CN106452122A - Parallel coordinative running control method and control device of AC/DC direct current source - Google Patents
Parallel coordinative running control method and control device of AC/DC direct current source Download PDFInfo
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- CN106452122A CN106452122A CN201610841116.7A CN201610841116A CN106452122A CN 106452122 A CN106452122 A CN 106452122A CN 201610841116 A CN201610841116 A CN 201610841116A CN 106452122 A CN106452122 A CN 106452122A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/17—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in parallel
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Inverter Devices (AREA)
Abstract
The invention relates to a parallel coordinative running control method and control device of an AC/DC direct current source. The method comprises the steps of calculating a correction current of each AC/DC converter; calculating a current instruction value of each AC/DC converter; and calculating a sum value of the correction current of each AC/DC converter and the current instruction value of each AC/DC converter, calculating a difference value of the sum value and a direct current of a corresponding AC/DC converter, controlling the corresponding AC/DC converter according to an output current given value of each AC/DC converter so as to achieve parallel coordinative running control, wherein the difference value is the output current given value of the corresponding AC/DC converter. By the method, a circular current is avoided, reliable running of the direct current source is satisfied, and the output of each AC/DC converter can reach optimal conversion efficiency.
Description
Technical field
The present invention relates to AC/DC DC source parallel connection coordinated operation control method and control device, belong to DC source and all flow control
Technical field processed.
Background technology
With the lifting of power electronic equipment single-machine capacity grade, using power electronic equipment the machine number of parallel-connection structure
More and more, as shown in figure 1, being the existing DC source being made up of multiple AC/DC inverter parallel connections, these AC/DC inverters
DC side be all connected with dc bus.The capacity of this DC source has obtained greatly being lifted, and increase effectively output, but
It is also to have emerged very big problem.
Because the output impedance of multiple AC/DC inverters is different different with floating voltage, may result in and be total to direct current at the same time
Bus carries out result in uneven stream during DC voltage control, however, also having more harsh conditions it is simply that circulation.By PWM rectification
Droop characteristic can be seen that occur circulation precondition be exactly inverter floating voltage different.Meeting the multiple stage change of current
Under the floating voltage different condition of device, when the floating voltage difference of multiple stage inverter is bigger, probability circulation is bigger, and ring
Stream is bigger；When the floating voltage of multiple stage inverter is different, when the output impedance of multiple stage inverter is less, probability circulation is got over
Greatly, and circulation is bigger.Often table apparatus inner resistance is inconsistent leads to system to make with as DC source in the case of common DC bus
With it may appear that power ring flow phenomenon.
In order to effectively eliminate uneven stream and change of current phenomenon, publication No. is that the Chinese patent application of CN 105048502A is open
A kind of control method of parallel power generating system, when carrying out sharing control, calculates the correcting current of modules, then with electricity
Pressure actuator output valve is added as output current set-point, is then all flowed according to the output current set-point of modules
Control.Wherein, the voltage regulator output valve of each module is all to be made the difference with output voltage according to output voltage reference value to obtain, by
Be definite value in output voltage reference value, then the corresponding voltage regulator output valve of each module all with respective output voltage phase
Close, the differential magnitude due to each output voltage may be larger, also corresponding between the voltage regulator output valve of each module obtaining
There is very big difference, therefore, this control method control is dumb, and reliability is relatively low.
Content of the invention
It is an object of the invention to provide a kind of AC/DC DC source parallel connection coordinated operation control method, existing in order to solve
The relatively low problem of current-sharing control method control reliability.Present invention simultaneously provides a kind of AC/DC DC source parallel connection coordinated operation control
Device processed.
For achieving the above object, the solution of the present invention includes a kind of AC/DC DC source parallel connection coordinated operation control method, bag
Include：
The step calculating the correcting current of each AC/DC inverter, specially：Direct current according to all of AC/DC inverter
Current calculation average current, described average current and the DC current of each AC/DC inverter is made the difference and corresponding obtain each AC/DC and change
The correcting current of stream device；
The step calculating the current instruction value of each AC/DC inverter, specially：It is set with least two voltage ranges, root
According to the corresponding current instruction value calculating each AC/DC inverter of the voltage range residing for the DC voltage of each AC/DC inverter；
The step that coordinated operation in parallel controls, specially：Calculate correcting current and corresponding A C/DC of each AC/DC inverter
The value preset of the current instruction value of inverter, and calculate the difference of this value preset and the DC current of corresponding A C/DC inverter, this difference
It is the output current set-point of corresponding A C/DC inverter, the output current set-point according to each AC/DC inverter is to corresponding
AC/DC inverter is controlled, and realizes coordinated operation in parallel and controls.
