CN209313455U - A kind of three-phase grid-connected inverter circuit - Google Patents
A kind of three-phase grid-connected inverter circuit Download PDFInfo
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- CN209313455U CN209313455U CN201920009605.5U CN201920009605U CN209313455U CN 209313455 U CN209313455 U CN 209313455U CN 201920009605 U CN201920009605 U CN 201920009605U CN 209313455 U CN209313455 U CN 209313455U
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Abstract
A kind of three-phase grid-connected inverter circuit, including main circuit and control circuit, main circuit include DC filter, PWM inverter and net side inductance；DC filter, which is arranged, to be all connected with a net side inductance on DC source positive and negative end, the input terminal of DC filter both ends connection PWM inverter, the external three-phase electricity of the output end of PWM inverter, three lines of three-phase electricity and is connected to power network；Control circuit includes dsp system, network voltage and phase detecting circuit, power network current detection circuit, IPM driving and protection circuit and direct current bus voltage detecting circuit；Network voltage and phase detecting circuit connect between power network and net side inductance; power network current detection circuit connects between net side inductance and PWM inverter; the IPM driving connects in PWM inverter with protection circuit, and direct current bus voltage detecting circuit connects on DC filter；Dsp system is connect with network voltage and phase detecting circuit, power network current detection circuit, IPM driving with protection circuit and direct current bus voltage detecting circuit respectively.
Description
Technical field
The utility model belongs to technical field of power generation, and in particular to a kind of three-phase grid-connected inverter circuit.
Background technique
Three-phase grid-connected inverter obtains in recent years as one of the critical component in distributed generation system and micro-capacitance sensor technology
In-depth study is arrived.Studying at present more is that solar energy power generating, wind power generating set and fuel cell etc. are renewable
Energy power generation and elevator energy feedback, i.e., the electric energy feedback generated electric power generation to power grid.Gird-connected inverter is used as can be again
The interface arrangement of the raw energy and power grid, plays an important role, and superior performance is directly related to the height of efficiency of energy utilization,
Therefore gird-connected inverter becomes one of the hot spot of new energy field research.
With the development of new energy distributed generation system, when voltage swells, rapid drawdown, imbalance and harmonic wave etc. occurs in power grid
When power quality problem, system is transferred to isolated operation mode, and voltage magnitude and frequency at this time is born by internal micro source controller
Duty is adjusted.In this case, traditional gird-connected inverter control mode is difficult to meet the needs of power system stability operation.Cause
This, will develop the voltage-type three-phase grid-connected inverter control technology suitable for electric system.
Summary of the invention
The utility model provides a kind of three-phase grid-connected inverter, solves the problems of the prior art.
In order to achieve the above object, the technical solution of the utility model is as follows:
A kind of three-phase grid-connected inverter circuit, including main circuit and control circuit, the main circuit include DC filter,
PWM inverter and net side inductance；The DC filter setting is in DC source positive and negative end, the connection of DC filter both ends
The input terminal of PWM inverter, the external three-phase electricity of the output end of the PWM inverter are all connected with a net on three lines of three-phase electricity
Side inductance is simultaneously connected to power network；The control circuit includes dsp system, network voltage and phase detecting circuit, power network current inspection
Slowdown monitoring circuit, IPM driving and protection circuit and direct current bus voltage detecting circuit；The network voltage and phase detecting circuit connect
Between power network and net side inductance, the power network current detection circuit is connect between net side inductance and PWM inverter, the IPM
Driving connects in PWM inverter with protection circuit, and the direct current bus voltage detecting circuit connects on DC filter；It is described
Dsp system drives and protection circuit and direct current with network voltage and phase detecting circuit, power network current detection circuit, IPM respectively
Busbar voltage detection circuit connection.
Further, it drives and protects between circuit and dsp system in the IPM and be additionally provided with controllable rectifier bridge.
Further, the DC filter is the DC bus capacitor for being connected to DC source positive and negative end.
Further, current foldback circuit is also connected between the power network current detection circuit and the dsp system.
Further, voltage guarantor is also connected between the network voltage and phase detecting circuit and the dsp system
Protection circuit.
Further, the dsp system includes DSPIC33FJ64GS606 chip.
