CN114400696A - Sequential control method and system for back-to-back direct current transmission system - Google Patents
Sequential control method and system for back-to-back direct current transmission system Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to the field of power electronics, in particular to a sequential control method and a sequential control system for a back-to-back direct current transmission system. The invention provides multiple sequential control operation modes of a back-to-back direct current transmission system, which can meet the requirement of efficiently operating equipment in a converter station under various working conditions, reduce the operation load of operators, reduce the misoperation risk and improve the safety and stability of back-to-back direct current operation.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a sequential control method and a sequential control system for a back-to-back direct current transmission system.
Background
The main purpose of the sequential control of the converter station is to ensure that a direct current transmission system can be started and stopped stably and safely, reliably operate a circuit breaker, an isolation disconnecting link and a grounding disconnecting link, and safely and reliably switch a control mode and an operation mode.
The state of the direct current transmission system is clearly defined by the power grid company, and if the southern power grid company regulates the direct current transmission system to have five sequence control states: a service state, a cold standby state, an ac side hot standby state, a hot standby state, and an operating state. The corresponding isolation disconnecting link and disconnecting link states of each sequential control state are different, when one sequential control state is switched to the other sequential control state, a plurality of switches and disconnecting links need to be operated, particularly, a back-to-back direct current transmission system is adopted, two sides of a direct current unit of the system are in the same converter station, dozens of disconnecting links may even need to be operated when the sequential control state is switched, if each disconnecting link is manually operated, the operation load and the intensity of converter station operators are huge, the operation efficiency is low, time is consumed, and the artificial risk of operation errors is very easy to exist.
A sequential control method for a back-to-back direct current transmission system, which can provide multiple sequential control operation modes for a converter station, is needed, so that the requirement of efficiently operating equipment in the converter station under various working conditions is met, the operation load of operators is reduced, the misoperation risk is reduced, and the safety and stability of back-to-back direct current operation are improved.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a sequential control method and a sequential control system for a back-to-back direct current transmission system, which can meet the requirement of efficiently operating equipment in a converter station under various working conditions, reduce the operation load of operators, reduce the misoperation risk and improve the safety and stability of back-to-back direct current operation.
The invention aims to provide a sequential control method of a back-to-back direct-current power transmission system.
A second object of the present invention is to provide a sequential control system for a back-to-back dc power transmission system.
The first purpose of the invention can be achieved by adopting the following technical scheme:
a sequential control method for a back-to-back dc power transmission system, the method comprising:
according to the actual working condition of the back-to-back direct-current power transmission system, a sequential control automatic bilateral independent control mode, a sequential control automatic bilateral coordination control mode and a sequential control manual mode are configured, so that the back-to-back direct-current power transmission system is controlled;
the method comprises the following steps that a following control automatic bilateral independent control mode is adopted, only the left side of a back-to-back direct current unit or the right side of the back-to-back direct current unit is subjected to following control state switching, whether the state of primary equipment and the state of secondary equipment related to the left side of the direct current unit or the right side of the direct current unit meet preset conditions or not is judged, when the preset conditions are met, a following control state switching operation instruction is sent out through an SCADA system, and the back-to-back direct current control system executes the following control state switching operation instruction, so that the left side of the direct current unit or the right side of the direct current unit is switched into the following control state; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control automatic bilateral coordination control mode is used for simultaneously switching sequential control states of the left side and the right side of the back-to-back direct current unit, firstly judging whether the states of primary equipment and secondary equipment related to the left side and the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sending a sequential control state switching operation instruction through an SCADA system, and executing the sequential control state switching operation instruction by the back-to-back direct current control system to enable the left side and the right side of the direct current unit to be switched into the sequential control states; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
in the forward control manual mode, the state of a single switch or a knife switch in the left side and the right side of the back-to-back direct current unit is switched, whether the switch or the knife switch meets the interlocking condition of switching off or switching on is judged firstly, when the interlocking condition is met, a control operation instruction for switching the state of the switch or the knife switch is sent out through an SCADA system, and a back-to-back direct current control system executes the control operation instruction to realize the switching off or switching on operation of the switch or the knife switch; and when the interlocking condition is not met, the SCADA system is prohibited from sending out a control operation instruction for switching the states of the switch or the disconnecting link.
Preferably, the performing of the sequential control state switching specifically includes: the maintenance state is switched to a cold standby state, the cold standby state is switched to a current side hot standby state, the alternating current side hot standby state is switched to a hot standby state, the hot standby state is switched to an operation state, the operation state is switched to a hot standby state, the hot standby state is switched to the alternating current side hot standby state, the alternating current side hot standby state is switched to the cold standby state, and the cold standby state is switched to the maintenance state.
