CN107017662A - A kind of combining inverter high voltage crossing control method based on PI compensators - Google Patents
A kind of combining inverter high voltage crossing control method based on PI compensators Download PDFInfo
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- CN107017662A CN107017662A CN201710289384.7A CN201710289384A CN107017662A CN 107017662 A CN107017662 A CN 107017662A CN 201710289384 A CN201710289384 A CN 201710289384A CN 107017662 A CN107017662 A CN 107017662A
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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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Abstract
The invention discloses a kind of combining inverter high voltage crossing control method based on PI compensators, including：Busbar voltage PI controllers, reactive current PI controllers are set up, generatrix voltage compensation value V is calculated respectivelydc_ cmp, reactive-current compensation value Id_cmp；The busbar voltage reference value V under high voltage crossing state is calculated againdc_ ref, reactive current reference value Id_ref；By the busbar voltage reference value V of gaineddc_ ref, reactive current reference value IdBusbar voltage reference value, reactive current reference values of the _ ref respectively as traditional combining inverter double-closed-loop control, for combining inverter control.A kind of combining inverter high voltage crossing control method based on PI compensators of the present invention, can effectively suppress the adverse effect of power network overvoltage generation, combining inverter is smoothly completed high voltage crossing.
Description
Technical field
The invention belongs to power electronics control field, more particularly, to a kind of high electricity of combining inverter based on PI compensators
Press traversing control method.
Background technology
As new energy relates to the lifting of net performance requirement, the combining inverter for possessing high voltage crossing ability progressively turns into city
The main flow of field.Draft standard in the current country, it is desirable to which grid-connected new energy equipment possesses 1.3 times of overvoltage service abilities.
Power network overvoltage can cause combining inverter ovennodulation phenomenon, and serious ovennodulation can cause bus fluctuation, electric current to dash forward
Increase, trigger stoppage protection even inverter to burn.The existing many adoption status judgment mechanisms of high voltage crossing technology, according to power network electricity
The grade that rises sharply is pressed, comes open loop lifting busbar voltage or increase reactive current, it is impossible to realize the optimization of busbar voltage and reactive current
Configuration
The technical program is according to combining inverter exit potential and DC bus current reasonable computation busbar voltage and idle
Current offset values, suppress the adverse effect that ovennodulation is produced with minimum cost, combining inverter is passed through high voltage crossing.
The content of the invention
In view of this, the present invention is directed to propose a kind of combining inverter high voltage crossing controlling party based on PI compensators
Method, according to combining inverter exit potential and DC bus current reasonable computation busbar voltage and reactive-current compensation value, with most
Small cost suppresses the adverse effect that ovennodulation is produced, and combining inverter is passed through high voltage crossing.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of combining inverter high voltage crossing control method based on PI compensators, comprises the following steps：
S1, the maximum V for inverter outlet line voltage amplitude of samplingmax,L, bus voltage value Vdc, ovennodulation compensation rate B,
Calculate PI controller input values PI_in；
S2, enables reactive current PI controllers, busbar voltage PI controllers by hystersis controller, will be obtained in step S1
PI controller input values PI_in introduce reactive current PI controllers, busbar voltage PI controllers and calculate and obtain reactive current benefit
Repay value Id_ cmp, generatrix voltage compensation value Vdc_cmp；
S3, the offset I that reactive current PI controllers are exportedd_ cmp wears reactive current estimated value I with heightd_ evl sums,
Result is introduced to current limiter, current slope limiter successively, reactive current reference value I is obtainedd_ref；
The offset V that busbar voltage PI controllers are exporteddc_ cmp wears busbar voltage estimated value V with heightdc_ evl sums,
And result is introduced to voltage clipper and voltage slope limiter successively, obtain busbar voltage reference value Vdc_ref；
S4, by the reactive current reference value I obtained in step S3d_ ref, busbar voltage reference value Vdc_ ref respectively as
Busbar voltage reference value, the reactive current reference value of combining inverter double-closed-loop control, for combining inverter control.
Further, in the step S1, use calculation formula for：
PI_in=Vmax,L-(Vdc-B) (1)
In formula, Vmax,LFor the maximum of inverter outlet line voltage amplitude；VdcFor bus voltage value；B compensates for ovennodulation
Amount.
