CN105337573A - Site test method and system for phase modulation operation capability of photovoltaic inverter - Google Patents
Site test method and system for phase modulation operation capability of photovoltaic inverter Download PDFInfo
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Abstract
The invention discloses a site test method and system for the phase modulation operation capability of a photovoltaic inverter. The test method comprises: generating voltage disturbance by switching a photovoltaic feed line on a low voltage busbar for a photovoltaic power station, and then testing the response time and the response amplitude of the inverter with the phase modulation operation capability to voltage disturbance. The method and system can realize effective control of reactive power for a large power photovoltaic power station grid connected inverter. The test system comprises a voltage/current acquisition terminal with a wireless transmission function, and a data recording and analysis system based on Labview. The system can test the phase modulation operation conditions of a plurality of grid connected inverters at the same time, and finally generates a test report automatically. The site test method and system for the phase modulation operation capability of a photovoltaic inverter has the advantages of being high in test efficiency and being high in test accuracy, and can greatly promote popularization of phase modulation operation of a photovoltaic power station grid connected inverter, and can improve the reactive adjusting capability of the photovoltaic power station grid connected inverter.
Description
Technical field
The invention belongs to photovoltaic DC-to-AC converter phase modulation operation field, be specifically related to a kind of method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability.
Background technology
The reactive power source of GB " photo-voltaic power generation station access power system technology specifies " (GB/T19964-2012) clear stipulaties photo-voltaic power generation station comprises photovoltaic combining inverter and photo-voltaic power generation station reactive power compensator, and photo-voltaic power generation station will make full use of reactive capability and the regulating power thereof of combining inverter; When the reactive capability of inverter can not meet system voltage adjustment needs, should concentrate at photo-voltaic power generation station the reactive power compensator installing suitable capacity additional, install dynamic reactive compensation device additional if desired.Based on this standard, on-the-spot each the photo-voltaic power generation station run all is configured with dynamic reactive compensation device.But dynamic reactive compensation device extensively exists the high problem of failure rate in actual motion, for the daily maintenance work of photo-voltaic power generation station brings inconvenience, not only impact also site voltage regulation result, and consume a large amount of photo-voltaic power generation station station power consumptions.Thus, the importance of the reactive capability and regulating power thereof that make full use of combining inverter more highlights, develop photo-voltaic power generation station combining inverter phase modulation operation ability and large-scale popularization application, the Reactive-power control ability giving full play to each photo-voltaic power generation station combining inverter will produce huge economic benefit and social benefit.
Current, domestic grid-connected photovoltaic power generation station all requires the inductive reactive power compensation device configuring capacitive and about 5% accounting for installed capacity about 20%, and also usually requirement is the SVG of dynamic compensation, and cost costly.The domestic Reactive Power Control to photo-voltaic power generation station mainly for as if the tap that becomes of reactive power compensator (SVC or SVG) and on-load voltage regulation.Along with the development of power electronic technology and industrial control technology, the modulation system of inverter and control strategy there has also been very large lifting.Can distant place team control the idle of each inverter be regulated to exert oneself by the controller of distant place remote regulating, realize high power electronic equipment PWM(pulse-width modulation) four quadrant running, reach desirable idle dynamic regulating effect, photo-voltaic power generation station for involving great expense being saved substantial contribution, also can avoid the running wastage of reactive power compensator.
Early stage photo-voltaic power generation station combining inverter, due to technical reason, makes inverter send reactive power and participates in the ability that whole station reactive power regulates not yet to develop.But along with the development of inverter technology, attention degree inverter being participated in photo-voltaic power generation station reactive power regulating power is more and more higher.The main flow adopting the novel inverter possessing idle phase modulation ability to become newly-built photo-voltaic power generation station is gradually selected, this kind of inverter can realize the uneoupled control of active power of output, reactive power, can send idle (capacitive or perception) in right amount by system operation mode requirement and the control strategy adopted, the power system reactive power that can participate in accessing area to a certain extent regulates.Therefore, carry out technological transformation to extensive centralized grid-connected photovoltaic power generation station, the reactive power of exploitation combining inverter regulates potentiality to become the new approaches solved the problem.
