CN105429462B - The control system of the multi-functional grid-connection converter of a kind of twin-stage and method thereof - Google Patents
The control system of the multi-functional grid-connection converter of a kind of twin-stage and method thereof Download PDFInfo
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- 230000005611 electricity Effects 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Abstract
The invention discloses control system and the method thereof of the multi-functional grid-connection converter of a kind of twin-stage, this system includes the prime control unit comprising MPPT controller being connected with DC/DC converter, and the rear class control unit being connected with DC/AC converter；Rear class control unit includes converter condition monitoring module, converter condition monitoring module is for obtaining the ac output current signal of DC/AC converter, and calculate the rate of change of described ac output current signal, rate of change according to calculating compares with default rate of change threshold value, obtains the running status of the multi-functional grid-connection converter of twin-stage；The output signal of converter condition monitoring module is sent to instruction current computing module, and instruction current computing module is additionally operable to receive output signal and the load current signal of MPPT controller；The output signal of instruction current computing module is modulated and forms the rear class pulse drive signal driving DC/AC converter to run.
Description
Technical field
The invention belongs to field of power, particularly relate to control system and the method thereof of the multi-functional grid-connection converter of a kind of twin-stage.
Background technology
The repeatedly large-scale blackout caused by cascading failure, and the bulk power grid off-the-line caused by extreme weather conditions, give tradition electricity
The security and stability content of net has beaten alarm bell.Additionally, the continuous consumption of fossil energy, energy crisis and environmental pollution is caused to be asked
Topic is day by day serious, and " green ", " low-carbon (LC) " become the active demand of power system development.Regenerative resource, including solar energy, wind
The characteristic of the aspects such as energy waits, pollution-free with it, renewable is increasingly paid attention to by academia and industrial quarters.In general, I
The new energy development of state mainly follows the principle that " centralized grid-connected " combines with " distributing access ".
First, in terms of " centralized grid-connected " pattern of regenerative resource, Opportunity coexists with challenge.China is vast in territory, scene
Regenerative resource aggregation zone presents contrary distribution in meeting in the heart.Make these large-scale scene power stations must pass through high pressure long distance
Just can send to meet end from transmission of electricity corridor.Due to wind speed and the unfavorable spy such as non-linear, the randomness of intensity of illumination and uncontrollability
Levying, the stable operation for power system that accesses in large-scale scene power station brings no small impact.In recent years, the wind frequently occurred
Electricity accident makes the grid-connected hourage of Large Scale Wind Farm Integration on the low side, and brings huge challenge to the stabilization of power grids, " abandons in a large number simultaneously
Wind " not only have impact on the recovery of cost of investment, also create the huge wasting of resources.
Secondly, in terms of regenerative resource " distributing access " pattern, potentiality and full of potential.Due to distribution type renewable energy
And net unit is near meeting end, eliminates extensive long-distance transmissions process.And single power supply capacity is less, electrical network is rushed
Hit less than extensive scene power station.
Additionally, result of study shows, distributed generation system is while the extensive regenerative resource of solution is grid-connected, for improving
The stability tool of power system is of great significance.Everything is all greatly promoted the distribution comprising various regenerative resource
The fast development of formula generation technology, is more listed in a big important component part of intelligent grid.Owing to wind energy, photovoltaic etc. are renewable
The energy has the feature of intermittence, randomness, is typical uncontrollable source.The most preferably by these uncontrollable renewable energies
Electrical network is accessed in source, is the big study hotspot of for a long time.In order to solve this technical barrier, scholar is had to propose micro-capacitance sensor
Concept.Micro-capacitance sensor as a kind of special distributed generation system, be integrated with multiple renewable energy sources, energy storage, local load,
Monitor the local power system of protection and control unit, recently obtained studying widely.
In distributed power generation and micro-capacitance sensor technology, various regenerative resources or energy-storage system are it is generally required to using inverter as grid-connected
Interface.Generally, combining inverter can be divided into single-stage and multistage two big classes.Owing to progression is the most, component used is the most,
The efficiency of system is the lowest, and the most multistage combining inverter generally only has two-stage.
