CN103941050A - Reactor switching system of voltage dropping device - Google Patents
Reactor switching system of voltage dropping device Download PDFInfo
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- CN103941050A CN103941050A CN201410092776.0A CN201410092776A CN103941050A CN 103941050 A CN103941050 A CN 103941050A CN 201410092776 A CN201410092776 A CN 201410092776A CN 103941050 A CN103941050 A CN 103941050A
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Abstract
The invention relates to a reactor switching system of a voltage dropping device. The reactor switching system comprises a first single-pole double-throw (SPDT) knife switch a second SPDT knife switch, a first reactor and a second reactor. The first SPDT knife switch is connected with a power grid connecting point. The second SPDT knife switch is connected with a short-circuit grounding point. Tapping points of the first reactor and the second reactor are connected to a voltage distribution testing line. The first SPDT knife switch and the second SPDT knife switch are selectively connected to the first reactor and the second reactor according to the voltage dropping depth which the voltage dropping device needs to generate, wherein the first reactor has five sections of reactance, and the second reactor has nine sections of reactance. According to the reactor switching system, the two SPDT knife switches are adopted to carry out switching connection between the two reactors with different sizes, so that the redundancy configuration of the reactors is lowered, and the cost of the whole voltage dropping device is reduced.
Description
Technical field
The present invention relates to new forms of energy access and control field, particularly, relate to a kind of reactor switched system of voltage falling device.
Background technology
Since Eleventh Five-Year Plan, China's generation of electricity by new energy industry development is advanced by leaps and bounds, and wind-powered electricity generation adding new capacity is doubled year after year, and solar cell yield is to surpass 100% average growth rate per annum fast development.Yet China's new forms of energy, in fast-developing, be also faced with new forms of energy and access on a large scale quality and the safety problem that electrical network brings.In order to guarantee the stable of the rear electrical network of the extensive access of the generations of electricity by new energy such as wind-powered electricity generation, photovoltaic generation, need to be in the situation that electrical network transient fault causes voltage rapid drawdown is to certain value at short notice, the generator unit such as wind-powered electricity generation, photovoltaic still can not depart from electrical network and operation continually and steadily, until power system restoration is normal, thereby " pass through " this low-voltage time, this ability is called as low voltage ride-through capability (Low Voltage Ride Through, LVRT).
Verify whether generator unit possesses low voltage ride-through capability, the voltage that need to come simulating grid fault to cause by specific voltage falling device falls.At present, the voltage falling device based on impedance short circuit voltage divider principle is widely used in low voltage crossing site test.From functional structure, impedance short circuit divided voltage falling device mainly comprises current limiting reactor, short-circuit reactance device and three functional parts of fling-cut switch cabinet.Fig. 1 shows the principle assumption diagram of existing voltage falling device.As shown in Figure 1, between voltage falling device series connection access electrical network and tested generator unit, by by-pass switch S1, drop into current limiting reactor X1 impact on electrical network with reduction voltage fall-down test with certain resistance value, by short circuiting switch cabinet S2, drop into there is specified impedance value short-circuit reactance device X2 to produce short circuit malfunction, thereby produce voltage in test point, fall.Test point voltage falls the ratio that the degree of depth equals current-limiting impedance and resulting impedance, i.e. Udip=X1/ (X1+X2) * Un, and wherein, Udip is that voltage falls the degree of depth, Un is system rated voltage.When carrying out the test that different voltage falls the degree of depth, the quantity dropping into by changing current limiting reactor and short-circuit reactance device, just can change impedance dividing point, thus the degree of depth that change voltage falls.
Low voltage crossing testing standard requirement voltage falling device can produce voltage within the scope of 0%Un～90%Un and fall, and adjusts step-length and is 10%Un.Fig. 2 shows the reactor configuration structure of current voltage falling device.For meeting testing standard requirement, voltage falling device adopts two groups of identical reactors that possess 9 taps respectively as current-limiting reactor and short-circuit reactance conventionally, as shown in Figure 2, current-limiting reactor head end is directly connected with electrical network access point A point, and short-circuit reactance head end is directly connected with earth point D point.Utilize copper bar or cable the specific tap of current-limiting reactor and short-circuit reactance (B point and C point) to be accessed respectively to the dividing potential drop test point of test macro, thereby by required current-limiting reactor section and short-circuit reactance section access test macro, realize the short circuit of different impedanoe ratios.
