CN107181262B - Dynamic voltage recovery device for cross power taking and working method thereof - Google Patents
Dynamic voltage recovery device for cross power taking and working method thereof Download PDFInfo
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- CN107181262B CN107181262B CN201710484623.4A CN201710484623A CN107181262B CN 107181262 B CN107181262 B CN 107181262B CN 201710484623 A CN201710484623 A CN 201710484623A CN 107181262 B CN107181262 B CN 107181262B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention relates to a dynamic voltage recovery device for cross power taking and a working method thereof, wherein the dynamic voltage recovery device comprises two sets of dynamic voltage recoverers with the same structure, the two sets of dynamic voltage recoverers are respectively arranged between a corresponding first section bus and a first wire inlet switch and between a corresponding second section bus and a corresponding second wire inlet switch, meanwhile, the input end of the first dynamic voltage recoverer is provided with an output end connected with the second wire inlet switch in a connecting way, and the input end of the second dynamic voltage recoverer is provided with an output end connected with the first wire inlet switch in a connecting way so as to realize cross power taking. The invention realizes the problem of voltage drop of the direct-current energy storage circuit of the converter unit in the dynamic voltage restorer when one section of power grid voltage drops by arranging the cross power-taking mode of the two sections of bus bars, and has the advantages of simple structure, easy realization, low cost and high reliability.
Description
Technical Field
The invention relates to an electric energy quality management device, in particular to a dynamic voltage recovery device for cross power taking and a working method thereof, which are applied to the field of electric energy quality management.
Background
Statistics show that among the dynamic power quality problems, voltage drop is the power quality problem with the highest occurrence frequency and the most serious influence, and the largest economic loss is caused. Dynamic Voltage Restorer (DVR) can compensate for the voltage drop of the system and is considered to be the most economical and effective power device for solving the voltage drop problem at present.
The current transformer is a core component in the dynamic voltage restorer, the input end of the current transformer is generally connected to a power grid, the output end of the current transformer is generally a voltage source type inverter, when the voltage of the power grid drops, in order to provide a stable direct current power supply for the output voltage source type inverter, a voltage stabilizing device needs to be arranged on the direct current side of the inverter, and the current of the voltage stabilizing device needs to consider the situation when the voltage of the power grid drops most, so that the maximum current of the voltage stabilizing device is far greater than the current when the voltage of the power grid operates at rated, and the device and the cost need to be considered according to the worst situation. The power of the current dynamic voltage restorer cannot be very large and can only be suitable for medium and small power due to the size and cost of the voltage stabilizing device.
Disclosure of Invention
The invention aims to overcome the application limitation of a dynamic voltage restorer in the prior art, discloses a dynamic voltage restorer for cross power taking and a working method thereof, adopts a design principle of power supply of a double-section bus, adopts a double-dynamic voltage restorer to realize cross power taking, is suitable for high-power and super-high-power DVRs, avoids the problem of voltage drop of a converter direct-current energy storage circuit in the dynamic voltage restorer, and ensures normal power supply to loads connected on the bus.
The invention is realized in the following way: a dynamic voltage recovery device for cross power taking is characterized in that: the dynamic voltage recovery device comprises two sets of dynamic voltage recoverers with the same structure, namely a first dynamic voltage recoverer and a second dynamic voltage recoverer, wherein the two sets of dynamic voltage recoverers are respectively arranged between a corresponding first section bus and a first incoming line switch and between a corresponding second section bus and a corresponding second incoming line switch, meanwhile, the input end of the first dynamic voltage recoverer is provided with an output end connected to the second incoming line switch through a connecting wire, and the input end of the second dynamic voltage recoverer is provided with an output end connected to the first incoming line switch through a connecting wire.
