CN102170142A - Low-voltage ride-through method for photovoltaic inverter - Google Patents
Low-voltage ride-through method for photovoltaic inverter Download PDFInfo
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- CN102170142A CN102170142A CN2011101016696A CN201110101669A CN102170142A CN 102170142 A CN102170142 A CN 102170142A CN 2011101016696 A CN2011101016696 A CN 2011101016696A CN 201110101669 A CN201110101669 A CN 201110101669A CN 102170142 A CN102170142 A CN 102170142A
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Abstract
The invention discloses a low-voltage ride-through method for a photovoltaic inverter. The method comprises the following steps of: acquiring a power grid bus side voltage by using a voltage sensor, causing the power grid bus side voltage to pass through a conditioning circuit and transmitting the power grid bus side voltage into a digital signal processor; capturing and calculating a standard voltage amplitude value by using the digital signal processor; judging whether the standard voltage amplitude value is less than a set lower low-voltage limit or not; if the standard voltage amplitude is less than the set lower low-voltage limit, disconnecting the inverter from a contactor of a power grid; on the contrary, judging the duration of the standard voltage amplitude at the lower limit, keeping the inverter connected with the power grid if the duration is less than a standard, and on the contrary, disconnecting the inverter from the power grid; judging whether a power grid voltage unit value is less than a set upper voltage limit or not; performing grid-connection normally on the inverter if the power grid voltage unit value is greater than the set upper voltage limit; on the contrary, judging the duration of the power grid voltage unit value at the upper limit, keeping the inverter connected with the power grid if the duration is less than the standard, and on the contrary, disconnecting the inverter from the power grid; adopting the internally set voltage reference amplitude of the digital signal processor; and realizing inversion by taking the voltage reference amplitude as an inverter reference voltage.
Description
Technical field
The low-voltage that the present invention relates to a kind of photovoltaic DC-to-AC converter is passed through, the present invention relates to a kind of raising photovoltaic DC-to-AC converter stability that is incorporated into the power networks, the present invention relates to a kind of raising photovoltaic DC-to-AC converter reliability that is incorporated into the power networks, the present invention relates to a kind of of short duration on the low side and off-the-line of network system voltage that prevents.
Background technology
The energy is that human society exists and the important substance basis of developing, and along with the high speed development of society, the demand of the energy and resource is increasing, and well-known, non-renewable energy resources can be used up in the near future, and some new energy can arise at the historic moment.Photovoltaic generation is a kind of recognized techniques content height, rising new energy technology, this is because solar energy is inexhaustible, nexhaustible, does not produce any discarded object, does not have pollutions such as noise, can not produce harmful effect to environment, be desirable clean energy resource.
Photovoltaic generation such as He Jiankang, incorporating existing electrical network into safely, is a global difficult problem.It is introduced that electrical network breaks down when causing electric voltage dropping,, will cause the acute variation of whole system, cause large-area power-cuts if photovoltaic plant also excises immediately.As in little electrical network, when medium-and-large-sized motor of little electrical network or load startup, line voltage can fall temporarily, this moment, we did not wish that photovoltaic or other new energy resources system break away from from electrical network, and so-called low-voltage is passed through and is meant when this type of problem takes place in electric power system, and photovoltaic plant can keep being incorporated into the power networks, the support electric network fault recovers, thereby " pass through " this low-voltage time, avoid causing the extension of electric network fault, improve power supply reliability.
Pass through for the inverter low-voltage, obviously show as electric voltage dropping (sags can claim dips again), it is meant that at a time the amplitude of voltage departs from normal range of operation suddenly, returns to the phenomenon of normal level after very short a period of time again.At present, most literature is all used the characteristic quantity that the amplitude fallen and duration describe electric voltage dropping, but amplitude size and the confining spectrum of duration are not also formed unified standard.For example, in IEEE quality of power supply standard to the confining spectrum of electric voltage dropping characteristic quantity be the amplitude per unit value between 0.1～0.9, the duration is a half period to 1 minute; The IEC standard is then recently described the degree of depth of electric voltage dropping with the percentage of the difference of voltage before and after falling and normal voltage, the duration is defined as half period to tens second.In addition, the document that has voltage-phase deviation angle and occurrence frequency also as the characteristic quantity of describing electric voltage dropping.