The second purpose of the invention can be achieved by adopting the following technical scheme:
a sequential control system for a back-to-back dc power transmission system, the system comprising:
the sequential control automatic bilateral independent control module only switches the sequential control state of the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit, firstly judges whether the state of primary equipment and the state of secondary equipment related to the left side of the direct current unit or the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sends out a sequential control state switching operation instruction through an SCADA system, and the back-to-back direct current control system executes the sequential control state switching operation instruction to enable the left side of the direct current unit or the right side of the direct current unit to switch the sequential control state; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control automatic bilateral coordination control module is used for simultaneously switching sequential control states of the left side and the right side of the back-to-back direct current unit, judging whether the states of primary equipment and secondary equipment related to the left side and the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sending a sequential control state switching operation instruction through an SCADA system, and executing the sequential control state switching operation instruction by the back-to-back direct current control system to enable the left side and the right side of the direct current unit to be switched into the sequential control states; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control manual module switches the state of a single switch or a knife switch in the left side and the right side of the back-to-back direct current unit, judges whether the switch or the knife switch meets the interlocking condition of switching off or switching on, sends a control operation instruction of switching off or switching on the state through the SCADA system when the interlocking condition is met, and executes the control operation instruction by the back-to-back direct current control system to realize the switching off or switching on the switch or the knife switch; and when the interlocking condition is not met, the SCADA system is prohibited from sending out a control operation instruction for switching the states of the switch or the disconnecting link.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention provides a sequential control method and a sequential control system for a back-to-back direct current transmission system, wherein different modes or mode combinations can be selected under different working conditions by configuring a sequential control mode which provides a sequential control automatic bilateral independent control mode, a sequential control automatic bilateral coordination control mode and a sequential control manual mode, and various sequential control states of the back-to-back direct current transmission system are effectively switched.
2. The invention realizes sequential control of the back-to-back direct current transmission system by providing multiple sequential control operation modes of the back-to-back direct current transmission system, can meet the requirement of efficiently operating equipment in the converter station under various working conditions, lightens the operation load of operators, reduces the misoperation risk and improves the safety and stability of back-to-back direct current operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of sequential state switching of a back-to-back dc power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a back-to-back dc power transmission system topology according to an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to the accompanying drawings and examples, and it is obvious that the described examples are some, but not all, examples of the present invention, and the embodiments of the present invention are not limited thereto. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
According to the sequential control method of the back-to-back direct current transmission system, a sequential control automatic bilateral independent control mode, a sequential control automatic bilateral coordination control mode and a sequential control manual mode are configured according to the actual working condition of the back-to-back direct current transmission system, different modes or mode combinations can be selected under different working conditions, various sequential control states of the back-to-back direct current transmission system are effectively switched, and sequential control of the back-to-back direct current transmission system is realized; wherein:
the method comprises the following steps that a sequential Control automatic bilateral independent Control mode is adopted, sequential Control state switching is only carried out on the left side of a back-to-back direct current unit or the right side of the back-to-back direct current unit, whether the state of primary equipment And the state of secondary equipment related to the left side of the direct current unit or the right side of the direct current unit meet preset conditions or not is judged, when the preset conditions are met, a sequential Control state switching operation instruction is sent out through an SCADA (Supervisory Control And Data Acquisition) system, And the back-to-back direct current Control system executes the sequential Control state switching operation instruction, so that the left side of the direct current unit or the right side of the direct current unit is switched into a sequential Control state; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the primary equipment comprises a circuit breaker (switch), an isolation disconnecting link, a grounding disconnecting link, a converter transformer, a converter valve and a cooling system thereof, and the secondary equipment comprises a pole control protection system, a valve control protection system and an auxiliary system.
As shown in fig. 1, in this embodiment, the back-to-back dc power transmission system includes five sequential control states: the inspection state, the cold standby state, the alternating current side hot standby state, the hot standby state and the running state, and the sequential control state switching comprises the following steps: the maintenance state is switched to a cold standby state, the cold standby state is switched to a current side hot standby state, the alternating current side hot standby state is switched to a hot standby state, the hot standby state is switched to an operation state, the operation state is switched to a hot standby state, the hot standby state is switched to the alternating current side hot standby state, the alternating current side hot standby state is switched to the cold standby state, and the cold standby state is switched to the maintenance state.
