CN109802425B - Method and device for fault ride-through of passive delivery system of flexible direct current power grid - Google Patents
Method and device for fault ride-through of passive delivery system of flexible direct current power grid Download PDFInfo
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Abstract
The application relates to a method and a device for fault ride-through of a passive power transmission system of a flexible direct current power grid, wherein the method comprises the following steps: according to the running state information of the new energy power generation passive power transmission end converter station or the flexible direct current power grid, controlling the bidirectional thyristor switch to be put into operation, enabling the PCC point on the alternating current side of the new energy power generation passive power transmission end converter station to be communicated with the ground, and controlling the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end; controlling a bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground; the technical scheme provided by the application provides a mutual coordination and cooperation control method based on a parallel thyristor switch, a safety and stability control device and passive alternating current power grid protection, which can effectively limit active power flowing into a passive power supply end converter station in the process of disturbance accidents of the passive power supply end converter station, a power receiving end converter station and the power receiving end alternating current power grid of a flexible direct current power grid, and realize safe and efficient crossing of the flexible direct current power grid on the faults.
Description
Technical Field
The application relates to the field of household appliance control, in particular to a method and a device for fault ride-through of a passive power transmission system of a flexible direct current network.
Background
The increasing exhaustion of fossil energy is in urgent need of strategic adjustment of energy structures in china and even the world. The deep substitution of fossil energy by large-scale new energy power generation is a fundamental way of energy transformation and is also an important feature of a new generation power system.
At present, three networking modes of alternating current transmission, conventional direct current transmission and flexible direct current transmission mainly exist in wind power grid connection. Ac grid connection has the advantage of low cost in short-distance power transmission, but can directly influence the stable operation of a wind power plant when a system fails. The conventional direct current transmission technology converter station has large occupied area, needs to be provided with a large number of reactive compensation and filtering devices, increases the construction cost, needs to have an alternating current power grid support, and cannot work in a passive mode. The flexible direct current transmission technology is increasingly applied in the wind power grid connection field because of the advantages of flexible control, capability of connecting a passive power grid, no need of installing reactive compensation and filtering devices and the like.
The wind power plant is distributed in western and northern areas, and has the working condition of large-capacity new energy island grid-connected long-distance transmission, and when wind power is directly transmitted through soft direct grid connection, a feed-end converter station adopts a passive control mode to provide stable voltage and frequency for a new energy unit. The soft direct current power grid provides voltage support for new energy power generation passive grid connection, meanwhile, limiting factors are also more outstanding, a converter station connected with a new energy passive alternating current system cannot control alternating current voltage frequency and new energy power received by the alternating current voltage frequency at the same time, and unbalanced power (short time or permanent time) caused by faults can cause overcurrent of the source-end converter station or overvoltage of the soft direct current power grid. The faults which restrict the safe and reliable transmission of large-scale new energy power generation of the new energy flexible direct-current power grid passive delivery system are mainly of the following 3 types:
(1) After the single-pole locking failure of the passive end-transmitting converter station, the other pole overflows about 10 milliseconds, so that the whole converter station is locked, and the connected wind power plant is completely stopped;
(2) After the receiving-end converter station is subjected to monopolar or bipolar locking, the whole flexible direct-current power grid is shut down as a whole due to overvoltage about 30 milliseconds after the fault, and the connected wind power plant is shut down as a whole;
(3) After the short circuit fault occurs in the receiving end alternating current system, the whole flexible direct current power grid is shut down as a whole due to overvoltage, and the connected wind power plant is shut down as a whole.
For the three faults, the current feasible scheme is to add energy consumption devices, and the scheme is also a common choice after all new energy sources are comprehensively considered and compromised through flexible direct current passive output demonstration engineering. However, the economical efficiency of the scheme of adding the energy consumption device severely restricts the application of the flexible direct current and flexible direct current power grid in the new energy passive delivery scene.