Compared with prior art, the beneficial effects of the utility model are as follows:
The dsp system of this practical information be separately connected network voltage and phase detecting circuit, power network current detection circuit,
IPM driving and protection circuit, direct current bus voltage detecting circuit.Dsp system is used for power network current, voltage, including its amplitude
It is coordinately transformed with the sampled value of phase, bus voltage value and the above coordinate transform value is subjected to numerical analysis, and according to institute
It must be worth and be compared with the voltage, electric current, phase parameter of AC power grid, by control IPM driving and protection circuit, by PWM inversion
The output of device is with power network with the same phase of pressure.
Detailed description of the invention
Fig. 1 is the system hardware block diagram of the utility model three-phase grid-connected inverter.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.It is wherein different to implement
Similar component uses associated similar element numbers in mode.In the following embodiments, many datail descriptions are
In order to enable the application can be better understood.However, those skilled in the art can recognize without lifting an eyebrow, it is part of
Feature is dispensed in varied situations, or can be substituted by other elements, material, method.In some cases,
The relevant some operations of the application are there is no display in the description or describe, this is the core in order to avoid the application
It is flooded by excessive description, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary,
They can completely understand relevant operation according to the general technology knowledge of description and this field in specification.
A kind of three-phase grid-connected inverter circuit shown in Figure 1, including main circuit and control circuit, main circuit include straight
Flow lateral capacitance, PWM inverter and net side inductance；DC bus capacitor is arranged at DC source positive and negative end, DC bus capacitor both ends
The input terminal of PWM inverter is connected, the external three-phase electricity of the output end of PWM inverter is all connected with a net on three lines of three-phase electricity
Side inductance is simultaneously connected to power network；Control circuit includes dsp system, network voltage and phase detecting circuit, power network current detection electricity
Road, IPM driving and protection circuit and direct current bus voltage detecting circuit；Network voltage and phase detecting circuit connect in power network and
Between net side inductance, power network current detection circuit is connect between net side inductance and PWM inverter, and IPM driving connects with protection circuit
In PWM inverter, direct current bus voltage detecting circuit is connect on DC bus capacitor；Dsp system respectively with network voltage and phase
Position detection circuit, power network current detection circuit, IPM driving are connect with protection circuit and direct current bus voltage detecting circuit.
PWM inverter, be connected to DC terminal with exchange end, when DC bus-bar voltage exceed preset value when, system
Start inversion, which plays reversion reaction, direct current is converted to the alternating current with power grid same frequency, same-phase.
Network voltage and phase detecting circuit, are connected to grid side and dsp system, for acquire grid side voltage magnitude and
Its detected value is input to dsp system by grid side voltage-phase.
Power network current detection circuit, is connected to grid side and dsp system, using Hall sensor acquisition grid side electric current letter
Number, by it to being transmitted to dsp system.
Direct current bus voltage detecting circuit connects DC bus capacitor both ends and dsp system, for detecting DC bus-bar voltage
Value, if voltage value is higher than preset reference value, system starts inversion.
IPM driving and protection circuit, connect controllable rectifier bridge and dsp system, the PWM issued for receiving dsp system
Signal is converted into the available signal of IPM module, and protects IPM module, if over-voltage and over-current is to play the role of shutdown.
Dsp system is separately connected electricity using the DSPIC33FJ64GS606 of Microchip company as core processor
Net voltage and phase detecting circuit, power network current detection circuit, IPM driving and protection circuit and DC bus-bar voltage detection electricity
Road.For by power network current, voltage, the sampled value including its amplitude and phase to be coordinately transformed, by bus voltage value with
Upper coordinate transform value carries out numerical analysis, and is compared according to the voltage, electric current, phase of resulting value and the AC network, passes through
Control IPM driving and protection circuit make the output of PWM inverter with AC network with the same phase of pressure.
It is also connected with current foldback circuit between power network current detection circuit and dsp system, for preventing power network current
It is excessively high that entire circuit is damaged.
Voltage protection circuit is also connected between network voltage and phase detecting circuit and dsp system, for preventing electricity
Net voltage is excessive to damage entire circuit.
