CN110365038A - Control method, control device and the microgrid inverter of microgrid inverter - Google Patents
Control method, control device and the microgrid inverter of microgrid inverter Download PDFInfo
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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
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Abstract
The present invention provides control method, control device and the microgrid inverter of a kind of microgrid inverter, the microgrid inverter includes power device, and the control method includes: detecting step: output voltage, operating voltage and the operating current of the microgrid inverter are detected under micro-capacitance sensor off-network state；Double-closed-loop control step: determining each harmonic in the output voltage of the microgrid inverter of detection, executes double-closed-loop control based on each harmonic and the operating voltage and operating current of detection；Drive pulse signal generates step: the drive pulse signal for controlling the power device is generated according to the result of double-closed-loop control, so that microgrid inverter output loads consistent power with micro-capacitance sensor.Using the control method of microgrid inverter of the invention, control device and microgrid inverter, ability of the microgrid inverter with nonlinear load can be improved.
Description
Technical field
All things considered of the present invention is related to field of new energy technologies, more particularly, is related to a kind of control of microgrid inverter
Method, control device and microgrid inverter processed.
Background technique
Micro-capacitance sensor is the system unit that one group of control device, energy storage device, load and micro battery are constituted, and supplies electricity to load
Energy.Micro-capacitance sensor can both be incorporated into the power networks with external electrical network, can also be with isolated operation.In micro-capacitance sensor, it usually needs pass through micro- electricity
Net inverter (that is, electronic power convertor) accesses external electrical network or load.
In general, microgrid inverter provides harmonic current to nonlinear load under micro-capacitance sensor off-network state.However, micro-
The harmonic current of grid inverters output can generate harmonic wave pressure drop in output impedance, and then lead to the output of microgrid inverter
Voltage generates harmonic voltage, and the power quality of microgrid inverter is made to be deteriorated.
Summary of the invention
The purpose of the present invention is to provide a kind of control method of microgrid inverter, control device and micro-capacitance sensor inversions
Ability of the microgrid inverter with nonlinear load can be improved in device.
An aspect of of the present present invention provides a kind of control method of microgrid inverter, and the microgrid inverter includes power
Device, the control method includes: detecting step: the output electricity of the microgrid inverter is detected under micro-capacitance sensor off-network state
Pressure, operating voltage and operating current；Double-closed-loop control step: in the output voltage for determining the microgrid inverter of detection
Each harmonic executes double-closed-loop control based on each harmonic and the operating voltage and operating current of detection；Driving
Pulse signal generates step: the drive pulse signal for controlling the power device is generated according to the result of double-closed-loop control,
So that the microgrid inverter output loads consistent power with micro-capacitance sensor.
Optionally, the microgrid inverter further includes reactor and filter condenser, wherein detecting step further include:
DC bus-bar voltage, the output three-phase voltage of the microgrid inverter, the reactor are detected under micro-capacitance sensor off-network state
Inductance three-phase current, the filter condenser capacitor three-phase current；Double-closed-loop control step further include: determine the institute of detection
State each harmonic in output three-phase voltage, the inductance three-phase current and the electricity based on each odd harmonic and detection
Hold three-phase current and executes double-closed-loop control；Drive pulse signal generates step further include: according to the result of double-closed-loop control and institute
It states DC bus-bar voltage and generates drive pulse signal for controlling the power device, so that the microgrid inverter exports
Consistent power is loaded with micro-capacitance sensor.
Optionally, the double-closed-loop control step further include: be based on the output three-phase voltage, the inductance three-phase current
The voltage given value of the Voltage loop in double-closed-loop control is determined with the capacitor three-phase current；Determine the output three-phase voltage
Each harmonic voltage given value；The electric current in double-closed-loop control is determined based on the voltage given value and the output three-phase voltage
The given value of current value of ring；Wherein, the drive pulse signal generates step further include: is based on the given value of current value, the electricity
Sense three-phase current, the capacitor three-phase current and the DC bus-bar voltage generate the driving arteries and veins for controlling the power device
Rush signal.
Optionally, the double-closed-loop control step further include: by the inductance three-phase current and the capacitor three-phase current
It is added, obtains the output three-phase current of the inverter；To the output three-phase voltage, the inductance three-phase current and described defeated
Three-phase current carries out Park transformation respectively out, obtains the output DC component of three-phase voltage, the inductance three-phase current
The DC component of DC component and the output three-phase current；The DC component of the output three-phase current is set to pass sequentially through cascade
Two trappers, obtain it is described output three-phase current filter value.
Optionally, the double-closed-loop control step further include: determine the output voltage of virtual synchronous generator model；According to
The filter value of the output voltage, virtual impedance and the output three-phase current determines the voltage given value of the Voltage loop.
Optionally, the double-closed-loop control step further include: Park transformation is carried out to each harmonic voltage, and to change
The result changed carries out moving average filter, to obtain the DC component of each harmonic voltage；Calculate each harmonic voltage
The inverse value of DC component carries out proportional integration adjusting to inverse value, and the result of comparative example integral adjustment is carried out comprising angle
The Ipark of compensation is converted, to obtain each harmonic voltage given value.
Optionally, the double-closed-loop control step further include: by the voltage given value and the output three-phase voltage
DC component is subtracted each other, and is executed proportional integration to the result subtracted each other and is adjusted, and the result that proportional integration is adjusted is as the electric current
The given value of current value of ring；Proportional integration tune is executed to the difference of the DC component of the given value of current value and the inductance three-phase current
The result that proportional integration is adjusted is added by section with the voltage coupling terms that the reactor generates, and is carried out to the result of addition
Ipark transformation, to obtain the voltage given value under two-phase stationary coordinate system；Voltage under the two-phase stationary coordinate system is given
Value is added to each harmonic voltage given value, to obtain the total voltage given value controlled for space vector pulse width modulation；
Wherein, the drive pulse signal generates step further include: is produced according to the total voltage given value and the DC bus-bar voltage
Give birth to the drive pulse signal for controlling the power device.