At present, because the photovoltaic generation investor lacks collaborative, grid company is not yet unified to coordinate to photo-voltaic power generation station technology platform, after photo-voltaic power generation station builds up and puts into operation, reactive power operation becomes a large blind spot, and the reactive power compensator in photovoltaic DC-to-AC converter and photo-voltaic power generation station still can not realize the ability of combine regulation reactive power.Dependence test unit is when participating in grid-connected photovoltaic power generation station and carrying out technological transformation, photo-voltaic power generation station combining inverter Reactive-power control ability is lacked to the method for testing of standard, based on this present situation, the present invention is by the method and system of a kind of inverter phase modulation operation ability of research and development on-the-spot test.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of method and system inverter phase modulation operation ability being carried out to confirmatory test, the effective control to grid-connected high-power photovoltaic power station inverter reactive power (capacitive or perception) can be realized.Method of testing produces voltage disturbance by the photovoltaic feeder line on switching photo-voltaic power generation station low-voltage bus bar, and then test possesses the response time of each inverter to voltage disturbance, the response amplitude of phase modulation operation ability.
A kind of method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability, described method of testing produces voltage disturbance by the photovoltaic feeder line on switching photo-voltaic power generation station low-voltage bus bar, and then test possesses the response time of inverter to voltage disturbance, the response amplitude of phase modulation operation ability, described method and system can realize the effective control to high-power photovoltaic power station combining inverter reactive power (capacitive or perception); The system of described test comprise possess wireless transmission function voltage current acquisition terminal, based on the data record of Labview and analytical system.
Preferably, described voltage disturbance comprises step disturbance under step disturbance and voltage on voltage, upper step disturbance is realized by the photovoltaic feeder line on excision photo-voltaic power generation station low-voltage bus bar, lower step disturbance is realized by the photovoltaic feeder line dropped on photo-voltaic power generation station low-voltage bus bar, and voltage disturbance amount can be regulated by adjustment photovoltaic feeder line institute on-load capacity.
Preferably, described upper step disturbance is after the photovoltaic feeder line on excision photo-voltaic power generation station low-voltage bus bar, grid-connected point voltage raises, described lower step disturbance is after dropping into the photovoltaic feeder line on photo-voltaic power generation station low-voltage bus bar, grid-connected point voltage reduces, inverter improves according to grid-connected point voltage desired value or reduces voltage, until grid-connected point voltage reaches desired value.
Preferably, described acquisition terminal gather inverter ac side voltage electric current, send to management server through wireless transmission terminal; The described data record based on Labview and analytical system, can test the phase modulation operation situation of multiple stage inverter simultaneously, and the action sequence of comparison each inverter phase modulation operation and movement range, finally generate test report automatically.
Technical scheme of the present invention has following beneficial effect:
The invention provides a kind of method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability, realize the effective control to grid-connected high-power photovoltaic power station inverter reactive power (capacitive or perception).Produce voltage disturbance by the photovoltaic feeder line on switching photo-voltaic power generation station low-voltage bus bar, and then test possess the response time of each inverter to voltage disturbance, the response amplitude of phase modulation operation ability.Test macro comprise possess wireless transmission function voltage current acquisition terminal, based on the data record of Labview and analytical system, this test macro can test multiple stage inverter phase modulation operation situation simultaneously, comparison each inverter phase modulation operation action sequence and movement range, finally generate test report automatically.The method and system of inverter phase modulation operation ability on-the-spot test has the advantage that testing efficiency is high, test accuracy is high, to popularization photo-voltaic power generation station combining inverter phase modulation operation, play photo-voltaic power generation station combining inverter Reactive-power control ability and there is good facilitation.
