CN114285067B - Fault ride-through method and device and storage medium - Google Patents
Fault ride-through method and device and storage medium Download PDFInfo
- Publication number
- CN114285067B CN114285067B CN202111667691.7A CN202111667691A CN114285067B CN 114285067 B CN114285067 B CN 114285067B CN 202111667691 A CN202111667691 A CN 202111667691A CN 114285067 B CN114285067 B CN 114285067B
- Authority
- CN
- China
- Prior art keywords
- voltage
- direct current
- current voltage
- direct
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000005540 biological transmission Effects 0.000 claims abstract description 73
- 238000011084 recovery Methods 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 15
- 230000003044 adaptive effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000013528 artificial neural network Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013135 deep learning Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a fault ride-through method, a device and a storage medium, which are used for a flexible direct current transmission system for supplying power to an oil and gas drilling platform (oil and gas platform for short), wherein the flexible direct current transmission system comprises an alternating current grid side converter station, an oil and gas platform side converter station and a direct current cable for connecting the two converter stations, and the method comprises the following steps: detecting direct-current voltage of a converter station of an oil-gas platform; judging whether the direct-current voltage is lower than a preset direct-current voltage threshold value or not; when the direct current voltage is lower than the direct current voltage threshold value, calculating an alternating current voltage adjustment amount; and controlling the alternating current voltage output by the oil-gas platform side converter station to be reduced according to the alternating current voltage adjustment quantity. The problem of the oil gas platform alternating current power grid fault ride through that is supplied through flexible direct current transmission system in prior art is solved.
Description
Technical Field
The present invention relates to the field of flexible dc power transmission technologies, and in particular, to a fault ride-through method, apparatus, and storage medium.
Background
The flexible DC transmission technology is one new generation of high voltage DC transmission technology based on voltage source converter, self-turn-off device (IGBT) and Pulse Width Modulation (PWM) technology. Compared with the traditional high-voltage direct-current transmission, the flexible direct-current transmission technology has strong controllability, and the turn-off device can perform complete control on the switch, and the alternating-current side is not required to provide phase-change current, so that the problem of phase-change failure is avoided; the flexible direct current power transmission is free from a large amount of reactive power support on the alternating current side due to complete control, so that the occupied area is reduced; the passive characteristic can finish supplying power to an island (only by using regional small power grids connected by a plurality of power lines), so that the problem of last kilometer in a weak area of the grid frame is solved; the switching frequency of the fully-controlled device is extremely high, the frequency is thousands of hertz, the filtering can be completed only by a small amount of high-order filters, and the pollution of low-order harmonics to a power grid is avoided. For the Chinese power grid, the frequency of the alternating current power grid is 50 Hz, so that the low order harmonic wave is more difficult to treat than the high order harmonic wave. The power flow of the flexible direct current transmission technology is reversed rapidly, the current of the flexible direct current transmission system can flow bidirectionally, and meanwhile, the positive and negative poles of the direct current voltage are kept unchanged. When the conventional DC power flow is reversed, the polarity of the DC voltage is reversed, and the direction of the DC current is unchanged. In the parallel type multi-terminal direct current transmission system, the flexible direct current transmission system can change the direction of tide by changing the direction of single-terminal current, and the parallel type multi-terminal direct current transmission system primarily has the function of multi-point transmission. Therefore, the flexible direct current transmission technology is very suitable for supplying power to passive networks such as a disconnection power grid losing a power generation unit, an isolated island power grid, an offshore oil and gas platform and the like.
In the scene that the flexible direct current transmission technology is applied to an oil-gas platform power supply system, the tide of the whole system only has a single direction from an alternating current power grid side converter station to the oil-gas platform side converter station, so when the alternating current power grid side fails, the alternating current voltage of the alternating current power grid rapidly drops, and the power input into the flexible direct current transmission system is reduced. Because the alternating voltage (and frequency) output by the oil-gas platform side converter station is equipment for controlling the oil-gas platform side, the oil-gas platform side converter station cannot directly sense fault information of the alternating current power grid side, and therefore the oil-gas platform side still continues to draw constant power from the flexible direct current power transmission system in a time period before learning of faults, and further power imbalance between a transmitting end and a receiving end of the flexible direct current power transmission system is caused. The output power of the oil-gas platform side is larger than the input power of the alternating current power grid side, and the direct current voltage is reduced. If the direct-current voltage drop can not be effectively restrained, the direct-current voltage under-voltage protection can be triggered, the whole flexible direct-current power transmission system is stopped, and then tripping of all loads on the oil-gas platform side is caused. The existing scheme is that the AC power grid side transmits fault information to the oil-gas platform side in a communication mode, and then corresponding loads are cut off through targeted processing scheduling of the oil-gas platform side, so that power balance of a transmitting end and a receiving end is guaranteed. However, the scheme is too dependent on communication, and the load on the oil-gas platform side is cut off from accurate fault judgment on the alternating current power grid side, wherein the required processing time is relatively long, namely, protection can be triggered before the load is processed, so that the whole flexible direct current power transmission system is still forced to be stopped, and the operation reliability of the flexible direct current power transmission system is seriously influenced.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a fault ride-through method, a fault ride-through device, and a storage medium.
