CN109950940B - Valve block charging device and valve block charging control method - Google Patents
Valve block charging device and valve block charging control method Download PDFInfo
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- CN109950940B CN109950940B CN201711387068.XA CN201711387068A CN109950940B CN 109950940 B CN109950940 B CN 109950940B CN 201711387068 A CN201711387068 A CN 201711387068A CN 109950940 B CN109950940 B CN 109950940B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a valve group charging device and a valve group charging control method, the device comprises a printed circuit board, a controller, a valve group to be charged, a power switch and a charging power supply, the valve group to be charged, the power switch and the charging power supply are arranged on the printed circuit board, the printed circuit board is provided with an optical fiber interface, the valve group to be charged comprises at least two charging sub-modules which are connected in parallel or in series, each charging sub-module is provided with a charging circuit, the controller is communicated with a plurality of charging sub-modules through the optical fiber interface and is used for sending charging control signals to each charging sub-module in turn, the charging sub-modules respond to the charging control signals to start the corresponding charging circuits, the valve group charging device and the valve group charging control method can charge each sub-module alternately without simultaneously charging all the sub-modules at one time, so that higher charging voltage is not needed, the output capacity required by the charging power supply is reduced, and the charging cost is reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a valve bank charging device and a valve bank charging control method.
Background
The modularized multi-level voltage source converter is formed by cascading a plurality of sub-modules with the same structure, wherein the valve group is a main component in the modularized multi-level voltage source converter and mainly comprises the sub-modules formed by semiconductor devices capable of being turned off.
Because the converter station needs extremely high direct current charging voltage when charging at the direct current side, the charging power supply needs to have very high output capacity and higher cost for a test platform containing a plurality of valve banks.
Disclosure of Invention
Therefore, it is necessary to provide a valve block charging device and a valve block charging control method for solving the problem of excessive charging cost of a multi-valve block test platform.
A valve bank charging device comprises a printed circuit board, a controller, a valve bank to be charged, a power switch and a charging power supply;
the valve group to be charged, the power switch and the charging power supply are arranged on the printed circuit board, and an optical fiber interface is arranged on the printed circuit board;
the valve group to be charged comprises at least two charging sub-modules which are connected in parallel or in series; each charging submodule is provided with a charging circuit;
the controller is communicated with the plurality of charging sub-modules through optical fiber interfaces and is used for sending charging control signals to the charging sub-modules in turn, and the charging sub-modules respond to the charging control signals to start corresponding charging circuits;
the first end of the power switch is connected with the anode of the charging power supply, and the second end of the power switch is connected with the first charging submodule of the valve bank to be charged;
and the negative electrode of the charging power supply is connected with the last charging submodule of the valve bank to be charged.
In one embodiment, the charging circuit of the nth charging submodule comprises a first switch, a second switch and a charging capacitor;
the first switch and the second switch are connected in series and then connected in parallel with the charging capacitor, and the connection point of the first switch and the second switch is the midpoint of the charging submodule;
when the first switch is conducted, the charging capacitor is charged; when the second switch is conducted, the second end of the power switch is connected with the midpoint of the (N + 1) th charging submodule;
the negative electrode of the charging capacitor of the Nth charging submodule is connected with the midpoint of the (N + 1) th charging submodule;
and the output end of a second switch of the Nth charging submodule is connected with the midpoint of the (N + 1) th charging submodule.
In one embodiment, the first switch and the second switch are semiconductor switches that can be turned off.
In one embodiment, the first switch and the second switch are any one of IGBT, IEGT and IGCT power devices.
A valve group charging control method is applied to the valve group charging device, and comprises the following steps:
controlling the power switch to be closed;
reading the voltage of two ends of a charging capacitor in all charging sub-modules in a valve group to be charged;
when the voltage at two ends of a charging capacitor in each charging submodule reaches the preset wake-up voltage of the charging submodule, alternately controlling at least one charging submodule in the valve bank to be charged to be switched on, and charging the switched-on charging submodule;
and when the charging voltage of the valve bank to be charged reaches a preset value, controlling the power switch to be switched off.
