CN103064023A - Grid-tied testing device for wind electricity and photovoltaic energy and testing method thereof - Google Patents
Grid-tied testing device for wind electricity and photovoltaic energy and testing method thereof Download PDFInfo
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Abstract
The invention provides a grid-tied testing device for wind electricity and photovoltaic energy and a testing method thereof. The testing device comprises a power converter, a series connection transformer, a shunt transformer, an input breaker, an output breaker, a protective breaker, a first function change-over switch, a second function change-over switch, a third function change-over switch, a fourth function change-over switch, a by-pass switch and a digital signal processor (DSP) control and detection unit. An input end of the testing device is connected with a power grid, and an output end of the testing device is connected with a wind generating set or a photovoltaic generating station as a device to be tested. Deviation voltage or harmonic voltage output by the power converter and nominal voltage or fundamental voltage of the power grid are overlaid for achieving power grid adaptability requirements, and therefore the capacity of the power converter is far smaller than the rated capacity of the device to be tested. Due to the fact that the capacity of the power converter is reduced, the purposes that a system is low in cost, small in size, light in weight, small in heating value, high in reliability and the like can be achieved.
Description
Technical field
The invention belongs to the proving installation of grid-connected system in the new energy field, a kind of be incorporated into the power networks proving installation and method of testing thereof for wind-powered electricity generation and photovoltaic is provided especially, can satisfy the grid adaptability functional test of wind-powered electricity generation unit and photovoltaic plant.
Background technology
In recent years, the development of China Wind Power Generate, Generation, Generator volt power generating industry is rapid, and installed capacity is rapid growth year after year.For example, 2010, newly-increased 12904 of wind-powered electricity generation unit, installed capacity 18.93GW increases by 73.3% on a year-on-year basis, and the accumulative total installed capacity reaches 44.733GW, surpasses the U.S. and ranks first in the world, and has three wind-powered electricity generation device fabrication enterprises to enter world top ten.2011, Chinese photovoltaic product production capacity 30GW accounted for global production capacity 60%, several the worlds ten large photovoltaic enterprises was arranged all from China.At present, China national Bureau of Energy has announced " 12 " object of planning of Renewable Energy Development, and by 2015, the wind-electricity integration installed capacity will reach 100GW, produces energy 1,900 hundred million kilowatt hours per year; The photovoltaic generation installed capacity will reach 21GW, produce energy 25,000,000,000 kilowatt hours per year.
Meanwhile, a lot of problems have also appearred in Wind Power In China and photovoltaic operation: extensive blower fan off-grid event has repeatedly occured in China at present, such as on February 24th, 2011, cable fault appears in western the first wind energy turbine set of middle electric Jiuquan wind-powered electricity generation company bridge, cause three-phase shortcircuit, cause 16 wind energy turbine set, 598 typhoon group of motors off-grids.April 17, Guazhou County, Gansu synergism wind-powered electricity generation company dry river mouth west the second wind energy turbine set fault causes 702 unit off-grids of 15 wind energy turbine set, on the same day, also has an accident in body in Zhangjiakou Area, Hebei Province state Hua Jiaxin wind energy turbine set, and 644 typhoon group of motors off-grids, etc.Trace it to its cause, at 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 forms.But blower fan is poor to grid adaptability, is one of them major reason equally, and because the blower fan off-grid accident that the grid adaptability scarce capacity is caused also presents situation occurred frequently gradually.Aspect photovoltaic generation, because the solar energy power generating energy density is low, it is poor to stablize, regulating power is poor equally, generated energy is subjected to the impact of weather and region larger, also can be 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 move the sound development that the immense pressure of bringing to electricity net safety stable is restricting 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 of bringing to electrical network, guarantee the safety of system's setter and the reliability service of electrical network, at present, China has taked 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 consult on, requirement is carried out grid adaptability to grid-connected system and (is comprised voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and harmonic voltage adaptability) aptitude tests, also to satisfy simultaneously the technical requirement that the quality of power supply requires and is incorporated into the power networks.The adaptability that for this reason just need to test wind-powered electricity generation and photovoltaic parallel in system by special equipment simulating electric network fault situation.
