CN112103919B - Three-layer relay protection system, device and method for hybrid distribution transformer - Google Patents
Three-layer relay protection system, device and method for hybrid distribution transformer Download PDFInfo
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- CN112103919B CN112103919B CN202010954652.4A CN202010954652A CN112103919B CN 112103919 B CN112103919 B CN 112103919B CN 202010954652 A CN202010954652 A CN 202010954652A CN 112103919 B CN112103919 B CN 112103919B
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- 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
- H02H7/04—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 transformers
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- 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
- H02H7/20—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 electronic equipment
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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
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Abstract
The invention discloses a three-layer relay protection system, a device and a method of a hybrid distribution transformer, wherein a primary side winding of a main transformer of the device is connected with a power grid through a primary side switch group, and a secondary side winding of the main transformer is connected with a load through a secondary side switch group; a tertiary side winding of the main transformer is connected with the current compensator through a tertiary side switch group; the primary side winding of the main transformer is connected with the primary side winding of the isolation transformer in series, and the secondary side winding of the main transformer is connected with the voltage compensator through the secondary side switch group; the voltage compensator and the current compensator are connected through a direct current bus.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of transformers, and relates to a three-layer relay protection system, a three-layer relay protection device and a three-layer relay protection method for a hybrid distribution transformer.
[ background of the invention ]
In a future smart grid, as the utilization rate of distributed new energy power generation and power electronic conversion technology is continuously improved, the uncertainty of intermittent new energy power generation, the uncertainty of equipment and network operation states and the uncertainty of load and demand side response cause huge challenges in the aspects of voltage stability, power supply reliability, power quality and the like of a power distribution network. The hybrid distribution transformer can replace the traditional distribution transformer to realize the functions of reactive power compensation, harmonic suppression, voltage regulation and the like, and is suitable for being widely applied to the future intelligent distribution network.
The main body of the hybrid distribution transformer is still the traditional distribution transformer, and the functions of voltage grade transformation, voltage and current compensation, electric energy quality control and the like of the power distribution network are realized by adding a voltage compensator and a current compensator on the basis of the traditional distribution transformer. However, with the addition of a large number of power electronic devices, because the probability of failure of the power electronic devices is much higher than that of the conventional distribution transformer, if the existing relay protection device and strategy for the conventional distribution transformer are still adopted, once a certain power electronic device fails, the whole transformer system can be immediately paralyzed, the whole hybrid distribution transformer must be cut off from the system, the service life of the hybrid distribution transformer can be reduced to even several weeks to several months, and the reliability and stability of the hybrid distribution transformer are greatly reduced.
Through retrieval, many documents related to relay protection of transformers are loaded at present, but most of the documents are relay protection strategies of traditional distribution transformers, and related technical schemes specially aiming at relay protection of hybrid distribution transformers are not available.
[ summary of the invention ]
The present invention is directed to overcome the above drawbacks of the prior art, and provides a three-layer relay protection system, apparatus and method for a hybrid distribution transformer, so as to solve the problem that a technical solution for relay protection of a hybrid distribution transformer is lacking in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a three-layer relay protection device for a hybrid distribution transformer, comprising: the transformer comprises a main transformer, an isolation transformer, a current compensator and a voltage compensator;
a primary side winding of the main transformer is connected with a power grid through a primary side switch group, and a secondary side winding of the main transformer is connected with a load through a secondary side switch group; a tertiary side winding of the main transformer is connected with the current compensator through a tertiary side switch group;
the primary side winding of the main transformer is connected with the primary side winding of the isolation transformer in series, and the secondary side winding of the main transformer is connected with the voltage compensator through the secondary side switch group; the voltage compensator and the current compensator are connected through a direct current bus.
The invention is further improved in that:
preferably, the primary side switch group, the secondary side switch group, the tertiary side switch group and the quaternary side switch group are all bidirectional thyristors.