Above-mentioned conventional equipment principle is simple, current limiting reactor and short-circuit reactance device function are fixed, for producing the voltage of different depth, fall, conventionally need to configure respectively current limiting reactor and short-circuit reactance device that multiple function is single, when carrying out single test, there is the idle situation of many group reactors like this, caused the great redundancy waste of reactor, and increased the volume of equipment, more increased equipment cost.
Summary of the invention
The invention provides a kind of reactor switched system of voltage falling device, use two cover single-pole double-throw type switching over disconnecting links, between the reactor of two groups of different sizes, carry out function switching, complete the voltage drop test of different depth, reduced the redundant configuration of reactor, and equipment volume is reduced, and reduced the cost of whole voltage falling device.
For this purpose, the present invention proposes a kind of reactor switched system of voltage falling device, it is characterized in that, described system comprises the first single-pole double-throw (SPDT) disconnecting link, the second single-pole double-throw (SPDT) disconnecting link, the first reactor and the second reactor, described the first single-pole double-throw (SPDT) disconnecting link is connected with electrical network, described the second single-pole double-throw (SPDT) disconnecting link is connected with short circuit grounding point, and the voltage that need to test according to described voltage falling device with described the second single-pole double-throw switch (SPDT) of described the first single-pole double-throw switch (SPDT) falls the degree of depth and selects to be connected described the first reactor and the second reactor; Wherein said the first reactor has 5 sections of reactance, and described the second reactor has 9 sections of reactance.
Wherein, using the reactor being connected with described the first single-pole double-throw (SPDT) disconnecting link as current limiting reactor, using the reactor being connected with described the second single-pole double-throw (SPDT) disconnecting link as short-circuit reactance device.
Wherein, when described voltage falls the degree of depth 90%～50% time, described the first single-pole double-throw (SPDT) disconnecting link is connected to described the first reactor, and described the first reactor is as current limiting reactor, described the second single-pole double-throw (SPDT) disconnecting link is connected to described the second reactor, and described the second reactor is as short-circuit reactance device.
Wherein, when described voltage falls the degree of depth 0%～50% time, described the first single-pole double-throw switch (SPDT) is connected to described the second reactor, described the second reactor is as described current limiting reactor, described the second single-pole double-throw (SPDT) disconnecting link is connected to described the first reactor, and described the first reactor is as described short-circuit reactance device.
Wherein, when described voltage falls the degree of depth 50% time, the first single-pole double-throw (SPDT) disconnecting link can select to connect described the first reactor or above-mentioned the second reactor any one as current limiting reactor, described the second single-pole double-throw (SPDT) disconnecting link and described the first reactor not being connected with described the first single-pole double-throw (SPDT) disconnecting link or the connection of the second reactor are as short-circuit reactance device.
Beneficial effect
Use the reactor switched system of voltage falling device of the present invention, the value that in the time of can be according to voltage drop test, voltage falls the degree of depth is selected current limiting reactor and short-circuit reactance device, by single-pole double-throw (SPDT) disconnecting link, carry out the selection of reactor simultaneously, simple and convenient in use, improved the dirigibility of reactor system, simultaneously, use the reactor of two different reactance, can reduce the volume of whole voltage falling device, reduce simultaneously and use reactant devices, avoid the redundancy waste of equipment, also reduced the cost of device.
Accompanying drawing explanation
By reference to accompanying drawing, can more clearly understand the features and advantages of the present invention, accompanying drawing is schematically to should not be construed as the present invention is carried out to any restriction, in the accompanying drawings:
Fig. 1 shows the principle assumption diagram of existing voltage falling device.
Fig. 2 shows the reactor configuration structure of existing voltage falling device.
Fig. 3 is a kind of schematic diagram of connected mode that the reactor switched system of voltage falling device of the present invention is shown.
Fig. 4 is the schematic diagram of another kind of connected mode of the reactor switched system of voltage falling device of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Fig. 3 is a kind of schematic diagram of connected mode that the reactor switched system of voltage falling device of the present invention is shown.
With reference to Fig. 3, the reactor switched system system of the voltage falling device described in embodiments of the invention comprises the first single-pole double-throw (SPDT) disconnecting link K1, the second single-pole double-throw (SPDT) disconnecting link K2, the first reactor X3 and the second reactor X4.