In the step of current instruction value of each AC/DC inverter of described calculating, different voltage ranges corresponds to power output
The different calculation of reference value, the voltage range residing for the DC voltage according to each AC/DC inverter is corresponding to calculate each AC/DC
The power output reference value of inverter, then calculates according to the DC voltage of power output reference value and each AC/DC inverter
The current instruction value of described each AC/DC inverter.
Described voltage range is set to three, respectively：
UH1≤Udc＜ UH2、UL1≤Udc＜ UH1And UL2≤Udc＜ UL1；
Calculate the power output reference value of each AC/DC inverter according to below equation：
Calculate the current instruction value of each AC/DC inverter according to below equation：
Wherein, Udc(i)For the DC voltage of i-th AC/DC inverter, UH1And UL1It is respectively the AC/DC inverter setting
Control threshold voltage；UH2And UL2It is respectively higher limit and the lower limit of DC bus-bar voltage steady change scope, UH2＞ UH1＞
UL1＞ UL2, P is the rated power of AC/DC inverter, Pref(i)For the power output reference value of i-th AC/DC inverter,
Idcref(i)For the current instruction value of i-th AC/DC inverter, i=1,2 ..., n.
A kind of AC/DC DC source parallel connection coordinated operation control device, including：
For calculating the module of the correcting current of each AC/DC inverter, specially：According to all of AC/DC inverter
DC current calculates average current, described average current and the DC current of each AC/DC inverter is made the difference and corresponding obtains each AC/
The correcting current of DC inverter；
For calculating the module of the current instruction value of each AC/DC inverter, specially：It is set with least two voltage models
Enclose, the corresponding current-order calculating each AC/DC inverter of the voltage range residing for the DC voltage according to each AC/DC inverter
Value；
The module controlling for coordinated operation in parallel, specially：Calculate the correcting current of each AC/DC inverter with corresponding
The value preset of the current instruction value of AC/DC inverter, and calculate the difference of this value preset and the DC current of corresponding A C/DC inverter,
This difference is the output current set-point of corresponding A C/DC inverter, according to the output current set-point pair of each AC/DC inverter
Corresponding AC/DC inverter is controlled, and realizes coordinated operation in parallel and controls.
During the current instruction value calculating each AC/DC inverter, different voltage ranges corresponds to power output reference
It is worth different calculations, the voltage range residing for the DC voltage according to each AC/DC inverter is corresponding to calculate each AC/DC change of current
The power output reference value of device, then according to the DC voltage of power output reference value and each AC/DC inverter calculates
The current instruction value of each AC/DC inverter.
Described voltage range is set to three, respectively：
UH1≤Udc＜ UH2、UL1≤Udc＜ UH1And UL2≤Udc＜ UL1；
Calculate the power output reference value of each AC/DC inverter according to below equation：
Calculate the current instruction value of each AC/DC inverter according to below equation：
Wherein, Udc(i)For the DC voltage of i-th AC/DC inverter, UH1And UL1It is respectively the AC/DC inverter setting
Control threshold voltage；UH2And UL2It is respectively higher limit and the lower limit of DC bus-bar voltage steady change scope, UH2＞ UH1＞
UL1＞ UL2, P is the rated power of AC/DC inverter, Pref(i)For the power output reference value of i-th AC/DC inverter,
Idcref(i)For the current instruction value of i-th AC/DC inverter, i=1,2 ..., n.
First, the correcting current of each AC/DC inverter, and the current instruction value of each AC/DC inverter are calculated, then
Actual DC electric current further according to each AC/DC inverter to calculate the output current set-point of each AC/DC inverter, last root
Output current set-point according to each AC/DC inverter carries out coordinated operation control in parallel to corresponding AC/DC inverter, to reach
The effect of the current uniform of each AC/DC inverter.So, the control method for coordinating in parallel that the present invention provides is it can be avoided that occur
The situation of circulation, meets the reliability service of DC source, and the output of each AC/DC inverter can be made to reach the conversion effect of optimum
Rate.And, compared with the existing coordination control strategy being dominant using DC bus-bar voltage, it is to avoid each AC/DC change of current occurs
The inconsistent situation of device output occurs.
