CN104917367A - Flexible direct current transmission and alternating current resistance starting device - Google Patents
Flexible direct current transmission and alternating current resistance starting device Download PDFInfo
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- CN104917367A CN104917367A CN201510363075.0A CN201510363075A CN104917367A CN 104917367 A CN104917367 A CN 104917367A CN 201510363075 A CN201510363075 A CN 201510363075A CN 104917367 A CN104917367 A CN 104917367A
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Abstract
The invention relates to a flexible direct current transmission and alternating current resistance starting device which comprises a barrier box body, a bypass switch and a plurality of supporting insulators, wherein an alternating current power system is connected in parallel with one end of each of the barrier box body and the bypass switch by an alternating current circuit breaker; the other end of each of the barrier box body and the bypass switch is connected in parallel with a flexible direct current transmission system converter station; the supporting insulators used for supporting the barrier box body are fixedly arranged at the bottom of the barrier box body; an insulating porcelain core is fixedly arranged in the barrier box body; a resistance module is arranged on the insulating porcelain core in a winding manner; and an input end and an output end of the resistance module penetrate through wall sleeves arranged on the two sides of the barrier box body respectively, and then are connected with the alternating current circuit breaker and the flexible direct current transmission system converter station. The starting device can ensure safe starting and reliable operation of an MMC (Modular Multilevel Converter) in a flexible direct current transmission system, and can be widely applied in the field of flexible direct current transmission.
Description
Technical field
The present invention relates to flexible direct-current transmission field, particularly about a kind of flexible DC power transmission AC resistance starting drive.
Background technology
Flexible DC power transmission is a kind of VSC-HVDC technology outside conventional high-tension HVDC Transmission Technology, the feature that it is different from conventional high-tension HVDC Transmission Technology is that it adopts the semiconductor device (such as IGBT-Insulated Gate Bipolar Transistor igbt) of full-control type (can from conducting and shutoff) to carry out AC-DC conversion, and conventional high-tension HVDC Transmission Technology adopts the semiconductor device (as thyristor) of half control type (can not certainly can turn off from conducting) to carry out AC-DC conversion, need to rely on AC electric power systems to assist cutoff thyristor to its external voltage provided, guarantee that AC-DC conversion is normally carried out.Technology of HVDC based Voltage Source Converter and Traditional DC technology of transmission of electricity common ground are to be provided with both positive and negative polarity (pole I is positive pole, and pole II is negative pole), symmetrical operation mode during general employing positive and negative electrodes in same.Flexible DC power transmission engineering installation sending end and receiving end two current conversion stations, the change of current device in sending end current conversion station is connected by DC line with the change of current device in receiving end current conversion station, and two current conversion stations and DC line form flexible direct current power transmission system jointly.Flexible direct current power transmission system is generally connected with the on-site AC electric power systems of current conversion station at sending end and receiving end two current conversion stations, and namely two AC electric power systems complete electrical connection (as shown in Figure 1) by flexible direct current power transmission system.
As shown in Figure 2 and Figure 3, the convertor unit that Technology of HVDC based Voltage Source Converter uses, in its one end (sending end or receiving end) current conversion station, the three-phase brachium pontis of converter is by multiple submodule SM
1~ SM
nform, at least should comprise two IGBT elements T 1/T2 in each submodule (SM-Sub Module), with it the half control thyristor D1/D2 of reverse parallel connection, a DC storage capacitor C0.Modular multilevel converter valve (MMC-Modular MultilevelConverter) is constituted, namely MMC converter valve by numerous submodule.
A large amount of DC storage capacitor C0 (the DC storage capacitor C0 size of single submodule is determined according to engineering is actual) is comprised in submodule due to MMC converter valve each phase brachium pontis, MMC converter valve, before entering stable state normal operation mode, must carry out precharge to the DC storage capacitor C0 of these submodules.After all submodule precharge completes, just steady-working state can be entered.AC electric power systems a large amount of DC storage capacitor C0 in MMC converter valve in one end charges that time started, DC storage capacitor C0 voltage is 0, from electrical principle, namely the electric discharge of AC electric power systems shorted to earth is equal to, earth resistance is very little, thus charged electrical fails to be convened for lack of a quorum very large, can reach tens kiloamperes.Excessive charged electrical fails to be convened for lack of a quorum damage relevant device, the IGBT element especially in MMC converter valve.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of flexible DC power transmission AC resistance starting drive that can ensure that in flexible direct current power transmission system, the startup of MMC converter valve is safe, reliable.
For achieving the above object, the present invention takes following technical scheme: a kind of flexible DC power transmission AC resistance starting drive, is characterized in that: it comprises a barrier casing, bypass switch and some supporting insulators; AC electric power systems is connected in parallel one end of described barrier casing and described by-pass switch by AC circuit breaker, the other end parallel flexible DC transmission system current conversion station of described barrier casing and described by-pass switch, the bottom of described barrier casing is fixedly installed some described supporting insulators for supporting described barrier casing; Described barrier box house is fixedly installed an insulated ceramic core, described insulated ceramic core is wound around a resistive module is set, the input of described resistive module and output connect described AC circuit breaker and described flexible direct-current transmission system converter station after being fed through the wall bushing being arranged on described barrier casing both sides respectively.
