CN104953878B - A kind of off-network inverter parallel system and its high frequency carrier synchronous method - Google Patents
A kind of off-network inverter parallel system and its high frequency carrier synchronous method Download PDFInfo
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Abstract
The present invention provides a kind of off-network inverter parallel system, including main inverter, master controller, it is multiple from inverter and be correspondingly arranged from controller；The input of main inverter and multiple inputs from inverter are connected with a dc source Udc respectively；The output end of main inverter and it is connected to a LC filter circuit from the output end of inverter；The ac bus in parallel of output end formation one of each LC filter circuits is simultaneously connected with common load R；The ac voltage signal of main inverter is gathered by ac bus in parallel from controller, and calculate from the adjusted value of inverter internal reference voltage zero crossing, and adjusted according to adjusted value from the triangle carrier signal of inverter internal with from inverter internal reference voltage zero crossing and remain synchronous.The program has abandoned original RS485 buses or CAN interconnection line gathers the mode of synchronizing signal, not only reduces hardware cost, and improve shunt chopper unfailing performance.
Description
Technical field
The present invention relates to a kind of convertor equipment and its control method, more particularly to a kind of off-network inverter parallel system and its
High frequency carrier synchronous method.
Background technology
Inverter parallel can effectively expand power-supply system capacity, improve the reliability of system, be to realize power supply
The basis of modularization and distributed power supply system, in many occasions, such as large ship becomes distribution and land micro-grid system, obtains
Extensive use is arrived.
Need to ensure the synchronization of high frequency carrier phase in inverter parallel application, can so reduce between inverter
Circulation, so as to reduce loss, improves simultaneously engine efficiency and simultaneously machine stability.It is total using RS485 in usual inverter parallel system
Line mode or CAN mode realize the transmission of high frequency carrier phase synchronized signal, while needing capture-port capture to be sent out
The high frequency carrier phase signal sent, so that the high frequency carrier between realizing inverter is synchronous.This method not only increases inversion
The hardware cost of device parallel system and need there is interconnection line between inverter, so as to cause shunt chopper unfailing performance
Reducing, and be readily incorporated interference signal when external environment condition is more severe causes the timeliness of synchronizing signal.
The content of the invention
Present invention seek to address that it is high, reliable to there is the hardware cost that interconnection line brings between shunt chopper in the prior art
There is provided the off-network inverter parallel system that a kind of hardware cost is low, reliability is high for the low technical problem of property.
The present invention provides a kind of off-network inverter parallel system, including a main inverter, and it is interior provided with master controller, many
It is individual from inverter and its it is interior be respectively equipped with it is corresponding from controller；
The input of the main inverter and multiple inputs from inverter are connected with a dc source Udc respectively
Connect；
The output end of the main inverter is connected with a LC filter circuit, and the multiple output end from inverter is also divided
A corresponding LC filter circuit is not connected with；
The ac bus in parallel of output end formation one of each LC filter circuits is simultaneously connected with common load R；
The alternating current that triangle carrier signal inside the main controller controls adjustment main inverter is exported with main inverter
The zero crossing of pressure signal remains synchronous；
The ac voltage signal for gathering main inverter by ac bus in parallel from controller, and calculate from inverter
The adjusted value of internal reference voltage zero crossing, and according to adjusted value adjust from the triangle carrier signal of inverter internal with from inversion
Device internal reference voltage zero crossing remains synchronous.
Further, the main inverter and/or from the output voltage signal frequency of inverter be a fixed value, and with it is right
The ratio for answering triangle carrier signal frequency is also a fixed value.
Further, the main inverter and/or from the output voltage signal frequency of inverter be 50Hz.
The present invention also provides a kind of high frequency carrier synchronous method of above-mentioned off-network inverter parallel system, including,
Step S100, the three-phase alternating voltage signal of collection main inverter output, follows described three to intersect using phaselocked loop
Flow voltage signal and output is synchronous with the three-phase alternating voltage signal from inverter internal sine wave signal sin θ, cos θ；
Step S200, calculates described from inverter internal sine wave signal zero crossing moment reading value CLK and true zero passage
Time difference Δ t/Tclk between point count value CntZero；
Step S300, according to the time difference Δ t/Tclk, adjusts the PWM break periods, makes from inverter internal triangle
Carrier wave is synchronous with from inverter internal sine wave zero crossing.
