CN106130061A - The soft start of a kind of energy storage inverter in parallel runs system and method - Google Patents
The soft start of a kind of energy storage inverter in parallel runs system and method Download PDFInfo
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- CN106130061A CN106130061A CN201610408884.3A CN201610408884A CN106130061A CN 106130061 A CN106130061 A CN 106130061A CN 201610408884 A CN201610408884 A CN 201610408884A CN 106130061 A CN106130061 A CN 106130061A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The present invention relates to micro-capacitance sensor field, the soft start particularly relating to a kind of energy storage inverter in parallel runs system and method.The present invention sends the soft start order frequency signal according to the output voltage of main inversion unit self by a main inversion unit, amplitude signal and phase signal are to from inversion unit, frequency from the output voltage of inversion unit Yu the output voltage of main inversion unit is made according to the frequency signal received and amplitude signal by droop control according to soft start order from inversion unit, amplitude is essentially identical, technique scheme is capable of during the output of multiple stage energy storage inverter off-network realizing and the function of machine soft start, reduce the impact to micro-capacitance sensor load, improve reliability and the load capacity of inverter of also machine under island mode.
Description
Technical field
The present invention relates to micro-capacitance sensor and storage energy operation field, the soft start particularly relating to a kind of energy storage inverter in parallel runs
System and method.
Background technology
In a distributed manner based on generation technology, concentrated-distributed power supply, energy-storage units and controllable burden, in the microgrid of one, are
The important component part that following intelligent grid is built.Controlled by coordination between microgrid and bulk power grid, can grid-connected and isolated island two
Plant mode operation.Along with the rise of micro-grid system, occur in that the energy-storing and power-generating system of differently composed form, such as light storage generating system
System, wind storage electricity generation system, wind and solar hybrid generating system and wind-light storage hybrid power system etc..As in microgrid in energy-storage units
Requisite link, it is ensured that the harmony of distributed power supply and seriality and the reduction accident shadow to system
Ring, improving new energy power generation grid-connection performance, improving power quality, balance generated output and workload demand, raising electric energy
The aspects such as utilization ratio, reduction system dynamics change play an important role.Inverter under island mode, in energy-storage units
Mode in parallel is the load supplying in micro-grid system jointly.
At present under piconet island pattern, the research in parallel of energy storage off-network inverter mainly bias toward Parallel Control algorithm and
Improving in the reliability of microgrid energy storage inverter, when running for energy storage inverter off-network machine, soft start the most do not mentioned by document
Link.Micro-grid system typically there is the parallel connection of multiple stage energy storage inverter jointly provide electric energy to load under island mode, traditional
Droop control algorithm cannot ensure that the energy storage inverter of multiple stage parallel connection realizes and machine during soft start.Due to energy storage inversion
Device and load capacity are distributed uncertain, and traditional way is common to negative again after multiple stage parallel connection energy storage inverter soft start completes
Carry power supply, although so can ensure that energy storage inverter capacity and load coupling in the micro-grid system of local, it is to avoid occur single
Platform energy storage inverter band carries startup scheme and is likely to result in high load with small power phenomenon.But conventionally by multiple inverters
Parallel connection complete after again band carry and also the power supply of energy storage inverter in parallel and the load with capacitance characteristic can be impacted, have
The switching tube in inverter may be damaged, affect its service life.Affect the reliability of micro-capacitance sensor under island mode.
Summary of the invention
The problem existed for prior art, the soft start now providing a kind of energy storage inverter in parallel runs system and side
Method, it is possible to solve the band load impact during the also machine of multiple energy storage inverter under island mode, improve under island mode overall
Nonlinear load load capacity, reduces the response time of the power supply of load, it is achieved micro-capacitance sensor independence stable operation.