The atrocious weather condition is the main cause that causes electric voltage dropping, and statistics shows that the electric voltage dropping more than 60% is relevant with atrocious weather (as thunderbolt, storm).The system failure, especially system are single-phase to be another major reason that causes electric voltage dropping to earth fault.When power system transmission line breaks down, on this circuit in addition the power consumer over the hundreds of rice still can be affected, its normal operating conditions is interfered.In addition, the serious distortion phenomenon of electric current followed when starting suddenly of some big loads (as big motor, the electric furnace arrangement for producing steel etc.) busbar voltage that also can cause this load to connect is fallen.
As seen, because the existence of the factor that some impersonal forces can reach, the electric voltage dropping phenomenon can not fundamentally be eliminated.Therefore, want to solve preferably the electric voltage dropping problem, then must consider from system and load two aspects, to prevent trouble before it happens on the one hand, suppress the influence of unfavorable factor, reduce the possibility that system voltage falls generation as much as possible, improve the power supply quality of electrical network system; Be actively to adopt remedial measures after phenomenon takes place on the other hand, the duration of electric voltage dropping was limited within several cycles, avoid or reduce its interference responsive power consumer when supply power voltage falls.
In the non-isolated island situation of new forms of energy grid-connected system, how to prevent that electric voltage dropping from causing inverter and electrical network to disconnect, but the new forms of energy grid-connected system can be kept being incorporated into the power networks, the support electric network fault recovers, thereby " pass through " this low-voltage time, avoid causing the extension of electric network fault, improve power supply reliability.
Pass through (LVRT:Low Voltage Ride Through) for the inverter low-voltage, what carry morely now is the wind energy combining inverter, when electric network fault or disturbance caused the electric voltage dropping of wind farm grid-connected point, in the scope of electric voltage dropping, the wind-powered electricity generation unit can uninterruptedly be incorporated into the power networks.
As follows in " the State Grid Corporation of China wind energy turbine set inserts electric power network technique regulation (revised edition) " to requiring of passing through of wind energy turbine set low-voltage:
A) the wind-powered electricity generation unit in the wind energy turbine set has the low voltage ride-through capability of the 625ms that can keep being incorporated into the power networks when the point voltage that is incorporated into the power networks falls to 20% rated voltage;
B) wind farm grid-connected point voltage can return to 90% o'clock of rated voltage in the 3s falling the back, and the wind-powered electricity generation unit in the wind energy turbine set keeps being incorporated into the power networks.
For photovoltaic generating system, photovoltaic generating system itself is equipment without spin, does not possess the electromechanical transient characteristic of conventional power source.Distributed power source off-grid not when the system side fault is the basic demand that distributed power source is incorporated into the power networks.Photovoltaic plant is because the general character of its distributed power source, do not have the electro-magnetic transient and the electromechanical transient characteristic of hydroelectric plant, thermal power plant, do not possess frequency modulation, pressure regulation ability, inverter output voltage breaks down in system, and the back is rapid to reduce, moment reactive voltage support can not be provided, therefore, photovoltaic plant must be installed dynamic passive compensation equipment.For large-scale wind electricity, photovoltaic plant base, must there be the hydroelectric plant of respective volume and thermal power plant to cooperate the safe operation that could guarantee electric power system.Low voltage ride-through capability has very important realistic meaning when therefore, studying photovoltaic generating system public network side generation transient fault.
In " the State Grid Corporation of China photovoltaic plant inserts electric power network technique regulation (trying) " to the photovoltaic parallel in system low-voltage require as follows:
Large-scale and medium-sized photovoltaic plant should possess the unusual ability of certain withstand voltage, avoids breaking away from when line voltage is unusual, causes the loss of electric network source.When being incorporated into the power networks point voltage in Fig. 1 in voltage profile line and the above zone time, photovoltaic plant must guarantee uninterruptedly to be incorporated into the power networks; When being incorporated into the power networks point voltage the voltage profile line is following in Fig. 1, allow photovoltaic plant to stop to send to power network line.