Further, in the step S2, hystersis controller enters to busbar voltage PI controllers, reactive current PI controllers
Exercise and and control can be reset, its control method is：
As grid line voltage amplitude maximum Umax,LWith stable state busbar voltage reference value Vdc_ std_ref difference is more than stagnant ring
During upper limit hys_up, busbar voltage PI controllers and reactive current PI controllers are enabled；
As grid line voltage amplitude maximum Umax,LWith stable state busbar voltage reference value Vdc_ std_ref difference is less than stagnant ring
During lower limit hys_dw, busbar voltage PI controllers and reactive current PI controllers are closed, and to the output valve of two PI controllers
Vdc_ cmp and Id_ cmp is reset.
Further, in the step S2, generatrix voltage compensation value V is calculated by busbar voltage PI controllersdc_ cmp's
Expression formula is
In formula, KpVFor busbar voltage PI controller proportionality coefficients；KiVFor busbar voltage PI controller integral coefficients；S is product
Divide operator.
Further, in the step S2, reactive-current compensation value I is calculated by reactive current PI controllersd_ cmp's
Expression formula is：
In formula, KpIFor reactive current PI controller proportionality coefficients；KiIFor reactive current PI controller integral coefficients, s is product
Divide operator.
A kind of combining inverter high voltage crossing control system based on PI compensators, including high voltage crossing control mould
Block, two close cycles vector control module, the high voltage crossing control module include hystersis controller, busbar voltage control module,
Reactive current control module, the busbar voltage control module, the output end of reactive current control module connection two close cycles vector
Control module；
The reactive current control module includes reactive current PI controllers, current limiter, current slope limiter, three
Person is sequentially connected；
The busbar voltage control module includes busbar voltage PI controllers, voltage clipper, voltage slope limiter, three
Person is sequentially connected；
Signal output part connection reactive current PI controllers, the busbar voltage PI controllers of the hystersis controller, are used for
Control is enabled and is reset to busbar voltage PI controllers and reactive current PI controllers.
Relative to prior art, a kind of combining inverter high voltage crossing control based on PI compensators of the present invention
Method has the advantage that：According to combining inverter exit potential and DC bus current reasonable computation busbar voltage and idle electricity
Offset is flowed, the adverse effect that ovennodulation is produced is suppressed with minimum cost, combining inverter is passed through high voltage crossing；When
When high voltage crossing median generatrix voltage and non-optimal reactive current set-point, methods described can be calibrated to optimal shape automatically
State.
Brief description of the drawings
Fig. 1 is the control schematic diagram described in the embodiment of the present invention；
Fig. 2 is the high voltage crossing control effect figure described in the embodiment of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 is a kind of combining inverter high voltage crossing control system architecture schematic diagram based on PI compensators, including height
Voltage ride-through control module, two close cycles vector control module, the high voltage crossing control module include hystersis controller, bus
Voltage control module, reactive current control module, the busbar voltage control module, the output end of reactive current control module connect
Connect two close cycles vector control module；
The reactive current control module includes reactive current PI controllers, current limiter, current slope limiter, three
Person is sequentially connected；
The busbar voltage control module includes busbar voltage PI controllers, voltage clipper, voltage slope limiter, three
Person is sequentially connected；
Signal output part connection reactive current PI controllers, the busbar voltage PI controllers of the hystersis controller, are used for
Control is enabled and is reset to busbar voltage PI controllers and reactive current PI controllers.
A kind of combining inverter high voltage crossing control method based on PI compensators, detailed process is as follows：
1st, busbar voltage, reactive current PI controllers are set up, generatrix voltage compensation value and reactive-current compensation are calculated respectively
Value.
(1) the PI controller input value PI_in of busbar voltage and reactive current are calculated, computational methods are：
PI_in=Vmax,L-(Vdc-B) (1)
In formula, Vmax,LFor the maximum of inverter outlet line voltage amplitude；VdcFor bus voltage value；B compensates for ovennodulation
Amount, it is to make V during height wears stable state that it, which is acted on,max,LSlightly above Vdc, can typically set B=5.
(2) reactive current PI controllers are set up, and according to PI controller input value PI_in, calculate reactive-current compensation value
Id_ cmp, its expression formula is：
In formula, KpIFor reactive current PI controller proportionality coefficients；KiIFor reactive current PI controller integral coefficients, s is product
Divide operator
For KpIAnd KiI, can be adjusted according to electric current loop mathematical modeling.Because current inner loop can be approximately one order inertia
Link, and the general response time is about 0.001s, therefore its transmission function can be approximately considered for 1/ [(0.001/3) s+1].Therefore
Can set tuning formulae as：
Wherein, trFor time constant, PI controllers are mainly responsible for stable state compensation, too fast influence speed are not required, therefore
T can be designedrBetween 4~10 grid cyclic waves, for example, take tr=0.12.
