CN106452149B - A kind of ISOP inverter system with output voltage bending upwards is without interconnection Pressure and Control strategy - Google Patents
A kind of ISOP inverter system with output voltage bending upwards is without interconnection Pressure and Control strategy Download PDFInfo
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- CN106452149B CN106452149B CN201610948403.8A CN201610948403A CN106452149B CN 106452149 B CN106452149 B CN 106452149B CN 201610948403 A CN201610948403 A CN 201610948403A CN 106452149 B CN106452149 B CN 106452149B
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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Abstract
The invention discloses a kind of ISOP inverter systems with output voltage bending upwards without interconnection Pressure and Control strategy.Its control program are as follows: virtual resistance R is added in the control of every inverter modulevirMake the output impedance of inverter in resistive, by by modules input voltage ViniThe output voltage amplitude that is added to gives E*In, so that the presentation of system output voltage amplitude is upwarped adjustment characteristic, obtains virtual voltage reference amplitude Ei；The reactive power Q that modules are exportediThe output voltage reference frequency that is added to f*In obtain virtual voltage reference frequency fi；Synthesized sinusoidal signal ErefiThe pressure drop on virtual resistance is subtracted afterwards obtains the reference voltage V of each inverter modulerefi, the driving signal of switching tube is obtained using voltage and current double closed-loop and driving link.Output impedance is designed to resistive by the present invention by reseting the output impedance of inverter in low pressure occasion, and realizes without interconnection Pressure and Control, is greatly expanded the application without interconnection ISOP inverter system.
Description
Technical field
The present invention relates to ISOP inverter systems without interconnection pressure equalizing control method, has output voltage more particularly to one kind
The ISOP inverter system of bending upwards is without interconnection Pressure and Control strategy.
Background technique
As distributed new accesses distribution network system more and more, in order to meet, distributed generation resource is high-quality grid-connected to be connect
Enter, domestic and foreign scholars have carried out intelligent AC/DC distribution system research one after another, use electric power electricity mostly in such systems
Sub- transformer come realize combined-voltage convert.The electric power electric transformer scheme series-parallel using multiple transformer, in high-pressure side
Series connection is to improve voltage class, and low-pressure side parallel connection is to improve power grade.It is every by can reduce in series and parallel for inverter system
The input voltage and output electric current of a module, can reduce the capacity of switching device in this way, reduce development difficulty.Input series connection is defeated
(ISOP) inverter system in parallel must realize that the input of each converter submodule is pressed first and flow with output out, secondly,
Realize that the modularized design of power circuit and control circuit could improve the reliability and scalability of whole system simultaneously.
Research at present to ISOP inverter system without interconnection Pressure and Control strategy is relatively fewer, has scholar to propose a kind of inversion
The control strategy of device output inductor current cross feedback, the input that modules may be implemented after addition Pressure and Control are equal
Pressure, but shortcoming is all converter shared control units, reduces the reliability of system.Application No. is 201510347580.6
Patent propose " a kind of ISOP inverter system without interconnection pressure equalizing control method ", core control is inverter output frequency
It is upwarped with input voltage, output voltage is sagging with output reactive power.This scheme is in the feelings that the transfer impedance of inverter is in perception
The input voltage that modules may be implemented under condition is balanced with output power.The induction reactance on the usual offline road of high pressure occasion is much larger than resistance
Anti-, for the equivalent output impedance of inverter in perception, above-mentioned control strategy is feasible.However line impedance is wanted in low-voltage distribution system
Greater than induction reactance, the defeated impedance deviation of the transmission of inverter is resistive, and above-mentioned control strategy is no longer feasible.
Summary of the invention
Goal of the invention: the main purpose of the present invention is to provide a kind of ISOP inverter systems with output voltage bending upwards
Without interconnection Pressure and Control strategy, the output impedance by reseting inverter is resistive and is realized using corresponding control strategy each
The input of module, which is pressed and exported, flows.