The dynamic voltage restorer comprises a converter unit, a filter inductance unit, a filter capacitance unit, a coupling transformer unit, a rapid bypass switch unit, a first maintenance switch, a second maintenance switch and a bypass maintenance switch, wherein the first section bus and the second section bus are connected through a bus connection switch. The converter unit comprises an output inverter circuit, a direct current energy storage circuit and an input rectifying circuit, wherein the input end of the converter unit is used as the input end of the dynamic voltage restorer, the converter unit is provided with two output ends, one end of the converter unit is connected with the input end of the filter inductance unit, the other end of the converter unit is connected with one end of the filter capacitance unit, the other end of the filter capacitance unit is connected with the output end of the filter inductance unit, the secondary side of the coupling transformer unit is connected with the filter capacitance unit in parallel, the bypass overhaul switch is connected between the inlet wire switch and a load in series, one end, close to the inlet wire switch, of the coupling transformer unit is connected with the inlet wire switch through the first overhaul switch after the primary side of the coupling transformer unit is connected with one end, close to the load, of the coupling transformer unit is connected with the load through the second overhaul switch after the primary side of the coupling transformer unit is connected with the fast bypass switch in parallel.
The working method of the cross power-taking dynamic voltage recovery device is characterized by comprising the following steps of: the dynamic voltage recovery device comprises two sets of dynamic voltage recoverers with the same structure, namely a first dynamic voltage recoverer and a second dynamic voltage recoverer, which are respectively arranged between a corresponding first section bus and a first incoming line switch and between a corresponding second section bus and a corresponding second incoming line switch, meanwhile, the input end of the first dynamic voltage recoverer is provided with an output end connected with the second incoming line switch by a connecting wire, the input end of the second dynamic voltage recoverer is provided with an output end connected with the first incoming line switch by a connecting wire, and the dynamic voltage recoverer comprises a converter unit, a filter inductance unit, a filter capacitance unit, a coupling transformer unit, a rapid bypass switch unit, a first maintenance switch, a second maintenance switch and a bypass maintenance switch, and the first section bus and the second section bus are connected by a bus-bar switch; when the voltages of the first section bus and the second section bus are normal, the bus-bar switch is opened, the first wire-inlet switch and the second wire-inlet switch are closed, the first dynamic voltage restorer and the second dynamic voltage restorer are used for cross power taking, and the bus-bar switch operates normally.
The converter units in the two sets of dynamic voltage recoverers can operate in a mode of being powered by the centralized shared direct current buses respectively, when the first section of buses are powered off and the second section of buses are normal, the bus-bar switch is closed, the first inlet wire switch is opened, the second inlet wire switch is closed, the first load and the second load are powered by the second section of buses, the output inverter circuit of the converter unit in the first dynamic voltage recoverer and the input rectifier circuit of the converter unit in the second dynamic voltage recoverer stop operating, the output inverter circuit of the second dynamic voltage recoverer and the input rectifier circuit of the first dynamic voltage recoverer operate normally, and the voltage compensation function of the second section of buses in single bus power supply is realized; when the second section bus is powered off and the first section bus is normal, the bus-bar switch is closed, the second inlet-line switch is opened, the first inlet-line switch is closed, the first load and the second load are powered by the first section bus, the output inverter circuit of the second dynamic voltage restorer and the input rectifying circuit of the first dynamic voltage restorer stop running, the output inverter circuit of the first dynamic voltage restorer and the input rectifying circuit of the second dynamic voltage restorer run normally, and the voltage compensation function when the single bus of the first section bus is powered is realized.
The two sets of dynamic voltage recoverers can be respectively provided with an output switch at the output end close to the corresponding bus and are connected through a change-over switch at the output end close to the corresponding incoming line switch, when the voltages of the first section bus and the second section bus are normal, the bus-bar switch is opened, the first incoming line switch and the second incoming line switch are closed, the change-over switch is opened, the first output switch and the second output switch are closed, and the first dynamic voltage recoverer and the second dynamic voltage recoverer are powered by crossing and operate normally; when the first section bus is powered off and the second section bus is normal, the bus-bar switch is closed, the first inlet wire switch is opened, the second inlet wire switch is closed, the first load and the second load are powered by the second section bus, the change-over switch and the first output switch are closed, the second output switch is opened, the second dynamic voltage restorer stops running, and the first dynamic voltage restorer operates normally, so that the voltage compensation function of the second section bus during single bus power supply is realized; when the second section bus loses electricity, the first section bus is normal, the bus-bar switch is closed, the second inlet wire switch is opened, the first inlet wire switch is closed, the first load and the second load are powered by the first section bus, the change-over switch and the second output switch are closed, the first output switch is opened, the first dynamic voltage restorer stops running, the second dynamic voltage restorer runs normally, and the voltage compensation function when the single bus of the first section bus supplies power is realized.