For example, the patent documentation of application number 201120134815.0 discloses large capacity flexible grid-connected photovoltaic inverter detection platform, and this test platform comprises isolating transformer, and controllable direct current power supply is used to the input of inverter to be measured; The grid disturbance generating means; Many tap transformers; RLC load centralized control system; Wherein, inlet wire connects isolating transformer, and isolating transformer is output as the test bus, test bus branch by behind the isolating transformer as the input of controllable direct current power supply, transformer is surveyed in controllable direct current power supply output reception; Another branch disturbing generating device that gets access to grid after by the isolating transformer step-down, 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.
The patent documentation of application number 201010206913.0 discloses a kind of device for testing power grid adaptability of wind generator set, this device comprises the current transformer that makes up based on power semiconductor device, this current transformer input end connects three-phase supply, and output terminal connects wind power generating set.
The disclosed relevant grid adaptability proving installation of above-mentioned these patent documentations or be for the wind-powered electricity generation unit, or be for photovoltaic DC-to-AC converter, use single; And second patent adopts power converter to finish the total power test, and its volume is large, cost is high, also strengthens the manufacture difficulty of system, the dilatation of power-limiting current transformer.
Summary of the invention
The present invention is in view of described problem, a kind of be incorporated into the power networks proving installation and method of testing thereof for wind-powered electricity generation and photovoltaic is provided, and this device can satisfy the power grid adaptability of wind generator set test request, can satisfy again photo-voltaic power generation station grid adaptability test request, it is simple in structure, has very strong practicality.Simultaneity factor provides rated voltage and fundamental voltage etc. as reference voltage by the access electrical network, the deviation voltage △ U and the each harmonic voltage U n that utilize the power converter device to provide to satisfy test request.Therefore, proving installation capacity provided by the invention is far smaller than system's rated capacity, makes that its volume is little, cost is low, easy to manufacture.
The present invention is a kind of proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic; it is characterized in that; the described proving installation that is incorporated into the power networks comprises: power converter; series transformer; shunt transformer; the input isolating switch; the output isolating switch; protective breaker; first to fourth function change-over switch and by-pass switch and DSP control detecting unit; the input end of proving installation of being incorporated into the power networks connects electrical network; output terminal connects wind power generating set or the photo-voltaic power generation station as device to be measured; the input end of input isolating switch is connected to electrical network; the output terminal of input isolating switch connects the former limit of series transformer winding one end; the input end that connects simultaneously protective breaker; the other end of the former limit of series transformer 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 of output isolating switch; the output terminal of output isolating switch is connected to device to be measured; the output terminal of protective breaker connects the input end of power converter; the output terminal of power converter connects respectively the input end of the first function change-over switch and the 3rd function change-over switch; the output terminal of the first function change-over switch connects series transformer secondary 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 of output isolating switch, and by-pass switch is connected across input isolating switch output terminal and output isolating switch input end.
Be preferably, described power converter has the converter topologies of energy in bidirectional flow for all.
Be preferably, described series transformer arrives transformer primary side with deviation voltage and the harmonic voltage of power converter output by the secondary winding coupled, and described shunt transformer sends the power converter output frequency to device to be measured, realizes simultaneously voltage matches.
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 proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic, use the described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic, voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and the harmonic voltage adaptability of wind-powered electricity generation unit and photo-voltaic power generation station are tested.
Be preferably, first to fourth function change-over switch is used for control test voltage adaptability, imbalance of three-phase voltage adaptability, flickering adaptability, harmonic wave adaptability or test frequency adaptability; By-pass switch is used for the access of control actual electric network or simulating grid access.