But, tradition grid-connection converter mostly can only be rigidly to the fundamental frequency watt current of electrical network output pure sinusoid.Along with greatly
Scale regenerative resource accesses power distribution network by micro-capacitance sensor dispersedly, and this kind of rigidity combining inverter in micro-capacitance sensor is faced with more to come
The most technical barriers.Wherein, the power quality problem of micro-capacitance sensor belongs to important one therein.Micro-capacitance sensor is contained within substantial amounts of
Power electronic equipment, is likely to containing substantial amounts of non-linear, uneven and load or burden without work in addition in localised load, these all poles
The earth is degrading the quality of power supply at micro-capacitance sensor point of common coupling (Point of Common Coupling, PCC) place.The electric energy of micro-capacitance sensor
Quality is directly connected to micro-capacitance sensor safety and stability and economical operation.On the one hand, the quality of power supply at micro-capacitance sensor PCC point is by direct shadow
Ring to micro-capacitance sensor internal loading and the stable operation of combining inverter.Severe quality of power supply environment is except making sensitive load, key
Outside load cisco unity malfunction, go back the entail dangers to stable operation to combining inverter self.Owing to combining inverter typically connects
In the low-pressure side of power distribution network transformer, if containing more nonlinear-load in micro-capacitance sensor, then the voltage at PCC there may be relatively
Big harmonic distortion.This will directly influence voltage control loop and the current regulator of grid-connection converter so that it is output electric current contains
Bigger harmonic component.Under serious conditions, result even in grid-connection converter and trip because losing stable.
In order to reduce the cost of power quality controlling in distributed generation system and micro-capacitance sensor, operation maintenance multiplexing and device volume,
Improve the cost performance of existing combining inverter, have scholar to propose the concept of multi-functional grid-connection converter.So-called multi-functional grid-connected change
Parallel operation is i.e. to be compounded with combining inverter to complete regenerative resource or the grid-connected function of energy storage micro battery and some other such as electric energy is controlled
The combining inverter of the functions such as reason.For the multiple stage power electronic equipment that function separates, this multi-functional combining inverter
Use same set of device, the additional functions such as quality of power supply regulation can be completed while grid-connected, significantly reduce the investment of system
And volume, it is particularly suited for distributed generation system.
The basic controlling of the multi-functional grid-connection converter of twin-stage is mainly calculated by MPPT control, instruction current, output current tracking control
Make and modulate a few part composition.Wherein, multi-functional grid-connection converter be different from tradition grid-connection converter it is critical that instruction
The calculating section of electric current.For only having the multifunctional converter of grid-connect mode, when grid voltage sags, if grid-connection converter
Off-the-line may bring de-stabilising effect to electrical network, even causes comprehensive paralysis of electrical network time serious.In that case, instruction electricity
The calculation of stream translates into suppression and the reactive-load compensation of negative-sequence current, and then ensures that grid-connection converter is fallen in line voltage symmetry
Good low voltage crossing effect it is respectively provided with when falling with asymmetric falling.At present, there is following point in multifunctional converter: not
With switch speed under operating condition is slow and also fluctuation of service in handoff procedure.
Summary of the invention
In order to improve operation stability and the transient stability of twin-stage multifunctional converter, it is multi-functional that the present invention proposes a kind of twin-stage
The control system of grid-connection converter and method thereof.
To achieve these goals, the present invention adopts the following technical scheme that
The control system of the multi-functional grid-connection converter of a kind of twin-stage, the multi-functional grid-connection converter of described twin-stage includes being sequentially connected in series
Micro battery, DC/DC converter, DC/AC converter and wave filter；
This control system includes the prime control unit comprising MPPT controller being connected with described DC/DC converter, and with
The rear class control unit that described DC/AC converter is connected；
Described rear class control unit includes that converter condition monitoring module, described converter condition monitoring module are used for obtaining
Take the ac output current signal of DC/AC converter, and calculate the rate of change of described ac output current signal, according to calculate
Rate of change compares with default rate of change threshold value, obtains the running status of the multi-functional grid-connection converter of described twin-stage；
The output signal of described converter condition monitoring module is sent to instruction current computing module, and described instruction current calculates
Module is additionally operable to receive output signal and the load current signal of MPPT controller；The output signal warp of instruction current computing module
Modulation forms the rear class pulse drive signal driving DC/AC converter to run.