Accompanying drawing explanation
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Fig. 1 is inverter phase modulation operation aptitude tests method schematic diagram in the embodiment of the present invention;
Fig. 2 is inverter phase modulation operation capacity test system schematic diagram in the embodiment of the present invention;
Fig. 3 is based on the data record of Labview and analytical system software flow schematic diagram in the embodiment of the present invention;
Fig. 4 is the hardware composition schematic diagram of inverter phase modulation operation capacity test system in the embodiment of the present invention:
Embodiment
In order to have a clear understanding of technical scheme of the present invention, its detailed structure will be proposed in the following description.Obviously, the concrete execution of the embodiment of the present invention also not enough specific details being limited to those skilled in the art and haveing the knack of.The preferred embodiments of the present invention are described in detail as follows, and except these embodiments described in detail, can also have other execution modes.
Below in conjunction with drawings and Examples, the present invention is described in further details.
The invention provides a kind of inverter phase modulation operation aptitude tests method, described method produces voltage disturbance by the photovoltaic feeder line on switching photo-voltaic power generation station low-voltage bus bar; Voltage disturbance comprises step disturbance under step disturbance and voltage on voltage, upper step disturbance is realized by the photovoltaic feeder line on excision photo-voltaic power generation station low-voltage bus bar, lower step disturbance is then realized by the photovoltaic feeder line dropped on photo-voltaic power generation station low-voltage bus bar, voltage disturbance amount by adjust corresponding photovoltaic feeder line with load capacity regulate.
The idle control effects of photo-voltaic power generation station depends on its idle fan-out capability, and the ability that photovoltaic DC-to-AC converter sends reactive power is not unlimited, but restrict by many factors.The idle fan-out capability of inverter exports relevant with inverter outlet voltage, access point voltage, Inductor and current active power.Due to the restriction of apparent power, if inverter the active power sent out many, then must cause the minimizing of output reactive power.Exporting to increase reactive power, just must reduce the output of active power.
If the idle limit of every platform inverter is
,
, for having the photovoltaic plant of n platform photovoltaic DC-to-AC converter, its total reactive power auxiliary service is:
In general, inverter allows short-term operation at 1.1 times of apparent power, and namely reactive power auxiliary service is by meritorious power influences,
, S is apparent power.As P=1.0p.u,
≤ 0.46p.u; As P=0,
≤ 1.1p.u.
In order to realize regulating and control the idle target in full station, the photovoltaic feeder line manufacturing switching required for voltage disturbance amount with load capacity size, can be calculated by photovoltaic feeder line active power knots modification of exerting oneself, grid-connected photovoltaic feeder line can to and site is injected with merit power or reactive power.When photovoltaic feeder line is grid-connected with unity power factor control, if there is the change of Δ u in grid-connected point voltage u, then the change of corresponding current i generation Δ i, photo-voltaic power generation station feeder line active power is exerted oneself and is changed the grid-connected point voltage variation caused and can be calculated as follows:
In formula, Δ
p pvfor photovoltaic feeder line active power is exerted oneself knots modification,
ufor and site load voltage value,
s kfor and site place capacity of short circuit,
for equiva lent impedance angle, Δ
i pfor photovoltaic system active current knots modification.From in formula, when photovoltaic feeder line is with meritorious power output to be greater than certain value, must cause and the voltage step amount of the enough scopes in site, it is 95% ~ 110% rated voltage that the grid-connected point voltage of standard regulation photo-voltaic power generation station runs allowed band.During test, first grid-connected piezoelectric voltage to 100% rated voltage is regulated, according to above formula, adopt the also site capacity of short circuit collected, according to positive and negative 5% voltage fluctuation, calculated the reactive capability of switching needed for concrete reactive power compensator respectively by AVC system, a key is handed down to each combining inverter afterwards, jointly sends the reactive power needed for full station by each inverter.
Further, described method of testing is by photo-voltaic power generation station and site place, each inverter outlet side arrange measurement point, simultaneously by all contravarianter voltages, electric current in the measurement field of test terminal.Grid-connected point voltage in station is made to produce the step amount of certain limit by switching photovoltaic feeder line, by idle for the inverter collected exert oneself situation of change after tested software calculate and be converted to reactive voltage, can verify in photo-voltaic power generation station the idle distribution condition of multiple stage photovoltaic DC-to-AC converter and Reactive-power control simultaneity that participate in testing, the final inverter phase modulation operation that obtains is to the control ability of photo-voltaic power generation station voltage simultaneously.