Concrete technical scheme is as follows:
The soft start of a kind of energy storage inverter in parallel runs system, is applied under the island mode of micro-capacitance sensor, described operation
System include main inversion unit and be connected with described main inversion unit at least one from inversion unit；Wherein, described main inversion
Unit includes:
Soft-start module, in order to terminate order to described from inversion unit transmission soft start initiation command and soft start；Frequently
Rate module, the most described from inversion in order to the frequency signal and phase signal obtaining and exporting the output voltage of described main inversion unit
Unit；
Amplitude module, in order to obtain and to export the reference signal of the output voltage virtual value of described main inversion unit to described
From inversion unit；
Described main inversion unit when soft start according to described main inversion unit output active power and reactive power, depend on
Output voltage amplitude and frequency according to main inversion unit described in sagging algorithm controls；
Described include from inversion unit:
Droop control module, is connected with described soft-start module, frequency cells, described amplitude unit, respectively in order to soft
The sagging algorithm controls output voltage frequency from inversion unit and width is used according to active power of output and reactive power during startup
Value.
Preferably, described frequency module includes:
Pulse unit, in order to obtain the pulse signal of the output voltage of described main inversion unit, and according to described pulse
Signal obtains described frequency signal and output voltage phase signal；
Transmitting element, is connected with described pulse unit, in order to export described frequency signal to described from inversion unit.
Preferably, described amplitude module includes:
Coding unit, in order to output after described reference signal being encoded to described from inversion unit.
Preferably, described also include from inversion unit:
Decoder module, is connected with described coding unit, described droop control module respectively, in order to the described reference to coding
Signal decodes, and reduces described reference signal.
Preferably, described also include from inversion unit:
Input module, is connected with described frequency module respectively, in order to input described frequency signal.
Preferably, described droop control module includes:
Meritorious unit, in order to be adjusted the described output voltage amplitude from inversion unit；
Idle unit, in order to be adjusted the described output voltage frequency from inversion unit.
Preferably, described droop control module also includes:
Feed forward element, in order to carry out feed-forward regulation to the reference signal of the output voltage virtual value of described main inversion unit；
Feedback unit, in order to carry out feedback regulation to the virtual value of the described output voltage from inversion unit.
The soft start operation method of a kind of energy storage inverter in parallel, is applied in micro-grid energy storage system, including:
Step S1, after the main power source power-off of micro-capacitance sensor, accessory power supply starts main inversion unit by a soft-start module；
Step S2, described main inverter unit carries out droop control, and handle according to active power and the reactive power of output
Voltage effective value reference signal, output voltage phase signal and the output frequency phase signal of the output of described main inverter unit are same
Step is sent to from inversion unit；
Step S3, obtains and exports the frequency plot signal of the output voltage of described main inversion unit and described main inversion list
The reference signal of the output voltage virtual value of unit；
Step S4, described from inversion unit according to the frequency plot signal of described main inversion unit and reference signal according to institute
State active power and reactive power from the output of inversion list and carry out described in droop control the frequency from the output voltage of inversion unit
And amplitude.
Preferably, described step S3 specifically includes:
Step S31, obtains the zero crossing pulse signal of the output voltage of described main inversion unit, and according to described pulse
Signal obtains described frequency signal；
Step S32, output voltage virtual value reference signal is encoded by described main inversion unit；
Step S33, described main inversion unit exports described frequency plot signal and output voltage virtual value encodes signal extremely
Described from inversion unit.
Preferably, described step S4 specifically includes:
Step S41, described from inversion unit by the output voltage virtual value reference signal of described main inversion unit of coding
Decoding, is reduced to described from the output voltage virtual value reference signal of inversion unit；
Step S42 is described effective according to the output voltage of described frequency signal and described main inversion unit from inversion unit
Value reference signal regulation is described from the frequency of the output voltage of inversion unit, phase and amplitude.
Technique scheme provides the benefit that: use the program to can ensure that energy storage inverter is permissible under island mode
Realize soft start in parallel, common powering load, reduce the mutual impact between isolated island power supply and load, improve microgrid lonely
Under the pattern of island, nonlinear-load band carries capacity and the reliability of power supply.