Described converter condition monitoring module, including the first voltage acquisition module, it is used for gathering the output of DC/DC converter
Voltage is also sent to instruction current computing module；And the second current acquisition module, it is used for gathering DC/AC converter output loading
Current signal, is also sent to instruction current computing module；And
First current acquisition module, it, for gathering the ac output current signal of DC/AC converter, is sent to DSP module
In carry out calculating the rate of change of described ac output current signal；The rate of change of the ac output current signal after calculating is sent to patrol
Collect judge module, and compare with default rate of change threshold value, obtain the running status of the multi-functional grid-connection converter of described twin-stage.
Described first current acquisition module is Hall current transformer.
Described second current acquisition module is Hall current transformer.
Described first voltage acquisition module is Hall voltage transformer.
A kind of control method of the control system of the multi-functional grid-connection converter of twin-stage, including:
Step (1): the voltage of micro battery output carries out the maximal power tracing of micro battery through DC-DC converter, and DC/AC becomes
The DC voltage inversion that DC-DC converter is exported by parallel operation is alternating current and exports；
Step (2): detect the current operating conditions of the multi-functional grid-connection converter of described twin-stage, if the multi-functional grid-connected change of described twin-stage
Parallel operation is in transient process, then promote DC reference voltage, and described DC reference voltage is DSP internal preset definite value；Otherwise,
The current operating conditions maintaining the multi-functional grid-connection converter of twin-stage is constant.
The process of the current operating conditions of the detection multi-functional grid-connection converter of described twin-stage in described step (2), including:
Step (2.1): consider the normal fluctuation of described twin-stage multi-functional grid-connection converter output electric current, set current changing rate
Threshold value；
Step (2.2): gather ac output current signal and calculate the rate of change of described ac output current signal；
Step (2.3): the rate of change of the ac output current signal after calculating compares with default rate of change threshold value, obtains described
The running status of the multi-functional grid-connection converter of twin-stage:
If the multi-functional grid-connection converter of described twin-stage is in transient process, then promotes described DC reference voltage, and enter step
(2.4)；Otherwise, the current operating conditions maintaining the multi-functional grid-connection converter of twin-stage is constant；
Step (2.4): continue to calculate the rate of change of ac output current signal, until it is less than presetting rate of change threshold value, institute
Stating DC reference voltage to recover to previous level, transient process terminates.
In described step (2.2), the first current acquisition module is used to be acquired ac output current signal.
In described step (2.2), ac output current signal is sent to DSP module, and calculates described in DSP module
The rate of change of ac output current signal.
In step (2.3), the rate of change of the ac output current signal after calculating is sent to logic judgment module, and in logic
Judge module compares with default rate of change threshold value, obtains the running status of the multi-functional grid-connection converter of described twin-stage.
The invention have the benefit that
The present invention, by calculating output current change rate, quickly determines whether twin-stage multifunctional converter system is in transient process.
Only by the direct-current chain capacitance voltage level of lifting prime DC/DC booster circuit, can effectively shorten the system transient modelling response time,
Be conducive to the job stability of raising system.
Accompanying drawing explanation
Fig. 1 is typical two-stage grid-connected transformer configuration.
Fig. 2 is typical case's single-stage grid-connection converter structure.
Fig. 3 is the traditional control method of twin-stage multifunctional converter.
Fig. 4 is system condition Logic judgment flow process.
Fig. 5 is the transient state rapid response type twin-stage multifunctional converter control mode that the present invention proposes.
