CN105391326A - A method and device for controlling a DC component of photovoltaic inversion - Google Patents
A method and device for controlling a DC component of photovoltaic inversion Download PDFInfo
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- CN105391326A CN105391326A CN201510975421.0A CN201510975421A CN105391326A CN 105391326 A CN105391326 A CN 105391326A CN 201510975421 A CN201510975421 A CN 201510975421A CN 105391326 A CN105391326 A CN 105391326A
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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
-
- 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
- H02M7/4803—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 with means for reducing DC component from AC output voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a method and device for controlling a DC component of photovoltaic inversion, and relates to a photovoltaic inverter power generation system. The method includes: collecting three-phase output currents of the inverter; obtaining DC components of the three-phase output currents; and performing inhibiting control on an output signal according to the obtained DC components of the three-phase output currents. The DC components of the system are obtained after sampling the output currents and calculating average values, and the DC components are subjected to PI control and voltage modulation, thereby achieving real-time accurate DC component adjustment.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter electricity generation system, be specifically related to a kind of control method and device of DC component of photovoltaic inversion.
Background technology
In recent years, because theCourse of PV Industry is rapid, in supply of electric power, role highlights gradually, increasing distributed photovoltaic power generation system access is in power distribution network, new challenge is proposed to traditional distribution network, also the current quality that the inverter of parallel network power generation exports is had higher requirement simultaneously.
Wherein in output current, the content of DC component is the important inspection target exporting the quality of power supply, because DC component can cause adverse effect to the transformer in power distribution network, residual current device, current mode transformer, measuring instrument etc.Owing to having magnetic core in these equipment, the existence of DC component easily causes the saturated of magnetic circuit, causes residual current device misoperation, transformer or instrument transformer is saturated, heating, produce harmonic wave and noise etc., cause the operation troubles of whole system even to be paralysed.In GB GB/Z19964-2005 " photo-voltaic power generation station access power system technology regulation ", regulation DC component content should not exceed 1% of its interchange rated value; Specify in IEEEStd.929-2000, in photovoltaic generating system grid-connected current, DC component content must be less than 0.5% of system nominal current; Individual countries safety (G83 as Britain) requires more strict, and DC component content is less than 0.25% of system nominal current.
Therefore, one of the key technical problem be suppressed in order to grid-connected photovoltaic system of DC component, the method suppressed for DC component at present mainly contains following several: 1, use isolating transformer isolation, the method reduces inverter conversion efficiency, cost is high, and volume is large.2, use electric capacity every directly, capacitance, under the frequency of utility grid, can present low impedance state, and the too small meeting of capacitance causes first-harmonic pressure drop excessive, and capacitance crosses conference makes system dynamic response excessively slow, while also can improve inverter cost.3, detect FEEDBACK CONTROL, the DC component exported by the method detection computations system of hardware or software, adjustment reference current realizes current compensation.Hardware approach is used equally also to be unfavorable for cost control, also there is many defects in current software detection control method, the real-time of system feedback compensation is poor on the one hand, there is hysteresis quality in control, the computational methods of another aspect system dc component are not enough and counting accuracy is inadequate, make actual unsatisfactory to the inhibition of DC component.
Summary of the invention
The present invention, in order to solve the problem, proposes a kind of control method and device of DC component of photovoltaic inversion, can meet again the requirement that system suppresses DC component real-time by accurate detection system output DC component.
In order to realize foregoing invention object, the technical scheme that the present invention takes is as follows:
A control method for the DC component of photovoltaic inversion, comprising:
Gather the three-phase output current of inverter;
Obtain the DC component of described three-phase output current;
According to the DC component of the described three-phase output current obtained, inhibitory control is carried out to output signal.
Preferably, the three-phase output current gathering inverter comprises:
Instantaneous sampling is carried out to the output current of inverter and obtains instantaneous three-phase current sampled value;
Carry out correction to current sampling data described in each phase to arrange, obtain three-phase output current.
Preferably, the DC component obtaining described three-phase output current comprises:
Sliding average is asked for output current described in each phase and obtains three-phase dc component.
Preferably, the DC component of the described described three-phase output current according to obtaining, inhibitory control is carried out to output signal and comprises:
Coordinate Conversion is carried out to the described three-phase dc component obtained, obtains the DC component of the static rectangular coordinate system of two-phase;
Desired value control is carried out to the DC component of the static rectangular coordinate system of described two-phase.
