CN103872683A - Compensation device used for eliminating second harmonic pulsation in inverter and electrical power system - Google Patents
Compensation device used for eliminating second harmonic pulsation in inverter and electrical power system Download PDFInfo
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- CN103872683A CN103872683A CN201210553644.4A CN201210553644A CN103872683A CN 103872683 A CN103872683 A CN 103872683A CN 201210553644 A CN201210553644 A CN 201210553644A CN 103872683 A CN103872683 A CN 103872683A
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Abstract
The invention relates to a compensation device used for eliminating second harmonic pulsation in an inverter and an electrical power system using the device. The compensation device comprises an electrical energy storer, a controller and an electrical energy transformer, wherein the electrical energy storer is used for storing electrical energy; the controller is used for generating a control signal, used for eliminating the second harmonic pulsation in the inverter, according to the actual voltage and the actual current of the alternating current side of the inverter and the actual voltage and the actual current of the electrical energy storer; the electrical energy transformer is used for extracting a part of direct current electrical energy input into the inverter to the electrical energy storer or outputting the electrical energy stored in the electrical energy storer to the inverter according to the control signal so as to eliminate the second harmonic pulsation. By utilizing a compensation device and inverter system, the second harmonic pulsation in the inverter can be eliminated.
Description
Technical field
The present invention relates to power domain, relate in particular to electric power system and compensation arrangement.
Background technology
In recent years, distributed power generation market development is swift and violent, one of photovoltaic grid-connected important directions that becomes this field development of large Capacity Optical.The control strategy of conventional photovoltaic inverter is based on designing under grid balance condition, therefore, in the time that fall such as three-phase imbalance or laod unbalance etc. causes three phase network uneven, electrical network will inevitably produce second-harmonic power, thereby there is second harmonic pulsation in the DC side that causes inverter, further cause grid-connected current wave distortion, badly influence and network electric energy quality, cause invertor operation hydraulic performance decline.
Chinese patent application CN101540510A proposes a kind of compensation scheme of photovoltaic DC-to-AC converter DC voltage fluctuation, and it is the DC(direct current with high frequency transformer for utilization)/AC(exchange) link be incorporated to single-phase electrical network photovoltaic parallel in system propose.This patent application is by adding DC voltage ripple compensating module to realize the compensation to input direct-current side secondary pulsating voltage in DC/AC high frequency link control module, thereby the grid-connected current harmonic wave that elimination causes due to DC voltage ripple improves grid-connected current quality.
Chinese patent application CN102148584A proposes one and is applied to the single-phase converter system of two-stage, be particularly useful for eliminating in the two-stage grid-connected converter system of middle low power of similar grid-connected photovoltaic system the method that the pulsation of intermediate dc side secondary is disturbed, it is to limit for rear class DC/AC single-phase PWM current transformer self topological structure, inevitably exist the pulsation of power secondary to propose in intermediate dc side, by adding Second-harmonic compensation module to the counter-bonification in addition of pulsing of the second harmonic of middle DC link in the DC/DC of prime link control module, thereby eliminating secondary pulsation disturbs and stable middle dc voltage.
Two schemes set forth above is all to eliminate the second harmonic pulsation for the inverter of single-phase electrical network by improving control strategy, need carry out software, hardware change to original device.
But the restriction for the inverter of three phase network due to himself topological structure, only improves its control strategy and can not eliminate second harmonic pulsation, thereby can not guarantee the constant and grid-connected current balance of DC voltage.
Summary of the invention
Consider the above problem of prior art, the embodiment of the present invention afford redress device and electric power system, it can eliminate second harmonic pulsation in inverter.
According to a kind of compensation arrangement of pulsing for eliminating inverter second harmonic of the embodiment of the present invention, comprising: energy storage, for storage of electrical energy; Controller, for according to the power of the second harmonic pulsation of the AC of inverter and virtual voltage and the actual current of described energy storage, produces the control signal of the second harmonic pulsation for eliminating described inverter; And, electrical energy transformer, for according to described control signal, the part power extraction that is input to described inverter to described energy storage or at least part of electric energy of storing in described energy storage is exported to described inverter, is pulsed with the described second harmonic of eliminating described inverter.