Further, the step S100 is specifically included,
S110, three-phase alternating current the corrugating U0a, U0b, U0c of collection main inverter output；
S120, is converted by 3S/2S, and by the three-phase alternating current corrugating U0a, U0b, U0c is converted to two on α, β axle
Cross streams signal U0alfa, U0bata, and it is long to ask for the mould of vector voltage
S130, by U0alfa, U0bata is changed as unit sine wave signal U0sin, U0cos, wherein, U0sin=
U0bata/mod, U0cos=U0alfa/mod；
S140, constantly tracks U0sin, U0cos by locking phase control and obtains from inverter internal reference voltage sin θ, cos
θ。
Further, the step S200 is specifically included,
S210, calculates the phase difference θ for obtaining the internal sine ripple signal zero-acrross ing moment and true zero-acrross ing moment；
S220, according to corresponding to the cycle PrdNew of internal sine ripple signal filter value PrdFlt calculates Δ θ
Time difference
Further, in the step S220, when calculate the zero-acrross ing moment of the internal sine ripple signal next time with
During the phase difference θ of true zero-acrross ing moment, adjustment is calculated next time according to the cycle PrdNew of last sine wave signal
Filter value PrdFlt, computational methods such as following formula：
CntZero=CLK- Δs t/Tclk；
PrdNew=CntZero-CntZeroOld；
PrdFlt=0.7*PrdFlt+0.3*PrdNew；
CntZeroOld=CntZero；
Wherein, CntZeroOld is last time CntZero assignment.
Further, the step S300 is specifically included,
S310, the time difference Δ t/Tclk is converted in half of carrier cycle count value, count value (Δ t/ is obtained
Tclk) % (PrdFlt/ (2*PointNum)), wherein % is to take the remainder computing, PointNum be number interrupt cycle, i.e., one just
The number of string cycle Triangle ID carrier wave；
S320, by the count value (Δ t/Tclk) % (PrdFlt/ (2*PointNum)) write-in triangular carrier counters,
Adjust the triangular carrier synchronous with the internal sine ripple zero crossing.
Further, the main inverter and/or from the output voltage signal frequency of inverter be a fixed value, and with it is right
The ratio for answering triangle carrier signal frequency is also a fixed value.
Further, the main inverter and/or from the output voltage signal frequency of inverter be 50Hz.
Techniques described above scheme, gathers the three-phase alternating voltage that main inverter is exported, and count by ac bus in parallel
The adjusted value from inverter internal reference voltage zero crossing is calculated, and the triangular carrier letter from inverter internal is adjusted according to adjusted value
Number remain synchronous with from inverter internal reference voltage zero crossing, so that the high frequency carrier between realizing inverter is synchronous,
Abandon original RS485 buses or CAN interconnection line gather the mode of synchronizing signal, not only reduce hardware cost,
And improve shunt chopper unfailing performance.
Brief description of the drawings
Fig. 1 is the off-network inverter parallel system structure chart of an embodiment of the present invention；
Fig. 2 is the internal sine ripple zero crossing adjustment schematic diagram of an embodiment of the present invention；
Fig. 3 is the off-network inverter parallel system high frequency carrier synchronous method flow chart of an embodiment of the present invention；
Fig. 4 is the specific method flow chart of step S100 in Fig. 3；
Fig. 5 is the specific method flow chart of step S200 in Fig. 3；
Fig. 6 is the specific method flow chart of step S300 in Fig. 3.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with
Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
As shown in figure 1, Fig. 1 shows the off-network inverter parallel system of an embodiment of the present invention, including a master is inverse
Become device, it is interior provided with a master controller, the main controller controls send switch electricity of the drive signal to the main inverter
Road, so as to control the work of main inverter；
Also include it is multiple from inverter, it is described it is each from inverter internal be respectively equipped with one it is corresponding from controller, should
Drive signal can be transmitted to the corresponding on-off circuit from inverter from controller, so as to control the work from inverter.