According to a first aspect, a fault ride-through method is provided according to an embodiment of the present invention, and is used for a flexible direct current transmission system powered by an oil-gas platform, where the flexible direct current transmission system includes an ac grid-side converter station, an oil-gas platform-side converter station, and a direct current cable connecting the two converter stations, and the fault ride-through method includes:
detecting direct-current voltage of a converter station of an oil-gas platform;
judging whether the direct-current voltage is lower than a preset direct-current voltage threshold value or not;
when the direct current voltage is lower than the direct current voltage threshold value, calculating an alternating current voltage adjustment quantity, wherein the alternating current voltage adjustment quantity is adaptive to the change quantity of the direct current voltage relative to a reference direct current voltage, and the reference direct current voltage is the direct current voltage output by the alternating current power grid side converter station in a stable state of the flexible direct current power transmission system;
and controlling the alternating current voltage output by the oil-gas platform side converter station to be reduced according to the alternating current voltage adjustment quantity.
Preferably, when the dc voltage is lower than the dc voltage threshold, calculating the ac voltage adjustment amount includes:
calculating a difference value between the direct current voltage and a reference direct current voltage based on a preset reference direct current voltage;
and converting the difference value to obtain the alternating voltage adjustment quantity.
Preferably, the ac voltage adjustment amount is calculated by the following formula:
△V＝K M (V dcref -V dc )
wherein DeltaV represents the AC voltage adjustment amount, K M Represents the gain factor, (V) dcref -V dc ) Representing the difference between the reference DC voltage and the actual DC voltage, V dcref Representing a reference DC voltage, V dc Representing the actual dc voltage.
Preferably, the fault ride-through method further comprises:
when the direct current voltage is not lower than the direct current voltage threshold, controlling the oil-gas platform side converter station to output alternating current voltage according to a preset reference alternating current voltage, wherein the reference alternating current voltage is the alternating current voltage output by the oil-gas platform side converter station in a stable state of the flexible direct current transmission system.
Preferably, after the ac voltage output by the oil-gas platform side converter station is controlled to be reduced according to the ac voltage adjustment amount, the fault ride-through method further includes:
calculating a recovery adjustment amount;
and controlling the alternating current voltage output by the oil-gas platform side converter station to step up according to the recovery adjustment quantity.
Preferably, the calculating the restoration adjustment amount includes:
re-detecting the current direct-current voltage of the oil-gas platform converter station;
calculating a difference between the direct current voltage and the current direct current voltage based on the direct current voltage and the current direct current voltage;
and converting by utilizing the difference value between the direct current voltage and the current direct current voltage to obtain the recovery adjustment quantity.
Preferably, after the alternating voltage output by the oil-gas platform side converter station is controlled to step up according to the recovery adjustment amount, the fault ride-through method further includes:
and after the fault is completely cleared, controlling the alternating voltage output by the oil-gas platform side converter station to step up to the reference alternating voltage.
According to a second aspect, a fault ride-through device is provided according to an embodiment of the present invention, and is used for a flexible direct current transmission system for supplying power to an oil-gas platform, where the flexible direct current transmission system includes an ac grid-side converter station, an oil-gas platform-side converter station, and a direct current cable connecting the two converter stations, and the fault ride-through device includes:
the detection module is used for detecting the direct-current voltage of the oil-gas platform converter station;
the judging module is used for judging whether the direct-current voltage is lower than a preset direct-current voltage threshold value or not;
the calculation module is used for calculating an alternating voltage adjustment quantity when the direct voltage is lower than the direct voltage threshold value, wherein the alternating voltage adjustment quantity is adaptive to the change quantity of the direct voltage relative to a reference direct voltage, and the reference direct voltage is the direct voltage output by the alternating current power grid side converter station in a stable state of the flexible direct current transmission system;
and the control module is used for controlling the alternating voltage output by the oil-gas platform side converter station to be reduced according to the alternating voltage adjustment quantity.