The first single-pole double-throw (SPDT) disconnecting link K1 and the second single-pole double-throw (SPDT) disconnecting link K2 have identical structure, the connection that the first single-pole double-throw (SPDT) disconnecting link K1 and electrical network access point A are ordered, the connection that the second single-pole double-throw (SPDT) disconnecting link K2 and short circuit grounding point D are ordered.
In the present embodiment, the reactor being connected with the first single-pole double-throw (SPDT) disconnecting link K1 uses as current limiting reactor in voltage falling device, and the reactor being connected with the second single-pole double-throw (SPDT) disconnecting link K2 uses as short-circuit reactance device.
The first reactor X3 is the reactor with 5 sections of reactance, and the second reactor X4 is the reactor with 9 sections of reactance, and the tap of the first reactor X3 and the second reactor X4 is connected respectively to B point and the C point of dividing potential drop test point.The voltage that the first single-pole double-throw (SPDT) disconnecting link K1 need to test according to voltage falling device with the second single-pole double-throw (SPDT) disconnecting link K2 falls the degree of depth and selects to be connected described the first reactor X3 or the second reactor X4.
As shown in Figure 3, when the first single-pole double-throw (SPDT) disconnecting link K1 is connected to the first reactor X3, the first reactor X3 is as current limiting reactor, the second single-pole double-throw (SPDT) disconnecting link K2 is connected to the second reactor X4, the second reactor X4 is as short-circuit reactance device, by the tap of mobile the first reactor X3, can select the size of the value of current limiting reactor, now, the maximum access of electric current reactor is 5 sections of reactance, similarly, and by the tap of mobile the second reactor X4, can select the size of the value of short-circuit reactance device, the maximum access of short-circuit reactance device is 9 sections of reactance.
Fig. 4 is the schematic diagram of another kind of connected mode of the reactor switched system of voltage falling device of the present invention.
When current limiting reactor need to access larger reactance, can be by the first single-pole double-throw (SPDT) disconnecting link K1 be connected with the second single-pole double-throw (SPDT) disconnecting link K2 exchange, as shown in Figure 4, the first single-pole double-throw (SPDT) disconnecting link K1 is connected with the second reactor X4, the second single-pole double-throw (SPDT) disconnecting link K2 is connected with the first reactor X3, now the second reactor X4 is current limiting reactor, and the first reactor X3 is short-circuit reactance device, and the access of the maximum of current limiting reactor is 9 sections of reactance like this.
Table 1 is the connected mode of voltage falling device that the reactor switched system that adopts the present embodiment is shown current-limiting reactor and short-circuit reactance while carrying out voltage drop test within the scope of 0%Un～90%Un.
As shown in table 1, when voltage falls the degree of depth 90%～50% time, the first single-pole double-throw (SPDT) disconnecting link K1 is connected to the first reactor X3, the second single-pole double-throw (SPDT) disconnecting link K2 is connected to the second reactor X4, at this moment, the first reactor is current limiting reactor, and the second reactor is short-circuit reactance device.
When voltage falls the degree of depth 0%～50% time, described the first single-pole double-throw switch (SPDT) is connected to described the second reactor, and described the second single-pole double-throw (SPDT) disconnecting link is connected to described the first reactor, at this moment, the second reactor is current limiting reactor, and the first reactor is short-circuit reactance device.
Simultaneously, as can be seen from Table 1, when falling the degree of depth 50% time, because the quantity of current limiting reactor and short-circuit reactance device access is all 5 sections of reactance, so now two reactors can connect arbitrarily, the first single-pole double-throw (SPDT) disconnecting link K1 both can be connected to the first reactor, using the first reactor X3 as current limiting reactor, also can be connected to the second reactor X4, using the second reactor X4 as current limiting reactor, meanwhile, another reactor is connected with the second single-pole double-throw (SPDT) disconnecting link K2, as short-circuit reactance device.
Known by above-described embodiment, use the reactor switched system of voltage falling device of the present invention, the value that in the time of can be according to voltage drop test, voltage falls the degree of depth is selected current limiting reactor and short-circuit reactance device, by single-pole double-throw (SPDT) disconnecting link, carry out the selection of reactor simultaneously, simple and convenient in use, improved the dirigibility of reactor system, simultaneously, use the reactor of two different reactance, can reduce the volume of whole voltage falling device, reduce and use reactant devices simultaneously, avoided the redundancy waste of equipment, also reduced the cost of device.