Technique scheme sends frequency signal and the amplitude of the output voltage of main inversion unit by a main inversion unit
Signal, to from inversion unit, is made from inversion unit by droop control according to frequency signal and amplitude signal from inversion unit
Output voltage and the frequency of the output voltage of main inversion unit, amplitude are identical, and it is inverse that technique scheme is capable of multiple stage energy storage
Realizing and the function of machine soft start when becoming device off-network (i.e. island mode) output, reduce in micro-capacitance sensor, moment throws with not controlling
The impact to inverter of the nonlinear load such as rectification type, capacitive, improves reliability and the load capacity of inverter of also machine.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the soft start operation system of a kind of energy storage inverter in parallel of the present invention；
Fig. 2 is the workflow diagram of the embodiment of droop control module of the present invention；
Fig. 3 is the flow chart of the embodiment of the soft start operation method of a kind of energy storage inverter in parallel of the present invention.
Detailed description of the invention
It should be noted that in the case of not conflicting, following technical proposals, can be mutually combined between technical characteristic.
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further described:
The soft start present embodiments providing a kind of energy storage inverter in parallel runs system, is applied to the isolated island mould of micro-capacitance sensor
Under formula, operation system include main inversion unit and be connected with main inversion unit at least one from inversion unit；As it is shown in figure 1,
Wherein, main inversion unit includes:
Soft-start module, in order to send, to from inversion unit, the order that soft start starts and terminates；Frequency module, in order to obtain
Take and export the frequency plot signal of output voltage of main inversion unit to from inversion unit；
Amplitude module, in order to obtain and to export the reference signal of the output voltage virtual value of main inversion unit to from inversion list
Unit；
Main inversion unit can export active reactive power according to sagging algorithm controls when soft start according to main inversion unit
The output voltage frequency of main inversion unit and amplitude.
Include from inversion unit:
Droop control module, is connected with soft-start module, frequency cells, amplitude unit, respectively in order to according to frequency plot
Signal and voltage effective value reference signal use sagging algorithm controls from the output voltage frequency of inversion unit, phase and amplitude.
In the present embodiment, soft-start module notifies start from inversion unit and complete inverter by the way of low and high level
And machine soft start；The phase in the moment of two zero crossings in the cycle being main frame output voltage that frequency module obtains
Position, is sent to from inversion unit by pulse signal, obtains the frequency of the frequency module output of main inversion unit from inversion unit
Signal, such as, locked the output voltage of main inversion unit by the rising edge according to the pulse signal obtained and trailing edge
Phase, so that keeping consistent from the output voltage of inversion unit with the phase place of the output voltage of main inversion unit.
In one preferred embodiment of the present invention, frequency module includes:
Pulse unit, in order to obtain the pulse signal of the output voltage of main inversion unit, and obtains according to pulse signal
Frequency plot signal；
Transmitting element, is connected with pulse unit, in order to output frequency signal to from inversion unit.
In the present embodiment, the pulse unit of main inversion unit is two mistakes in main inversion unit output voltage one cycle
The moment of zero point is sent to from inversion unit by low and high level, from inversion unit according to the rising edge captured and the arteries and veins of trailing edge
Rush signal, parallel connection energy storage inverter output voltage phase place is kept consistent with main inversion unit output voltage phase place.
In one preferred embodiment of the present invention, amplitude module includes:
Coding unit, in order to output after output voltage virtual value reference signal being encoded to from inversion unit.
In one preferred embodiment of the present invention, also include from inversion unit:
Decoder module, is connected with coding unit, droop control module respectively, in order to the reference signal decoding to coding, also
Former reference signal.
In the present embodiment, the coding unit of main inversion unit is the reference signal main inversion unit output voltage virtual value
By the way of rapid communication, quick real-time informing is from inversion unit, from inversion unit to be converted to the less binary code of figure place
Decoding unit be that the binary code that main inversion unit is sent is reduced into from inversion according to main inversion unit coding rule
The virtual value reference signal of unit output voltage.
