CN116232078A - Novel switch valve and control method - Google Patents

Novel switch valve and control method Download PDF

Info

Publication number
CN116232078A
CN116232078A CN202310019815.3A CN202310019815A CN116232078A CN 116232078 A CN116232078 A CN 116232078A CN 202310019815 A CN202310019815 A CN 202310019815A CN 116232078 A CN116232078 A CN 116232078A
Authority
CN
China
Prior art keywords
energy dissipation
voltage
energy
resistor
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310019815.3A
Other languages
Chinese (zh)
Inventor
张雪垠
赵彪
白睿航
屈鲁
余占清
曾嵘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsinghua University
Sichuan Energy Internet Research Institute EIRI Tsinghua University
Original Assignee
Tsinghua University
Sichuan Energy Internet Research Institute EIRI Tsinghua University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tsinghua University, Sichuan Energy Internet Research Institute EIRI Tsinghua University filed Critical Tsinghua University
Priority to CN202310019815.3A priority Critical patent/CN116232078A/en
Priority to PCT/CN2023/080609 priority patent/WO2024145991A1/en
Publication of CN116232078A publication Critical patent/CN116232078A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H02M1/096—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the power supply of the control circuit being connected in parallel to the main switching element
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a novel switch valve and a control method, wherein the novel switch valve comprises a terminal A, a terminal B and a plurality of series modules, and the series modules are connected in series and then arranged between the terminal A and the terminal; the series module comprises a full-control device T, a diode D, a voltage-sharing capacitor C and an energy dissipation element H connected in parallel with the voltage-sharing capacitor, wherein the anode of the diode D is connected with the anode of the full-control device T, the anode of the voltage-sharing capacitor C is connected with the cathode of the diode D, the cathode of the voltage-sharing capacitor C is connected with the cathode of the full-control device T, and the full-control device T is connected with the diode in an anti-parallel mode. The invention greatly reduces the consumption of power switch devices and capacitors of the traditional modularized converter valve topology, and has excellent economy.