Preferably, the current compensator and the voltage compensator are both three-phase voltage source type inverters.
A three-layer relay protection system of a hybrid distribution transformer comprises a judgment module and an execution module;
the judging module is used for judging the failed equipment and transmitting the equipment to the executing module;
and the execution module is used for executing corresponding relay protection actions according to the equipment with the fault.
Preferably, the equipment is a main transformer, an isolation transformer, a current compensator and a voltage compensator.
Preferably, the relay protection actions include a first layer relay protection action, a second layer relay protection action and a third layer relay protection action; the first layer of relay protection action is used for cutting off the isolation transformer and the voltage compensator from the hybrid distribution transformer, the second layer of relay protection action is used for cutting off the isolation transformer, the voltage compensator and the current compensator from the hybrid distribution transformer, and the third layer of relay protection action is used for cutting off the hybrid distribution transformer from the power distribution network.
A three-layer relay protection method of the device is characterized in that corresponding relay protection actions are executed to protect a hybrid distribution transformer by judging specific fault equipment; the first layer of relay protection action cuts the isolation transformer and the voltage compensator from the hybrid distribution transformer, the second layer of relay protection action cuts the isolation transformer, the voltage compensator and the current compensator from the hybrid distribution transformer, and the third layer of relay protection action cuts the hybrid distribution transformer from the power distribution network.
Preferably, the step of judging the specific fault equipment is as follows:
a main transformer judgment step, namely judging whether the main transformer fails, if so, executing a third layer of relay protection action to finish the whole judgment process, otherwise, executing a current compensator judgment step;
a current compensator judging step of judging whether the current compensator has a fault, if so, executing a second layer of relay protection action, and repeating the main transformer judging step; otherwise, executing the judgment step of the voltage compensator;
a voltage compensator judging step, namely judging whether the voltage compensator has a fault or not, and repeatedly executing the main transformer judging step after executing the first layer of relay protection action; otherwise, directly and repeatedly executing the main transformer judging step.
Preferably, the step of the first layer of relay protection action is:
(1) the voltage compensator reduces the output voltage amplitude to 10% of the set output amplitude;
(2) applying a driving signal to the five-time side switch group;
(3) cutting off a driving signal of the secondary side switch group;
(4) waiting for a power frequency period of 0.02 s;
(5) the drive signal of the voltage compensator is cut off.
Preferably, the step of the second layer relay protection action is:
(1) the voltage compensator reduces the output voltage amplitude to 10% of the set output amplitude;
(2) applying a driving signal to the five-time side switch group;
(3) cutting off a driving signal of the secondary side switch group;
(4) waiting for a power frequency period of 0.02 s;
(5) cutting off a driving signal of the voltage compensator;
(6) cutting off a driving signal of the current compensator;
(7) and cutting off the driving signal of the tertiary side switch group.
Preferably, the third layer of relay protection action includes:
(1) the voltage compensator reduces the output voltage amplitude to 10% of the set output amplitude;
(2) cutting off a driving signal of the current compensator;
(3) cutting off the driving signals of the secondary side switch group and the tertiary side switch group;
(4) waiting for a power frequency period of 0.02 s;
(5) cutting off a driving signal of the secondary side switch group;
(6) applying a driving signal to the five-time side switch group;
(7) wait for a power frequency period of 0.02s
(8) The drive signal of the voltage compensator is cut off.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a three-layer relay protection device of a hybrid distribution transformer, wherein a primary side winding of a main transformer of the device is connected with a power grid through a primary side switch group, and a secondary side winding of the main transformer is connected with a load through a secondary side switch group; a tertiary side winding of the main transformer is connected with the current compensator through a tertiary side switch group; the primary side winding of the main transformer is connected with the primary side winding of the isolation transformer in series, and the secondary side winding of the main transformer is connected with the voltage compensator through the secondary side switch group; the voltage compensator and the current compensator are connected through a direct current bus. The invention utilizes the special topological structure of the hybrid distribution transformer, separates each functional module of the hybrid distribution transformer through five bidirectional thyristor switches, can timely cut off a corresponding device with problems when power electronic faults occur, timely cuts off the parts with problems, can ensure that the rest functional modules can still normally work, can increase the service life of the hybrid distribution transformer from weeks to months to years which are the same as that of the traditional distribution transformer, and greatly increases the service life and the reliability of the hybrid distribution transformer.
