CN114498721A - AC field out-of-string operation method and system of flexible DC power transmission system - Google Patents
AC field out-of-string operation method and system of flexible DC power transmission system Download PDFInfo
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- CN114498721A CN114498721A CN202210096116.4A CN202210096116A CN114498721A CN 114498721 A CN114498721 A CN 114498721A CN 202210096116 A CN202210096116 A CN 202210096116A CN 114498721 A CN114498721 A CN 114498721A
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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 an alternating current field outlet string operation method and system of a flexible direct current transmission system. The method is applied to an alternating current field wiring system of a flexible direct current transmission system, wherein the alternating current field wiring system comprises a converter transformer, at least one power circuit, at least one breaker group, a first bus and a second bus; the at least one power supply circuit comprises a first power supply circuit, a second power supply circuit and a third power supply circuit; each power circuit comprises a knife switch; the method comprises the following steps: controlling the on-off of a breaker group and a disconnecting link to enable the converter transformer and at least one power line to be electrically connected to the first bus or the second bus, and identifying whether the first bus or the second bus needs to be overhauled; when the first bus or the second bus needs to be overhauled, the alternating current field is controlled to enter a string-out running state, and therefore the possibility of direct current outage is avoided.
Description
Technical Field
The embodiment of the invention relates to a flexible direct current transmission technology, in particular to an alternating current field outlet string operation method and system of a flexible direct current transmission system.
Background
Compared with alternating current transmission, flexible direct current transmission has better economy and applicability in long-distance and large-capacity transmission occasions; meanwhile, when the interconnection of the power grids is realized by adopting a flexible direct current transmission mode, the increase of short-circuit capacity is avoided, and the expansion of the fault of an alternating current system is favorably prevented; and the flexible direct current transmission also has the characteristic of rapid and controllable power flow, and can be used for the stability and frequency control of a connected power grid system. It is precisely because of the good economy, interconnectivity and controllability of flexible dc transmission that has been rapidly developed in recent years in power systems.
An ac field is an important component of a converter station, and three-half connections are the most common connection means for ac fields. Three-half connections are the most common connection for ac fields, and are formed by connecting two elements (lines or converters) to two sets of busbars with three circuit breakers. Normally, a three-half connection mode is that a converter transformer and a line are connected to the same bus together to complete charging, and when the serial side switch needs to be completely disconnected due to bus maintenance and the like, the direct current is usually shut down by manual operation of an operator or by controlling trip logic in a main machine, so that the possibility and time of direct current shutdown are increased.
Disclosure of Invention
The invention provides an alternating current field out-of-string running method and system of a flexible direct current transmission system, which are used for controlling an alternating current field to enter an out-of-string running state when buses are overhauled, and a converter transformer in the alternating current field normally supplies power to the direct current field, so that the possibility of direct current outage is avoided.
In a first aspect, an embodiment of the present invention provides an ac field out-of-string operation method for a flexible dc power transmission system, where the method is applied to an ac field wiring system of the flexible dc power transmission system, where the ac field wiring system includes a converter transformer, at least one power line, at least one breaker group, a first bus and a second bus;
at least one breaker group comprises a first breaker group and a second breaker group; the first circuit breaker group comprises a first side switch, a first middle switch and a second side switch; the second circuit breaker group comprises a third side switch, a second middle switch and a fourth side switch; the first side switch and the third side switch are both electrically connected with the first bus; the second side switch and the fourth side switch are both electrically connected with the second bus; the first side switch is electrically connected with the second side switch through the first intermediate switch; the third side switch is electrically connected with the fourth side switch through the second middle switch;
the at least one power supply circuit comprises a first power supply circuit, a second power supply circuit and a third power supply circuit; each power circuit comprises a knife switch; the converter transformer is electrically connected with the second end of the first intermediate switch; the first power supply line is electrically connected with a first end of the first intermediate switch; the second power supply line is electrically connected with the second end of the second intermediate switch, and the third power supply line is electrically connected with the first end of the second intermediate switch;
the alternating current field outlet operation method comprises the following steps:
controlling the on-off of the breaker group and the disconnecting link so as to electrically connect the converter transformer and at least one power line to the first bus or the second bus;
identifying whether the first bus bar or the second bus bar needs to be serviced;
and when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state.