Preferably, carry out correction setting to current sampling data described in each phase to comprise:
The described current sampling data of each phase is deducted the mean value of described three-phase current sampled value.
Preferably, ask for sliding average acquisition three-phase dc component to output current described in each phase to comprise:
Output current described in each phase is asked for the mean value in single civil power cycle;
The mean value in described civil power cycle is asked for the mean value in preset time period.
Preferably, carry out desired value to the DC component of the static rectangular coordinate system of described two-phase to control to comprise:
The DC component of static for described two-phase rectangular coordinate system is controlled in the ratio of deviation and/or integration, is converted to and meets pre-conditioned desired value.
For solving the problems of the technologies described above, the present invention also provides a kind of control device of DC component of photovoltaic inversion, comprising:
Acquisition module, for gathering the three-phase output current of inverter;
DC Module, for obtaining the DC component of described three-phase output current;
Suppression module, for the DC component according to the described three-phase output current obtained, carries out inhibitory control to output signal.
Preferably, the three-phase output current of described acquisition module collection inverter comprises:
Instantaneous sampling is carried out to the output current of inverter and obtains instantaneous three-phase current sampled value;
Carry out correction to current sampling data described in each phase to arrange, obtain three-phase output current.
Preferably, the DC component that described DC Module obtains described three-phase output current comprises:
Sliding average is asked for output current described in each phase and obtains three-phase dc component.
Preferably, described suppression module, according to the DC component of the described three-phase output current obtained, is carried out inhibitory control to output signal and is comprised:
Coordinate Conversion is carried out to the described three-phase dc component obtained, obtains the DC component of the static rectangular coordinate system of two-phase;
Desired value control is carried out to the DC component of the static rectangular coordinate system of described two-phase.
Preferably, carry out correction setting to current sampling data described in each phase to comprise:
The described current sampling data of each phase is deducted the mean value of described three-phase current sampled value.
Preferably, described acquisition module is asked for sliding average to output current described in each phase and is obtained three-phase dc component and comprise:
Output current described in each phase is asked for the mean value in single civil power cycle;
The mean value in described civil power cycle is asked for the mean value in preset time period.
Preferably, the DC component of described suppression module to the static rectangular coordinate system of described two-phase carry out desired value control comprise:
The DC component of static for described two-phase rectangular coordinate system is controlled in the ratio of deviation and/or integration, is converted to and meets pre-conditioned desired value.
Compared to the prior art the present invention, has following beneficial effect:
Technical scheme of the present invention is passed through directly at the static rectangular coordinate α of two-phase, β axle controls, namely to the DC component obtaining system after output current sampling calculating mean value, after doing clark conversion again, DC quantity is to α, β axle can be added to after PI controls finally enter SVPWM (SpaceVectorPulseWidthModulation, space vector pulse width modulation) modulation voltage on, realize the adjustment of in real time accurate DC component.
Accompanying drawing explanation
Fig. 1 is the control block diagram of the DC component of the photovoltaic inversion of the embodiment of the present invention;
Fig. 2 is the flow chart of the control method of the DC component of the photovoltaic inversion of the embodiment of the present invention;
Fig. 3 is the structural representation of the control device of the DC component of the photovoltaic inversion of the embodiment of the present invention.
Embodiment
Clearly understand for making goal of the invention of the present invention, technical scheme and beneficial effect, below in conjunction with accompanying drawing, embodiments of the invention are described, it should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
As depicted in figs. 1 and 2, the embodiment of the present invention provides a kind of control method of DC component of photovoltaic inversion, comprising:
The three-phase output current of S1, collection inverter;
S2, obtain the DC component of described three-phase output current;
S3, according to the DC component of described three-phase output current obtained, inhibitory control is carried out to output signal.
The three-phase output current that step S1 gathers inverter comprises:
S101, instantaneous sampling is carried out to the output current of inverter obtain instantaneous three-phase current sampled value;
S102, current sampling data described in each phase carried out to correction and arrange, obtain three-phase output current.
Step S102 carries out correction to current sampling data described in each phase and arranges and specifically comprise:
The described current sampling data of each phase is deducted the mean value of described three-phase current sampled value.
The DC component that step S2 obtains described three-phase output current comprises:
S201, output current described in each phase asked for sliding average and obtain three-phase dc component.
