CN207977770U - A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system - Google Patents

A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system Download PDF

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Publication number
CN207977770U
CN207977770U CN201820517752.9U CN201820517752U CN207977770U CN 207977770 U CN207977770 U CN 207977770U CN 201820517752 U CN201820517752 U CN 201820517752U CN 207977770 U CN207977770 U CN 207977770U
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Prior art keywords
preliminary filling
current
direct current
voltage
limiting resistance
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CN201820517752.9U
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张健
盛超
肖磊石
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system provided by the utility model, including DC voltage preliminary filling major loop;The DC voltage preliminary filling major loop is connected in the voltage source converter analogue system both ends based on emulation platform in parallel;The DC voltage preliminary filling major loop includes:It is micro- disconnected to exchange micro- disconnected, the exchange preliminary filling contactor of preliminary filling, preliminary filling rectifier diode, exchange preliminary filling current-limiting resistance, exchange preliminary filling current-limiting resistance, direct current preliminary filling current-limiting resistance, direct current preliminary filling current-limiting resistance, direct current preliminary filling contactor, direct current preliminary filling contactor and direct current preliminary filling.Difference of the utility model by the put position of current-limiting resistance, so that optimizing in the actual effect of spatial volume and Voltage Establishment and clearly being used, reflecting voltage source transverter preliminary filling resistance current limliting uses, avoid busbar Support Capacitor as voltage source, the voltage step and current limliting that moment closed circuit device is brought optimize product and use application scenarios.

Description

A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system
Technical field
The utility model is related to technical field of direct current power transmission more particularly to a kind of voltage source converters suitable for analogue system Device DC voltage preliminary filling circuit.
Background technology
In flexible direct current power transmission system, the voltage source converter DC side based on emulation platform must have sufficiently large branch Capacitance is supportted as voltage source, therefore capacitance has to current limliting pre-charge pressure to meet a stable voltage before establishing voltage Source.The front end is equipped with net with power grid junction and surveys reactor and transverter reactor.
The sinusoidal waveform stable generally for output is ensured, establishes DC voltage, and PWM tests are final and power grid grid-connected Connection, in order to avoid the physical damnification to subsequent voltage source transverter, optimization is played in irreversible power device damage.
Therefore it in order to allow analogue system to reflect the operating condition of transverter, needs to improve DC voltage preliminary filling process, carry High power electronic devices capacitance, reactance ensure that power device is protected in voltage or current step, switch performance Reliability, effectively reduce product cost, to instruct actual product performance, simplify power device once connection and second protection The wiring of device, ability of the raising DC transmission system device simulation application platform in practical application scene.
Utility model content
The utility model embodiment provides a kind of voltage source converter DC voltage preliminary filling suitable for analogue system time Road improves DC voltage preliminary filling process, improves the reliability of switch performance, effectively reduce product cost.
A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system provided by the utility model, including DC voltage preliminary filling major loop;
The DC voltage preliminary filling major loop is connected in the voltage source converter analogue system two based on emulation platform in parallel End;
The DC voltage preliminary filling major loop includes:Exchange the micro- disconnected KK12 of preliminary filling, exchange preliminary filling contactor KMY12, preliminary filling Rectifier diode DM, exchange preliminary filling current-limiting resistance CR1, exchange preliminary filling current-limiting resistance CR2, direct current preliminary filling current-limiting resistance CR3, direct current Preliminary filling current-limiting resistance CR4, direct current preliminary filling contactor KMY21, direct current preliminary filling contactor KMY22 and the micro- disconnected KK21 of direct current preliminary filling;
The micro- disconnected KK12 of the exchange preliminary filling, the exchange preliminary filling contactor KMY12, the preliminary filling rectifier diode DM, institute It states direct current preliminary filling contactor KMY21, the direct current preliminary filling contactor KMY22, the micro- disconnected KK21 of the direct current preliminary filling and is sequentially connected in series company It connects;
It connects in positive connecting wire between the preliminary filling rectifier diode DM and the direct current preliminary filling contactor KMY21 There are the exchange preliminary filling current-limiting resistance CR1 and the direct current preliminary filling current-limiting resistance CR3;
It connects in cathode connecting wire between the preliminary filling rectifier diode DM and the direct current preliminary filling contactor KMY21 There are the exchange preliminary filling current-limiting resistance CR2 and the direct current preliminary filling current-limiting resistance CR4;
Connecting wire between the exchange preliminary filling current-limiting resistance CR1 and direct current preliminary filling current-limiting resistance CR3 is connected to The positive connecting wire of the voltage source converter VSC and DC filter PF21 of the voltage source converter analogue system;
Connecting wire between the exchange preliminary filling current-limiting resistance CR2 and direct current preliminary filling current-limiting resistance CR4 is connected to The cathode connecting wire of the voltage source converter VSC and DC filter PF21 of the voltage source converter analogue system.