Be preferably, in described voltage adaptation, three-phase imbalance adaptability and the adaptive test of flickering, provide rated voltage as reference voltage by the access electrical network, the power ratio control converter device provides the deviation voltage that satisfies test request, by series transformer stack 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, provide fundamental voltage as reference voltage by the access electrical network, the power ratio control converter device provides the each harmonic that satisfies test request voltage, by series transformer stack fundamental voltage and each harmonic voltage, to realize harmonic voltage adaptive testing requirement;
Be preferably, in described frequency adaptation property testing, by the output frequency of power ratio control current transformer, and the transmission of shunt transformer energy, 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 control detecting unit is used for power ratio control converter switches device, input circuit breaker Q
I, output circuit breaker Q
O, protective breaker Q
PAnd first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
BPWhile detection power current transformer input voltage, electric current, phase place, the input voltage of the dc voltage of power converter, electric current and device to be measured, electric current, phase place etc.According to detected value power ratio control converter switches device, output meets the voltage, frequency, harmonic wave of test request etc.
Described proving installation can be simulated the electrical network characteristic that comprises voltage, frequency, three-phase imbalance, voltage fluctuation and flickering, harmonic voltage, satisfies 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 with ground wire or with center line or with the three-phase system of 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 device average active power output to be measured respectively rated power 10%, 10%, 50%, 30%, more than 50%.
Proving installation of the present invention all is to 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 only provides deviation voltage or each harmonic voltage, as long as all capacity for power converter satisfy deviation voltage and each harmonic voltage needs capacity.
The frequency adaptability of proving installation of the present invention is the total power that test request is provided by power converter fully, so power converter must satisfy the power requirement of frequency adaptation property testing, i.e. and rated power more than 10%.
Comprehensive above grid adaptability measuring technology scheme is as long as the design power Converter Capacity satisfies in voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and the harmonic wave adaptive testing deviation voltage or the required capacity of each harmonic voltage and satisfies and reaches more than 10% of rated power in the frequency adaptation property testing in the proving installation of the present invention.Therefore, Capacity design for power converter can be far smaller than device rated capacity to be measured, be accompanied by the reduction of Converter Capacity, can bring a series of benefits thus, low such as cost, volume is little, lightweight, thermal value is little, reliability is high, this is for the Mobile Test Unit that is integrated in the container the inside, and the advantage of bringing is very huge.
For the described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic of an embodiment of the present invention, if grid adaptability dependence test standard has improved test rated power later on, the rated power that especially will reach during the frequency adaptation property testing, proving installation of the present invention only need to improve the rated power that the power converter design capacity reaches the frequency adaptability test request and get final product; Since in the technical solution of the present invention for the adaptive testing beyond the frequency adaptability, power converter only provides deviation voltage and each harmonic, so still do not lose the less advantage of power converter capacity, proving installation of the present invention is used for the wind-powered electricity generation unit of test or the restriction that photo-voltaic power generation station can not be subjected to capacity simultaneously, alleviate greatly power converter dilatation difficulty, enlarged its range of application.
Beneficial effect of the present invention is as follows:
1, the various characteristics of the present invention's energy simulating grid comprises voltage, frequency, three-phase imbalance, voltage fluctuation and the electrical network characteristics such as flickering, harmonic voltage, can satisfy wind-powered electricity generation and grid-connected grid adaptability test request.
As long as 2, the Capacity design of the power converter among the present invention satisfies in voltage adaptation, imbalance of three-phase voltage adaptability, flickering adaptability and the harmonic wave adaptive testing deviation voltage and the required capacity of each harmonic voltage and satisfies and reaches more than 10% of rated power in the frequency adaptation property testing.So the Capacity design of power converter can be far smaller than device rated capacity to be measured, be accompanied by the reduction of Converter Capacity, can bring a series of benefits thus, low such as cost, volume is little, lightweight, thermal value is little, reliability is high, this is for the Mobile Test Unit that is integrated in the container the inside, and the advantage of bringing is very huge.