Description

Novel switch valve and control method
Technical Field
The invention belongs to the technical field of direct-current transmission systems, and particularly relates to a novel switch valve and a control method.
Background
Power electronics is a typical feature of new power systems. The power electronic converter plays roles of converting electric energy, voltage conversion, power conversion and the like in a power system, and has the characteristics of high voltage and large capacity.
Limited by the state of the art of power electronic power semiconductor devices, existing high voltage high capacity power electronic converters are typically based on modular converter valve topologies; the modular converter valve topology realizes the improvement of the withstand voltage level through the cascade connection of sub-modules such as a half bridge, a full bridge and the like. The power electronic power semiconductor switching device is clamped by a large-capacity module capacitor, voltage levels at two ends of the device are stable, and safety is high. However, the number of power electronic power semiconductor switching devices in the topology is large, the module capacitance is large, and the cost is high.
Therefore, a novel switch valve and a control method are needed to solve the above technical problems.
Disclosure of Invention
In view of the above technical problems, the present invention provides a novel switch valve, wherein the novel switch valve includes a terminal a, a terminal B, and a plurality of series modules, and the plurality of series modules are connected in series and then arranged between the terminal a and the terminal;
wherein the series module comprises a full control device T, a diode D, a voltage-sharing capacitor C and an energy consumption element H connected with the voltage-sharing capacitor in parallel, wherein,
the anode of the diode D is connected with the anode of the full-control device T, the anode of the voltage-sharing capacitor C is connected with the cathode of the diode D, the cathode of the voltage-sharing capacitor C is connected with the cathode of the full-control device T, and the full-control device T is connected with the diode in an anti-parallel mode.
Further, the energy dissipation element H is any one or a combination of an energy dissipation power V, a first energy dissipation resistor R1, and a switchable energy dissipation resistor, where the switchable energy dissipation resistor includes a second energy dissipation resistor R2 and a switch S connected in series with the second energy dissipation resistor R2.
Further, when the energy dissipation element H is the energy taking power source V, the positive electrode of the energy taking power source V is connected to the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy taking power source V is connected to the negative electrode of the voltage-sharing capacitor C.
Further, when the energy dissipation element H is a first energy dissipation resistor R1, the first energy dissipation device consumes electricity
One end of the resistor R1 is connected to the positive electrode of the voltage-sharing capacitor C, and the other end of the first energy-consuming resistor R1 is connected to the negative electrode of the voltage-sharing capacitor C through a connection 5.
Further, when the energy dissipation element H is a switchable energy dissipation resistor, one end of the switch S is connected to one end of the second energy dissipation resistor R2, the other end of the switch S is connected to the positive electrode of the voltage-sharing capacitor C, and the other end of the second energy dissipation resistor R2 is connected to the negative electrode of the voltage-sharing capacitor C.
Further, the first combination form is:
0 the energy dissipation element H comprises a switchable energy dissipation resistor and an energy taking power supply V, wherein the switch
One end of the switch S is connected with one end of the second energy consumption resistor R2, and the other end of the switch S is connected with the positive electrode of the energy taking power supply V; the other end of the second energy consumption resistor R2 is connected to the negative electrode of the energy taking power supply V; the positive electrode of the energy-taking power supply V is connected with the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy-taking power supply V is connected with the negative electrode of the voltage-sharing capacitor C.
5, the second combination form is:
the energy dissipation element H comprises a first energy dissipation resistor R1 and an energy dissipation power supply V, wherein one end of the first energy dissipation resistor R1 is connected to the positive electrode of the energy dissipation power supply V, the other end of the first energy dissipation resistor R1 is connected to the negative electrode of the energy dissipation power supply V, the positive electrode of the energy dissipation power supply V is connected to the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy dissipation power supply V is connected to the negative electrode of the voltage-sharing capacitor C.
0, the second combination form is:
the energy dissipation element H comprises a first energy dissipation resistor R1, an energy dissipation power supply V and a switchable energy dissipation resistor, wherein one end of the first energy dissipation resistor R1 is connected to the positive electrode of the energy dissipation power supply V, the other end of the first energy dissipation resistor R1 is connected to the negative electrode of the energy dissipation power supply V, and the positive electrode of the energy dissipation power supply V
The anode of the energy taking power supply V is connected with the 5 cathode of the voltage-sharing capacitor C; one end of the switch S is connected with one end of the second energy dissipation resistor R2, and the other end of the switch S
One end is connected with one end of the first energy dissipation resistor R1, and the other end of the second energy dissipation resistor R2 is connected with the other end of the first energy dissipation resistor R1.
Further, the cathode and anode of the full control device T are connected with a bypass switch K in parallel.
Further, the switch S is any one of a relay, a contactor, a circuit breaker, and a semiconductor switch.
In another aspect, the present invention also provides a control method of a novel switching valve employing the novel switching valve according to any one of claims 1 to 8, the control method comprising:
