CN103064023B - For grid-connected proving installation and the method for testing thereof of wind-powered electricity generation and photovoltaic - Google Patents
For grid-connected proving installation and the method for testing thereof of wind-powered electricity generation and photovoltaic Download PDFInfo
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Abstract
The invention provides a kind of grid-connected proving installation for wind-powered electricity generation and photovoltaic and method of testing thereof; described proving installation comprises: power converter, series transformer, shunt transformer, input isolating switch, output isolating switch, protective breaker, first to fourth function change-over switch and by-pass switch and DSP control detecting unit; described proving installation input end connects electrical network, and its output terminal connects wind power generating set as test system or photo-voltaic power generation station.The present invention superposes electrical network rated voltage by power converter output bias voltage or harmonic voltage or fundamental voltage reaches grid adaptability test request, therefore the capacity of power converter is far smaller than the rated capacity of test system, due to the reduction of Converter Capacity, can realize that system cost is low, volume is little, lightweight, thermal value is little, reliability is high.
Description
Technical field
The invention belongs to the proving installation of grid-connected system in new energy field, a kind of grid-connected proving installation for wind-powered electricity generation and photovoltaic and method of testing thereof are provided especially, the grid adaptability functional test of Wind turbines and photovoltaic plant can be met.
Background technology
In recent years, rapidly, installed capacity increases the development of China Wind Power Generate, Generation, Generator volt power generating industry year after year fast.Such as, 2010, newly-increased 12904 of Wind turbines, installed capacity 18.93GW, increased by 73.3% on a year-on-year basis, and accumulative installed capacity reaches 44.733GW, exceedes the U.S. and ranks first in the world, and has three wind-powered electricity generation device fabrication enterprises to enter top ten of the world.2011, Chinese photovoltaic products production capacity 30GW, accounted for large photovoltaic enterprise of global production capacity 60%, the You Shuojia world ten from China.At present, China national Bureau of Energy discloses " 12 " object of planning of Renewable Energy Development, and by 2015, wind-electricity integration installed capacity will reach 100GW, produces energy 1,900 hundred million kilowatt hour per year; Photovoltaic generation installed capacity will reach 21GW, produce energy 25,000,000,000 kilowatt hour per year.
Meanwhile, Wind Power In China and photovoltaic run and have also occurred a lot of problem: China repeatedly there occurs extensive blower fan off-grid event at present, as on February 24th, 2011, there is cable fault in middle electric Jiuquan wind-powered electricity generation company bridge west the first wind energy turbine set, cause three-phase shortcircuit, cause 16 wind energy turbine set 598 typhoon group of motors off-grids.April 17, synergism wind-powered electricity generation company of Gansu Guazhou County dry river mouth west the second wind energy turbine set fault, causes 15 wind energy turbine set, 702 unit off-grids, on the same day, also has an accident in body in Zhangjiakou Area, Hebei Province state Hua Jiaxin wind energy turbine set, 644 typhoon group of motors off-grids, etc.Trace it to its cause, first, it is one of the main reasons that blower fan does not possess low voltage crossing, and this has been the common recognition that industry is formed.But blower fan is poor to grid adaptability, be one of them major reason equally, and also present situation occurred frequently gradually due to the blower fan off-grid accident caused grid adaptability scarce capacity.Same in photovoltaic generation, because solar energy power generating energy density is low, it is poor to stablize, regulating power is poor, generated energy is larger by the impact of weather and region, also can to power grid security after generating electricity by way of merging two or more grid systems, stable, the power supply quality of economical operation and electrical network causes certain influence.For this reason, large-scale wind-power electricity generation or photovoltaic power generation grid-connecting run the sound development that the immense pressure brought to electricity net safety stable governs China's wind-powered electricity generation and photovoltaic industry.
In order to prevent, or even stop wind-powered electricity generation and the grid-connected safety and stability problem brought to electrical network, guarantee the safety of system installer and the reliability service of electrical network, at present, China has taken measure and has formulated standard, associated " power grid adaptability of wind generator set test procedure " and " photo-voltaic power generation station access power system technology regulation " linked network consults on, require that carrying out grid adaptability to grid-connected system (comprises voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptability) aptitude tests, also to meet the quality of power supply to require and grid-connected technical requirement simultaneously.Just need the adaptability of being tested wind-powered electricity generation and photovoltaic parallel in system by special equipment simulating grid fault conditions for this reason.