Optionally, the rotation angle of the Park transformation is to be generated by the functions combination of virtual synchronous generator model
Angle.
Optionally, the centre frequency of a trapper in described two trappers is the output frequency of the inverter
6 times, the centre frequency of another trapper is 12 times of the output frequency of the inverter.
Optionally, the control method is compensated by Digital Control mode and is drawn by the delay that the control instruction period introduces
The harmonic wave risen.
Another aspect of the present invention also provides a kind of control device of microgrid inverter, and the microgrid inverter includes
Power device, the control device include: detection unit, are configured as detecting the micro-capacitance sensor under micro-capacitance sensor off-network state inverse
Become output voltage, operating voltage and the operating current of device；Double-closed-loop control unit is configured to determine that the microgrid inverter
Output voltage in each harmonic, the microgrid inverter detected based on each harmonic and the detection unit
Operating voltage and operating current execute double-closed-loop control；Drive pulse signal generates unit, according to the result of double-closed-loop control
The drive pulse signal for controlling the power device is generated, so that microgrid inverter output and micro-capacitance sensor load one
The power of cause.
Optionally, the microgrid inverter further includes reactor and filter condenser, wherein the detection unit also by
It is configured to detect the output three-phase voltage, described of DC bus-bar voltage, the microgrid inverter under micro-capacitance sensor off-network state
The capacitor three-phase current of the inductance three-phase current of reactor, the filter condenser；The double-closed-loop control unit is also configured
For each harmonic in the output three-phase voltage of determination detection unit detection, based on each odd harmonic and described
The inductance three-phase current and the capacitor three-phase current of detection unit detection execute double-closed-loop control；Drive pulse signal produces
Raw unit is additionally configured to be generated according to the result of double-closed-loop control and the DC bus-bar voltage for controlling the power device
The drive pulse signal of part, so that microgrid inverter output loads consistent power with micro-capacitance sensor.
Optionally, the double-closed-loop control unit is also configured to based on the output three-phase voltage, the inductance three-phase
Electric current and the capacitor three-phase current determine the voltage given value of the Voltage loop in double-closed-loop control；Determine the output three-phase electricity
The each harmonic voltage given value of pressure；It is determined in double-closed-loop control based on the voltage given value and the output three-phase voltage
The given value of current value of electric current loop；Wherein, the drive pulse signal generates unit and is also configured to based on the given value of current
Value, the inductance three-phase current, the capacitor three-phase current and the DC bus-bar voltage are generated for controlling the power device
The drive pulse signal of part.
Optionally, the double-closed-loop control unit is also configured to the inductance three-phase current and the capacitor three-phase
Electric current is added, and obtains the output three-phase current of the inverter；To the output three-phase voltage, the inductance three-phase current and institute
It states output three-phase current and carries out Park transformation respectively, obtain DC component, the inductance three-phase electricity of the output three-phase voltage
The DC component of the DC component of stream and the output three-phase current；Pass sequentially through the DC component of the output three-phase current
Cascade two trappers in the double-closed-loop control unit are set, the filter value of the output three-phase current is obtained.
Optionally, the double-closed-loop control unit is also configured to determine the output voltage of virtual synchronous generator model；
Determine that the voltage of the Voltage loop is given according to the filter value of the output voltage, virtual impedance and the output three-phase current
Value.
Optionally, the double-closed-loop control unit is also configured to carry out Park transformation to each harmonic voltage, and
Moving average filter is carried out to the result of transformation, to obtain the DC component of each harmonic voltage；Calculate each harmonic electricity
The inverse value of the DC component of pressure carries out proportional integration adjusting to inverse value, and the result of comparative example integral adjustment is included
The Ipark of angle compensation is converted, to obtain each harmonic voltage given value.
Optionally, the double-closed-loop control unit is also configured to the voltage given value and the output three-phase electricity
The DC component of pressure is subtracted each other, and is executed proportional integration to the result subtracted each other and is adjusted, and the result that proportional integration is adjusted is as described in
The given value of current value of electric current loop；To the poor execution ratio product of the DC component of the given value of current value and the inductance three-phase current
Point adjust, by proportional integration adjust result be added with the voltage coupling terms that the reactor generates, and to the result of addition into
Row Ipark transformation, to obtain the voltage given value under rest frame；By the voltage given value superposition under the rest frame
To each harmonic voltage given value, to obtain the total voltage given value controlled for space vector pulse width modulation；Wherein, institute
Drive pulse signal generation unit is stated to be also configured to generate use according to the total voltage given value and the DC bus-bar voltage
In the drive pulse signal for controlling the power device.
Optionally, the rotation angle of the Park transformation is to be generated by the functions combination of virtual synchronous generator model
Angle.
Optionally, the centre frequency of a trapper in described two trappers is the output frequency of the inverter
6 times, the centre frequency of another trapper is 12 times of the output frequency of the inverter.
Optionally, the double-closed-loop control unit includes digital controller, wherein the digital controller passes through number
Word control mode compensates harmonic wave caused by the delay introduced as the control instruction period.
Another aspect of the present invention also provides a kind of microgrid inverter including control device as described above.
Control method, control device and the microgrid inverter of microgrid inverter of the invention, based on the micro- of detection
The each harmonic of the output voltage of grid inverters executes double-closed-loop control, and based on the Ipark transformation pair comprising angle compensation
Each harmonic carry out phase compensation, thus inhibit each time in the output voltage of microgrid inverter caused by nonlinear load it is humorous
Wave improves ability of the microgrid inverter with nonlinear load.In addition, making micro- electricity by the external characteristics of simulation synchronous generator
The output of net inverter has inertia and damping, and keeps output frequency insensitive to the fluctuation of load, to improve micro-capacitance sensor
The stability of invertor operation.