The invention also discloses a three-layer relay protection system of the hybrid distribution transformer, which comprises a judgment module and an execution module, wherein the two modules firstly judge the equipment with faults and execute corresponding protection strategies aiming at the corresponding equipment, so that when a certain equipment has faults, the influence on the whole device is reduced to the maximum extent, and if the main equipment is changed, the whole hybrid distribution transformer is directly cut off from the system, so that the influence on the whole power grid is prevented, and the larger problem is caused.
The invention also discloses a three-layer relay protection method of the hybrid distribution transformer, which is used for executing corresponding relay protection operation after judging that equipment has a fault.
[ description of the drawings ]
Fig. 1 is a general schematic diagram of relay protection of a hybrid distribution transformer according to the present invention.
Fig. 2 is a structural diagram of a triac switch according to the present invention.
Fig. 3 is a flow chart of relay protection diagnosis for a hybrid distribution transformer according to the present invention.
Fig. 4 is a flowchart of the first layer relay protection operation of the hybrid distribution transformer according to the present invention.
Fig. 5 is a flow chart of the second layer relay protection operation of the hybrid distribution transformer according to the present invention.
Fig. 6 is a flow chart of the third layer relay protection operation of the hybrid distribution transformer according to the present invention.
In fig. 1: t is1-a three-phase three-winding main transformer, T2-a three-phase isolation transformer, S1Primary side grid-connected switch bank, S2-secondary side load switch bank, S3-a tertiary side current compensator switch block, S4Fourth-order side voltage compensator switch blocks, S5Isolation transformer switch banks, CVp-a current compensator, CVt-a voltage compensator.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention discloses a three-layer relay protection system, a three-layer relay protection device and a three-layer relay protection method for a hybrid distribution transformer.
Specifically, the hybrid distribution transformer of the system comprises a three-phase three-winding main transformer T1Three-phase isolation transformer T2Three-phase current compensator CVpThree-phase voltage compensator CVtPrimary side switch set S1(S1a,S1b,S1c) Secondary side switch set S2(S2a,S2b,S2c) Third order side switch group S3(S3a,S3b,S3c) Four-time side switch group S4(S4a,S4b,S4c) Quintic side switch group S5(S5a,S5b,S5c) The five-side switch group is used for bypassing the five-side winding of the isolation transformer.
Three-phase three-winding main transformer T1The primary side is connected with the input voltage of the power grid, the secondary side is a load side with a three-phase four-wire system, the third winding is a control winding, the control winding and a current compensator CVpConnection, current compensator CVpThe current compensation function is completed by the magnetic potential balance principle. Three-phase isolation transformer T2The secondary side winding is the fourth-order side winding of the hybrid distribution transformer and the voltage compensator CVtAnd (4) connecting. Three-phase isolation transformer T2The primary winding of the transformer is a five-time side winding of the hybrid distribution transformer and is connected with the primary winding of a three-phase three-winding main transformer T1 in series. Current compensator CVpAnd a voltage compensator CVtConnected in a back-to-back manner with a DC bus CVpAnd CVtProviding a bus voltage.
Because the bidirectional thyristor has higher voltage-resistant grade, better large current-resistant capability and lower cost, all the switching switch devices are the bidirectional thyristors, the structure of which is shown in figure 2, the bidirectional thyristor is used as an alternating current switch, a signal applying a driving signal can be conducted, and the driving signal is cut off and the current is only zero-crossed when the bidirectional thyristor is turned offAnd (6) turning off. Five-group switch set S1,S2,S3S4 and S5And the access and the cut-off of five windings of the hybrid distribution transformer are respectively controlled by controlling a driving signal applied by the bidirectional thyristor.