Preferably, which further includes:DC voltage preliminary filling accessory power supply circuit;
Include that alternating current source outputs division node DIO on the DC voltage preliminary filling accessory power supply circuit:01 and DC source Output division node DIO:02;
The alternating current source outputs division node DIO:01 one end connects one end of the exchange preliminary filling contactor KMY12, The alternating current source outputs division node DIO:The firewire of 01 other end connection control power supply, the exchange preliminary filling contactor The other end of KMY12 connects the zero curve of the control power supply;
The DC source outputs division node DIO:02 one end connects one end of the direct current preliminary filling contactor KMY21, The DC source outputs division node DIO:The firewire of 02 other end connection control power supply, the direct current preliminary filling contactor The other end of KMY21 connects the zero curve of the control power supply;
The direct current preliminary filling contactor KMY21 is in parallel with the direct current preliminary filling contactor KMY22.
Preferably, the alternating current source outputs division node DIO:01 specifically exchanges dividing for preliminary filling contactor KMY12 with described Zygonema circle connects;
The DC source outputs division node DIO:02 is specifically pre- with the direct current preliminary filling contactor KMY21 or described direct currents Fill the division coil connection of contactor KMY22.
Preferably, the voltage source converter analogue system based on emulation platform is specially AC circuit breaker QF11, hands over Flow filter PF11, power grid surveys reactance L2, transverter side reactance L1, the voltage source converter VSC, the DC filter PF21, dc circuit breaker QF21 are sequentially connected in series.
As can be seen from the above technical solutions, the utility model embodiment has the following advantages:
A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system provided by the utility model, including DC voltage preliminary filling major loop;The DC voltage preliminary filling major loop is connected in the voltage source converter based on emulation platform in parallel Analogue system both ends;The DC voltage preliminary filling major loop includes:Exchange the micro- disconnected KK12 of preliminary filling, exchange preliminary filling contactor KMY12, Preliminary filling rectifier diode DM, exchange preliminary filling current-limiting resistance CR1, exchange preliminary filling current-limiting resistance CR2, direct current preliminary filling current-limiting resistance CR3, Direct current preliminary filling current-limiting resistance CR4, direct current preliminary filling contactor KMY21, direct current preliminary filling contactor KMY22 and direct current preliminary filling are micro- disconnected KK21.The utility model exchanges preliminary filling current-limiting resistance CR1, exchange preliminary filling current-limiting resistance CR2, direct current preliminary filling current limliting electricity by optimization Position and the quantity for hindering CR3 and direct current preliminary filling current-limiting resistance CR4, according to the principle of preliminary filling current-limiting resistance and space physics position pair Hardware simulation system improves, by the setting of exchange preliminary filling current-limiting resistance in the positive and negative extreme and DC source preliminary filling of rectifier diode DC side Current-limiting resistance is mutually symmetrical, plays the role of current limliting and prevents short-circuit, positive and negative anodes wrong closed circuit abnormal scene, effectively reduces It is electrically connected wiring and device and occupies volume and rational deployment in cabinet, be radiating efficiency, power efficiency and space efficiency Promotion greatly improves.By the difference of the put position of current-limiting resistance so that in the actual effect of spatial volume and Voltage Establishment optimization and It is clearly used, the corresponding operating parameter in protected host is timely and effectively arranged to emulation training in simulation training system Logic judgment needed for system, reflecting voltage source transverter preliminary filling resistance current limliting use, and operational process is must first to establish directly Galvanic electricity pressure, the voltage step for avoiding busbar Support Capacitor as voltage source, moment closed circuit device and bringing and current limliting, optimization Product uses application scenarios.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system provided by the utility model One embodiment schematic diagram;
Fig. 2 is a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system provided by the utility model One embodiment in DC voltage preliminary filling accessory power supply circuit schematic diagram;
Fig. 3 is a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system provided by the utility model Schematic diagram before improvement.