As shown in fig. 2, according to the prior art, the overhaul state of the back-to-back dc power transmission system is defined, all the grounding switches on the local side of the back-to-back dc units are in the closed position, the grounding switch Q51, the grounding switch Q52 and the grounding switch Q53 in the 1T11 area/2T 11 area are in the closed position, the grounding switch Q51, the grounding switch Q52 and the grounding switch Q53 in the 1B10/2B10 area are in the closed position, the grounding switch Q51, the grounding switch Q52, the grounding switch Q53, the grounding switch Q54, the grounding switch Q55 and the grounding switch Q56 are in the closed position in the 1B11/2B11 area; all the grounding disconnecting switches are separated in the cold standby state, namely a grounding disconnecting switch Q51, a grounding disconnecting switch Q52 and a grounding disconnecting switch Q53 in a 1T11/2T11 region are separated, a grounding disconnecting switch Q51, a grounding disconnecting switch Q52 and a grounding disconnecting switch Q53 in a 1B10/2B10 region are separated, and a grounding disconnecting switch Q51, a grounding disconnecting switch Q52, a grounding disconnecting switch Q53, a grounding disconnecting switch Q54, a grounding disconnecting switch Q55 and a grounding disconnecting switch Q56 in a 1B11/2B11 region are separated; the isolation disconnecting link on the alternating current side is closed under the standby state on the alternating current side, namely the isolation disconnecting link Q2 and the isolation disconnecting link Q6 in the 1T11/2T11 area are closed, and the isolation disconnecting link Q1 and the isolation disconnecting link Q2 in the 1B10/2B10 area are closed; in a hot standby state, a switch Q0 in a 1T11/2T11 area is closed, a switch Q91 in a 1B10/2B10 area is closed, and an isolation knife switch Q1 and an isolation knife switch Q2 in a 1B11/2B11 area are closed; in the operating state, the isolation knife switch Q90 in the area 1B10/2B10 is closed, and the converter valve is unlocked.
Specifically, the following sequential control state switching is performed on the left side of the back-to-back direct current unit or the right side of the direct current unit in the sequential control automatic bilateral independent control mode:
the maintenance state is switched to a cold standby state, the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit is switched to the cold standby state from the maintenance state, all grounding disconnecting links are required to be remotely controlled from a switching-on state to a switching-off state, whether all the grounding disconnecting links meet the interlocking condition of switching-off is judged firstly, when the interlocking condition is met, a cold standby sequential control operation instruction is sent out through an SCADA system, and the back-to-back direct current control system automatically switches off all the grounding disconnecting links on the local side.
The interlocking condition is based on electrical interlocking and specifically comprises the following steps:
1. when the breaker, the load switch and the contactor are in a closing state, the isolation knife switch can not be operated, and the isolation knife switch is prevented from being switched on and off under the condition of load.
2. The operation instruction can be executed on the operated equipment only if the operation instruction corresponds to the operating equipment, so that the circuit breaker, the load switch and the contactor are prevented from being switched on and off by mistake.
3. Only when the grounding disconnecting link is in a disconnecting state, the isolating disconnecting link or the handcart can be switched on to reach the working position, and the circuit breaker and the load switch can be operated to be closed. And the circuit breaker and the load switch are prevented from being opened and closed when the grounding switch is in a closed position.
4. Only in the opening state of the circuit breaker, the isolation disconnecting link or the handcart can be operated to retreat from the working position to the testing position, and the grounding switch can be closed. Prevent the false closing of the grounding knife switch when electrified.
In this embodiment, the repair state switches the cold standby state and divides this side switch order automatically: B10Q52 → B10Q53 → B10Q54 → B10Q55 → B10Q51 → B11Q55 → B11Q56 → B11Q51 → B11Q52 → B11Q53 → B11Q54 → T11Q 53.
The cold standby state is switched to the alternating current side hot standby state, the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit is switched to the alternating current side hot standby state from the cold standby state, whether the related disconnecting link meets the interlocking condition of switching on or not is judged, when the interlocking condition is met, an alternating current side hot standby sequential control operation instruction is sent out through the SCADA system, and the back-to-back direct current control system automatically switches on the related isolating disconnecting link of the current side.
In this embodiment, switching the ac side hot standby state from the cold standby state to the back-to-back dc unit left side or the back-to-back dc unit right side requires remote control of the dc unit own side T11 zones Q2, Q6 and B10 zones Q1, Q2 to the closed state. The cold standby state switching AC side hot standby state automatically closes the own side disconnecting switch sequence T11Q2 → T11Q6 → B10Q1 → B10Q 2.
The method comprises the steps that the hot standby state is switched through the alternating current side hot standby state, the left side of a back-to-back direct current unit or the right side of the back-to-back direct current unit is switched to the hot standby state from the alternating current side hot standby state, whether a relevant switch and an isolation disconnecting link meet the interlocking condition of switching-on or not is judged firstly, when the interlocking condition is met, a command for executing sequential control operation is sent out through an SCADA system, and the back-to-back direct current control system automatically switches on the relevant switch and the isolation disconnecting link.