Detailed description of the invention
The present invention will be further described with embodiment below in conjunction with the accompanying drawings:
Typical two-stage grid-connected inverter structure is as it is shown in figure 1, by DC/DC DC converter and DC/AC combining inverter group
Become.Wherein, DC/DC converter is generally used for realizing the MPPT maximum power point tracking of blower fan or photovoltaic, or controls the double of energy storage device
To energy flow；And DC/AC converter is for controlling to inject power and the electric current of electrical network.Control more flexibly owing to it has
Function and broader direct current power source voltage access scope, are more suitable for the grid-connected system of low capacity.
In FIG, micro battery include photovoltaic cell, energy storage device or blower fan output rectified after the DC voltage that obtains.DC/DC
Converter includes the lc circuit being connected in series, and is connected in first switching tube at lc circuit two ends in parallel, described first switch
Tie point and the second switch pipe of second switch pipe, described first switching tube and electric capacity also it is serially connected with at the tie point of pipe and inductance
The other end be parallel with the output capacitance of DC/DC converter.Wherein, wave filter is high pass LC filter circuit.
Single-stage converter structure is as in figure 2 it is shown, single-stage converter contains only DC/AC grid-connection converter, and this grade of converter must be same
Time complete all functions of two-stage grid-connected inverter.Compared with two-stage grid-connected converter, the component of single-stage grid-connection converter is less,
Take volume less, additionally there is efficient, the advantage of low cost, high reliability, be primarily adapted for use in Large Copacity grid-connected system.
The present invention is only for two-stage grid-connected transformer configuration.
The basic controlling block diagram of the multi-functional grid-connection converter of twin-stage as it is shown on figure 3, mainly calculated by MPPT control, instruction current,
Output current follow-up control and modulation this four part composition.
As it is shown in figure 5, the control system of the multi-functional grid-connection converter of the twin-stage of the present invention, wherein, twin-stage is multi-functional and net transformation
Device includes micro battery, DC/DC converter, DC/AC converter and the wave filter being sequentially connected in series；
This control system includes the prime control unit comprising MPPT controller being connected with described DC/DC converter, and with
The rear class control unit that described DC/AC converter is connected；
Described rear class control unit includes that converter condition monitoring module, described converter condition monitoring module are used for obtaining
Take the ac output current signal of DC/AC converter, and calculate the rate of change of described ac output current signal, according to calculate
Rate of change compares with default rate of change threshold value, obtains the running status of the multi-functional grid-connection converter of described twin-stage；
The output signal of described converter condition monitoring module is sent to instruction current computing module, and described instruction current calculates
Module is additionally operable to receive output signal and the load current signal of MPPT controller；The output signal warp of instruction current computing module
Modulation forms the rear class pulse drive signal driving DC/AC converter to run.
Further, converter condition monitoring module, including the first voltage acquisition module, it is used for gathering DC/DC conversion
Device output voltage is also sent to instruction current computing module；And the second current acquisition module, it is defeated that it is used for gathering DC/AC converter
Go out load current signal, be also sent to instruction current computing module；And
First current acquisition module, it, for gathering the ac output current signal of DC/AC converter, is sent to DSP module
In carry out calculating the rate of change of described ac output current signal；The rate of change of the ac output current signal after calculating is sent to patrol
Collect judge module, and compare with default rate of change threshold value, obtain the running status of the multi-functional grid-connection converter of described twin-stage.
Wherein, the first current acquisition module is Hall current transformer.
Second current acquisition module is Hall current transformer.
First voltage acquisition module is Hall voltage transformer.
Wherein, instruction current computing module includes that the active current that prime MPPT exports receives, and maintains DC-link voltage permanent
Surely the reference current produced after being modulated, harmonic wave and idle component in load current are extracted.