And, in the method that the present invention provides, it is set with least two voltage ranges, current instruction value is according to AC/DC
Voltage range residing for the DC voltage of inverter and accordingly calculated, DC voltage is in different voltage ranges and corresponds to
The acquisition modes of different direct current command value, so, voltage range according to residing for DC voltage for the method can obtain properly
Current instruction value, therefore, the present invention provide method when coordinating control using current instruction value compared to existing
Method, its reliability is greatly lifted.And, have much regardless of the differential magnitude between DC voltage, all being capable of basis
Obtaining suitable current instruction value, therefore, the method that the present invention provides controls more flexible, Er Qieshi to suitable calculation
For the occasion that DC voltage difference amplitude is larger.
The control principle of the control method for coordinating in parallel that the present invention provides is that two DC current rings control, for realizing direct current
Electric current sharing control scheme, is respectively adopted DC current outer shroud adjusting means own power, is realized in injustice using current inner loop
In the case of weighing apparatus, the current balance type output of system itself is not affected by electric network state.And, outer shroud adopts DC current ring to control
Ensure that the electric current distribution equilibrium of output quick response.So, the present invention is capable of the stable operation of system, and can
According to dc bus parallel connection device characteristics, adjust automatically control model realizes rush of current and power waves when system start-up and excision
Dynamic, finally realize output current equilibrium.
Brief description
Fig. 1 is the overall structure diagram of the DC source being made up of multiple AC/DC inverter parallel connections；
Fig. 2 is droop characteristic figure；
Fig. 3 is the overall structure diagram of the DC source being made up of two AC/DC inverter parallel connections；
Fig. 4 is the control principle drawing of coordinated operation control method in parallel.
Specific embodiment
Embodiment of the method
The AC/DC DC source parallel connection coordinated operation control method that the present invention provides is applied to DC source system as shown in Figure 1
System, wherein, n >=2, no matter what the concrete numerical value of n is, it is arranged in parallel how many AC/DC inverter in this DC source, all
The DC source parallel connection coordinated operation control method that can be provided using the present invention is carried out coordination in parallel and controls.
In the present embodiment, the AC/DC inverter in AC/DC DC source is bi-directional inverter, as shown in figure 1, being capable of basis
DC load and DC side power supply DC/DC energy are automatically obtained alternating current-direct current power match, when direct current DC/DC power supply provides energy big
When DC load, AC/DC inverter can be input to AC network from direct current energy absorption, and now inverter is operated in inversion
State；Conversely, being injected into direct current network from exchange energy absorption, now inverter is operated in rectification state.
The AC/DC DC source parallel connection coordinated operation control method that the present invention provides mainly includes the following steps that：
The step calculating the correcting current of each inverter, specially：Gathered each using existing current sensing means
The DC current of individual Converter DC-side, calculates meansigma methodss I of all of DC currentav, then calculate this meansigma methods IavWith each
The difference of the DC current of individual inverter, this difference is each inverter corresponding correcting current value.
The step calculating the current instruction value of each inverter, specially：Detect the unidirectional current of each Converter DC-side
Pressure, can carry out voltage detecting using existing voltage check device.It is provided with least two voltage ranges, each AC/DC change of current
At the DC voltage of device, different voltage ranges just corresponds to the calculation of different current instruction values, then, according to each
Voltage range residing for the DC voltage of AC/DC inverter just can calculate the current instruction value of each AC/DC inverter.Due to
Electric current has corresponding relation with power and voltage, then in the present embodiment, calculated using the relation between power and voltage
Electric current, specially：The voltage range residing for DC voltage first according to each AC/DC inverter, and according to voltage range and work(
The power output reference value to calculate each AC/DC inverter for the corresponding relation between rate output reference value, then according to each AC/DC
The power output reference value of inverter to calculate the electric current of each AC/DC inverter with the DC voltage of corresponding AC/DC inverter
Command value.The present embodiment provides a kind of specific calculation, as described below：
For avoiding the unnecessary action of power electronic devices in AC/DC inverter, reduce power electronic devices work and cause
Harmonic wave, the droop control characteristic of AC/DC inverter is using as shown in Figure 2.