In a third aspect, a fault ride-through device according to an embodiment of the present invention includes: the fault ride-through method according to any one of the first aspect is implemented by the processor executing the computer instructions.
In a fourth aspect, according to an embodiment of the present invention, there is provided a non-transitory computer readable storage medium storing computer instructions that, when executed by a processor, implement the fault ride-through method of any one of the first aspects.
The fault ride-through method, the fault ride-through device and the storage medium provided by the embodiment of the invention have at least the following beneficial effects:
according to the fault ride-through method, the fault ride-through device and the storage medium provided by the embodiment of the invention, whether the AC power grid side has faults or not is determined by detecting the DC voltage of the oil-gas platform converter station and judging whether the DC voltage is lower than the preset DC voltage threshold value. When the direct-current voltage is lower than the direct-current voltage threshold, namely when the fault of the alternating-current power grid side is judged, the alternating-current voltage output by the oil-gas platform side converter station is controlled to be reduced by calculating the alternating-current voltage adjustment quantity according to the alternating-current voltage adjustment quantity. The corresponding alternating voltage adjustment quantity is obtained through the adaptive calculation of the direct voltage relative to the change quantity of the reference direct voltage, and then the alternating voltage output by the oil-gas platform side converter station is accurately reduced, so that the problem that the direct voltage output by the alternating current power grid side converter station is reduced due to the fact that the alternating current power grid side should fail is solved, the power balance of a transmitting end and a receiving end is guaranteed, the triggering of direct voltage under-voltage protection is avoided, the fact that the whole flexible direct current transmission system is forced to stop is avoided, the whole flexible direct current transmission system can smoothly transmit power, and the operation reliability of the flexible direct current transmission system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a fault ride-through method according to an embodiment of the present invention;
FIG. 2 is a block diagram of a flexible DC power transmission system for supplying power to an oil and gas platform according to an embodiment of the present invention;
fig. 3 is a block diagram of a control system of a converter station at an ac power grid side according to an embodiment of the present invention;
fig. 4 is a block diagram of a control system of a converter station on an oil-gas platform side according to an embodiment of the present invention;
fig. 5 is a block diagram of a fault traversing apparatus according to an embodiment of the present invention;
fig. 6 is a block diagram of a fault-ride-through device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a fault ride through method provided by an embodiment of the invention, and fig. 2 is a block diagram of a flexible dc power transmission system for supplying power to an oil and gas platform provided by an embodiment of the invention. While the processes described below include a plurality of operations that occur in a particular order, it should be understood that the processes may include additional or fewer operations, which may be performed in sequence or in parallel.
In the flexible dc power transmission system for supplying power to an oil and gas platform shown in fig. 2, a transmitting end and a receiving end may be included, where the transmitting end is an ac power grid side and the receiving end is an oil and gas platform side. Alternating current generated by an alternating current power grid at an alternating current power grid side is converted into direct current through a converter station at the alternating current power grid side, and the direct current is transmitted to a converter station at an oil-gas platform side; the oil-gas platform side converter station receives direct current and converts the direct current into alternating current for the oil-gas platform to use. In general, a sender and a receiverAt least one of the terminals adopts a constant direct current voltage control mode. In the flexible direct current transmission system for supplying power to the oil-gas platform shown in fig. 2, an alternating current power grid side converter station adopts a constant direct current voltage control mode and a constant reactive power control mode, and a control block diagram is shown in fig. 3; the oil-gas platform side converter station adopts a constant alternating voltage control mode, the control block diagram is shown in figure 4, and u in figure 4 d_ref Is the d-axis component reference value of the output alternating voltage under the dq rotating coordinate system, u q_ref Is the q-axis component reference value of the output ac voltage in the dq rotational coordinate system. The constant direct current voltage control mode is beneficial to improving the stability of the alternating current voltage of the converter station by keeping the voltage equal to the setting value of the voltage regulator. When the oil-gas platform side fails, the flexible direct current transmission system carries out self-adaptive control on the direct current voltage output by the alternating current power grid side converter station so as to realize self-adaptive adjustment of power transmission, thereby adapting to the power change caused by the failure of the oil-gas platform side and ensuring that the voltage change of the flexible direct current transmission system does not trigger a protection mechanism.