The control system of the multi-functional grid-connection converter of twin-stage based on the present invention, its control method, including:
Step (1): the voltage of micro battery output carries out the maximal power tracing of micro battery through DC-DC converter, and DC/AC becomes
The DC voltage inversion that DC-DC converter is exported by parallel operation is alternating current and exports；
Step (2): detect the current operating conditions of the multi-functional grid-connection converter of described twin-stage, if the multi-functional grid-connected change of described twin-stage
Parallel operation is in transient process, then promote DC reference voltage, and described DC reference voltage is DSP internal preset definite value；Otherwise,
The current operating conditions maintaining the multi-functional grid-connection converter of twin-stage is constant.
As shown in Figure 4, the process of the current operating conditions of the detection multi-functional grid-connection converter of described twin-stage in step (2), including:
Step (2.1): consider the normal fluctuation of described twin-stage multi-functional grid-connection converter output electric current, set current changing rate
Threshold value；
Step (2.2): gather ac output current signal and calculate the rate of change of described ac output current signal；
Step (2.3): the rate of change of the ac output current signal after calculating compares with default rate of change threshold value, obtains described
The running status of the multi-functional grid-connection converter of twin-stage:
If the multi-functional grid-connection converter of described twin-stage is in transient process, then promotes described DC reference voltage, and enter step
(2.4)；Otherwise, the current operating conditions maintaining the multi-functional grid-connection converter of twin-stage is constant；
Step (2.4): continue to calculate the rate of change of ac output current signal, until it is less than presetting rate of change threshold value, institute
Stating DC reference voltage to recover to previous level, transient process terminates.
In described step (2.2), the first current acquisition module is used to be acquired ac output current signal.
In described step (2.2), ac output current signal is sent to DSP module, and calculates described in DSP module
The rate of change of ac output current signal.
In step (2.3), the rate of change of the ac output current signal after calculating is sent to logic judgment module, and in logic
Judge module compares with default rate of change threshold value, obtains the running status of the multi-functional grid-connection converter of described twin-stage.
The general principle of the method for the present invention is:
Twin-stage multi-functional grid-connection converter structure is as it is shown in figure 1, in transient process, AC row are write dynamical equation is
Wherein, VdcRepresent direct-current chain capacitance voltage, VsRepresent AC system voltage effective value, L representation transformation device output filtered electrical
Sense, Δ iLFor output current change quantity, Δ iL/ Δ t represents output current changing rate.
Initially with output electric current iLSample, and it is inputted to DSP, calculating current rate of change.If this rate of change is big
In threshold value, can assert that two-stage converter system is in transient process, suitably adjust DC-link voltage level, will direct-current chain electricity
Hold Voltage Reference by VDc, refIt is raised to Vdc,ref*。
From formula (1), when line voltage keeps stable, and output filtering parameter does not changes, suitable lifting direct-current chain electricity
Voltage levels, can improve the transient response speed of system, i.e. at Δ iLIn the case of Yi Ding, when can effectively reduce transient response
Between Δ t, improve the transient stability of twin-stage multifunctional converter.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope
System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay
Go out various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. the control system of the multi-functional grid-connection converter of twin-stage, it is characterised in that described twin-stage multi-functional grid-connection converter bag
Include micro battery, DC/DC converter, DC/AC converter and the wave filter being sequentially connected in series；
This control system includes the prime control unit comprising MPPT controller being connected with DC/DC converter, and and DC/AC
The rear class control unit that converter is connected；
Described rear class control unit includes that converter condition monitoring module, described converter condition monitoring module are used for obtaining
Take the ac output current signal of DC/AC converter, and calculate the rate of change of described ac output current signal, according to calculate
Rate of change compares with the threshold value of current changing rate, obtains the running status of the multi-functional grid-connection converter of described twin-stage；
The output signal of described converter condition monitoring module is sent to instruction current computing module, and described instruction current calculates
Module is additionally operable to receive output signal and the load current signal of MPPT controller；The output signal warp of instruction current computing module
Modulation forms the rear class pulse drive signal driving DC/AC converter to run；
If the multi-functional grid-connection converter of twin-stage is in transient process, then promote DC reference voltage；Otherwise, maintain twin-stage multi-functional
The current operating conditions of grid-connection converter is constant.
