, C 2And C 3The other end link together.
And the described LCL filter circuit that is incorporated into the power networks is the symmetric form circuit, adopts C 1=C 2=C 3=C, L I1=L I2=L I3=L i, i=1,2 symmetric form circuit.
And, the described LCL R in the filter circuit that is incorporated into the power networks jValue be:
Advantage and the good effect of the utility model patent are:
When 1, the utility model is realized the lift energy feedback technology, do not influence former elevator variable frequency drive circuit topological structure.
2, the utility model adopts the filter that is incorporated into the power networks of LCL circuit structure, and is no matter from volume, the cost of circuit, or filtering performance, particularly more superior at the filter effect of the high order harmonic component of switching frequency or characteristic frequency.
3, the topological structure of the LCL filter that adopts of the utility model seals in a damping resistance respectively on every filter capacitor branch road, avoids the appearance of zero impedance resonance point effectively, has increased the stability of system.
Description of drawings
Fig. 1 is the utility model circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model patent working example is further described: it is emphasized that embodiment of the present utility model is illustrative, rather than determinate, can not be with present embodiment as the restriction to the utility model patent.
A kind of lift energy feedback circuit with LCL filter function, as shown in Figure 1, comprise outside three-phase alternating current electric network source 1, uncontrollable rectifier bridge module 2, transducer power module 4, elevator traction machine 5 and combining inverter 7, outside three-phase alternating current electrical network electric energy is that direct current signal is exported by dc bus through uncontrollable rectifier bridge module with the three-phase ac signal rectification, the transducer power module is connected with the positive negative output two ends of dc bus, direct current signal is carried out inversion handle, export the three-phase ac signal of the required frequency of elevator traction machine then; The input of combining inverter is connected with the positive negative output two ends of dc bus, and the output of combining inverter is connected with outside three-phase alternating current electrical network, and innovative point of the present utility model is,
This circuit also comprises LCL be incorporated into the power networks filter 8, dc bus filter capacitor 3 and isolating diode 6, and the described LCL filter that is incorporated into the power networks is connected between the three-phase output and outside three-phase alternating current electrical network of combining inverter; Described dc bus filter capacitor is connected in parallel on the positive negative output two ends of the dc bus of uncontrollable rectifier bridge module; The P utmost point of described isolating diode connects the positive terminal of dc bus, and the N utmost point connects the positive pole of the direct-flow input signal of combining inverter.
In concrete enforcement of the present utility model, as shown in Figure 1, LCL is incorporated into the power networks filter by net side filter inductance L 11, L 12, L 13, filter capacitor C 1, C 2, C 3, damping resistance R 1, R 2, R 3And inverter side filter inductance L 21, L 22, L 23Form the be incorporated into the power networks inverter side filter inductance L of filter of LCL 21, L 22, L 23The three-phase alternating current output that connects combining inverter respectively, the LCL filter net side filter inductance L that is incorporated into the power networks 11, L 12, L 13Be connected with a, b, the c of outside three-phase alternating current electrical network respectively, simultaneously, at filter inductance L 21With L 11, L 22With L 12, L 23With L 13The node place that connects connects by R respectively 1With C 1Series connection, R 2With C 2Series connection, R 3With C 3The filtering antihunt circuit that the series connection back is formed.
According to each symmetrical characteristic of electrical network, the LCL filter circuit that is incorporated into the power networks is the symmetric form circuit, and corresponding filter capacitor adopts C 1=C 2=C 3=C, inductance adopts L I1=L I2=L I3=L iThe symmetric form circuit of (i=1,2).
In concrete enforcement of the present utility model, R jValue on the one hand in conjunction with the value of other filter elements, so that resonance frequency f 0Avoid responsive frequency range, particularly switching frequency and multiple frequency place thereof.Simultaneously, take all factors into consideration system loss and stability characteristic, the general setting R j = 1 3 × 2 π f 0 C j .
In concrete enforcement of the present utility model, for the LCL filter parameters L that is incorporated into the power networks IjAnd C j(i=1,2; J=1,2,3), carry out initial setting according to existing knowledge, adjust correction by emulation or hardware testing then.
Operation principle of the present utility model
1, elevator traction machine 5 is in motoring condition
At this moment, elevator variable frequency drive part work, combining inverter and the LCL filter break-off of being incorporated into the power networks.