In a kind of specific implementation, described controller comprises: the first power computation module, for according to the virtual voltage of the AC of described inverter and actual current, calculate the power of described second harmonic pulsation; The first Current calculation module, for according to calculated power and the virtual voltage of described energy storage, calculates the first electric current that described second harmonic pulsation needs described energy storage to provide is provided; And current control module, for according to the first electric current of described calculating and the actual current of described energy storage, generates described control signal.
In a kind of specific implementation, described current control module comprises: the first difference between current computing module, for calculating the difference between current of the first electric current of described calculating and the actual current of described energy storage; The first modulating wave generation module, for the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the first electric current of the above calculating; And pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described control signal.
In another kind of specific implementation, described control signal is also for stablizing the power output of described inverter, described controller also comprises: the second power computation module, for according to the virtual voltage of described inverter direct-flow side and actual current, calculate the actual input power of described inverter direct-flow side; The 3rd power computation module, for according to the target output of described actual input power and described inverter, calculates the power that makes described actual input power reach described target output and to need increase; And, the second Current calculation module, be used for according to the described power of increase and the virtual voltage of described energy storage of needing, calculating reaches described needs the power increasing and the second electric current that needs described energy storage to provide, wherein, described current control module is further used for, according to the actual current of described the first electric current, described the second electric current and described energy storage, generating described control signal.Thereby, not only can eliminate the second harmonic pulsation of inverter, and can stablize the power output of inverter.
In another kind of specific implementation, described current control module comprises: the first difference between current computing module, for calculating the difference between current of actual current of described the first electric current and described the second electric current sum and described energy storage; The first modulating wave generation module, for according to the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the above first electric current and described the second electric current sum; And pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described control signal.
In a kind of specific implementation, described electrical energy transformer is that bidirectional, dc/DC converter and described energy storage are direct current memories, or described electrical energy transformer is that bidirectional, dc/AC converter and described energy storage are alternating current memories.
In a kind of specific implementation, compensation arrangement is independent of inverter to be realized, thereby does not need original system to carry out any software and hardware change, can be independent of original system work, and can provide support to original system.
According to a kind of electric power system of the embodiment of the present invention, comprising: inverter; And, compensation arrangement, wherein, described compensation arrangement comprises: energy storage, for storage of electrical energy; The first controller, for according to the power of the second harmonic pulsation of the AC of described inverter and virtual voltage and the actual current of described energy storage, produces the first control signal of the second harmonic pulsation for eliminating described inverter; And, electrical energy transformer, for according to described the first control signal, the part power extraction that is input to described inverter to described energy storage or the electric energy of storing in described energy storage is exported to described inverter, is pulsed with the described second harmonic of eliminating in described inverter.
In a kind of specific implementation, described the first controller comprises: the first power computation module, for according to the virtual voltage of the AC of described inverter and actual current, calculate the power of described second harmonic pulsation; The first Current calculation module, for according to calculated power and the virtual voltage of described energy storage, calculates the first electric current that needs described energy storage to provide in order to eliminate described second harmonic pulsation; And the first current control module, for according to the first electric current of described generation and the actual current of described energy storage, generates described the first control signal.
In a kind of specific implementation, described the first current control module comprises: the first difference between current computing module, for calculating the difference between current of the first electric current of described calculating and the actual current of described energy storage; The first modulating wave generation module, for the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the first electric current of the above calculating; And pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described control signal.
In another kind of specific implementation, described the first control signal is also for stablizing the power output of described inverter, described the first controller also comprises: the second power computation module, for according to the virtual voltage of described inverter direct-flow side and actual current, calculate the actual input power of described inverter direct-flow side; The 3rd power computation module, for according to the target output of described actual input power and described inverter, calculates the power that makes described actual input power reach described target output and to need increase; And, the second Current calculation module, be used for according to the described power of increase and the virtual voltage of described energy storage of needing, generate in order to reach described and need the power increasing and the second electric current that needs described energy storage to provide, wherein, described the first current control module is further used for, according to the actual current of described the first electric current and described the second electric current sum and described energy storage, generating described the first control signal.