In one embodiment, the step of charging the enabled charging submodule includes:
controlling a first switch of the opened charging submodule to be closed, and charging the opened charging submodule;
and when the voltage of the charging capacitor of the switched-on charging submodule reaches a preset requirement, controlling the first switch of the switched-on charging submodule to be switched off.
In one embodiment, when the charging time of each charging submodule reaches the preset charging time, a first switch of the currently-charged charging submodule is controlled to be switched off, and a second switch of the currently-charged charging submodule is controlled to be switched on; the preset charging time is set according to the charging capacity of the charging power supply.
In one embodiment, the method further comprises:
monitoring the state of each charging submodule;
and when the charging submodule breaks down, starting a preset protection action.
In one embodiment, the predetermined protection action includes turning off a power switch.
In one embodiment, the method comprises:
when the charging submodule is detected to be in fault, judging the position of the charging submodule in fault and the type of the fault;
and sending an alarm according to the position of the charging submodule with the fault and the type of the fault.
The valve bank charging device and the valve bank charging control method can alternately charge the charging sub-modules, and all the charging sub-modules do not need to be charged at one time, so that higher charging voltage is not needed, the output capacity of a charging power supply is reduced, and the charging cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a valve block charging device in one embodiment;
fig. 2 is a schematic circuit diagram of a valve block charging arrangement in one embodiment;
fig. 3 is a schematic circuit diagram of a valve block charging device in another embodiment;
fig. 4 is a flowchart illustrating a valve pack charging control method according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a valve block charging device in an embodiment. As shown in fig. 1, a valve pack charging apparatus includes a printed circuit board 10, a controller 30, a valve pack 50 to be charged, a power switch 70, and a charging power supply 90.
The valve group 50 to be charged, the power switch 70 and the charging power supply 90 are disposed on the printed circuit board 10, and the printed circuit board 10 is provided with an optical fiber interface 102.
The printed circuit board 10 is a provider of electrical connection of electronic components, and is used for realizing connection between the components.
The controller 30 communicates with the valve set 50 to be charged through the optical fiber interface 102 on the printed circuit board 10, and can control the operating state of the valve set 50 to be charged, wherein the operating state of the valve set 50 to be charged is divided into two states, i.e., a charging state and a non-charging state.
One end of the power switch 70 is connected to the valve set 50 to be charged, and the other end is connected to the charging power source 90, the charging power source 90 can charge the valve set 50 to be charged by controlling the on/off of the power switch 70, and when the power switch 70 is turned off, the charging power source 90 stops charging the valve set 50 to be charged.
Fig. 2 is a schematic circuit diagram of a valve block charging device in one embodiment. As shown in fig. 2, the valve block charging device includes a valve block 50 to be charged, a power switch 70 connected to the valve block 50 to be charged, and a charging power source 90 connected to the power switch 70.
The valve set 50 to be charged comprises at least two charging submodules 502 connected in parallel or in series, and each charging submodule 502 is provided with a charging circuit.
The controller communicates with the plurality of charging sub-modules 502 through the optical fiber interface, and is configured to send a charging control signal to each charging sub-module 502 in turn, and the charging sub-modules 502 start corresponding charging circuits in response to the charging control signal.
Specifically, the controller communicates with the plurality of charging sub-modules through the optical fiber interface, the charging sub-modules send charging control signals to the charging sub-modules in turn, the charging sub-modules control the working states of the corresponding charging circuits according to the charging control signals sent by the controller, the charging control signals comprise charging and stopping charging, when the charging sub-modules receive the charging signals, the corresponding charging circuits are started to perform charging, and when the received signals are stopping charging, the corresponding charging circuits stop charging.
The first end of the power switch 70 is connected to the positive pole of the charging power supply 90, the second end of the power switch 70 is connected to the first charging submodule of the valve set 50 to be charged, and the negative pole of the charging power supply 90 is connected to the last charging submodule of the valve set to be charged.