Such as, application number 201120134815.0 patent document discloses Large Copacity flexible grid-connected photovoltaic inverter detection platform, this test platform comprises isolating transformer, controllable direct current power supply, for the input for inverter to be measured; Grid disturbance generating means; Many tap transformers; RLC load centralized control system; Wherein, inlet wire connects isolating transformer, and isolating transformer exports as test bus, and test bus branch is by the input as controllable direct current power supply after isolating transformer, and controllable direct current power supply exports reception and surveys transformer; Another branch is by the disturbing generating device that gets access to grid after isolating transformer step-down, and the output of grid disturbance generating means connects many tap transformers, and the AC of inverter is surveyed in the output reception of many tap transformers.
Application number 201010206913.0 patent document discloses a kind of device for testing power grid adaptability of wind generator set, this device comprises the current transformer built based on power semiconductor device, this current transformer input end connects three-phase supply, and output terminal connects wind power generating set.
Relevant grid adaptability proving installation disclosed in these patent documentations above-mentioned or be for Wind turbines, or be for photovoltaic DC-to-AC converter, apply single; And second patent adopts power converter to complete total power test, and its volume is large, cost is high, also adds the manufacture difficulty of Iarge-scale system, the dilatation of power-limiting current transformer.
Summary of the invention
The present invention is in view of described problem, there is provided a kind of grid-connected proving installation for wind-powered electricity generation and photovoltaic and method of testing thereof, this device can meet power grid adaptability of wind generator set test request, can meet again photo-voltaic power generation station grid adaptability test request, its structure is simple, has very strong practicality.Simultaneity factor provides rated voltage and fundamental voltage etc. as reference voltage by accessing electrical network, utilizes power converter device to provide to meet deviation voltage △ U and each harmonic voltage U n of test request.Therefore, proving installation capacity provided by the invention is far smaller than system nominal capacity, makes that its volume is little, cost is low, easy to manufacture.
The present invention is a kind of grid-connected proving installation for wind-powered electricity generation and photovoltaic, it is characterized in that, described grid-connected proving installation comprises: power converter, series transformer, shunt transformer, input isolating switch, export isolating switch, protective breaker, first to fourth function change-over switch and by-pass switch and DSP control detecting unit, the input end of grid-connected proving installation connects electrical network, output terminal connects as the wind power generating set of test system or photo-voltaic power generation station, the input end of input isolating switch is connected to electrical network, the output terminal of input isolating switch connects winding one end, series transformer former limit, connect the input end of protective breaker simultaneously, the other end of series transformer former limit winding connects the input end of the second function change-over switch, the output terminal of the second function change-over switch connects the input end exporting isolating switch, the output terminal exporting isolating switch is connected to test system, the output terminal of protective breaker connects the input end of power converter, the output terminal of power converter connects the input end of the first function change-over switch and the 3rd function change-over switch respectively, the output terminal of the first function change-over switch connects series transformer vice-side winding, the output terminal of the 3rd function change-over switch connects the input end of shunt transformer, the output terminal of shunt transformer connects the input end of the 4th function change-over switch, the output terminal of the 4th function change-over switch is connected to the input end exporting isolating switch, by-pass switch is connected across input isolating switch output terminal and exports isolating switch input end.
Be preferably, described power converter is all converter topologies with energy in bidirectional flow.
Be preferably, the deviation voltage that power converter exports by described series transformer and harmonic voltage are coupled to transformer primary side by vice-side winding, and described shunt transformer sends power converter output frequency to test system, realizes voltage matches simultaneously.
Be preferably, described first to fourth function change-over switch and by-pass switch are mechanical switch or electronic switch.
The present invention is a kind of method of testing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic, use the described grid-connected proving installation for wind-powered electricity generation and photovoltaic, the voltage adaptation of Wind turbines and photo-voltaic power generation station, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptability are tested.
Be preferably, first to fourth function change-over switch is for controlling test voltage adaptability, imbalance of three-phase voltage adaptability, flickering adaptability, harmonic wave adaptability or test frequency adaptability; By-pass switch is for controlling actual electric network access or simulating grid access.
Be preferably, in described voltage adaptation, three-phase imbalance adaptability and the adaptive test of flickering, there is provided rated voltage as reference voltage by access electrical network, control power converter device and the deviation voltage meeting test request is provided, by series transformer superposition rated voltage and deviation voltage, to realize voltage adaptation, three-phase imbalance adaptability and flickering adaptive testing requirement.