after the novel switch valve reaches the normal working condition, N2 modules are allocated between two terminals of the novel switch valve A, B, wherein N2 is more than or equal to 1;
sequencing the voltage of a voltage equalizing capacitor C of the novel switching valve N1+ N2 series modules;
after sequencing, the front N2 series modules with the voltage from high to low keep the full control device T to be conducted, and the full control devices T of the other N1 series modules are controlled to be conducted or closed so as to achieve voltage sharing control of voltage sharing capacitors in all the series modules.
Further, the normal operating conditions are: n1 is equal to or greater than Umax;
wherein Umax is the voltage peak between the two terminals of the novel switch valve A, B; usm is the voltage rating of the equalizing capacitor C of a single series module; n1 is the number of series modules in the novel switch valve before N2 series modules are not configured.
The invention provides a novel switch valve and a control method, which greatly reduce the consumption of power switch devices and capacitors of the traditional modularized converter valve topology, have excellent economy, can ensure the reliable voltage equalization of power electronic power semiconductor devices, can realize self-energy taking, can ensure the voltage equalization consistency of voltage equalization capacitors in each series module, does not need to detect the direction of bridge arm current (current between terminals A and B), and is simple and effective in control.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a topology of a novel on-off valve according to an embodiment of the invention.
Fig. 2 shows a topology of a series module according to an embodiment of the invention.
Fig. 3 shows a topology of the energy consuming element H when the energy consuming element H is an energy taking power V according to an embodiment of the present invention.
Fig. 4 shows a topology of the dissipative element H when the dissipative element H is the first dissipative resistor R1 according to an embodiment of the invention.
Fig. 5 shows a topology of the energy dissipating element H when the energy dissipating element H is a switchable energy dissipating resistor according to an embodiment of the present invention.
Fig. 6 shows a topology diagram of a first combination according to an embodiment of the invention.
Fig. 7 shows a topology diagram of a second combination according to an embodiment of the invention.
Fig. 8 shows a topology diagram of a third combination according to an embodiment of the invention.
Fig. 9 shows a topology of a single-phase AC/DC circuit according to an embodiment of the present invention.
Fig. 10 shows a topology of a three-phase AC/DC circuit according to an embodiment of the invention.
Fig. 11 shows a topology diagram of a BOOST converter according to an embodiment of the invention.
Fig. 12 shows a topology diagram of a BUCK converter according to an embodiment of the invention.
Fig. 13 shows a flow chart of a control method of a novel switching valve according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Existing high voltage high capacity power electronic converters are also typically based on another form of converter valve topology, namely a device-series converter valve topology. The device series converter valve topology directly connects the power electronic power semiconductor devices in series to withstand high voltage, so that the consumption of the power electronic power semiconductor switch and the capacitor is greatly reduced, but the dynamic voltage equalizing is difficult due to the difference of the dynamic characteristics of the power electronic power semiconductor devices, and the self-energy taking of the driving power supply of the power electronic power semiconductor devices is difficult to realize, so that the power electronic power semiconductor device is difficult to apply in engineering practice.
Based on the problems existing in the prior art, as shown in fig. 1, the invention provides a novel switch valve, wherein the novel switch valve comprises a terminal A, a terminal B and one or more series modules, one series module is arranged between the terminal A and the terminal, and a plurality of series modules are arranged between the terminal A and the terminal after being connected in series.
Wherein, as shown in fig. 2, the series module comprises a full control device T, a diode D, a voltage-sharing capacitor C and an energy-consuming element H connected in parallel with the voltage-sharing capacitor, wherein,
the anode of the diode D is connected with the anode of the full-control device T, the anode of the voltage-sharing capacitor C is connected with the cathode of the diode D, the cathode of the voltage-sharing capacitor C is connected with the cathode of the full-control device T, and the full-control device T is connected with the diode in an anti-parallel mode. The cathode and anode of the full control device T are connected with a bypass switch K in parallel.
In one embodiment of the invention, a bridge arm of the novel switch valve is formed between the terminal A and the terminal B, wherein the bridge arm comprises an upper bridge arm and a lower bridge arm which are connected in series, the upper bridge arm and the lower bridge arm comprise a plurality of series modules which are connected in series, and the upper bridge arm and the lower bridge arm are connected through a connecting midpoint.
In one embodiment of the invention, in the upper bridge arm of the novel switch valve, the anode of the full-control device T in the first series module is used as the other end of the upper bridge arm, the cathode of the full-control device T in the last series module is used as one end of the upper bridge arm, and the anodes of the full-control devices T in the other series modules are connected with the cathodes of the previous full-control devices T.
In the lower bridge arm of each bridge arm of the novel switch valve, the anode of the full-control device T in the first series module is used as one end of the lower bridge arm, the cathode of the full-control device T in the last series module is used as the other end of the lower bridge arm, and among the full-control devices T of the rest series modules, the anode of the next full-control device T is connected with the cathode of the previous full-control device T.
In this embodiment, in each bridge arm, the other end of the upper bridge arm is one end (i.e., the a terminal) of the whole bridge arm, the other end of the lower bridge arm is the other end (i.e., the B terminal) of the whole bridge arm, and one end of the upper bridge arm is connected with one end of the lower bridge arm through a connection midpoint.