Wherein, UH1And UL1For the control threshold voltage of AC/DC inverter, it is setting value；UH2And UL2For DC bus-bar voltage
The higher limit of steady change scope and lower limit, the maximum that is, DC bus-bar voltage can reach when changing up and down and
Little value, is given value.The present embodiment provides a kind of physical relationship between above-mentioned several parameter：UH2-UH1=15V, UL1-UL2=
15V、UH1-UL1=30V, certainly, the invention is not limited in this physical relationship.
Because this AC/DC inverter is two-way AC/DC inverter, so, its mode of operation is divided into 3 kinds：
1) inverter mode：The power of DC load is less than rated power, and DC source runs on underloading condition, dc bus electricity
Pressure rises and more than UH1；AC/DC inverter is opened and is worked in inverter mode, and dump power in dc bus is delivered to exchange
Electrical network；When DC bus-bar voltage recovers to UH1When, AC/DC inverter quits work.
2) standby mode：DC bus-bar voltage small range fluctuation near rated value, does not carry out the biography of alternating current-direct current side power
Defeated.
3) rectification mode：DC load power be higher than rated power, DC source heavy service, DC bus-bar voltage decline and
Less than UL1；Rectification mode is opened and worked in AC/DC inverter, and direct current network internal deficiency electricity is supplied by AC network；Directly
Stream busbar voltage is recovered to UL1When, AC/DC inverter quits work.
Therefore, in the present embodiment, voltage range has three, respectively：
UH1≤Udc＜ UH2、UL1≤Udc＜ UH1And UL2≤Udc＜ UL1.
Corresponding active output reference quantity P of each AC/DC inverter can be obtained according to above-mentioned droop characteristicref, computing formula
As follows：
Wherein, P is the rated power of AC/DC inverter, PrefFor the power output reference value of AC/DC inverter, different
AC/DC inverter is to should have different power output reference values, therefore, Pref(i)The power representing i-th AC/DC inverter is defeated
Go out reference value, Udc(i)For the DC voltage of i-th AC/DC inverter, i=1,2 ..., n.
Then calculate the current instruction value of each AC/DC inverter according to power output reference value, computing formula is as follows：
Wherein, Idcref(i)Current instruction value for i-th AC/DC inverter.
Above-mentioned be relation according to power and voltage come calculating current command value, it is, of course, also possible to using other modes
Calculating current command value.No matter using which kind of mode calculating current command value, being all the DC voltage according to each AC/DC inverter
Corresponding relation between residing voltage range and current instruction value is calculating the current instruction value of each AC/DC inverter.
Coordinated operation control method in parallel also includes the step that coordinated operation in parallel controls.According to each AC/DC inverter
The DC current values of correcting current value, current instruction value and reality carrying out coordinated operation control in parallel, due to all of AC/
The control strategy all same of DC inverter, below taking one of as a example, specific as follows：
Calculate the value preset of the correcting current of this AC/DC inverter and the current instruction value of this AC/DC inverter, the sum obtaining
Value is made the difference with the DC current of the reality of this AC/DC inverter, the difference obtaining be the output current of this AC/DC inverter to
Definite value, is then processed to this output current set-point to generate corresponding pwm pulse ripple that this AC/DC inverter is carried out
Control, because this partly belongs to routine techniquess, just no longer illustrate here.Other AC/DC inverters are also carried out so
Control, realize the coordinated operation in parallel of this DC source is controlled.
When being processed output current set-point to generate corresponding pwm pulse ripple, three-phase current can be by just
Negative phase-sequence separates, and obtains positive sequence and negative sequence component (because device adopts three-phase system, output does not have current zero sequence component), tool
Body is as follows：
The positive and negative order components of electric current will be separated and carry out park rotation transformation, obtain dq component, and so utilize PI to control real
The zero steady state error control of existing DC quantity is it is ensured that electric current fast and stable, specific as follows：
Above-mentioned positive-negative sequence separates and rotation transformation belongs to routine techniquess, and the emphasis of the present invention does not lie in this yet,
Therefore no longer describe in detail here.
Illustrate below taking representative n=2 as a example.As shown in figure 3, including AC/DC inverter 1 and AC/DC
Inverter 2.