The two sets of dynamic voltage recoverers can also be respectively provided with output switches at the output ends close to one side of the corresponding incoming line switch and then are connected with the corresponding incoming line switch, and the two output switches are interconnected at one side close to the incoming line switch through the change-over switch; when the voltages of the first section bus and the second section bus are normal, the bus-bar switch is opened, the first incoming line switch and the second incoming line switch are closed, the change-over switch is opened, the first output switch and the second output switch are closed, the first dynamic voltage restorer and the second dynamic voltage restorer are used for cross power taking, and the operation is normal; when the first section bus is powered off and the second section bus is normal, the bus-bar switch is closed, the first inlet wire switch is opened, the second inlet wire switch is closed, the first load and the second load are powered by the second section bus, the change-over switch and the first output switch are closed, the second output switch is opened, the second dynamic voltage restorer stops running, and the first dynamic voltage restorer operates normally, so that the voltage compensation function of the second section bus during single bus power supply is realized; when the second section bus loses electricity, the first section bus is normal, the bus-bar switch is closed, the second inlet wire switch is opened, the first inlet wire switch is closed, the first load and the second load are powered by the first section bus, the change-over switch and the second output switch are closed, the first output switch is opened, the first dynamic voltage restorer stops running, the second dynamic voltage restorer operates normally, and the voltage compensation function when the single bus of the second section bus supplies power is realized.
The beneficial effects of the invention are as follows:
1) The invention realizes cross power taking by arranging two sets of dynamic voltage recoverers, solves the problem of voltage drop of a direct-current energy storage circuit in a DVR caused by alternating-current voltage drop of one section of bus, and has the advantages of low cost, simple structure, stability and reliability.
2) The invention is not only suitable for medium and small power DVRs, but also suitable for high power and super high power DVRs, and enlarges the application range of the DVRs.
Drawings
Fig. 1 is a schematic diagram of a conventional dynamic voltage restorer.
Fig. 2 is a block diagram of the dynamic voltage recovery device of the present invention.
Fig. 3 is a schematic diagram of an embodiment 1 of a dynamic voltage recovery device according to the present invention.
Fig. 4 is a schematic diagram of an embodiment 2 of a dynamic voltage recovery device according to the present invention.
Fig. 5 is a schematic diagram of an embodiment 3 of a dynamic voltage recovery device according to the present invention.
In the figure: 1. a first dynamic voltage restorer; 101. A first converter unit; 102. A first filter inductance unit; 103. A first filter capacitor unit; 104. A first coupling transformer unit; 105. A first fast bypass switching unit; 106. a first maintenance switch, 107, a second maintenance switch; 108. a first bypass service switch;
2. a second dynamic voltage restorer; 201. A second converter unit; 202. A second filter inductance unit; 203. A second filter capacitor unit; 204. A second coupling transformer unit; 205. A second fast bypass switching unit; 206. A third service switch; 207. A fourth service switch; 208. A second bypass service switch;
q1, a first incoming line switch; q2, a second incoming line switch; q3, a bus switch; q4, a change-over switch; q5, a first output switch; q6, a second output switch.