Disclosure of Invention
The application provides a fault ride-through method and device for a passive delivery system of a flexible direct-current power grid, and aims to provide a mutual coordination and cooperation control method based on a parallel thyristor switch, a safety and stability control device and passive alternating-current power grid protection, which can effectively limit active power flowing into a passive delivery end converter station in the process of disturbance accidents of the passive delivery end converter station, a receiving end converter station and the receiving end alternating-current power grid of the flexible direct-current power grid, prevent the passive converter station from overflowing and the flexible direct-current power grid from being blocked due to overvoltage, and realize safe and efficient ride-through of the flexible direct-current power grid on the faults.
The application aims at adopting the following technical scheme:
in a method of flexible direct current power grid passive delivery system fault ride-through, the improvement comprising:
according to the running state information of the new energy power generation passive power transmission end converter station or the flexible direct current power grid, controlling the bidirectional thyristor switch to be put into operation, enabling the PCC point on the alternating current side of the new energy power generation passive power transmission end converter station to be communicated with the ground, and controlling the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end;
controlling a bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground;
one end of the bidirectional thyristor switch is connected with the alternating-current side PCC point of the new energy power generation passive power transmission end converter station, and the other end of the bidirectional thyristor switch is grounded.
Preferably, the operation state information of the passive power transmission converter station according to new energy power generation is communicated with the connection between the PCC point of the ac side of the passive power transmission converter station and the ground through a bidirectional thyristor switch, and controls the safety and stability control device to cut off the power generated by the passive power transmission terminal of the new energy power generation, and the method comprises the following steps:
when the new energy power generation passive terminal converter station has a monopole fault, and P is more than P i-max When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
when the PCC point on the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground, the safe and stable control device is controlled to cut off the power generated by the new energy power generation passive power transmission end;
wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
Preferably, the controlling the bidirectional thyristor switch according to the running state information of the flexible direct current power grid to put into operation, so that the communication between the PCC point of the alternating current side of the new energy power generation passive power transmission end converter station and the ground and controlling the safety and stability control device cuts off the power generated by the new energy power generation passive power transmission end comprise:
when the soft direct-current power grid has faults which cause the voltage of the direct-current power grid to rise, the voltage of the direct-current power grid is higher than a threshold value U of the voltage of the direct-current power grid DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and if the fault which causes the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device, controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation.
Preferably, the fault causing the dc grid voltage to rise includes: the direct current power grid receives the alternating current N-1/N-2 fault, receives the single-pole locking fault of the converter station and receives the double-pole locking fault of the converter station.
Further, the control safety and stability control device cuts off the minimum cutting off amount P of the new energy power generation passive transmitting end power generation power cut-min ≥(P-P i-max ) Wherein P is the total bipolar power of the passive end-transmitting converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
Preferably, the time for disconnecting the connection between the alternating-current side PCC point of the new energy power generation passive transmitting end converter station and the ground through the bidirectional thyristor switch is smaller than the passive alternating-current power grid protection action time.
In a device for fault ride-through in a passive delivery system for a flexible direct current grid, the improvement comprising:
the first control unit is used for controlling the bidirectional thyristor switch to be put into operation according to the running state information of the new energy power generation passive power transmission station or the flexible direct current power grid, so that the PCC point of the alternating current side of the new energy power generation passive power transmission station is communicated with the ground, and the safety and stability control device is controlled to cut off the power generated by the new energy power generation passive power transmission station;
the second control unit is used for controlling the bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground;
one end of the bidirectional thyristor switch is connected with the alternating-current side PCC point of the new energy power generation passive power transmission end converter station, and the other end of the bidirectional thyristor switch is grounded.
Preferably, the first control unit includes:
the first control module is used for generating a single-pole fault and P is more than P when the new energy power generation passive power transmission end converter station generates the single-pole fault i-max When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
the second control module is used for controlling the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end when the PCC point at the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
Preferably, the first control unit includes:
a third control module for, when the flexible direct current network fails and the direct current network voltage is higher than a threshold value U of the direct current network voltage DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and the fourth control module is used for controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation if the fault which leads to the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device.