Optionally, the first power line includes a first switch; the second power supply line comprises a second knife switch; the third power supply line comprises a third knife switch;
controlling the switch of the breaker group and the knife switch to electrically connect the converter transformer and at least one power line to the first bus or the second bus, comprising:
controlling the first side switch and the first intermediate switch to be closed, controlling the second side switch, the third side switch, the second intermediate switch and the fourth side switch to be opened, and controlling the first knife switch to be closed, the second knife switch and the third knife switch to be opened so that the converter transformer and the first power supply circuit are electrically connected to the first bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
and when the first bus needs to be overhauled, the first side switch is controlled to be switched off, and the first middle switch is kept to be switched on.
Optionally, controlling the on/off of the circuit breaker group and the knife switch to electrically connect the converter transformer and at least one of the power lines to the first bus or the second bus includes:
controlling the first side switch, the first middle switch and the third side switch to be closed, controlling the second side switch, the second middle switch and the fourth side switch to be opened, and controlling the first knife switch to be opened, the second knife switch to be closed and the third knife switch to be opened so that the converter transformer and the second power supply circuit are electrically connected to the first bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
when the first bus needs to be overhauled, the first side switch and the third side switch are controlled to be disconnected, the first knife switch is controlled to be closed, the second knife switch is controlled to be disconnected, and the first middle switch is kept closed.
Optionally, controlling the on/off of the circuit breaker group and the knife switch to electrically connect the converter transformer and at least one of the power lines to the first bus or the second bus includes:
controlling the first edge switch, the first middle switch, the third edge switch and the second middle switch to be closed, controlling the second edge switch and the fourth edge switch to be opened, and controlling the first knife switch to be opened, the second knife switch to be opened and the third knife switch to be closed so that the converter transformer and the third power supply circuit are electrically connected to the first bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
when the first bus needs to be overhauled, the first edge switch, the third edge switch and the second middle switch are controlled to be disconnected, and the first disconnecting link is controlled to be closed and the third disconnecting link is controlled to be disconnected.
Optionally, controlling the switch group and the switch to open and close to electrically connect the converter transformer and at least one of the power lines to the first bus or the second bus includes:
controlling the first intermediate switch and the third edge switch to be closed, controlling the first edge switch, the third edge switch, the second intermediate switch and the fourth edge switch to be opened, and controlling the first knife switch to be closed, the second knife switch to be opened and the third knife switch to be opened so that the converter transformer and the first power supply circuit are electrically connected to the second bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
and when the second bus needs to be overhauled, controlling the second side switch to be switched on and off, and keeping the first middle switch closed.
Optionally, controlling the switch group and the switch to open and close to electrically connect the converter transformer and at least one of the power lines to the first bus or the second bus includes:
controlling the second side switch, the second intermediate switch and the fourth side switch to be closed, controlling the first side switch, the first intermediate switch and the third side switch to be opened, and controlling the second disconnecting link to be closed, the first disconnecting link to be opened and the third disconnecting link to be opened so that the converter transformer and the second power supply circuit are electrically connected to the second bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
when the second bus needs to be overhauled, the second side switch, the second middle switch and the fourth side switch are controlled to be both disconnected, the first middle switch is controlled to be closed, the first knife switch is controlled to be closed, and the second knife switch is controlled to be disconnected.
