CN102074965B - Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system - Google Patents
Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system Download PDFInfo
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Abstract
The invention discloses a device and a method for reactive power compensation and harmonic suppression of a grid-connected potovoltaic system. The method comprises the following steps of: directly acquiring current on a harmonic source, decomposing the acquired current into harmonic current, fundamental current, reactive current and active current through Fourier transformation, doing a summation on the harmonic current requiring compensation and the reactive current to obtain compensating current, comparing the compensating current with command current, utilizing PWM (pulse width modulation) tracking control method to output PWM waveforms according to the comparison results and driving the PWM waveforms to first control the state of every switching tube in an inversion unit and then control the current output by the inversion unit. Therefore, current on a load can track the command current in a sawtooth wave form, the harmonic current and the reactive current can be offset and the purposes of harmonic suppression and reactive power compensation are achieved. The device and the method can be realized on the basis of the traditional grid-connected potovoltaic system, and the device has a simple structure, carries out detection and control in a real-time manner and has fast responding current.
Description
Technical field
The present invention relates to photovoltaic power generation technology field, the device and method that particularly a kind of reactive power compensation of photovoltaic parallel in system and harmonic wave suppress.
Background technology
Along with becoming increasingly conspicuous of energy scarcity problem in global range, the utilization of regenerative resource particularly solar energy power generating comprehensive utilization has caused attention widely.
Existing photovoltaic power generation grid-connecting technology only offers electric network active electric energy, and the direct current energy inversion that is about to photovoltaic array is that AC energy is fed to electrical network, and guarantees that it has higher power factor.And the reactive energy of load is generally provided by electrical network, along with applying of photovoltaic power generation technology, realize reactive power compensation and harmonic wave inhibition technology in photovoltaic power generation grid-connecting inversion process, the grid-connected needs that can adapt to better electric power system, simultaneously for alleviating electrical network burden, to improve power supply quality significant.
At present, one of key technology that photovoltaic parallel in system reactive power compensation and harmonic wave suppress is the detection of reactive current and harmonic current.Introduce several current sample methods of the prior art below.
, there is comparatively serious phase shift and frequency drift problem, and cannot directly isolate the first-harmonic real component in distortion current in the direct filter method that adopts fixed-frequency filter;
Adopt the integration separation method of definite integral computing, although detect more effectively, be difficult to the needed integrator of structure;
Employing is based on neuronic adaptive harmonic current detection method, although circuit structure is simple, rapid dynamic response speed, accuracy of detection are high, it is not a kind of method of routine, and practical application also needs to do further further investigation.
In sum, all there is certain shortcoming in the method that detects at present reactive current and harmonic current, and therefore how accurately compensation reactive current and harmonic current are the problems that those skilled in the art need to solve fast.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of reactive power compensation of photovoltaic parallel in system and the device and method that harmonic wave suppresses, and accurately fast detecting reactive current and harmonic current, realize reactive power compensation and harmonic wave and suppress.
The invention provides a kind of reactive power compensation of photovoltaic parallel in system and the device that harmonic wave suppresses, comprising: current acquisition module, Current Decomposition module, offset current obtain module, current comparing module, PWM waveform generation module and current drives module;
Described current acquisition module, for gathering the electric current of filtering isolated location output, and sends to Current Decomposition module by the electric current collecting;
Described Current Decomposition module, for utilizing the electric current collecting Fourier transform formula to be decomposed into fundamental current component, harmonic current components, reactive current component and active current;
Described offset current obtains module, for described harmonic current components and described reactive current component are added to acquisition offset current;
Described current comparing module, for predefined instruction current and described offset current are compared, the input signal using comparative result as described PWM waveform generation module;
Described PWM waveform generation module, for according to the comparative result output PWM waveform of input, wherein,, described PWM waveform generation module is specially hysteresis comparator, and ring width represents with H, and instruction current represents with I1, and offset current represents with I2:
When I1-I2=H, the output signal of PWM waveform generation module remains unchanged;
When I1-I2 >=H, the output signal of PWM waveform generation module will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes high level from low level, make the PWM waveform of controlling bottom right brachium pontis switching tube become low level from high level;
When I1-I2≤H, the output signal of PWM waveform generation module will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes low level from high level, make the PWM waveform of controlling bottom right brachium pontis switching tube become high level from low level;
Described current drives module, for exporting to each switching tube of inversion unit after PWM waveform is driven, to control the state of described each switching tube, so that instruction current described in the current tracking of described filtering isolated location output.