Outside three-phase alternating current electrical network is direct current signal through uncontrollable rectifier bridge module with the three-phase ac signal rectification at first.The dc bus filter capacitor is connected in parallel on the positive negative output two ends of the dc bus of uncontrollable rectifier bridge module, and the direct current signal that uncontrollable rectifier bridge module is exported carries out the filtering processing.The transducer power module is connected with the positive negative output two ends of dc bus, direct current signal after the dc bus filter capacitor filtering processing is carried out inversion to be handled, the three-phase ac signal of the required frequency of output elevator traction machine, final traction machine drag outside Elevator weight sensor 9 and cab 10 motions.
2, elevator traction machine 5 is in generating state
At this moment, elevator variable frequency drive part, combining inverter and LCL filter three parts that are incorporated into the power networks are all in running order.
When combining inverter is worked, for preventing that electric energy from directly flowing into combining inverter through the LCL filter that is incorporated into the power networks by outside three-phase alternating current electrical network, thereby between combining inverter and transducer power module, form circulation, cause lift energy feedback circuit cisco unity malfunction, therefore, increase an isolating diode at the combining inverter input port.The P utmost point of isolating diode connects the positive terminal of dc bus, and the N utmost point connects the side of the positive electrode of the direct-flow input signal of combining inverter.
LCL is incorporated into the power networks filter respectively by net side filter inductance L 11, L 12, L 13, filter capacitor C 1, C 2, C 3, damping resistance R 1, R 2, R 3And inverter side filter inductance L 21, L 22, L 23Four parts are formed.
The three-phase alternating current output of combining inverter respectively with the inverter side filter inductance L of the filter that is incorporated into the power networks 21, L 22, L 23Connect; Simultaneously, LCL is incorporated into the power networks filter by net side filter inductance L 11, L 12, L 13Be connected with a, b, the c of outside three-phase alternating current electric network source 1 respectively.
The concrete course of work is as follows:
Elevator traction machine produces regenerative electric energy, the transducer power module is direct current signal with this part regenerative electric energy rectification, because the unidirectional on state characteristic of uncontrollable rectifier bridge module is blocked the path that elevator regenerated electric energy is directly wired back and netted by former elevator variable frequency driver element path flow.At this moment, dc bus filter capacitor terminal voltage pump liter, after being increased to certain threshold value, regenerative electric energy enters combining inverter through isolating diode, through the AC signal that the combining inverter inversion is exported is incorporated into the power networks the filter filtering processing by LCL after, be fed back to the three-phase alternating current electrical network.
The lift energy feedback circuit with LCL filter function that the utility model proposes, the harmonic content that finally is fed back to the electrical network regenerated energy is to estimate an important indicator of this circuit performance, and one of key factor that influences this harmonic content to be LCL be incorporated into the power networks Filter Structures and parameter designing.
Further, realize the significantly target of ripple current decay for realizing with the small inductor amount for the LCL that the utility model proposes Filter Structures that is incorporated into the power networks.
The LCL filter circuit basic structure that is incorporated into the power networks comprises net side filter inductance L 1j, filter capacitor C j, damping resistance R j, inversion side filter inductance L 2j(j=1,2,3).
Wherein, damping resistance R jRespectively with filter capacitor C jBranch road be in series, this structure is because when considering undamped resistance, the LCL filter that is incorporated into the power networks has a fixing resonance frequency f 0, and have
Figure DEST_PATH_GDA00003386942300051
In the following formula, consider under the outside three phase network symmetric case that namely the LCL filter circuit configuration is also symmetrical, and C is arranged accordingly 1=C 2=C 3=C, L I1=L I2=L I3=L i(i=1,2).
Therefore, use damping resistance R jWith filter capacitor C jSeries arm avoided the appearance of zero impedance resonance point effectively, increased the stability of system.
For the be incorporated into the power networks parameter designing of filter of LCL, when harmonic frequency is low, ignore the damping resistance effect, the filter basic parameter that is incorporated into the power networks this moment designs by single L mode filter; When harmonic frequency is higher, consider damping resistance R jThe value size, specific design is analyzed as follows:
R jValue on the one hand in conjunction with the value of other filter elements, so that resonance frequency f 0Avoid responsive frequency range, particularly switching frequency and multiple frequency place thereof.Simultaneously, take all factors into consideration system loss and stability characteristic, the general setting
Figure DEST_PATH_GDA00003386942300052
For other parameters L IjAnd C j(i=1,2; J=1,2,3), carry out initial setting according to existing knowledge, adjust correction by emulation or hardware testing then, the filter effect of filter thereby assurance is incorporated into the power networks.