Preferably, the fault causing the dc grid voltage to rise includes: the direct current power grid receives the alternating current N-1/N-2 fault, receives the single-pole locking fault of the converter station and receives the double-pole locking fault of the converter station.
Further, the control safety and stability control device cuts off the minimum cutting off amount P of the new energy power generation passive transmitting end power generation power cut-min ≥(P-P i-max ) Wherein P is the total bipolar power of the passive end-transmitting converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
Preferably, the time for disconnecting the connection between the alternating-current side PCC point of the new energy power generation passive transmitting end converter station and the ground through the bidirectional thyristor switch is smaller than the passive alternating-current power grid protection action time.
The application has the beneficial effects that:
according to the technical scheme provided by the application, the bidirectional thyristor switch is used for connecting and disconnecting the PCC point of the passive power supply end converter station of new energy power generation with the ground, and controlling the safety and stability control device to cut off the power generated by the passive power supply end of new energy power generation, so that the time sequence coordination of the bidirectional thyristor switch, the safety and stability control device and the protection action of the passive alternating current power grid is realized, the safe crossing of a flexible direct current power grid large-scale passive new energy power generation system to various alternating current and direct current faults is further realized, and the problem that the passive power supply end converter station is blocked in an overcurrent way and the flexible direct current power grid is stopped as a whole due to the alternating current and direct current faults is solved; meanwhile, the system can be applied to all new energy power generation flexible direct current power grid passive delivery systems, and has wide coverage range; has the advantages of low cost, convenient and flexible use and remarkable effect.
Drawings
FIG. 1 is a flow chart of a method of fault ride-through for a passive delivery system of a flexible direct current grid in accordance with the present application;
fig. 2 is a schematic diagram of an application scenario of a fault ride-through method of a passive power grid delivery system in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for fault ride-through of a passive power transmission system of a flexible direct current network.
Detailed Description
The following detailed description of specific embodiments of the application refers to the accompanying drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Aiming at the problem that when the flexible direct-current power grid performs large-scale passive power generation and passive delivery, the whole passive delivery converter station is blocked or the whole direct-current power grid is blocked due to the fact that the delivery-receiving end alternating-current and direct-current faults cannot be traversed, the application provides a fault traversing method of a flexible direct-current power grid passive delivery system, which monitors the running states of the passive delivery converter station and the direct-current power grid of the new power generation and takes the pole fault information of the passive delivery converter station and the voltage state information of the direct-current power grid as input quantities; when the new energy power generation passive transmitting end converter station is subjected to sound pole overcurrent blocking due to the occurrence of a monopole blocking fault, a pole control system of the converter station sends a control instruction to a parallel thyristor switch device arranged at a PCC point, so that the new energy power generation is forced to enter a low-voltage traversing process, surplus power is removed through a safe and stable control device, and reliable traversing of the fault is realized; when the new energy power generation passive power transmission end converter station detects the voltage rise of the direct current power grid, the passive power transmission end converter station pole control system sends a control instruction to the parallel thyristor switch device, and the voltage rise of the direct current power grid is restrained by temporarily limiting the power flowing into the passive power transmission end converter station; after the parallel thyristor switch arranged at the PCC point is put into operation, the exit time of the parallel thyristor switch needs to be matched with the switching time of the safety and stability control device and the protection time of the sending end passive alternating current power grid, so that the reliable action of the safety control device and the alternating current protection in the input period are ensured. The method provided by the application can effectively reduce and control the power balance of the direct current power grid in the process of disturbance accidents of the direct current power grid and the accessed alternating current power grid, and ensure the safety of passive output of large-scale new energy power generation of the direct current power grid, and as shown in fig. 1, the method comprises the following steps:
101. according to the running state information of the new energy power generation passive power transmission end converter station or the flexible direct current power grid, controlling the bidirectional thyristor switch to be put into operation, enabling the PCC point on the alternating current side of the new energy power generation passive power transmission end converter station to be communicated with the ground, and controlling the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end;
102. controlling a bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground;
one end of the bidirectional thyristor switch is connected with the alternating-current side PCC point of the new energy power generation passive power transmission end converter station, and the other end of the bidirectional thyristor switch is grounded.