The present invention also provides a kind of test macro of inverter phase modulation operation ability, described system is gathered by the electricity Ya current acquisition terminal that multiple stage possesses wireless transmission function simultaneously and site, all inverter data in field, and be sent to management server by 4G wireless network; By being installed on the data record based on Labview on management server and analytical system, the data sent by acquisition terminal calculate and convert reactive power value to, and to each inverter idle output distribution situation, idle simultaneity analysis of exerting oneself, automatically generate the analysis report containing photo-voltaic power generation station grid-connected point voltage curve, each inverter is idle power curve.
Further, the described voltage possessing wireless transmission function current acquisition terminal sample rate higher than 2kHz, gather each photovoltaic DC-to-AC converter three-phase voltage, three-phase current signal, described terminal installs 4GSIM card additional, and its test data is sent to main website management server in real time by 4G mobile data network.Voltage current acquisition terminal system be made up of photovoltaic DC-to-AC converter, acquisition terminal, 4G mobile data network, main website management server, be divided into data acquisition, wireless transmission and main website to manage three parts.
Part of data acquisition be responsible for each the photovoltaic DC-to-AC converter voltage in full station the magnitude of current gather, then preserve, call for main website management server.The acquisition terminal of part of data acquisition mainly adopt RS-485 mode and photovoltaic DC-to-AC converter voltage current signal be connected.Acquisition terminal by RS-485 communication can directly read photovoltaic DC-to-AC converter voltage current signal.Due to, acquisition terminal only gather photovoltaic DC-to-AC converter voltage current signal, function is relatively simple, so utilize acquisition terminal to greatly reduce system cost to carry out data acquisition, and RS-485 communication has good anti-interference.
The communication fee of 4G mobile data network calculates carries out according to flow, and the semaphore that electricity Ya current acquisition terminal system gathers is relatively less, so the average discharge needed for transmission is less, expense is lower, and mobile manufacturer can provide business platform, structure acquisition system is more convenient, can reducing the construction costs and shorten the construction period, and the installation of equipment, use, maintenance are all more convenient.The communication of 4G mobile data network can complete the transmitted in both directions of data, the real-time online of network is good, transfer of data is without time delay, therefore can synchronously carry out the acceptance of data, process, so well meet the requirement of system to real-time and transmission speed, utilize this both-way communication mode, can complete underlying device remote control operation, parameter adjustments etc. such as acquisition terminals.The wide coverage of 4G mobile data network, within coverage, can complete the control and management to acquisition terminal, and unrestricted to access place, dilatation is unrestricted, can meet the photovoltaic DC-to-AC converter information gathering point access demand being distributed in Gobi desert area.
With reference to Fig. 4, main website management server be whole voltage the administrative center of electric current wireless acquisition terminal system, the photovoltaic DC-to-AC converter voltage that distant place data collection station is sent by wireless network by main website management server current signal process, main website management server can also carry out the remote control to acquisition terminal, can carry out the operations such as the parameter modification of acquisition terminal.
Further, described inverter phase modulation operation capacity test system is based on Labview software, comprise data acquisition, reactive power calculate, multiple terminals pair time, multiple terminals waveform comparison, the function such as automatic analysis, above-mentioned functions is realized one by one by virtual instrument software Labview, in Labview, carry out data acquisition to survey signal to be realized by Three models, be respectively single-point acquiring, waveform acquisition and continuous acquisition.Wherein, single-point acquiring is a sample value of sampling respectively from the analog input signal of each passage of collecting device, and after sampling terminates, this value reads by Labview in real time, without buffering ground, the shortcoming of this drainage pattern is exactly that collecting efficiency is low, cannot ensure the requirement on flexibility of data acquisition; Waveform acquisition carries out data acquisition to a part of waveform of analog input signal, hew out the buffering area that a section is used for depositing these sampled datas in a computer simultaneously, after the waveform input signal collection of specifying terminates, Labview successively by the digital independent in buffering area out; Continuous acquisition is equally also in a computer for sampled data hews out one section of buffering area, with waveform difference be, for continuous acquisition pattern the buffering area of opening up out be recycled, capture program is while by the data that collect stored in while buffering area, Labview is according to will read first Data Position arranged and read the length of data, to the data section of the carrying out read operation in buffering area.The number of the degree of depth of buffering area, sampling rate and each sampled data read is all arranged by user oneself by input control, reaches collection to carry out continuously and without the requirement of data from overflow by regulating above three parameter values.