The modular multilevel voltage source converter mainly comprises a valve group, the valve group mainly comprises a charging submodule consisting of turn-off semiconductor devices, and because a converter station needs extremely high direct-current charging voltage when charging at a direct-current side, the voltage of the charging submodule can only reach half of rated voltage after natural charging is finished, a turn-on pulse or a turn-off pulse is sent to the charging submodule of the converter station, so that the charging submodule has certain impact when working, particularly, the charging submodule of the converter station is too fast when the charging submodule is from low voltage to high voltage, and the service life of the charging submodule is influenced by overlarge charging current. The valve bank charging device can alternately charge the charging sub-modules, and all the charging sub-modules are not required to be charged at one time, so that higher charging voltage is not required, the output capacity required by a charging power supply is reduced, and the charging cost is reduced.
Fig. 3 is a schematic circuit diagram of a valve block charging device in another embodiment. As shown in fig. 3, the charging submodule of the valve block charging device comprises a first switch 202, a second switch 204 and a charging capacitor 206.
The first switch 202 and the second switch 204 are connected in series and then connected in parallel with the charging capacitor 206, and the connection point of the first switch 202 and the second switch 204 is the middle point of the charging submodule.
And when the second switch is conducted, the second end of the power switch is connected with the midpoint of the (N + 1) th charging submodule.
The negative electrode of the charging capacitor of the Nth charging submodule is connected with the midpoint of the (N + 1) th charging submodule
And the output end of a second switch of the Nth charging submodule is connected with the midpoint of the (N + 1) th charging submodule. Wherein N is a positive integer.
Specifically, when N is 1, the first switch 202 is turned on to charge the charging capacitor 206 of the first charging sub-module 502, and when the second switch 204 is turned on, the second terminal of the power switch 70 is connected to the midpoint of the second charging sub-module 504.
When the first switch 202 is turned on, the charging power supply 90 charges the charging capacitor 206 of the first charging sub-module 502, and at the same time, a part of current flows out from the charging capacitor and flows into the second charging sub-module 504 through the midpoint of the second charging sub-module 502, and at this time, if the first switch of the second charging sub-module 504 is turned on, the charging power supply 90 can also charge the charging capacitor of the second charging sub-module.
Specifically, when N is 1, the negative electrode of the charging capacitor 206 of the first charging submodule 502 is connected to the midpoint of the second charging submodule 504, and the output end of the second switch 204 of the first charging submodule 502 is connected to the midpoint of the second charging submodule 504.
When the second switch 204 of the first charging submodule 502 is closed, it indicates that the first charging submodule 502 has been charged or the voltage of the charging capacitor has reached the preset requirement, and is close to the maximum voltage of the charging capacitor, and at this time, the current of the charging power supply can flow into the second charging submodule through the second switch of the first charging submodule 502, and charges the charging point capacitor of the second charging submodule.
In this embodiment, the negative electrode of the charging capacitor of the nth charging sub-module is connected to the midpoint of the (N + 1) th charging sub-module, when the charging power supply charges the charging capacitor of the nth charging sub-module, if the controller also turns on other charging sub-modules, the controller can connect with the charging sub-module in the charging state to enable part of the current to flow out again through the charging capacitor of the charging sub-module being charged, and then flow into the charging capacitors of the other turned-on charging sub-modules through the midpoint of the other charging sub-modules connected to the negative electrode of the charging sub-module capacitor being charged to charge the charging capacitor. And the output end of the second switch of the charging submodule is connected with the midpoint of the (N + 1) th charging submodule, when the charging submodule which is being charged finishes charging, the second switch of the charging submodule is closed, and the charging power supply charges the (N + 1) th charging submodule.
In another embodiment, the first switch 202 and the second switch 204 are semiconductor switches that can be turned off.
Specifically, a turn-off semiconductor device is also called a fully controlled device, and is a power electronic device capable of controlling both turning-on and turning-off of the device by a control signal, and such devices include a gate turn-off thyristor, a power field effect transistor, an insulated gate bipolar transistor, and the like.
In yet another embodiment, the first switch 202 and the second switch 204 are any one of IGBT, IEGT, and IGCT power devices.