Specific implementation mode
The utility model embodiment provides a kind of voltage source converter DC voltage preliminary filling suitable for analogue system time Road improves DC voltage preliminary filling process, improves the reliability of switch performance, effectively reduce product cost.
To enable the purpose of this utility model, feature, advantage more apparent and understandable, below in conjunction with this practicality Attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that under The described embodiments are only a part of the embodiments of the utility model in face, and not all embodiment.Based on the utility model In embodiment, all other implementation obtained by those of ordinary skill in the art without making creative efforts Example, shall fall within the protection scope of the present invention.
Referring to Fig. 1, a kind of voltage source converter DC voltage suitable for analogue system provided by the utility model is pre- Fill the one embodiment in circuit, including DC voltage preliminary filling major loop;
DC voltage preliminary filling major loop is connected in the voltage source converter analogue system based on emulation platform in parallel and (is used for base In the real-time simulation of Primary Component hardware physical layer) both ends;
DC voltage preliminary filling major loop includes:Exchange the micro- disconnected KK12 of preliminary filling, exchange preliminary filling contactor KMY12, preliminary filling rectification Diode DM, exchange preliminary filling current-limiting resistance CR1, exchange preliminary filling current-limiting resistance CR2, direct current preliminary filling current-limiting resistance CR3, direct current preliminary filling Current-limiting resistance CR4, direct current preliminary filling contactor KMY21, direct current preliminary filling contactor KMY22 and the micro- disconnected KK21 of direct current preliminary filling;
Exchange the micro- disconnected KK12 of preliminary filling, exchange preliminary filling contactor KMY12, preliminary filling rectifier diode DM, direct current preliminary filling contactor KMY21, direct current preliminary filling contactor KMY22, the micro- disconnected KK21 of direct current preliminary filling are sequentially connected in series;
It is pre- that exchange is in series in positive connecting wire between preliminary filling rectifier diode DM and direct current preliminary filling contactor KMY21 Fill current-limiting resistance CR1 and direct current preliminary filling current-limiting resistance CR3;
It is pre- that exchange is in series in cathode connecting wire between preliminary filling rectifier diode DM and direct current preliminary filling contactor KMY21 Fill current-limiting resistance CR2 and direct current preliminary filling current-limiting resistance CR4;
Connecting wire between exchange preliminary filling current-limiting resistance CR1 and direct current preliminary filling current-limiting resistance CR3 is connected to voltage source and changes Flow the positive connecting wire of the voltage source converter VSC and DC filter PF21 of device analogue system;
Connecting wire between exchange preliminary filling current-limiting resistance CR2 and direct current preliminary filling current-limiting resistance CR4 is connected to voltage source and changes Flow the cathode connecting wire of the voltage source converter VSC and DC filter PF21 of device analogue system.
These preliminary filling current-limiting resistances (CR1, CR2, CR3 and CR4) and its connection relation simplify number of devices, and from new It is labelled with device name, device terminal is made to greatly simplify, current limliting establishes voltage, emulation training in DC voltage preliminary filling circuit is run Above-mentioned corresponding operating parameter is arranged to simulation training system as actual condition by exercising system.