Preferably, also comprise the low-pass filtering module being connected between Current Decomposition module and offset current acquisition module;
Described low-pass filtering module, carries out separatedly for fundamental current component, harmonic current components, active current and the reactive current component that Current Decomposition decomposition module is gone out, send to offset current to obtain module harmonic current components and reactive current component.
Preferably, described filtering isolated location comprises inductance, transformer and electric capacity;
Described inductance is connected between the output of described inversion unit and the former limit winding of transformer;
The two ends described electric capacity in parallel of the secondary winding of transformer;
The two ends of described electric capacity are as the output of filtering isolated location.
Preferably, described current acquisition module is specially Hall element, and described Hall element is for gathering the electric current of described electric capacity output.
Preferably, also comprise voltage detection module and voltage protection module;
Described voltage detection module, for gathering the voltage of inversion unit direct-flow input end;
Described voltage protection module, when the voltage of described voltage detection module detection surpasses preset range, sends locking signal, to cut off the input of inversion unit DC side.
The present invention also provides a kind of reactive power compensation of photovoltaic parallel in system and the method that harmonic wave suppresses, and comprising:
Gather the electric current of filtering isolated location output;
The electric current of collection is decomposed into fundamental current component, harmonic current components, reactive current component and active current through Fourier transform formula;
Described harmonic current components and reactive current component are added to acquisition offset current;
Predefined instruction current and offset current are compared;
Comparative result output PWM waveform according to described instruction current and offset current, is specially: utilize hysteresis comparator to realize, wherein, the ring width of described hysteresis comparator represents with H, and instruction current represents with I1, and offset current represents with I2:
When I1-I2=H, the output signal of hysteresis comparator remains unchanged;
When I1-I2 >=H, the output signal of hysteresis comparator will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes high level from low level, make the PWM waveform of controlling bottom right brachium pontis switching tube become low level from high level;
When I1-I2≤H, the output signal of hysteresis comparator will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes low level from high level, make the PWM waveform of controlling bottom right brachium pontis switching tube become high level from low level;
Described PWM waveform is driven to the state of each switching tube in rear control inversion unit, so that instruction current described in the current tracking of described filtering isolated location output.
Preferably, after the electric current of collection is decomposed into fundamental current component, harmonic current components, reactive current component and active current through Fourier transform formula, also comprise:
By low pass filter, the fundamental current component decompositing, harmonic current components, active current and reactive current component are carried out separated.
Preferably, gather the electric current of filtering isolated location output, be specially: adopt Hall element to gather the electric current of filtering isolated location output.
Compared with prior art, the present invention has the following advantages:
The device and method that the reactive power compensation of photovoltaic parallel in system provided by the invention and harmonic wave suppress, directly gather the electric current on harmonic source (load), utilize Fourier transform that the Current Decomposition of collection is gone out to harmonic current, fundamental current, reactive current and active current, the harmonic current of needs compensation and reactive current are added, obtain offset current, by offset current and instruction current comparison, according to comparative result, utilize PWM tracking and controlling method output PWM waveform, PWM waveform is controlled the state of each switching tube in inversion unit after overdriving, and then the electric current of control inversion unit output, thereby make electric current in load with sawtooth waveforms shape trace command electric current, thereby offset harmonic current and reactive current, reach the object of harmonic wave inhibition and reactive power compensation.The present invention utilizes existing photovoltaic parallel in system just can realize, simple in structure, and real-time measure and control, and current response is very fast.
Accompanying drawing explanation
Fig. 1 is photovoltaic parallel in system structure chart of the prior art;
Fig. 2 is device embodiment mono-structure chart that reactive power compensation provided by the invention and harmonic wave suppress;
Fig. 3 is the another example structure figure of device that reactive power compensation provided by the invention and harmonic wave suppress;
Fig. 4 is embodiment of the method one flow chart that reactive power compensation provided by the invention and harmonic wave suppress;
Fig. 5 is embodiment of the method two flow charts that reactive power compensation provided by the invention and harmonic wave suppress.