The input of the main inverter and the multiple input from inverter respectively with a dc source Udc phase
Connection, dc source Udc provides direct current to the main inverter.
The output end of the main inverter is connected with a LC filter circuit, and the multiple output end from inverter is also divided
A corresponding LC filter circuit is not connected with, the output current signal of inverter is filtered respectively, filters off rectification output
Ripple in voltage.
The ac bus in parallel of output end formation one of each LC filter circuits is simultaneously connected with common load R, institute
State main inverter and powered respectively by ac bus in parallel to the common load R from inverter.
The alternating current that triangle carrier signal inside the main controller controls adjustment main inverter is exported with main inverter
The zero crossing of pressure signal remains synchronous；The alternating voltage for gathering main inverter by ac bus in parallel from controller
Signal, and the adjusted value from inverter internal reference voltage zero crossing is calculated, and adjusted according to adjusted value from inverter internal
Triangle carrier signal remains synchronous with from inverter internal reference voltage zero crossing.
In embodiment described above, by ac bus in parallel, the alternating voltage letter of main inverter is gathered from inverter
Number and keep synchronous with it by phaselocked loop, calculate from the adjusted value of inverter internal reference voltage zero crossing, and according to adjustment
Value adjusts from the triangle carrier signal of inverter internal with from inverter internal reference voltage zero crossing and remains synchronous.It is this
Frame mode has abandoned the interconnection lines such as RS485 buses or the CAN in original parallelly connected reverse converter system collection synchronizing signal
Mode, not only reduce hardware cost, and improve shunt chopper unfailing performance.
Further, in the off-network inverter parallel system that the present embodiment is provided, the main inverter and/or from inverter
Output voltage signal frequency be a fixed value, and be also a fixed value with the ratio of corresponding triangle carrier signal frequency.It is preferred that
Ground, the main inverter and/or from the output voltage signal frequency of inverter be 50Hz.
As shown in Fig. 2 embodiments of the invention also provide a kind of the same of above-mentioned off-network inverter parallel system high frequency carrier
One step process, including：
Step S100, the three-phase alternating voltage signal of collection main inverter output, follows described three to intersect using phaselocked loop
Flow voltage signal and output is synchronous with the three-phase alternating voltage signal from inverter internal sine wave signal sin θ, cos θ；
Step S200, calculates described from inverter internal sine wave signal zero crossing moment reading value CLK and true zero passage
Time difference Δ t/Tclk between point count value CntZero；
Step S300, according to the time difference Δ t/Tclk, adjusts the PWM break periods, makes from inverter internal triangle
Carrier wave is synchronous with from inverter internal sine wave zero crossing.
With reference to shown in Fig. 4, first, main inverter produces three-phase alternating current corrugating, and ensures the inside of main inverter
Triangular wave carrier is synchronous with alternating voltage zero-crossing point, and concrete implementation mode is：One is adjusted during each sine wave zero crossing
The phase of lower triangular wave, certain method of adjustment is identical with the zero crossing method of adjustment from inverter, will be discussed in more detail below.
The ac voltage signal of main inverter is gathered from inverter, internal sine is then made by the effect of internal phaselocked loop
The voltage waveform of ripple tracking main inverter realizes the phase-locked function.
Specifically, three-phase alternating current corrugating U0a, U0b, the U0c of main inverter output are gathered from inverter, is then passed through
3S/2S is converted, and is converted to two-phase AC signal U0alfa, the U0bata on α, β axle, the mould for then asking for vector voltage is longBy two-phase AC signal U0alfa, U0bata change into unit sine wave signal U0sin,
U0cos.U0sin=U0bata/mod, U0cos=U0alfa/mod, meanwhile, from reference voltage sin θ, the cos of inverter internal
θ constantly tracks U0sin, U0cos by locking phase control, so that from inverter internal sine wave and main inverter output voltage ripple
Shape is realized synchronous.
