CN202003012U - Novel mobile modularized multi-functional MW-level low voltage ride-through capability detector - Google Patents
Novel mobile modularized multi-functional MW-level low voltage ride-through capability detector Download PDFInfo
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- CN202003012U CN202003012U CN2011200758020U CN201120075802U CN202003012U CN 202003012 U CN202003012 U CN 202003012U CN 2011200758020 U CN2011200758020 U CN 2011200758020U CN 201120075802 U CN201120075802 U CN 201120075802U CN 202003012 U CN202003012 U CN 202003012U
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Abstract
The utility model relates to a novel mobile modularized multi-functional MW-level low voltage ride-through capability detector which comprises a circuit breaker container, a stepdown transformer container, a power unit container and a boosting transformer container, wherein primary loops among the containers are connected by high-voltage cables, and signal wires between the containers are directly connected by a rectangular connector. The detector has the benefits of being capable of completing test on the low voltage ride-through capability and the voltage/frequency disturbance response characteristic of large and medium-sized photovoltaic power stations and wind generator sets, and has the characteristics of being mobile, having a modularized structure and integrating multiple functions.
Description
Technical field
The utility model relates to a kind of device that is used to realize the low voltage ride-through capability detection, especially relates to a kind of new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit.
Background technology
In recent years, China supports development generation of electricity by new energy technology just energetically, along with the quick increase of solar energy power generating and wind-power electricity generation installation ratio, electric system has proposed requirement to the big-and-middle-sized photovoltaic plant that inserts electrical network and the wind power generating set service ability when the electrical network generation transient state fault.State Grid Corporation of China's " photovoltaic plant inserts the electric power network technique regulation " and " wind energy turbine set inserts the electric power network technique regulation " explicitly call for big-and-middle-sized photovoltaic plant and wind power generating set must possess low voltage ride-through capability (LVRT, Low Voltage Ride-Through).
Existing low voltage ride-through capability pick-up unit mainly contains based on reactor with based on two kinds of implementations of transformer.Adopt the scheme that makes up reactor stepping switching based on reactor form LVRT pick-up unit, as shown in Figure 1, by current-limiting impedance
Form with earthing reactor X2.Earthing reactor can be realized by the series connection of the reactor of tap more than many, test point voltage is produced fall, and controls the degree of depth of electric voltage dropping by the value of control earthing reactor.Current limiting reactor is used for being maintained the PCC point voltage, and the PCC point voltage falls and is controlled within the allowed band in the time of will detecting.The low voltage ride-through capability pick-up unit that adopts this method to realize, structure is comparatively simple, but because power is flow through in reactance when electric voltage dropping, therefore must select powerful reactor, and device volume is very big.On the other hand because electric network impedance
The existence of sys, the PCC point produces electric voltage dropping during detection, and line voltage is exerted an influence.And because the switching of reactance value fixes, cause the electric voltage dropping degree of depth can not be adjustable continuously, recovery curve be stepped appearance.
The low voltage ride-through capability pick-up unit of transformer form has 2 classes: (1) adopts relay with transformers connected in parallel or be connected in series in the main circuit, realizes electric voltage dropping; (2) utilize center tap to switch the realization electric voltage dropping mutually at the transformer secondary.When adopting the transformers connected in parallel mode, wherein 1 transformer malfunction that will be operated in the secondary shorted to earth could realize electric voltage dropping, and this requires it to have stronger anti-current impact capacity.In addition, there is the nonadjustable shortcoming of the electric voltage dropping degree of depth in this scheme.And the low voltage ride-through capability pick-up unit design technology complexity of centre-tapped transformer form is difficult for realizing.In addition, be subjected to the restriction of switching device, the low voltage ride-through capability pick-up unit of transformer form, the electric voltage dropping time can't accurately be controlled, and when power was big, volume of transformer and weight were all very big, cause the inconvenience of installing and using.
Summary of the invention
The purpose of this utility model is: the low-voltage of existing reactor form and transformer form is passed through the problem that exists in the proving installation technology: (1) volume is big; (2) point voltage that is incorporated into the power networks is exerted an influence; (3) the electric voltage dropping degree of depth can not be regulated continuously, and recovery curve is stepped appearance; (4) electric voltage dropping time and to fall precision uncontrollable; (5) twice test interval are longer.At the problems referred to above, the low-voltage that the utility model proposes a kind of new mobile type modular multi-function is passed through detection technique, in order to the low voltage ride-through capability of finishing big-and-middle-sized photovoltaic plant and wind power generating set and the test of voltage/frequency response characteristic.
In order to realize the foregoing invention purpose, the utility model adopts following technical scheme.
Composition comprises: isolating switch container, step-down transformer container, power cell container and step-up transformer container.Primary circuit between each container is connected by high-tension cable, and signal wire directly links to each other by rectangular connector between case and the case.