Embodiment
For those skilled in the art being understood better and implementing technical scheme of the present invention, introduce the environment-photovoltaic parallel in system of technical solution of the present invention application below, referring to Fig. 1, this figure is photovoltaic parallel in system structure chart of the prior art.
The direct current that photovoltaic cell 101 sends, by boosting unit 102, become a direct voltage that voltage is adjustable, this direct voltage enters inversion unit 104 after current limliting unit 103 current limlitings, inversion unit 104 is alternating voltage by direct voltage inversion, alternating voltage more after filtering isolated location 105 complete grid-connected function, simultaneously for load circuit 106 provides alternating current.
Filtering isolated location 105 in photovoltaic parallel in system of the present invention is realized by APF.
The present invention is based on Active Power Filter-APF (APF, Active Power Filter) and realize reactive power compensation and the harmonic wave inhibition of whole system.
First introduce APF below, APF is a kind of for dynamically suppressing the power electronic equipment of harmonic wave, compensating reactive power, and harmonic wave and the idle of variation that can all change big or small and frequency compensate; It has realized dynamic tracking compensation, and not only compensation harmonic but also compensating reactive power.
The present invention is considered as the DC side of inversion unit the DC voltage side of APF,
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Referring to Fig. 2, this figure is the structure chart that reactive power compensation provided by the invention and harmonic wave suppress.
The device that the reactive power compensation of the photovoltaic parallel in system that the present embodiment provides and harmonic wave suppress comprises: current acquisition module 201, Current Decomposition module 202, offset current obtain module 203, current comparing module 204, PWM waveform generation module 205 and current drives module 206;
Current acquisition module 201, for gathering the electric current of filtering isolated location output, and sends to Current Decomposition module by the electric current collecting;
Current Decomposition module 202, for utilizing the electric current collecting Fourier transform formula to be decomposed into fundamental current component, harmonic current components, reactive current component and active current;
Offset current obtains module 203, for harmonic current components and reactive current component are added to acquisition offset current;
Current comparing module 204, for instruction current and offset current are compared, the input signal using comparative result as PWM waveform generation module;
PWM waveform generation module 205, for exporting PWM waveform according to the comparative result of input;
Current drives module 206, for exporting to each switching tube of inversion unit after PWM waveform is driven, the state of control switch pipe, so that the current tracking instruction current of filtering isolated location output.
The device that the reactive power compensation of photovoltaic parallel in system provided by the invention and harmonic wave suppress, directly gather the electric current on harmonic source (load), utilize Fourier transform that the Current Decomposition of collection is gone out to harmonic current, fundamental current, reactive current and active current, the harmonic current of needs compensation and reactive current are added, obtain offset current, by offset current and instruction current comparison, according to comparative result, utilize PWM tracking and controlling method output PWM waveform, PWM waveform is controlled the state of each switching tube in inversion unit after overdriving, and then the electric current of control inversion unit output, thereby make electric current in load with sawtooth waveforms shape trace command electric current, thereby offset harmonic current and reactive current, reach the object of harmonic wave inhibition and reactive power compensation.The present invention utilizes existing photovoltaic parallel in system just can realize, simple in structure, and real-time measure and control, and current response is very fast.
Referring to Fig. 3, this figure is the another example structure figure of device provided by the invention.
PWM waveform generation module in the present embodiment is specially hysteresis comparator 302, and the ring width of described hysteresis comparator 302 represents with H, and described instruction current represents with I1, and described offset current represents with I2; ?
When I1-I2=H, the output signal of hysteresis comparator 302 remains unchanged;
When I1-I2 >=H, the output signal of hysteresis comparator 302 will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes high level from low level, make the PWM waveform of controlling bottom right brachium pontis switching tube become low level from high level;
When I1-I2≤H, the output signal of hysteresis comparator 302 will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes low level from high level, make the PWM waveform of controlling bottom right brachium pontis switching tube become high level from low level.