Be preferably, in described harmonic voltage adaptive testing, there is provided fundamental voltage as reference voltage by access electrical network, control power converter device and each harmonic voltage meeting test request is provided, by series transformer superposition fundamental voltage and each harmonic voltage, to realize harmonic voltage adaptive testing requirement;
Be preferably, in described frequency adaptability test, by controlling the output frequency of power converter, and shunt transformer energy transferring, to realize the test request of frequency adaptability.
In the method for testing of the grid-connecting apparatus for wind-powered electricity generation and photovoltaic of the present invention, described DSP controls detecting unit for controlling power converter switching device, input circuit breaker Q
i, export circuit breaker Q
o, protective breaker Q
pand first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
bP; Simultaneously detection power current transformer input voltage, electric current, phase place, the input voltage, electric current, phase place etc. of the DC voltage of power converter, electric current and test system.Control power converter switching device according to detected value, export the voltage, frequency, harmonic wave etc. that meet test request.
Described proving installation can simulate the electrical network characteristic comprising voltage, frequency, three-phase imbalance, voltage fluctuation and flicker, harmonic voltage, meets wind-powered electricity generation and grid-connected grid adaptability test request.
Proving installation of the present invention had both comprised common three-phase system, also comprised the three-phase system of band ground wire or band center line or band ground wire and center line.
At present, grid adaptability test relevant criterion requires: require when voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability, harmonic wave adaptive testing that test system average active power exports respectively at 10%, 10%, 50%, 30%, more than 50% of rated power.
Proving installation of the present invention is all provide rated voltage or fundamental voltage by electrical network to voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and the adaptive test of harmonic wave, power converter is only to provide deviation voltage or each harmonic voltage, as long as all capacity for power converter meet deviation voltage and each harmonic voltage needs capacity.
The frequency adaptability of proving installation of the present invention is the total power being provided test request completely by power converter, so power converter must meet the power requirement of frequency adaptability test, namely rated power more than 10%.
Comprehensive above grid adaptability measuring technology scheme, as long as design power Converter Capacity meets capacity required for voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic wave adaptive testing large deviations voltage or each harmonic voltage and meets during frequency adaptability is tested and reaches more than 10% of rated power in proving installation of the present invention.Therefore, Capacity design for power converter can be far smaller than test system rated capacity, along with the reduction of Converter Capacity, a series of benefit can be brought thus, such as cost is low, volume is little, lightweight, thermal value is little, reliability is high, this is for the Mobile Test Unit be integrated in inside container, and the advantage brought is very huge.
For the grid-connected proving installation for wind-powered electricity generation and photovoltaic described in an embodiment of the present invention, if grid adaptability associated test standards improves test rated power later, the rated power that especially will reach during frequency adaptability test, proving installation of the present invention only needs to improve the rated power that power converter design capacity reaches frequency adaptability test request; Due in technical solution of the present invention for the adaptive testing beyond frequency adaptability, power converter only provides deviation voltage and each harmonic, so still do not lose the less advantage of power converter capacity, simultaneously proving installation of the present invention can not by holding quantitative limitation for the Wind turbines tested or photo-voltaic power generation station, alleviate power converter dilatation difficulty greatly, expand its range of application.
Beneficial effect of the present invention is as follows:
1, the various characteristics of energy simulating grid of the present invention, comprise the electrical network characteristics such as voltage, frequency, three-phase imbalance, voltage fluctuation and flicker, harmonic voltage, can meet wind-powered electricity generation and grid-connected grid adaptability test request.
As long as the Capacity design of the power converter 2, in the present invention meets capacity required for voltage adaptation, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic wave adaptive testing large deviations voltage and each harmonic voltage and meets in frequency adaptability test reach more than 10% of rated power.So the Capacity design of power converter can be far smaller than test system rated capacity, along with the reduction of Converter Capacity, a series of benefit can be brought thus, such as cost is low, volume is little, lightweight, thermal value is little, reliability is high, this is for the Mobile Test Unit be integrated in inside container, and the advantage brought is very huge.