In an embodiment of the present invention, the energy dissipation element H is any one or a combination of an energy dissipation power source V, a first energy dissipation resistor R1, and a switchable energy dissipation resistor, where the energy dissipation power source V is configured to obtain energy from the voltage-sharing capacitor C and supply power to the control circuit of the serial module.
As shown in fig. 3, when the energy dissipation element H is the energy taking power source V, the positive electrode+ of the energy taking power source V is connected to the positive electrode of the voltage equalizing capacitor C, and the negative electrode thereof is connected to the negative electrode of the voltage equalizing capacitor C.
As shown in fig. 4, when the energy dissipation element H is the first energy dissipation resistor R1, one end of the first energy dissipation resistor R1 is connected to the positive electrode of the voltage-sharing capacitor C, and the other end is connected to the negative electrode of the voltage-sharing capacitor C.
As shown in fig. 5, when the energy dissipation element H is a switchable energy dissipation resistor, the switchable energy dissipation resistor includes a second energy dissipation resistor R2 and a switch S (for example, the switch S may be a switch with a current that can be broken by a relay, a contactor, a circuit breaker, a semiconductor switch, etc.), one end of the switch S is connected to one end of the second energy dissipation resistor R2, the other end of the switch S is connected to the positive electrode of the voltage-sharing capacitor C, and the other end of the second energy dissipation resistor R2 is connected to the negative electrode of the voltage-sharing capacitor C, so that the switching control of the second energy dissipation resistor R2 can be implemented through the set switch S.
When the energy dissipation element H is a combination of the energy dissipation power source V, the first energy dissipation resistor R1 and the switchable energy dissipation resistor, the structure of the combination includes, but is not limited to, the following combination forms:
first combination form: as shown in fig. 6, the energy-saving power supply comprises a switchable energy-consuming resistor and an energy-taking power supply V, wherein one end of a switch S in the switchable energy-consuming resistor is connected to one end of a second energy-consuming resistor R2, and the other end is connected to the positive electrode +; the other end of the second energy consumption resistor R2 is connected with the negative electrode of the energy taking power supply V; the positive electrode of the energy taking power supply V is + connected to the positive electrode of the voltage-sharing capacitor C, and the negative electrode is-connected to the negative electrode of the voltage-sharing capacitor C, and in this combination, the following changes may be made to the switch S:
one end of a switch S in the switchable energy dissipation resistor is connected to the other end of the second energy dissipation resistor R2, and the other end of the switch S in the switchable energy dissipation resistor is connected to the negative pole of the energy taking power supply V; one end of the second energy dissipation resistor R2 is connected to the positive electrode+ of the energy taking power supply V.
Second combination form: as shown in fig. 7, the energy-saving capacitor comprises a first energy-consuming resistor R1 and an energy-saving power supply V, wherein one end of the first energy-consuming resistor R1 is connected with the positive electrode+ of the energy-saving power supply V, the other end of the first energy-consuming resistor R1 is connected with the negative electrode of the energy-saving power supply V, the positive electrode+ of the energy-saving power supply V is connected with the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the first energy-consuming resistor R1 is connected with the negative electrode of the voltage-sharing capacitor C.
Third combination form: as shown in fig. 8, the energy-saving capacitor comprises a first energy-saving resistor R1, an energy-saving power supply V and a switchable energy-saving resistor, wherein one end of the first energy-saving resistor R1 is connected with the positive electrode+ of the energy-saving power supply V, the other end of the first energy-saving resistor is connected with the negative electrode of the energy-saving power supply V, the positive electrode+ of the energy-saving power supply V is connected with the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy-saving power supply V is connected with the negative electrode of the voltage-sharing capacitor C; one end of the switch S is connected to one end of the second energy dissipation resistor R2, the other end is connected to one end of the first energy dissipation resistor R1, and the other end of the second energy dissipation resistor R2 is connected to the other end of the first energy dissipation resistor R1.
One end of the switch S is connected to the other end of the second energy dissipation resistor R2, the other end of the switch S is connected to the other end of the first energy dissipation resistor R1, and one end of the second energy dissipation resistor R2 is connected to one end of the first energy dissipation resistor R1.
In one embodiment of the present invention, the fully controlled device T may be an insulated gate bipolar transistor (InsulatedGateBipolarTransistor, IGBT), an integrated gate commutated thyristor (Integrated Gate-CommutatedThyristor, IGCT), a Field effect transistor (Field-EffectTransistor, FET), or the like.
In one embodiment of the invention, based on the novel switching valve, various types of converter topologies may be constructed. By way of example, a single phase AC/DC circuit (as shown in fig. 9), a three phase AC/DC circuit (as shown in fig. 10), a BOOST converter (as shown in fig. 11), a BUCK converter (as shown in fig. 12), etc. may be constructed that is suitable for use in medium to high voltage applications.
The single-phase AC/DC circuit comprises two bridge arms shown in the figure 1, wherein connecting reactance is connected to the connecting midpoints of the two bridge arms, an alternating current port is formed between the connecting reactance, and a direct current port is formed between one end and the other end of one bridge arm.