Specifically, an igbt (insulated Gate Bipolar transistor) and an insulated Gate Bipolar transistor are composite fully-controlled voltage-driven power semiconductor devices composed of BJTs (Bipolar transistors) and MOS (insulated Gate field effect transistors), and have the advantages of both high input impedance of MOSFETs and low on-state voltage drop of GTRs. The GTR saturation voltage is reduced, the current carrying density is high, but the driving current is large; the MOSFET has small driving power, high switching speed, large conduction voltage drop and small current carrying density. The IGBT integrates the advantages of the two devices, and has small driving power and reduced saturation voltage. The method is very suitable for being applied to the fields of current transformation systems with direct-current voltage of 600V or more, such as alternating-current motors, frequency converters, switching power supplies, lighting circuits, traction transmission and the like.
Iegt (injection Enhanced Gate transistor) is an IGBT power electronic device with a withstand voltage of 4KV or more, and a low-pass voltage is realized by adopting an injection enhancement structure, so that a large-capacity power electronic device is dramatically developed. The IEGT has potential development prospect as a MOS series power electronic device, has the characteristics of low loss, high-speed action, high voltage resistance, intelligentization of active gate drive and the like, and has the characteristic of self-current sharing by adopting a groove structure and a plurality of chips in parallel connection, so that the IEGT has potential in the aspect of further expanding current capacity.
An Integrated Gate Commutated Thyristor (IGCT) is a new type of power semiconductor switching device developed by a medium-voltage frequency converter for use in a huge power electronic assembly (Integrated Gate Commutated thyristor + Gate unit). The IGCT integrates the high-speed switching characteristic of an IGBT (insulated gate bipolar transistor) and the high blocking voltage and low conduction loss characteristic of a GTO (gate turn-off thyristor), and a general trigger signal is transmitted to the IGCT unit through an optical fiber. In the phase modules of the active rectifying unit of the ACS6000, each phase module consists of an IGCT (integrated gate commutated thyristor), a freewheeling diode, a clamping capacitor and a damping resistor, and an independent gate pole power supply unit GUSP (voltage source converter) provides energy for the phase modules. The IGCT has the characteristics of large current, high voltage of resistance and disconnection, high switching frequency, high reliability, compact structure, low conduction loss and the like, and has low cost, high yield and good application prospect.
Fig. 4 is a flowchart illustrating a valve pack charging control method according to an embodiment. As shown in fig. 4, the valve block charging control method includes the following steps:
and S202, controlling the power switch to be closed.
When the charging operation is started, the controller firstly controls the power switch to be closed, and the current of the charging power supply flows to each charging submodule through the power switch.
And S204, reading the voltage of the two ends of the charging capacitor in all the charging sub-modules in the valve group to be charged.
When the power switch is turned on, the current of the charging power supply flows into each charging submodule through the power switch, the charging capacitor of each charging submodule stores energy, and the controller reads the voltage of two ends of the charging capacitor of each charging submodule.
And S206, when the voltage at two ends of the charging capacitor in each charging submodule reaches the preset wake-up voltage of the charging submodule, alternately controlling at least one charging submodule in the valve bank to be charged to be switched on, and charging the switched-on charging submodule.
Specifically, the charging capacitors of the charging sub-modules are preset with wake-up voltages, that is, the charging sub-modules are in a locked state before being awakened, each charging sub-module needs to reach a certain voltage before being awakened, and when the voltages of the charging capacitors of the charging sub-modules reach the preset wake-up voltage, each charging sub-module is in a wake-up state.
The controller is communicated with each charging submodule in the valve bank to be charged through an optical fiber interface on the printed circuit board, and when the voltage of a charging capacitor of each charging submodule reaches the awakening voltage of the charging submodule, at least one charging submodule in the valve bank to be charged is alternately controlled to be opened, and the opened charging submodule is charged.
Optionally, when the controller simultaneously turns on two charging sub-modules, the current of the charging power supply flows into the turned-on two charging sub-modules through the power switch to charge, the charging sub-modules are connected in series or in parallel, and the current can flow into the next charging sub-module after passing through the previous charging sub-module.