3, according to the present invention, if grid adaptability associated test standards improves test rated power later, the rated power that especially will reach during frequency adaptability test, proving installation of the present invention only needs to improve the rated power that power converter design capacity reaches frequency adaptability test request; Due in technical solution of the present invention for the adaptive testing beyond frequency adaptability, power converter only provides deviation voltage and each harmonic, so still do not lose the less advantage of power converter capacity, simultaneously proving installation of the present invention can not by the limit value of capacity for the Wind turbines tested or photo-voltaic power generation station, alleviate power converter dilatation difficulty greatly, expand its range of application.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic described in an embodiment of the present invention;
Fig. 2 is the principle of work block diagram that the DSP of the grid-connected proving installation of wind-powered electricity generation described in an embodiment of the present invention and photovoltaic controls detecting unit;
Fig. 3 is the connection circuit figure of the grid-connected proving installation for wind-powered electricity generation and photovoltaic described in an embodiment of the present invention.
Embodiment
Below, by reference to the accompanying drawings, the specific embodiment of the present invention is further described.
An embodiment of the present invention is grid-connected proving installation for wind-powered electricity generation and photovoltaic and method of testing thereof, be illustrated in figure 1 the structural drawing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic described in an embodiment of the present invention, described grid-connected proving installation comprises power converter, series transformer, shunt transformer, input circuit breaker Q
i, export circuit breaker Q
o, protective breaker Q
pand first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
bP.Its input end gets access to grid, and output terminal connects test system, and test system can be wind power generating set or photo-voltaic power generation station.The various characteristics of described proving installation energy simulating grid, comprise the electrical network characteristics such as voltage, frequency, three-phase imbalance, voltage fluctuation and flicker, harmonic voltage, meet wind-powered electricity generation and grid-connected grid adaptability test request.
Power converter comprise all there is energy in bidirectional flow three-phase or single-phase high voltage or low pressure converter topologies, as three-phase four-quadrant current transformer, three-phase Multilevel Inverters and three-phase system of being made up of single-phase converter etc.Adopt any converter topologies can consider according to combined factors such as test system electric pressure, installed capacities.
The former limit windings in series of series transformer is between electrical network and test system, and vice-side winding connects power converter output terminal by the first function change-over switch S1 is closed.Series transformer is used for the deviation voltage of power converter output or each harmonic voltage to be coupled to former limit superposition electrical network rated voltage through vice-side winding, thus change operation of power networks parameter, simulating grid voltage deviation, imbalance of three-phase voltage, voltage fluctuation and flicker, harmonic voltage etc., complete voltage adaptation in Wind turbines and photo-voltaic power generation station grid adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptive testing requirement.
The former limit of shunt transformer is connected on power converter outgoing side by the 3rd function change-over switch S3, and secondary is connected on the input side exporting circuit breaker Q O by the 4th function change-over switch S4.Shunt transformer provides path and matching voltage grade for grid adaptability medium frequency adaptability.
By-pass switch S
bPfor controlling actual electric network access or simulating grid access, closes bypass switch S
bP, test system is powered by actual electric network, is generally used for waiting for test condition; When meeting test condition, bypass switch opens S
bP, enter test process, test system is powered by simulating grid.
First to fourth function change-over switch S1, S2, S3, S4 are for controlling frequency adaptability test or other adaptive testings except frequency adaptation.Closed first function change-over switch S1 and the second function change-over switch S2, disconnect the 3rd function change-over switch S3 and the 4th function change-over switch S4, complete voltage adaptation, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptive testing by series transformer coupled power current transformer output bias voltage or each harmonic voltage superposition electrical network rated voltage or fundamental voltage; Closed 3rd function change-over switch S3 and the 4th function change-over switch S4, disconnect the first function change-over switch S1 and the second function change-over switch S2, complete separately frequency adaptability test by parallel converters transmitted power current transformer output frequency and self matching voltage.
In proving installation of the present invention, first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
bPbe not limited in mechanical switch, they all or part also can replace with electronic switch, as solid-state switch, using the semiconductor switch device such as thyristor, GTO, IGBT, IGCT as its on-off element.
The DSP being illustrated in figure 2 the grid-connected proving installation for wind-powered electricity generation and photovoltaic described in an embodiment of the present invention controls the principle of work block diagram of detecting unit, control module is as the core of control system hardware circuit, adopt high speed digital signal processor DSP TMS320F28335, the system that achieves is quick, accurate, high precision is run to utilize its high speed processing ability, High-Accuracy PWM to export, and utilize processor floating point processing unit accelerated procedure to develop, reduce cost of development.