It drives and protects between circuit and dsp system in the IPM and be additionally provided with controllable rectifier bridge, being used for will be from DSP system
The pwm signal that receives of uniting is converted to driving signal and is transmitted to IPM driving and protection circuit, and protects IPM module, prevent by
Over-voltage, the destruction of overcurrent caused by due to network voltage shakiness.
The working principle of the utility model circuit is:
The dsp system of this practical information be separately connected network voltage and phase detecting circuit, power network current detection circuit,
IPM driving and protection circuit, direct current bus voltage detecting circuit.Dsp system is used for power network current, voltage, including its amplitude
It is coordinately transformed with the sampled value of phase, bus voltage value and the above coordinate transform value is subjected to numerical analysis, and according to institute
It must be worth and be compared with the voltage, electric current, phase parameter of AC power grid, by control IPM driving and protection circuit, by PWM inversion
The output of device is with power network with the same phase of pressure.
The two-way PWM frequency converter that the utility model three-phase grid-connected inverter circuit is constituted, is divided into prime energy feedback part
With rear class alternating current generator frequency changing driving system.When motor work is in motoring condition, system absorbs electric energy from power grid, grid side
Intelligent power module work works in rectification state, the intelligent power module of motor side in inverter mode.When motor work is being sent out
When electricity condition, in rectification state, the intelligent power module of grid side works in inversion shape for the intelligent power module work of motor side
State.The electric energy that motor generates is converted to direct current by motor side intelligent power module, by filtering, then passes through grid side intelligence function
Rate module inversion is the alternating current with the same amplitude of power grid, same-phase.
Use above specific case is illustrated the utility model, is merely used to help understand the utility model, and
Not to limit the utility model.Think of for those skilled in the art of the present invention, according to the utility model
Think, several simple deductions, deformation or replacement can also be made.
Claims (6)
1. a kind of three-phase grid-connected inverter circuit, it is characterised in that: including main circuit and control circuit, the main circuit includes straight
Flow filter, PWM inverter and net side inductance；The DC filter is arranged in DC source positive and negative end, DC filter
Both ends connect the input terminal of PWM inverter, and the external three-phase electricity of the output end of the PWM inverter connects on three lines of three-phase electricity
It connects a net side inductance and is connected to power network；The control circuit includes dsp system, network voltage and phase detecting circuit, electricity
Net current detection circuit, IPM driving and protection circuit and direct current bus voltage detecting circuit；The network voltage and phase-detection
Circuit connects between power network and net side inductance, and the power network current detection circuit connects between net side inductance and PWM inverter,
The IPM driving connects in PWM inverter with protection circuit, and the direct current bus voltage detecting circuit connects in DC filter
On；The dsp system drives and protection circuit with network voltage and phase detecting circuit, power network current detection circuit, IPM respectively
It is connected with direct current bus voltage detecting circuit.
2. three-phase grid-connected inverter circuit according to claim 1, it is characterised in that: driven in the IPM and protect circuit
Controllable rectifier bridge is additionally provided between dsp system.
3. three-phase grid-connected inverter circuit according to claim 1 or claim 2, it is characterised in that: the DC filter is connection
In the DC bus capacitor of DC source positive and negative end.
4. three-phase grid-connected inverter circuit according to claim 3, which is characterized in that the power network current detection circuit with
Current foldback circuit is also connected between the dsp system.
5. three-phase grid-connected inverter circuit according to claim 4, which is characterized in that in the network voltage and phase-detection
Voltage protection circuit is also connected between circuit and the dsp system.
6. three-phase grid-connected inverter circuit according to claim 5, which is characterized in that the dsp system includes
DSPIC33FJ64GS606 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920009605.5U CN209313455U (en) | 2019-01-03 | 2019-01-03 | A kind of three-phase grid-connected inverter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920009605.5U CN209313455U (en) | 2019-01-03 | 2019-01-03 | A kind of three-phase grid-connected inverter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209313455U true CN209313455U (en) | 2019-08-27 |
Family
ID=67680338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920009605.5U Expired - Fee Related CN209313455U (en) | 2019-01-03 | 2019-01-03 | A kind of three-phase grid-connected inverter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209313455U (en) |
-
2019
- 2019-01-03 CN CN201920009605.5U patent/CN209313455U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190827 Termination date: 20210103 |