Detailed description of the invention
By the detailed description carried out below in conjunction with the accompanying drawings, above and other objects of the present invention, features and advantages will
It becomes more fully apparent, in which:
Fig. 1 shows the block diagram of the control device of the microgrid inverter of embodiment according to the present invention；
Fig. 2 shows the topological structure schematic diagrames of the microgrid inverter of embodiment according to the present invention；
Fig. 3 shows the schematic diagram of the DC component for determining output three-phase voltage of embodiment according to the present invention；
Fig. 4 shows the schematic diagram of the DC component of the determination inductance three-phase current of embodiment according to the present invention；
Fig. 5 shows the schematic diagram of the filter value for determining output three-phase current of embodiment according to the present invention；
Fig. 6 shows the schematic diagram of the determination active power of embodiment according to the present invention and the filter value of reactive power；
Fig. 7 shows the schematic diagram of the determination rotation angle degree of embodiment according to the present invention；
Fig. 8 shows the signal of the voltage given value of the Voltage loop in the determination double-closed-loop control of embodiment according to the present invention
Figure；
Fig. 9 shows the schematic diagram of the determination each harmonic voltage given value of embodiment according to the present invention；
Figure 10 shows the control schematic diagram of digital controller；
Figure 11 shows the schematic diagram of the voltage given value under the determination two-phase stationary coordinate system of embodiment according to the present invention；
Figure 12 shows the schematic diagram of the generation drive pulse signal of embodiment according to the present invention；
Figure 13 does not carry out micro-capacitance sensor when harmonics restraint in the case where showing existing microgrid inverter band nonlinear load
The experiment output waveform of inverter；
Figure 14 show embodiment according to the present invention microgrid inverter band nonlinear load in the case where carry out harmonic wave
The experiment output waveform of microgrid inverter when inhibition；
Figure 15 shows the flow chart of the control method of the microgrid inverter of embodiment according to the present invention.
Specific embodiment
Now, different example embodiments is more fully described with reference to the accompanying drawings, wherein some exemplary embodiments are attached
It is shown in figure.
Control device, the micro- electricity of the microgrid inverter of embodiment according to the present invention are described referring to Fig. 1 to Figure 15
The control method and microgrid inverter of net inverter.
Fig. 1 shows the block diagram of the control device of the microgrid inverter of embodiment according to the present invention, and Fig. 2 shows according to this
The topological structure schematic diagram of the microgrid inverter of the embodiment of invention.
Referring to Fig.1, the control device of the microgrid inverter of embodiment according to the present invention include: detection unit 100, it is double
Closed Loop Control Unit 200 and drive pulse signal generate unit 300.
Referring to Fig. 2, microgrid inverter includes power device 400, reactor 500 and filter condenser 600 and control
Device (not shown).
Here, reactor 500 and filter condenser 600 form LC filter circuit, can filter out the generation of power device 400
High-frequency harmonic maintains excellent power quality.
Return Fig. 1, detection unit 100 detected under micro-capacitance sensor off-network state the microgrid inverter output voltage,
Operating voltage and operating current.
As an example, the output voltage of microgrid inverter can be the output three-phase voltage U of microgrid inverteroabc, should
The operating voltage of microgrid inverter can be DC bus-bar voltage Udc, the operating current of the microgrid inverter can be reactor
500 inductance three-phase current ILabcWith the capacitor three-phase current I of filter condenser 600Cabc。
As an example, detection unit 100 may include three-phase voltage sensor and threephase current transformer.
Double-closed-loop control unit 200 determines each time in the output voltage for the microgrid inverter that detection unit 100 detects
Harmonic wave, the microgrid inverter of each harmonic and detection unit 100 detection of the output voltage based on the microgrid inverter
Operating voltage and operating current execute double-closed-loop control.
Preferably, double-closed-loop control unit 200 determines the output three-phase voltage U that detection unit 100 detectsoabcIn each time
Harmonic wave, the inductance three-phase current I detected based on each odd harmonic and detection unit 100LabcWith capacitor three-phase current ICabcIt holds
Row double-closed-loop control.
Drive pulse signal generates unit 300 and is generated according to the result of double-closed-loop control for controlling power device 400
Drive pulse signal, so that microgrid inverter output loads consistent power with micro-capacitance sensor.
Preferably, drive pulse signal generates unit 300 according to the result and DC bus-bar voltage U of double-closed-loop controldcIt produces
The drive pulse signal for controlling power device 400 is given birth to, so that microgrid inverter output loads consistent function with micro-capacitance sensor
Rate.
Further, double-closed-loop control unit 200 is based on output three-phase voltage Uoabc, inductance three-phase current ILabcAnd capacitor
Three-phase current ICabcDetermine the voltage given value U of the Voltage loop in double-closed-loop controlodref、Uoqref；Determine output three-phase voltage
UoabcEach harmonic voltage given value Ualfahref、Ubetahref；Based on voltage given value Uodref、UoqrefWith output three-phase voltage
UoabcDetermine the given value of current value I of the electric current loop in double-closed-loop controldref、Iqref.Drive pulse signal generates unit 300 and is based on
Given value of current value Idref、Iqref, inductance three-phase current ILabc, capacitor three-phase current ICabcWith DC bus-bar voltage UdcGeneration is used for
Control the drive pulse signal of power device 400.
It is executed below with reference to the control device that Fig. 3 to Figure 11 carrys out the microgrid inverter of detailed description of the present invention embodiment
Double-closed-loop control is to generate the process of drive pulse signal.
Fig. 3 shows the schematic diagram of the DC component for determining output three-phase voltage of embodiment according to the present invention, and Fig. 4 is shown
The schematic diagram of the DC component of the determination inductance three-phase current of embodiment according to the present invention, Fig. 5 show reality according to the present invention
Apply the schematic diagram of the filter value for determining output three-phase current of example.