In another kind of specific implementation, described the first current control module comprises: the first difference between current computing module, for calculating the difference between current of actual current of described the first electric current and described the second electric current sum and described energy storage; The first modulating wave generation module, for according to the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the above first electric current and described the second electric current sum; And pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described the first control signal.
In a kind of specific implementation, described inverter comprises: circuit module, for according to the second control signal, by the converting direct-current power into alternating-current power that the is input to described inverter line output of going forward side by side; And, second controller, be used for generating described the second control signal, wherein, described second controller comprises: voltage control module, for according to the virtual voltage of described inverter direct-flow side and target voltage, calculate and make the virtual voltage of described inverter direct-flow side follow the tracks of the above target voltage and the active current of needs; And the second current control module, for according to the actual current of the AC of the phase angle of target reactive current, described electrical network, described active current and described inverter, generates described the second control signal.
In a kind of specific implementation, described electrical energy transformer is that two-way DC-DC converter and described energy storage are direct current memories, or described electrical energy transformer is that bidirectional, dc-AC converter and described energy storage are alternating current memories.
Can find out from description above, the present embodiment uses independently compensation arrangement to pulse by the second harmonic absorbing inverter from the DC side Extraction parts electric energy of inverter or to the DC side output electric energy of inverter, thereby can eliminate the second harmonic pulsation in inverter, the DC voltage that guarantees inverter is constant, thereby guarantees the quality of the ac-side current of inverter.
Accompanying drawing explanation
Other feature of the present invention, feature, advantage and benefit will become more apparent by the detailed description below in conjunction with accompanying drawing.Wherein:
Fig. 1 shows according to the schematic diagram of the electric power system of one embodiment of the invention;
Fig. 2 shows according to the schematic diagram of the controller of the inverter of first embodiment of the invention;
Fig. 3 A shows according to the schematic diagram of the controller of the compensation arrangement of first embodiment of the invention; And
Fig. 3 B shows according to the schematic diagram of the controller of the compensation arrangement of second embodiment of the invention.
Embodiment
Describe each embodiment of the present invention in detail in connection with accompanying drawing below.
Referring now to Fig. 1,, it shows according to the schematic diagram of the electric power system of one embodiment of the invention.As shown in Figure 1, the compensation arrangement 300 that electric power system 100 comprises inverter 200 and pulses for eliminating the second harmonic of inverter 200.
Wherein, inverter 200 comprises controller 220 and main circuit (circuit module) 260.Wherein, controller 220, according to the actual current of the AC of the virtual voltage of inverter 200 DC side and target voltage and inverter 200, generates and exports control signal.The control signal that main circuit 260 is exported according to controller 220, the direct current that solar energy photovoltaic panel 400 is input to inverter 200 is converted to three-phase alternating current and exports to electrical network 500.Wherein, main circuit 260 at least comprises filter capacitor and DC/AC converter.
Compensation arrangement 300 comprises energy storage 310, controller 340 and electrical energy transformer 370.Energy storage 310 is for storage of electrical energy, and it can be Support Capacitor or such energy storage devices such as battery pack, ultracapacitor or flywheel accumulator.Controller 340, according to the power of the second harmonic pulsation of the AC of inverter 200 and virtual voltage and the actual current of energy storage 310, produces the control signal of the second harmonic pulsation for eliminating inverter 200.The control signal that electrical energy transformer 370 produces according to controller 340, utilizes energy storage 310 to absorb the second harmonic pulsation in inverter 200.Particularly, the control signal of electrical energy transformer 370 for producing according to controller 340, the part power extraction that is input to inverter 200 is stored to energy storage 310 or at least part of electric energy of storage in energy storage 310 is exported to inverter 200, to eliminate the second harmonic pulsation in inverter 200.Here, electrical energy transformer 370 can be DC/DC converter or DC/AC converter, wherein, in the time that electrical energy transformer 370 is DC/DC converter, energy storage 310 is direct current memories, and, in the time that electrical energy transformer 370 is DC/AC converter, energy storage 310 is alternating current memories.