In one preferred embodiment of the present invention, also include from inversion unit:
Input module, is connected with frequency module respectively, in order to carry out phase-locked from inverter；
In one preferred embodiment of the present invention, institute's droop control module includes:
Meritorious unit, in order to be adjusted from the output voltage amplitude of inversion unit；
Idle unit, in order to be adjusted from the output frequency of inversion unit.
In the present embodiment, such as, such as Fig. 2, each magnitude of voltage from self output of inversion unit detection and current value；Accordingly
Calculate active power and reactive power, obtain output voltage frequency instruction to be adjusted based on droop characteristic and amplitude refers to
Order, then instructs according to frequency instruction and amplitude, adjusts the anti-phase fine setting of pwm control signal from inversion unit by sagging algorithm
The amplitude of output voltage and frequency, thus reach the reasonable distribution of different inverter output power.If that is, energy storage off-network inversion
Device output impedance presents resistive, then output voltage amplitude is declined by the active power exported by energy storage inverter, logical
Output frequency is declined by the reactive power crossing energy storage inverter output.Balance different inversion when so can play soft start
The purpose of device output, but owing to the amplitude of output voltage is declined, so the reference of actual inverter voltage all can
Slightly below main frame and the voltage reference value from machine, in order to prevent output voltage bigger with reference to declining, in addition it is also necessary to add output
Voltage effective value feedback loop.
In one preferred embodiment of the present invention, institute's droop control module includes:
Feed forward element, in order to carry out feed-forward regulation to the reference signal of the output voltage virtual value of main inversion unit；
Feedback unit, in order to carry out feedback regulation to from the virtual value of the output voltage of inversion unit.
In the present embodiment, such as Fig. 2, main inversion unit according to the reference signal of output voltage virtual value progressively to from inversion list
Unit's voltage output amplitude carries out lifting, and the voltage effective value reference signal sended over main inversion unit from inversion unit is carried out
The mode feedovered by voltage effective value after acquisition combines real-time voltage virtual value feedback compensation link and obtains the width from inversion unit
Value instruction.Present resistive feature according to from inversion unit output impedance again, be respectively adopted active power and reactive power to it
Output voltage amplitude and frequency carry out droop control.
Present embodiments provide the soft start control method of a kind of energy storage inverter in parallel, be applied in micro-capacitance sensor, such as Fig. 3
Shown in, including:
Step S1, after the main power source power-off of micro-capacitance sensor, accessory power supply starts main inversion unit by a soft-start module,
Notify that the output voltage virtual value reference from inverter reception main inverter and frequency and phase reference are believed by soft earthquake module
Number；Main inverter is needed, according to its active reactive power exported, output voltage and frequency are carried out droop control；
Step S2, obtains and exports frequency plot signal and the output of main inversion unit of the output voltage of main inversion unit
The reference signal of voltage effective value；
Step S3, the frequency plot signal sent out according to main inversion unit from inversion unit and voltage effective value reference signal
Carry out phase-locked, also synchronize carry out droop control, it is ensured that in soft start-up process main frame (main inversion unit) and from machine (from inversion list
Unit) output voltage and frequency approximately equal, the most all inverter output power are approximately the same.
Step S4, main inverter carries after sending output voltage amplitude and certain setting time interval of frequency plot information again
High output voltage virtual value amplitude is also and frequency plot signal synchronizes to issue from inverter.
Step S5, indicates that after main inverter output voltage amplitude brings up to setting value soft start completes, and main inverter is soft
Start module notice to terminate from machine soft start, from the output voltage information of machine no longer Receiving Host, only receive frequency signal conduct
From the foundation that machine is phase-locked, from machine according to the fixed voltage virtual value reference set, carry out nothing by droop control algorithm and main frame
Line machine.