Referring to Fig. 3 to Fig. 5, double-closed-loop control unit 200 is by inductance three-phase current ILabcWith capacitor three-phase current ICabcPhase
Add, obtains the output three-phase current I of microgrid inverteroabc；To output three-phase voltage Uoabc, inductance three-phase current ILabcWith it is defeated
Three-phase current I outoabcPark transformation is carried out respectively (that is, change of the three-phase static coordinate system abc to two-phase synchronous rotating frame dq
Change, also referred to as rotation transformation), obtain output three-phase voltage UoabcDC component Uod、Uoq, inductance three-phase current ILabcDirect current point
Measure ILd、ILqWith output three-phase current IoabcDC component Iod、Ioq；Make to export three-phase current IoabcDC component Iod、IoqAccording to
Secondary cascade two trappers by being arranged in double-closed-loop control unit 200 obtain output three-phase current IoabcFiltering
Value Iodflt、Ioqflt。
Due to microgrid inverter under micro-capacitance sensor off-network state band nonlinear load when, microgrid inverter output electricity
There are harmonic components caused by nonlinear load in pressure and output electric current, and typical 5,7 order harmonic components are after rotation transformation
DC component in show as microgrid inverter output frequency 6 frequency multiplication AC compounents, 11,13 order harmonic components are rotating
12 frequency multiplication AC compounents of microgrid inverter output frequency are shown as in transformed DC component.Therefore, in order to eliminate 6 times
Frequency AC compounent and 12 frequency multiplication AC compounents are to the DC component I for exporting electric currentod、IoqInfluence, in a preferred embodiment
In, it is by the trapper Notch6 and centre frequency for 6 frequencys multiplication that cascade centre frequency is microgrid inverter output frequency
The trapper Notch12 of 12 frequencys multiplication of the output frequency of microgrid inverter, to filter out the AC compounent and 12 frequencys multiplication of 6 frequencys multiplication
AC compounent.
Specifically, the transmission function of trapper are as follows:
Here, s is Laplace operator, ωnFor the centre frequency of trapper, Q is the quality factor of trapper.Actually take
The Q is taken to be when valueωnFor 6 × ωoutOr 12 × ωout。ωoutFor virtual synchronous generator model functions combination (that is,
Control output frequency according to power regulation) output angular frequency.It is controlled due to using virtual synchronous generator model,
Has the function of primary frequency modulation, microgrid inverter output frequency can change with the size of active load, in order to guarantee to fall into
The accuracy of wave device centre frequency, the value of centre frequency need the output frequency of real-time tracking microgrid inverter.
Fig. 6 shows the schematic diagram of the determination active power of embodiment according to the present invention and the filter value of reactive power.
Referring to Fig. 6, in one example, the instantaneous active of microgrid inverter output can be calculated by instantaneous power theory
Power P1With instantaneous reactive power Q1:
P1=1.5 × (Uod×Iod+Uoq×Ioq),
Q1=1.5 × (Uoq×Iod-Uod×Ioq),
The instantaneous active power P calculated by above formula1With instantaneous reactive power Q1In microgrid inverter in micro-capacitance sensor
Under off-network state when band nonlinear load, it will appear harmonic component caused by nonlinear load, also so as to cause instantaneous active function
Rate P1With instantaneous reactive power Q1There is the AC compounent of the AC compounent of 6 frequencys multiplication and 12 frequencys multiplication, for virtual synchronous generator mould
The stability of real power control and idle control in type control makes the instantaneous active power calculated in a preferred embodiment
P1With instantaneous reactive power Q1Also successively by the trap for 6 frequencys multiplication that cascade centre frequency is microgrid inverter output frequency
Device and centre frequency are the trapper of 12 frequencys multiplication of microgrid inverter output frequency, then make the defeated of cascade two trappers
Pass through low-pass filter (LPF) out, obtains the filter value P of the active power of microgrid inverter outputoutWith the filtering of reactive power
Value Qout。
Fig. 7 shows the schematic diagram of the determination rotation angle degree of embodiment according to the present invention.
Referring to Fig. 7, the rotation angle, θ of Park transformation is the phase angle of the output voltage of microgrid inverter.
In a preferred embodiment, microgrid inverter is controlled based on virtual synchronous generator model, is revolved
Gyration θ can be generated by the functions combination of virtual synchronous generator model.
The primary frequency modulation control of virtual synchronous generator model adjusts equation by equation of rotor motion and prime mover and forms.
Equation of rotor motion are as follows:
Wherein, ωrefFor voltage rating angular frequency (that is, off-grid operation gives angular frequency), ωoutFor virtual synchronous generator
Output voltage angular frequency, PoutFor the filter value of the active power of microgrid inverter output, PmIt is virtual for virtual synchronous generator
Mechanical output is given, and J is virtual rotation inertia, and D is automatic virtual blocks coefficient, and θ is the rotation angle of Park transformation.
Prime mover adjusts equation are as follows:
Pm=Pref+Kp(ωref-ωout),
Wherein, PrefFor active power instruction, KpFor active difference coefficient.Virtual synchronous generator virtual machine power is given
Determine PmP is instructed by active powerrefIt is collectively constituted with virtual governor according to the regulation power that angular frequency deviation exports, by being distributed
Formula power supply and energy-storage units provide to simulate prime mover of synchronous machine.
Fig. 8 shows the signal of the voltage given value of the Voltage loop in the determination double-closed-loop control of embodiment according to the present invention
Figure.
Referring to Fig. 8, double-closed-loop control unit 200 determines the output voltage E of virtual synchronous generator modelref；According to output
Voltage Eref, virtual impedance ω LV、RVWith output three-phase current IoabcFilter value Iodflt、IoqfltDetermine the voltage of Voltage loop to
Definite value Uodref、Uoqref。
In one example, a Regulation Control of virtual synchronous generator model is the idle electricity for simulating synchronous generator
The relationship of hanging down is depressed to obtain the output voltage E of virtual synchronous generator modelref, shown in formula specific as follows:
Eref=Kq(Qref-Qout)+Uref,
Wherein, UrefFor the instruction of microgrid inverter output voltage, QrefFor reactive power instruction, QoutFor micro-capacitance sensor inversion
The filter value of the reactive power of device output, KqFor reactive difference adjustment coefficient.