Can find out from description above, the present embodiment uses independently compensation arrangement 300 to pulse by the second harmonic absorbing inverter 200 from the DC side Extraction parts electric energy of inverter 200 or to the DC side output electric energy of inverter 200, thereby can eliminate the second harmonic pulsation in inverter 200.And, to say from overall hardware configuration, compensation arrangement 300 is independent of inverter 200, does not need that existing inverter 200 is carried out to any software and hardware and changes, and can apply above-mentioned compensation arrangement.
Referring now to Fig. 2,, it shows according to the schematic diagram of the controller of the inverter of first embodiment of the invention.
As shown in Figure 2, controller 220 can comprise voltage control module and current control module, wherein, this voltage control module calculates according to the virtual voltage of inverter 200 DC side and target voltage the upper required active current of target voltage of virtual voltage tracking that makes inverter 200 DC side.This current control module, according to the actual current of the AC of the phase angle of target reactive current, electrical network 500, the active current of calculating and inverter 200, generates control signal.Wherein, voltage control module comprises voltage difference computing module 2202 and Current calculation module 2204, and this current control module comprises Current calculation module 2206, difference between current computing module 2208, current regulator 2210 and pulse-width modulation (PWM) module 2212.
Wherein, voltage difference computing module 2202 calculates the target voltage v of solar photovoltaic panel PV
pvref(being the target voltage of inverter 200 DC side) and virtual voltage v
pvthe voltage difference of (being the virtual voltage of inverter 200 DC side).Here, the target voltage of inverter 200 DC side is to preset the voltage that will reach.
The voltage difference that Current calculation module 2204 is calculated according to voltage difference computing module 2202, proportion of utilization integration (PI) algorithm, proportional integral derivative (PID) algorithm or other suitable algorithm calculate the actual voltage value v that makes inverter 200 DC side
pvthe target voltage v of inverter 200 DC side in tracking
pvrefactive current Id.
Current calculation module 2206 utilizes the phase angle theta of target reactive current Iq, electrical network 500 and active current Id that Current calculation module 2204 is calculated to calculate the target current { i of the three-phase electricity of the AC of inverter 200
gref.Here { i,
grefrepresent the each set of the target current of electricity mutually in the three-phase electricity of AC of inverter 200.
Difference between current computing module 2208 calculates the target current { i of the three-phase electricity of the AC of inverter 200
grefand actual current { i
gdifference, obtain the difference between current { ε of the three-phase electricity of the AC of inverter 200
ig.Here { i,
grepresent the each set of the actual current of electricity mutually in the three-phase electricity of AC of inverter 200, { ε
igrepresent each target current of electricity mutually in the three-phase electricity of AC of inverter 200 and the set of the difference of actual current.
The modulating wave M of pulse width modulation module 2212 for generating according to current regulator 2208
pvinv, generate pulse-width signal, as the control signal for controlling main circuit 260.
Referring now to Fig. 3 A,, it shows according to the schematic diagram of the controller of the compensation arrangement of first embodiment of the invention.
As shown in Figure 3A, controller 340 comprises power computation module 3402, Current calculation module 3404, difference between current computing module 3406, current regulator 3408 and PWM module 3410.Wherein, difference between current computing module 3406, current regulator 3408 and PWM module 3410 form current control module.