Optionally, controlling the on/off of the circuit breaker group and the knife switch to electrically connect the converter transformer and at least one of the power lines to the first bus or the second bus includes:
controlling the second side switch and the fourth side switch to be closed; the first side switch, the first middle switch, the third side switch and the second middle switch are controlled to be switched off, and the first disconnecting link, the second disconnecting link and the third disconnecting link are controlled to be switched on so that the converter transformer and the third power supply circuit are electrically connected to the second bus;
when the first bus or the second bus needs to be overhauled, the alternating current field is controlled to enter a string-out running state, and the method comprises the following steps:
when the second bus needs to be overhauled, the second side switch and the fourth side switch are controlled to be both disconnected, the first middle switch is controlled to be closed, and the first disconnecting link is controlled to be closed and the third disconnecting link is controlled to be disconnected.
Optionally, identifying whether the first bus or the second bus needs to be serviced includes:
acquiring the temperature of the first bus or the second bus measured by an infrared thermometer;
and identifying whether the first bus or the second bus needs to be overhauled or not according to the temperature of the first bus or the second bus.
Optionally, identifying whether the first bus or the second bus needs to be overhauled according to the temperature of the first bus or the second bus includes:
and when the temperature of the first bus or the second bus is higher than the preset temperature, the first bus or the second bus needs to be overhauled.
In a second aspect, an embodiment of the present invention further provides an ac field outlet serial operation system of a flexible dc power transmission system, where the ac field outlet serial operation system includes a controller and the ac field wiring system; the controller is configured to perform the ac field outlet string operation method of the flexible dc power transmission system according to the first aspect.
In the embodiment of the present invention, the switching of the circuit breaker group and the disconnecting link is controlled to electrically connect the converter transformer and at least one of the power lines to the first bus or the second bus; identifying whether the first bus or the second bus needs to be overhauled; when the first bus or the second bus needs to be overhauled, the alternating current field is controlled to enter a string-out running state so that the converter transformer is directly and electrically connected with a power line, and therefore the converter transformer in the alternating current field normally supplies power to the direct current field, and the possibility of direct current outage is avoided.
Drawings
Fig. 1 is a flowchart of an ac field out-of-string operation method of a flexible dc power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ac field wiring system of a flexible dc power transmission system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an ac field outlet series operation system of a flexible dc power transmission system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of an ac field outlet serial operation method of a flexible dc power transmission system according to an embodiment of the present invention, where as shown in fig. 1, the ac field outlet serial operation method includes the following steps:
s110, controlling the opening and closing of the breaker group and the disconnecting link to enable the converter transformer and at least one power line to be electrically connected to the first bus or the second bus.
Fig. 2 is a schematic structural diagram of an ac field wiring system of a flexible dc power transmission system according to an embodiment of the present invention, and as shown in fig. 2, the ac field wiring system includes a converter transformer 10, at least one power line 20, at least one breaker group 30, a first bus 40, and a second bus 50; the at least one breaker set 30 includes a first breaker set 31 and a second breaker set 32; the first breaker group 31 includes a first side switch 311, a first intermediate switch 312, and a second side switch 313; the second breaker group 32 includes a third side switch 321, a second intermediate switch 322, and a fourth side switch 323; the first side switch 311 and the third side switch 321 are both electrically connected to the first bus bar 40; the second side switch 313 and the fourth side switch 323 are both electrically connected with the second bus 50; the first side switch 311 is electrically connected to the second side switch 313 through the first intermediate switch 312; the third side switch 321 is electrically connected to the fourth side switch 323 through the second intermediate switch 322. The at least one power supply line 20 includes a first power supply line 21, a second power supply line 22, and a third power supply line 23; each power circuit comprises a knife switch; the first power supply line 21 includes a first blade brake 211; the second power supply line 22 includes a second knife switch 221; the third power supply line 23 includes a third knife switch 231; the converter transformer 10 is electrically connected to a second end of the first intermediate switch 312; the first power supply line 21 is electrically connected to a first end of the first intermediate switch 312; the second power supply line 32 is electrically connected to a second terminal of the second intermediate switch 322, and the third power supply line 23 is electrically connected to a first terminal of the second intermediate switch 322.