And S208, when the charging voltage of the valve group to be charged reaches a preset value, controlling the power switch to be switched off.
Specifically, a preset value is set for the charging voltage of the valve bank to be charged, and when the charging power supply charges each charging submodule and the sum of the voltages at the two ends of the charging capacitor of each charging submodule reaches the preset charging voltage of the valve bank to be charged, the power switch is controlled to be turned off, and charging is stopped.
The charging valve bank control method comprises the steps that a valve bank to be charged is provided with a plurality of charging sub-modules which are connected in series or in parallel, when the output voltage of a charging power supply reaches the awakening voltage of the charging sub-modules, all the charging sub-modules are awakened, then at least one charging sub-module is controlled to be alternately turned on, so that the charging power supply charges the turned-on charging sub-modules, and when the valve bank to be charged reaches a preset value, a power switch is turned off, and charging is stopped.
In one embodiment, the step of charging the enabled charging submodule includes: and controlling a first switch of the opened charging submodule to be closed, and charging the opened charging submodule.
And when the voltage of the charging capacitor of the switched-on charging submodule reaches the preset requirement, controlling the first switch of the switched-on charging submodule to be switched off.
Specifically, when the first switch of the charging submodule is turned off, the charging power supply is indicated to charge the charging capacitor of the charging submodule, and when the voltage of the turned-on charging submodule is detected to be close to the preset voltage value of the charging submodule, the first switch of the charging submodule is controlled to be turned off, and the charging of the charging submodule is stopped.
In another embodiment, when the charging time of each charging submodule reaches the preset charging time, the first switch of the charging submodule which is currently charged is controlled to be switched off, the second switch is controlled to be switched on, and the preset charging time is set according to the charging capacity of the charging power supply.
Specifically, the controller presets charging time for each charging submodule according to the charging capacity of the charging power supply, sets the number of charging submodules which are simultaneously switched on according to the charging capacity of the charging power supply, and controls a first switch of the currently-charged charging submodule to be switched off to finish charging and a second switch to be switched on when the charging time of each charging submodule reaches the preset charging time, so that the current of the charging power supply flows into the next switched-on charging submodule through the second switch of the charging submodule to charge the next switched-on charging submodule.
With continued reference to fig. 4, the valve set charging control method further includes the following steps:
and S210, monitoring the state of each charging submodule.
Specifically, the charging submodule includes states of: a lockout state, a wake-up state, a charge state, and an exception state. The locking state refers to that before charging is not carried out, the power switch is not closed, and all the charging sub-modules are in the locking state. The awakening state is that when the charging operation is started, the power switch is closed, the current of the charging power supply flows into each charging submodule, and when the voltage of the charging capacitor of each charging submodule reaches the preset awakening voltage, each charging submodule is in the awakening state. The charging state refers to that after all the charging sub-modules are awakened, the controller alternately controls at least one charging sub-module in the valve group to be charged to be turned on and charges the turned-on charging sub-module. The abnormal state refers to the abnormal condition of the charging submodule, including charging fault, circuit fault and the like.
And S212, starting a preset protection action when the charging submodule fails.
When the state of the charging submodule is detected to be in an abnormal state, the charging submodule is indicated to be in a fault state, the controller starts a preset protection action, and the circuit is protected.
In one embodiment, the predetermined protection action includes turning off a power switch.
When a fault occurs, the controller starts a preset protection action, the protection action comprises the disconnection of a power switch, the work of the whole circuit can be stopped by disconnecting the power switch, and the charging submodule without the fault is protected.
S214, when the charging submodule is detected to be in fault, judging the position of the charging submodule in fault and the type of the fault.
When the controller detects that the charging sub-modules have faults, the controller judges which charging sub-module has faults according to the abnormal conditions, and obtains the types of the faults of the charging sub-modules according to the abnormal conditions.
And S216, giving an alarm according to the position of the charging submodule with the fault and the type of the fault.
And after the specific position of the charging submodule with the fault and the type of the fault are obtained, the controller sends out an alarm and fault information to be overhauled.
According to the valve bank charging control method, whether faults occur can be judged by detecting the states of the charging sub-modules, when the controller detects that the charging sub-modules fail, the charging sub-modules are judged according to abnormal conditions, and the types of the faults occurring in the charging sub-modules are obtained according to the abnormal conditions, so that an alarm is given, a worker can conveniently and timely overhaul, the faults are solved, and the normal work of a circuit is guaranteed.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A valve bank charging device is characterized by comprising a printed circuit board, a controller, a valve bank to be charged, a power switch and a charging power supply;
the valve group to be charged, the power switch and the charging power supply are arranged on the printed circuit board, and an optical fiber interface is arranged on the printed circuit board;
the valve group to be charged comprises at least two charging sub-modules which are connected in parallel or in series; the charging sub-modules are composed of semiconductor devices which can be turned off, and each charging sub-module is provided with a charging circuit;
the controller is communicated with the plurality of charging sub-modules through optical fiber interfaces and is used for sending charging control signals to the charging sub-modules in turn, and the charging sub-modules respond to the charging control signals to start corresponding charging circuits; the charging control signal comprises a charging signal and a charging stopping signal;
the first end of the power switch is connected with the anode of the charging power supply, and the second end of the power switch is connected with the first charging submodule of the valve bank to be charged;
the negative electrode of the charging power supply is connected with the last charging submodule of the valve bank to be charged;
the charging circuit of the Nth charging submodule comprises a first switch, a second switch and a charging capacitor; the output end of a second switch of the Nth charging submodule is connected with the midpoint of the (N + 1) th charging submodule; the negative electrode of the charging capacitor of the Nth charging submodule is connected with the midpoint of the (N + 1) th charging submodule; when the charging power supply charges the charging capacitor of the Nth charging submodule, other charging submodules are turned on, part of current flows out again through the charging capacitor of the charging submodule in the charging state by being connected with the charging submodule in the charging state, and flows into the charging capacitors of other turned-on charging submodules through the middle points of the other charging submodules connected with the negative electrode of the capacitor of the charging submodule in the charging state to charge the charging capacitors; and when the charging submodule which is being charged finishes charging, the second switch of the charging submodule is closed, and the charging power supply charges the (N + 1) th charging submodule.
2. The valve group charging device according to claim 1, wherein the first switch and the second switch are connected in series and then connected in parallel with the charging capacitor, and a connection point of the first switch and the second switch is a midpoint of the charging submodule;
when the first switch is conducted, the charging capacitor is charged; when the second switch is conducted, the second end of the power switch is connected with the midpoint of the (N + 1) th charging submodule.
3. The valve block charging arrangement according to claim 1, wherein the first and second switches are any one of IGBTs, IEGTs and IGCT power devices.
4. A valve block charging control method applied to the valve block charging apparatus according to any one of claims 1 to 3, the valve block charging method comprising:
controlling the power switch to be closed;
reading the voltage of two ends of a charging capacitor in all charging sub-modules in a valve group to be charged; the charging submodule consists of a semiconductor device capable of being turned off;
when the voltage at two ends of a charging capacitor in each charging submodule reaches the preset wake-up voltage of the charging submodule, alternately controlling at least one charging submodule in the valve bank to be charged to be switched on, and charging the switched-on charging submodule; when two charging sub-modules are switched on, the current of the charging power supply flows into the two switched-on charging sub-modules through the power switch to be charged, the charging sub-modules are connected in series or in parallel, part of the current flows out through the charging capacitor of the charging sub-module which is being charged, passes through the middle point of other charging sub-modules connected with the negative electrode of the capacitor of the charging sub-module which is being charged and then flows into the charging capacitors of the other switched-on charging sub-modules to charge the charging capacitors;
and when the charging voltage of the valve bank to be charged reaches a preset value, controlling the power switch to be switched off.
5. The valve block charging control method according to claim 4, wherein the step of charging the enabled charging submodule comprises:
controlling a first switch of the opened charging submodule to be closed, and charging the opened charging submodule;
and when the voltage of the charging capacitor of the switched-on charging submodule reaches a preset requirement, controlling the first switch of the switched-on charging submodule to be switched off.