Among Fig. 1, U
L0For the minimum voltage limit value of normal operation, generally get 0.9 times of rated voltage.U
L1Be the lower voltage limit of needs tolerance, T1 is that electric voltage dropping is to U
L1The time need keep time of being incorporated into the power networks, T2 is that electric voltage dropping is to U
L0The time need keep time of being incorporated into the power networks.U
L1, the definite of T1, T2 numerical value need to consider actual conditions such as protection and reclosing operate time.Recommend U
L1Be set at 0.2 times of rated voltage, T1 is set at 1 second, T2 is set at 3 seconds.
For the photovoltaic combining inverter voltage standard, also need to satisfy following standard:
1) GB/T12325-2008 quality of power supply supply power voltage deviation;
2) voltage fluctuation of the GB/T12326-2008 quality of power supply and flickering;
After the supply power voltage deviation only referred to that photovoltaic plant inserts electrical network, the voltage deviation of points of common connection should satisfy the regulation of GB/T12325-2008 " quality of power supply supply power voltage deviation ", that is:
The absolute value sum of 35kV and the positive and negative deviation of above points of common connection voltage is no more than 10% of nominal voltage.
20kV and following three-phase points of common connection voltage deviation are nominal voltage ± 7%.
Annotate: as on the points of common connection voltage during lower deviation jack per line (being plus or minus), by bigger absolute value of the bias as weighing foundation.
After voltage fluctuation and flickering only referred to that photovoltaic plant inserts electrical network, the voltage fluctuation at points of common connection place and flickering should be satisfied the regulation of GB/T12326-2008 " quality of power supply voltage fluctuation and flickering ".
The variation in voltage limit value that photovoltaic plant causes the points of common connection place separately and change frequency, electric pressure are relevant.
Pass through for the photovoltaic combining inverter low-voltage, domestic now, in the world research arranged all:
On December 21st, 2010, the first cover of China is used for detection platform national energy solar power generation research and development (experiment) center that the photovoltaic plant low-voltage is passed through on-the-spot test, builds up in State Network Electric Power Research Institute.This platform has complete independent intellectual property right, is that the state-of-the-art in the world photovoltaic plant on-the-spot test low-voltage that is used for is passed through the device of performance at present.
It is the large test device that is used for checking the photovoltaic plant low voltage ride-through capability that low-voltage is passed through test platform, can uninterruptedly the be incorporated into the power networks ability of on-the-spot test photovoltaic plant under the electrical network abnormal conditions.
In international standard UL1741 file the 76th chapter abnormality test the 4th joint low-voltage shutoff test, stipulate clearly that also photovoltaic combining inverter should have certain low voltage ride-through capability.
In Germany, because the MW class photovoltaic combining inverter is put in the electrical network, therefore, Germany passes through the photovoltaic combining inverter low-voltage and proposes following requirement:
1) when line voltage drop to rated voltage 20% the time and the duration less than 150 milliseconds, photovoltaic combining inverter must not disconnect electrical network and connect;
2) if after 150 milliseconds, voltage does not return to 30% of rated voltage, and photovoltaic combining inverter should disconnect the electrical network connection so.
Can know that by the background technology data at present the low voltage ride-through capability of photovoltaic DC-to-AC converter has much room for improvement, as improve photovoltaic DC-to-AC converter be incorporated into the power networks stability, prevent the on the low side and off-the-line etc. of network system voltage.This patent is realized a kind of low-voltage traversing method of photovoltaic DC-to-AC converter, can solve some problems that existing low-voltage is stopped power supply.
Summary of the invention
The objective of the invention is to solve above-mentioned the deficiencies in the prior art and problem, a kind of low-voltage traversing method of photovoltaic DC-to-AC converter is provided, by the system voltage amplitude is detected, provide different voltage reference values, thereby realization photovoltaic combining inverter low-voltage is passed through.
Technical scheme of the present invention is as follows:
A kind of low-voltage traversing method of photovoltaic DC-to-AC converter comprises the steps:
The first step: gather electrical network bus bar side voltage by voltage sensor,, deliver in the digital signal processor with the voltage process modulate circuit that collects;
Second step: digital signal processor extracts the amplitude of line voltage, calculating voltage amplitude standard value by catching and calculating;
The 3rd step: judge that whether the voltage magnitude standard value is less than the low voltage set lowest limit;
The 4th step: if less than the low voltage set lowest limit, the contactor of inverter and electrical network disconnects; Otherwise judge in the lowest limit duration,, connect otherwise disconnect if the duration less than standard-required, allows inverter and electrical network keep being connected;
The 5th step: judge that whether the line voltage perunit value is less than the low voltage set upper limit;
The 6th step: if greater than the low voltage set lowest limit, inverter normally is incorporated into the power networks; Otherwise judge in the upper limit duration,, connect otherwise disconnect if the duration less than standard-required, allows inverter and electrical network keep being connected;
The 7th step: after voltage is lower than the low voltage set upper limit, adopt the Voltage Reference amplitude of digital signal processor inner setting;
The 8th step: the Voltage Reference amplitude realizes inversion as the inverter reference voltage.