Detailed Description
According to fig. 1, the existing Dynamic Voltage Restorer (DVR) comprises a set of first dynamic voltage restorer 1, wherein the first dynamic voltage restorer 1 is connected in series between a first incoming line switch Q1 and a load, and an input end of the first dynamic voltage restorer 1 is connected with an output end of the first incoming line switch Q1. The first dynamic voltage restorer 1 comprises a first converter unit 101, a first filter inductance unit 102, a first filter capacitance unit 103, a first coupling transformer unit 104, a first fast bypass switch unit 105, a first overhaul switch 106, a second overhaul switch 107 and a first bypass overhaul switch 108. The input end of the first current transformer unit 101 is used as the input end of the first dynamic voltage restorer 1, the left end output end of the first current transformer unit 101 is connected with the input end of the first filter inductance unit 102, the right end output end of the first current transformer unit 101 is connected with the first filter capacitance unit 103, and the first filter capacitance unit 103 is connected in parallel between the output end of the first filter inductance unit 102 and the lower end output end of the first current transformer unit 101. The secondary side of the first coupling transformer unit 104 is connected in parallel with the first filter capacitor unit 103. The primary side of the first coupling transformer unit 104 is connected in parallel with the first fast bypass switching unit 105. The first bypass maintenance switch 108 is connected in series between the first inlet switch Q1 and the load, one end, close to the first inlet switch Q1, of the first coupling transformer unit 104 after being connected in parallel with the first fast bypass switch unit 105 is connected with the first inlet switch Q1 through the first maintenance switch 106, and one end, close to the load, of the first coupling transformer unit 104 after being connected in parallel with the first fast bypass switch unit 105 is connected with the load through the second maintenance switch 107.
The first converter unit 101 is an ac-dc-ac converter, and includes an input rectifying circuit, a dc energy storage circuit, and an output inverter circuit. The input rectifying circuit can comprise an input transformer, and the rectifying circuit can adopt diodes, silicon controlled rectifier or PWM active rectification; the direct current energy storage circuit can be a capacitor, a super capacitor, a storage battery or a combination thereof; the output inverter circuit can be a voltage source type inverter circuit with two levels, three levels and five levels, and the units are connected in series with multiple levels or other topological structures; the input rectifying circuit can be single-phase or three-phase, the output inverting circuit can be single-phase or three-phase, and the three phases are neutral or three-phase are neutral.
The first service switch 106, the second service switch 107, the first bypass service switch 108 and the first fast bypass switch unit 105 may be electronic switches, mechanical switches or a combination thereof. When the DVR works normally, the first bypass maintenance switch 108 is opened, the first maintenance switch 106 and the second maintenance switch 107 are both closed, and the DVR works normally. When the DVR fails, the first bypass maintenance switch 108 is closed, and the first maintenance switch 106 and the second maintenance switch 107 are both opened to bypass the DVR, so that normal power supply of the load is not affected. The first filter inductance unit 102 and the first filter capacitance unit 103 are used for filtering high-frequency voltage components of the inverter circuit output by the converter, so that harmonic pollution is avoided.
When the DVR works normally, if the grid voltage drops, in order to provide a stable direct current power supply for the output inverter circuit of the first converter unit 101, a voltage stabilizing device needs to be configured in the direct current energy storage circuit of the inverter, and the current of the voltage stabilizing device needs to consider the condition when the grid voltage drops maximally, so that the maximum current of the voltage stabilizing device is far greater than the current when the grid voltage operates nominally, the whole size and the cost of the device need to be considered according to the worst condition, and the device is limited by the size and the cost of the voltage stabilizing device, so that the power of the existing dynamic voltage restorer cannot be very high and can only be suitable for medium and small power.
According to fig. 2, the invention relates to a dynamic voltage recovery device with cross power taking, which comprises a first dynamic voltage restorer 1 and a second dynamic voltage restorer 2. The first dynamic voltage restorer 1 is arranged between the first section bus and the first inlet switch Q1, and the first load is connected with the first section bus. The second dynamic voltage restorer 2 is arranged between the second section bus and the second inlet switch Q2, and the second load is connected with the second section bus. Meanwhile, the input end of the first dynamic voltage restorer 1 is provided with an output end connected to the second inlet wire switch Q2 in a connecting way, and the input end of the second dynamic voltage restorer 2 is provided with an output end connected to the first inlet wire switch Q1 in a connecting way.
According to fig. 3, taking a first set of dynamic voltage restorer as an example, the first set of dynamic voltage restorer mainly comprises a first converter unit 101, a first filter inductance unit 102, a first filter capacitance unit 103, a first coupling transformer unit 104, a first fast bypass switch unit 105, a first maintenance switch 106, a second maintenance switch 107 and a first bypass maintenance switch 108, wherein the first section bus bar and the second section bus bar are connected through a bus bar switch Q3.