3, according to the present invention, if grid adaptability dependence test standard has improved test rated power later on, the rated power that especially will reach during the frequency adaptation property testing, proving installation of the present invention only need to improve the rated power that the power converter design capacity reaches the frequency adaptability test request and get final product; Since in the technical solution of the present invention for the adaptive testing beyond the frequency adaptability, power converter only provides deviation voltage and each harmonic, so still do not lose the less advantage of power converter capacity, proving installation of the present invention is used for the wind-powered electricity generation unit of test or the limit value that photo-voltaic power generation station can not be subjected to capacity simultaneously, alleviate greatly power converter dilatation difficulty, enlarged its range of application.
Description of drawings
Fig. 1 is the structural drawing of the described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic of an embodiment of the present invention;
Fig. 2 is the principle of work block diagram that the DSP of the proving installation that is incorporated into the power networks of the described wind-powered electricity generation of an embodiment of the present invention and photovoltaic controls detecting unit;
Fig. 3 is the connection circuit figure of the described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic of an embodiment of the present invention.
Embodiment
Below, by reference to the accompanying drawings, the specific embodiment of the present invention is further specified.
An embodiment of the present invention is for being used for be incorporated into the power networks proving installation and the method for testing thereof of wind-powered electricity generation and photovoltaic, be illustrated in figure 1 as the structural drawing of the described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic of an embodiment of the present invention, the described proving installation that is incorporated into the power networks comprises power converter, series transformer, shunt transformer, input circuit breaker Q
I, output circuit breaker Q
O, protective breaker Q
PAnd first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
BPIts input end gets access to grid, and device is surveyed in output terminal reception, and device to be measured can be wind power generating set or photo-voltaic power generation station.The various characteristics of described proving installation energy simulating grid comprises voltage, frequency, three-phase imbalance, voltage fluctuation and the electrical network characteristics such as flickering, harmonic voltage, satisfies wind-powered electricity generation and grid-connected grid adaptability test request.
Power converter comprises all three-phases with energy in bidirectional flow or single-phase high voltage or low pressure converter topologies, three-phase system that forms such as three-phase four-quadrant current transformer, the many level current transformers of three-phase and by single-phase converter etc.Adopt any converter topologies to consider according to combined factors such as device electric pressure to be measured, installed capacities.
The former limit windings in series of series transformer is between electrical network and device to be measured, and the secondary winding is by the closed power converter output terminal that connects of the first function change-over switch S1.Series transformer is used for the deviation voltage of power converter output or each harmonic voltage are arrived former limit stack electrical network rated voltage through the secondary winding coupled, thereby change the operation of power networks parameter, simulating grid voltage deviation, imbalance of three-phase voltage, voltage fluctuation and flicker, harmonic voltage etc. are finished voltage adaptation in wind-powered electricity generation unit and the 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 the power converter outgoing side by the 3rd function change-over switch S3, and secondary is connected on the input side of output 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
BPBe used for the access of control actual electric network or simulating grid access, closes bypass switch S
BP, device to be measured is powered by actual electric network, is generally used for waiting for test condition; When satisfying test condition, bypass switch opens S
BP, entering test process, device to be measured is powered by simulating grid.
It is frequency adaptation property testing or other adaptive testings except frequency adapts to that first to fourth function change-over switch S1, S2, S3, S4 are used for control.Closed the 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, finish 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 stack electrical network rated voltage or fundamental voltage; Closed the 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, finish separately the frequency adaptation property testing 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 are all or part also can replace with electronic switch, such as solid-state switch, with semiconductor switch devices such as thyristor, GTO, IGBT, IGCT as its on-off element.
Be illustrated in figure 2 as the principle of work block diagram of the DSP control detecting unit of the described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic of an embodiment of the present invention, control module is as the core of control system hardware circuit, adopt high speed digital signal processor DSP TMS320F28335, utilize its high speed processing ability, High-Accuracy PWM output to realize that system is quick, accurate, the high precision operation, and utilize processor floating point processing unit accelerated procedure exploitation, reducing development cost.
DSP control detecting unit is used for power ratio control converter switches device, input circuit breaker Q
I, output circuit breaker Q
O, protective breaker Q
PAnd first to fourth function change-over switch S1, S2, S3, S4 and by-pass switch S
BPSimultaneously detection power current transformer input voltage, electric current, phase place, power converter dc voltage, electric current, and device input voltage to be measured, electric current, phase place etc.According to detected value power ratio control converter switches device, output meets the voltage, frequency, harmonic wave of test request etc.