The step 101 includes:
when the new energy power generation passive terminal converter station has a monopole fault, and P is more than P i-max When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
when the PCC point on the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground, the safe and stable control device is controlled to cut off the power generated by the new energy power generation passive power transmission end;
wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
Further, according to the running state information of the flexible direct current power grid, the bidirectional thyristor switch is controlled to be put into operation, so that the PCC point of the alternating current side of the convertor station of the passive power transmission end of the new energy power generation is communicated with the ground, and the safety and stability control device is controlled to cut off the power generated by the passive power transmission end of the new energy power generation, and the method comprises the following steps:
when the soft direct-current power grid has faults which cause the voltage of the direct-current power grid to rise, the voltage of the direct-current power grid is higher than a threshold value U of the voltage of the direct-current power grid DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and if the fault which causes the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device, controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation.
Further, the fault causing the dc grid voltage to rise includes: the direct current power grid receives the alternating current N-1/N-2 fault, receives the single-pole locking fault of the converter station and receives the double-pole locking fault of the converter station.
Further, the control safety and stability control device cuts off the minimum cutting off amount P of the new energy power generation passive transmitting end power generation power cut-min ≥(P-P i-max ) Wherein P is the total bipolar power of the passive end-transmitting converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
The time for disconnecting the connection between the alternating-current side PCC point of the new energy power generation passive transmitting end converter station and the ground through the bidirectional thyristor switch is smaller than the passive alternating-current power grid protection action time.
For example, as shown in fig. 2, a triac is provided on the ac side of the passive power transmission converter station of the flexible direct current network. One end (W) of the thyristor bidirectional switch is directly connected to an outlet line or a bus of the wind turbine generator, and the other end (S) of the thyristor bidirectional switch is directly connected with the ground; the passive end-feeding converter station is connected with the S end and the G end of the bidirectional thyristor switch to form a control loop, so that the input and the exit of the piezoelectric reactor are realized; the bidirectional thyristor switch is connected with the pole control system of the passive transmitting end converter station through a communication channel, and a pole control transmits a control instruction.
The on speed of the connection of the thyristor bidirectional switch and the ground is not more than 5 milliseconds, and the off time of the disconnection of the thyristor bidirectional switch and the ground is not more than 10 milliseconds.
The high-speed breaking capacity of the bidirectional thyristor switch is fully utilized, and the bidirectional thyristor switch is coordinated with the safety and stability control device to realize effective control of the power flowing into the passive terminal converter station.
S1, when the new energy power generation passive power transmission end converter station has a monopole fault, and P is more than P i-max When the bidirectional thyristor switch is controlled to be put into operation, the passive power supply end new energy power generation rapidly enters a low-voltage ride through stage, meanwhile, the PCC point of the alternating-current side of the passive power supply end converter station of the new energy power generation is communicated with the ground, and at the moment, the power flowing into the passive power supply end converter station is approximately 0;
when the PCC point on the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground, the safe and stable control device is controlled to rapidly cut off the power generated by the new energy power generation passive power transmission end;
the control safety and stability control device cuts off the minimum cutting off amount P of the new energy power generation passive power transmission end power generation power cut-min ≥(P-P i-max )；
Wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
S2, when the soft direct-current power grid has a fault which leads to the voltage rise of the direct-current power grid, and the voltage of the direct-current power grid is higher than a threshold value U of the voltage of the direct-current power grid DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and if the fault which causes the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device, controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation.