In this embodiment, switching the hot standby state from the ac side hot standby state to the back-to-back dc unit left side or the back-to-back dc unit right side requires remote control of the dc unit home side B11 zones Q1, Q2, B10 zone Q91, T11 zone Q0 to the closed state. The alternating-current side standby state switching hot standby state automatically closes the side isolation switch sequence of B11Q2 → B11Q1 → B10Q91 → T11Q 0.
And switching the operation state of the hot standby state, switching the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit from the hot standby state to the operation state, unlocking the converter valve at the side, judging whether the converter valve at the side meets the unlocking condition or not, sending an operation sequential control operation instruction through the SCADA system when the unlocking locking condition is met, and automatically unlocking the converter valve at the side of the direct current unit by the back-to-back direct current control system.
The unlocking conditions include that all primary equipment and secondary equipment in the station are normal, and the direct current control and operation mode is normal.
The operation state is switched to a hot standby state, the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit is switched to the hot standby state from the operation state, the converter valves on two sides need to be locked, whether the converter valves on two sides meet the locking condition is judged firstly, when the locking condition is met, a sequential control operation instruction is sent out through the SCADA system, and the converter valves on two sides of the direct current unit are automatically locked by the back-to-back direct current control system.
The locking interlocking condition is that the direct current active power and the reactive power are low, and locking can be achieved.
The hot standby state is switched to the alternating current side hot standby state, the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit is switched to the alternating current side hot standby state from the hot standby state, whether the related switch and the isolation disconnecting link meet the interlocking condition of disconnecting is judged firstly, when the interlocking condition is met, a command for executing sequential control operation is sent out through the SCADA system, and the back-to-back direct current control system automatically disconnects the related switch and the isolation disconnecting link.
In this embodiment, switching the ac side hot standby state from the hot standby state to the back-to-back dc unit left side or the back-to-back dc unit right side requires remote control of the dc unit home side T11 region Q0, B10 region Q91, B11 region Q1 and Q2 to the open state. The hot standby state switching AC side hot standby state automatic division switch and isolation switch sequence is T11Q0 → B10Q91 → B11Q1 → B11Q2 → B10Q 90.
The method comprises the steps that the cold standby state is switched from the alternating current side hot standby state to the cold standby state, the left side of a back-to-back direct current unit or the right side of the back-to-back direct current unit is switched from the alternating current side hot standby state to the cold standby state, whether a related isolation disconnecting link meets the interlocking condition of disconnecting is judged firstly, when the interlocking condition is met, a cold standby sequential control operation instruction is sent out through an SCADA system, and the back-to-back direct current control system automatically disconnects the related isolation disconnecting link.
In this embodiment, switching the back-to-back dc unit left side or the back-to-back dc unit right side from the ac side hot standby state to the cold standby state requires remote control of the local side T11 zones Q2, Q6 and B10 zones Q1, Q2 to the open state. The alternating-current side standby state switching cold standby state automatic dividing main side isolation switch sequence is B10Q2 → B10Q1 → T11Q2 → T11Q 6.
The method comprises the steps that a cold standby state is switched to an overhaul state, the left side of a back-to-back direct current unit or the right side of the back-to-back direct current unit is switched to the overhaul state from the cold standby state, all grounding disconnecting links of the whole direct current unit are required to be remotely controlled from a disconnecting state to a closing state, whether all the grounding disconnecting links meet the interlocking condition of closing or not is judged firstly, when the interlocking condition is met, an overhaul sequential control operation instruction is sent out through an SCADA (supervisory control and data acquisition) system, and all the grounding disconnecting links on the local side are automatically closed through a back-to-back direct current control system.
In this embodiment, the cold standby state switches the automatic switch order of this side of closing of maintenance state: T11Q53 → B11Q54 → B11Q53 → B11Q52 → B11Q51 → B11Q56 → B11Q55 → B10Q51 → B10Q55 → B10Q54 → B10Q53 → B10Q 52.
In the sequential control automatic dual-side independent control mode, the above-mentioned various sequential control state transitions are automatically operated only on one side, and the other side does not execute the sequential control command at the same time.
The sequential control automatic bilateral coordination control mode is characterized in that sequential control states of the left side and the right side of a back-to-back direct current unit are switched simultaneously, whether the states of primary equipment and secondary equipment related to the left side and the right side of the direct current unit meet preset conditions or not is judged, when the preset conditions are met, a sequential control state switching operation instruction is sent out through an SCADA system, and the back-to-back direct current control system executes the sequential control state switching operation instruction, so that the left side and the right side of the direct current unit are switched to the sequential control states; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the interlocking condition in the sequential control automatic double-side coordination control mode is the same as the interlocking condition defined in the sequential control automatic double-side independent control mode.