In the present embodiment, main inversion unit and can be all energy storage inverter from inversion unit.
In one preferred embodiment of the present invention, step S2 specifically includes:
Step S21, obtains output voltage virtual value and the pulse signal of output voltage zero crossing of main inversion unit, and
Carry out phase-locked according to pulse signal, obtain from machine output voltage virtual value reference and output voltage phase signal；
Step S22, voltage effective value reference signal is encoded by main inversion unit；
Step S23, the reference signal of main inversion unit output voltage, frequency signal and coding is to from inversion unit.
In one preferred embodiment of the present invention, step S3 specifically includes:
Step S31, from inversion unit by the reference signal decoding of coding, the reference signal of reduction；
Step S32, regulates the frequency of the output voltage from inversion unit from inversion unit according to frequency signal and reference signal
Rate and amplitude.
In above-described embodiment, and in machine soft start-up process, main inversion unit can be according to the zero passage of self output voltage reference
It, to from inversion unit, is carried out phase-locked from inversion unit according to pulse signal, adjusts from inversion unit by some transmission pulse signal
The phase place of output voltage, it is ensured that keep consistent with the phase place of main inversion unit output voltage from inversion unit.Main inversion unit meeting
The voltage effective value reference signal that output voltage in main inversion unit soft start-up process is changed is converted to figure place less two
Carry system code by the way of rapid communication quick real-time informing from inversion unit.From inversion unit by decoding main inversion list
The binary code that unit sends is reduced into from inversion unit soft start output voltage reference according to main inversion unit coding rule
Signal, as from the output voltage virtual value reference signal of inversion unit soft start-up process.Main inversion unit is according to output voltage
Reference signal progressively carries out lifting to from the amplitude of inversion unit output voltage, sends over main inversion unit from inversion unit
Voltage effective value reference signal obtain after combine by the way of voltage effective value feedovers real-time voltage virtual value feedback
Correction link obtains instructing from the output voltage amplitude of inversion unit, then presents resistive spy according to from inversion unit output impedance
Point, is respectively adopted active power and reactive power and its output voltage amplitude and frequency is carried out droop control.
To sum up, technique scheme by one main inversion unit send main inversion unit output voltage frequency signal and
Amplitude signal, to from inversion unit, is made from inversion list by droop control according to frequency signal and amplitude signal from inversion unit
Output voltage and the frequency of the output voltage of main inversion unit of unit, amplitude are identical, and technique scheme is capable of multiple stage and stores up
Can realize and the function of machine soft start during inverter off-network (i.e. island mode) output, reduce in micro-capacitance sensor, moment throw with
The nonlinear load impacts to inverter such as uncontrollable rectifier type, capacitive, improve and the band of the reliability of machine and inverter carries energy
Power.
By explanation and accompanying drawing, give the exemplary embodiments of the ad hoc structure of detailed description of the invention, based on present invention essence
God, also can make other conversion.Although foregoing invention proposes existing preferred embodiment, but, these contents are not intended as
Limitation.
For a person skilled in the art, after reading described above, various changes and modifications will be apparent to undoubtedly.
Therefore, appending claims should regard whole variations and modifications of true intention and the scope containing the present invention as.In power
The scope of any and all equivalence and content in the range of profit claim, be all considered as still belonging to the intent and scope of the invention.
Claims (10)
1. the soft start of energy storage inverter in parallel runs a system, is applied under the island mode of micro-capacitance sensor, and described operation is
System include a main inversion unit and be connected with described main inversion unit at least one from inversion unit, it is characterised in that institute
State main inversion unit to include:
Soft-start module, in order to terminate order to described from inversion unit transmission soft start initiation command and soft start；
Frequency module, the most described in order to the frequency signal and phase signal obtaining and exporting the output voltage of described main inversion unit
From inversion unit；
Amplitude module, in order to obtain and to export the reference signal of the output voltage virtual value of described main inversion unit to described from inverse
Become unit；
Described main inversion unit when soft start according to described main inversion unit output active power and reactive power, according under
The output voltage of main inversion unit described in algorithm controls of hanging down；
Described include from inversion unit:
Droop control module, is connected, in order at soft start with described soft-start module, frequency cells, described amplitude unit respectively
Time use the sagging algorithm controls output voltage amplitude from inversion unit and frequency according to its active power of output and reactive power.