Wherein, power computation module 3402 is for utilizing the virtual voltage { v of three-phase electricity of AC of inverter 200
gand actual current { i
g, calculate the power P of the second harmonic pulsation in inverter 200
2.P
2computing formula as follows:
P
2=(A
1-A
1’)sin(ωt)·B
1sin(ωt+θ
1)+(A
2-A
2’)sin(ωt)·B
2sin(ωt+θ
2)+(A
3-A
3’)sin(ωt)·B
3sin(ωt+θ
3)
Wherein, A
1, A
2and A
3represent that respectively Voltage unbalance (comprising that voltage falls and rises) voltage magnitude before, A are not occurring for first-phase electricity, second-phase electricity and third phase electricity in the three-phase electricity of AC of inverter 200
1' A
2' and A
3' represent respectively first-phase electricity, second-phase electricity and third phase electricity in the three-phase electricity of AC of the inverter 200 virtual voltage amplitude after there is Voltage unbalance, B
1sin (ω t+ θ
1), B
2sin (ω t+ θ
2) and B
3sin (ω t+ θ
3) represent respectively first-phase electricity, second-phase electricity and third phase electricity in the three-phase electricity of AC of inverter 200 actual current after there is Voltage unbalance, wherein, { v
g}={ A
1' sin (ω t), A
2' sin (ω t), A
3' sin (ω is t) }, { i
g}={ B
1sin (ω t+ θ
1), B
2sin (ω t+ θ
2), B
3sin (ω t+ θ
3).ω is electrical network angular speed, and t is the time, and θ is initial angle, in general θ 1 θ
2θ
3mutual deviation 120 is spent.
Current calculation module 3404 is used the power P of calculated second harmonic pulsation
2virtual voltage { v with energy storage 310
s, calculate for this second harmonic electric current { i that needs energy storage 310 to provide of pulsing is provided
s2ref.Here, in the time that energy storage 310 is direct current memory, { v
sand { i
s2refall scalar, { i
s2ref}=P
2/ { v
s.In the time that energy storage 310 is alternating current memory, { v
sand { i
s2refall vector, can utilize equation P
2={ v
s{ i
s2refcalculate { i
s2ref, wherein represent vectorial point multiplication operation.
Difference between current computing module 3406 calculates electric current { i
s2refwith the actual current { i of energy storage 310
sdifference between current { ε
is, its expression makes the actual current { i of energy storage 310
sreach electric current { i
s2refand need.
The modulating wave Msconv that pulse width modulation module 3410 generates according to current regulator 3408, generates pulse-width signal, as the control signal for eliminating second harmonic pulsation.
Referring now to Fig. 3 B,, it shows according to the schematic diagram of the controller of the compensation arrangement of second embodiment of the invention.Adopt the controller 340 of realizing according to mode shown in Fig. 3 B, not only can eliminate the second harmonic pulsation of inverter 200, and can occur stablizing fluctuation at the direct current of input inverter 200 DC side the power output of inverter 200.For simplicity, only describe the difference of the second embodiment and first embodiment of controller 340 below, both repeat no more something in common.
As shown in Figure 3 B, controller 340 also comprises Current calculation module 3412, power computation module 3414 and difference power computing module 3416.Wherein, power computation module 3414 is by the virtual voltage v of photovoltaic panel PV
pv(being the virtual voltage of inverter 200 DC side) and actual current i
pv(being the actual current of inverter 200 DC side) multiplies each other, and calculates the actual input power P of inverter 200 DC side
in.
Difference power computing module 3416 calculates the target output P of inverter 200
refactual input power P with inverter 200 DC side
indifference power, it represents to reach target output P for the actual input power that makes inverter 200 DC side
refand the power P that needs energy storage 310 to provide
stref.Here the target output P of inverter 200,
refcan be for example the power that grid company, dispatching of power netwoks department or power grid control require inverter 200 to export to electrical network 500.
Current calculation module 3412 is utilized power P
strefremove the virtual voltage { v with energy storage 310
s, calculate the power output in order to stablize inverter 200 and electric current { the i that needs energy storage 310 to provide
stref.Here, in the time that energy storage 310 is direct current memory, { v
sand { i
strefall scalar, { i
stref}=P
stref/ { v
s.In the time that energy storage 310 is alternating current memory, { v
sand { i
strefall vector, can utilize equation P
stref={ v
s{ i
strefcalculate { i
s2ref, wherein represent vectorial point multiplication operation.