DSP controls detecting unit for controlling power converter switching device, input circuit breaker Q
i, export circuit breaker Q
o, protective breaker Q
pand first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
bP; Detection power current transformer input voltage, electric current, phase place simultaneously, power converter DC voltage, electric current, and test system input voltage, electric current, phase place etc.Control power converter switching device according to detected value, export the voltage, frequency, harmonic wave etc. that meet test request.
Grid-connected proving installation for wind-powered electricity generation and photovoltaic of the present invention and method of testing thereof, Wind turbines can be met and photovoltaic plant relates to net key index-grid adaptability functional test simultaneously, wherein for voltage adaptation, three-phase imbalance adaptability and the adaptive test of flickering, there is provided rated voltage Ue as reference voltage by access electrical network, control power converter device and export the deviation voltage △ U meeting test request, voltage adaptation is realized by series transformer superposition rated voltage Ue and deviation voltage △ U, three-phase imbalance adaptability and flickering adaptive testing requirement.
Grid-connected proving installation for wind-powered electricity generation and photovoltaic of the present invention and method of testing thereof, Wind turbines can be met and photovoltaic plant relates to net key index simultaneously---grid adaptability functional test, wherein for the adaptive test of harmonic voltage, there is provided fundamental voltage U1 as reference voltage by access electrical network, control power converter device and export each harmonic voltage U n meeting test request, realize harmonic wave adaptive testing requirement by series transformer superposition fundamental voltage U1 and each harmonic voltage U n.
The present invention is a kind of grid-connected proving installation for wind-powered electricity generation and photovoltaic, Wind turbines can be met and photovoltaic plant relates to net key index-grid adaptability functional test simultaneously, wherein frequency adaptability is tested, by controlling power converter output frequency, and shunt transformer energy transferring thus realize frequency adaptability test request.
Being illustrated in figure 3 the grid-connected proving installation connection circuit figure for wind-powered electricity generation and photovoltaic described in an embodiment of the present invention, is a kind of common three-phase three-line system.Proving installation of the present invention further comprises the three-phase system of band ground wire or band center line or band ground wire and center line.
Illustrate various grid adaptability test process according to Fig. 3 below:
1, voltage adaptation:
According to grid adaptability relevant criterion, during voltage adaptation test, line voltage regulates in 0.9p.u. ~ 1.4p.u, and the step-length of Voltage Cortrol is 1% of rated voltage.Voltage adaptation of the present invention is under electrical network provides the prerequisite of rated voltage, and the deviation voltage △ U exported by superposition power converter is reached test system input voltage and regulates within the scope of 0.9p.u. ~ 1.4p.u, realizes voltage adaptation test request.
Voltage adaptation of the present invention is implemented as follows:
Before test, closed input circuit breaker Q
i, export circuit breaker Q
owith by-pass switch S
bP, all the other all switches are all in off-state, and test system is powered by actual electric network, wait to be tested.
After meeting test condition, closed first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
bP, test system is powered by simulating grid, starts test.Rated voltage U1 is provided by the former limit of series transformer to test system by electrical network, again by controlling power converter output bias voltage △ U, deviation voltage △ U is coupled to former limit through series transformer secondary, electrical network rated voltage U1 superposes series transformer coupling deviation voltage △ U, thus reach the requirement regulating test system input terminal voltage (U1 ± △ U), afterwards, test according to the voltage adaptation testing procedure specified in standard.The step-length of wherein Δ U=0 ~ ± 0.4p.u., △ U is 1% of rated voltage.
After having tested, closes bypass switch S
bP, disconnect the first function change-over switch S1 and the second function change-over switch S2.
2, imbalance of three-phase voltage adaptability:
According to grid adaptability relevant criterion, imbalance of three-phase voltage adaptive testing requires as three-phase negative/positive voltage unbalance factor is 2.0% and 4.0%.Imbalance of three-phase voltage adaptability of the present invention is also under electrical network provides the prerequisite of rated voltage, and the deviation voltage △ U exported by superposition power converter realizes imbalance of three-phase voltage adaptive testing requirement.
Imbalance of three-phase voltage adaptability of the present invention is implemented as follows:
Before test, closed input circuit breaker Q
i, export circuit breaker Q
owith by-pass switch S
bP, all the other all switches are all in off-state, and test system is powered by actual electric network, wait to be tested.