Wherein each power line 20 is electrically connected to an ac power source; the converter transformer 10 is a transformer; the converter transformer 10 is electrically connected with a direct current field (the direct current field comprises an inverter); before the dc unlocking, the converter transformer 10 needs to be electrically connected to each power line on the first bus 40 or the second bus 50 to complete the charging with the ac source as the dc field, and this scheme controls the opening and closing of the breaker set 30 and the disconnecting link to electrically connect the converter transformer 10 and at least one power line 20 on the first bus 40 or the second bus 50 to complete the dc unlocking. For example, referring to fig. 2, the control converter transformer 10 and the third power line 23 are electrically connected to the second bus bar 50, that is, the second side switch 313 and the fourth side switch 323 are both controlled to be closed; and the first side switch 311, the first middle switch 312, the third side switch 321 and the second middle switch 322 are controlled to be opened, and the first knife switch 211 is controlled to be opened, the second knife switch 221 is controlled to be opened and the third knife switch 231 is controlled to be closed so that the converter transformer 10 and the third power line 23 are electrically connected on the second bus bar 50 to complete the direct current unlocking. It should be understood, however, that the present embodiment is not limited to the specific way in which the converter transformer 10 and the at least one power line 20 are electrically connected to the first bus bar 40 or the second bus bar 50.
And S120, identifying whether the first bus or the second bus needs to be overhauled.
In this embodiment, an infrared thermometer may be used to detect the temperature of the first bus 40 or the second bus 50 to determine whether the first bus 40 or the second bus 50 needs to be repaired, and when the temperature of the first bus or the second bus is greater than a preset temperature, it is identified that the first bus or the second bus needs to be repaired.
And S130, when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state.
When the first bus or the second bus needs to be overhauled, the alternating current field is controlled to enter the out-of-string running state so that the power supply circuit 20 is directly and electrically connected with the converter transformer 10, and therefore the converter transformer in the alternating current field normally supplies power to the direct current field, and the possibility of direct current outage is avoided. The problem of in the prior art, because before the direct current unblock the current conversion becomes 10 and power supply line 20 electricity is connected on first bus or on the second bus, like this when first bus or second bus need overhaul, need in time to break off with each side switch of first bus or second bus electricity connection, the current conversion in the alternating current field becomes unable for the direct current field power supply like this, has increased the time of direct current outage is solved. Illustratively, referring to fig. 2, after the converter transformer 10 and the third power line 23 are electrically connected to the second bus 50, when the second bus needs to be repaired, the second side switch 313 and the fourth side switch 323 are both controlled to be opened, the first intermediate switch 312 is controlled to be closed, and the first disconnecting link 211 is controlled to be closed and the third disconnecting link 231 is controlled to be opened, so that the ac field enters the out-of-string operation state.
Specifically, the control of the ac field entering the out-of-string running state is further refined based on the way that different converter transformers 10 and power lines 20 are electrically connected to the first bus or the second bus; the present embodiment is specifically divided into the following modes:
the converter transformer 10 and the first power line 21 are controlled to be electrically connected to the first bus 40, that is, the first side switch 311 and the first intermediate switch 312 are controlled to be closed, the second side switch 313, the third side switch 321, the second intermediate switch 322 and the fourth side switch 323 are controlled to be opened, and the first knife switch 211 is controlled to be closed, the second knife switch 221 and the third knife switch 231 are controlled to be opened, so that the converter transformer 10 and the first power line 21 are electrically connected to the first bus 40; when the first bus 40 needs to be repaired, the first side switch 311 is controlled to be opened, and the first intermediate switch 312 is kept closed, so that the alternating current field enters the out-of-string running state.
The converter transformer 10 and the second power line 22 are controlled to be electrically connected to the first bus 40, that is, the first side switch 311, the first middle switch 312 and the third side switch 321 are controlled to be closed, the second side switch 313, the second middle switch 322 and the fourth side switch 323 are controlled to be opened, and the first knife switch 211 is controlled to be opened, the second knife switch 221 is controlled to be closed and the third knife switch 231 is controlled to be opened, so that the converter transformer 10 and the second power line 22 are electrically connected to the first bus 40; at this time, when the first bus 40 needs to be overhauled, the first side switch 311 and the third side switch are controlled to be opened 321, the first knife switch 211 is controlled to be closed, the second knife switch 221 is controlled to be opened, and the first intermediate switch 312 is kept closed so that the alternating current field enters a string outlet running state.