The device that the present embodiment provides also comprises the low-pass filtering module 301 being connected between Current Decomposition module 202 and offset current acquisition module 203;
Described low-pass filtering module 301, fundamental current component, harmonic current components, active current and the reactive current component that is used for that Current Decomposition decomposition module is gone out carries out separated, sends to offset current to obtain module harmonic current components and reactive current component.
Filtering isolated location in the present embodiment is APF, comprises inductance L 1, transformer T and capacitor C 3;
Described inductance L 1 is connected between the output of inversion unit and the former limit winding of transformer T;
Inversion unit in the present embodiment is full-bridge inverting, comprises as shown in the figure four switching tubes, upper left brachium pontis switching tube Q1, lower-left brachium pontis switching tube Q2, upper right brachium pontis switching tube Q3 and bottom right brachium pontis switching tube Q4.
The two ends described capacitor C 3 in parallel of the secondary winding of transformer T;
The two ends of described capacitor C 3 are as the output of APF.
Described current acquisition module is specially Hall element HL7, and as shown in the figure, described Hall element HL7, for gathering the electric current of described capacitor C 3 outputs, gathers the electric current in load.
The device that the present embodiment provides also comprises voltage detection module and voltage protection module;
Described voltage detection module, for gathering the voltage of inversion unit direct-flow input end;
Described voltage protection module, when the voltage of described voltage detection module detection surpasses preset range, sends locking signal, to cut off the input of inversion unit DC side.
The device that reactive power compensation based on above-mentioned a kind of photovoltaic parallel in system and harmonic wave suppress, the present invention also provides a kind of reactive power compensation of photovoltaic parallel in system and the method that harmonic wave suppresses, and below in conjunction with specific embodiment, describes its part in detail.
Referring to Fig. 4, this figure is embodiment of the method one flow chart provided by the invention.
The method that the reactive power compensation of photovoltaic parallel in system provided by the invention and harmonic wave suppress, comprising:
S401: the electric current that gathers the output of filtering isolated location;
S402: the electric current of collection is decomposed into fundamental current component, harmonic current components, reactive current component and active current through Fourier transform formula;
S403: described harmonic current components and reactive current component are added to acquisition offset current;
S404: predefined instruction current and offset current are compared;
S405: according to the comparative result output PWM waveform of described instruction current and offset current;
S406: described PWM waveform is driven to the state of each switching tube in rear control inversion unit, so that instruction current described in the current tracking of described filtering isolated location output.
Inversion unit in the present embodiment is full-bridge inverting, comprises four switching tubes, upper left brachium pontis switching tube, lower-left brachium pontis switching tube, upper right brachium pontis switching tube and bottom right brachium pontis switching tube.
The method that the reactive power compensation of photovoltaic parallel in system provided by the invention and harmonic wave suppress, directly gather the electric current on harmonic source (load), utilize Fourier transform that the Current Decomposition of collection is gone out to harmonic current, fundamental current, reactive current and active current, the harmonic current of needs compensation and reactive current are added, obtain offset current, by offset current and instruction current comparison, according to comparative result, utilize PWM tracking and controlling method output PWM waveform, PWM waveform is controlled the state of each switching tube in inversion unit after overdriving, and then the electric current of control inversion unit output, thereby make electric current in load with sawtooth waveforms shape trace command electric current, thereby offset harmonic current and reactive current, reach the object of harmonic wave inhibition and reactive power compensation.The present invention utilizes existing photovoltaic parallel in system just can realize, simple in structure, and real-time measure and control, and current response is very fast.
Method provided by the invention adopts hysteresis comparator to realize the output of PWM waveform, input signal using instruction current and offset current as hysteresis comparator, the ring width of described hysteresis comparator represents with H, and described instruction current represents with I1, and described offset current represents with I2; ?
When I1-I2=H, the output signal of hysteresis comparator remains unchanged;
When I1-I2 >=H, the output signal of hysteresis comparator will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes high level from low level, make the PWM waveform of controlling bottom right brachium pontis switching tube become low level from high level;
When I1-I2≤H, the output signal of hysteresis comparator will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes low level from high level, make the PWM waveform of controlling bottom right brachium pontis switching tube become high level from low level.
Referring to Fig. 5, this figure is embodiment of the method two flow charts provided by the invention.