Although described by reference to the accompanying drawings embodiments of the present invention, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such modification and modification all fall into by within claims limited range.
Claims (5)
1. the reactor switched system of a voltage falling device, it is characterized in that, described system comprises the first single-pole double-throw (SPDT) disconnecting link, the second single-pole double-throw (SPDT) disconnecting link, the first reactor and the second reactor, described the first single-pole double-throw (SPDT) disconnecting link is connected with electrical network tie point, described the second single-pole double-throw (SPDT) disconnecting link is connected with short circuit grounding point, the tap of described the first reactor and described the second reactor is connected respectively to dividing potential drop p-wire, and the voltage that described the first single-pole double-throw switch (SPDT) and described the second single-pole double-throw switch (SPDT) need to produce according to described voltage falling device falls the degree of depth and selects to be connected to described the first reactor and described the second reactor, wherein, described the first reactor has 5 sections of reactance, and described the second reactor has 9 sections of reactance.
2. the reactor switched system of voltage falling device according to claim 1, it is characterized in that, using the reactor being connected with described the first single-pole double-throw (SPDT) disconnecting link as current limiting reactor, using the reactor being connected with described the second single-pole double-throw (SPDT) disconnecting link as short-circuit reactance device.
3. the reactor switched system of voltage falling device according to claim 2, it is characterized in that, when described voltage falls the degree of depth 90%～50% time, described the first single-pole double-throw (SPDT) disconnecting link is connected to described the first reactor, described the first reactor is as current limiting reactor, described the second single-pole double-throw (SPDT) disconnecting link is connected to described the second reactor, and described the second reactor is as short-circuit reactance device.
4. the reactor switched system of voltage falling device according to claim 2, it is characterized in that, when described voltage falls the degree of depth 0%～50% time, described the first single-pole double-throw switch (SPDT) is connected to described the second reactor, described the second reactor is as current limiting reactor, described the second single-pole double-throw (SPDT) disconnecting link is connected to described the first reactor, and described the first reactor is as short-circuit reactance device.
5. the reactor switched system of voltage falling device according to claim 2, it is characterized in that, when described voltage falls the degree of depth 50% time, described the first single-pole double-throw (SPDT) disconnecting link can select to connect described the first reactor or described the second reactor any one as current limiting reactor, described the second single-pole double-throw (SPDT) disconnecting link and described the first reactor not being connected with described the first single-pole double-throw (SPDT) disconnecting link or above-mentioned the second reactor connection are as short-circuit reactance device.
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| CN201410092776.0A CN103941050B (en) | 2014-03-13 | 2014-03-13 | The reactor switched system of Voltage Drop device |
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| CN201410092776.0A CN103941050B (en) | 2014-03-13 | 2014-03-13 | The reactor switched system of Voltage Drop device |
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Cited By (1)
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| CN107061184A (en) * | 2017-04-06 | 2017-08-18 | 北京群菱能源科技有限公司 | False voltage generating means and the method for carrying out Voltage Drop test |
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| CN103529335A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Low voltage ride through detection device for grid connection photovoltaic inverter |
| KR20140014942A (en) * | 2012-07-27 | 2014-02-06 | 삼성중공업 주식회사 | Lvrt controlling device and method of wind power system |
| CN203759069U (en) * | 2014-03-13 | 2014-08-06 | 北京群菱能源科技有限公司 | Reactor switching system of voltage sag device |
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| CN202066924U (en) * | 2011-04-11 | 2011-12-07 | 上海电科电器科技有限公司 | Voltage sag simulation device |
| CN102721883A (en) * | 2012-06-15 | 2012-10-10 | 中国电力科学研究院 | Detecting device for low voltage ride-through of grid-connected photovoltaic inverter |
| KR20140014942A (en) * | 2012-07-27 | 2014-02-06 | 삼성중공업 주식회사 | Lvrt controlling device and method of wind power system |
| CN103529335A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Low voltage ride through detection device for grid connection photovoltaic inverter |
| CN203759069U (en) * | 2014-03-13 | 2014-08-06 | 北京群菱能源科技有限公司 | Reactor switching system of voltage sag device |
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| CN107061184A (en) * | 2017-04-06 | 2017-08-18 | 北京群菱能源科技有限公司 | False voltage generating means and the method for carrying out Voltage Drop test |
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