Preferably, for the stabilization of multi-machine parallel connection operation, virtual impedance ω is increasedLv、Rv, therefore, in double-closed-loop control
Voltage loop voltage given value Uodref、UoqrefIt can be determined by following formula:
Preferably, in order to make microgrid inverter have the function of off-network black starting-up, microgrid inverter output electricity can be made
Pressure instruction UrefBy ramp function, and will be by the output U of ramp functionrampIt is added in the output of idle bias adjustment, in this way
It can be achieved zero and open boost function, so that the output voltage of microgrid inverter be made to be stepped up to given value from zero.
Fig. 9 shows the schematic diagram of the determination each harmonic voltage given value of embodiment according to the present invention.
Referring to Fig. 9, double-closed-loop control unit 200 carries out Park transformation to each harmonic voltage, and to the result of transformation into
Row moving average filter (MAF), to obtain the DC component U of each harmonic voltagedhnflt、Uqhnflt(h=5,7,11,13)；Meter
The inverse value for calculating the DC component of each harmonic voltage carries out proportional integration adjusting, and comparative example integral adjustment to inverse value
As a result the Ipark comprising angle compensation is carried out to convert (that is, change of the two-phase synchronous rotating frame dq to two-phase stationary coordinate system α β
Change), to obtain each harmonic voltage given value Ualfahref、Ubetahref。
In microgrid inverter band nonlinear load under micro-capacitance sensor off-network state, if pressed down without voltage harmonic
System, it will cause containing the odd harmonics such as 5,7,11,13 in the output voltage of microgrid inverter, so as to cause micro-capacitance sensor inversion
The percent harmonic distortion THD of the output voltage of device is exceeded, be unsatisfactory for sensitive loads power supply power quality requirement, therefore, it is necessary into
The inhibition of the odd harmonics such as row 5,7,11,13.
In a preferred embodiment, detection unit 100 detect microgrid inverter output voltage in 5,7,11,
13 subharmonic, using the method for more synchronous rotating frames by the output voltage of microgrid inverter through excessive synchronously rotating reference frame
Transformation, obtains the component U of each harmonic wave in the two-phase synchronous rotating coordinate systemdhn、Uqhn.Then, component Udhn、UqhnUsing cunning
Dynamic average filter obtains the DC component U of each harmonic voltagedhnflt、Uqhnflt。
In general balanced load application, 5,11 subharmonic show as negative sequence component, and 7,13 subharmonic show as positive sequence point
Amount has carried out the negative phase-sequence rotation that rotation angle is -5 × θ and -11 × θ and has sat for 5,11 times for this purpose, in a preferred embodiment
Mark transformation has carried out the positive sequence rotating coordinate transformation that rotation angle is 7 × θ and 13 × θ for 7,13 times, then will decomposite each time come
The DC component of harmonic wave is compared with 0, their difference carries out proportional integration adjusting, and the result of comparative example integral adjustment is included
The Ipark of angle compensation is converted, and obtains each harmonic voltage given value Ualfahref、Ubetahref, to inhibit microgrid inverter
Output voltage in harmonic wave.
It preferably, can should be h θ+△ h comprising the angle in the Ipark transformation of angle compensation.
Preferably, double-closed-loop control unit 200 includes digital controller.Digital controller passes through Digital Control side
Formula compensates harmonic wave caused by the delay introduced as the control instruction period.
Figure 10 shows the control schematic diagram of digital controller.
It should be appreciated that the characteristics of Digital Control is that control instruction updates once every certain period, control instruction
Update cycle is more than or equal to the sampling period of system, since at the time of current period has changed control instruction, arrives next week
Phase is changed before control instruction, and the control signal of system remains unchanged, and is not the variation of model- following control object and changes, this is just
It is another even more serious delay that digital controller introduces.
0, ω is inverter output voltage angular frequency referring to Fig.1.For digital controller, at least one sampling week is needed
The operation time of phase T, while the PWM output of inverter is also required to time of a T and establishes voltage.In this way, from voltage sample to
Control ring exports PWM and updates, and at least there is the delay time of a T.In delay time T, h subharmonic voltage is in this T time
△ θ is inside rotated through, is shown below:
Δ θ=h ω T=2h π fT
Here, f is the fundamental frequency of inverter output voltage.If do not compensated to this delay time, in Fig. 9
Coordinate transform be no longer identical transformation.When serious, the control of some higher hamonic wave even will form positive feedback, in this way by control
The output of ring processed, the subharmonic cannot not only be eliminated, but also can become increasing, control and fail so as to cause system.Thus
As it can be seen that the compensation of delay time is highly important in the control of voltage harmonic.The present embodiment is humorous at 5,7,11,13 times
When the proportional plus integral control output transform of wave is to two-phase stationary coordinate system, transformation angle is compensated, the angle of each secondary inverse transformation
Degree is h θ+△ h (h=5,7,11,13), and this method calculates simplicity, practical.
Figure 11 shows the schematic diagram of the voltage given value under the determination two-phase stationary coordinate system of embodiment according to the present invention,
Figure 12 shows the schematic diagram of the generation drive pulse signal of embodiment according to the present invention.
1 and Figure 12 referring to Fig.1, double-closed-loop control unit 200 is by voltage given value Uodref、UoqrefWith output three-phase voltage
UoabcDC component Uod、UoqSubtract each other, the result that proportional integration adjusts, and proportional integration is adjusted is executed to the result subtracted each other and is made
For the given value of current value I of electric current loopdref、Iqref；To given value of current value Idref、IqrefWith inductance three-phase current ILabcDC component
ILd、ILqDifference execute proportional integration adjust, by proportional integration adjust result and reactor generate voltage coupling terms ω LgPhase
Add, and Ipark transformation is carried out to the result of addition, to obtain the voltage given value U under two-phase stationary coordinate systemalfaref、
Ubetaref；By the voltage given value U under two-phase stationary coordinate systemalfaref、UbetarefBe added to each harmonic voltage given value
Ualfahref、Ubetahref, to obtain the total voltage given value PWM_ for space vector pulse width modulation (SVPWM) controlalfaref、
PWM_betaref.Drive pulse signal generates unit 300 according to total voltage given value PWM_alfaref、PWM_betarefAnd DC bus
Voltage UdcGenerate the drive pulse signal for controlling power device.
