CN204287354U - The device of high-power low voltage crossing test is realized based on low capacity electrical network - Google Patents
The device of high-power low voltage crossing test is realized based on low capacity electrical network Download PDFInfo
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- CN204287354U CN204287354U CN201420794015.5U CN201420794015U CN204287354U CN 204287354 U CN204287354 U CN 204287354U CN 201420794015 U CN201420794015 U CN 201420794015U CN 204287354 U CN204287354 U CN 204287354U
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Abstract
The utility model discloses a kind of device realizing the test of high-power low voltage crossing based on low capacity electrical network, comprise main circuit and feedback circuit, described main circuit comprises the frequency converter, motor, generator, wind electric converter and the electrical network that connect successively and falls analog platform, and described main circuit is by mains supply; Described frequency converter comprises the first rectifier and the first inverter that connect successively along direction of current, and described wind electric converter comprises the second rectifier and the second inverter that connect successively along direction of current; Described feedback circuit is for receiving the electric current of blower fan conveying and entering in electrical network or main circuit feedback after its conversion.The utility model replaces original crowbar resistance by used up for active power mode, the active power that blower fan is carried is feedbacked by certain mode, not only can be used in Large Copacity electrical network and reduce energy consumption, can also be used in the low capacity electrical network in laboratory and be used for realizing high-power wind turbine low voltage crossing experimental test.
Description
Technical field
The utility model belongs to wind-powered electricity generation low voltage crossing experimental technique field, especially relates to a kind of device realizing the test of high-power low voltage crossing based on low capacity electrical network.
Background technology
China's Wind Power Development has a extensive future: the developable wind resource in land has 2.53 hundred million kilowatts, in Future Ten year at least, and multiple ten million multikilowatt wind power base will be built in the inlands such as northwest, northeast, Inner Mongol; The wind resource in China coastal seas region development reserves can have 7.5 hundred million kilowatts, and the potentiality of development offshore wind farm are very large, and in Shanghai, Jiangsu, the provinces and cities coastal waters such as Shandong only just have more than 10 marine wind electric field to start to build for 2010-2011 years.According to the planning of National Energy Board, expect the year two thousand twenty, China's wind-power electricity generation installation total volume will account for 15% of national total installation of generating capacity.
Along with wind-power electricity generation proportion in electric power energy is increasing, wind generator system can not be ignored the impact of electrical network.Especially China's wind-powered electricity generation is concentrated on a large scale to the mode of access, when grid collapses causes grid-connected point voltage to fall, once the automatic off-grid of Wind turbines may cause the collapse of line voltage and frequency, have a strong impact on the safe and stable operation of electrical network, the application of this clean energy resource of wind-power electricity generation is restricted.Therefore, the Wind turbines that large-scale grid connection is run must have low voltage ride-through capability (Low Voltage Ride Through, LVRT).Wind turbines is grid-connected must meet corresponding technical standard, and only have when grid voltage sags just allows aerogenerator off-grid lower than regulation curve later, when magnitude of voltage sunk part, generator should provide reactive power.
At present, the low voltage ride-through capability of Wind turbines has all been related in the wind-electricity integration criterion that American-European countries formulates.China is about to also carry out specified in more detail (as shown in Figure 1) to the low voltage ride-through capability of the Wind turbines be incorporated into the power networks in the GB " wind energy turbine set access power system technology specifies " of promulgating. but, current domestic test and means of testing scarcity, still can not develop the portable low voltage crossing proving installation matched with technical standard, the equal dependence on import of main testing apparatus, be difficult to for the grid connection test of wind energy turbine set provides effective technical support, also seriously restrict the development of China's wind-power electricity generation.When carrying out the test of wind-powered electricity generation low voltage crossing at present, because electrical network falls, the active power that blower fan is carried can not be connected to the grid, take certain measure the active power that blower fan is carried to be discharged, the measure generally taked adopts discharge resistance (crowbar resistance) active power that blower fan is carried to be consumed.Due to when wind-powered electricity generation low voltage crossing is tested, except consuming the active power of blower fan conveying by every means, also to require to carry certain reactive power to electrical network according to Voltage Drop simultaneously, supporting line voltage and recover.If do the test of high-power wind turbine low voltage crossing in this manner, then electrical network is necessarily required to have enough large power and capacity.Existing low voltage crossing test method front end electrical network connects the electrical network of Large Copacity electrical network but not use for laboratory, the power needed when Large Copacity electrical network can provide high-power wind power converter low voltage crossing to test, and the net capacity of use for laboratory is general all little, the power demand during test of MW class large power wind electric converter low voltage crossing cannot be met.
Summary of the invention
For solving the problem, the utility model discloses a kind of device realizing the test of high-power low voltage crossing based on low capacity electrical network, replace original crowbar resistance by used up for active power mode, the active power that blower fan is carried is feedbacked by certain mode, and original control mode is constant.