The first converter unit 101 includes an output inverter circuit, a dc energy storage circuit, and an input rectifying circuit, the input end of the first converter unit 101 is used as the input end of the first dynamic voltage restorer 1, the first converter unit 101 has two output ends, one end of which is connected to the input end of the first filter inductance unit 102, and the other end of which is connected to one end of the first filter capacitance unit 103. The other end of the first filter capacitor unit 103 is connected with the output end of the first filter inductor unit 102. The secondary side of the first coupling transformer unit 104 is connected in parallel with the first filter capacitor unit 103, and the first bypass maintenance switch 108 is connected in series between the first inlet switch Q1 and the first load. The primary side of the first coupling transformer unit 104 is connected in parallel with the first fast bypass switch unit 105, and then one end close to the first inlet switch Q1 is connected with the first inlet switch Q1 through the first maintenance switch 106, and the primary side of the first coupling transformer unit 104 is connected in parallel with the first fast bypass switch unit 105, and then one end close to the first load is connected with the first load through the second maintenance switch 107.
The second dynamic voltage restorer 2 and the first dynamic voltage restorer 1 are identical or similar in structure.
The probability of voltage drop of two sections of buses in the power grid is very small, when the voltage of a first section of bus drops, the voltage of a second section of bus is generally in a normal state, and as the input power supply of the first dynamic voltage restorer 1 is taken from the second section of bus, when the voltage of the first section of bus drops, the voltage of the direct-current energy storage circuit of the converter unit of the first dynamic voltage restorer 1 cannot drop, so that the structure of the direct-current energy storage circuit is greatly simplified, and the capacity of the first dynamic voltage restorer 1 can be quite large, thereby being applied to high power.
The invention is further illustrated by the following examples:
example 1:
according to fig. 3, in the cross-power-taking dynamic voltage recovery device of the present invention, the first converter unit 101 and the second converter unit 201 each have a centralized common dc bus, and the dc buses of the first converter unit 101 and the second converter unit 201 are connected in parallel.
The working method of the cross power-taking dynamic voltage recovery device in the embodiment is as follows:
when the voltages of the first section bus and the second section bus are normal, the busbar switch Q3 is opened, the first incoming line switch Q1 and the second incoming line switch Q2 are closed, and the first dynamic voltage restorer 1 and the second dynamic voltage restorer 2 are powered by a cross mode and operate normally.
When the first section bus is in power failure and the second section bus is normal, the bus-bar switch Q3 is closed, the first inlet-line switch Q1 is opened, the second inlet-line switch Q2 is closed, the first load and the second load are powered by the second section bus, the output inverter circuit of the first dynamic voltage restorer 1 and the input rectifying circuit of the second dynamic voltage restorer 2 stop running, the output inverter circuit of the second dynamic voltage restorer 2 and the input rectifying circuit of the first dynamic voltage restorer 1 run normally, and the voltage compensation function during single bus power supply is realized.
When the second section bus loses electricity and the first section bus is normal, the bus-bar switch Q3 is closed, the second inlet-line switch Q2 is opened, the first inlet-line switch Q1 is closed, the first load and the second load are powered by the first section bus, the output inverter circuit of the second dynamic voltage restorer 2 and the input rectifying circuit of the first dynamic voltage restorer 1 stop running, the output inverter circuit of the first dynamic voltage restorer 1 and the input rectifying circuit of the second dynamic voltage restorer 2 run normally, and the voltage compensation function during single bus power supply is realized.
Example 2:
according to fig. 4, in the cross power-taking dynamic voltage recovery device of the present invention, the output end of the first dynamic voltage restorer 1, which is close to the first section bus, is connected with the first section bus through the first output switch Q5; the output end, close to the second section bus, of the second dynamic voltage restorer 2 is connected with the second section bus through a second output switch Q6, and the output ends, close to the wire inlet switch, of the first dynamic voltage restorer 1 and the second dynamic voltage restorer 2 are connected through a change-over switch Q4. The output inverter circuit of the first converter unit 101 may be a voltage source inverter circuit with two levels, three levels, five levels, and multiple levels or other topologies connected in series.