Figure 13 does not carry out micro-capacitance sensor when harmonics restraint in the case where showing existing microgrid inverter band nonlinear load
The experiment output waveform of inverter, Figure 14 show feelings of the microgrid inverter with nonlinear load of embodiment according to the present invention
The experiment output waveform of microgrid inverter when harmonics restraint is carried out under condition.
3 and Figure 14 referring to Fig.1, with a rated power for 210kW microgrid inverter under micro-capacitance sensor off-network state
For experiment with 90KW active power, 30kW reactive power and uncontrollable rectifier nonlinear load.It is inverse that Figure 13 shows micro-capacitance sensor
Become device and does not carry out the three line voltage waveforms exported in the case where harmonics restraint.The defeated of microgrid inverter is calculated by fft analysis
It is 3.5%, 11 subharmonic contents is 2.2%, 13 subharmonic that 5 subharmonic contents in voltage, which are 6.7%, 7 subharmonic contents, out
Content is 1.8%.Figure 14 shows microgrid inverter and carries out the three line voltage waveforms exported in the case where harmonics restraint.By
Fft analysis calculate 5 subharmonic contents in the output voltage of microgrid inverter be 0.23%, 7 subharmonic contents be 0.14%,
11 subharmonic contents are that 0.10%, 13 subharmonic contents are 0.08%, therefore, nonlinear load can be inhibited well to cause defeated
5,7,11,13 subharmonic in voltage out, improve the power quality of the output voltage of microgrid inverter.
The control method of the microgrid inverter of embodiment according to the present invention is described referring to Figure 15.
Figure 15 shows the flow chart of the control method of the microgrid inverter of embodiment according to the present invention.Here, micro- electricity
Net inverter includes power device, reactor and filter condenser.
In step S10 (that is, detecting step), detected under micro-capacitance sensor off-network state the output voltage of microgrid inverter with
And operating voltage and operating current.
In one embodiment of step S10, DC bus-bar voltage U is detected under micro-capacitance sensor off-network statedc, micro-capacitance sensor it is inverse
Become the output three-phase voltage U of deviceoabc, reactor inductance three-phase current ILabc, filter condenser capacitor three-phase current ICabc。
In step S20 (that is, double-closed-loop control step), each time in the output voltage of the microgrid inverter of detection is determined
Harmonic wave, the operating voltage and work of the microgrid inverter of each harmonic and detection of the output voltage based on microgrid inverter
Make electric current and executes double-closed-loop control.
In one embodiment of step S20, the output three-phase voltage U of detection is determinedoabcIn each harmonic, based on each
A odd harmonic and the inductance three-phase current I of detectionLabcWith capacitor three-phase current ICabcExecute double-closed-loop control.
It is preferably based on output three-phase voltage Uoabc, inductance three-phase current ILabcWith capacitor three-phase current ICabcDetermine double close
The voltage given value U of Voltage loop in ring controlodref、Uoqref；Determine output three-phase voltage UoabcEach harmonic voltage it is given
Value Ualfahref、Ubetahref；Based on voltage given value Uodref、UoqrefWith output three-phase voltage UoabcIt determines in double-closed-loop control
The given value of current value I of electric current loopdref、Iqref。
Further, by inductance three-phase current ILabcWith capacitor three-phase current ICabcIt is added, obtains the output three-phase of inverter
Electric current Ioabc；To output three-phase voltage Uoabc, inductance three-phase current ILabcWith output three-phase current IoabcPark change is carried out respectively
It changes, obtains output three-phase voltage UoabcDC component Uod、Uoq, inductance three-phase current ILabcDC component ILd、ILqAnd output
Three-phase current IoabcDC component Iod、Ioq；Make to export three-phase current IoabcDC component Iod、IoqIt passes sequentially through cascade
Two trappers obtain output three-phase current IoabcFilter value Iodflt、Ioqflt.Determine the output of virtual synchronous generator model
Voltage Eref；According to output voltage Eref, virtual impedance ω LV、RVWith output three-phase current IoabcFilter value Iodflt、IoqfltReally
The voltage given value U of constant voltage ringodref、Uoqref。
Here, the rotation angle of Park transformation is the angle generated by the functions combination of virtual synchronous generator model.
Here, the centre frequency of a trapper in two trappers is 6 times of the output frequency of inverter, another
The centre frequency of trapper is 12 times of the output frequency of inverter.
Further, Park transformation is carried out to each harmonic voltage, and moving average filter is carried out to the result of transformation, with
Obtain the DC component of each harmonic voltage；The inverse value for calculating the DC component of each harmonic voltage, compares inverse value
Example integral adjustment, and the result of comparative example integral adjustment carries out the Ipark comprising angle compensation and converts, to obtain each harmonic electricity
Press given value Ualfahref、Ubetahref。
Further, by voltage given value Uodref、UoqrefWith output three-phase voltage UoabcDC component Uod、UoqSubtract each other,
It executes proportional integration to the result subtracted each other to adjust, and the result that proportional integration is adjusted is as the given value of current value of electric current loop
Idref、Iqref；To given value of current value Idref、IqrefWith inductance three-phase current ILabcDC component ILd、ILqPoor execution ratio product
Divide and adjust, by the result that proportional integration is adjusted and the voltage coupling terms ω L that reactor 500 generatesgIt is added, and to the result of addition
Ipark transformation is carried out, to obtain the voltage given value U under two-phase stationary coordinate systemalfaref、Ubetaref；By two-phase stationary coordinate system
Under voltage given value Ualfaref、UbetarefBe added to each harmonic voltage given value Ualfahref、Ubetahref, to obtain for sky
Between Vector Pulse Width Modulation control total voltage given value PWM_alfaref、PWM_betaref。
In step S30 (that is, drive pulse signal generation step), generated according to the result of double-closed-loop control for controlling function
The drive pulse signal of rate device 400, so that microgrid inverter output loads consistent power with micro-capacitance sensor.