Be incorporated into the power networks proving installation and method of testing thereof for wind-powered electricity generation and photovoltaic of the present invention, can satisfy simultaneously wind-powered electricity generation unit and photovoltaic plant and relate to gateway key index-grid adaptability functional test, wherein for voltage adaptation, the adaptive test of three-phase imbalance adaptability and flickering, provide rated voltage Ue as reference voltage by the access electrical network, the deviation voltage △ U of test request is satisfied in the output of power ratio control converter device, realizes voltage adaptation by series transformer stack rated voltage Ue and deviation voltage △ U, three-phase imbalance adaptability and flickering adaptive testing requirement.
Be incorporated into the power networks proving installation and method of testing thereof for wind-powered electricity generation and photovoltaic of the present invention, can satisfy simultaneously wind-powered electricity generation unit and photovoltaic plant and relate to gateway key index---grid adaptability functional test, wherein for the adaptive test of harmonic voltage, provide fundamental voltage U1 as reference voltage by the access electrical network, the each harmonic voltage U n of test request is satisfied in the output of power ratio control converter device, realizes harmonic wave adaptive testing requirement by series transformer stack fundamental voltage U1 and each harmonic voltage U n.
The present invention is a kind of proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic, can satisfy simultaneously wind-powered electricity generation unit and photovoltaic plant and relate to gateway key index-grid adaptability functional test, wherein for the frequency adaptation property testing, by power ratio control current transformer output frequency, thus and shunt transformer energy transmission realization frequency adaptability test request.
Being illustrated in figure 3 as the described proving installation connection circuit figure that is incorporated into the power networks for wind-powered electricity generation and photovoltaic of an embodiment of the present invention, is a kind of common three-phase three-wire system system.Proving installation of the present invention has also comprised with ground wire or with center line or with the three-phase system of ground wire and center line.
Followingly specify various grid adaptability test processs according to Fig. 3:
1, voltage adaptation:
According to the grid adaptability relevant criterion, during the voltage adaptation property testing, line voltage is regulated in 0.9p.u. ~ 1.4p.u, and the step-length of voltage adjustment is 1% of rated voltage.Voltage adaptation of the present invention is to provide under the prerequisite of rated voltage at electrical network, and the deviation voltage △ U by stack power converter output reaches device input voltage to be measured and regulate the requirement of realization voltage adaptation property testing 0.9p.u. ~ 1.4p.u scope in.
Voltage adaptation of the present invention is implemented as follows:
Before the test, closed input circuit breaker Q
I, output circuit breaker Q
OWith by-pass switch S
BP, all the other all switches all are in off-state, and device to be measured is powered by actual electric network, waits to be tested.
After satisfying test condition, closed the first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
BP, device to be measured is powered by simulating grid, begins test.Provide rated voltage U1 by the former limit of series transformer to device to be measured by electrical network, again by power ratio control current transformer output bias voltage △ U, deviation voltage △ U is coupled to former limit through the series transformer secondary, electrical network rated voltage U1 stack series transformer coupling deviation voltage △ U, thereby reach the requirement of regulating device input terminal voltage to be measured (U1 ± △ U), afterwards, test according to the voltage adaptation property testing step of stipulating in the standard.Wherein Δ U=0 ~ ± 0.4p.u., the step-length of △ U is 1% of rated voltage.
After test is finished, 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 the grid adaptability relevant criterion, it is that three-phase negative/positive Voltage unbalance degree is 2.0% and 4.0% that the imbalance of three-phase voltage adaptive testing requires.Imbalance of three-phase voltage adaptability of the present invention also is to provide under the prerequisite of rated voltage at electrical network, and the deviation voltage △ U that exports by the stack 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 the test, closed input circuit breaker Q
I, output circuit breaker Q
OWith by-pass switch S
BP, all the other all switches all are in off-state, and device to be measured is powered by actual electric network, waits to be tested.