The utility model exchanges preliminary filling current-limiting resistance CR1, exchange preliminary filling current-limiting resistance CR2, direct current preliminary filling by optimization and limits The position and quantity of leakage resistance CR3 and direct current preliminary filling current-limiting resistance CR4, according to the principle of preliminary filling current-limiting resistance and space physics position It sets and hardware simulation system is improved, by the setting of exchange preliminary filling current-limiting resistance in the positive and negative extreme and DC source of rectifier diode DC side Preliminary filling current-limiting resistance is mutually symmetrical, plays the role of current limliting and prevents short-circuit, positive and negative anodes wrong closed circuit abnormal scene, effectively It reduces electrical connection wiring and device and occupies volume and rational deployment in cabinet, be radiating efficiency, power efficiency and space effect The promotion of rate greatly improves.By the difference of the put position of current-limiting resistance so that excellent in the actual effect of spatial volume and Voltage Establishment Change and clearly used, timely and effectively is arranged to emulate by the corresponding operating parameter in protected host in simulation training system Logic judgment needed for training system, reflecting voltage source transverter preliminary filling resistance current limliting use, and operational process is first to build Vertical DC voltage, the voltage step for avoiding busbar Support Capacitor as voltage source, moment closed circuit device and bringing and current limliting, It optimizes product and uses application scenarios.
Referring to Fig. 2, further, which further includes:DC voltage preliminary filling accessory power supply circuit;
Include that alternating current source outputs division node DIO on DC voltage preliminary filling accessory power supply circuit:01 and DC source output Division node DIO:02;
Alternating current source outputs division node DIO:One end of 01 one end connection exchange preliminary filling contactor KMY12, alternating current source are opened Go out division node DIO:The firewire of 01 other end connection control power supply, the other end connection control of exchange preliminary filling contactor KMY12 The zero curve of power supply processed;
DC source outputs division node DIO:One end of 02 one end connection direct current preliminary filling contactor KMY21, DC source are opened Go out division node DIO:The firewire of 02 other end connection control power supply, the other end connection control of direct current preliminary filling contactor KMY21 The zero curve of power supply processed;
Direct current preliminary filling contactor KMY21 is in parallel with direct current preliminary filling contactor KMY22.
Alternating current source outputs division node DIO:01, DC source outputs division node DIO:02, preliminary filling contactor is exchanged KMY12, direct current preliminary filling contactor KMY21 and direct current preliminary filling contactor KMY22 this five equipment are parallel between operation power, are made Preliminary filling circuit divide-shut brake circuit is achieved.
Further, alternating current source outputs division node DIO:01 specifically with the division coil that exchanges preliminary filling contactor KMY12 Connection;
DC source outputs division node DIO:02 specifically with direct current preliminary filling contactor KMY21 or direct current preliminary filling contactor The division coil of KMY22 connects, and enables preliminary filling contactor breaking-closing operating, realizes that pre-charge pressure is established in real time, meets voltage The lasting holding of the power output and voltage source of source transverter.
Further, the voltage source converter analogue system based on emulation platform is specially AC circuit breaker QF11, exchange Filter PF11, power grid survey reactance L2, transverter side reactance L1, voltage source converter VSC, DC filter PF21, direct current and break Road device QF21 is sequentially connected in series.
Referring to Fig. 1, compared to the circuit of attached drawing 3, preliminary filling circuit reduces a preliminary filling in the circuit of the utility model Resistance meets foundation and the response time of DC voltage simultaneously, and metering function is apparent, avoids due to positive wrong or short circuit, Electric current continues excessive defective loop device, while outputing node control and can also meet the needs of script.