The three-phase AC/DC circuit comprises three bridge arms shown in the figure 1, wherein connecting reactance is connected to the connecting midpoints of the three bridge arms, an alternating current port is formed between the connecting reactance, and a direct current port is formed between one end and the other end of one bridge arm.
The BOOST converter comprises one bridge arm shown in fig. 1, and one end of the one bridge arm is connected with the smoothing reactance L and the plurality of diodes. The diodes D1 are connected in series, a high-voltage side direct current port is formed between the cathode of the first diode D1 and the other end of the bridge arm in the plurality of diodes D1, the anode of the last diode D1 is connected to one end of the bridge arm, and the cathode of the last diode D1 is connected to the anode of the previous diode in the rest diodes D1. In fig. 11, one end of smoothing reactor L is connected to one end of the arm, and a low-voltage side dc port is formed between the other end of smoothing reactor L and the other end of the arm.
Wherein the BUCK converter comprises a bridge arm shown in fig. 1, a connection reactance, and a plurality of diodes D1, wherein the cathode of the first diode D1 is connected with the other end of the bridge arm, a high-voltage side direct current port is formed between the anode of the last diode D1 and one end of the bridge arm, and the rest is
In the remaining diode D1, the cathode of the latter diode D1 is connected to the anode of the former diode. One end of the connection reactance of the connection 5 is connected to the cathode of the first diode D1, and a low-voltage side direct current port is formed between the other end of the connection reactance and the anode of the last diode D1.
In the invention, the converter topology based on the novel switch valve does not need to adopt sub-modules such as a half bridge, a full bridge and the like required by a modularized topology, and the number of power switch devices is greatly reduced. Wherein, diode D
The current is very small, so the cost is low and the volume is small. Based on the converter topology of the novel switch valve, the voltage-sharing 0 capacitor C does not absorb fundamental frequency and double frequency fluctuation power existing in the alternating current application of the traditional modularized topology,
the capacitance is small. Based on the converter topology of the novel switch valve, the voltage-sharing capacitor C is blocked by the diode D through the discharging passage of the full-control device T, so that the voltage-sharing capacitor C cannot be short-circuited and discharged when the full-control device T is conducted, power loss is generated, the safety of the device and the capacitor is threatened, and based on the voltage-sharing capacitor C, the voltage-sharing capacitor C takes a value
The voltage equalizing effect is far better than that of the traditional switch topology, and the safety is better. 5-converter topology based on novel switching valve, relatively large equalizing capacitor C thereof can maintain stable capacitor for a long time
The voltage can be supplied by a self-energy-taking power supply (energy-taking power supply), so that the self-energy-taking problem of the switch topology is solved.
On the other hand, as shown in fig. 13, the present invention also provides a control method of a novel switching valve, the novel switching valve adopting the above novel switching valve, the control method comprising:
step S1: the novel switch valve reaches a normal working condition, wherein the normal working condition is as follows: and 0, configuring the rated voltage of the series module N1 and the voltage-sharing capacitor C, and meeting the voltage peak value Umax between N1 and Usm is larger than or equal to the terminal A, B, namely N1 and Usm is larger than or equal to Umax.
Step S2: after the novel on-off valve reaches the normal working condition, in order to meet the requirement of pressure equalizing control and improve the reliability of the serial valve, N2 modules are reconfigured between two ends of the novel on-off valve A, B,
and N2 is more than or equal to 1, and after N2 series modules are additionally added, the number of bridge arm series modules is updated to N1+N2. Step 5S 3: the voltage of the equalizing capacitor C of the novel switching valve N1+ N2 series modules is sequenced.
Step S4: after sequencing, the front N2 series modules with the voltages from high to low keep the full control device T to be conducted, and the full control devices T of the other N1 series modules are controlled to be conducted or closed according to the needs so as to achieve voltage sharing control of voltage sharing capacitors in all the series modules;
step S5: and repeating the steps S3 to S5 to maintain the long-term voltage equalization of the voltage equalizing capacitors in all the series modules.
In this embodiment, it should be understood that Umax is a voltage peak between two terminals of the novel on-off valve A, B; usm is the voltage rating of the equalizing capacitor C of a single series module; n1 is the number of series modules in the novel switch valve before N2 series modules are not configured.
In this embodiment, the topology of the novel switch valve must normally work to satisfy N1×usm not less than Umax, because when the above conditions are not met, after the novel switch valve is turned off (the fully controlled device T is turned off), if the voltage peak value Umax at the two ends of the terminal A, B is not less than N1×usm, current still flows at the two ends of the terminal A, B, so that the effect of turning off the bridge arm cannot be achieved, and thus the normal work cannot be achieved.
According to the voltage equalizing control method provided by the invention, the full-control device T of the series module with higher voltage is always in a trigger state, the voltage equalizing capacitor C of the full-control device T cannot be charged, and the capacitor voltage can be reduced. In the series module with lower voltage, the full control device T is turned on and turned off as required, and in the time period of turning off the full control device T, the bridge arm current of the novel switch valve charges the equalizing capacitor C through the diode D, so that the voltage of the equalizing capacitor C is increased. Therefore, the voltage equalization of the equalizing capacitor C can be realized under the condition of not detecting the current direction of the bridge arm by the method, and the control is simple and effective.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.