Technical solution:
A kind of ISOP inverter system with output voltage bending upwards without interconnection Pressure and Control strategy, comprising steps of
Step 1): virtual resistance R is added in the control of each inverter modulevir, make the output of each inverter module
Impedance is in resistive；The implementation method of the virtual resistance are as follows: the output electric current that each inverter module is sampled in control, by it
Multiplied by the pressure drop on virtual resistance artifical resistance, and be added in the form of negative-feedback the module output voltage it is given in；
Step 2): the input voltage V of each inverter module is sampledini, output voltage VoiAnd output inductor electric current
ILfi, and the reactive power Q that each inverter module exports is calculated by power calculation uniti；
Step 3): pass through governing equation Ei=Ei *+mViniAnd fi=fi *+nQiEach inverter module output is calculated
The practical reference amplitude E of voltageiWith practical reference frequency fi；Wherein, Ei *And fi *Respectively each inverter module gives
Reference frequency and reference voltage；M is that output voltage upwarps coefficient, and n is that frequency upwarps coefficient；
Step 4): the practical reference frequency f that step 3) is calculatediWith actual reference voltage amplitude EiThe sinusoidal letter of synthesis
Number Erefi, and the sinusoidal signal E by synthesizingrefiSubtract each other to obtain each inverter module with the product of inductive current and virtual resistance
Reference voltage Vrefi；
Step 5): the inverter reference voltage V that step 4) is obtainedrefiObtained output voltage V is sampled with step 2)oiPhase
Subtract, obtains the reference current I of modules current inner loop by pi regulatorrefi；
Step 6): the reference current I that step 5) is obtainedrefiObtained output inductor electric current is sampled with step 2)
ILfiSubtract each other, obtain the modulated signal of each inverter module by P adjuster, is controlled by PWM and generate PWM drive signal drive
That moves each inverter module main circuit switch pipe opens shutdown.
The control strategy is distributed AC servo system strategy, i.e., above-mentioned each step is the independent control to each inverter module
It makes, any cross-coupling, i=1,2 ..., N in above-mentioned steps is not present in the control between modules.
The reference voltage V of inverter in the step 4)refiIt is obtained by formula (1):
Vrefi=Eisin(2πfi·t+ai)-Rvir·ILfi (1)
Wherein, t is time variable, aiFor initial phase angle, i=1,2,3 ... N, N > 0.
Each inverter module is two-stage system, and prime is isolation type DC-DC converter, and rear class is inverter.
The utility model has the advantages that output impedance is designed to hinder by the present invention by reseting the output impedance of inverter in low pressure occasion
Property, and realized with corresponding control strategy without interconnection Pressure and Control, it is greatly expanded without interconnection ISOP inverter system
Application.
Detailed description of the invention
Fig. 1 is addition virtual resistance without interconnection ISOP inverter system control strategy；
Fig. 2 is the main circuit schematic diagram of ISOP inverter system individual module；
Fig. 3 is the ISOP inverter system of two modules composition；
Fig. 4 is output impedance inverter Pressure and Control characteristic curve when being resistive；
The input voltage wave of modules when Fig. 5 is the ISOP inverter system input voltage transition of two modules composition
Shape；
The active power of modules output when Fig. 6 is the ISOP inverter system input voltage transition of two modules composition
Waveform；
The reactive power of modules output when Fig. 7 is the ISOP inverter system input voltage transition of two modules composition
Waveform；
Modules output current wave when Fig. 8 is the ISOP inverter system input voltage transition of two modules composition.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
Fig. 1 is the ISOP inverter system control block diagram that virtual resistance is added, each inverter module using identical and
Independent control circuit, and there is no any communication to interconnect between each control circuit.Control strategy of the present invention is suitable for each
Inverter module output impedance is in resistive parallelly connected reverse converter system.The line electricity of the usual low pressure occasions such as micro-capacitance sensor and power distribution network
Resistance is greater than inductance, and the resistive of inverter output impedance is greater than perception under the occasion, and high pressure occasion is exactly the opposite, so this patent
Control program be suitable for low pressure occasion.It, can be each in order to increase the resistive composition of each inverter to mention high control precision
Virtual resistance R is added in the control of a inverter modulevirMake the output impedance of each inverter in resistive.
The method of the present invention includes the following steps:
Step 1): virtual resistance R is added in the control of each inverter modulevir.The implementation method of virtual resistance are as follows:
The output electric current that each inverter module is sampled in control, by its multiplied by virtual resistance can pressure drop on artifical resistance, and
Be added in the form of negative-feedback the module output voltage it is given in.