Described resistive module comprises some resistance devices, and each resistance device is by wired in series or after being connected in parallel, and winding is fixed on described insulated ceramic core.
By each described resistance device by wired in series or the size of resistance value being connected in parallel the rear resistive module formed, determine according to the maximum rated current of IGBT element, the temperature capacity of each resistance device material and heat-sinking capability, charging interval restriction requirement in the electric pressure of two ends AC electric power systems, MMC converter valve.
Described barrier casing employing is corrosion-resistant, rust stable metal material is prepared from.
Supporting insulator described in each all adopts ceramic material insulator or composite material insulator.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention includes barrier casing, by-pass switch and supporting insulator, AC electric power systems is connected in parallel one end of barrier casing and by-pass switch by AC circuit breaker, the other end parallel flexible DC transmission system current conversion station of barrier casing and by-pass switch, the bottom of barrier casing is fixedly installed supporting insulator, barrier casing internal fixtion arranges resistive module, the connection AC circuit breaker respectively of resistive module and flexible direct-current transmission system converter station, can when flexible direct current power transmission system startup optimization, reduce the climbing speed starting charging current, the suitable increase charging interval, therefore, it is possible to the MMC converter valve device in protection flexible direct-current transmission system converter station starts safety, reliable, simultaneously, the current stress that in current conversion station, converter transformer and AC electric power systems equipment bear can also be reduced.2, resistive module of the present invention comprises some resistance devices, each resistance device is connected or is connected in parallel, this structure is convenient to search disconnection fault and replacing, also manufacture is beneficial to, in addition, the size of the resistance value of resistive module, the electric pressure according to two ends AC electric power systems, in MMC converter valve the maximum rated current of IGBT element, the temperature capacity of each resistance device material and heat-sinking capability, charging interval restriction to require etc. to determine, therefore can ensure that MMC converter valve charging current is suitable for, the charging interval meets the demands.3, barrier casing of the present invention is prepared from corrosion-resistant, rust stable metal material, in hexahedron box shape, therefore possesses certain ventilation and heat and rain-proof dust-proof ability.The present invention can be widely used in flexible direct-current transmission field.
Accompanying drawing explanation
Fig. 1 is existing flexible direct current power transmission system and two ends (sending end and receiving end) AC electric power systems connection diagram;
Fig. 2 is one end (single-phase) of existing flexible direct current power transmission system and AC electric power systems connection diagram;
Fig. 3 is existing flexible direct current power transmission system MMC converter valve submodule schematic diagram;
Fig. 4 is AC resistance starting drive scheme of installation of the present invention;
Fig. 5 is the structural representation of AC resistance starting drive of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 4, Figure 5, flexible DC power transmission AC resistance starting drive provided by the invention, it comprises a barrier casing 1, bypass switch 2 and some supporting insulators 3.
AC electric power systems is connected in parallel one end of barrier casing 1 and by-pass switch 2 by AC circuit breaker S1, the other end parallel flexible DC transmission system current conversion station of barrier casing 1 and by-pass switch 2, the bottom of barrier casing 1 is fixedly installed some supporting insulators 3 for supporting barrier casing 1.Barrier casing 1 inside is fixedly installed an insulated ceramic core (not shown), insulated ceramic core is wound around a resistive module is set, after the input of resistive module and output are fed through the wall bushing (not shown) being arranged on barrier casing 1 both sides respectively, connect AC circuit breaker and flexible direct-current transmission system converter station.
In a preferred embodiment, resistive module comprises some resistance device Ri (i=1,2,3 ... n), each resistance device Ri is by wired in series or after being connected in parallel, and winding is fixed on insulated ceramic core.As shown in Figure 5, the input of resistive module connects AC circuit breaker S1, and the output of resistive module connects flexible direct-current transmission system converter station.
In a preferred embodiment, by each resistance device Ri by wired in series or the size of resistance value being connected in parallel the rear resistive module formed, to require etc. to determine according to the maximum rated current of IGBT element, the temperature capacity of each resistance device Ri material and heat-sinking capability, charging interval restriction in the electric pressure of two ends AC electric power systems, MMC converter valve.Such as: in order to ensure the safety of MMC converter valve and other primary equipments, need limiting starting current when flexible direct current power transmission system starts, charging current is no more than the half of converter transformer AC rated current, and reserved certain nargin.If charging resistor is too small, charging current will be excessive, then can affect and adjoin electric equipment safety; If charging resistor is excessive, during charging, caloric value is excessive, then itself can damage AC resistance starting drive.
In a preferred embodiment, barrier casing 1 adopts corrosion-resistant, rust stable metal material to be prepared from, and in hexahedron box shape, possesses certain ventilation and heat and rain-proof dust-proof ability.