The working method of the cross power-taking dynamic voltage recovery device in the embodiment is as follows:
when the voltages of the first section bus and the second section bus are normal, the busbar switch Q3 is opened, the first incoming line switch Q1 and the second incoming line switch Q2 are closed, the change-over switch Q4 is opened, and the first output switch Q5 and the second output switch Q6 are closed. And the first dynamic voltage restorer 1 and the second dynamic voltage restorer 2 are powered in a crossing way and operate normally.
When the first section bus is powered off and the second section bus is normal, the bus-bar switch Q3 is closed, the first incoming line switch Q1 is opened, the second incoming line switch Q2 is closed, the first load and the second load are powered by the second section bus, the change-over switch Q4 and the first output switch Q5 are closed, the second output switch Q6 is opened, the second dynamic voltage restorer 2 stops running, the first dynamic voltage restorer 1 runs normally, and the voltage compensation function during single bus power supply is realized.
When the second section bus loses electricity and the first section bus is normal, the bus-bar switch Q3 is closed, the second incoming line switch Q2 is opened, the first incoming line switch Q1 is closed, the first load and the second load are powered by the first section bus, the change-over switch Q4 and the second output switch Q6 are closed, the first output switch Q5 is opened, the first dynamic voltage restorer 1 stops running, the second dynamic voltage restorer 2 runs normally, and the voltage compensation function during single bus power supply is realized.
Example 3:
according to fig. 5, in the cross power-taking dynamic voltage recovery device of the present invention, the output end of the first dynamic voltage restorer 1, which is close to the first wire inlet switch Q1, is connected with the first wire inlet switch Q1 through the first output switch Q5; the output end of the second dynamic voltage restorer 2, which is close to the second inlet wire switch Q2, is connected with the second inlet wire switch Q2 through a second output switch Q6. One end, close to the incoming line switch, of the first output switch Q5 and one end, close to the incoming line switch, of the second output switch Q6 are connected through a change-over switch Q4. The output inverter circuit of the first converter unit 101 may be a voltage source inverter circuit with two levels, three levels, five levels, and multiple levels or other topologies connected in series.
The working method of the cross power-taking dynamic voltage recovery device in the embodiment is as follows:
when the voltages of the first section bus and the second section bus are normal, the busbar switch Q3 is opened, the first incoming line switch Q1 and the second incoming line switch Q2 are closed, the change-over switch Q4 is opened, and the first output switch Q5 and the second output switch Q6 are closed. And the first dynamic voltage restorer 1 and the second dynamic voltage restorer 2 are powered in a crossing way and operate normally.
When the first section bus is powered off and the second section bus is normal, the bus-bar switch Q3 is closed, the first incoming line switch Q1 is opened, the second incoming line switch Q2 is closed, the first load and the second load are powered by the second section bus, the change-over switch Q4 and the first output switch Q5 are closed, the second output switch Q6 is opened, the second dynamic voltage restorer 2 stops running, the first dynamic voltage restorer 1 runs normally, and the voltage compensation function during single bus power supply is realized.
When the second section bus loses electricity and the first section bus is normal, the bus-bar switch Q3 is closed, the second incoming line switch Q2 is opened, the first incoming line switch Q1 is closed, the first load and the second load are powered by the first section bus, the change-over switch Q4 and the second output switch Q6 are closed, the first output switch Q5 is opened, the first dynamic voltage restorer 1 stops running, the second dynamic voltage restorer 2 runs normally, and the voltage compensation function during single bus power supply is realized.
The invention can solve the problem of voltage drop of a direct-current energy storage circuit in DVR caused by alternating-current voltage drop of one section of bus by arranging two sets of dynamic voltage recoverers and adopting a cross power-taking mode. The dynamic voltage recovery device for cross power taking disclosed by the invention is not only suitable for medium-low power DVRs, but also suitable for high-power and super-high power DVRs, and the application range of the DVRs is enlarged.