Claims (12)

1. The novel switch valve comprises a terminal A, a terminal B and a plurality of series modules, wherein the series modules are connected in series and then arranged between the terminal A and the terminal;
wherein the series module comprises a full control device T, a diode D, a voltage-sharing capacitor C and an energy-consuming element H connected with the voltage-sharing capacitor of 5 in parallel, wherein,
the anode of the diode D is connected with the anode of the full-control device T, the anode of the voltage-sharing capacitor C is connected with the cathode of the diode D, the cathode of the voltage-sharing capacitor C is connected with the cathode of the full-control device T, and the full-control device T is connected with the diode in an anti-parallel mode.
2. The novel switch valve according to claim 1, wherein the energy dissipation element H is any one or combination of a 0 energy dissipation power supply V, a first energy dissipation resistor R1 and a switchable energy dissipation resistor,
the switchable energy dissipation resistor comprises a second energy dissipation resistor R2 and a switch S connected in series with the second energy dissipation resistor R2.
3. The novel switch valve according to claim 2, wherein when the energy dissipation element H is an energy taking power supply V, the positive electrode of the energy taking power supply V is connected to the positive electrode of the voltage equalizing capacitor C, and the negative electrode of the 5 energy taking power supply V is connected to the negative electrode of the voltage equalizing capacitor C.
4. The novel switching valve according to claim 2, wherein when the energy dissipation element H is a first energy dissipation resistor R1, one end of the first energy dissipation resistor R1 is connected to the positive electrode of the voltage-sharing capacitor C, and the other end of the first energy dissipation resistor R1 is connected to the negative electrode of the voltage-sharing capacitor C.
5. The novel switching valve according to claim 2, wherein when the energy dissipation element H0 is a switchable energy dissipation resistor, one end of the switch S is connected to one end of the second energy dissipation resistor R2, the other end of the switch S is connected to the positive electrode of the voltage-sharing capacitor C, and the other end of the second energy dissipation resistor R2 is connected to the negative electrode of the voltage-sharing capacitor C.
6. The novel on-off valve of claim 2, wherein the combination has a first combination form, wherein the first combination form is:
the energy consumption element H comprises a switchable energy consumption resistor and an energy taking power supply V, wherein one end of the switch S is connected with one end of the second energy consumption resistor R2, and the other end of the switch S is connected with the positive electrode of the energy taking power supply V; the other end of the second energy consumption resistor R2 is connected to the negative electrode of the energy taking power supply V;
the positive electrode of the energy-taking power supply V is connected with the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy-taking power supply V is connected with the negative electrode of the voltage-sharing capacitor C.
7. The novel on-off valve of claim 2, wherein the combination has a second combination form, wherein the second combination form is:
the energy dissipation element H comprises a first energy dissipation resistor R1 and an energy dissipation power supply V, wherein one end of the first energy dissipation resistor R1 is connected to the positive electrode of the energy dissipation power supply V, the other end of the first energy dissipation resistor R1 is connected to the negative electrode of the energy dissipation power supply V, the positive electrode of the energy dissipation power supply V is connected to the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy dissipation power supply V is connected to the negative electrode of the voltage-sharing capacitor C.
8. The novel on-off valve of claim 2, wherein the combination has a second combination form, wherein the second combination form is:
the energy dissipation element H comprises a first energy dissipation resistor R1, an energy dissipation power supply V and a switchable energy dissipation resistor, wherein one end of the first energy dissipation resistor R1 is connected to the positive electrode of the energy dissipation power supply V, the other end of the first energy dissipation resistor R1 is connected to the negative electrode of the energy dissipation power supply V, the positive electrode of the energy dissipation power supply V is connected to the positive electrode of the voltage-sharing capacitor C, and the negative electrode of the energy dissipation power supply V is connected to the negative electrode of the voltage-sharing capacitor C; one end of the switch S is connected to one end of the second energy dissipation resistor R2, the other end of the switch S is connected to one end of the first energy dissipation resistor R1, and the other end of the second energy dissipation resistor R2 is connected to the other end of the first energy dissipation resistor R1.
9. A novel switching valve according to any one of claims 1-8, wherein the cathode and anode of the fully controlled device T are connected in parallel with a bypass switch K.
10. A novel switching valve according to any one of claims 2-8, wherein said switch S is any one of a relay, a contactor, a circuit breaker and a semiconductor switch.
11. A control method of a novel switching valve employing the novel switching valve according to any one of claims 1 to 8, the control method comprising:
after the novel switch valve reaches the normal working condition, N2 modules are allocated between two terminals of the novel switch valve A, B, wherein N2 is more than or equal to 1;
sequencing the voltage of a voltage equalizing capacitor C of the novel switching valve N1+ N2 series modules;
after sequencing, the front N2 series modules with the voltage from high to low keep the full control device T to be conducted, and the full control devices T of the other N1 series modules are controlled to be conducted or closed so as to achieve voltage sharing control of voltage sharing capacitors in all the series modules.
12. A control method of a new type of switching valve according to claim 2, wherein the normal operating conditions are: n1 is equal to or greater than Umax;
wherein Umax is the voltage peak between the two terminals of the novel switch valve A, B; usm is the voltage rating of the equalizing capacitor C of a single series module; n1 is the number of series modules in the novel switch valve before N2 series modules are not configured.
CN202310019815.3A 2023-01-06 2023-01-06 Novel switch valve and control method Pending CN116232078A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202310019815.3A CN116232078A (en) 2023-01-06 2023-01-06 Novel switch valve and control method
PCT/CN2023/080609 WO2024145991A1 (en) 2023-01-06 2023-03-09 Switch module, switch valve string and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310019815.3A CN116232078A (en) 2023-01-06 2023-01-06 Novel switch valve and control method