Claims (4)

1. lift energy feedback circuit with LCL filter function, this circuit comprises outside three-phase alternating current electric network source, uncontrollable rectifier bridge module, transducer power module, elevator traction machine and combining inverter, outside three-phase alternating current electrical network electric energy is that direct current signal is exported by dc bus through uncontrollable rectifier bridge module with the three-phase ac signal rectification, the transducer power module is connected with the positive-negative output end of dc bus, direct current signal is carried out inversion handle, export the three-phase ac signal of the required frequency of elevator traction machine then; The input of combining inverter is connected with the positive-negative output end of dc bus, and the output of combining inverter is connected with outside three-phase alternating current electrical network, it is characterized in that:
This circuit also comprises LCL be incorporated into the power networks filter, dc bus filter capacitor and isolating diode, and the described LCL filter that is incorporated into the power networks is connected between the three-phase output and outside three-phase alternating current electrical network of combining inverter; Described dc bus filter capacitor is connected in parallel on the positive negative output two ends of the dc bus of uncontrollable rectifier bridge module; The P utmost point of described isolating diode connects the positive terminal of dc bus, and the N utmost point connects the positive pole of the direct-flow input signal of combining inverter.
2. the lift energy feedback circuit with LCL filter function according to claim 1, it is characterized in that: described LCL is incorporated into the power networks filter by net side filter inductance L 11, L 12, L 13, filter capacitor C 1, C 2, C 3, damping resistance R 1, R 2, R 3And inverter side filter inductance L 21, L 22, L 23Form the be incorporated into the power networks inverter side filter inductance L of filter of LCL 21, L 22, L 23The three-phase alternating current output that connects combining inverter respectively, the LCL filter net side filter inductance L that is incorporated into the power networks 11, L 12, L 13Be connected with a, b, the c of outside three-phase alternating current electrical network respectively, at filter inductance L 21With L 11Connect R on the node of serial connection 1With C 1The R of series circuit 1End is at filter inductance L 22With L 12Connect R on the node of serial connection 2With C 2The R of series circuit 2End is at filter inductance L 23With L 13Connect R on the node of serial connection 3With C 3The R of series circuit 3End, filter capacitor C 1, C 2And C 3The other end link together.
3. the lift energy feedback circuit with LCL filter function according to claim 2 is characterized in that: the described LCL filter circuit that is incorporated into the power networks is the symmetric form circuit, adopts C 1=C 2=C 3=C, L I1=L I2=L I3=L i, i=1,2 symmetric form circuit.
4. the lift energy feedback circuit with LCL filter function according to claim 2 is characterized in that: the described LCL R in the filter circuit that is incorporated into the power networks jValue be:
Figure DEST_PATH_FDA00003386942200011
CN2013201029826U 2013-03-07 2013-03-07 Elevator energy feedback circuit having LCL filtering function Expired - Lifetime CN203166545U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103117558A (en) * 2013-03-07 2013-05-22 天津鑫宝龙电梯集团有限公司 Elevator energy feedback device with lower control limit filtering functions
CN103941103A (en) * 2014-05-09 2014-07-23 北京航天爱威电子技术有限公司 Device and method for measuring inductance value of electric reactor in active power filter
CN108215806A (en) * 2018-01-02 2018-06-29 宁波市江北九方和荣电气有限公司 A kind of regenerative braking energy feedback system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103117558A (en) * 2013-03-07 2013-05-22 天津鑫宝龙电梯集团有限公司 Elevator energy feedback device with lower control limit filtering functions
CN103941103A (en) * 2014-05-09 2014-07-23 北京航天爱威电子技术有限公司 Device and method for measuring inductance value of electric reactor in active power filter
CN103941103B (en) * 2014-05-09 2016-06-29 北京航天爱威电子技术有限公司 The measurement apparatus of reactor inductance amount and method in Active Power Filter-APF
CN108215806A (en) * 2018-01-02 2018-06-29 宁波市江北九方和荣电气有限公司 A kind of regenerative braking energy feedback system

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Granted publication date: 20130828