Step 2): the input voltage V of each inverter module is sampledini, output voltage VoiAnd output inductor electric current
ILfi, and the reactive power Q that each inverter module exports is calculated by power calculation uniti；
Step 3): pass through governing equation Ei=Ei *+mViniAnd fi=fi *+nQiEach inverter module output is calculated
The practical reference amplitude E of voltageiWith practical reference frequency fi, wherein Ei *And fi *Respectively each inverter module gives
Reference frequency and reference voltage；Known by above-mentioned governing equation, as the input voltage V of some moduleiniWhen raising, module output
The reference amplitude Ei of voltage is increased, i.e., the output voltage amplitude of modules is in upwarp adjustment characteristic with input voltage, defeated
The amplitude that voltage magnitude upwarps out, which is upwarped Coefficient m by output voltage, to be influenced.Similarly, modules output voltage frequency is with the mould
The reactive power of block output is that frequency upwarps coefficient in adjustment characteristic, n is upwarped, as shown in Figure 4.
Step 4): the practical reference frequency f that step 3) is calculatediWith actual reference voltage amplitude EiThe sinusoidal letter of synthesis
Number Erefi, and the sinusoidal signal E by synthesizingrefiSubtract each other to obtain each inverter module with the product of inductive current and virtual resistance
Reference voltage Vrefi；
Step 5): the inverter reference voltage V that step 4) is obtainedrefiObtained output voltage V is sampled with step 2)oiPhase
Subtract, proportional integration (PI) adjuster by outer voltage obtains the reference current I of modules current inner looprefi；
Step 6): the reference current I that step 5) is obtainedrefiObtained output inductor electric current is sampled with step 2)
ILfiSubtract each other, ratio (P) adjuster by current inner loop obtains the modulated signal of each inverter module, controls and produces by PWM
What raw PWM drive signal drove each inverter module main circuit switch pipe opens shutdown.
I=1,2,3 ... N in above each step, N > 0.
In addition, virtual impedance is added in control strategy, in actual circuit and it is not present.
The calculation formula of inverter reference voltage in step 3) and step 4) are as follows:
Vrefi=Eisin(2πfi·t+ai)-Rvir·ILfi (1)
Wherein t is time variable, aiFor initial phase angle, i=1,2,3 ... N, N > 0.
In addition, each inverter module is two-stage system, prime is isolation type DC-DC converter, and rear class is inverter.
Technical solution of the present invention is illustrated for following two module I SOP inverter system (as shown in Figure 3).
The control characteristic curve of each inverter module is that output frequency is upwarped with output reactive power, and output voltage is with defeated
Enter voltage to upwarp, as shown in Figure 4.It is now assumed that two module input voltages, which are disturbed, makes Vin1>Vin2, according to control characteristic song
Line, 1 output reference voltage of inverter rise.Since the active power of the big module output of resistive inverter output voltage is high, then
Inverter 1 will export more active power, and input end capacitor electric discharge makes Vin1Decline, similarly Vin2It will rise, system is returned again
To stable state.In fact, power conservation knows, the equilibrium for controlling input voltage just controls the equilibrium of its active power of output.It is false again
If load end, which is disturbed, makes inverter output reactive power Q1>Q2, according to control characteristic curve, in the reference frequency of inverter 1
It rises.Since the big module output reactive power of inverter frequency is low, then 1 module of inverter will reduce idle output, i.e. Q1Reduce,
Similarly Q2It will increase, the reactive power of the output of system returns to equalization point.Then in the case where input and output disturb, pass through institute
The control strategy of proposition, the active power and reactive power of each inverter module output can keep in balance.Fig. 5 describes two
The input voltage waveform of the ISOP inverter system of module composition, in t < 0.8s, system has reached stable state, in t=0.8s,
System voltage is jumped by 400V to the input voltage waveform of two modules of 500V, wherein Vin1For the input voltage of module 1#, Vin2
For the input voltage of module 2#, it can be seen that after of short duration adjustment process, each equal subsystem input voltage of module.Fig. 6 and
Fig. 7 is the active power and reactive power of module 1# and module 2# output before and after input voltage mutation.As can be seen that defeated in system