The converter transformer 10 and the third power line 23 are controlled to be electrically connected to the first bus 40, that is, the first side switch 311, the first intermediate switch 312, the third side switch 321 and the second intermediate switch 322 are controlled to be closed, the second side switch 313 and the fourth side switch 323 are controlled to be opened, and the first knife switch 211 is controlled to be opened, the second knife switch 221 is controlled to be opened, and the third knife switch 231 is controlled to be closed, so that the converter transformer 10 and the third power line 23 are electrically connected to the first bus; at this time, when the first bus 40 needs to be overhauled, the first side switch 311, the third side switch 321 and the second intermediate switch 322 are controlled to be opened, and the first disconnecting link 211 is controlled to be closed and the third disconnecting link 231 is controlled to be opened, so that the alternating current field enters the out-of-string running state.
The converter transformer 10 and the first power line 21 are controlled to be electrically connected to the second bus 50, that is, the first intermediate switch 312 and the second side switch 313 are controlled to be closed, the first side switch 311, the third side switch 321, the second intermediate switch 322 and the fourth side switch 323 are controlled to be opened, and the first knife switch 211 is controlled to be closed, the second knife switch 221 is controlled to be opened and the third knife switch 231 is controlled to be opened, so that the converter transformer 10 and the first power line 21 are electrically connected to the second bus 50; when the second bus 50 needs to be overhauled, the second side switch 313 is controlled to be opened, and the first intermediate switch 312 is kept closed, so that the alternating current field enters the out-of-string running state.
The converter transformer 10 and the second power line 22 are controlled to be electrically connected to the second bus 50, that is, the second side switch 313, the second middle switch 322 and the fourth side switch 323 are controlled to be closed, the first side switch 311, the first middle switch 312 and the third side switch 321 are controlled to be opened, and the second knife switch 221 is controlled to be closed, the first knife switch 211 is controlled to be opened and the third knife switch 231 is controlled to be opened, so that the converter transformer 10 and the second power line 22 are electrically connected to the second bus 50; at this time, when the second bus 50 needs to be overhauled, the second side switch 313, the second intermediate switch 322 and the fourth side switch 323 are all controlled to be opened, the first intermediate switch 312 is controlled to be closed, the first knife switch 211 is controlled to be closed, and the second knife switch 221 is controlled to be opened, so that the alternating current field enters a string-out operation state.
The converter transformer 10 and the third power supply line 23 are controlled to be electrically connected to the second bus 50, that is, the second side switch 313 and the fourth side switch 323 are controlled to be closed; the first side switch 311, the first middle switch 312, the third side switch 321 and the second middle switch 322 are controlled to be opened, and the first disconnecting link 211 is controlled to be opened, the second disconnecting link 221 is controlled to be opened and the third disconnecting link 231 is controlled to be closed, so that the converter transformer 10 and the third power supply line 23 are electrically connected to the second bus bar 50; at this time, when the second bus 50 needs to be overhauled, the second side switch 313 and the fourth side switch 323 are controlled to be opened, the first intermediate switch 312 is controlled to be closed, the first disconnecting link 211 is controlled to be closed, and the third disconnecting link 231 is controlled to be opened, so that the alternating current field enters a string outlet running state.
It is understood that the present embodiment is not limited to the specific manner in which the converter transformer 10 and the at least one power line 20 are electrically connected to the first bus 40 or the second bus 50, nor is the specific manner in which the ac field is controlled to enter the out-of-string operating state based on the converter transformer 10 and the at least one power line 20 being electrically connected to the first bus 40 or the second bus 50.