(3) busbar voltage PI controllers are set up, and according to PI controller input value PI_in, calculate generatrix voltage compensation value
Vdc_ cmp, its expression formula is：
In formula, KpVFor busbar voltage PI controller proportionality coefficients；KiVFor busbar voltage PI controller integral coefficients；S is product
Divide operator.
For KpVAnd KiV, first, can make busbar voltage PI and reactive current PI that there is identical mode, thus two PI are controlled
Device processed will have identical time constant.Secondly, allow two PI controllers that there is close sensitivity to error originated from input, thus it is whole
Determining formula is：
In formula, K is weight coefficient；As K=1, two PI controllers are by with close regulating power；When taking K ＞ 1,
Voltage PI regulating powers are better than electric current PI, electric current PI is undertaken more steady-state errors；Conversely, when taking K ＜ 1, electric current PI is adjusted
Energy-conservation power is better than voltage PI, voltage PI is undertaken more steady-state errors.trFor time constant, PI controllers are mainly responsible for stable state
Compensation, too fast influence speed is not required, therefore can design trBetween 4~10 grid cyclic waves, for example, take tr=
0.12。
2nd, hystersis controller is set up, behaviour is enabled and reset to busbar voltage PI controllers and reactive current PI controllers
Make.Specifically logic is：
As grid line voltage amplitude maximum Umax,LWith stable state busbar voltage reference value Vdc_ std_ref difference is more than stagnant ring
During upper limit hys_up, busbar voltage PI controllers and reactive current PI controllers are enabled；
As grid line voltage amplitude maximum Umax,LWith stable state busbar voltage reference value Vdc_ std_ref difference is less than stagnant ring
During lower limit hys_dw, busbar voltage PI controllers and reactive current PI controllers are closed, and to the output valve of two PI controllers
Vdc_ cmp and Id_ cmp is reset；
Generally, stable state busbar voltage reference value Vdc_ std_ref is set to 1070；Stagnant ring upper limit hys_up is set to 0,
Ring width scope is 0~94.Ring width is too small to cause PI controller frequent switchings, be unfavorable for system control；Ring width crosses conference increase
The blind area of Hysteresis control, i.e.,：When height wears rear current path in the range of ring width, PI controllers can be still made to work in negative amplitude limit area,
Cause Hysteresis control disabler.Consider, it is -50 to design stagnant ring lower limit hys_dw.
3rd, the high busbar voltage reference value V worn under state is calculateddc_ ref and reactive current reference value Id_ ref, including it is following
Step：
(1) by busbar voltage PI controller output valves Vdc_ cmp wears busbar voltage estimated value V with heightdc_ evl sums, and will
As a result voltage clipper and voltage slope limiter are sequentially sent to, busbar voltage reference value V is obtaineddc_ref。
Voltage clipper logic is：
As busbar voltage optimal working point VdcMore than VmaxWhen, VdcEqual to Vmax；
As busbar voltage optimal working point VdcLess than VminWhen, VdcEqual to Vmin；
As busbar voltage optimal working point VdcBetween VminTo VmaxWhen, VdcValue does not change；
Wherein, VminReference value when being controlled for busbar voltage stable state general to use 1070 more；VmaxFor bus dangerous voltage
Value general to use 1150 more.
Voltage slope limiter logic is：
Busbar voltage optimal working point unit interval after amplitude limit rises or falls value more than dVWhen, the value is equal to dV；
Busbar voltage optimal working point unit interval after amplitude limit rises or falls value less than dVWhen, the value does not become
Change；
Wherein, dVFor voltage slope limits value.