Therefore, the step S100 is specifically included：
S110, three-phase alternating current the corrugating U0a, U0b, U0c of collection main inverter output；
S120, is converted by 3S/2S, and by the three-phase alternating current corrugating U0a, U0b, U0c is converted to two on α, β axle
Cross streams signal U0alfa, U0bata, and it is long to ask for the mould of vector voltage
S130, by U0alfa, U0bata is changed as unit sine wave signal U0sin, U0cos, wherein, U0sin=
U0bata/mod, U0cos=U0alfa/mod；
S140, constantly tracks U0sin, U0cos by locking phase control and obtains from inverter internal reference voltage sin θ, cos
θ。
With reference to shown in Fig. 2, Fig. 5, after the completion of lock phase, internal angle, θ is exactly main inverter three-phase alternating current output voltage
The reference vector angle of signal, in PWM interruptions, when meeting sin θ ＞ 0, during sin' θ≤0, it is possible to judge reference vector
Zero crossing, sin θ ' be sin θ the corresponding sampling point value of previous switch periods, by zero passage flag set during zero crossing, under
By zero passage flag clear during individual switch periods, nought state was in show.Simultaneously with a variable in PWM interruptions
The number of PointNum constantly one sinusoidal cycles Triangle ID carrier wave of accumulation, resets variable PointNum during every zero crossing.
Further, the step S200 specifically includes following steps：
S210, calculates the phase difference θ for obtaining the internal sine ripple signal zero-acrross ing moment and true zero-acrross ing moment；
When judging zero crossing in being interrupted in PWM, real zero crossing has been have passed through in fact, judges the zero crossing moment
Internal reference vector angle has had the increment Delta θ of individual very little, and the Δ θ corresponding times are Δ t, and PrdFlt is represented and is mapped to the time
The filtered values of sine wave period PrdNew on counter, it is right that zero crossing moment reading CLK time counter values subtract Δ t institutes
The count value answered is exactly the value that real zero-crossing point is mapped on CLK time counters, and the count value corresponding to Δ t is equal to Δ t/
Tclk, Tclk are clock CLK counted clock cycles.Therefore the internal sine ripple signal zero-acrross ing moment and true zero passage are obtained
Enter step S220 after the phase difference θ at moment；
S220, according to corresponding to the cycle PrdNew of internal sine ripple signal filter value PrdFlt calculates Δ θ
Time difference
In above-mentioned steps S220, when calculating the zero-acrross ing moment of the internal sine ripple signal next time with true zero passage
During the phase difference θ at quarter, the filter value of adjustment next time is calculated according to the cycle PrdNew of last sine wave signal
PrdFlt；The count value CntZero=CLK- Δs t/Tclk, CntZero of real zero-crossing point is used as a upper true mistake again simultaneously
Zero point moment corresponding count value CntZeroOld, CntZero-CntZeroOld differences are exactly the sine week of internal sine ripple signal
Phase Tsine is mapped to the periodic quantity PrdNew on time counter CLK.
Therefore, by following formula, adjustment can be calculated according to the cycle PrdNew of last sine wave signal next
Secondary filter value PrdFlt：
CntZero=CLK- Δs t/Tclk； (2)
PrdNew=CntZero-CntZeroOld； (3)
PrdFlt=0.7*PrdFlt+0.3*PrdNew； (4)
CntZeroOld=CntZero； (5)
Wherein, CntZeroOld is last time CntZero assignment.
Current time difference Δ t/Tclk can be calculated by above-mentioned (1)-(5) formula.
With reference to shown in Fig. 6, this time difference Δ t/Tclk can't as current carrier counter adjustment amount, it is necessary to
By being converted in half of carrier cycle count value, therefore, the step S300 is specifically included：
S310, the time difference Δ t/Tclk is converted in half of carrier cycle count value, count value (Δ t/ is obtained
Tclk) % (PrdFlt/ (2*PointNum)), wherein % is to take the remainder computing, PointNum be number interrupt cycle, i.e., one just
The number of the triangular carrier counted in the string cycle；
S320, by the count value (Δ t/Tclk) % (PrdFlt/ (2*PointNum)) write-in triangular carrier counters,
Adjust the triangular carrier synchronous with the internal sine ripple zero crossing.