The present invention has following beneficial effect: the low-voltage traversing method that the present invention is based on photovoltaic DC-to-AC converter adopts line voltage amplitude and drop-out time to judge whether to be low-voltage, realize that by it being provided with different reference voltage amplitudes low-voltages pass through and do not influence new forms of energy and generate electricity by way of merging two or more grid systems, improve photovoltaic DC-to-AC converter be incorporated into the power networks stability and reliability, prevent the of short duration on the low side and off-the-line of network system voltage simultaneously.
Description of drawings
Fig. 1 is the low-voltage tolerance requirement of the medium-and-large-sized and medium-sized photovoltaic plant of GB.
Fig. 2 is the low-voltage traversing method flow chart of photovoltaic DC-to-AC converter.
Fig. 3 is that the low-voltage traversing method reference voltage of photovoltaic DC-to-AC converter is selected flow chart.
Fig. 4 is the low-voltage traversing method system schematic of photovoltaic DC-to-AC converter of the present invention, among Fig. 4: 1-photovoltaic battery panel, 2-DC-DC translation circuit, 3-DC-AC inverter circuit, 4-filter circuit, 5-maximal power tracing (MPPT), 6-inverter control circuit, 7-island detection, 8-filter circuit, 9-AC network.
Embodiment
Below in conjunction with accompanying drawing the technology of the present invention content is explained:
Shown in Fig. 2,3, the concrete enforcement of the low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is as follows:
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that the collection line voltage, in chip, voltage magnitude is judged, by different voltage magnitudes being adopted different reference voltage amplitudes, this voltage magnitude as the current amplitude reference value, is realized photovoltaic power generation grid-connecting by inverter.Weigh the electric voltage dropping situation of photovoltaic parallel in system with amplitude of falling and duration, thereby realize that low-voltage passes through.
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described sampling unit by voltage sensor, and voltage sensor directly connects the electrical network bus bar side and is connected with the voltage modulate circuit.
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described control unit is made up of digital signal processor (Digital Signal Processor is called for short DSP).
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described line voltage is by collecting unit, voltage modulate circuit, be input to the digital signal processor (DSP) of control unit at last, then by the voltage of gathering being revised control PWM output.
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described digital signal processor (DSP) output control signal has driving to amplify.
Basic principle of the present invention:
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that the collection line voltage, in chip, voltage magnitude is judged,, provided different Voltage Reference amplitudes by judging, will to after the voltage magnitude adjustment as the current reference amplitude, realize photovoltaic power generation grid-connecting by inverter.When voltage falls, exceed our setting range if fall scope, system adopts and sets the reference voltage amplitude.
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described sampling unit by voltage sensor, and voltage sensor directly connects the electrical network bus bar side and is connected with the voltage modulate circuit.
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described control unit is made up of digital signal processor (Digital Signal Processor is called for short DSP).
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described line voltage is by collecting unit, voltage modulate circuit, be input to the digital signal processor (DSP) of control unit at last, then by the voltage of gathering being revised control PWM output.
The low-voltage traversing method of photovoltaic DC-to-AC converter of the present invention is characterised in that described digital signal processor (DSP) output control signal has driving to amplify.