Difference between current computing module 3406 as computing module for second harmonic in order the to eliminate inverter 200 electric current { i that needs energy storage 310 to provide of pulsing is provided
s2refand the electric current { i that needs energy storage 310 to provide in order to stablize the power output of inverter 200
strefactual current { the i of sum and energy storage 310
sdifference between current { ε
is.
It will be appreciated by those skilled in the art that controller 220 of the present invention is except can realizing according to the mode shown in Fig. 2, can also realize according to other any suitable method.
It will be appreciated by those skilled in the art that the disclosed controller 220 and 340 of each embodiment can utilize software, hardware (such as integrated circuit, field programmable gate array (FPGA) etc.) or the mode of software and hardware combining to realize above.
It will be appreciated by those skilled in the art that disclosed scheme is not only applicable to provide electric energy (grid-connected) to electrical network 500 above, is to be also applicable to directly provide electric energy to load.
It will be appreciated by those skilled in the art that the disclosed scheme of each embodiment of the present invention not only can be applied to the inverter of output three-phase alternating current, and can be applied to the inverter of output single-phase alternating current, two-phase alternating current or the above alternating current of three-phase.
Those skilled in the art are to be understood that, the direct current that the disclosed scheme of each embodiment of the present invention is not only applicable to that solar energy photovoltaic panel is produced is converted to the inverter of alternating current, and is applicable to an alternate manner (for example wind power generation) direct current producing and is converted to the inverter of alternating current.
It will be appreciated by those skilled in the art that disclosed each embodiment can make various changes and distortion in the situation that departing from invention essence above, therefore, protection scope of the present invention should be limited by appending claims.
Claims (14)
1. for eliminating a compensation arrangement for inverter second harmonic pulsation, comprising:
Energy storage, for storage of electrical energy;
Controller, for according to the power of the second harmonic pulsation of the AC of inverter and virtual voltage and the actual current of described energy storage, generates the control signal of the second harmonic pulsation for eliminating described inverter; And
Electrical energy transformer, be used for according to described control signal, the part power extraction that is input to described inverter, to described energy storage or at least part of electric energy of storing in described energy storage is exported to described inverter, is pulsed with the second harmonic of eliminating described inverter.
2. compensation arrangement as claimed in claim 1, wherein, described controller comprises:
The first power computation module, for according to the virtual voltage of the AC of described inverter and actual current, calculates the power of described second harmonic pulsation;
The first Current calculation module, for according to calculated power and the virtual voltage of described energy storage, calculates the first electric current that described second harmonic pulsation needs described energy storage to provide is provided; And
Current control module, for according to the first electric current of described calculating and the actual current of described energy storage, generates described control signal.
3. compensation arrangement as claimed in claim 2, wherein, described current control module comprises:
The first difference between current computing module, for calculating the difference between current of the first electric current of described calculating and the actual current of described energy storage;
The first modulating wave generation module, for according to the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the first electric current of the above calculating; And
Pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described control signal.
4. compensation arrangement as claimed in claim 2, wherein,
Described control signal is also for stablizing the power output of described inverter,
Described controller also comprises:
The second power computation module, for according to the virtual voltage of described inverter direct-flow side and actual current, calculates the actual input power of the DC side of described inverter;
The 3rd power computation module, for according to the target output of described actual input power and described inverter, calculates the power that makes described actual input power reach described target output and to need increase; And
The second Current calculation module, for according to the described power of increase and the virtual voltage of described energy storage of needing, calculates and reaches described the second electric current that needs the power of increase and need described energy storage to provide,
Wherein, described current control module is further used for, according to the actual current of described the first electric current, described the second electric current and described energy storage, generating described control signal.
5. compensation arrangement as claimed in claim 4, wherein, described current control module comprises:
The first difference between current computing module, for calculating the difference between current of actual current of described the first electric current and described the second electric current sum and described energy storage;
The first modulating wave generation module, for according to the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the above first electric current and described the second electric current sum; And
Pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described control signal.
6. the compensation arrangement as described in any one in claim 1-5, wherein,
Described electrical energy transformer is that bidirectional, dc/DC converter and described energy storage are direct current memories, or
Described electrical energy transformer is that bidirectional, dc/AC converter and described energy storage are alternating current memories.