As shown in figure 4, the DC source parallel connection coordinated operation control principle in figure that the present invention provides includes flow equalizing ring and electric current
Instruction ring.Flow equalizing ring is used for calculating the correcting current of each inverter, and current-order ring is used for calculating the current-order of each inverter
Value.
Gather the DC current I of this two invertersdc1And Idc2, and then try to achieve average current Iav, then, average current
IavDC current I with inverter 1dc1Make the difference the correcting current Δ I obtaining inverter 1dc1, average current IavWith inverter 2
DC current Idc2Make the difference the correcting current Δ I obtaining inverter 2dc2.
The electric current that DC voltage according to this two inverters and above-mentioned computing formula are calculated inverter 1 respectively refers to
Make value Idcref(1), and the current instruction value I of inverter 2dcref(2).
So, the output current set-point I of inverter 1Output 1=Δ Idc1+Idcref(1)-Idc1；The output current of inverter 2
Set-point IOutput 2=Δ Idc2+Idcref(2)-Idc2.
Finally, according to the output current set-point I obtainingOutput 1And IOutput 2Corresponding inverter is controlled, realizes in parallel
Coordinated operation controls.
In addition, for the DC source of Fig. 3, the present embodiment additionally provides and this DC source is carried out start the control plan controlling
Slightly, specific as follows：Two inverter DC parallels are coordinated control and are accepted the startup order that monitoring system issues, inverter 1 simultaneously
When receiving startup order, line voltage meets entry condition first to start to start, and DC voltage-stabilizing runs；Inverter 2 receives and opens
Dynamic order judges whether inverter 1 starts and completes by detecting inverter 1 electric current and port DC bus-bar voltage, judges inverter
After the completion of 1 starts, inverter 2 starts to start.
And, additionally provide and this DC source is carried out shut down with the control strategy controlling, specific as follows：DC source receives and stops
During machine order, start to execute electric current loop slow fall Power Control, when current reduction is to certain limit, inverter 2 is directly shut down, if
Inverter 1 receives halt command and takes mode identical with inverter 2, and in case of emergency, inverter 2 directly trips, then
Inverter 2 power output is directly taken over by inverter 1 output current, now inverter 1 output is uprushed it may appear that overshoot is existing
As.When inverter 1 runs into emergency shutdown situation, take phase homonymy rate with inverter 2, can be kept away using this kind of shutdown scheme as far as possible
When exempting to start, power swing causes electric current to shake.
In above-described embodiment, give a kind of voltage range residing for DC voltage of each AC/DC inverter and corresponding A C/
Physical relationship between the current instruction value of DC inverter, this is a kind of specific embodiment, the invention is not limited in
Above-mentioned embodiment.
Device embodiment
The present invention also provides a kind of AC/DC DC source parallel connection coordinated operation control device, including such as lower module：For calculating
The module of the correcting current of each AC/DC inverter；For calculating the module of the current instruction value of each AC/DC inverter；For simultaneously
The module that connection coordinated operation controls.
Above three module is software module, and concrete effect is all relative with three steps in said method embodiment
Should, detailed description is made that to these three steps due in said method embodiment, just no longer specifically describes here.
It is presented above specific embodiment, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter do not need to spend creative work.Right without departing from the principles and spirit of the present invention
Change, modification, replacement and modification that embodiment is carried out still fall within protection scope of the present invention.
Claims (6)
1. a kind of AC/DC DC source parallel connection coordinated operation control method is it is characterised in that include：
The step calculating the correcting current of each AC/DC inverter, specially：DC current according to all of AC/DC inverter
Calculate average current, described average current and the DC current of each AC/DC inverter are made the difference and corresponding obtains each AC/DC inverter
Correcting current；
The step calculating the current instruction value of each AC/DC inverter, specially：It is set with least two voltage ranges, according to each
The corresponding current instruction value calculating each AC/DC inverter of voltage range residing for the DC voltage of AC/DC inverter；
The step that coordinated operation in parallel controls, specially：Calculate correcting current and the change of current of corresponding A C/DC of each AC/DC inverter
The value preset of the current instruction value of device, and calculate the difference of this value preset and the DC current of corresponding A C/DC inverter, this difference is
The output current set-point of corresponding A C/DC inverter, the output current set-point according to each AC/DC inverter is to corresponding AC/
DC inverter is controlled, and realizes coordinated operation in parallel and controls.