In the sequential control automatic bilateral coordination control mode, the sequential control state switching of the left side and the right side of the back-to-back direct current unit specifically comprises the following sequential control state switching:
the maintenance state is switched to a cold standby state, the left side and the right side of the direct current unit are required to be switched to the cold standby state from the maintenance state, all grounding disconnecting switches of the whole direct current unit are remotely controlled to be in a disconnecting state from a closing state, whether all the grounding disconnecting switches meet the interlocking condition of disconnecting is judged firstly, when the interlocking condition is met, a cold standby sequential control operation instruction is sent out through an SCADA system, and a back-to-back direct current control system automatically disconnects all the grounding disconnecting switches on the two sides.
In this embodiment, the maintenance state switches the cold standby state and simultaneously divides the two-side disconnecting link sequence automatically: B10Q52 → B10Q53 → B10Q54 → B10Q55 → B10Q51 → B11Q55 → B11Q56 → B11Q51 → B11Q52 → B11Q53 → B11Q54 → T11Q 53.
The method comprises the steps that a cold standby state is switched to a current side hot standby state, the left side and the right side of a direct current unit are switched to an alternating current side hot standby state from the cold standby state, whether related isolation switches meet interlocking conditions of switching-on or not is judged firstly, when the interlocking conditions are met, an alternating current side hot standby sequential control operation instruction is sent out through an SCADA system, and the related isolation switches are automatically switched by a back-to-back direct current control system.
In this embodiment, switching the ac side hot standby state from the cold standby state on both the right and left sides of the dc unit requires remote control of the dc unit sides 1T11/2T11 zones Q2, Q6 and 1B10/2B10 zones Q1, Q2 to the closed state. The cold standby state switches the AC side hot standby state and automatically closes the two side disconnecting switch sequence of T11Q2 → T11Q6 → B10Q1 → B10Q 2.
The method comprises the steps that an alternating current side standby state is switched to a hot standby state, the left side and the right side of a direct current unit are switched to the hot standby state from the alternating current side standby state, whether related switches and isolation switches meet interlocking conditions of switching-on or not is judged, when the interlocking conditions are met, a sequential control execution operation instruction is sent out through an SCADA system, and the back-to-back direct current control system automatically switches on the related switches and the isolation switches.
In the present embodiment, in the double-side cooperative control mode in the sequential control automatic mode, both the left and right sides of the dc unit are switched from the ac-side hot standby state to the hot standby state, and it is necessary to remotely control the regions Q1, Q91, Q2, and Q0 in the 1B11/2B11, 1B10/2B10 regions Q91, and 1T11/2T11 regions Q0 on both sides of the dc unit to the closed state. The alternating current side hot standby state switches the hot standby state and automatically closes the two-side switch and the isolation switch in the sequence of B11Q2 → B11Q1 → B10Q91 → T11Q 0.
The method comprises the steps that the operation state is switched in a hot standby state, the left side and the right side of a direct current unit are switched in an operation state from the hot standby state, the left side and the right side of the direct current unit need to be switched in the operation state from the hot standby state, converter valves on the two sides need to be unlocked, whether the converter valves on the two sides meet interlocking conditions or not is judged firstly, when the interlocking conditions are met, an operation sequential control operation instruction is sent out through an SCADA system, and the converter valves on the two sides of the direct current unit are automatically unlocked through a back-to-back direct current control system. The DC voltage side converter is unlocked first, and then the active power side converter is unlocked.
The operation state is switched to a hot standby state, the left side and the right side of the direct current unit are switched to the hot standby state from the operation state, the converter valves on the two sides need to be locked, whether the converter valves on the two sides meet the locking condition is judged firstly, when the locking condition is met, a sequential control operation instruction is sent out through the SCADA system, and the converter valves on the two sides of the direct current unit are automatically locked by the back-to-back direct current control system. The fixed active power side converter is locked, and then the fixed direct current voltage side converter is locked.
The hot standby state is switched to the hot standby state at the side of the alternating current, the left side and the right side of the direct current unit are switched to the hot standby state at the side of the alternating current, whether related switches and isolation switches meet the interlocking condition of switching-off is judged, when the interlocking condition is met, a command for executing sequential control operation is sent out through an SCADA system, and the back-to-back direct current control system automatically switches off the related switches and the isolation switches.