Current compensator CVpAnd a voltage compensator CVtThe three-phase voltage source type inverter consists of IGBTs, and controls the connection and disconnection of the current compensator and the voltage compensator respectively by controlling modulation signals of the IGBTs, and has the current compensation and voltage compensation functions under normal work.
Based on the hybrid distribution transformer, a three-layer relay protection strategy of the hybrid distribution transformer comprises: a first layer of relay protection strategy: only the voltage compensator and the isolation transformer are cut off; and a second layer of relay protection strategy: only the voltage compensator, the isolation transformer and the current compensator are cut off; and a third layer of relay protection strategy: and cutting the hybrid distribution transformer from the distribution network in a whole.
The method comprises the following specific steps:
(1) and in the relay protection diagnosis stage of the hybrid distribution transformer, which part of the hybrid distribution transformer has a fault is judged according to voltage and current signals transmitted by the sensors, the voltage sensors are respectively connected to two ends of the first side, the second side, the third side, the fourth side and the fifth side in parallel, and the current sensors are respectively connected to loops of the first side, the second side, the third side, the fourth side and the fifth side in series. In the presence of only the voltage compensator CVtWhen a fault occurs, executing a first layer of relay protection action; in the presence of only the voltage compensator CVtAnd a current compensator CVpWhen a fault occurs, executing a second layer of relay protection action; in the main transformer T1When a fault occurs, a third layer of relay protection action is executed, referring to fig. 3, and the specific judgment flow is as follows:
(1.1) judging the main transformer T1If the fault occurs, directly executing the third layer of relay protection action if the fault occurs, otherwise, if the main transformer T occurs1And if no fault occurs, the next judgment is carried out.
(1.2) judgment Current compensator CVpWhether or not a fault has occurred, and if soBarrier, performing second layer relay protection action, otherwise if the current compensator CVpAnd if no fault occurs, the next judgment is carried out.
(1.3) judgment Voltage compensator CVtIf a fault occurs, executing a first layer of relay protection action if the fault occurs, otherwise, executing a second layer of relay protection action if the voltage compensator C does not generate the faultVtAnd (4) if no fault occurs, returning to the step (1) for judgment again.
(2) First layer relay protection action, as current compensator C in hybrid distribution transformerVpAnd a main transformer T1No fault, only voltage compensator CVtWhen a fault occurs, the four-time side switch group S is controlled4And a five-side switch group S5The isolating transformer and the voltage compensator are driven by the driving signal of the thyristor, and the isolating transformer and the voltage compensator are driven by the hybrid distribution transformer CVtTherefore, after the first layer of relay protection action is executed, the hybrid distribution transformer can still complete the functions of current compensation and distribution network voltage grade transformation.
(3) Second layer relay protection action, as main transformer T in hybrid distribution transformer1No fault, only voltage compensator and current compensator CVpWhen a fault occurs, the isolation transformer and the voltage compensator C are driven by the driving signals of the thyristors of the control switch groups 3, 4 and 5VtAnd a current compensator CVpThe hybrid distribution transformer is cut off from the hybrid distribution transformer, so that the hybrid distribution transformer can still complete the function of the distribution network voltage grade transformation of the traditional distribution transformer after the second-layer relay protection action is executed.
(4) The third layer of relay protection action, as the main transformer T in the hybrid distribution transformer1When a fault occurs, the primary side switch group S is controlled1(S1a,S1b,S1c) Secondary side switch group S2(S2a,S2b,S2c) And a third side switch group S3(S3a,S3b,S3c) And a fourth side switch group S4(S4a,S4b,S4c) And a five-side switch group S5(S5a,S5b,S5c) The driving signal of the thyristor cuts off the whole hybrid distribution transformer from the distribution network, thereby avoiding greater harm.