Basic principle of the present invention is: by gathering grid side voltage, (DSP) carries out the voltage magnitude measuring operation at digital signal processor, extract voltage magnitude, by to system acquisition to voltage magnitude judge, judge that whether voltage magnitude is less than 0.2P.U (P.U is a perunit value), if the system voltage amplitude is less than 0.2P.U, photovoltaic DC-to-AC converter is regarded as fault, directly disconnects and being incorporated into the power networks; If the system voltage amplitude equals 0.2P.U, allow the photovoltaic parallel in system continuous service, if can the duration greater than 1s, photovoltaic parallel in system is regarded as fault, directly disconnects and being incorporated into the power networks; If can the duration be not more than 1s, system need carry out next step judgement.Whether judge the system voltage amplitude less than 0.85P.U (P.U is a perunit value), if the system voltage amplitude greater than 0.85P.U, then system normally moves; If the system voltage amplitude is not more than 0.85P.U, need judge the photovoltaic parallel in system low-voltage time, if can the duration greater than 2s, photovoltaic DC-to-AC converter is regarded as fault, directly disconnects and being incorporated into the power networks; If the system voltage amplitude is not more than 0.2P.U, allow the photovoltaic parallel in system continuous service.In invention, adopted two-way voltage as a reference, come from electrical network, obtain by voltage sensor, this road voltage magnitude is as the voltage reference value under the normal condition; Other comes to digital signal processor (DSP) inner setting, and this road voltage magnitude is as the voltage reference value under the electric voltage dropping situation, and two-way voltage switches realizes that by voltage magnitude low voltage ride-through capability reflected by the time.
Among the present invention, control unit is made up of digital signal processor (DSP), and it is according to the detection that is realized line voltage by sampling unit, voltage modulate circuit.With DSP is the control core unit, and the basic thought of its realization is: by algorithm controls with detect inverter and be incorporated into the power networks and realize that low-voltage passes through.Implementation procedure is as follows particularly:
(1) gather voltage by voltage sensor, DSP catches the sampled voltage maximum, and the maximum that collection is caught obtains voltage perunit value U ' divided by the default voltage max
Rms
(2) judge line voltage amplitude perunit value
U′
rms＜0.2P.U ①
(3) if 1. formula is set up, illustrate that present photovoltaic parallel in system is lower than GB and sets the lowest limit, the contactor between inverter and the electrical network disconnects; If 1. formula is false, continue to judge voltage magnitude perunit value situation.
(4) judge
U′
rms＝0.2P.U ②
If 2. formula is set up, illustrate that this moment, system moved in the low-voltage lowest limit, so need to continue to judge the duration, jump to step (5) and carry out.
If 2. formula is false, illustrate that this moment, system moved on the low-voltage lowest limit, so need to continue to judge the duration, jump to step (6) and carry out.
(5) system is at the operation of the low-voltage lowest limit, judgement time
Period1≤500 ③
Formula 3. in, Period1 actual electric network voltage magnitude perunit value is a lasting periodicity under the 0.2P.U.
If 3. formula is set up, this moment system is described in low-voltage lowest limit operation, the duration in tolerance band, voltage reference value selective system set point U '
Set=1.0P.U.
Annotate: U '
SetBe expressed as that perunit value is 1 under the electrical network normal condition.
If 3. formula is false, illustrate that this moment, system moved on the low-voltage lowest limit, the duration, the contactor between inverter and the electrical network disconnected not in tolerance band.
(6) system moves on the low-voltage lowest limit, judgement time
Period2≤1000 ④
Formula 4. in, Period2 actual electric network voltage magnitude perunit value is a lasting periodicity under 0.2P.U～0.85P.U.
If 4. formula is set up, illustrate this moment system on the low-voltage lowest limit, move, the duration in tolerance band, voltage reference value selective system set point U '
Set=1.0P.U.
Annotate: U '
SetBe expressed as that perunit value is 1 under the electrical network normal condition.
If 4. formula is false, illustrate that this moment, system moved on the low-voltage lowest limit, the duration, the contactor between inverter and the electrical network disconnected not in tolerance band.
(7) with the voltage magnitude reference value that obtains as the inverter reference amplitude, realize inversion grid connection.
As shown in Figure 4, the low-voltage traversing method system of photovoltaic DC-to-AC converter of the present invention is mainly by photovoltaic battery panel, DC-DC translation circuit, DC-AC inverter circuit, filter circuit, maximal power tracing (MPPT), inverter control circuit, filter circuit and AC network.
Send photovoltaic battery panel electric current and voltage by sampling unit, current regulating circuit, realize the maximal power tracing algorithm in digital signal processor (DSP), control PWM output waveform realizes power adjustments.By adopting unit, modulate circuit to send AC network bus bar side voltage, realization inversion algorithm, island detection and low-voltage are passed through in digital signal processor (DSP).