In this embodiment, in the double-side coordinated control mode in the sequential control automatic mode, both the left and right sides of the dc unit are switched from the hot standby state to the ac-side hot standby state, and it is necessary to remotely control the areas Q0, Q1, Q21B 5639/2B 11, Q91, and Q90 on both sides of the dc unit to the open state. The hot standby state is switched to the AC side hot standby state, and the two-side switch and the isolation knife switch are automatically separated in sequence, namely T11Q0 → B10Q91 → B11Q1 → B11Q2 → B10Q 90.
The method comprises the steps of switching an alternating-current side standby state to a cold standby state, switching the left side and the right side of a direct-current unit to the cold standby state from the alternating-current side standby state, judging whether a related isolation disconnecting link meets an interlocking condition of disconnecting, sending a cold standby sequential control operation instruction through an SCADA system when the interlocking condition is met, and automatically disconnecting the related disconnecting link through a back-to-back direct-current control system.
In this embodiment, in the double-side coordination control mode in the sequential control automatic mode, both the left and right sides of the dc unit are switched from the ac-side hot standby state to the cold standby state, and it is necessary to remotely control the areas Q2 and Q6 and Q2 in the 1T11/2T11 areas Q2 and Q6 and 1B10/2B10 areas Q1 and Q2 on both sides of the dc unit to the open state. The AC side hot standby state switches to the cold standby state while automatically separating the two-side disconnecting switch sequence of B10Q2 → B10Q1 → T11Q2 → T11Q 6.
The method comprises the steps that a cold standby state is switched to an overhaul state, the left side and the right side of a direct current unit are switched to the overhaul state from the cold standby state, all grounding disconnecting links of the whole direct current unit are required to be remotely controlled from a disconnecting state to a closing state, whether all the grounding disconnecting links meet interlocking conditions of closing or not is judged firstly, when the interlocking conditions are met, an overhaul sequential control operation instruction is sent out through an SCADA system, and a back-to-back direct current control system automatically closes the grounding disconnecting links related to the two sides.
In this embodiment, cold standby state switches the maintenance state and closes both sides switch order automatically simultaneously: T11Q53 → B11Q54 → B11Q53 → B11Q52 → B11Q51 → B11Q56 → B11Q55 → B10Q51 → B10Q55 → B10Q54 → B10Q53 → B10Q 52.
In the forward control manual mode, the state of a single switch or an isolation switch in the left side and the right side of the back-to-back direct current unit is switched, whether the switch or the isolation switch meets an interlocking condition is judged firstly, when the interlocking condition is met, an operation instruction for switching the state of the switch or the isolation switch is sent out through an SCADA system, and a back-to-back direct current control system executes a control operation instruction, so that the state of the single switch or the isolation switch is switched; and when the interlocking condition is not met, the SCADA system is prohibited from sending out a control operation instruction for switching the states of the switch or the isolation switch.
The switch comprises a breaker and a load switch, and the disconnecting link comprises an isolation disconnecting link and a grounding disconnecting link.
In the present embodiment, a grounding switch will be described by taking a remote-controlled switch-on 1B10Q54 as an example. The grounding knife switch 1B10Q54 meets the condition of closing interlocking (the basic condition is electrical interlocking), namely, the isolation knife switches 1B10Q1 and 1B10Q2 are both in open position, and when the grounding knife switch 1B10Q54 meets the interlocking condition, the grounding knife switch is operated and closed remotely in a SCADA system. The same mode is adopted when other isolation disconnecting links are independently switched on and switched off, and the isolation disconnecting link can be remotely controlled after the isolation disconnecting link meets the electrical interlocking condition.
The sequential control manual mode can be switched to a sequential control automatic double-side independent control mode, and the sequential control automatic double-side independent control mode is switched to the sequential control automatic double-side coordinated control mode to meet the condition that sequential control states of two sides are consistent, namely the sequential control states of two sides of the back-to-back direct current unit are simultaneously in a maintenance state, a cold standby state, an alternating current side hot standby state, a hot standby state or an operation state, and the sequential control automatic double-side coordinated control mode is allowed to be put into.
When one side of the back-to-back direct current unit adopts a sequential control manual mode, the other side of the back-to-back direct current unit can adopt a sequential control manual mode or a sequential control automatic double-side independent mode; a sequential control automatic bilateral independent mode is adopted on one side of the back-to-back direct current unit, and a sequential control manual mode or a sequential control automatic bilateral independent mode can be adopted on the other side of the back-to-back direct current unit; a sequential control automatic bilateral coordination mode is adopted on one side of the back-to-back direct current unit, and a sequential control automatic bilateral coordination mode is adopted on the other side of the direct current unit. The different mode combinations on both sides of the back-to-back dc system are shown in table 1:
TABLE 1
In summary, the sequence control automatic bilateral independent control mode, the sequence control automatic bilateral coordination control mode and the sequence control manual mode in the sequence control method for the back-to-back direct current power transmission system provided by the invention can be combined in different modes according to the actual working conditions of the back-to-back direct current power transmission system, so that the requirement of efficiently operating equipment in the converter station under various working conditions can be effectively met, the operation load of operators is reduced, the misoperation risk is reduced, and the safety and the stability of the operation of the back-to-back direct current power transmission system are improved.