Wherein, PointNum is number interrupt cycle, that is, previously described one variable of use accumulates a sinusoidal cycles
The number of Triangle ID carrier wave.Can be calculated after above-mentioned computing triangular carrier from sine wave zero crossing start counting up when should
The count value having, modification phase can just be reached by changing Counter Value by writing the values into triangular wave counter
Purpose, it is achieved thereby that the triangular carrier purpose synchronous with sine wave zero crossing.
In practice in order to avoid once adjusting excessive influence carrier wave ratio compared with can carry out adjustment amount after LPF
Adjustment, can so be realized synchronous by some cycles.
Above-described off-network inverter parallel system high frequency carrier synchronization adjustment method is tried out in off-network inverter carrier wave
Frequency is with the relation occasion that output sinusoidal frequency is integral multiple, the adjustment of this method when both frequencies are not integral multiple relations
Effect is not good；Preferably, the main inverter and/or from the output voltage signal frequency of inverter be a fixed value, and with it is right
The ratio for answering triangle carrier signal frequency is also a fixed value.
Further, the main inverter and/or from the output voltage signal frequency of inverter be 50Hz.
In the above-mentioned off-network inverter parallel system high frequency carrier synchronization adjustment method provided with embodiments of the invention
Biggest advantage is, without interconnection line between inverter, reliability to be improved while reducing hardware cost, can be prevented effectively from outer
Interference signal is introduced when portion's environment is more severe causes the timeliness problem of synchronizing signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of off-network inverter parallel system high frequency carrier synchronous method, it is characterised in that：The off-network inverter parallel system
System includes a main inverter, provided with master controller in it, it is multiple from inverter and its it is interior be respectively equipped with it is corresponding from controller；
The input of the main inverter and multiple inputs from inverter are connected with a dc source Udc respectively；
The output end of the main inverter is connected with a LC filter circuit, and the multiple output end from inverter also connects respectively
It is connected to a corresponding LC filter circuit；
The ac bus in parallel of output end formation one of each LC filter circuits is simultaneously connected with common load R；
Triangle carrier signal inside the main controller controls adjustment main inverter is believed with the alternating voltage that main inverter is exported
Number zero crossing remain synchronous；
The ac voltage signal for gathering main inverter by ac bus in parallel from controller, and calculate from inverter internal
The adjusted value of reference voltage zero crossing, and adjusted according to adjusted value from the triangle carrier signal of inverter internal and out of inverter
Portion's reference voltage zero crossing remains synchronous；
The high frequency carrier synchronous method includes,
Step S100, the three-phase alternating voltage signal of collection main inverter output, the three-phase alternating current is followed using phaselocked loop
Press signal and output is synchronous with the three-phase alternating voltage signal based on inverter internal sine wave signal sin θ, the cos θ, θ
The reference vector angle of inverter three-phase alternating current output voltage signal；
Step S200, calculates described from inverter internal sine wave signal zero crossing moment reading value CLK and real zero-crossing point meter
Time difference Δ t/Tclk between numerical value CntZero；
Step S300, according to the time difference Δ t/Tclk, adjusts the PWM break periods, makes from inverter internal triangular carrier
It is synchronous with from inverter internal sine wave zero crossing.
2. off-network inverter parallel system high frequency carrier synchronous method according to claim 1, it is characterised in that：The step
Rapid S100 is specifically included,
S110, three-phase alternating current the corrugating U0a, U0b, U0c of collection main inverter output；
S120, is converted by 3S/2S, by the three-phase alternating current corrugating U0a, U0b, and what U0c was converted on α, β axle two intersects
Signal U0alfa, U0bata are flowed, and it is long to ask for the mould of vector voltage
S130, by U0alfa, U0bata is changed as unit sine wave signal U0sin, U0cos, wherein, U0sin=U0bata/
Mod, U0cos=U0alfa/mod；
S140, constantly tracks U0sin, U0cos by locking phase control and obtains from inverter internal reference voltage sin θ, cos θ.