In one embodiment of step S30, according to the result of double-closed-loop control and DC bus-bar voltage UdcGeneration is used for
The drive pulse signal of power device 400 is controlled, so that microgrid inverter output loads consistent power with micro-capacitance sensor.
Preferably, step S30 is based on given value of current value Idref、Iqref, inductance three-phase current ILabc, capacitor three-phase current
ICabcWith DC bus-bar voltage UdcGenerate the drive pulse signal for controlling power device 400.
Further, step S30 is according to total voltage given value PWM_alfaref、PWM_betarefWith DC bus-bar voltage UdcIt produces
Give birth to the drive pulse signal for controlling power device 400.
Preferably, which is compensated by Digital Control mode and is caused by the delay that the control instruction period introduces
Harmonic wave.
In addition, the control device of the microgrid inverter of the embodiment of the present invention, control method and microgrid inverter,
The each harmonic of the output voltage of microgrid inverter based on detection executes double-closed-loop control, and based on including angle compensation
Ipark transformation carries out phase compensation to each harmonic, to inhibit the output electricity of microgrid inverter caused by nonlinear load
Each harmonic in pressure improves ability of the microgrid inverter with nonlinear load.In addition, passing through the outer of simulation synchronous generator
Characteristic makes the output of microgrid inverter have inertia and damping, and keeps output frequency insensitive to the fluctuation of load, thus
Improve the stability of microgrid inverter operation.
Moreover, it should be understood that each in the control device of microgrid inverter according to an exemplary embodiment of the present invention
Unit can be implemented hardware component and/or component software.Those skilled in the art place according to performed by each unit of restriction
Reason, can such as use site programmable gate array (FPGA) or specific integrated circuit (ASIC) Lai Shixian each unit.
Although being particularly shown and describing the present invention, those skilled in the art referring to its exemplary embodiment
It should be understood that in the case where not departing from the spirit and scope of the present invention defined by claim form can be carried out to it
With the various changes in details.
Claims (21)
1. a kind of control method of microgrid inverter, the microgrid inverter include power device, which is characterized in that described
Control method includes:
Detecting step: output voltage, operating voltage and the work of the microgrid inverter are detected under micro-capacitance sensor off-network state
Electric current；
Double-closed-loop control step: determining each harmonic in the output voltage of the microgrid inverter of detection, based on described
Each harmonic and the operating voltage and operating current of detection execute double-closed-loop control；
Drive pulse signal generates step: generating the driving arteries and veins for controlling the power device according to the result of double-closed-loop control
Signal is rushed, so that microgrid inverter output loads consistent power with micro-capacitance sensor.
2. control method as described in claim 1, which is characterized in that the microgrid inverter further includes reactor and filtering
Capacitor,
Wherein, detecting step further include: DC bus-bar voltage, the microgrid inverter are detected under the micro-capacitance sensor off-network state
Export the capacitor three-phase current of three-phase voltage, the inductance three-phase current of the reactor, the filter condenser；
Double-closed-loop control step further include: determine each harmonic in the output three-phase voltage of detection, be based on each odd times
The inductance three-phase current and the capacitor three-phase current of harmonic wave and detection execute double-closed-loop control；
Drive pulse signal generates step further include: is used for according to the result of double-closed-loop control and DC bus-bar voltage generation
The drive pulse signal of the power device is controlled, so that microgrid inverter output loads consistent function with micro-capacitance sensor
Rate.
3. control method as claimed in claim 2, which is characterized in that the double-closed-loop control step further include:
It is determined in double-closed-loop control based on the output three-phase voltage, the inductance three-phase current and the capacitor three-phase current
The voltage given value of Voltage loop；
Determine each harmonic voltage given value of the output three-phase voltage；
The given value of current value of the electric current loop in double-closed-loop control is determined based on the voltage given value and the output three-phase voltage,
Wherein, the drive pulse signal generates step further include:
It is produced based on the given value of current value, the inductance three-phase current, the capacitor three-phase current and the DC bus-bar voltage
Give birth to the drive pulse signal for controlling the power device.
4. control method as claimed in claim 3, which is characterized in that the double-closed-loop control step further include:
The inductance three-phase current is added with the capacitor three-phase current, obtains the output three-phase current of the inverter；
Park transformation is carried out to the output three-phase voltage, the inductance three-phase current and the output three-phase current respectively, is obtained
To the straight of the DC component of the output three-phase voltage, the DC component of the inductance three-phase current and the output three-phase current
Flow component；
So that the DC component of the output three-phase current is passed sequentially through cascade two trappers, obtains the output three-phase current
Filter value.
5. control method as claimed in claim 4, which is characterized in that the double-closed-loop control step further include:
Determine the output voltage of virtual synchronous generator model；
According to the output voltage, virtual impedance and the filter value for exporting three-phase current determine the voltage of the Voltage loop to
Definite value.
6. control method as claimed in claim 5, which is characterized in that the double-closed-loop control step further include:
Park transformation is carried out to each harmonic voltage, and moving average filter is carried out to the result of transformation, to obtain each time
The DC component of harmonic voltage；
The inverse value for calculating the DC component of each harmonic voltage carries out proportional integration adjusting, and comparative example to inverse value
The result of integral adjustment carries out the Ipark comprising angle compensation and converts, to obtain each harmonic voltage given value.
7. control method as claimed in claim 6, which is characterized in that the double-closed-loop control step further include:
The DC component of the voltage given value and the output three-phase voltage is subtracted each other, proportional integration is executed to the result subtracted each other
It adjusts, and the result that proportional integration is adjusted is as the given value of current value of the electric current loop；
It executes proportional integration to the difference of the DC component of the given value of current value and the inductance three-phase current to adjust, by ratio product
Divide the result adjusted to be added with the voltage coupling terms that the reactor generates, and Ipark transformation is carried out to the result of addition, with
Voltage given value under to two-phase stationary coordinate system；
Voltage given value under the two-phase stationary coordinate system is added to each harmonic voltage given value, to be used for
The total voltage given value of space vector pulse width modulation control,
Wherein, the drive pulse signal generates step further include:
The driving pulse for controlling the power device is generated according to the total voltage given value and the DC bus-bar voltage
Signal.