After meeting test condition, closed first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
bP, test system is powered by simulating grid, starts test.Rated voltage U1 is provided by the former limit of series transformer to test system by electrical network, then by controlling a power converter wherein phase or two-phase output voltage deviation-△ U
a/-△ U
b/-△ U
cor-△ is U
awith-△ U
b/-△ U
bwith-△ U
c/-△ U
cwith-△ U
adeviation voltage is coupled to former limit through series transformer secondary, electrical network rated voltage U1 superposes series transformer coupling deviation voltage value, is met the test request that tri-phase unbalance factor is 2.0% and 4.0%, tests afterwards according to the three-phase imbalance adaptive testing step specified in standard.
After having tested, closes bypass switch S
bP, disconnect the first function change-over switch S1 and the second function change-over switch S2.
3, flickering adaptability:
According to grid adaptability relevant criterion, flickering adaptive testing requires that flickering value is more than or equal to 1.Flickering adaptability of the present invention is also under electrical network provides the prerequisite of rated voltage, and the deviation voltage exported by superposition power converter and change voltage fluctuation frequency realize flickering adaptive testing requirement.
Flickering adaptability of the present invention is specifically implemented as follows:
Before test, closed input circuit breaker Q
i, export circuit breaker Q
owith by-pass switch S
bP, all the other all switches are all in off-state, and test system is powered by actual electric network, wait to be tested.
After meeting test condition, closed first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
bP, test system is powered by simulating grid, starts test.Rated voltage U1 is provided by the former limit of series transformer to test system by electrical network, again by controlling power converter output voltage deviate ± △ U and voltage fluctuation frequency f, voltage deviation value ± △ U and voltage fluctuation frequency f are coupled to former limit through series transformer secondary, electrical network rated voltage U1 superposes series transformer coupled voltages deviate ± △ U and voltage fluctuation frequency f, meeting test system input terminal voltage (U1 ± △ U) take vibration frequency as the test request that f carries out changing, and tests afterwards according to the flickering adaptive testing step specified in standard.
After having tested, closes bypass switch S
bP, disconnect the first function change-over switch S1 and the second function change-over switch S2.
4, harmonic voltage adaptability:
According to grid adaptability relevant criterion, harmonic voltage adaptive testing require to arrange voltage total harmonic distortion factor and arrange each harmonic (2 ~ 25 times, but wherein 3 doubly for several times except) voltage containing ratio is designated value.Harmonic voltage adaptability of the present invention is under electrical network provides the prerequisite of fundamental voltage, exports by superposition power converter the harmonic voltage adaptive testing requirement that each harmonic voltage meets total harmonic distortion factor or each harmonic containing ratio.
Harmonic voltage adaptability of the present invention is implemented as follows:
Before test, closes bypass switch S
bP, input circuit breaker Q
iwith output circuit breaker Q
o, all the other all switches are all in off-state, and test system is powered by actual electric network, wait to be tested.
After meeting test condition, closed first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
bP, test system is powered by simulating grid, starts test.Fundamental voltage U1 is provided by the former limit of series transformer to test system by electrical network, each harmonic voltage U n(n=2 ~ 25 are exported again by controlling power converter, but wherein 3 doubly for several times except), each harmonic voltage U n is coupled to former limit through series transformer secondary, electrical network fundamental voltage U1 superposes series transformer coupling each harmonic voltage U n, make test system input terminal voltage meet total harmonic distortion factor or each harmonic containing ratio, test according to the harmonic voltage adaptive testing step specified in standard afterwards.
After having tested, closes bypass switch S
bP, disconnect the first function change-over switch S1 and the second function change-over switch S2.
5, frequency adaptability
According to grid adaptability relevant criterion, during frequency adaptability test, mains frequency allows the low-limit frequency run to regulate to 50.5Hz at unit, and the step-length of frequency adjustment is 0.1Hz.Frequency adaptability of the present invention allows the low-limit frequency of operation to realize frequency adaptability test request to the frequency of 50.5Hz by controlling power converter output unit completely.