Referring to fig. 4, the specific steps of the first layer of relay protection action in the above process are as follows:
(1) voltage compensator CVtThe output voltage amplitude is reduced to 10% of the original output amplitude, and the situation that five times of side windings generate short-circuit large current is avoided.
(2) Five-time side switch set S for bidirectional thyristor5The drive signal is applied bypassing the five-time side winding.
(3) Switch set S for cutting off quadric side of bidirectional thyristor4The four-time side winding is cut off by the driving signal of (1).
(4) Waiting for a power frequency period of 0.02S to ensure that the zero crossing point of current occurs and the fourth-side switch group S4And (5) disconnecting.
(5) Cut-off voltage compensator CVtThe drive signal of (1).
Referring to fig. 5, the specific steps of the second layer relay protection action in the above process are as follows:
(1) voltage compensator CVtThe output voltage amplitude is reduced to 10% of the original output amplitude, and the situation that the side winding is short-circuited and large current occurs five times is avoided.
(2) Five-time side switch set S for bidirectional thyristor5The drive signal is applied bypassing the five-time side winding.
(3) Switch set S for cutting off quadric side of bidirectional thyristor4The four-time side winding is cut off by the driving signal of (1).
(4) Waiting for a power frequency period of 0.02S to ensure that the zero crossing point of current occurs and the fourth-side switch group S4And (5) disconnecting.
(5) Cut-off voltage compensator CVtThe voltage compensator is removed from the hybrid distribution transformer.
(6) Cut-off current compensator CVpThe current compensator is removed from the hybrid distribution transformer.
(7) Cutting off the bidirectional thyristor three timesSide switch set S3The tertiary side winding is cut off by the drive signal of (1).
Referring to fig. 6, the specific steps of the third layer of relay protection operation in the above process are as follows:
(1) voltage compensator CVtThe output voltage amplitude is reduced to 10% of the original output amplitude, and the situation that five times of side windings generate short-circuit large current is avoided.
(2) Cut-off current compensator CVpThe current compensator is removed from the hybrid distribution transformer.
(3) Cut-off bidirectional thyristor secondary side switch group S2And a tertiary side switch group S3The secondary side and the tertiary side windings are cut off by the driving signal of (1).
(4) Waiting for a power frequency period of 0.02S to ensure that the zero crossing point of current occurs and the secondary side switch group S2And a tertiary side switch group S3And (5) disconnecting.
(5) Switch set S for cutting off quadric side of bidirectional thyristor4The four-time side winding is cut off by the driving signal of (1).
(6) Five-time side switch set S for bidirectional thyristor5The drive signal is applied bypassing the five-time side winding.
(7) Waiting for a power frequency period of 0.02S to ensure that the zero crossing point of current occurs and the fourth-side switch group S4And (5) disconnecting.
(8) Cut-off voltage compensator CVtThe voltage compensator is removed from the hybrid distribution transformer.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A three-layer relay protection system of a hybrid distribution transformer is characterized by comprising a judgment module and an execution module;
the judging module is used for judging the failed equipment and transmitting the equipment to the executing module;
the execution module is used for executing corresponding relay protection actions according to the equipment with the fault;
the equipment comprises a main transformer, an isolation transformer, a current compensator and a voltage compensator;
the relay protection actions comprise a first layer of relay protection actions, a second layer of relay protection actions and a third layer of relay protection actions; the first layer of relay protection action is used for cutting off the isolation transformer and the voltage compensator from the hybrid distribution transformer, the second layer of relay protection action is used for cutting off the isolation transformer, the voltage compensator and the current compensator from the hybrid distribution transformer, and the third layer of relay protection action is used for cutting off the hybrid distribution transformer from the power distribution network.