Step S201 asks for sliding average acquisition three-phase dc component to output current described in each phase and specifically comprises:
Output current described in each phase is asked for the mean value in single civil power cycle;
The mean value in described civil power cycle is asked for the mean value in preset time period.
Step S3, according to the DC component of the described three-phase output current obtained, carries out inhibitory control to output signal and comprises:
S301, Coordinate Conversion is carried out to the described three-phase dc component obtained, obtain the DC component of two-phase static rectangular coordinate system;
S302, desired value control is carried out to the DC component of the static rectangular coordinate system of described two-phase.
The DC component of step S302 to the static rectangular coordinate system of described two-phase is carried out desired value and is controlled specifically to comprise:
The DC component of static for described two-phase rectangular coordinate system is controlled in the ratio of deviation and/or integration, is converted to and meets pre-conditioned desired value.
As shown in Figure 3, the embodiment of the present invention also provides a kind of control device of DC component of photovoltaic inversion, comprising:
Acquisition module, for gathering the three-phase output current of inverter;
DC Module, for obtaining the DC component of described three-phase output current;
Suppression module, for the DC component according to the described three-phase output current obtained, carries out inhibitory control to output signal.
The three-phase output current that described acquisition module gathers inverter comprises:
Instantaneous sampling is carried out to the output current of inverter and obtains instantaneous three-phase current sampled value;
Carry out correction to current sampling data described in each phase to arrange, obtain three-phase output current.
The DC component that described DC Module obtains described three-phase output current comprises:
Sliding average is asked for output current described in each phase and obtains three-phase dc component.
Described suppression module, according to the DC component of the described three-phase output current obtained, is carried out inhibitory control to output signal and is comprised:
Coordinate Conversion is carried out to the described three-phase dc component obtained, obtains the DC component of the static rectangular coordinate system of two-phase;
Desired value control is carried out to the DC component of the static rectangular coordinate system of described two-phase.
Carry out correction setting to current sampling data described in each phase to comprise:
The described current sampling data of each phase is deducted the mean value of described three-phase current sampled value.
Described acquisition module is asked for sliding average acquisition three-phase dc component to output current described in each phase and is comprised:
Output current described in each phase is asked for the mean value in single civil power cycle;
The mean value in described civil power cycle is asked for the mean value in preset time period.
The DC component of described suppression module to the static rectangular coordinate system of described two-phase is carried out desired value and is controlled to comprise:
The DC component of static for described two-phase rectangular coordinate system is controlled in the ratio of deviation and/or integration, is converted to and meets pre-conditioned desired value.
Embodiment 1
The control method of the DC component of the photovoltaic inversion that the embodiment of the present invention provides is as follows:
To the output current instantaneous sampling of inverter;
Carry out correction to each phase current sampling value in real time to arrange, the current sampling data of each phase deducts the mean value of three-phase sum, this ensure that three-phase sum is zero.Its mathematical expression is:
To reduce due to the drift of Hall temperature, drift, due to ADC (Analog/DigitalConverter, analog to digital conversion) the precision difference of sampling itself, the instantaneous sampling value sum of the three-phase output current in switch periods can be caused and non-vanishing, the output current mean value that software can be caused to calculate will not mate with actual DC component, finally brings mistuning to save; Three-phase output current after correction overcomes the problems referred to above.
The mean value asking for the single civil power cycle to the output current after correcting asks for a sliding average in 500 milliseconds again, the direct current biasing exported with further reaction system.Like this can really reaction system export direct current biasing, further, with 16K switching frequency, 50Hz civil power is example, and its expression formula is:
Deviation and fluctuation is there is to reduce the direct current component value following the trail of the single computation of Period that may cause due to BUS (DC bus) voltage ripple of system and MPP (MaximumPowerPoint, maximum power point).
According to the information of the direct current component value obtained, carry out the inhibitory control of DC component:
Directly at α, β axle controls, namely to the DC component obtained, do clark conversion and (DC component is carried out coordinate transform to α by abc three-phase, β axle) after, DC component can control (output current or voltage controlled in the ratio (P) of deviation and/or integration (I), control to and meet pre-conditioned desired value) to α, β axle and export to be added to afterwards and finally enter the modulation voltage V of SVPWM through PI
α, V
βon, realize the adjustment of accurate DC component in real time.