The above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention, so that those skilled in the art may make various equivalent modifications, changes and substitutions to the embodiments according to the present disclosure, and all such equivalent modifications, changes and substitutions should be included in the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A dynamic voltage recovery device for cross power taking is characterized in that: the dynamic voltage recovery device comprises two sets of dynamic voltage recoverers with the same structure, namely a first dynamic voltage recoverer and a second dynamic voltage recoverer, wherein the two sets of dynamic voltage recoverers are respectively arranged between a corresponding first section bus and a first incoming line switch and between a corresponding second section bus and a corresponding second incoming line switch, meanwhile, the input end of the first dynamic voltage recoverer is provided with an output end connected to the second incoming line switch through a connecting wire, and the input end of the second dynamic voltage recoverer is provided with an output end connected to the first incoming line switch through a connecting wire.
2. The cross-power-taking dynamic voltage recovery device according to claim 1, wherein: the dynamic voltage restorer comprises a converter unit, a filter inductance unit, a filter capacitance unit, a coupling transformer unit, a rapid bypass switch unit, a first maintenance switch, a second maintenance switch and a bypass maintenance switch, wherein the first section bus and the second section bus are connected through a bus connection switch.
3. The cross-power-taking dynamic voltage recovery device according to claim 2, wherein: the converter unit comprises an output inverter circuit, a direct current energy storage circuit and an input rectifying circuit, wherein the input end of the converter unit is used as the input end of the dynamic voltage restorer, the converter unit is provided with two output ends, one end of the converter unit is connected with the input end of the filter inductance unit, the other end of the converter unit is connected with one end of the filter capacitance unit, the other end of the filter capacitance unit is connected with the output end of the filter inductance unit, the secondary side of the coupling transformer unit is connected with the filter capacitance unit in parallel, the bypass overhaul switch is connected between the inlet wire switch and a load in series, one end, close to the inlet wire switch, of the coupling transformer unit is connected with the inlet wire switch through the first overhaul switch after the primary side of the coupling transformer unit is connected with one end, close to the load, of the coupling transformer unit is connected with the load through the second overhaul switch after the primary side of the coupling transformer unit is connected with the fast bypass switch in parallel.
4. The cross-power-taking dynamic voltage recovery device according to claim 1, wherein: the converter units in the two sets of dynamic voltage recoverers are respectively powered by a centralized and shared direct current bus.
5. The cross-power-taking dynamic voltage recovery device according to claim 1, wherein: the two sets of dynamic voltage recoverers are respectively provided with an output switch at the output ends close to the corresponding buses and are connected with the output ends close to the corresponding incoming line switches through a change-over switch.
6. The cross-power-taking dynamic voltage recovery device according to claim 1, wherein: the two sets of dynamic voltage recoverers are respectively provided with an output switch at the output end close to one side of the corresponding incoming line switch and then are connected with the corresponding incoming line switch, and the two output switches are interconnected at one side close to the incoming line switch through a change-over switch.
7. A method for operating a dynamic voltage recovery device for cross power extraction according to any one of claims 1 to 6, characterized in that: the dynamic voltage recovery device comprises two sets of dynamic voltage recoverers with the same structure, namely a first dynamic voltage recoverer and a second dynamic voltage recoverer, which are respectively arranged between a corresponding first section bus and a first incoming line switch and between a corresponding second section bus and a corresponding second incoming line switch, meanwhile, the input end of the first dynamic voltage recoverer is provided with an output end connected with the second incoming line switch by a connecting wire, the input end of the second dynamic voltage recoverer is provided with an output end connected with the first incoming line switch by a connecting wire, and the dynamic voltage recoverer comprises a converter unit, a filter inductance unit, a filter capacitance unit, a coupling transformer unit, a rapid bypass switch unit, a first maintenance switch, a second maintenance switch and a bypass maintenance switch, and the first section bus and the second section bus are connected by a bus-bar switch; when the voltages of the first section bus and the second section bus are normal, the bus-bar switch is opened, the first wire-inlet switch and the second wire-inlet switch are closed, the first dynamic voltage restorer and the second dynamic voltage restorer are used for cross power taking, and the bus-bar switch operates normally.