Enter end when disturbing, the active power and reactive power that modules export can restrain.Simultaneously from the dynamic process of adjusting
It can be found that when the input voltage of module 1# is higher, output voltage reference amplitude signal increases, then its output is active
Power increases, and output current amplitude increases (as shown in Figure 8), in this way reduces module 1# input voltage, and the tune of module 2#
It is exactly the opposite to save direction, so that system be made to reenter stable state.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of ISOP inverter system with output voltage bending upwards is without interconnection Pressure and Control strategy, it is characterised in that:
Comprising steps of
Step 1): virtual resistance R is added in the control of each inverter modulevir；The implementation method of the virtual resistance are as follows:
The output inductor electric current that each inverter module is sampled in control, by it multiplied by the pressure on virtual resistance artifical resistance
Drop, and be added in the form of negative-feedback the module output voltage it is given in；
Step 2): the input voltage V of each inverter module is sampledini, output voltage VoiAnd output inductor electric current ILfi,
And the reactive power Q of each inverter module output is calculated by power calculation uniti；
Step 3): pass through governing equation Ei=Ei *+mViniAnd fi=fi *+nQiEach inverter module output voltage is calculated
Practical reference amplitude EiWith practical reference frequency fi；Wherein, Ei *And fi *The reference voltage width of respectively each inverter module
Value and given reference frequency；M is that output voltage upwarps coefficient, and n is that frequency upwarps coefficient；
Step 4): the practical reference frequency f that step 3) is calculatediWith actual reference voltage amplitude EiSynthesize sinusoidal signal
Erefi, and the sinusoidal signal E by synthesizingrefiSubtract each other to obtain each inversion with the product of output inductor electric current and virtual resistance
The reference voltage V of device modulerefi；
Step 5): the inverter reference voltage V that step 4) is obtainedrefiObtained output voltage V is sampled with step 2)oiSubtract each other,
The reference current I of modules current inner loop is obtained by pi regulatorrefi；
Step 6): the reference current I that step 5) is obtainedrefiObtained output inductor electric current I is sampled with step 2)LfiPhase
Subtract, obtain the modulated signal of each inverter module by P adjuster, it is each to control generation PWM drive signal driving by PWM
Inverter module main circuit switch pipe opens shutdown.
2. ISOP inverter system according to claim 1 is without interconnection Pressure and Control strategy, it is characterised in that: the control
Strategy is distributed AC servo system strategy, i.e., above-mentioned each step is the independent control to each inverter module, between modules
Control any cross-coupling, i=1,2 ..., N in above-mentioned steps is not present.
3. ISOP inverter system according to claim 1 is without interconnection Pressure and Control strategy, it is characterised in that: the step
4) the reference voltage V of inverter inrefiIt is obtained by formula (1):
Vrefi=Eisin(2πfi·t+ai)-Rvir·ILfi (1)
Wherein, t is time variable, aiFor initial phase angle, i=1,2,3 ... N, N > 0.
4. ISOP inverter system according to claim 1 is without interconnection Pressure and Control strategy, it is characterised in that: each described
Inverter module is two-stage system, and prime is isolation type DC-DC converter, and rear class is inverter.
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| CN108540004B (en) * | 2018-04-17 | 2019-12-13 | 特变电工西安电气科技有限公司 | Control method for inhibiting midpoint potential fluctuation of three-level Boost converter unit |
| CN109347330B (en) * | 2018-11-16 | 2019-10-11 | 合肥工业大学 | Type modular input based on communication joins output-parallel converter pressure equalizing control method |
| CN110676890B (en) * | 2019-10-18 | 2023-04-18 | 燕山大学 | Mode switching control method during networking operation of alternating current-direct current hybrid micro-grid |
| CN110855150B (en) * | 2019-11-22 | 2021-04-06 | 太原理工大学 | Virtual impedance-based direct current solid-state transformer control method |
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| CN104917417A (en) * | 2015-06-19 | 2015-09-16 | 东南大学 | ISOP inverter system interconnection-free voltage-sharing control method |
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| CN104917417A (en) * | 2015-06-19 | 2015-09-16 | 东南大学 | ISOP inverter system interconnection-free voltage-sharing control method |
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