8. control method as claimed in claim 4, which is characterized in that
The rotation angle of the Park transformation is the angle generated by the functions combination of virtual synchronous generator model.
9. control method as claimed in claim 4, which is characterized in that
The centre frequency of a trapper in described two trappers is 6 times of the output frequency of the inverter, another
The centre frequency of trapper is 12 times of the output frequency of the inverter.
10. the control method as described in any one of claim 1-9, which is characterized in that the control method passes through number
Change control mode and compensates harmonic wave caused by the delay introduced as the control instruction period.
11. a kind of control device of microgrid inverter, the microgrid inverter include power device, which is characterized in that institute
Stating control device includes:
Detection unit is configured as detecting the output voltage of the microgrid inverter, work electricity under micro-capacitance sensor off-network state
Pressure and operating current；
Double-closed-loop control unit, each harmonic being configured to determine that in the output voltage of the microgrid inverter are based on institute
The operating voltage and operating current for stating the microgrid inverter of each harmonic and detection unit detection execute double close
Ring control；
Drive pulse signal generates unit, generates the driving arteries and veins for controlling the power device according to the result of double-closed-loop control
Signal is rushed, so that microgrid inverter output loads consistent power with micro-capacitance sensor.
12. control device as claimed in claim 11, which is characterized in that the microgrid inverter further includes reactor and filter
Wave capacitor,
Wherein, the detection unit is additionally configured to detect DC bus-bar voltage, the micro-capacitance sensor under micro-capacitance sensor off-network state
The capacitor three-phase current for exporting three-phase voltage, the inductance three-phase current of the reactor, the filter condenser of inverter；
The double-closed-loop control unit is additionally configured to each in the output three-phase voltage for determining the detection unit detection
Subharmonic, the inductance three-phase current detected based on each odd harmonic and the detection unit and the capacitor three-phase electricity
Stream executes double-closed-loop control；
Drive pulse signal generates unit and is additionally configured to be generated according to the result of double-closed-loop control and the DC bus-bar voltage
For controlling the drive pulse signal of the power device, so that microgrid inverter output and micro-capacitance sensor load are consistent
Power.
13. control device as claimed in claim 12, which is characterized in that the double-closed-loop control unit is also configured to
It is determined in double-closed-loop control based on the output three-phase voltage, the inductance three-phase current and the capacitor three-phase current
The voltage given value of Voltage loop；
Determine each harmonic voltage given value of the output three-phase voltage；
The given value of current value of the electric current loop in double-closed-loop control is determined based on the voltage given value and the output three-phase voltage,
Wherein, the drive pulse signal generates unit and is also configured to
It is produced based on the given value of current value, the inductance three-phase current, the capacitor three-phase current and the DC bus-bar voltage
Give birth to the drive pulse signal for controlling the power device.
14. control device as claimed in claim 13, which is characterized in that the double-closed-loop control unit is also configured to
The inductance three-phase current is added with the capacitor three-phase current, obtains the output three-phase current of the inverter；
Park transformation is carried out to the output three-phase voltage, the inductance three-phase current and the output three-phase current respectively, is obtained
To the straight of the DC component of the output three-phase voltage, the DC component of the inductance three-phase current and the output three-phase current
Flow component；
The DC component of the output three-phase current is set to pass sequentially through cascade two be arranged in the double-closed-loop control unit
A trapper obtains the filter value of the output three-phase current.
15. control device as claimed in claim 14, which is characterized in that the double-closed-loop control unit is also configured to
Determine the output voltage of virtual synchronous generator model；
According to the output voltage, virtual impedance and the filter value for exporting three-phase current determine the voltage of the Voltage loop to
Definite value.
16. control device as claimed in claim 15, which is characterized in that the double-closed-loop control unit is also configured to
Park transformation is carried out to each harmonic voltage, and moving average filter is carried out to the result of transformation, to obtain each time
The DC component of harmonic voltage；
The inverse value for calculating the DC component of each harmonic voltage carries out proportional integration adjusting, and comparative example to inverse value
The result of integral adjustment carries out the Ipark comprising angle compensation and converts, to obtain each harmonic voltage given value.
17. control device as claimed in claim 16, which is characterized in that the double-closed-loop control unit is also configured to
The DC component of the voltage given value and the output three-phase voltage is subtracted each other, proportional integration is executed to the result subtracted each other
It adjusts, and the result that proportional integration is adjusted is as the given value of current value of the electric current loop；
It executes proportional integration to the difference of the DC component of the given value of current value and the inductance three-phase current to adjust, by ratio product
Divide the result adjusted to be added with the voltage coupling terms that the reactor generates, and Ipark transformation is carried out to the result of addition, with
Voltage given value under to two-phase stationary coordinate system；
Voltage given value under the two-phase stationary coordinate system is added to each harmonic voltage given value, to be used for
The total voltage given value of space vector pulse width modulation control,
Wherein, the drive pulse signal generates unit and is also configured to
The driving pulse for controlling the power device is generated according to the total voltage given value and the DC bus-bar voltage
Signal.
18. control device as claimed in claim 14, which is characterized in that
The rotation angle of the Park transformation is the angle generated by the functions combination of virtual synchronous generator model.
19. control device as claimed in claim 14, which is characterized in that
The centre frequency of a trapper in described two trappers is 6 times of the output frequency of the inverter, another
The centre frequency of trapper is 12 times of the output frequency of the inverter.
20. the control device as described in any one of claim 11-19, which is characterized in that the double-closed-loop control unit
Including digital controller,
Wherein, the digital controller is compensated by Digital Control mode and is caused by the delay that the control instruction period introduces
Harmonic wave.
21. a kind of includes the microgrid inverter of the control device as described in any one of claim 11-19.
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