2. The three-layer relay protection system of the hybrid distribution transformer of claim 1,
a primary side winding of the main transformer is connected with a power grid through a primary side switch group, and a secondary side winding of the main transformer is connected with a load through a secondary side switch group; a tertiary side winding of the main transformer is connected with the current compensator through a tertiary side switch group;
the primary side winding of the main transformer is connected with the primary side winding of the isolation transformer in series, and the secondary side winding of the main transformer is connected with the voltage compensator through the secondary side switch group; the voltage compensator and the current compensator are connected through a direct current bus.
3. The three-layer relay protection system of a hybrid distribution transformer of claim 2, wherein the primary side switch set, the secondary side switch set, the tertiary side switch set and the quaternary side switch set are triacs.
4. The three-layer relay protection system of a hybrid distribution transformer of claim 1, wherein the current compensator and the voltage compensator are three-phase voltage source inverters.
5. The three-layer relay protection method of the hybrid distribution transformer applied to the system of claim 1 is characterized in that the hybrid distribution transformer is protected by judging specific fault equipment and executing corresponding relay protection action; the first layer of relay protection action cuts the isolation transformer and the voltage compensator from the hybrid distribution transformer, the second layer of relay protection action cuts the isolation transformer, the voltage compensator and the current compensator from the hybrid distribution transformer, and the third layer of relay protection action cuts the hybrid distribution transformer from the power distribution network.
6. The three-layer relay protection method of a hybrid distribution transformer of claim 5, wherein the step of determining the specific fault device is:
a main transformer judgment step, namely judging whether the main transformer fails, if so, executing a third layer of relay protection action to finish the whole judgment process, otherwise, executing a current compensator judgment step;
a current compensator judging step of judging whether the current compensator has a fault, if so, executing a second layer of relay protection action, and repeating the main transformer judging step; otherwise, executing the judgment step of the voltage compensator;
a voltage compensator judging step, namely judging whether the voltage compensator has a fault or not, and repeatedly executing the main transformer judging step after executing the first layer of relay protection action; otherwise, directly and repeatedly executing the main transformer judging step.
7. The three-layer relaying method of a hybrid distribution transformer as recited in claim 5, wherein said first layer relaying step comprises:
(1) the voltage compensator reduces the output voltage amplitude to 10% of the set output amplitude;
(2) applying a driving signal to the five-time side switch group;
(3) cutting off a driving signal of the secondary side switch group;
(4) waiting for a power frequency period of 0.02 s;
(5) the drive signal of the voltage compensator is cut off.
8. The three-layer relaying method of a hybrid distribution transformer as recited in claim 5, wherein said second layer relaying step comprises:
(1) the voltage compensator reduces the output voltage amplitude to 10% of the set output amplitude;
(2) applying a driving signal to the five-time side switch group;
(3) cutting off a driving signal of the secondary side switch group;
(4) waiting for a power frequency period of 0.02 s;
(5) cutting off a driving signal of the voltage compensator;
(6) cutting off a driving signal of the current compensator;
(7) and cutting off the driving signal of the tertiary side switch group.
9. The three-layer relaying method of a hybrid distribution transformer as recited in claim 5, wherein said third layer relaying step comprises:
(1) the voltage compensator reduces the output voltage amplitude to 10% of the set output amplitude;
(2) cutting off a driving signal of the current compensator;
(3) cutting off the driving signals of the secondary side switch group and the tertiary side switch group;
(4) waiting for a power frequency period of 0.02 s;
(5) cutting off a driving signal of the secondary side switch group;
(6) applying a driving signal to the five-time side switch group;
(7) wait for a power frequency period of 0.02s
(8) The drive signal of the voltage compensator is cut off.
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| EP3596743A4 (en) * | 2017-03-17 | 2020-09-09 | Georgia Tech Research Corporation | Hybrid transformer systems and methods |
| CN108808729B (en) * | 2018-06-07 | 2024-09-20 | 中国华电科工集团有限公司 | Circuit structure of electric main wiring of power plant |
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