The DC voltage preliminary filling of voltage source converter based on emulation platform, when alternating current source preliminary filling such as Fig. 1 preliminary fillings are micro- disconnected (KK12), exchange preliminary filling contactor (KMY12) is in "on" position, as Fig. 2 outputs division node (DIO:01), preliminary filling contactor (KMY12) circuit closed under operation power effect, precharge flow through rectifier diode (DM), and exchange current-limiting resistance (CR1) is handed over Ductility limit leakage resistance (CR2) finally charges to Support Capacitor.When DC source preliminary filling such as Fig. 1 preliminary fillings are micro- disconnected (KK21), direct current preliminary filling Contactor (KMY21) direct current preliminary filling contactor (KMY22) is in "on" position, as Fig. 2 outputs division node (DIO:02), preliminary filling Contactor (KMY21) preliminary filling contactor (KMY22) circuit closed, direct current current-limiting resistance (CR3), direct current under operation power effect Current-limiting resistance (CR4) finally charges to Support Capacitor.
When the voltage source converter DC voltage preliminary filling circuit operation based on emulation platform, abnormal conditions, such as Fig. 1 are encountered Preliminary filling is micro- disconnected (KK12), and exchange preliminary filling contactor (KMY12) is in "on" position, while preliminary filling is micro- disconnected (KK12), exchanges preliminary filling Contactor (KMY12) auxiliary contact are closed on simultaneously and give control system backfeed loop closure normally.As Fig. 2 outputs division node (DIO:01), preliminary filling contactor (KMY12) circuit closed, precharge under operation power effect flows through rectifier diode (DM), Current-limiting resistance (CR1) is exchanged, exchange current-limiting resistance (CR2) finally charges to Support Capacitor, DC voltage established, if direct current Electric voltage exception can feed back to straight-flow system, and that withdraws preliminary filling circuit outputs division node, and power device is avoided to damage.Keep emulation flat Platform applies upper simplified number of devices in real time, and secondary connection greatly reduces, perfect product function, voltage source converter and off-network is answered It is used with scene action message.
Attached drawing 3 will be explained below:
Referring to Fig. 3, attached drawing 3 is the circuit diagram before improving.Analogue system major loop topological circuit figure before optimization.It Preceding major loop topology maintains constant, and instruction improves preliminary filling loop feature resistance position and label and being exchanged comprising main loop Breaker (QF11), alternating current filter (PF11), power grid survey reactance (L2), transverter side reactance (L1), voltage source converter (VSC), DC filter (PF21), dc circuit breaker (QF21) major loop and DC voltage preliminary filling major loop include to exchange preliminary filling Micro- disconnected (KK12), exchange preliminary filling contactor (KMY12), preliminary filling rectifier diode (DM), exchange preliminary filling resistance (XCR1), exchange are pre- Charging resistance (XCR2);Exchange preliminary filling resistance (XCR3);Direct current preliminary filling resistance (XCR4), direct current preliminary filling resistance (XCR5), direct current is pre- Contactor (KMY21) is filled, direct current preliminary filling contactor (KMY22), direct current preliminary filling is micro- to break (KK21).
Wherein, DC voltage preliminary filling circuit is divided into alternating current source preliminary filling circuit and DC source preliminary filling circuit, ensures in direct current system In the case of system is there are single ended voltage source, voltage source converter can be made to establish DC voltage, PWM tests, power device works normally, To voltage source converter power output, it ensure that current limliting exports, save product cost, major loop topology is clear.
The above, above example are only to illustrate the technical solution of the utility model, rather than its limitations;Although ginseng The utility model is described in detail according to previous embodiment, it will be understood by those of ordinary skill in the art that:It is still Can be with technical scheme described in the above embodiments is modified, or which part technical characteristic is equally replaced It changes;And these modifications or replacements, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution Spirit and scope.