As Fig. 1, in such scheme, if the DC component I that will calculate
i-Mavgbe applied on the feedback current of Systematical control, middle meeting is through computings such as clark, park, PI control and anti-park conversion, and this can be quick to what control, real-time, and precision has a negative impact.
Although disclosed execution mode as above, the execution mode that its content just adopts for the ease of understanding technical scheme of the present invention, is not intended to limit the present invention.Technical staff in any the technical field of the invention; under the prerequisite not departing from disclosed core technology scheme; any amendment and change can be made in the form implemented and details; but the protection range that the present invention limits, the scope that still must limit with appending claims is as the criterion.
Claims (14)
1. a control method for the DC component of photovoltaic inversion, is characterized in that, comprising:
Gather the three-phase output current of inverter;
Obtain the DC component of described three-phase output current;
According to the DC component of the described three-phase output current obtained, inhibitory control is carried out to output signal.
2. the method for claim 1, is characterized in that: the three-phase output current gathering inverter comprises:
Instantaneous sampling is carried out to the output current of inverter and obtains instantaneous three-phase current sampled value;
Carry out correction to current sampling data described in each phase to arrange, obtain three-phase output current.
3. method as claimed in claim 2, is characterized in that: the DC component obtaining described three-phase output current comprises:
Sliding average is asked for output current described in each phase and obtains three-phase dc component.
4. the method for claim 1, is characterized in that: the DC component of the described described three-phase output current according to obtaining, and carries out inhibitory control comprise output signal:
Coordinate Conversion is carried out to the described three-phase dc component obtained, obtains the DC component of the static rectangular coordinate system of two-phase;
Desired value control is carried out to the DC component of the static rectangular coordinate system of described two-phase.
5. method as claimed in claim 2, is characterized in that, carry out correction setting comprise current sampling data described in each phase:
The described current sampling data of each phase is deducted the mean value of described three-phase current sampled value.
6. method as claimed in claim 3, is characterized in that, asks for sliding average acquisition three-phase dc component comprise output current described in each phase:
Output current described in each phase is asked for the mean value in single civil power cycle;
The mean value in described civil power cycle is asked for the mean value in preset time period.
7. method as claimed in claim 4, is characterized in that: carry out desired value to the DC component of the static rectangular coordinate system of described two-phase and control to comprise:
The DC component of static for described two-phase rectangular coordinate system is controlled in the ratio of deviation and/or integration, is converted to and meets pre-conditioned desired value.
8. a control device for the DC component of photovoltaic inversion, is characterized in that, comprising:
Acquisition module, for gathering the three-phase output current of inverter;
DC Module, for obtaining the DC component of described three-phase output current;
Suppression module, for the DC component according to the described three-phase output current obtained, carries out inhibitory control to output signal.
9. device as claimed in claim 8, is characterized in that: the three-phase output current that described acquisition module gathers inverter comprises:
Instantaneous sampling is carried out to the output current of inverter and obtains instantaneous three-phase current sampled value;
Carry out correction to current sampling data described in each phase to arrange, obtain three-phase output current.
10. device as claimed in claim 9, is characterized in that: the DC component that described DC Module obtains described three-phase output current comprises:
Sliding average is asked for output current described in each phase and obtains three-phase dc component.
11. devices as claimed in claim 8, is characterized in that: described suppression module, according to the DC component of the described three-phase output current obtained, is carried out inhibitory control to output signal and comprised:
Coordinate Conversion is carried out to the described three-phase dc component obtained, obtains the DC component of the static rectangular coordinate system of two-phase;
Desired value control is carried out to the DC component of the static rectangular coordinate system of described two-phase.
12. devices as claimed in claim 9, is characterized in that, carry out correction setting comprise current sampling data described in each phase:
The described current sampling data of each phase is deducted the mean value of described three-phase current sampled value.
13. devices as claimed in claim 12, is characterized in that, described acquisition module is asked for sliding average acquisition three-phase dc component to output current described in each phase and comprised:
Output current described in each phase is asked for the mean value in single civil power cycle;
The mean value in described civil power cycle is asked for the mean value in preset time period.
14. devices as claimed in claim 11, is characterized in that: the DC component of described suppression module to the static rectangular coordinate system of described two-phase is carried out desired value and controlled to comprise:
The DC component of static for described two-phase rectangular coordinate system is controlled in the ratio of deviation and/or integration, is converted to and meets pre-conditioned desired value.
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Cited By (1)
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