3. off-network inverter parallel system high frequency carrier synchronous method according to claim 1, it is characterised in that：The step
Rapid S200 is specifically included,
S210, calculates the phase difference θ for obtaining the internal sine ripple signal zero-acrross ing moment and true zero-acrross ing moment；
S220, the time according to corresponding to the cycle PrdNew of internal sine ripple signal filter value PrdFlt calculates Δ θ
Difference
4. off-network inverter parallel system high frequency carrier synchronous method according to claim 3, it is characterised in that：Described
In step S220, as the phase difference θ for calculating the zero-acrross ing moment of the internal sine ripple signal next time and true zero-acrross ing moment
When, the filter value PrdFlt of adjustment next time, computational methods are calculated according to the cycle PrdNew of last sine wave signal
Such as following formula：
CntZero=CLK- Δs t/Tclk；
PrdNew=CntZero-CntZeroOld；
PrdFlt=0.7*PrdFlt+0.3*PrdNew；
CntZeroOld=CntZero；
Wherein, CntZeroOld is last time CntZero assignment.
5. off-network inverter parallel system high frequency carrier synchronous method according to claim 1, it is characterised in that：The step
Rapid S300 is specifically included,
S310, the time difference Δ t/Tclk is converted in half of carrier cycle count value, count value (Δ t/ is obtained
Tclk) % (PrdFlt/ (2*PointNum)), wherein % is to take the remainder computing, PointNum be number interrupt cycle, i.e., one just
The number of string cycle Triangle ID carrier wave, PrdFlt is the cycle PrdNew of internal sine ripple signal filter value；
S320, by the count value (Δ t/Tclk) % (PrdFlt/ (2*PointNum)) write-in triangular carrier counters, adjustment
The triangular carrier is synchronous with the internal sine ripple zero crossing.
6. the off-network inverter parallel system high frequency carrier synchronous method according to claim 1 or 2 or 3 or 4 or 5, it is special
Levy and be：The main inverter and/or from the output voltage signal frequency of inverter be a fixed value, and with corresponding triangular carrier
The ratio of signal frequency is also a fixed value.
7. off-network inverter parallel system high frequency carrier synchronous method according to claim 6, it is characterised in that：The master
Inverter and/or from the output voltage signal frequency of inverter be 50Hz.
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| CN106849721A (en) * | 2017-02-21 | 2017-06-13 | 西安中车永电捷通电气有限公司 | The synchronous method and apparatus of shunt chopper carrier signal |
| CN106981883A (en) * | 2017-03-24 | 2017-07-25 | 易事特集团股份有限公司 | Carrier synchronization method and device that a kind of multi-inverter parallel generates electricity |
| JP6777008B2 (en) * | 2017-05-19 | 2020-10-28 | 株式会社デンソー | Drive device |
| EP3681007B1 (en) | 2017-09-28 | 2022-08-10 | Huawei Technologies Co., Ltd. | Pwm control signal synchronization method for inverter, inverter, and power grid system |
| CN108377002B (en) * | 2018-05-09 | 2019-12-17 | 北京交通大学 | Method for suppressing switching subharmonic of inverter parallel system and inverter parallel system |
| CN109004681B (en) * | 2018-09-05 | 2019-07-12 | 山东大学 | Based on phaselocked loop without communicating global modulated signal synchronisation control means and system |
| CN110034667A (en) * | 2019-04-18 | 2019-07-19 | 哈尔滨工业大学 | A kind of circuit topology for eliminating the double branch motor high-frequency noises of close coupling |
| CN111756266B (en) * | 2020-02-25 | 2024-01-30 | 天津大学 | Multi-inverter parallel common mode circulation suppression method based on decentralized control |
| CN114257074B (en) * | 2021-12-15 | 2024-03-08 | 中车长春轨道客车股份有限公司 | Inverter parallel switch circulation suppression algorithm based on carrier phase synchronization |
| CN115883049B (en) * | 2022-11-30 | 2023-07-18 | 深圳市云天数字能源有限公司 | Signal synchronization method and device |
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