Claims (4)

1. a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system, which is characterized in that including direct current Press preliminary filling major loop;
The DC voltage preliminary filling major loop is connected in the voltage source converter analogue system both ends based on emulation platform in parallel;
The DC voltage preliminary filling major loop includes:Exchange the micro- disconnected KK12 of preliminary filling, exchange preliminary filling contactor KMY12, preliminary filling rectification Diode DM, exchange preliminary filling current-limiting resistance CR1, exchange preliminary filling current-limiting resistance CR2, direct current preliminary filling current-limiting resistance CR3, direct current preliminary filling Current-limiting resistance CR4, direct current preliminary filling contactor KMY21, direct current preliminary filling contactor KMY22 and the micro- disconnected KK21 of direct current preliminary filling;
It is the micro- disconnected KK12 of the exchange preliminary filling, the exchange preliminary filling contactor KMY12, the preliminary filling rectifier diode DM, described straight Stream preliminary filling contactor KMY21, the direct current preliminary filling contactor KMY22, the micro- disconnected KK21 of the direct current preliminary filling are sequentially connected in series;
It connects in positive connecting wire between the preliminary filling rectifier diode DM and the direct current preliminary filling contactor KMY21 State the exchange preliminary filling current-limiting resistance CR1 and direct current preliminary filling current-limiting resistance CR3;
It connects in cathode connecting wire between the preliminary filling rectifier diode DM and the direct current preliminary filling contactor KMY21 State the exchange preliminary filling current-limiting resistance CR2 and direct current preliminary filling current-limiting resistance CR4;
Connecting wire between the exchange preliminary filling current-limiting resistance CR1 and direct current preliminary filling current-limiting resistance CR3 is connected to described The positive connecting wire of the voltage source converter VSC and DC filter PF21 of voltage source converter analogue system;
Connecting wire between the exchange preliminary filling current-limiting resistance CR2 and direct current preliminary filling current-limiting resistance CR4 is connected to described The cathode connecting wire of the voltage source converter VSC and DC filter PF21 of voltage source converter analogue system.
2. a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system according to claim 1, It is characterized in that, further includes:DC voltage preliminary filling accessory power supply circuit;
Include that alternating current source outputs division node DIO on the DC voltage preliminary filling accessory power supply circuit:01 and DC source output Division node DIO:02;
The alternating current source outputs division node DIO:01 one end connects one end of the exchange preliminary filling contactor KMY12, described Alternating current source outputs division node DIO:The firewire of 01 other end connection control power supply, the exchange preliminary filling contactor KMY12's The other end connects the zero curve of the control power supply;
The DC source outputs division node DIO:02 one end connects one end of the direct current preliminary filling contactor KMY21, described DC source outputs division node DIO:The firewire of 02 other end connection control power supply, the direct current preliminary filling contactor KMY21's The other end connects the zero curve of the control power supply;
The direct current preliminary filling contactor KMY21 is in parallel with the direct current preliminary filling contactor KMY22.
3. a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system according to claim 2, It is characterized in that, the alternating current source outputs division node DIO:01 specifically with the division coil for exchanging preliminary filling contactor KMY12 Connection;
The DC source outputs division node DIO:02 specifically connects with the direct current preliminary filling contactor KMY21 or described direct current preliminary fillings The division coil of tentaculum KMY22 connects.
4. a kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system according to claim 1, It is characterized in that, the voltage source converter analogue system based on emulation platform is specially AC circuit breaker QF11, ac filter Device PF11, power grid survey reactance L2, transverter side reactance L1, the voltage source converter VSC, the DC filter PF21, straight Stream circuit breaker Q F21 is sequentially connected in series.
CN201820517752.9U 2018-04-12 2018-04-12 A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system Active CN207977770U (en)

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Application Number Priority Date Filing Date Title
CN201820517752.9U CN207977770U (en) 2018-04-12 2018-04-12 A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820517752.9U CN207977770U (en) 2018-04-12 2018-04-12 A kind of voltage source converter DC voltage preliminary filling circuit suitable for analogue system

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CN207977770U true CN207977770U (en) 2018-10-16

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