8. The method for operating a cross-powered dynamic voltage recovery apparatus of claim 7, wherein: the converter units in the two sets of dynamic voltage recoverers are respectively powered by concentrated and shared direct current buses, when a first section of bus is in power failure and a second section of bus is normal, a bus-bar switch is closed, a first incoming line switch is opened, a second incoming line switch is closed, a first load and a second load are powered by the second section of bus, an output inverter circuit of the converter unit in the first dynamic voltage recoverer and an input rectifying circuit of the converter unit in the second dynamic voltage recoverer stop running, and an output inverter circuit of the second dynamic voltage recoverer and an input rectifying circuit of the first dynamic voltage recoverer normally run, so that a voltage compensation function in the process of single bus power supply of the second section of bus is realized; when the second section bus is powered off and the first section bus is normal, the bus-bar switch is closed, the second inlet-line switch is opened, the first inlet-line switch is closed, the first load and the second load are powered by the first section bus, the output inverter circuit of the second dynamic voltage restorer and the input rectifying circuit of the first dynamic voltage restorer stop running, the output inverter circuit of the first dynamic voltage restorer and the input rectifying circuit of the second dynamic voltage restorer run normally, and the voltage compensation function when the single bus of the first section bus is powered is realized.
9. The method for operating a cross-powered dynamic voltage recovery apparatus of claim 7, wherein: the two sets of dynamic voltage recoverers are respectively provided with an output switch at the output ends close to the corresponding buses and are connected through a change-over switch at the output ends close to the corresponding incoming line switches, when the voltages of the first section of buses and the second section of buses are normal, the bus-bar switch is opened, the first incoming line switch and the second incoming line switch are closed, the change-over switch is opened, the first output switch and the second output switch are closed, and the first dynamic voltage recoverer and the second dynamic voltage recoverer are powered by crossing and operate normally; when the first section bus is powered off and the second section bus is normal, the bus-bar switch is closed, the first inlet wire switch is opened, the second inlet wire switch is closed, the first load and the second load are powered by the second section bus, the change-over switch and the first output switch are closed, the second output switch is opened, the second dynamic voltage restorer stops running, and the first dynamic voltage restorer operates normally, so that the voltage compensation function of the second section bus during single bus power supply is realized; when the second section bus loses electricity, the first section bus is normal, the bus-bar switch is closed, the second inlet wire switch is opened, the first inlet wire switch is closed, the first load and the second load are powered by the first section bus, the change-over switch and the second output switch are closed, the first output switch is opened, the first dynamic voltage restorer stops running, the second dynamic voltage restorer runs normally, and the voltage compensation function when the single bus of the first section bus supplies power is realized.
10. The method for operating a cross-powered dynamic voltage recovery apparatus of claim 7, wherein: the two sets of dynamic voltage recoverers are respectively provided with an output switch at the output end close to one side of the corresponding incoming line switch and then are connected with the corresponding incoming line switch, and the two output switches are interconnected at one side close to the incoming line switch through a change-over switch; when the voltages of the first section bus and the second section bus are normal, the bus-bar switch is opened, the first incoming line switch and the second incoming line switch are closed, the change-over switch is opened, the first output switch and the second output switch are closed, the first dynamic voltage restorer and the second dynamic voltage restorer are used for cross power taking, and the operation is normal; when the first section bus is powered off and the second section bus is normal, the bus-bar switch is closed, the first inlet wire switch is opened, the second inlet wire switch is closed, the first load and the second load are powered by the second section bus, the change-over switch and the first output switch are closed, the second output switch is opened, the second dynamic voltage restorer stops running, and the first dynamic voltage restorer operates normally, so that the voltage compensation function of the second section bus during single bus power supply is realized; when the second section bus loses electricity, the first section bus is normal, the bus-bar switch is closed, the second inlet wire switch is opened, the first inlet wire switch is closed, the first load and the second load are powered by the first section bus, the change-over switch and the second output switch are closed, the first output switch is opened, the first dynamic voltage restorer stops running, the second dynamic voltage restorer operates normally, and the voltage compensation function when the single bus of the second section bus supplies power is realized.
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