Publications (1)

Publication Number Publication Date
CN116232078A true CN116232078A (en) 2023-06-06

Family

ID=86586535

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310019815.3A Pending CN116232078A (en) 2023-01-06 2023-01-06 Novel switch valve and control method

Country Status (1)

Country Link
CN (1) CN116232078A (en)

Similar Documents

Publication Publication Date Title
Ferrera et al. A converter for bipolar DC link based on SEPIC-Cuk combination
CN107223304B (en) Multilevel converter with energy storage
CN109494752B (en) Centralized resistance energy consumption device and control method thereof
CN205982459U (en) MMC developments sub - modular unit of simulation and transverter with topology switching ability
CN106849717A (en) Striding capacitance tri-level single electrode current module
CN204046460U (en) A kind of novel Modularized multi-level converter sub-module topology
CN209787067U (en) Brake module, brake circuit, current conversion power unit, converter valve and system
CN109449997B (en) Modular high-power shore power supply system
CN112769122A (en) Voltage compensation type energy storage system charging and discharging testing device
CN112290526A (en) Direct current collector used as offshore wind power energy management hub
CN110994974B (en) Low-loss modular multi-level direct current-direct current converter and submodule thereof
CN210744737U (en) Modular submodule topology of direct-current energy discharge device
CN112865046A (en) Multifunctional multiport hybrid direct current breaker and control method
CN104993683A (en) Modular multilevel converter submodule circuit
US20230253877A1 (en) Power factor correction and dc-dc multiplexing converter and uninterruptible power supply including the same
CN113676061A (en) Dynamic balance type converter system and control method thereof
CN116131647A (en) Output voltage generation method and system of converter
CN106505899B (en) Neutral point clamp tri-level single electrode current module
CN113037081B (en) Modular high-voltage transmission ratio direct-current transformer topological structure and control method
CN116232078A (en) Novel switch valve and control method
CN110875683A (en) Redundant staggered parallel DC-DC converter and control method thereof
CN115473265A (en) Battery energy storage circuit and system
CN113726162A (en) Series network type transformer based on voltage reduction type public direct current bus
CN109617109B (en) Method for analyzing direct-current disconnection fault of multi-terminal flexible direct-current power distribution system
Wang et al. Fault ride-through scheme and control strategy of multilevel voltage-balancing DC-DC converter

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination