CN110994633B - Chained SVG chain link module bypass control system and control method thereof - Google Patents

Chained SVG chain link module bypass control system and control method thereof Download PDF

Info

Publication number
CN110994633B
CN110994633B CN201911135258.1A CN201911135258A CN110994633B CN 110994633 B CN110994633 B CN 110994633B CN 201911135258 A CN201911135258 A CN 201911135258A CN 110994633 B CN110994633 B CN 110994633B
Authority
CN
China
Prior art keywords
svg
unit
link module
bypass
chain link
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.)
Active
Application number
CN201911135258.1A
Other languages
Chinese (zh)
Other versions
CN110994633A (en
Inventor
李阳
彭国平
史奔
段博
孟庆良
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.)
Guangdong Anpu Electric Power Technology Co ltd
Original Assignee
Guangdong Anpu Electric Power Technology Co ltd
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 Guangdong Anpu Electric Power Technology Co ltd filed Critical Guangdong Anpu Electric Power Technology Co ltd
Priority to CN201911135258.1A priority Critical patent/CN110994633B/en
Publication of CN110994633A publication Critical patent/CN110994633A/en
Application granted granted Critical
Publication of CN110994633B publication Critical patent/CN110994633B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a bypass control system and a bypass control method for chain type SVG chain link modules, wherein the bypass control system comprises a three-phase SVG device, a power supply detection unit, a storage unit and a control unit; the three-phase SVG device comprises three chain type SVG branches which are mutually connected, wherein the chain type SVG branches comprise a plurality of SVG chain link modules which are connected end to end, and each SVG chain link module comprises an H bridge power unit and a bypass switch which is connected with the H bridge power unit in parallel; the control unit is respectively and electrically connected with the storage unit, the power supply detection unit and the H bridge power unit of each SVG chain link module to control the three-phase SVG device to operate; and according to the redundancy condition of the SVG chain link module, a fault chain link module is automatically bypassed, the fault rate of equipment is reduced, and the operation reliability of the system is improved.

Description

Chained SVG chain link module bypass control system and control method thereof
Technical Field
The invention relates to the field of electrical equipment, in particular to a chain type SVG chain link module bypass control system and a control method thereof.
Background
With the development of computer technology and power conversion technology, a large number of medium-high voltage high-power nonlinear devices are widely applied, and the use of the devices brings convenience to people and also causes a plurality of power quality problems, such as harmonic waves, reactive pollution, voltage fluctuation flicker and the like.
Therefore, as a representative example of the current reactive compensation field, a Static Var Generator (SVG) can effectively solve the above problems and improve the quality of electric energy.
Among numerous topological structures of SVG, the cascaded multilevel topology uses low-voltage and low-capacity devices to realize high-voltage and high-capacity output, so that the cascaded multilevel topology has wide application prospect in medium-high voltage occasions.
The cascade type multi-level chain type SVG is based on the inverter principle, the alternating current output ends of a plurality of H-bridge power units are sequentially connected end to end, and multi-level output is controlled through PWM signal input, so that the voltage of a grid-connected point is improved, and high-voltage large-capacity output is realized. In the operation process of the system, when a chain link module in the system breaks down, the whole system is disconnected, and the reliability of the system is influenced, so that a bypass switch connected with the H bridge power unit in parallel is generally connected to the alternating current output end of the H bridge power unit, and when the SVG chain link module breaks down, the bypass switch is closed, so that the H bridge power unit of the SVG chain link module is in short circuit, but other SVG chain link modules are not influenced.
The control unit can record the on-off state of the bypass switch of each SVG chain link module, and then calculates the phase shift angle and the given module voltage according to the condition of the whole three-phase SVG device to control the operation of each non-short-circuit H-bridge power unit.
The bypass switch is generally a device which has a power failure retention function and cannot be recovered, and the device must be manually opened, so that the bypass switch which is originally in failure can be prevented from being disconnected due to disorder of an internal circuit. When the SVG system is off-line, after workers repair or replace SVG chain link modules, the workers need to manually operate the control unit in the past, and the on-off state record of the control unit about the bypass switches of the SVG chain link modules is rewritten. The SVG system inserts the electric wire netting once more, and the control unit controls three-phase SVG device again, and this mode operation is inconvenient, and has the hidden danger that the staff forgot or changed the wrong bypass switch state record, causes the system fault, appears the module overvoltage damage phenomenon even.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art, and provides a chain type SVG chain link module bypass control system and a control method thereof, which can automatically recognize and change the on-off condition of each SVG chain link module bypass and improve the operation reliability of the system.
The technical scheme adopted by the invention is as follows:
a chained SVG link module bypass control system comprising:
the three-phase SVG device comprises three chain type SVG branches which are mutually connected, wherein the chain type SVG branches comprise a plurality of SVG chain link modules which are connected end to end, and each SVG chain link module comprises an H bridge power unit and a bypass switch which is connected with the H bridge power unit in parallel;
the power supply detection unit is used for detecting the power-on condition of the H-bridge power unit;
the storage unit records the on-off condition of the bypass switch of each SVG link module;
and the control unit is electrically connected with the storage unit, the power supply detection unit and the H-bridge power unit of each SVG chain link module respectively so as to control the operation of the three-phase SVG device.
Still including SVG running state monitoring unit and the drive that detects SVG chain link module running state the bypass drive unit of bypass switch break-make, H bridge power unit does the bypass drive unit power supply, SVG running state monitoring unit respectively with control unit, bypass drive unit electric connection.
Bypass drive unit includes energy storage component, charging switch and driver part, H bridge power unit passes through the switch that charges does the energy storage component charges, the energy storage component does the driver part power supply, SVG running state monitoring unit with driver part connects with control the driver part drive the bypass switch break-make, and bypass switch with the break-make state of charging switch is opposite.
The energy storage component is electrically connected with the control unit, and the electric quantity detection unit is electrically connected with the control unit.
The bypass switch further comprises a bypass voltage detection unit for detecting the voltage conditions at two ends of the bypass switch, and the bypass voltage detection unit is electrically connected with the control unit.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
according to the invention, when the maintenance or replacement of the SVG link module is completed, the power supply is prepared for the SVG link module in the chain type SVG branch, the power supply detection unit detects the power-on condition of the H bridge power unit, when the preparation of the H bridge power unit is completed, the power supply detection unit detects that the power-on voltage of the H bridge power unit is greater than the preset value, the control unit can change the recording content of the storage unit, the control unit calculates the phase shift angle and the module voltage setting according to the recording content of the storage unit, and controls the operation of each non-short-circuited H bridge power unit, so that the design improves the working efficiency of workers, is convenient to operate, and can work after the preparation condition of the SVG link module is accurately known, and the operation reliability of the system is improved;
a control method of a bypass control system of a chain type SVG chain link module comprises the following steps:
a1, the control unit reads the on-off condition of the bypass switch of each SVG chain link module in the storage unit;
a2, the power supply detection unit outputs the power-on condition of the H-bridge power unit to the control unit, and the control unit changes the on-off condition of the bypass switch of each SVG chain link module in the storage unit according to the power-on condition of each H-bridge power unit;
and A3, the control unit outputs signals according to the updated on-off condition of the bypass switch of each SVG chain link module to control the operation of the H-bridge power unit in the corresponding SVG chain link module.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
according to the invention, when the maintenance or replacement of the SVG link module is completed, the power supply of the SVG link module is prepared in the chain type SVG branch, the control unit changes the on-off condition of the bypass switch of each SVG link module according to the power-on condition of each H bridge power unit, the control unit calculates the phase shift angle and the module voltage setting according to the recording content of the storage unit and controls each non-short-circuited H bridge power unit to operate, the design improves the working efficiency of workers, is convenient to operate, and works after accurately knowing the preparation condition of the SVG link module, so that the operation reliability of the system is improved;
a control method of a bypass control system of a chain type SVG chain link module comprises the following steps:
b1, the SVG operation state monitoring unit detects the operation state of the SVG link module;
b2, when the SVG running state monitoring unit detects that the running state of the SVG link module has a fault, the SVG running state monitoring unit uploads a fault signal to the control unit;
b3, the control unit controls each H bridge power unit to reset, records the reset times and returns to B1;
in B2, when the SVG running state monitoring unit detects that the running state of the SVG chain link module has a fault, the number of resetting times is judged, if the number of resetting times does not exceed a preset resetting threshold value, the operation enters B3, and if the number of resetting times exceeds the preset resetting threshold value, the operation enters B4;
and B4, the control unit sends an instruction to the SVG running state monitoring unit to control the closing of a bypass switch of the failed SVG link module.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
according to the invention, when the SVG operation state monitoring unit detects that the SVG chain link module has a fault, the control unit firstly controls each H bridge power unit to reset and operate, restarts the operation after pausing for a certain time, and circulates for several times to prevent fault false alarm triggered occasionally, when the fault still exists after circulating for a certain number of times, the control unit controls the bypass switch of the SVG chain link module with the fault to be closed again, and a worker maintains and replaces the related SVG chain link module.
A control method of a bypass control system of a chain type SVG chain link module comprises the following steps:
c1, detecting the residual capacity of the energy storage component by the capacity detection unit;
c2, when the residual electric quantity of the energy storage component is lower than a low electric quantity limit value, and the SVG operation state monitoring unit detects that the operation state of the SVG chain link module has a fault;
and C3, the control unit controls the H bridge power unit of each SVG chain link module to suspend operation.
The method also comprises the following steps between the step C1 and the step C2:
D. when the residual electric quantity of the energy storage component is lower than the low electric quantity warning value, the control unit sends out a prompt warning.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
in the invention, the electric quantity detection unit is required to detect the residual electric quantity of the energy storage component all the time, the electric quantity of the energy storage component is ensured to be enough to supply power for the bypass driving unit, the bypass switch can be triggered to be closed, when the electric quantity is lower, an alarm is given, or under the condition of completely insufficient electric quantity, because whether the SVG chain link module breaks down or not can not be known, the bypass short circuit does not exist, in order to prevent the whole system from being broken down due to unpredictable influence of the broken SVG chain link module, the control module controls the H-bridge power unit of each SVG chain link module to pause to operate in time, the reliability and the safety of the system are improved, and meanwhile, each element can also be protected.
A control method of a bypass control system of a chain type SVG chain link module comprises the following steps:
E. when the control unit controls the bypass switch of the failed SVG chain link module to be closed, the bypass voltage detection unit detects the voltage conditions at two ends of the bypass switch, and when the voltage at two ends of the bypass switch is greater than the closed voltage threshold value of the bypass switch, the control unit controls the H-bridge power unit of each SVG chain link module to pause.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
in the invention, the voltage detection unit detects the voltage conditions at two ends of the bypass switch, when the control unit outputs a signal to control the bypass switch of the failed SVG link module to be closed and the voltage value detected by the voltage detection unit is at a higher level, the bypass switch is proved not to respond to the signal output by the control unit, and the control unit controls the H-bridge power unit of each SVG link module to pause in time, thereby improving the reliability and safety of the system and protecting each element.
Drawings
The following further describes embodiments of the present invention with reference to the drawings.
FIG. 1 is a schematic diagram of a chain structure of a chain type SVG chain link module bypass control system.
Fig. 2 is a schematic diagram of an SVG link module of the chained SVG link module bypass control system of the present invention.
FIG. 3 is a schematic diagram of a bypass drive unit of the chained SVG link module bypass control system of the present invention.
Fig. 4 is a flowchart of a control method of a bypass driving unit of the bypass control system of the chained SVG link module according to the present invention.
Fig. 5 is a two-flow diagram of a control method of a bypass drive unit of the chained SVG link module bypass control system of the present invention.
Fig. 6 is a three-flow diagram of a control method of a bypass driving unit of the bypass control system of the chained SVG link module of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1 to 3, a chain type SVG link module bypass control system comprises a three-phase SVG device 1, a power supply detection unit 2, a storage unit 3 and a control unit 4;
the three-phase SVG device 1 comprises three chain type SVG branches 11 which are mutually connected, the chain type SVG branches 11 internally comprise a plurality of SVG chain link modules 12 which are connected end to end, and each SVG chain link module 12 comprises an H bridge power unit 121 and a bypass switch 122 which is connected with the H bridge power unit 121 in parallel;
the power supply detection unit 2 is used for detecting the power-on condition of the H-bridge power unit 121;
the storage unit 3 records the on-off condition of the bypass switch 122 of each SVG link module 12;
the control unit 4 is electrically connected with the storage unit 3, the power supply detection unit 2 and the H-bridge power unit 121 of each SVG link module 12 respectively to control the operation of the three-phase SVG device 1.
The control unit 4 may be a central management terminal including a CPU, peripheral circuits thereof, and an external device, and the storage unit 3 may be a memory such as an EEROM.
According to the invention, when the maintenance or replacement of the SVG link module 12 is completed, the power supply of the SVG link module 12 is prepared in the chain type SVG branch 11, the power supply detection unit 2 detects the power-on condition of the H bridge power unit 121, when the preparation of the H bridge power unit 121 is completed, the power supply detection unit 2 detects that the power-on voltage of the H bridge power unit 121 is greater than a preset value, the control unit 4 can change the recording content of the storage unit 3, the control unit 4 calculates the phase shift angle and the module voltage setting according to the recording content of the storage unit 3, and controls each non-short-circuited H bridge power unit to operate, so that the design improves the working efficiency of workers, is convenient to operate, and can work after the preparation condition of the SVG link module is accurately known, and the operation reliability of the system is improved;
in some embodiments, the system further comprises an SVG running state monitoring unit 5 for detecting the running state of the SVG link module 12 and a bypass driving unit 6 for driving the bypass switch to be switched on and off, the H-bridge power unit 121 supplies power to the bypass driving unit 6, and the SVG running state monitoring unit 5 is electrically connected with the control unit 4 and the bypass driving unit 6 respectively.
The SVG operation status monitoring unit 5 may include a processor, a temperature detecting component electrically connected to the processor, and an electrical detecting component for detecting parameters such as voltage and current of the H-bridge power unit.
Through the detection of overheat, drive fault, overvoltage and the like of power elements such as IGBTs (insulated gate bipolar transistors) of the SVG running state monitoring unit 5, when a fault occurs, the SVG running state monitoring unit can generate a fault request and a bypass request, judges whether the fault occurs according to the detected condition, and reports the fault to a control unit on an upper layer when the fault occurs.
In some embodiments, each SVG link module 12 is correspondingly provided with an SVG running state monitoring unit 5, each SVG running state monitoring unit 5 is connected with the control unit 4 on the upper layer, the control unit 4 issues a control signal to each SVG running state monitoring unit to control the operation of the corresponding bypass switch, the power supply detection unit 2 can also be in one-to-one correspondence with each SVG link module 12, and the signal can be uploaded through the SVG running state monitoring unit 5.
Generally, a bypass switch is a device which has power failure retention and is not self-recoverable and must be opened manually; the SVG running state monitoring unit can detect a fault signal, but after the bypass switch short-circuits the H-bridge power unit, the control unit reformulates a new control scheme to drive other H-bridge power units which are not in fault, and the short-circuited H-bridge power unit is not in a normal running state even after maintenance, so that after maintenance access, whether the H-bridge power unit gets rid of the fault through maintenance or not can not be judged through detection of the SVG running state monitoring unit;
therefore, after maintenance and replacement, a worker can disconnect the bypass switch, the SVG chain link module after being connected to maintenance can be powered on and prepared, as shown in fig. 2, in the H-bridge power unit, an H-bridge structure is generally formed by a plurality of power switch tubes, and a bypass switch connected in parallel with the H-bridge power unit is connected to an alternating current input end of the H-bridge power unit, and meanwhile, a capacitor C is connected to a direct current end (DC +, DC-) and can be charged on a chain SVG branch when the bypass switch is disconnected, the power supply detection unit can be a conventional voltage division type voltage detection circuit or other voltage division type voltage detection circuits, and is not specifically limited here, and the power supply detection unit can detect the charging degree of the capacitor C, so as to judge whether the bypass switch in the H-bridge power unit is repaired and disconnected, and complete preparation.
In some embodiments, as shown in fig. 3, the bypass driving unit 6 includes an energy storage component 61, a charging switch 62 and a driving component 63, the H-bridge power unit 121 charges the energy storage component 61 through the charging switch 62, the energy storage component 61 supplies power to the driving component 63, the SVG operating state monitoring unit 5 is connected with the driving component 63 to control the driving component 63 to drive the bypass switch 122 to be switched on and off, and the bypass switch 122 is opposite to the on-off state of the charging switch 62.
Wherein, energy storage part 61 can adopt parts such as energy storage capacitor, drive part 63 can adopt the structure of the solenoid and the controllable switch of series connection each other, solenoid can actuation bypass switch, energy storage part 61 is the solenoid and the controllable switch power supply of series connection, under normal operating, controllable switch is in the off-state, solenoid does not have the circular telegram, bypass switch is in normally open state, and the switch that charges is in normally closed state, H bridge power unit's direct current end can charge for energy storage part through the switch that charges, when breaking down, SVG running state monitoring unit 5 control controllable switch is closed, solenoid is closed by the electrical control bypass switch, in addition, SVG running state monitoring unit 5 can the disconnection of simultaneous control charge switch, perhaps by the disconnection of solenoid interlock drive charge switch, provide stable power for solenoid.
In some embodiments, a power detecting unit 7 is further included, the power detecting unit 7 is electrically connected to the energy storage component 61 to detect the remaining power of the energy storage component 61, and the power detecting unit 7 is electrically connected to the control unit 4, wherein the power detecting unit 7 may be a voltage division detecting circuit, a coulometer detecting circuit, or the like.
In some embodiments, the bypass voltage detection unit 8 is further included for detecting a voltage condition across the bypass switch, the bypass voltage detection unit 8 is electrically connected to the control unit 4, and the bypass voltage detection unit 8 may adopt a voltage division detection circuit or the like.
The specific embodiment of the invention also discloses a control method of the bypass control system of the chain type SVG chain link module disclosed by any one of the embodiments, as shown in FIG. 4, the method comprises the following steps:
a1, the control unit reads the on-off condition of the bypass switch of each SVG chain link module in the storage unit;
a2, the power supply detection unit outputs the power-on condition of the H-bridge power unit to the control unit, and the control unit changes the on-off condition of the bypass switch of each SVG chain link module according to the power-on condition of each H-bridge power unit;
and A3, the control unit outputs signals according to the updated on-off condition of the bypass switch of each SVG chain link module to control the operation of the H-bridge power unit in the corresponding SVG chain link module.
According to the invention, when the maintenance or replacement of the SVG link module is completed, the power supply of the SVG link module is prepared in the chain type SVG branch, the control unit changes the on-off condition of the bypass switch of each SVG link module according to the power-on condition of each H bridge power unit, the control unit calculates the phase shift angle and the module voltage setting according to the recording content of the storage unit and controls each non-short-circuited H bridge power unit to operate, the design improves the working efficiency of workers, is convenient to operate, and works after accurately knowing the preparation condition of the SVG link module, so that the operation reliability of the system is improved;
the specific embodiment of the invention also discloses a control method of the bypass control system of the chain type SVG chain link module disclosed by any one of the embodiments, as shown in FIG. 5, the method comprises the following steps:
b1, the SVG operation state monitoring unit detects the operation state of the SVG link module;
b2, when the SVG running state monitoring unit detects that the running state of the SVG link module has a fault, the SVG running state monitoring unit uploads a fault signal to the control unit;
b3, the control unit controls each H bridge power unit to reset, records the reset times and returns to B1;
in B2, when the SVG running state monitoring unit detects that the running state of the SVG chain link module has a fault, the number of resetting times is judged, if the number of resetting times does not exceed a preset resetting threshold value, the operation enters B3, and if the number of resetting times exceeds the preset resetting threshold value, the operation enters B4;
and B4, the control unit sends an instruction to the SVG running state monitoring unit to control the closing of a bypass switch of the failed SVG link module.
When the SVG operation state monitoring unit detects that the SVG chain link module has a fault, the control unit controls each H-bridge power unit to reset and operate, restarts the operation after pausing for a certain time, and circulates for several times to prevent fault false alarm triggered occasionally, the pausing time can be set according to the actual situation, generally in millisecond level, such as 1ms-3ms, and the circulating frequency can be 2 times or 3 times, which is not limited here.
When the fault still exists after the circulation is carried out for a certain number of times, the control unit controls the bypass switch of the SVG chain link module with the fault to be closed again, and after the fault module bypasses, the SVG equipment normally operates. When later stage SVG equipment is out of line and is maintained, the staff maintains the change to relevant SVG chain link module again. The self-checking of this design through the system is eliminated the trouble reason in advance, confirms SVG chain link module trouble back, and the relevant SVG chain link module of timely automatic short circuit, equipment normal operating reduces equipment failure rate, improves system reliability.
The specific embodiment of the invention also discloses a control method of the bypass control system of the chain type SVG chain link module, which is disclosed by any one of the embodiments, and as shown in FIG. 6, the control method comprises the following steps:
c1, detecting the residual capacity of the energy storage component by the capacity detection unit;
c2, when the residual electric quantity of the energy storage component is lower than a low electric quantity limit value, and the SVG operation state monitoring unit detects that the operation state of the SVG chain link module has a fault;
and C3, the control unit controls the H bridge power unit of each SVG chain link module to suspend operation.
The method also comprises the following steps between the step C1 and the step C2:
D. when the residual electric quantity of the energy storage component is lower than the low electric quantity warning value, the control unit sends out a prompt warning.
The low power limit value and the low power warning value may be set according to actual conditions, for example, the low power limit value is 10% -20% of the total power, and the low power warning value is 20% -40% of the total power.
In the invention, the electric quantity detection unit is required to detect the residual electric quantity of the energy storage component all the time, the electric quantity of the energy storage component is ensured to be enough to supply power for the bypass driving unit, the bypass switch can be triggered to be closed, when the electric quantity is lower, an alarm is given, or under the condition of completely insufficient electric quantity, because whether the SVG chain link module breaks down or not can not be known, the bypass short circuit does not exist, in order to prevent the whole system from being broken down due to unpredictable influence of the broken SVG chain link module, the control module controls the H-bridge power unit of each SVG chain link module to pause to operate in time, the reliability and the safety of the system are improved, and meanwhile, each element can also be protected.
The specific embodiment of the invention also discloses a control method of the bypass control system of the chain type SVG chain link module, which comprises the following steps:
E. when the control unit controls the bypass switch of the failed SVG chain link module to be closed, the bypass voltage detection unit detects the voltage conditions at two ends of the bypass switch, and when the voltage at two ends of the bypass switch is greater than the closed voltage threshold value of the bypass switch, the control unit controls the H-bridge power unit of each SVG chain link module to pause.
In the invention, the voltage detection unit detects the voltage conditions at two ends of the bypass switch, when the control unit outputs a signal to control the bypass switch of the failed SVG link module to be closed and the voltage value detected by the voltage detection unit is at a higher level, the bypass switch is proved not to respond to the signal output by the control unit, and the control unit controls the H-bridge power unit of each SVG link module to pause in time, thereby improving the reliability and safety of the system and protecting each element.
The control methods of the above embodiments may be freely combined, for example, a control method preferred by the present design may include the steps of:
the control unit reads the on-off condition of the bypass switch of each SVG link module in the storage unit;
the power supply detection unit outputs the power-on condition of the H-bridge power unit to the control unit, and the control unit changes the on-off condition of a bypass switch of each SVG link module according to the power-on condition of each H-bridge power unit, wherein in the step, after the maintained SVG link module is connected to a power grid, the charging preparation is carried out, whether the voltage is greater than a set threshold value is judged, when the voltage is greater than the set threshold value, the preparation is finished, but the state in the storage unit of the EEROM is not modified, the SVG link module is still indicated to be in a short-circuit state, the control unit clears the state of the SVG link module in the EEROM (namely, the state is restored to a normal state), and the parameters such as a link phase shift angle, a module given voltage and the like are recalculated; when the preparation for non-charging is finished, indicating the SVG link module to be in a short circuit state in the EEROM, and keeping the state of the SVG link module unchanged;
the control unit outputs signals according to the updated on-off condition of the bypass switches of the SVG link modules to control the H-bridge power units in the corresponding SVG link modules to operate;
the electric quantity detection unit detects the residual electric quantity of the energy storage component, and when the residual electric quantity of the energy storage component is lower than a low electric quantity warning value, the control unit sends out an under-voltage warning;
the SVG running state monitoring unit detects the running state of the SVG link module;
when the SVG running state monitoring unit detects that the running state of the SVG link module has a fault, the SVG running state monitoring unit uploads a fault signal to the control unit;
the control unit controls each H-bridge power unit to reset and run, and records the resetting times;
whether the fault is eliminated after the SVG running state monitoring unit is reset or not is judged, and if the fault is eliminated, the fault is still not eliminated;
the electric quantity detection unit detects the residual electric quantity of the energy storage component;
when the residual electric quantity of the energy storage component is lower than the low electric quantity limit value, the SVG operation state monitoring unit detects that the operation state of the SVG chain link module breaks down;
the control unit controls the H bridge power unit of each SVG chain link module to pause;
if the electric quantity detection is finished, the electric quantity of the energy storage component is enough to drive a bypass to be closed, the control unit sends an instruction to the SVG operation state monitoring unit to control the bypass switch of the failed SVG link module to be closed (meanwhile, the control unit can also calculate the number of the residual non-short-circuited SVG link modules which can meet the set requirement for supporting the continuous operation of the three-phase SVG device, and if the number of the residual non-short-circuited SVG link modules does not meet the requirement, the whole device is stopped);
after the bypass switch is closed, the bypass state is transmitted back to the control unit, after the control unit confirms that the bypass is successful, parameters such as a phase shift angle and a given direct-current side voltage are calculated according to the number of the existing SVG chain link modules, the three-phase SVG device is controlled to operate, and the on-off condition of the bypass switch in the EEROM is updated;
the control unit controls the bypass switch of the SVG chain link module with a fault to be closed, the bypass voltage detection unit detects the voltage conditions at two ends of the bypass switch, and when the voltage at two ends of the bypass switch is greater than the closed voltage threshold value of the bypass switch, the control unit controls the H bridge power unit of each SVG chain link module to pause.
It is readily understood by those skilled in the art that the above-described preferred modes can be freely combined and superimposed without conflict.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (7)

1. The utility model provides a chain SVG chain link module bypass control system which characterized in that includes:
the three-phase SVG device comprises three chain type SVG branches which are mutually connected, wherein the chain type SVG branches comprise a plurality of SVG chain link modules which are connected end to end, and each SVG chain link module comprises an H bridge power unit and a bypass switch which is connected with the H bridge power unit in parallel;
the power supply detection unit is used for detecting the power-on condition of the H-bridge power unit;
the storage unit records the on-off condition of the bypass switch of each SVG link module;
the control unit is electrically connected with the storage unit, the power supply detection unit and the H-bridge power unit of each SVG link module respectively so as to control the three-phase SVG device to operate;
the system comprises an SVG running state monitoring unit and a bypass driving unit, wherein the SVG running state monitoring unit is used for detecting the running state of an SVG chain link module, the bypass driving unit is used for driving the on-off of a bypass switch, an H bridge power unit supplies power for the bypass driving unit, and the SVG running state monitoring unit is respectively electrically connected with a control unit and the bypass driving unit;
the control method of the bypass control system of the chain type SVG chain link module comprises the following steps:
b1, the SVG operation state monitoring unit detects the operation state of the SVG link module;
b2, when the SVG running state monitoring unit detects that the running state of the SVG link module has a fault, the SVG running state monitoring unit uploads a fault signal to the control unit;
b3, the control unit controls each H bridge power unit to reset, records the reset times and returns to B1;
in B2, when the SVG running state monitoring unit detects that the running state of the SVG chain link module has a fault, the number of resetting times is judged, if the number of resetting times does not exceed a preset resetting threshold value, the operation enters B3, and if the number of resetting times exceeds the preset resetting threshold value, the operation enters B4;
and B4, the control unit sends an instruction to the SVG running state monitoring unit to control the closing of a bypass switch of the failed SVG link module.
2. The chained SVG link module bypass control system of claim 1, wherein: bypass drive unit includes energy storage component, charging switch and driver part, H bridge power unit passes through the switch that charges does the energy storage component charges, the energy storage component does the driver part power supply, SVG running state monitoring unit with driver part connects with control the driver part drive the bypass switch break-make, and bypass switch with the break-make state of charging switch is opposite.
3. The chained SVG link module bypass control system of claim 2, wherein: the energy storage component is electrically connected with the control unit, and the electric quantity detection unit is electrically connected with the control unit.
4. The chained SVG link module bypass control system of claim 1, wherein: the bypass switch further comprises a bypass voltage detection unit for detecting the voltage conditions at two ends of the bypass switch, and the bypass voltage detection unit is electrically connected with the control unit.
5. A control method of the chained SVG link module bypass control system according to claim 3, comprising the steps of:
c1, detecting the residual capacity of the energy storage component by the capacity detection unit;
c2, when the residual electric quantity of the energy storage component is lower than a low electric quantity limit value, and the SVG operation state monitoring unit detects that the operation state of the SVG chain link module has a fault;
and C3, the control unit controls the H bridge power unit of each SVG chain link module to suspend operation.
6. The control method according to claim 5, further comprising, after the step C1, the steps of:
D. when the residual electric quantity of the energy storage component is lower than the low electric quantity warning value, the control unit sends out a prompt warning.
7. A control method of the chained SVG link module bypass control system claimed in claim 4, comprising the steps of:
E. when the control unit controls the bypass switch of the failed SVG chain link module to be closed, the bypass voltage detection unit detects the voltage conditions at two ends of the bypass switch, and when the voltage at two ends of the bypass switch is greater than the closed voltage threshold value of the bypass switch, the control unit controls the H-bridge power unit of each SVG chain link module to pause.
CN201911135258.1A 2019-11-19 2019-11-19 Chained SVG chain link module bypass control system and control method thereof Active CN110994633B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911135258.1A CN110994633B (en) 2019-11-19 2019-11-19 Chained SVG chain link module bypass control system and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911135258.1A CN110994633B (en) 2019-11-19 2019-11-19 Chained SVG chain link module bypass control system and control method thereof

Publications (2)

Publication Number Publication Date
CN110994633A CN110994633A (en) 2020-04-10
CN110994633B true CN110994633B (en) 2021-09-03

Family

ID=70084948

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911135258.1A Active CN110994633B (en) 2019-11-19 2019-11-19 Chained SVG chain link module bypass control system and control method thereof

Country Status (1)

Country Link
CN (1) CN110994633B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111934570B (en) * 2020-09-29 2021-01-19 国网（天津）综合能源服务有限公司 Fault tolerance control method for cascaded H-bridge type optical storage hybrid energy router
CN112531708A (en) * 2020-12-25 2021-03-19 山东泰开电力电子有限公司 Bypass system for improving reliability of SVG
CN114243722A (en) * 2021-11-29 2022-03-25 深圳市禾望电气股份有限公司 Two-in-one SVG power module and bypass control method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102638048A (en) * 2012-03-29 2012-08-15 威凡智能电气高科技有限公司 Automatic bypass processing method of H-bridge cascaded chain type static synchronous compensator (STATCOM)
CN102638157A (en) * 2012-05-02 2012-08-15 株洲南车时代电气股份有限公司 Unit H-bridge module bypass circuit of chain type static synchronous compensator (STATCOM)
CN103036238A (en) * 2012-12-24 2013-04-10 珠海万力达电气股份有限公司 Control structure and method of chain-type active power filter (FAPF) linkage unit bypass
CN107546726A (en) * 2017-09-20 2018-01-05 湖南省湘电试研技术有限公司 Intensive DC de-icing device SVG power models bypass structure and its control method
CN109378831A (en) * 2018-12-25 2019-02-22 思源清能电气电子有限公司 A kind of control device and control method for SVG equipment by-pass switch
CN109728586A (en) * 2018-11-08 2019-05-07 西安西电电力系统有限公司 The redundant fault-tolerant control method and device of chain type triangular form STATCOM

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5568055B2 (en) * 2011-05-17 2014-08-06 トヨタ自動車株式会社 Power supply
CN103916041B (en) * 2014-03-18 2016-06-01 上海交通大学 Cascade energy accumulation current converter many chain links redundancy control method
CN105680412B (en) * 2016-03-04 2018-03-20 常州东方铁路器材有限公司 A kind of intelligent self-recovery overcurrent protector and its method of work

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102638048A (en) * 2012-03-29 2012-08-15 威凡智能电气高科技有限公司 Automatic bypass processing method of H-bridge cascaded chain type static synchronous compensator (STATCOM)
CN102638157A (en) * 2012-05-02 2012-08-15 株洲南车时代电气股份有限公司 Unit H-bridge module bypass circuit of chain type static synchronous compensator (STATCOM)
CN103036238A (en) * 2012-12-24 2013-04-10 珠海万力达电气股份有限公司 Control structure and method of chain-type active power filter (FAPF) linkage unit bypass
CN107546726A (en) * 2017-09-20 2018-01-05 湖南省湘电试研技术有限公司 Intensive DC de-icing device SVG power models bypass structure and its control method
CN109728586A (en) * 2018-11-08 2019-05-07 西安西电电力系统有限公司 The redundant fault-tolerant control method and device of chain type triangular form STATCOM
CN109378831A (en) * 2018-12-25 2019-02-22 思源清能电气电子有限公司 A kind of control device and control method for SVG equipment by-pass switch

Also Published As

Publication number Publication date
CN110994633A (en) 2020-04-10

Similar Documents

Publication Publication Date Title
CN108683202B (en) Energy storage system
CN110994633B (en) Chained SVG chain link module bypass control system and control method thereof
CN111049245B (en) High-reliability direct-current power supply for transformer substation and detection method
CN102664454B (en) Non-floating charging type substation direct current power supply system based on iron lithium battery
CN106026157A (en) Failure prediction method and device of flexible direct-current transmission convertor valve sub-module
CN111525642B (en) Low-voltage parallel battery management system and method
US10958086B2 (en) Battery system
CN112130063B (en) Detection and protection method for mechanical switch theft jump of hybrid high-voltage direct-current breaker
CN211183525U (en) AC/DC integrated UPS
CN211556956U (en) High-reliability direct-current power supply for transformer substation
CN110932357A (en) Energy storage device
CN103151790A (en) Intelligent power supply system of peak moving and valley filling
CN113514762B (en) APF/SVG relay state detection system
CN104882936A (en) Communication energy storage power supply system
CN102435933B (en) Automobile circuit fault discrimination method
CN116404679A (en) Micro-grid compensation device and micro-grid compensation method
CN105006884A (en) Intrinsically-safe direct current system
CN202550664U (en) Direct current power supply system of non-floating charge type transformer substation based on lithium iron battery
CN212304789U (en) Energy storage battery double protection structure for energy storage system
CN204761067U (en) Communication energy storage power supply system
CN207134865U (en) A kind of low-voltage direct-current system
CN115528688B (en) Energy storage battery unit fault bypass control method and device and electronic equipment
CN113437791B (en) Photovoltaic energy storage system and control method thereof
CN115954991B (en) Online contravariant charge-discharge device of storage battery
CN116247771B (en) Inverter activated lithium battery device with protection function and control method thereof

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
GR01 Patent grant
GR01 Patent grant