Overall performance is: can comprise the various types of electric voltage dropping faults of power grid single-phase short circuit, line to line fault and three-phase shortcircuit and the disturbance of line voltage/frequency by real simulation, can control easily and fall type, fall the duration, fall the degree of depth and fall phase place, curve of output realization able to programme, and the power feed-in electrical network that the power station is sent.Device can detect with interior power cell capacity 1.5MW, and the input/output voltage grade is 10kV, 20kV and 35kV.Possess the ability with distant place upper machine communication, can upload/download each switching value and analog quantity, accurately simulate all kinds of experiment test curves that tele-control system issues.
The isolating switch container is for providing connecting interface between pick-up unit and power station and electrical network.Built-in input isolating switch, output isolating switch, cable drum, measurement high precision PT/CT and complex protection device.Cable drum institute download cable is used for connecting electrical network and input isolating switch, tested power station and output isolating switch respectively.
The step-down transformer container is finished the conversion of electrical network rated voltage to the specified input voltage of power cell.Built-in step-down transformer and cable drum.Step-down transformer reduces the back with voltage to be used for the power cell container, and cable drum institute download cable is used for connecting step-down transformer and input isolating switch.
The power cell container adopts the high voltage converter scheme, can the various types of electric voltage dropping fault of real simulation and the disturbance of voltage/frequency, and can control easily and fall type, fall the duration, fall the degree of depth and fall phase place.Built-in H bridging frequently many level of power cell series electrical potential source type four-quadrant high voltage converter, split phase transformer and switch board.But aanalogvoltage falls functions such as fault, voltage/frequency disturbance, unbalanced source voltage, voltage ripple of power network and harmonic wave stack output.
The step-up transformer container is finished the conversion of the specified input voltage of power cell to the electrical network rated voltage.Built-in step-down transformer and cable drum.Step-up transformer is connected to the output isolating switch after voltage is raise.Cable drum institute download cable is used for connecting step-up transformer and output isolating switch.
The new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit that the utility model provides can be finished low voltage ride-through capability test and the test of voltage/frequency response characteristic.The scheme of adopt high voltage converter, being furnished with many taps input and output transformer is a carrier with 4 twenty equivalent units.
The beneficial effects of the utility model are to finish the low voltage ride-through capability and the characteristic test of voltage/frequency disturbance response of big-and-middle-sized photovoltaic plant and wind power generating set, and having mobility, modular construction, multiple function is the characteristics of one.This device passes through proving installation with the low-voltage of transformer form and compares with having the reactor form now, and following beneficial effect is arranged:
1) less compared to traditional combination reactor system volume;
Do not consider net side impedance factors when 2) detecting, line voltage is not had influence substantially;
3) adopt power electronics to control device entirely, curve of output is able to programme, and electric voltage dropping and rejuvenation are level and smooth, the control accuracy height.Can control the electric voltage dropping type easily, fall the duration, fall the degree of depth and fall phase place.
4) possesses function simultaneously, voltage-regulation scope: 0 to 1.35 times of rated voltage, frequency-tuning range: 45～55Hz to low voltage ride-through capability and the characteristic test of voltage/frequency disturbance response.
5) device heating problem when reactor need not considered to move can be tested continuously, has improved testing efficiency.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the low voltage ride-through capability pick-up unit schematic diagram based on the reactor form.
Fig. 2 is the utility model " new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit " electrical diagram.
Fig. 3 is the utility model primary circuit wiring diagram.
Fig. 4 is the utility model secondary circuit wiring diagram.
Embodiment
The new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit of present embodiment as shown in Figure 2, its composition comprises isolating switch container, step-down transformer container, power cell container and step-up transformer container.
Below in conjunction with embodiment main each function of this device is described (seeing Fig. 2, Fig. 3 and Fig. 4).
As shown in Figure 2, tested electric station grid connection main breaker disconnects operation, and the primary circuit of low voltage ride-through capability detection test as shown in Figure 3.Tested electric station grid connection point passes through route isolating switch connection device, and links to each other with the step-down transformer container by the 35kV cable.Through casing by 3kV cable ingoing power collection of units after the step-down change step-down.The power cell container outlet is connected with step-up transformer, passes through pick-up unit outlet isolating switch by 35kV cable and low-voltage again after becoming through boosting and docks, and the outlet isolating switch links to each other with tested power station by the 35kV cable.The ground wire that low-voltage is passed through four containers of pick-up unit links to each other in twos, and by power cell container ground connection.
The secondary circuit of low voltage ride-through capability detection test as shown in Figure 4.The power cell container from the scene, power station or the emergency power pack car get the 380V electricity consumption, the dispensing low-voltage is passed through 4 container secondaries electricity consumption of pick-up unit.