For voltage slope limits value dVValue, should be adjusted according to combining inverter double-closed-loop control characteristic.First,
Slope dVThe rate of change of outer voltage is should be less than, otherwise slope is meaningless.For example：According to combining inverter double-closed-loop control system
System parameter, can be about 0.025s the approximate estimation a certain combining inverter outer shroud response time；Due to the excursion of dc bus
For [1070,1150] V, therefore, dVMaximum is (1150V-1070V)/0.025s=3.2kV/s.Secondly, reduced to try one's best
The modulation time, the dc bus response time should be allowed in 4 cycles, i.e. dVMinimum value be (1150V-1070V)/(4 × 0.02s)=
1kV/s.In summary, dVSpan be：1kV/s≤dV＜ 3.2kV/s, larger slope can reduce the ovennodulation time, but
Dash current can be caused, system reliability is reduced.Consider, the combining inverter example lifted for this programme, voltage is oblique
Rate limits value can be set to dV=1.5kV/s.
(2) by reactive current PI controller output valves Id_ cmp wears busbar voltage estimated value I with heightd_ evl sums, and will knot
Fruit is sequentially sent to current limiter and current slope limiter, obtains reactive current reference value Id_ref。
Current limiter logic is：
As reactive current optimal working point IqMore than ImaxWhen, IqEqual to Imax；
As reactive current optimal working point IqLess than IminWhen, IqEqual to Imin；
As reactive current optimal working point IqBetween IminTo ImaxWhen, IqValue does not change；
Wherein, IminReference value when being controlled for reactive current stable state general to use 0 more；ImaxIt can be sent for reactive current
Maximum current value, the value is typically chosen according to Converter Capacity, for example：1.5MW double-feed current transformers use 450.
Current slope limiter logic is：
Reactive current optimal working point unit interval after amplitude limit rises or falls value more than dIWhen, the value is equal to dI；
Reactive current optimal working point unit interval after amplitude limit rises or falls value less than dIWhen, the value does not become
Change；
Wherein, dIFor voltage slope limits value.
For current slope limits value dIValue, should be adjusted according to combining inverter double-closed-loop control characteristic.First,
Slope dIThe rate of change of current inner loop should be respectively smaller than, otherwise slope is meaningless.For example：According to combining inverter two close cycles control
Systematic parameter processed, can be about 0.001s the approximate estimation a certain combining inverter inner ring response time；Due to IdExcursion be
[0,450] A, therefore, dIMaximum is (450A-0A)/0.001s=450kA/s.Secondly, to reduce the ovennodulation time as far as possible,
The reactive current response time should be allowed in 2 cycles, i.e. dIMinimum value is (450A-0A)/(2 × 0.02s)=11.25kA/s.It is comprehensive
It is upper described, dISpan be：11.25kA/s≤dI＜ 450kA/s, larger slope can reduce the ovennodulation time, but can draw
Dash current is played, system reliability is reduced.Consider, the combining inverter example lifted for this programme, current slope limit
Value processed can be set to dI=20kA/s.
4th, by the 3rd step acquired results busbar voltage reference value Vdc_ ref and reactive current reference value Id_ ref is used as tradition
The busbar voltage reference value and reactive current reference value of combining inverter double-closed-loop control, for combining inverter control.
Actual verification, when line voltage is increased to 1.2 times, control effect such as Fig. 2 are carried out to technical scheme
It is shown.As seen from Figure 2, using technical scheme, it can effectively suppress the adverse effect of power network overvoltage generation, make
Combining inverter smoothly completes high voltage crossing.
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
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (6)
1. a kind of combining inverter high voltage crossing control method based on PI compensators, it is characterised in that：Comprise the following steps：
S1, the maximum V for inverter outlet line voltage amplitude of samplingmax,L, bus voltage value Vdc, ovennodulation compensation rate B, calculate
PI controller input values PI_in；
S2, reactive current PI controllers, busbar voltage PI controllers, the PI that will be obtained in step S1 are enabled by hystersis controller
Controller input value PI_in introduces reactive current PI controllers, the calculating of busbar voltage PI controllers and obtains reactive-current compensation value
Id_ cmp, generatrix voltage compensation value Vdc_cmp；
S3, the offset I that reactive current PI controllers are exportedd_ cmp wears reactive current estimated value I with heightd_ evl sums, and will tie
Fruit introduces current limiter, current slope limiter successively, obtains reactive current reference value Id_ref；
The offset V that busbar voltage PI controllers are exporteddc_ cmp wears busbar voltage estimated value V with heightdc_ evl sums, and will knot
Fruit introduces voltage clipper and voltage slope limiter successively, obtains busbar voltage reference value Vdc_ref；
S4, by the reactive current reference value I obtained in step S3d_ ref, busbar voltage reference value Vdc_ ref is respectively as grid-connected
Busbar voltage reference value, the reactive current reference value of inverter double-closed-loop control, for combining inverter control.