Example 2
The embodiment provides a sequential control system of a back-to-back direct current transmission system, which comprises a sequential control automatic bilateral independent control module, a sequential control automatic bilateral coordination control module and a sequential control manual module, wherein the functions of the modules are as follows:
the sequential control automatic bilateral independent control module only switches the sequential control state of the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit, firstly judges whether the state of primary equipment and the state of secondary equipment related to the left side of the direct current unit or the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sends out a sequential control state switching operation instruction through an SCADA system, and the back-to-back direct current control system executes the sequential control state switching operation instruction to enable the left side of the direct current unit or the right side of the direct current unit to switch the sequential control state; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control automatic bilateral coordination control module is used for simultaneously switching sequential control states of the left side and the right side of the back-to-back direct current unit, judging whether the states of primary equipment and secondary equipment related to the left side and the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sending a sequential control state switching operation instruction through an SCADA system, and executing the sequential control state switching operation instruction by the back-to-back direct current control system to enable the left side and the right side of the direct current unit to be switched into the sequential control states; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control manual module is used for switching the states of a single switch or an isolation disconnecting link in the left side and the right side of the back-to-back direct current unit, firstly judging whether the switch or the isolation disconnecting link meets the interlocking condition of switching off or switching on, when the interlocking condition is met, sending a control operation instruction for switching the states of the switch or the isolation disconnecting link through the SCADA system, and executing the control operation instruction by the back-to-back direct current control system to realize the switching off or switching on operation of the switch or the isolation disconnecting link; and when the interlocking condition is not met, the SCADA system is prohibited from sending out a control operation instruction for switching the states of the switch or the isolation switch.
The primary equipment comprises a circuit breaker, an isolation disconnecting link, a grounding disconnecting link, a converter transformer, a converter valve and a cooling system, and the secondary equipment comprises a pole control protection system, a valve control protection system and an auxiliary system.
The switch comprises a breaker and a load switch, and the disconnecting link comprises an isolation disconnecting link and a grounding disconnecting link.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A sequential control method of a back-to-back direct current transmission system is characterized in that a sequential control automatic bilateral independent control mode, a sequential control automatic bilateral coordination control mode and a sequential control manual mode are configured according to the actual working condition of the back-to-back direct current transmission system, so that the back-to-back direct current transmission system is controlled;
the method comprises the following steps that a following control automatic bilateral independent control mode is adopted, only the left side of a back-to-back direct current unit or the right side of the back-to-back direct current unit is subjected to following control state switching, whether the state of primary equipment and the state of secondary equipment related to the left side of the direct current unit or the right side of the direct current unit meet preset conditions or not is judged, when the preset conditions are met, a following control state switching operation instruction is sent out through an SCADA system, and the back-to-back direct current control system executes the following control state switching operation instruction, so that the left side of the direct current unit or the right side of the direct current unit is switched into the following control state; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control automatic bilateral coordination control mode is used for simultaneously switching sequential control states of the left side and the right side of the back-to-back direct current unit, firstly judging whether the states of primary equipment and secondary equipment related to the left side and the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sending a sequential control state switching operation instruction through an SCADA system, and executing the sequential control state switching operation instruction by the back-to-back direct current control system to enable the left side and the right side of the direct current unit to be switched into the sequential control states; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
in the forward control manual mode, the state of a single switch or a disconnecting link in the left side and the right side of the back-to-back direct current unit is switched, whether the switch or the isolating disconnecting link meets the interlocking condition of switching off or switching on is judged firstly, when the interlocking condition is met, a control operation instruction for switching the state of the switch or the isolating link is sent out through an SCADA system, and a back-to-back direct current control system executes the control operation instruction to realize the switching off or switching on operation of the switch or the isolating link; and when the interlocking condition is not met, the SCADA system is prohibited from sending out a control operation instruction for switching the states of the switch or the isolation switch.
2. The sequential control method for the back-to-back direct current transmission system according to claim 1, wherein the primary equipment comprises an isolation disconnecting link, a grounding disconnecting link, a converter transformer, a converter valve and a cooling system, and the secondary equipment comprises a pole control protection system, a valve control protection system and an auxiliary system.