4 container communication signals that a whole set of low-voltage is passed through pick-up unit are linked to each other with remote control table by the power cell case or pass through the wireless network transmissions signal, and signal wire directly links to each other by rectangular connector between case and the case.
During detection, input isolating switch and output isolating switch are connected to the main breaker both sides of being incorporated into the power networks respectively in the isolating switch container, and are connected with the power cell container with the step-up transformer container by the step-down transformer container.Testing crew sends instructions under this device by remote platform, at first, closed input isolating switch, tested electric station grid connection point is by input isolating switch connection device.Then, closed output isolating switch is connected to electrical network with tested power station by the output isolating switch.Device according to command request output correspondent voltage fall, voltage disturbance and frequency disturbance curve, detect the low voltage ride-through capability and the voltage/frequency disturbance response characteristic in power station, and response curve carried out Treatment Analysis by control system.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation form, all drop on the protection domain of the utility model requirement.
Claims (5)
1. new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit, it is characterized in that, comprise isolating switch container, step-down transformer container, power cell container and step-up transformer container, primary circuit between each container is connected by high-tension cable, and signal wire directly links to each other by rectangular connector between case and the case.
2. new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit according to claim 1, it is characterized in that, the built-in input isolating switch of isolating switch container, output isolating switch, cable drum, measurement are used for connecting electrical network and input isolating switch, tested power station and output isolating switch respectively with high precision PT/CT and complex protection device, cable drum institute download cable.
3. new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit according to claim 1, it is characterized in that, built-in step-down transformer of step-down transformer container and cable drum, step-down transformer reduces the back with voltage to be used for the power cell container, and cable drum institute download cable is used for connecting step-down transformer and input isolating switch.
4. new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit according to claim 1, it is characterized in that, the built-in H bridging of power cell container frequently many level of power cell series electrical potential source type four-quadrant high voltage converter, split phase transformer and switch board.
5. new mobile type modular multi-function MW level low voltage ride-through capability pick-up unit according to claim 1, it is characterized in that, built-in step-down transformer of step-up transformer container and cable drum, step-up transformer are connected to the output isolating switch after voltage is raise; Cable drum institute download cable is used for connecting step-up transformer and output isolating switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200758020U CN202003012U (en) | 2011-03-22 | 2011-03-22 | Novel mobile modularized multi-functional MW-level low voltage ride-through capability detector |
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| CN2011200758020U CN202003012U (en) | 2011-03-22 | 2011-03-22 | Novel mobile modularized multi-functional MW-level low voltage ride-through capability detector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928696A (en) * | 2012-10-19 | 2013-02-13 | 青海电力科学试验研究院 | Test method applicable to low voltage ride through test of photovoltaic power station |
| CN103576085A (en) * | 2012-08-07 | 2014-02-12 | 上海电气风能有限公司 | Simply-equipped trigger device for testing wind generating set low voltage ride through function |
| CN103675523A (en) * | 2013-11-14 | 2014-03-26 | 国家电网公司 | Large-scale photovoltaic power station low voltage ride through detection system suitable for high altitude regions |
| CN104124916A (en) * | 2014-06-30 | 2014-10-29 | 国网青海省电力公司电力科学研究院 | Power grid fault simulation test system movement detection device for high-altitude photovoltaic power station |
| CN104184410A (en) * | 2014-06-30 | 2014-12-03 | 国网青海省电力公司电力科学研究院 | Mobile detection device for high-altitude photovoltaic power station power grid disturbance simulation test system |
| CN107086598A (en) * | 2017-03-06 | 2017-08-22 | 江苏华源新能源科技有限公司 | A kind of photovoltaic plant voltage dynamic disturbances experimental control method |
-
2011
- 2011-03-22 CN CN2011200758020U patent/CN202003012U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576085A (en) * | 2012-08-07 | 2014-02-12 | 上海电气风能有限公司 | Simply-equipped trigger device for testing wind generating set low voltage ride through function |
| CN102928696A (en) * | 2012-10-19 | 2013-02-13 | 青海电力科学试验研究院 | Test method applicable to low voltage ride through test of photovoltaic power station |
| CN103675523A (en) * | 2013-11-14 | 2014-03-26 | 国家电网公司 | Large-scale photovoltaic power station low voltage ride through detection system suitable for high altitude regions |
| CN104124916A (en) * | 2014-06-30 | 2014-10-29 | 国网青海省电力公司电力科学研究院 | Power grid fault simulation test system movement detection device for high-altitude photovoltaic power station |
| CN104184410A (en) * | 2014-06-30 | 2014-12-03 | 国网青海省电力公司电力科学研究院 | Mobile detection device for high-altitude photovoltaic power station power grid disturbance simulation test system |
| CN107086598A (en) * | 2017-03-06 | 2017-08-22 | 江苏华源新能源科技有限公司 | A kind of photovoltaic plant voltage dynamic disturbances experimental control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111005 |