7. the compensation arrangement as described in any one in claim 1-5, wherein, described compensation arrangement is independent of described inverter to be realized.
8. an electric power system, comprising:
Inverter; And
Compensation arrangement,
Wherein, described compensation arrangement comprises:
Energy storage, for storage of electrical energy;
The first controller, for according to the power of the second harmonic pulsation of the AC of described inverter and virtual voltage and the actual current of described energy storage, generates the first control signal of the second harmonic pulsation for eliminating described inverter; And
Electrical energy transformer, be used for according to described the first control signal, the part power extraction that is input to described inverter, to described energy storage or at least part of electric energy of storing in described energy storage is exported to described inverter, is pulsed with the second harmonic of eliminating in described inverter.
9. electric power system as claimed in claim 8, wherein, described the first controller comprises:
The first power computation module, for according to the virtual voltage of the AC of described inverter and actual current, calculates the power of described second harmonic pulsation;
The first Current calculation module, for according to calculated power and the virtual voltage of described energy storage, calculates the first electric current that described second harmonic pulsation needs described energy storage to provide is provided; And
The first current control module, for according to the first electric current of described generation and the actual current of described energy storage, generates described the first control signal.
10. electric power system as claimed in claim 9, wherein, described the first current control module comprises:
The first difference between current computing module, for calculating the difference between current of actual current of described the first electric current and described energy storage;
The first modulating wave generation module, for according to the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the above the first electric current; And
Pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described control signal.
11. electric power systems as claimed in claim 9, wherein,
Described the first control signal is also for stablizing the power output of described inverter,
Described the first controller also comprises:
The second power computation module, for according to the virtual voltage of described inverter direct-flow side and actual current, calculates the actual input power of described inverter direct-flow side;
The 3rd power computation module, for according to the target output of described actual input power and described inverter, calculates the power that makes described actual input power reach described target output and to need increase; And
The second Current calculation module, for according to the described power of increase and the virtual voltage of described energy storage of needing, generates in order to reach described and needs the power increasing and the second electric current that needs described energy storage to provide,
Wherein, described the first current control module is further used for, according to the actual current of described the first electric current, described the second electric current and described energy storage, generating described the first control signal.
12. electric power systems as claimed in claim 11, wherein, described the first current control module comprises:
The first difference between current computing module, for calculating the difference between current of actual current of described the first electric current and described the second electric current sum and described energy storage;
The first modulating wave generation module, for according to the difference between current of described calculating, generates for making the actual current of described energy storage follow the tracks of the modulating wave of the above first electric current and described the second electric current sum; And
Pulse width modulation module, for according to the modulating wave of described generation, generates pulse-width signal, as described the first control signal.
13. electric power systems as described in any one in claim 8-12, wherein, described inverter comprises:
Circuit module, for according to the second control signal, by the converting direct-current power into alternating-current power that the is input to described inverter line output of going forward side by side; And
Second controller, for generating described the second control signal,
Wherein, described second controller comprises:
Voltage control module, for according to the virtual voltage of described inverter direct-flow side and target voltage, calculates and makes the virtual voltage of described inverter direct-flow side follow the tracks of the above target voltage and the active current of needs; And
The second current control module, for according to the actual current of the AC of the phase angle of target reactive current, described electrical network, described active current and described inverter, generates described the second control signal.
14. electric power systems as described in any one in claim 8-12, wherein,
Described electrical energy transformer is that two-way DC-DC converter and described energy storage are direct current memories, or
Described electrical energy transformer is that bidirectional, dc-AC converter and described energy storage are alternating current memories.
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| CN111869069A (en) * | 2018-01-15 | 2020-10-30 | 金斯顿女王大学 | Power-controlled capacitor circuit and control method thereof |
| CN110445383A (en) * | 2018-05-02 | 2019-11-12 | 阳光电源股份有限公司 | A kind of two-stage type single-phase converter control method and control device |
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