In order to achieve the above object, the utility model provides following technical scheme:
A kind of device realizing the test of high-power low voltage crossing based on low capacity electrical network, comprise main circuit and feedback circuit, described main circuit comprises the frequency converter, motor, generator, wind electric converter and the electrical network that connect successively and falls analog platform, and described main circuit is by mains supply; Described frequency converter comprises the first rectifier and the first inverter that connect successively along direction of current, and described wind electric converter comprises the second rectifier and the second inverter that connect successively along direction of current; Described feedback circuit is for receiving wind electric converter for receiving the electric current of blower fan conveying and entering in electrical network or main circuit feedback after its conversion.
Further, the described feedback circuit other end is connected with electrical network, and feedback circuit comprises the DC-DC converter and the 3rd inverter that connect successively along direction of current.
Further, described electrical network is low capacity electrical network.
Further, in described feedback circuit other end access frequency converter, feedback circuit comprises DC-DC converter.
Further, the described feedback circuit other end connects electrical network and falls analog platform, and feedback circuit comprises DC-DC converter.
Further, described feedback circuit one end is accessed between the second inverter and the second rectifier.
Compared with prior art, the utility model tool has the following advantages and beneficial effect:
The power of the utility model device blower fan conveying when carrying out low voltage crossing is adopted to can be good at feeding back in electrical network or original circuit, in whole process of the test, electrical network only provides an equipment running wastage, save energy loss, reduce the power that electrical network needs to export, thus in whole low voltage crossing process of the test, electrical network only provides equipment operating power attenuation.Make this device not only can be used in Large Copacity electrical network by the way and reduce energy consumption, can also be used in the low capacity electrical network in laboratory and be used for realizing high-power wind turbine low voltage crossing experimental test, do under powered problem when high-power wind turbine low voltage crossing is tested under efficiently solving low capacity grid conditions, be convenient in laboratory or workshop low capacity electrical network, carry out high-power wind turbine converter plant research and development and detection.
Accompanying drawing explanation
Fig. 1 is wind electric converter low voltage test typical curve schematic diagram;
The apparatus structure schematic diagram realizing the test of high-power low voltage crossing based on low capacity electrical network that Fig. 2 provides for embodiment one;
The apparatus structure schematic diagram realizing the test of high-power low voltage crossing based on low capacity electrical network that Fig. 3 provides for embodiment one;
The apparatus structure schematic diagram realizing the test of high-power low voltage crossing based on low capacity electrical network that Fig. 4 provides for embodiment one.
Embodiment
Below with reference to specific embodiment, the technical scheme that the utility model provides is described in detail, following embodiment should be understood and be only not used in restriction scope of the present utility model for illustration of the utility model.
Embodiment one:
Fig. 2 is the first apparatus structure schematic diagram of high-power low voltage crossing test under adopting the utility model thinking to carry out low capacity electrical network, it comprises main circuit and feedback circuit, main circuit comprises the frequency converter comprising the first rectifier and the first inverter, motor, generator, the wind electric converter comprising the second rectifier and the second inverter, the electrical network that connect successively and falls analog platform, and described main circuit is by low capacity mains supply.Described feedback circuit one end connects in wind electric converter, other end access low capacity electrical network, specifically, described feedback circuit comprises DC-DC converter and the 3rd inverter, DC-DC converter input end is connected with the second inverter output end, DC-DC converter output terminal is connected with the 3rd inverter input terminal, and the 3rd inverter exports electric energy to low capacity electrical network.
The test method of said apparatus is as follows:
The alternating current that low capacity electrical network exports (first converts alternating current to direct current by the first rectifier through frequency converter frequency conversion, by the first inverter, direct current is converted to alternating current again) after be supplied to current/voltage required for motor, motor driven generator exports electric energy, the electric current that generator exports (first converts alternating current to direct current by the second rectifier through wind electric converter unsteady flow, by the second inverter, direct current is converted to alternating current again) afterwards modeling wind field blower fan generate electricity and be connected to electrical network and fall analog platform, electrical network falls analog platform by low capacity mains supply, the situation that this platform simulation electrical network falls, carry out the test of wind-powered electricity generation low voltage crossing.(by the 3rd inverter conversion after DC-DC converter conversion DC voltage) after the power conversion of the wind field blower fan of simulation conveying well feeds back in electrical network by feedback circuit.
Embodiment two:
Fig. 3 is the second apparatus structure schematic diagram of high-power low voltage crossing test under adopting the utility model thinking to carry out low capacity electrical network, it comprises main circuit and feedback circuit, main circuit comprises frequency converter, motor, generator, wind electric converter and electrical network and falls analog platform, and described main circuit is by low capacity mains supply.Same, frequency converter comprises the first rectifier and the first inverter, and wind electric converter comprises the second inverter and the second rectifier.Between the first rectifier that described feedback circuit one end connects wind electric converter, the other end accesses frequency converter and the first inverter, described feedback circuit comprises DC-DC converter, DC-DC converter input end is connected with the second inverter output end, and DC-DC converter output terminal is connected with the first inverter input terminal.