An embodiment of the present invention further provides an ac field outlet serial operation system of a flexible dc power transmission system, fig. 3 is an ac field outlet serial operation system of a flexible dc power transmission system provided in an embodiment of the present invention, and as shown in fig. 3, the system includes a controller 01 and an ac field connection system 02; the controller 01 is electrically connected with the breaker group 20 and the disconnecting link in the alternating current field wiring system 02; the controller 01 is configured to execute the ac field outlet serial operation method of the flexible dc power transmission system provided in the foregoing embodiment; since the ac field outlet serial operation system of the flexible ac-dc power transmission system includes the controller 01, the beneficial effects of the above embodiments are also achieved, and details are not described here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An alternating current field outlet string operation method of a flexible direct current transmission system is characterized by being applied to an alternating current field wiring system of the flexible direct current transmission system, wherein the alternating current field wiring system comprises a converter transformer, at least one power circuit, at least one breaker group, a first bus and a second bus;
at least one breaker group comprises a first breaker group and a second breaker group; the first circuit breaker group comprises a first side switch, a first middle switch and a second side switch; the second circuit breaker group comprises a third side switch, a second middle switch and a fourth side switch; the first side switch and the third side switch are both electrically connected with the first bus; the second side switch and the fourth side switch are both electrically connected with the second bus; the first side switch is electrically connected with the second side switch through the first intermediate switch; the third side switch is electrically connected with the fourth side switch through the second middle switch;
the at least one power supply circuit comprises a first power supply circuit, a second power supply circuit and a third power supply circuit; each power circuit comprises a knife switch; the converter transformer is electrically connected with the second end of the first intermediate switch; the first power supply line is electrically connected with a first end of the first intermediate switch; the second power supply line is electrically connected with the second end of the second intermediate switch, and the third power supply line is electrically connected with the first end of the second intermediate switch;
the alternating current field outlet operation method comprises the following steps:
controlling the on-off of the breaker group and the disconnecting link so as to electrically connect the converter transformer and at least one power line to the first bus or the second bus;
judging whether the first bus or the second bus needs to be overhauled;
and when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state.
2. The ac farm out-of-string operation method of the flexible dc power transmission system of claim 1, wherein the first power line comprises a first disconnecting link; the second power supply line comprises a second knife switch; the third power supply line comprises a third knife switch;
controlling the switch of the breaker group and the knife switch to electrically connect the converter transformer and at least one power line to the first bus or the second bus, comprising:
controlling the first side switch and the first intermediate switch to be closed, controlling the second side switch, the third side switch, the second intermediate switch and the fourth side switch to be opened, and controlling the first knife switch to be closed, the second knife switch and the third knife switch to be opened so that the converter transformer and the first power supply circuit are electrically connected to the first bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
and when the first bus needs to be overhauled, the first side switch is controlled to be switched off, and the first middle switch is kept to be switched on.
3. The ac farm out-of-string operation method for the flexible dc power transmission system according to claim 2, wherein controlling the opening and closing of the breaker group and the disconnecting link to electrically connect the converter transformer to at least one of the power line and the first bus bar, comprises:
controlling the first side switch, the first middle switch and the third side switch to be closed, controlling the second side switch, the second middle switch and the fourth side switch to be opened, and controlling the first knife switch to be opened, the second knife switch to be closed and the third knife switch to be opened so that the converter transformer and the second power supply circuit are electrically connected to the first bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
when the first bus needs to be overhauled, the first side switch and the third side switch are controlled to be disconnected, the first knife switch is controlled to be closed, the second knife switch is controlled to be disconnected, and the first middle switch is kept closed.
4. The ac farm out-of-string operation method for the flexible dc power transmission system according to claim 2, wherein controlling the opening and closing of the breaker group and the disconnecting link to electrically connect the converter transformer to at least one of the power line and the first bus bar, comprises:
controlling the first side switch, the first middle switch, the third side switch and the second middle switch to be closed, controlling the second side switch and the fourth side switch to be opened, and controlling the first knife switch to be opened, the second knife switch to be opened and the third knife switch to be closed so that the converter transformer and the third power supply circuit are electrically connected to the first bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
when the first bus needs to be overhauled, the first edge switch, the third edge switch and the second middle switch are controlled to be disconnected, and the first disconnecting link is controlled to be closed and the third disconnecting link is controlled to be disconnected.