After satisfying test condition, closed the first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
BP, device to be measured is powered by simulating grid, begins test.Provide rated voltage U1 by the former limit of series transformer to device to be measured by electrical network, pass through again wherein phase or a two-phase output voltage deviation-△ U of power ratio control current transformer
A/-△ U
B/-△ U
COr-△ U
AWith-△ U
B/-△ U
BWith-△ U
C/-△ U
CWith-△ U
ADeviation voltage is coupled to former limit through the series transformer secondary, electrical network rated voltage U1 stack series transformer coupling deviation voltage value is met tri-phase unbalance factor and is 2.0% and 4.0% test request, tests according to the three-phase imbalance adaptive testing step of stipulating in the standard afterwards.
After test is finished, 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 the grid adaptability relevant criterion, the flickering adaptive testing requires the flickering value more than or equal to 1.Flickering adaptability of the present invention also is to provide under the prerequisite of rated voltage at electrical network, and deviation voltage and the change voltage fluctuation frequency exported by the stack power converter realize flickering adaptive testing requirement.
Flickering adaptability implementation of the present invention is as follows:
Before the test, closed input circuit breaker Q
I, output circuit breaker Q
oWith by-pass switch S
BP, all the other all switches all are in off-state, and device to be measured is powered by actual electric network, waits to be tested.
After satisfying test condition, closed the first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
BP, device to be measured is powered by simulating grid, begins test.Provide rated voltage U1 by the former limit of series transformer to device to be measured by electrical network, again by power ratio control current transformer output voltage deviate ± △ U and voltage fluctuation frequency f, voltage deviation value ± △ U and voltage fluctuation frequency f are coupled to former limit through the series transformer secondary, electrical network rated voltage U1 stack series transformer coupled voltages deviate ± △ U and voltage fluctuation frequency f, satisfy the test request that device input terminal voltage to be measured (U1 ± △ U) changes take vibration frequency as f, test according to the flickering adaptive testing step of stipulating in the standard afterwards.
After test is finished, 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 the grid adaptability relevant criterion, the harmonic voltage adaptive testing require to arrange the total percent harmonic distortion of voltage and arrange each harmonic (2 ~ 25 times, but wherein 3 doubly for several times except) the voltage containing ratio is designated value.Harmonic voltage adaptability of the present invention is to provide under the prerequisite of fundamental voltage at electrical network, satisfies the harmonic voltage adaptive testing requirement of total percent harmonic distortion or each harmonic containing ratio by stack power converter output each harmonic voltage.
Harmonic voltage adaptability of the present invention is implemented as follows:
Before the test, closes bypass switch S
BP, the input circuit breaker Q
IWith the output circuit breaker Q
o, all the other all switches all are in off-state, and device to be measured is powered by actual electric network, waits to be tested.
After satisfying test condition, closed the first function change-over switch S1 and the second function change-over switch S2, bypass switch opens S
BP, device to be measured is powered by simulating grid, begins test.Provide fundamental voltage U1 by the former limit of series transformer to device to be measured by electrical network, again by power ratio control current transformer output each harmonic voltage U n(n=2 ~ 25, but wherein except 3 the doubly several), each harmonic voltage U n is coupled to former limit through the series transformer secondary, electrical network fundamental voltage U1 stack series transformer coupling each harmonic voltage U n, so that device input terminal voltage to be measured satisfies total percent harmonic distortion or each harmonic containing ratio, test according to the harmonic voltage adaptive testing step of stipulating in the standard afterwards.
After test is finished, 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 the grid adaptability relevant criterion, during the frequency adaptation property testing, mains frequency allows the low-limit frequency of operation to regulate to the 50.5Hz scope at unit, and the step-length of frequency adjustment is 0.1Hz.Frequency adaptability of the present invention is to allow the low-limit frequency of operation to the frequency realization frequency adaptability test request of 50.5Hz by power ratio control current transformer output unit fully.