S501: adopt Hall element to measure the electric current of filtering isolated location output;
S502 is identical with S402, does not repeat them here.
S503: the fundamental current component decompositing, harmonic current components, active current and reactive current component are carried out separated by low pass filter.
S504-S507 is identical with S403-S406 respectively, does not repeat them here.
The method that this enforcement provides also comprises the voltage that gathers inversion unit direct-flow input end; When the voltage of described voltage detection module detection surpasses preset range, send locking signal, to cut off the input of inversion unit DC side.The effect of this step is overvoltage and under-voltage protection, there is no sequencing relation with each step in Fig. 5, and this step runs through whole control procedure.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (8)
1. the device that the reactive power compensation of photovoltaic parallel in system and harmonic wave suppress, is characterized in that, comprising: current acquisition module, Current Decomposition module, offset current obtain module, current comparing module, PWM waveform generation module and current drives module;
Described current acquisition module, for gathering the electric current of filtering isolated location output, and sends to Current Decomposition module by the electric current collecting;
Described Current Decomposition module, for utilizing the electric current collecting Fourier transform formula to be decomposed into fundamental current component, harmonic current components, reactive current component and active current;
Described offset current obtains module, for described harmonic current components and described reactive current component are added to acquisition offset current;
Described current comparing module, for predefined instruction current and described offset current are compared, the input signal using comparative result as described PWM waveform generation module;
Described PWM waveform generation module, for according to the comparative result output PWM waveform of input, wherein, described PWM waveform generation module is specially hysteresis comparator, and ring width represents with H, and instruction current represents with I1, and offset current represents with I2:
When I1-I2=H, the output signal of PWM waveform generation module remains unchanged;
When I1-I2 >=H, the output signal of PWM waveform generation module will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes high level from low level, make the PWM waveform of controlling bottom right brachium pontis switching tube become low level from high level;
When I1-I2≤H, the output signal of PWM waveform generation module will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes low level from high level, make the PWM waveform of controlling bottom right brachium pontis switching tube become high level from low level;
Described current drives module, for exporting to each switching tube of inversion unit after PWM waveform is driven, to control the state of described each switching tube, so that instruction current described in the current tracking of described filtering isolated location output.
2. the device that the reactive power compensation of photovoltaic parallel in system and harmonic wave suppress according to claim 1, is characterized in that, also comprises the low-pass filtering module being connected between Current Decomposition module and offset current acquisition module;
Described low-pass filtering module, carries out separatedly for fundamental current component, harmonic current components, active current and the reactive current component that Current Decomposition decomposition module is gone out, send to offset current to obtain module harmonic current components and reactive current component.
3. the device that the reactive power compensation of photovoltaic parallel in system and harmonic wave suppress according to claim 1, is characterized in that, described filtering isolated location comprises inductance, transformer and electric capacity;
Described inductance is connected between the output of described inversion unit and the former limit winding of transformer;
The two ends described electric capacity in parallel of the secondary winding of transformer;
The two ends of described electric capacity are as the output of filtering isolated location.
4. the device that the reactive power compensation of photovoltaic parallel in system and harmonic wave suppress according to claim 3, is characterized in that, described current acquisition module is specially Hall element, and described Hall element is for gathering the electric current of described electric capacity output.
5. according to the device of the reactive power compensation of photovoltaic parallel in system described in claim 1-4 any one and harmonic wave inhibition, it is characterized in that, also comprise voltage detection module and voltage protection module;
Described voltage detection module, for gathering the voltage of inversion unit direct-flow input end;
Described voltage protection module, when the voltage of described voltage detection module detection surpasses preset range, sends locking signal, to cut off the input of inversion unit DC side.