2. a kind of combining inverter high voltage crossing control method based on PI compensators according to claim 1, it is special
Levy and be：In the step S1, use calculation formula for：
PI_in=Vmax,L-(Vdc-B) (1)
In formula, Vmax,LFor the maximum of inverter outlet line voltage amplitude；VdcFor bus voltage value；B is ovennodulation compensation rate.
3. a kind of combining inverter high voltage crossing control method based on PI compensators according to claim 1, it is special
Levy and be：In the step S2, hystersis controller is enabled and clearly to busbar voltage PI controllers, reactive current PI controllers
Zero controls, and its control method is：
As grid line voltage amplitude maximum Umax,LWith stable state busbar voltage reference value Vdc_ std_ref difference is more than the stagnant ring upper limit
During hys_up, busbar voltage PI controllers and reactive current PI controllers are enabled；
As grid line voltage amplitude maximum Umax,LWith stable state busbar voltage reference value Vdc_ std_ref difference is less than stagnant ring lower limit
During hys_dw, busbar voltage PI controllers and reactive current PI controllers are closed, and to the output valve V of two PI controllersdc_
Cmp and Id_ cmp is reset.
4. a kind of combining inverter high voltage crossing control method based on PI compensators according to claim 1, it is special
Levy and be：In the step S2, generatrix voltage compensation value V is calculated by busbar voltage PI controllersdc_ cmp expression formula is
In formula, KpVFor busbar voltage PI controller proportionality coefficients；KiVFor busbar voltage PI controller integral coefficients；S calculates for integration
Son.
5. a kind of combining inverter high voltage crossing control method based on PI compensators according to claim 1, it is special
Levy and be：In the step S2, reactive-current compensation value I is calculated by reactive current PI controllersd_ cmp expression formula is：
In formula, KpIFor reactive current PI controller proportionality coefficients；KiIFor reactive current PI controller integral coefficients, s calculates for integration
Son.
6. a kind of combining inverter high voltage crossing control system based on PI compensators described in application claim 1, it is special
Levy and be：Including high voltage crossing control module, two close cycles vector control module, the high voltage crossing control module includes stagnant
Ring controller, busbar voltage control module, reactive current control module, the busbar voltage control module, reactive current control
The output end connection two close cycles vector control module of module；
The reactive current control module includes reactive current PI controllers, current limiter, current slope limiter, San Zheyi
Secondary connection；
The busbar voltage control module includes busbar voltage PI controllers, voltage clipper, voltage slope limiter, San Zheyi
Secondary connection；
Signal output part connection reactive current PI controllers, the busbar voltage PI controllers of the hystersis controller, for mother
Line voltage PI controllers and reactive current PI controllers are enabled and reset control.
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| CN111313423A (en) * | 2019-11-27 | 2020-06-19 | 天津瑞能电气有限公司 | Optimized active power filter current linear control method |
| CN116545040A (en) * | 2023-07-07 | 2023-08-04 | 锦浪科技股份有限公司 | Active current control method, device and system in low voltage ride through and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111313423A (en) * | 2019-11-27 | 2020-06-19 | 天津瑞能电气有限公司 | Optimized active power filter current linear control method |
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| CN111049440A (en) * | 2019-12-27 | 2020-04-21 | 上海奇电电气科技股份有限公司 | Synchronous motor control method, synchronous motor control device, synchronous motor controller, synchronous motor drive device and storage medium |
| CN116545040A (en) * | 2023-07-07 | 2023-08-04 | 锦浪科技股份有限公司 | Active current control method, device and system in low voltage ride through and storage medium |
| CN116545040B (en) * | 2023-07-07 | 2023-09-26 | 锦浪科技股份有限公司 | Active current control method, device and system in low voltage ride through and storage medium |
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Effective date of registration: 20230710 Address after: No. 100, Hangtian Road, Tianjin Pilot Free Trade Zone (Airport Economic Zone), Binhai, Tianjin 300450 Patentee after: TIANJIN RUIYUAN ELECTRICAL Co.,Ltd. Address before: No.1 Xinghua No.7 Branch Road, economic development zone, Xiqing District, Tianjin Patentee before: Tianjin Ruineng electric Co.,LTD. |
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