CN209217991U - A kind of frequency converter without external braking resistor - Google Patents
A kind of frequency converter without external braking resistor Download PDFInfo
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- CN209217991U CN209217991U CN201822275174.5U CN201822275174U CN209217991U CN 209217991 U CN209217991 U CN 209217991U CN 201822275174 U CN201822275174 U CN 201822275174U CN 209217991 U CN209217991 U CN 209217991U
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- frequency converter
- braking resistor
- charger
- super capacitor
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Abstract
The utility model discloses a kind of frequency converters without external braking resistor, the frequency converter includes the controlled rectification unit being electrically connected with AC network, the alternating current of AC network is converted to the DC bus of input converter after direct current by controlled rectification unit, braking resistor is electrically connected by switch with DC bus, charger is also connected on DC bus, IGBT inversion unit and controller, wherein charger is electrically connected with the super capacitor mould group of access DC bus, controller can control the start and stop of controlled rectification unit, it the size of charger charging current and switches on-off.Frequency converter disclosed in the utility model has preferably compatibility, not only can be omitted outer brake resistance, but also can select the internal detent resistance of smaller power, and had simplified the design of frequency converter and pitch-controlled system, reduce manufacturing cost.
Description
Technical field
The utility model belongs to wind power pitch-controlled system field, in particular to one of field is not necessarily to external braking resistor
Frequency converter.
Background technique
Wind turbine pitch system adjusts the speed motor using frequency converter, during frequency reduces (reduction of speed), due to
The presence of inertia, motor counter can generate electricity, and the electricity of sending is transported on the DC bus of frequency converter by IGBT inversion unit, make straight
The voltage pump rise for flowing bus, if will lead to DC bus overvoltage, excessively high DC voltage without corresponding electric discharge device at this time
Each section device will be made to be damaged or even burn out associated circuit components.Therefore, it must be taken when motor is in low speed state
Measure is to consume its electricity.Design general at present is the external braking resistor on frequency converter, is consumed in a manner of thermal energy
The energy that motor generates at this time, to achieve the purpose that reduce frequency changer direct current bus voltage.Since space limits, inside frequency converter
Generally can only the lesser braking resistor of integrated power, in actual use, in order to which guarantee can in the case where driving different motors
Sufficiently release braking energy, it usually needs increase additional high-power braking resistor outside frequency converter, not only structure is multiple in this way
It is miscellaneous, and increase cost.
Utility model content
Technical problem to be solved in the utility model be just to provide a kind of frequency converter without external braking resistor and its
DC bus charging method.
The utility model adopts the following technical solution:
A kind of frequency converter without external braking resistor, thes improvement is that: the frequency converter includes and alternating current
The controlled rectification unit of electrical connection is netted, the alternating current of AC network is converted to input converter after direct current by controlled rectification unit
DC bus, braking resistor by switch is electrically connected with DC bus, it is inverse that charger, IGBT are also connected on DC bus
Become unit and controller, wherein charger is electrically connected with the super capacitor mould group of access DC bus, and controller can control can
It controls the start and stop of rectification unit, the size of charger charging current and switches on-off.
A kind of frequency changer direct current bus charging method without external braking resistor is improved using above-mentioned frequency converter
Place is: the controller can monitor the voltage of DC bus, when the voltage of DC bus is less than or equal to setting value
Controller disconnects the switch between DC bus and braking resistor, as super capacitor mould group electricity at this time normally if controller control
Charger output low current makes super capacitor mould group be in floating charge state, the controller control if super capacitor mould group electricity at this time is low
Charger output high current processed makes super capacitor mould group be in charged state；It is controlled when the voltage of DC bus is higher than setting value
Device connects the switch between DC bus and braking resistor, and controls charger output high current and be in super capacitor mould group and fill
Electricity condition charges to super capacitor mould group by charger to reduce DC bus-bar voltage to setting value；As within a certain period of time
Charging times be more than setting value, controller control controlled rectification unit stops working certain time, in no DC supply input
In the case where DC bus, the super capacitor mould group for accessing DC bus is discharged to maintain frequency converter to work normally, and is being discharged
The electricity of super capacitor mould group reduces in journey, restarts controlled rectification again after the electricity of super capacitor mould group is reduced to normally
Unit is to restore the DC supply input of DC bus.
The beneficial effects of the utility model are:
Frequency converter and its charging method disclosed in the utility model, when motor is in low speed state, if direct current is female
The voltage of line is higher than setting value, and controller, which can control charger output high current, makes super capacitor mould group be in charged state,
To be large current discharge in short-term, the energy that consumption motor generates at this time reduces frequency changer direct current bus voltage to reach
Purpose.Requirement of the frequency converter to braking resistor can in this way be preferably minimized, reduces Design of Inverter by braking resistor type selecting
It restricts, makes same money frequency converter that there is preferably compatibility, not only can be omitted outer brake resistance, but also the interior of smaller power can be selected
Portion's braking resistor simplifies the design of frequency converter and pitch-controlled system, reduces manufacturing cost.Since braking energy is no longer with fever
Mode dissipates, but is charged the recycling of super capacitor mould group, not only saves energy, also reduces system temperature rise, can be with
More effectively protection frequency converter Primary Component, increases the reliability of product, extends other equipment in frequency converter and pitch-controlled system
Service life.Super capacitor mould group is chronically at overcharging state in order to prevent, if charging times within a certain period of time are more than
Setting value, controller control controlled rectification unit stops working certain time, suitably to be discharged super capacitor mould group,
It prolongs its service life.