S3, disconnecting the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station from the ground through a bidirectional thyristor switch;
furthermore, the time for disconnecting the connection between the alternating-current side PCC point of the new energy power generation passive transmitting end converter station and the ground through the bidirectional thyristor switch is smaller than the passive alternating-current power grid protection action time.
The input time and the disconnection time of the bidirectional thyristor switch are matched with the control time of the safety and stability control device and the protection action time of the passive alternating current power grid in time sequence, so that the safety and stability control device can reliably cut off surplus new energy power generation passive power transmission end power generation and passive alternating current protection from misoperation during the input period of the bidirectional thyristor switch.
Specific notes are:
(1) The communication between the parallel bidirectional thyristor switch and the passive transmitting end converter station is realized through a special direct-connection optical fiber channel, the time delay from the polar control outlet to the time delay required for receiving a control instruction from the parallel thyristor switch is not more than 2 milliseconds, and the whole control process is not more than 5 milliseconds;
(2) The control system aims at a parallel bidirectional thyristor switch control system, adopts a structure form that a bidirectional thyristor switching switch is connected with a reactor in series, is connected in parallel at a bus of the alternating current side of a passive end-feeding converter station, and the thyristor switch is used for rapidly switching in and switching out the grounding, wherein the switching speed is not more than 3 milliseconds.
The application also provides a device for fault ride-through of the passive power transmission system of the flexible direct current power grid, as shown in fig. 3, the device comprises:
the first control unit is used for controlling the bidirectional thyristor switch to be put into operation according to the running state information of the new energy power generation passive power transmission station or the flexible direct current power grid, so that the PCC point of the alternating current side of the new energy power generation passive power transmission station is communicated with the ground, and the safety and stability control device is controlled to cut off the power generated by the new energy power generation passive power transmission station;
the second control unit is used for controlling the bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground;
one end of the bidirectional thyristor switch is connected with the alternating-current side PCC point of the new energy power generation passive power transmission end converter station, and the other end of the bidirectional thyristor switch is grounded.
The first control unit includes:
the first control module is used for generating a single-pole fault and P is more than P when the new energy power generation passive power transmission end converter station generates the single-pole fault i-max When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
the second control module is used for controlling the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end when the PCC point at the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
The first control unit further includes:
a third control module for, when the flexible direct current network fails and the direct current network voltage is higher than a threshold value U of the direct current network voltage DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and the fourth control module is used for controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation if the fault which leads to the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device.
Further, the fault causing the dc grid voltage to rise includes: the direct current power grid receives the alternating current N-1/N-2 fault, receives the single-pole locking fault of the converter station and receives the double-pole locking fault of the converter station.
Wherein, the control safety and stability control device cuts off the minimum cutting off amount P of the new energy power generation passive transmitting end power generation power cut-min ≥(P-P i-max ) Wherein P is the total bipolar power of the passive end-transmitting converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
And the time for disconnecting the connection between the alternating-current side PCC point of the new energy power generation passive power transmission end converter station and the ground through the bidirectional thyristor switch is smaller than the passive alternating-current power grid protection action time.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (8)
1. A method for fault ride-through of a passive delivery system of a flexible direct current grid, the method comprising:
controlling a bidirectional thyristor switch to be put into operation according to the running state information of the new energy power generation passive power transmission end converter station or the flexible direct current power grid, so that the PCC point of the new energy power generation passive power transmission end converter station on the alternating side is communicated with the ground, and controlling a safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end;
controlling a bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground;
one end of the bidirectional thyristor switch is connected with the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station, and the other end of the bidirectional thyristor switch is grounded;
the passive end converter station of new energy power generation is connected with the connection between the PCC point of the alternating side of the passive end converter station of new energy power generation and the ground through a bidirectional thyristor switch according to the running state information of the passive end converter station of new energy power generation, and the safe and stable control device is controlled to cut off the power of the passive end converter station of new energy power generation, and the method comprises the following steps:
when the new energy power generation passive terminal converter station has a monopole fault, and P is more than P i-max When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
when the PCC point on the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground, the safe and stable control device is controlled to cut off the power generated by the new energy power generation passive power transmission end;
wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Maximum power that can be tolerated by the sound pole;
the control of the bidirectional thyristor switch according to the running state information of the flexible direct current power grid enables the communication between the PCC point of the alternating current side of the new energy power generation passive power transmission end converter station and the ground and controls the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end, and the control device comprises the following steps:
when the soft direct-current power grid has faults which cause the voltage of the direct-current power grid to rise, the voltage of the direct-current power grid is higher than a threshold value U of the voltage of the direct-current power grid DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and if the fault which causes the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device, controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation.