3. The sequential control method of the back-to-back direct-current transmission system according to claim 1, wherein the performing of the sequential control state switching specifically comprises: the maintenance state is switched to a cold standby state, the cold standby state is switched to a current side hot standby state, the alternating current side hot standby state is switched to a hot standby state, the hot standby state is switched to an operation state, the operation state is switched to a hot standby state, the hot standby state is switched to the alternating current side hot standby state, the alternating current side hot standby state is switched to the cold standby state, and the cold standby state is switched to the maintenance state.
4. A sequential control method for a back-to-back dc power transmission system according to claim 3, wherein said switching of said service state to said cold standby state comprises the steps of: whether the related grounding disconnecting link meets the interlocking condition of the disconnecting link or not is judged, when the interlocking condition is met, a cold standby sequential control operation instruction is sent out through an SCADA system, and the back-to-back direct current control system automatically disconnects the related grounding disconnecting link.
5. A method of sequencing a back-to-back dc power transmission system as claimed in claim 3 wherein said cold standby switching ac side hot standby state comprises the steps of: whether the related isolation disconnecting link meets the interlocking condition of closing is judged firstly, and when the interlocking condition is met, an alternating current side hot standby sequential control operation instruction is sent out through an SCADA system, and the back-to-back direct current control system automatically closes the related isolation disconnecting link.
6. A method of sequencing a back-to-back dc power transmission system as claimed in claim 3, wherein said ac side hot standby state switching hot standby state comprises the steps of: whether the related switch and the isolation knife switch meet the interlocking condition of closing is judged firstly, and when the interlocking condition is met, a sequential control execution operation instruction is sent out through an SCADA system, and the back-to-back direct current control system automatically closes the related isolation knife switch and the switch.
7. A sequential control method for a back-to-back dc power transmission system according to claim 3, wherein said hot standby state switching operation state comprises the steps of: firstly, judging whether the converter valve at the side meets the unlocking condition, and when the unlocking condition is met, sending an operation sequence control operation instruction through the SCADA system, and automatically unlocking the converter valve at the side of the direct current unit by the back-to-back direct current control system.
8. A sequential control method for a back-to-back dc power transmission system according to claim 3, wherein said switching of said operational state to said hot standby state comprises the steps of: whether the converter valves on the two sides meet the locking condition is judged firstly, when the locking condition is met, a sequential control operation instruction is sent out through the SCADA system, the converter valves on the two sides of the direct current unit are automatically locked through the back-to-back direct current control system, the converter on the fixed power side is locked firstly, and then the converter on the fixed direct current voltage side is locked.
9. A method of sequencing a back-to-back dc power transmission system as claimed in claim 3, wherein said hot standby switching ac side hot standby state comprises the steps of: whether the related switches and the isolation disconnecting link meet the interlocking condition of the disconnecting link or not is judged, when the interlocking condition is met, a command for executing sequential control operation is sent out through an SCADA system, and the back-to-back direct current control system automatically disconnects the related switches and the isolation disconnecting link.
10. A sequential control system for a back-to-back dc power transmission system, said system comprising:
the sequential control automatic bilateral independent control module only switches the sequential control state of the left side of the back-to-back direct current unit or the right side of the back-to-back direct current unit, firstly judges whether the state of primary equipment and the state of secondary equipment related to the left side of the direct current unit or the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sends out a sequential control state switching operation instruction through an SCADA system, and the back-to-back direct current control system executes the sequential control state switching operation instruction to enable the left side of the direct current unit or the right side of the direct current unit to switch the sequential control state; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control automatic bilateral coordination control module is used for simultaneously switching sequential control states of the left side and the right side of the back-to-back direct current unit, judging whether the states of primary equipment and secondary equipment related to the left side and the right side of the direct current unit meet preset conditions or not, and when the preset conditions are met, sending a sequential control state switching operation instruction through an SCADA system, and executing the sequential control state switching operation instruction by the back-to-back direct current control system to enable the left side and the right side of the direct current unit to be switched into the sequential control states; when the preset condition is not met, the SCADA system is prohibited from sending a sequence control state switching operation instruction;
the sequential control manual module is used for switching the states of a single switch or an isolation disconnecting link in the left side and the right side of the back-to-back direct current unit, firstly judging whether the switch or the disconnecting link meets the interlocking condition of switching off or switching on, when the interlocking condition is met, sending a control operation instruction for switching the states of the switch or the isolation disconnecting link through the SCADA system, and executing the control operation instruction by the back-to-back direct current control system to realize the switching off or switching on operation of the switch or the isolation disconnecting link; and when the interlocking condition is not met, the SCADA system is prohibited from sending out a control operation instruction for switching the states of the switch or the isolation switch.
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