Frequency adaptability of the present invention is implemented as follows:
Before test, closes bypass switch S
bP, input circuit breaker Q
iwith output circuit breaker Q
o, all the other all switches are all in off-state, and test system is powered by actual electric network, wait to be tested
After meeting test condition, closed 3rd function change-over switch S3 and the 4th function change-over switch S4, bypass switch opens S
bP, test system is powered by simulating grid, starts test.Frequency adaptability test is realized by power converter completely, requiring to change within the scope of test frequency by controlling power converter output frequency, obtain frequency and the matching voltage of test request again through shunt transformer, test according to the frequency adaptability testing procedure specified in standard afterwards.
After having tested, closes bypass switch S
bP, disconnect the 3rd function change-over switch S3 and the 4th function change-over switch S4.
The present invention is not limited to above-mentioned embodiment, and when not deviating from flesh and blood of the present invention, any distortion that those skilled in the art can expect, improvement, replacement all fall into scope of the present invention.
Claims (10)
1. the grid-connected proving installation for wind-powered electricity generation and photovoltaic, it is characterized in that, described grid-connected proving installation comprises: power converter, series transformer, shunt transformer, input isolating switch, export isolating switch, protective breaker, first to fourth function change-over switch and by-pass switch and DSP control detecting unit, the input end of described grid-connected proving installation connects electrical network, output terminal connects as the wind power generating set of test system or photo-voltaic power generation station, the input end of described input isolating switch is connected to electrical network, the output terminal of described input isolating switch connects winding one end, series transformer former limit, and connect the input end of described protective breaker, the other end of described series transformer former limit winding connects the input end of the second function change-over switch, the output terminal of described second function change-over switch connects the input end exporting isolating switch, the output terminal of described output isolating switch is connected to test system, the output terminal of described protective breaker connects the input end of power converter, the output terminal of described power converter connects the input end of described first function change-over switch and the 3rd function change-over switch respectively, the output terminal of described first function change-over switch connects the vice-side winding of described series transformer, the output terminal of described 3rd function change-over switch connects the input end of described shunt transformer, the output terminal of described shunt transformer connects the input end of the 4th function change-over switch, the output terminal of described 4th function change-over switch is connected to the input end of described output isolating switch, described by-pass switch is connected across input isolating switch output terminal and exports isolating switch input end.
2. the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 1, it is characterized in that, described power converter is the converter topologies with energy in bidirectional flow.
3. the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 1, it is characterized in that, the deviation voltage that described power converter exports by described series transformer and harmonic voltage are coupled to transformer primary side by vice-side winding, described shunt transformer sends power converter output frequency to test system, simultaneously matching voltage grade.
4. the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 1, it is characterized in that, described first to fourth function change-over switch and by-pass switch are mechanical switch or electronic switch.
5. the method for testing for the grid-connected proving installation of wind-powered electricity generation and photovoltaic, use the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to any one of claim 1 to 4, the voltage adaptation of Wind turbines, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptability are tested.
6. the method for testing for the grid-connected proving installation of wind-powered electricity generation and photovoltaic, use the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to any one of claim 1 to 4, the voltage adaptation of photo-voltaic power generation station, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptability are tested.
7. the method for testing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 5 or 6, it is characterized in that, described first to fourth function change-over switch is for controlling described test voltage adaptability, imbalance of three-phase voltage adaptability, flickering adaptability, harmonic wave adaptability or test frequency adaptability; Described by-pass switch is for controlling actual electric network access or simulating grid access.
8. the method for testing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 5 or 6, it is characterized in that, in described voltage adaptation, three-phase imbalance adaptability and the adaptive test of flickering, there is provided rated voltage as reference voltage by access electrical network, control power converter device and export the deviation voltage meeting test request, by series transformer superposition rated voltage and deviation voltage, to realize voltage adaptation, three-phase imbalance adaptability and flickering adaptive testing requirement.
9. the method for testing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 5 or 6, in described harmonic voltage adaptive testing, there is provided fundamental voltage as reference voltage by access electrical network, control power converter device and export each harmonic voltage meeting test request, by series transformer superposition fundamental voltage and each harmonic voltage, to realize harmonic voltage adaptive testing requirement.
10. the method for testing of the grid-connected proving installation for wind-powered electricity generation and photovoltaic according to claim 5 or 6, it is characterized in that, in described frequency adaptability test, by controlling output frequency and the shunt transformer energy transferring of power converter, to realize the test request of frequency adaptability.
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| CN106291363A (en) * | 2016-09-26 | 2017-01-04 | 武汉承光博德光电科技有限公司 | The new forms of energy grid-connected test device of integration |
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