This testing system software has user can the advantage such as self-defining instrumental function and structure, and have be easy to exploitation, conversion flexibly, the advantage such as highly versatile, result of use be good.Inverter phase modulation operation capacity test system based on virtual instrument technique achieves photovoltaic DC-to-AC converter voltage, the automatic collection of current information, process, display, the analytic function such as preservation and historical data, the Labview software configured by main website server after obtaining photovoltaic DC-to-AC converter voltage, current information, realize that reactive power calculates, multiple terminals pair time, multiple terminals waveform comparison, the function such as automatic analysis.
A kind of method of inverter phase modulation operation ability being carried out to confirmatory test that the present invention proposes, by the photovoltaic feeder line on switching photo-voltaic power generation station low-voltage bus bar during test, the grid-connected point voltage of photo-voltaic power generation station is made to produce disturbance, then the reactive capability of each the inverter participating in Reactive-power control in station is calculated respectively by AVC system, a key is handed down to each photovoltaic DC-to-AC converter afterwards, test and verify the idle distribution condition of multiple stage photovoltaic DC-to-AC converter and Reactive-power control simultaneity of testing in station simultaneously, obtaining inverter phase modulation operation to the control ability of photo-voltaic power generation station voltage.
As voltage disturbance in Fig. 1, figure comprises step disturbance under step disturbance and voltage on voltage, voltage disturbance amount by the photovoltaic feeder line that adjusts required switching with load capacity regulate; After the photovoltaic feeder line of described upper step disturbance on excision photo-voltaic power generation station low-voltage bus bar, grid-connected point voltage raises, and inverter reduces voltage, until grid-connected point voltage reaches desired value according to grid-connected point voltage desired value; Described lower step disturbance is after dropping into the photovoltaic feeder line on photo-voltaic power generation station low-voltage bus bar, and grid-connected point voltage reduces, inverter according to grid-connected point voltage desired value boosted voltage, until grid-connected point voltage reaches desired value.
First by each wireless acquisition terminal collection and information datas such as site busbar voltage, reactive power and each inverter reactive powers, give management server respectively and carry out potentiometer calculation and Analysis and reactive power computational analysis, then the information of voltage, varmeter calculation and Analysis is delivered to integrated treatment module to judge, then form inverter and unify regulating command, one key is handed down to each inverter makes it all participate in Reactive-power control in station, each inverter send desired volume idle after carry out the comparison of each wireless terminal waveform, finally generate analysis report.
As Fig. 2, the invention provides a kind of inverter phase modulation operation capacity test system, described test macro comprise possess wireless transmission function voltage current acquisition terminal, based on the data record of Labview and analytical system.Described acquisition terminal gather inverter ac side voltage electric current, its test data is sent to management server by during 4G radio data network implementation; The described data record based on Labview and analytical system, can test multiple stage inverter phase modulation operation situation simultaneously, and comparison each inverter phase modulation operation action sequence, movement range, generate test report automatically.
The method of testing of the present embodiment can cause grid-connected point voltage disturbance, thus makes each inverter in photo-voltaic power generation station send the reactive power of respective amount according to grid-connected point voltage situation of change, supports whole photo-voltaic power generation station grid-connected point voltage adjustment demand.
The present embodiment carries out the system of confirmatory test to inverter phase modulation operation ability, can test multiple stage inverter phase modulation operation situation simultaneously, and comparison each inverter phase modulation operation action sequence, movement range, generate test report automatically.