Detailed description of the invention
Fig. 1 is the functional block diagram of frequency converter disclosed in the utility model embodiment 1；
Fig. 2 is the circuit connection diagram of frequency converter disclosed in the utility model embodiment 1.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Embodiment 1, it is as shown in Figs. 1-2, described present embodiment discloses a kind of frequency converter without external braking resistor
Frequency converter includes the controlled rectification unit being electrically connected with AC network, and controlled rectification unit is converted to the alternating current of AC network
The DC bus of input converter after direct current, braking resistor are electrically connected by switch with DC bus, on DC bus also
It is connected with charger, IGBT inversion unit and controller, wherein the super capacitor mould group of charger and access DC bus is electrically connected
Connect, controller can control the start and stop of controlled rectification unit, charger charging current size and switch on-off.
Frequency converter disclosed in the present embodiment is worked on the pitch-controlled system of wind-driven generator for driving motor,
The course of work are as follows: when pitch-controlled system works normally, frequency converter is powered by the three-phase alternating current of AC network, three-phase alternating current input
DC bus is output to by controlled rectification unit.DC bus is also used as and fills other than for IGBT inversion unit driving motor
The input of electric appliance is provided when abnormal or interruption occurs in AC power source by super capacitor mould group (backup power supply) for DC bus
Energy.
Motor counter can generate electricity in down speeding procedure, and the direct current that the electricity of sending is transported to frequency converter by IGBT inversion unit is female
On line, make the voltage pump rise of DC bus, when controller detects the voltage of DC bus higher than setting value, it is female to connect direct current
Switch between line and braking resistor discharges to DC bus by the braking resistor inside frequency converter, while controller
Control charger output high current makes super capacitor mould group be in charged state, to be large current discharge in short-term, consumption electricity
DC bus-bar voltage is down to setting value or less by the energy that machine generates at this time.
The present embodiment also discloses a kind of frequency changer direct current bus charging method without external braking resistor, and use is above-mentioned
Frequency converter, the controller can monitor the voltage of DC bus, when the voltage of DC bus is less than or equal to setting value
Controller disconnects the switch between DC bus and braking resistor, as super capacitor mould group electricity at this time normally if controller control
Charger output low current makes super capacitor mould group be in floating charge state, the controller control if super capacitor mould group electricity at this time is low
Charger output high current processed makes super capacitor mould group be in charged state；It is controlled when the voltage of DC bus is higher than setting value
Device connects the switch between DC bus and braking resistor, and controls charger output high current and be in super capacitor mould group and fill
Electricity condition charges to super capacitor mould group by charger to reduce DC bus-bar voltage to setting value；To prevent super capacitor
Mould group is chronically at overcharging state, and charging times such as within a certain period of time are more than setting value, and controller controls controlled rectification list
The member certain time that stops working accesses the super capacitor mould of DC bus in the case where no DC supply input DC bus
Group electric discharge is to maintain frequency converter to work normally, and the electricity of super capacitor mould group reduces during discharge, to super capacitor mould group
Electricity be reduced to it is normal after restart controlled rectification unit again to restore the DC supply input of DC bus.
Claims (1)
1. a kind of frequency converter without external braking resistor, it is characterised in that: the frequency converter includes being electrically connected with AC network
The alternating current of AC network is converted to the direct current of input converter after direct current by the controlled rectification unit connect, controlled rectification unit
Bus, braking resistor are electrically connected by switch with DC bus, and charger, IGBT inversion unit are also connected on DC bus
And controller, wherein charger is electrically connected with the super capacitor mould group of access DC bus, and controller can control controlled rectification
It the start and stop of unit, the size of charger charging current and switches on-off.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820307845 | 2018-03-06 | ||
| CN2018203078459 | 2018-03-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209217991U true CN209217991U (en) | 2019-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822275174.5U Active CN209217991U (en) | 2018-03-06 | 2018-12-30 | A kind of frequency converter without external braking resistor |
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| CN (1) | CN209217991U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412498A (en) * | 2018-03-06 | 2019-03-01 | 埃斯倍风电科技(青岛)有限公司 | A kind of frequency converter and its DC bus charging method without external braking resistor |
-
2018
- 2018-12-30 CN CN201822275174.5U patent/CN209217991U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412498A (en) * | 2018-03-06 | 2019-03-01 | 埃斯倍风电科技(青岛)有限公司 | A kind of frequency converter and its DC bus charging method without external braking resistor |
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