In a preferred embodiment, each supporting insulator 3 all can adopt ceramic material insulator or composite material insulator.
The concrete use procedure of flexible DC power transmission AC resistance starting drive provided by the invention is:
When flexible direct current power transmission system starts, closed AC circuit breaker S1, bypass switch opens 2, AC electric power systems is charged to the energy storage capacitor of MMC converter valve in flexible direct-current transmission system converter station by the some resistance device Ri in metallic barrier casing 1, after energy storage capacitor charging reaches pre-provisioning request, closes bypass switch 2.Flexible direct current power transmission system MMC converter valve is entering steady state operating conditions.
As shown in Figure 4, Figure 5, in Xiamen ± 320kV flexible DC power transmission science and technology demonstration project (1000 megawatt), sending end and receiving end two current conversion stations and the composition of the DC line between them flexible direct current power transmission system, two AC AC electric power systems are electrically connected by flexible direct current power transmission system.
Wherein, the highest voltage of DC power transmission line and change of current station equipment is ﹢ 320kV, and minimum voltage is ﹣ 320kV, and rated direct current is 1600A.The electric pressure that two ends exchange AC AC electric power systems is 220kV, is up to 230kV.This project MMC converter valve IGBT is the strictest to maximum restriction current requirements, and the rush of current stress that can bear is minimum, no more than its rated current 1600A.Generally, during charging, flow through the half of electric current no more than this project converter transformer AC rated current of AC resistance starting drive, and reserved certain nargin.Xiamen engineering ac-side current=separate unit converter transformer capacity/AC phase voltage, i.e. 177MVA/ (230kV/1.732)=1330A, and the resistance value of Xiamen engineering AC resistance starting drive is chosen for 2000 Ω, so during charging, its maximum phase current is (230kV/1.732)/2000 Ω ≈ 70A, much smaller than 1330A/2=665A, meet requirement of engineering.Also need in engineering practice to consider other influences factor, as stray capacitance etc., charging current during actual motion has certain deviation, about 10A level.In addition, resistive module is chosen to be 2000 Ω, and when the charging interval is 10 seconds, during charging, the caloric value of AC resistance starting drive is not high, belongs in its tolerance range.
The various embodiments described above are only for illustration of the present invention; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (6)
1. a flexible DC power transmission AC resistance starting drive, is characterized in that: it comprises a barrier casing, bypass switch and some supporting insulators;
AC electric power systems is connected in parallel one end of described barrier casing and described by-pass switch by AC circuit breaker, the other end parallel flexible DC transmission system current conversion station of described barrier casing and described by-pass switch, the bottom of described barrier casing is fixedly installed some described supporting insulators for supporting described barrier casing; Described barrier box house is fixedly installed an insulated ceramic core, described insulated ceramic core is wound around a resistive module is set, the input of described resistive module and output connect described AC circuit breaker and described flexible direct-current transmission system converter station after being fed through the wall bushing being arranged on described barrier casing both sides respectively.
2. a kind of flexible DC power transmission AC resistance starting drive as claimed in claim 1, it is characterized in that: described resistive module comprises some resistance devices, each resistance device is by wired in series or after being connected in parallel, and winding is fixed on described insulated ceramic core.
3. a kind of flexible DC power transmission AC resistance starting drive as claimed in claim 2, it is characterized in that: by each described resistance device by wired in series or the size of resistance value being connected in parallel the rear resistive module formed, determine according to the maximum rated current of IGBT element, the temperature capacity of each resistance device material and heat-sinking capability, charging interval restriction requirement in the electric pressure of two ends AC electric power systems, MMC converter valve.
4. a kind of flexible DC power transmission AC resistance starting drive as described in claim 1 or 2 or 3, is characterized in that: described barrier casing employing is corrosion-resistant, rust stable metal material is prepared from.
5. a kind of flexible DC power transmission AC resistance starting drive as described in claim 1 or 2 or 3, is characterized in that: supporting insulator described in each all adopts ceramic material insulator or composite material insulator.
6. a kind of flexible DC power transmission AC resistance starting drive as claimed in claim 4, is characterized in that: supporting insulator described in each all adopts ceramic material insulator or composite material insulator.
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| CN201510363075.0A CN104917367A (en) | 2015-06-26 | 2015-06-26 | Flexible direct current transmission and alternating current resistance starting device |
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| CN201510363075.0A CN104917367A (en) | 2015-06-26 | 2015-06-26 | Flexible direct current transmission and alternating current resistance starting device |
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Cited By (2)
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| CN109300635A (en) * | 2018-11-19 | 2019-02-01 | 国家电网有限公司 | Start-up resistor is used in a kind of transmission of electricity of high pressure flexible direct current |
| CN116345513A (en) * | 2023-03-16 | 2023-06-27 | 国网经济技术研究院有限公司 | SVG-based energy type direct current energy storage device and control method thereof |
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