The present embodiment has to the method and system that inverter phase modulation operation ability carries out confirmatory test the advantage that testing efficiency is high, test accuracy is high, to popularization photo-voltaic power generation station combining inverter phase modulation operation, play combining inverter participation photo-voltaic power generation station reactive power regulating power and there is good facilitation.
The method and system that the present embodiment carries out confirmatory test to combining inverter phase modulation operation ability is that photo-voltaic power generation station reactive power compensation amount provides necessary foundation, namely under the condition of the reactive compensation capacity needed for combining inverter fully provides in station, make reactive power compensator in station send out reactive power less even directly out of service as far as possible, photo-voltaic power generation station for involving great expense being saved substantial contribution, also can avoid the running wastage of reactive power compensator.
As Fig. 3, a kind of method and system combining inverter phase modulation operation ability being carried out to confirmatory test that the present invention proposes, first by each wireless acquisition terminal collection and site busbar voltage, the information datas such as reactive power and each inverter reactive power, give management server respectively and carry out potentiometer calculation and Analysis and reactive power computational analysis, then voltage, the information of varmeter calculation and Analysis is delivered to integrated treatment module and is judged, then form inverter and unify regulating command, one key is handed down to each inverter makes it all participate in reactive power adjustment in station, each inverter carries out the comparison of each wireless terminal waveform after sending the reactive power of desired volume, finally generate analysis report.
Inverter phase modulation operation ability on-the-spot test method and system of the present invention has the advantage that testing efficiency is high, test accuracy is high, to popularization inverter phase modulation operation, plays photo-voltaic power generation station reactive power regulating power and has good facilitation.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the field still can modify to the specific embodiment of the present invention or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims awaited the reply.
Claims (4)
1. the method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability, it is characterized in that, described method of testing produces voltage disturbance by the photovoltaic feeder line on switching photo-voltaic power generation station low-voltage bus bar, and then test possesses the response time of inverter to voltage disturbance, the response amplitude of phase modulation operation ability, described method and system can realize the effective control to high-power photovoltaic power station combining inverter reactive power (capacitive or perception); The system of described test comprise possess wireless transmission function voltage current acquisition terminal, based on the data record of Labview and analytical system.
2. the method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability as claimed in claim 1, it is characterized in that, described voltage disturbance comprises step disturbance under step disturbance and voltage on voltage, upper step disturbance is realized by the photovoltaic feeder line on excision photo-voltaic power generation station low-voltage bus bar, lower step disturbance is realized by the photovoltaic feeder line dropped on photo-voltaic power generation station low-voltage bus bar, and voltage disturbance amount can be regulated by adjustment photovoltaic feeder line institute on-load capacity.
3. the method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability as claimed in claim 2, it is characterized in that, described upper step disturbance is after the photovoltaic feeder line on excision photo-voltaic power generation station low-voltage bus bar, grid-connected point voltage raises, described lower step disturbance is after dropping into the photovoltaic feeder line on photo-voltaic power generation station low-voltage bus bar, grid-connected point voltage reduces, and inverter improves according to grid-connected point voltage desired value or reduces voltage, until grid-connected point voltage reaches desired value.
4. the method and system to the on-the-spot test of photovoltaic DC-to-AC converter phase modulation operation ability as claimed in claim 1, is characterized in that, described acquisition terminal gather inverter ac side voltage electric current, send to management server through wireless transmission terminal; The described data record based on Labview and analytical system, can test the phase modulation operation situation of multiple stage inverter simultaneously, and the action sequence of comparison each inverter phase modulation operation and movement range, finally generate test report automatically.
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| CN107086598A (en) * | 2017-03-06 | 2017-08-22 | 江苏华源新能源科技有限公司 | A kind of photovoltaic plant voltage dynamic disturbances experimental control method |
| CN107436413A (en) * | 2017-06-14 | 2017-12-05 | 广州三晶电气股份有限公司 | A kind of photovoltaic DC-to-AC converter running status visualizing monitor device and method |
| CN108491298A (en) * | 2018-03-30 | 2018-09-04 | 山东泰开电力电子有限公司 | A kind of SVG apparatus testing methods, apparatus and system based on LabVIEW |
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