The control system of the multi-functional grid-connection converter of a kind of twin-stage the most as claimed in claim 1, it is characterised in that described conversion
Device condition monitoring module, including the first voltage acquisition module, it is used for gathering DC/DC converter output voltage and is sent to refer to
Make current calculation module；And the second current acquisition module, it is used for gathering DC/AC converter output load current signal, also passes
Deliver to instruction current computing module；And
First current acquisition module, it, for gathering the ac output current signal of DC/AC converter, is sent to DSP module
The rate of change of middle calculating described ac output current signal；The rate of change of the ac output current signal after calculating is sent to logic and sentences
Disconnected module, and compare with the threshold value of current changing rate, obtain the running status of the multi-functional grid-connection converter of described twin-stage.
The control system of the multi-functional grid-connection converter of a kind of twin-stage the most as claimed in claim 2, it is characterised in that described first
Current acquisition module is Hall current transformer.
The control system of the multi-functional grid-connection converter of a kind of twin-stage the most as claimed in claim 2, it is characterised in that described second
Current acquisition module is Hall current transformer.
The control system of the multi-functional grid-connection converter of a kind of twin-stage the most as claimed in claim 2, it is characterised in that described first
Voltage acquisition module is Hall voltage transformer.
6. a control method for the control system of the multi-functional grid-connection converter of twin-stage as described in claim 1-5 is arbitrary, it is special
Levy and be, including:
Step (1): the voltage of micro battery output carries out the maximal power tracing of micro battery through DC/DC converter, and DC/AC becomes
The DC voltage inversion that DC/DC converter exports is alternating current and exports by parallel operation；
Step (2): detect the current operating conditions of the multi-functional grid-connection converter of described twin-stage, if the multi-functional grid-connected change of described twin-stage
Parallel operation is in transient process, then promote DC reference voltage, and described DC reference voltage is DSP internal preset definite value；Otherwise,
The current operating conditions maintaining the multi-functional grid-connection converter of twin-stage is constant.
7. the control method of the control system of the multi-functional grid-connection converter of twin-stage as claimed in claim 6, it is characterised in that institute
State the process of the current operating conditions of the detection multi-functional grid-connection converter of described twin-stage in step (2), including:
Step (2.1): consider the normal fluctuation of described twin-stage multi-functional grid-connection converter output electric current, set current changing rate
Threshold value；
Step (2.2): gather ac output current signal and calculate the rate of change of described ac output current signal；
Step (2.3): the rate of change of ac output current signal after calculating compares with the threshold value of current changing rate, obtains institute
State the running status of the multi-functional grid-connection converter of twin-stage:
If the multi-functional grid-connection converter of described twin-stage is in transient process, then promotes described DC reference voltage, and enter step
(2.4)；Otherwise, the current operating conditions maintaining the multi-functional grid-connection converter of twin-stage is constant；
Step (2.4): continue to calculate the rate of change of ac output current signal, until it is less than the threshold value of current changing rate,
Described DC reference voltage recovers to previous level, and transient process terminates.
8. the control method of the control system of the multi-functional grid-connection converter of twin-stage as claimed in claim 7, it is characterised in that
In described step (2.2), the first current acquisition module is used to gather ac output current signal.
9. the control method of the control system of the multi-functional grid-connection converter of twin-stage as claimed in claim 8, it is characterised in that
In described step (2.2), ac output current signal is sent to DSP module, and it is defeated to calculate described exchange in DSP module
Go out the rate of change of current signal.
10. the control method of the control system of the multi-functional grid-connection converter of twin-stage as claimed in claim 7, it is characterised in that
In step (2.3), the rate of change of the ac output current signal after calculating is sent to logic judgment module, and at Logic judgment
Module compares with the threshold value of current changing rate, obtains the running status of the multi-functional grid-connection converter of described twin-stage.
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| CN201510906371.0A CN105429462B (en) | 2015-12-09 | 2015-12-09 | The control system of the multi-functional grid-connection converter of a kind of twin-stage and method thereof |
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