6. the method that the reactive power compensation of photovoltaic parallel in system and harmonic wave suppress, is characterized in that, comprising:
Gather the electric current of filtering isolated location output;
The electric current of collection is decomposed into fundamental current component, harmonic current components, reactive current component and active current through Fourier transform formula;
Described harmonic current components and reactive current component are added to acquisition offset current;
Predefined instruction current and offset current are compared;
Comparative result output PWM waveform according to described instruction current and offset current, is specially: utilize hysteresis comparator to realize, wherein, the ring width of described hysteresis comparator represents with H, and instruction current represents with I1, and offset current represents with I2:
When I1-I2=H, the output signal of hysteresis comparator remains unchanged;
When I1-I2 >=H, the output signal of hysteresis comparator will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes high level from low level, make the PWM waveform of controlling bottom right brachium pontis switching tube become low level from high level;
When I1-I2≤H, the output signal of hysteresis comparator will be overturn, and the PWM waveform that makes to control the upper left brachium pontis switching tube in inversion unit becomes low level from high level, make the PWM waveform of controlling bottom right brachium pontis switching tube become high level from low level;
Described PWM waveform is driven to the state of each switching tube in rear control inversion unit, so that instruction current described in the current tracking of described filtering isolated location output.
7. the method that the reactive power compensation of photovoltaic parallel in system according to claim 6 and harmonic wave suppress, it is characterized in that, after the electric current of collection is decomposed into fundamental current component, harmonic current components, reactive current component and active current through Fourier transform formula, also comprise:
By low pass filter, the fundamental current component decompositing, harmonic current components, active current and reactive current component are carried out separated.
8. the method that the reactive power compensation of photovoltaic parallel in system according to claim 6 and harmonic wave suppress, is characterized in that, gathers the electric current of filtering isolated location output, is specially: adopt Hall element to gather the electric current of filtering isolated location output.
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| CN2011200529479U CN201994674U (en) | 2011-03-02 | 2011-03-02 | Reactive power compensation and harmonic suppression device for photovoltaic grid-combined system |
| CN201110050097.3A CN102074965B (en) | 2011-03-02 | 2011-03-02 | Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system |
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| CN2011200529479U CN201994674U (en) | 2011-03-02 | 2011-03-02 | Reactive power compensation and harmonic suppression device for photovoltaic grid-combined system |
| CN201110050097.3A CN102074965B (en) | 2011-03-02 | 2011-03-02 | Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201994674U (en) * | 2011-03-02 | 2011-09-28 | 英利能源（中国）有限公司 | Reactive power compensation and harmonic suppression device for photovoltaic grid-combined system |
| CN102624208B (en) * | 2012-04-23 | 2014-04-16 | 乐清市海鸟能源科技有限公司 | Harmonic suppression system and method of micropower grid-connected inverter |
| CN102982963B (en) * | 2012-11-14 | 2015-06-24 | 中国科学院高能物理研究所 | Electromagnet power source and control method and digital controller thereof |
| CN103066611B (en) * | 2012-12-23 | 2016-05-11 | 上海市电力公司 | A kind of control circuit of flexible reactive power compensation arrangement |
| CN103187729B (en) * | 2013-02-28 | 2015-06-24 | 华北电力大学 | Method and device for eliminating harmonic wave of photovoltaic grid connected charging system |
| CN103545815A (en) * | 2013-11-05 | 2014-01-29 | 四川安蕊环境工程有限公司 | Three-phase alternating-current building voltage-stabilizing electricity-saving device |
| CN104716648A (en) * | 2015-04-01 | 2015-06-17 | 华北电力科学研究院有限责任公司 | Modeling method of alternating current and direct current electric locomotive |
| CN106532761A (en) * | 2015-09-11 | 2017-03-22 | 沈阳兴东控制技术有限公司 | Multimodal photovoltaic grid-connected inverter |
| CN107332245A (en) * | 2017-08-29 | 2017-11-07 | 云南电力试验研究院(集团)有限公司 | A kind of harmonic wave and idle administering method |
| CN110957754A (en) * | 2019-10-29 | 2020-04-03 | 国网江苏省电力有限公司盐城供电分公司 | Photovoltaic inverter based on harmonic suppression and harmonic suppression method |
| CN115528692B (en) * | 2022-11-22 | 2023-02-28 | 云南电力试验研究院(集团)有限公司 | Distributed new energy adaptive active impedance control method and device |
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| CN201994674U (en) * | 2011-03-02 | 2011-09-28 | 英利能源（中国）有限公司 | Reactive power compensation and harmonic suppression device for photovoltaic grid-combined system |
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| CN102074965A (en) | 2011-05-25 |
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