Frequency adaptability of the present invention is implemented as follows:
Before the test, closes bypass switch S
BP, the input circuit breaker Q
IWith the output circuit breaker Q
o, all the other all switches all are in off-state, and device to be measured is powered by actual electric network, waits to be tested
After satisfying test condition, closed the 3rd function change-over switch S3 and the 4th function change-over switch S4, bypass switch opens S
BP, device to be measured is powered by simulating grid, begins test.The frequency adaptation property testing is to be realized by power converter fully, change in requiring the test frequency scope by power ratio control current transformer output frequency, obtain again frequency and the matching voltage of test request through shunt transformer, test according to the frequency adaptability testing procedure of stipulating in the standard afterwards.
After test is finished, 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 in the situation that does not deviate 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 (9)
1. proving installation that is incorporated into the power networks that is used for wind-powered electricity generation and photovoltaic; it is characterized in that; the described proving installation that is incorporated into the power networks comprises: power converter; series transformer; shunt transformer; the input isolating switch; the output isolating switch; protective breaker; first to fourth function change-over switch and by-pass switch and DSP control detecting unit; the input end of the described proving installation that is incorporated into the power networks connects electrical network; output terminal connects wind power generating set or the photo-voltaic power generation station as device to be measured; the input end of described input isolating switch is connected to electrical network; the output terminal of described input isolating switch connects the former limit of series transformer winding one end; and connect the input end of described protective breaker; the other end of the former limit of described series transformer winding connects the input end of the second function change-over switch; the output terminal of described the second function change-over switch connects the input end of output isolating switch; the output terminal of described output isolating switch is connected to device to be measured; the output terminal of described protective breaker connects the input end of power converter; the output terminal of described power converter connects respectively the input end of described the first function change-over switch and the 3rd function change-over switch; the output terminal of described the first function change-over switch connects the secondary winding of described series transformer; the output terminal of described the 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 the 4th function change-over switch is connected to the input end of described output isolating switch, and described by-pass switch is connected across input isolating switch output terminal and output isolating switch input end.
2. the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 1 is characterized in that, described power converter is the converter topologies with energy in bidirectional flow.
3. the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 1, it is characterized in that, described series transformer arrives transformer primary side with deviation voltage and the harmonic voltage of described power converter output by the secondary winding coupled, described shunt transformer sends the power converter output frequency to device to be measured, simultaneously the matching voltage grade.
4. the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 1 is characterized in that, described first to fourth function change-over switch and by-pass switch are mechanical switch or electronic switch.
5. method of testing that is used for the proving installation that is incorporated into the power networks of wind-powered electricity generation and photovoltaic, right to use requires 1 to the 5 described proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic, and voltage adaptation, frequency adaptability, imbalance of three-phase voltage adaptability, flickering adaptability and the harmonic voltage adaptability of wind-powered electricity generation unit and photo-voltaic power generation station are tested.
6. the method for testing of the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 5, it is characterized in that described first to fourth function change-over switch is used 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 used for the access of control actual electric network or simulating grid access.
7. the method for testing of the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 5, it is characterized in that, in described voltage adaptation, three-phase imbalance adaptability and the adaptive test of flickering, provide rated voltage as reference voltage by the access electrical network, the deviation voltage of test request is satisfied in the output of power ratio control converter device, by series transformer stack rated voltage and deviation voltage, to realize voltage adaptation, three-phase imbalance adaptability and flickering adaptive testing requirement.
8. the method for testing of the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 5, in described harmonic voltage adaptive testing, provide fundamental voltage as reference voltage by the access electrical network, the each harmonic voltage of test request is satisfied in the output of power ratio control converter device, by series transformer stack fundamental voltage and each harmonic voltage, to realize harmonic voltage adaptive testing requirement.
9. the method for testing of the proving installation that is incorporated into the power networks for wind-powered electricity generation and photovoltaic according to claim 5, it is characterized in that, in described frequency adaptation property testing, by output frequency and the transmission of shunt transformer energy of power ratio control current transformer, to realize the test request of frequency adaptability.
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