5. The ac farm out-of-string operation method for the flexible dc power transmission system according to claim 2, wherein controlling the opening and closing of the breaker group and the disconnecting link to electrically connect the converter transformer to at least one of the power line and the first bus bar, comprises:
controlling the first intermediate switch and the second edge switch to be closed, controlling the first edge switch, the third edge switch, the second intermediate switch and the fourth edge switch to be opened, and controlling the first knife switch to be closed, the second knife switch to be opened and the third knife switch to be opened so that the converter transformer and the first power supply circuit are electrically connected to the second bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
and when the second bus needs to be overhauled, controlling the second side switch to be switched on and off, and keeping the first middle switch closed.
6. The ac farm out-of-string operation method for the flexible dc power transmission system according to claim 2, wherein controlling the opening and closing of the breaker group and the disconnecting link to electrically connect the converter transformer to at least one of the power line and the first bus bar, comprises:
controlling the second side switch, the second intermediate switch and the fourth side switch to be closed, controlling the first side switch, the first intermediate switch and the third side switch to be opened, and controlling the second disconnecting link to be closed, the first disconnecting link to be opened and the third disconnecting link to be opened so that the converter transformer and the second power supply circuit are electrically connected to the second bus;
when the first bus or the second bus needs to be overhauled, controlling the alternating current field to enter a string-out running state, including:
when the second bus needs to be overhauled, the second side switch, the second middle switch and the fourth side switch are controlled to be both disconnected, the first middle switch is controlled to be closed, the first knife switch is controlled to be closed, and the second knife switch is controlled to be disconnected.
7. The ac farm out-of-string operation method for the flexible dc power transmission system according to claim 2, wherein controlling the opening and closing of the breaker group and the disconnecting link to electrically connect the converter transformer to at least one of the power line and the first bus bar, comprises:
controlling the second side switch and the fourth side switch to be closed; the first side switch, the first middle switch, the third side switch and the second middle switch are controlled to be switched off, and the first disconnecting link, the second disconnecting link and the third disconnecting link are controlled to be switched on so that the converter transformer and the third power supply circuit are electrically connected to the second bus;
when the first bus or the second bus needs to be overhauled, the alternating current field is controlled to enter a string-out running state, and the method comprises the following steps:
when the second bus needs to be overhauled, the second side switch and the fourth side switch are controlled to be both disconnected, the first middle switch is controlled to be closed, and the first disconnecting link is controlled to be closed and the third disconnecting link is controlled to be disconnected.
8. The method of ac field out-of-string operation of a flexible dc power transmission system of claim 1, wherein identifying whether the first bus or the second bus needs servicing comprises:
acquiring the temperature of the first bus or the second bus measured by an infrared thermometer;
and identifying whether the first bus or the second bus needs to be overhauled or not according to the temperature of the first bus or the second bus.
9. The AC field outlet operation method of a flexible DC power transmission system according to claim 8,
identifying whether the first bus or the second bus needs to be overhauled according to the temperature of the first bus or the second bus, including:
and when the temperature of the first bus or the second bus is higher than the preset temperature, the first bus or the second bus needs to be overhauled.
10. An AC field string outlet operation system of a flexible DC power transmission system comprises a controller and an AC field wiring system; the controller for performing the ac farm out-of-string operation method of the flexible dc power transmission system according to any of the preceding claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210096116.4A CN114498721A (en) | 2022-01-26 | 2022-01-26 | AC field out-of-string operation method and system of flexible DC power transmission system |
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| CN202210096116.4A CN114498721A (en) | 2022-01-26 | 2022-01-26 | AC field out-of-string operation method and system of flexible DC power transmission system |
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