The soft start of energy storage inverter in parallel the most according to claim 1 runs system, it is characterised in that described frequency mould
Block includes:
Pulse unit, in order to obtain the pulse signal of the output voltage of described main inversion unit, and according to described pulse signal
Obtain the phase signal of described frequency signal and output voltage；
Transmitting element, is connected with described pulse unit, in order to export described frequency signal to described from inversion unit.
The soft start of energy storage inverter in parallel the most according to claim 1 runs system, it is characterised in that described amplitude mould
Block includes:
Coding unit, in order to output after described reference signal being encoded to described from inversion unit.
The soft start of energy storage inverter in parallel the most according to claim 3 runs system, it is characterised in that described from inversion
Unit also includes:
Decoder module, is connected with described coding unit, described droop control module respectively, in order to the described reference signal to coding
Decoding, reduces described reference signal.
The soft start of energy storage inverter in parallel the most according to claim 1 runs system, it is characterised in that described from inversion
Unit also includes:
Input module, is connected with described frequency module respectively, in order to input described frequency signal.
The soft start of energy storage inverter in parallel the most according to claim 1 runs system, it is characterised in that described sagging control
Molding block includes:
Meritorious unit, in order to be adjusted the described output voltage amplitude from inversion unit；
Idle unit, in order to be adjusted the described output voltage frequency from inversion unit.
The soft start of energy storage inverter in parallel the most according to claim 1 runs system, it is characterised in that described sagging control
Molding block also includes:
Feed forward element, in order to carry out feed-forward regulation to the reference signal of the output voltage virtual value of described main inversion unit；
Feedback unit, in order to carry out feedback regulation to the virtual value of the described output voltage from inversion unit.
8. a soft start operation method for energy storage inverter in parallel, is applied in micro-grid energy storage system, it is characterised in that bag
Include:
Step S1, after the main power source power-off of micro-capacitance sensor, accessory power supply starts main inversion unit by a soft-start module；
Step S2, described main inverter unit carries out droop control according to active power and the reactive power of output, and described
Voltage effective value reference signal, output voltage phase signal and the output frequency phase signal of the output of main inverter unit synchronize to send out
Give from inversion unit；
Step S3, obtains and exports the frequency plot signal of the output voltage of described main inversion unit and described main inversion unit
The reference signal of output voltage virtual value；
Step S4, described from inversion unit according to the frequency plot signal of described main inversion unit and reference signal according to described from
Active power and the reactive power of the output of inversion list are carried out described in droop control from frequency and the width of the output voltage of inversion unit
Value.
The soft start operation method of energy storage inverter in parallel the most according to claim 8, it is characterised in that described step S3
Specifically include:
Step S31, obtains the zero crossing pulse signal of the output voltage of described main inversion unit, and according to described pulse signal
Obtain described frequency signal；
Step S32, output voltage virtual value reference signal is encoded by described main inversion unit；
Step S33, described main inversion unit exports described frequency plot signal and output voltage virtual value coding signal to described
From inversion unit.
The soft start operation method of energy storage inverter in parallel the most according to claim 9, it is characterised in that described step
S4 specifically includes:
Step S41, described from inversion unit by coding described main inversion unit output voltage virtual value reference signal decoding,
It is reduced to described from the output voltage virtual value reference signal of inversion unit；
Step S42, described joins according to the output voltage virtual value of described frequency signal and described main inversion unit from inversion unit
Examine described in Signal Regulation from frequency, the phase and amplitude of the output voltage of inversion unit.
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