2. The method of claim 1, wherein the fault that causes the dc grid voltage to rise comprises: the direct current power grid receives the alternating current N-1/N-2 fault, receives the single-pole locking fault of the converter station and receives the double-pole locking fault of the converter station.
3. The method according to claim 1 or 2, wherein the control safety and stability control device cuts off the minimum cutting-off amount P of the new energy power generation passive power supply end power generation cut-min ≥(P-P i-max ) Wherein P is the total bipolar power of the passive end-transmitting converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
4. The method of claim 1, wherein the time to disconnect the new energy generating passive power transmitting end converter station ac side PCC point from ground by a triac is less than a passive ac grid protection action time.
5. A device for fault ride-through of a passive delivery system of a flexible direct current grid, the device comprising:
the first control unit is used for controlling the bidirectional thyristor switch to be put into operation according to the running state information of the new energy power generation passive power transmission end converter station or the flexible direct current power grid, so that the PCC point of the new energy power generation passive power transmission end converter station is communicated with the ground, and the safety and stability control device is controlled to cut off the power generated by the new energy power generation passive power transmission end;
the second control unit is used for controlling the bidirectional thyristor switch to disconnect the connection between the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station and the ground;
one end of the bidirectional thyristor switch is connected with the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station, and the other end of the bidirectional thyristor switch is grounded;
the first control unit includes:
the first control module is used for generating a single-pole fault and P is more than P when the new energy power generation passive power transmission end converter station generates the single-pole fault i-max When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
the second control module is used for controlling the safety and stability control device to cut off the power generated by the new energy power generation passive power transmission end when the PCC point at the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
wherein P is the total bipolar power of the passive transmitting-end converter station before failure, and P i-max Maximum power that can be tolerated by the sound pole;
the first control unit includes:
a third control module for generating a voltage rise of the DC power grid when the soft DC power grid occursAnd the DC network voltage is higher than the threshold value U of the DC network voltage DC-ref When the bidirectional thyristor switch is controlled to be put into operation, the PCC point of the alternating-current side of the new energy power generation passive power transmission end converter station is communicated with the ground;
and the fourth control module is used for controlling the safety and stability control device to cut off the power generated by the passive power transmission end of the new energy power generation if the fault which leads to the voltage rise of the direct current power grid reaches the fortification standard of the safety and stability control device.
6. The apparatus of claim 5, wherein the fault causing the dc grid voltage to rise comprises: the direct current power grid receives the alternating current N-1/N-2 fault, receives the single-pole locking fault of the converter station and receives the double-pole locking fault of the converter station.
7. The device according to claim 5 or 6, wherein the control safety and stability control device cuts off the minimum cut-off amount P of the power generated by the passive power supply end of the new energy power generation cut-min ≥(P-P i-max ) Wherein P is the total bipolar power of the passive end-transmitting converter station before failure, and P i-max Is the maximum power that can be born by the sound pole.
8. The apparatus of claim 5, wherein a time to disconnect the new energy generating passive power transmitting end converter station ac side PCC point from ground by a triac is less than a passive ac grid protection action time.
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