The test method of said apparatus is as follows:
The alternating current that low capacity electrical network exports is supplied to the current/voltage required for motor after frequency converter frequency conversion, motor driven generator exports electric energy, the electric energy that generator exports is connected to electrical network after the generating of modeling wind field blower fan and falls analog platform after wind electric converter effect, electrical network falls the situation that analog platform simulating grid falls, and carries out the test of wind-powered electricity generation low voltage crossing.The current feedback of the wind field blower fan of simulation conveying can be given the direct current component dragging frequency converter by feedback circuit, thus supply motor electric energy.
Embodiment three:
Fig. 4 is the third apparatus structure schematic diagram of high-power low voltage crossing test under adopting the utility model thinking to carry out low capacity electrical network, it comprises main circuit and feedback circuit, main circuit comprises frequency converter, motor, generator, wind electric converter and electrical network and falls analog platform, and described main circuit is by low capacity mains supply.Same, frequency converter comprises the first rectifier and the first inverter, and wind electric converter comprises the second inverter and the second rectifier.Described feedback circuit comprises DC-DC converter, and described feedback circuit one end connects wind electric converter, other end access electrical network falls in analog platform.
The test method of said apparatus is as follows:
The alternating current that low capacity electrical network exports is supplied to the current/voltage required for motor after frequency converter frequency conversion, motor driven generator exports electric energy, the electric energy that generator exports is connected to electrical network after the generating of modeling wind field blower fan and falls analog platform after wind electric converter effect, electrical network falls the situation that analog platform simulating grid falls, and carries out the test of wind-powered electricity generation low voltage crossing.Back electrical energy to the electrical network that the wind field blower fan of simulation is carried can be fallen the direct current component of falling device in analog platform by feedback circuit, allows energy temporarily obtain loop, waits during voltage resume and feed back to electrical network.
Rectifier in above-described embodiment one ~ embodiment three and inverter all realize the two-way flow of energy by control strategy, in whole process of the test, do not have power loss except the running wastage of equipment, and the running wastage of equipment is provided by laboratory electrical network.
It must be noted that, though the electrical network in above-described embodiment one to three is low capacity electrical network, but the utility model still can be applied in Large Copacity electrical network, in Large Copacity electrical network, power is higher, operational process comparatively low capacity electrical network is more stable, and a large amount of energy consumption can be saved in the basis utilizing the utility model device.
Technological means disclosed in the utility model scheme is not limited only to the technological means disclosed in above-mentioned embodiment, also comprises the technical scheme be made up of above technical characteristic combination in any.It should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle, can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (6)
1. one kind realizes the device of high-power low voltage crossing test based on low capacity electrical network, it is characterized in that: comprise main circuit and feedback circuit, described main circuit comprises the frequency converter, motor, generator, wind electric converter and the electrical network that connect successively and falls analog platform, and described main circuit is by mains supply; Described frequency converter comprises the first rectifier and the first inverter that connect successively along direction of current, and described wind electric converter comprises the second rectifier and the second inverter that connect successively along direction of current; Described feedback circuit is for receiving the electric current of blower fan conveying and entering in electrical network or main circuit feedback after its conversion.
2. the device realizing the test of high-power low voltage crossing based on low capacity electrical network according to claim 1, it is characterized in that: the described feedback circuit other end is connected with electrical network, feedback circuit comprises the DC-DC converter and the 3rd inverter that connect successively along direction of current.
3. the device realizing the test of high-power low voltage crossing based on low capacity electrical network according to claim 2, is characterized in that: described electrical network is low capacity electrical network.
4. the device realizing the test of high-power low voltage crossing based on low capacity electrical network according to claim 1, is characterized in that: in described feedback circuit other end access frequency converter, feedback circuit comprises DC-DC converter.
5. the device realizing the test of high-power low voltage crossing based on low capacity electrical network according to claim 1, is characterized in that: the described feedback circuit other end connects electrical network and falls analog platform, and feedback circuit comprises DC-DC converter.
6., according to the device realizing the test of high-power low voltage crossing based on low capacity electrical network in Claims 1 to 5 described in any one claim, it is characterized in that: described feedback circuit one end is accessed between the second inverter and the second rectifier.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459410A (en) * | 2014-12-16 | 2015-03-25 | 南京中认南信检测技术有限公司 | Device and method for achieving high-power low voltage ride through test based on small-capacity power grid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459410A (en) * | 2014-12-16 | 2015-03-25 | 南京中认南信检测技术有限公司 | Device and method for achieving high-power low voltage ride through test based on small-capacity power grid |
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