2. AC/DC DC source according to claim 1 parallel connection coordinated operation control method it is characterised in that
In the step of current instruction value of each AC/DC inverter of described calculating, different voltage ranges corresponds to power output reference
It is worth different calculations, the voltage range residing for the DC voltage according to each AC/DC inverter is corresponding to calculate each AC/DC change of current
The power output reference value of device, then according to the DC voltage of power output reference value and each AC/DC inverter calculates
The current instruction value of each AC/DC inverter.
3. AC/DC DC source according to claim 2 parallel connection coordinated operation control method it is characterised in that
Described voltage range is set to three, respectively：
UH1≤Udc＜ UH2、UL1≤Udc＜ UH1And UL2≤Udc＜ UL1；
Calculate the power output reference value of each AC/DC inverter according to below equation：
Calculate the current instruction value of each AC/DC inverter according to below equation：
Wherein, Udc(i)For the DC voltage of i-th AC/DC inverter, UH1And UL1It is respectively the control of the AC/DC inverter setting
Threshold voltage processed；UH2And UL2It is respectively higher limit and the lower limit of DC bus-bar voltage steady change scope, UH2＞ UH1＞ UL1
＞ UL2, P is the rated power of AC/DC inverter, Pref(i)For the power output reference value of i-th AC/DC inverter, Idcref(i)
For the current instruction value of i-th AC/DC inverter, i=1,2 ..., n.
4. a kind of AC/DC DC source parallel connection coordinated operation control device is it is characterised in that include：
For calculating the module of the correcting current of each AC/DC inverter, specially：Direct current according to all of AC/DC inverter
Current calculation average current, described average current and the DC current of each AC/DC inverter is made the difference and corresponding obtain each AC/DC and change
The correcting current of stream device；
For calculating the module of the current instruction value of each AC/DC inverter, specially：It is set with least two voltage ranges, root
According to the corresponding current instruction value calculating each AC/DC inverter of the voltage range residing for the DC voltage of each AC/DC inverter；
The module controlling for coordinated operation in parallel, specially：Calculate correcting current and corresponding A C/DC of each AC/DC inverter
The value preset of the current instruction value of inverter, and calculate the difference of this value preset and the DC current of corresponding A C/DC inverter, this difference
It is the output current set-point of corresponding A C/DC inverter, the output current set-point according to each AC/DC inverter is to corresponding
AC/DC inverter is controlled, and realizes coordinated operation in parallel and controls.
5. AC/DC DC source according to claim 4 parallel connection coordinated operation control device it is characterised in that
During the current instruction value calculating each AC/DC inverter, the corresponding power output reference value of different voltage ranges is not
Same calculation, each AC/DC inverter of corresponding calculating of the voltage range residing for the DC voltage according to each AC/DC inverter
Power output reference value, then calculates described each AC/ according to the DC voltage of power output reference value and each AC/DC inverter
The current instruction value of DC inverter.
6. AC/DC DC source according to claim 5 parallel connection coordinated operation control device it is characterised in that
Described voltage range is set to three, respectively：
UH1≤Udc＜ UH2、UL1≤Udc＜ UH1And UL2≤Udc＜ UL1；
Calculate the power output reference value of each AC/DC inverter according to below equation：
Calculate the current instruction value of each AC/DC inverter according to below equation：
Wherein, Udc(i)For the DC voltage of i-th AC/DC inverter, UH1And UL1It is respectively the control of the AC/DC inverter setting
Threshold voltage processed；UH2And UL2It is respectively higher limit and the lower limit of DC bus-bar voltage steady change scope, UH2＞ UH1＞ UL1
＞ UL2, P is the rated power of AC/DC inverter, Pref(i)For the power output reference value of i-th AC/DC inverter, Idcref(i)
For the current instruction value of i-th AC/DC inverter, i=1,2 ..., n.
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| CN201610841116.7A CN106452122A (en) | 2016-09-22 | 2016-09-22 | Parallel coordinative running control method and control device of AC/DC direct current source |
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| CN201610841116.7A Pending CN106452122A (en) | 2016-09-22 | 2016-09-22 | Parallel coordinative running control method and control device of AC/DC direct current source |
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