When implementing, electrical network bus bar side output voltage is for exchanging, and sampling unit working voltage sensor goes out the voltage of electrical network bus bar side.Because what control unit used is dsp chip, the A/D converter that carries on its sheet is unipolar, can only receive the voltage signal of 0～3.3V, therefore gathers voltage and need change, and could be connected with the DSP of control unit like this.The low-voltage that realizes photovoltaic DC-to-AC converter in DSP is passed through algorithm, with combining control inverter output with photovoltaic inversion algorithm, realizes that the low-voltage of photovoltaic DC-to-AC converter is passed through.
Claims (1)
1. the low-voltage traversing method of a photovoltaic DC-to-AC converter is characterized in that described method comprises the steps:
The first step: gather electrical network bus bar side voltage by voltage sensor,, deliver in the digital signal processor with the voltage process modulate circuit that collects;
Second step: digital signal processor extracts the amplitude of line voltage, calculating voltage amplitude standard value by catching and calculating;
The 3rd step: judge that whether the voltage magnitude standard value is less than the low voltage set lowest limit;
The 4th step: if less than the low voltage set lowest limit, the contactor of inverter and electrical network disconnects; Otherwise judge in the lowest limit duration,, connect otherwise disconnect if the duration less than standard-required, allows inverter and electrical network keep being connected;
The 5th step: judge that whether the line voltage perunit value is less than the low voltage set upper limit;
The 6th step: if greater than the low voltage set lowest limit, inverter normally is incorporated into the power networks; Otherwise judge in the upper limit duration,, connect otherwise disconnect if the duration less than standard-required, allows inverter and electrical network keep being connected;
The 7th step: after voltage is lower than the low voltage set upper limit, adopt the Voltage Reference amplitude of digital signal processor inner setting;
The 8th step: the Voltage Reference amplitude realizes inversion as the inverter reference voltage.
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Cited By (13)
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| CN102723740A (en) * | 2012-07-13 | 2012-10-10 | 浙江埃菲生能源科技有限公司 | Stable MPPT (Maximum Power Point Tracking) control system and method of single-stage photovoltaic inverter |
| CN102738827A (en) * | 2012-06-20 | 2012-10-17 | 天津电气传动设计研究所 | Low voltage ride through control method for three-phase network connection photovoltaic inverter |
| CN102751741A (en) * | 2012-07-13 | 2012-10-24 | 浙江埃菲生能源科技有限公司 | Low-voltage ride through (LVRT) control system of photovoltaic inverter and method thereof |
| CN103138383A (en) * | 2013-02-27 | 2013-06-05 | 深圳航天科技创新研究院 | Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method |
| CN103269086A (en) * | 2013-04-24 | 2013-08-28 | 西安理工大学 | Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter |
| CN103368433A (en) * | 2013-07-31 | 2013-10-23 | 华为技术有限公司 | Inverter and PWM (pulse width modulation) modulation method |
| CN103858302A (en) * | 2011-10-28 | 2014-06-11 | 艾思玛太阳能技术股份公司 | Tracking method and tracking device for a voltage transformer for a photovoltaic system |
| CN103944507A (en) * | 2014-02-18 | 2014-07-23 | 国家电网公司 | Photovoltaic-power-station low-voltage penetrating performance evaluation method based on inverter model test |
| WO2014173002A1 (en) * | 2013-04-27 | 2014-10-30 | 京东方科技集团股份有限公司 | Method and device for controlling low voltage ride through of photovoltaic grid-connected inverter |
| CN104901337A (en) * | 2015-06-24 | 2015-09-09 | 河海大学 | Rated power control method for photovoltaic grid-connected system low voltage ride through |
| CN108899931A (en) * | 2018-08-01 | 2018-11-27 | 湖南大云信息科技有限公司 | A kind of micro-capacitance sensor low voltage ride through control system |
| CN109245086A (en) * | 2017-07-11 | 2019-01-18 | 国家电网公司 | A kind of photovoltaic DC system and its low voltage traversing control method |
| DE102022122683A1 (en) | 2022-09-07 | 2024-03-07 | Sma Solar Technology Ag | METHOD FOR OPERATING AN INVERTER |
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