6. The valve group charging control method according to claim 4, characterized in that when the charging time of each charging submodule reaches the preset charging time, the first switch of the charging submodule currently being charged is controlled to be opened, and the second switch is controlled to be closed; the preset charging time is set according to the charging capacity of the charging power supply.
7. The valve block charge control method of claim 4, further comprising:
monitoring the state of each charging submodule;
and when the charging submodule breaks down, starting a preset protection action.
8. The valve block charge control method according to claim 7, characterized in that the preset protection action comprises opening a power switch.
9. The valve block charge control method according to claim 7, characterized in that it comprises:
when the charging submodule is detected to be in fault, judging the position of the charging submodule in fault and the type of the fault;
and sending an alarm according to the position of the charging submodule with the fault and the type of the fault.
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| CN201711387068.XA CN109950940B (en) | 2017-12-20 | 2017-12-20 | Valve block charging device and valve block charging control method |
| PCT/CN2018/101986 WO2019119844A1 (en) | 2017-12-20 | 2018-08-23 | Valve set charging device and valve set charging control method |
| KR1020207021073A KR102374699B1 (en) | 2017-12-20 | 2018-08-23 | Valve group filling device and valve group filling control method |
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| CN201711387068.XA CN109950940B (en) | 2017-12-20 | 2017-12-20 | Valve block charging device and valve block charging control method |
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| CN109950940B true CN109950940B (en) | 2021-10-08 |
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| CN203720321U (en) * | 2014-01-21 | 2014-07-16 | 清华大学 | Power hedging test device for modularized multi-level converter valves |
| CN105915076A (en) * | 2016-05-19 | 2016-08-31 | 东南大学 | Modular multi-level current converter and control method thereof |
| CN106602912A (en) * | 2017-01-10 | 2017-04-26 | 华北电力大学（保定） | Capacitance and voltage self-ordering modular multilevel converter |
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| CA2838775C (en) | 2011-06-10 | 2016-08-16 | Abb Technology Ag | Method for energizing a chain-link converter, controller, computer programs and computer program products |
| US9018926B1 (en) * | 2012-11-30 | 2015-04-28 | Rockwell Collins, Inc. | Soft-switched PFC converter |
| CN103051167B (en) | 2012-12-12 | 2015-01-14 | 广东电网公司电力科学研究院 | MMC-based (modular multilevel converter-based) UPQC (unified power quality conditioner) charge-starting method |
| CN103560687B (en) * | 2013-09-27 | 2016-05-18 | 株洲变流技术国家工程研究中心有限公司 | Modular multi-level converter system, and control system and control method |
| CN104143831B (en) * | 2014-07-07 | 2016-07-06 | 华南理工大学 | A kind of pre-charge method of the 3rd end modularization multi-level converter |
| CN105356731A (en) * | 2015-12-24 | 2016-02-24 | 国家电网公司 | Submodule triggering methods for high-voltage direct-current transmission system of modular multilevel converter |
| CN105790228B (en) * | 2016-04-20 | 2019-03-01 | 广州供电局有限公司 | Converter valve submodule and modularization multi-level converter |
| CN106941315A (en) * | 2016-12-02 | 2017-07-11 | 中国电力科学研究院 | A kind of Modular multilevel converter MMC precharge control methods and its control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203720321U (en) * | 2014-01-21 | 2014-07-16 | 清华大学 | Power hedging test device for modularized multi-level converter valves |
| CN105915076A (en) * | 2016-05-19 | 2016-08-31 | 东南大学 | Modular multi-level current converter and control method thereof |
| CN106602912A (en) * | 2017-01-10 | 2017-04-26 | 华北电力大学（保定） | Capacitance and voltage self-ordering modular multilevel converter |
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| KR20200101430A (en) | 2020-08-27 |
| WO2019119844A1 (en) | 2019-06-27 |
| KR102374699B1 (en) | 2022-03-16 |
| CN109950940A (en) | 2019-06-28 |
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