Referring to fig. 1, the embodiment of the invention further provides a fault ride-through method, which is used for a flexible direct current transmission system powered by an oil-gas platform, wherein the flexible direct current transmission system comprises an alternating current grid-side converter station, an oil-gas platform-side converter station and a direct current cable connecting the two converter stations, and the fault ride-through method comprises the following steps:
step S101, detecting direct-current voltage of a converter station of an oil-gas platform;
step S102, judging whether the direct-current voltage is lower than a preset direct-current voltage threshold value;
step S103, calculating an alternating voltage adjustment amount when the direct voltage is lower than the direct voltage threshold, wherein the alternating voltage adjustment amount is adaptive to the change amount of the direct voltage relative to a reference direct voltage, and the reference direct voltage is the direct voltage output by the alternating current grid side converter station in a stable state of the flexible direct current transmission system;
and step S104, controlling the alternating current voltage output by the oil-gas platform side converter station to be reduced according to the alternating current voltage adjustment quantity.
In this embodiment, in particular, in a flexible direct current power transmission system for oil and gas platform power supply, the flexible direct current power transmission system includes an alternating current grid-side converter station and an oil and gas platform-side converter station. The direct voltage detection mode may include direct measurement or indirect measurement, wherein the direct measurement is generally implemented by detecting a magnetic field generated by a current through a series resistor, and the indirect measurement is generally implemented by detecting the magnitude of the current through the magnitude of the magnetic field, which is generated around the current, so as to indirectly obtain the magnitude of the current to be detected. The direct measurement mainly refers to measurement by using a current divider, the current divider is constructed according to the principle that voltage is generated at two ends of a resistor when direct current passes through the resistor, the current divider can be externally connected with an amplifying circuit to amplify signals, and the signals are converted into digital signals through an A/D (analog to digital) conversion circuit. The indirect measurement takes a direct current transformer as an example, and the direct current transformer is a direct current sensor constructed based on a magnetic modulation principle, utilizes nonlinearity and asymmetry of an iron core in an iron core coil when the iron core is magnetized together by direct current and alternating current, and converts direct current heavy current passing through the coil into direct current light current according to the inverse proportion of turns through a rectification circuit, and is mainly used for measuring direct current heavy current and also used as a current feedback, control and protection element in a rectification system.
When the AC power grid side fails, the AC voltage of the AC power grid rapidly drops, and the DC voltage corresponding to the AC power grid side converter station and the oil-gas platform side converter also rapidly drops. Judging whether the direct-current voltage of the oil-gas platform converter station is lower than a preset direct-current voltage threshold value or not; when the direct current voltage is lower than the direct current voltage threshold value, the fault of the alternating current power grid side can be judged; and calculating an alternating current voltage adjustment quantity, wherein the alternating current voltage adjustment quantity is adapted to the change quantity of the direct current voltage relative to a reference direct current voltage, and the reference direct current voltage is the direct current voltage output by the alternating current power grid side converter station in the steady state of the flexible direct current power transmission system. And controlling the alternating current voltage output by the oil-gas platform side converter station to be reduced according to the alternating current voltage adjustment quantity. Specifically, the ac voltage adjustment amount is calculated according to the variation amount of the dc voltage with respect to the reference dc voltage. For example, when the detected dc voltage is 1800V and the reference dc voltage is 2000V, the variation of the dc voltage with respect to the reference dc voltage is 200V, and when the detected dc voltage is 1600V, the variation of the dc voltage with respect to the reference dc voltage is 400V. The alternating voltage adjustment quantity is adapted to the change quantity of the direct voltage relative to the reference direct voltage, namely when the detected direct voltage is 1800V, the alternating voltage adjustment quantity is calculated based on the change quantity of 200V, when the detected direct voltage is 1600V, the alternating voltage adjustment quantity is calculated based on the change quantity of 400V, the alternating voltage adjustment quantity is adapted to the change quantity of the direct voltage relative to the reference direct voltage, and then the alternating voltage output by the gas platform side converter station is accurately reduced, so that the power balance of a transmitting end and a receiving end is ensured, the triggering of the direct voltage under-voltage protection is avoided, and the fault ride-through of the whole flexible direct current transmission system is ensured.
In the above embodiment, specifically, whether the ac grid side fails is determined by detecting the dc voltage of the oil-gas platform converter station and determining whether the dc voltage is lower than a preset dc voltage threshold. When the direct-current voltage is lower than the direct-current voltage threshold, namely when the fault of the alternating-current power grid side is judged, the alternating-current voltage output by the oil-gas platform side converter station is controlled to be reduced by calculating the alternating-current voltage adjustment quantity according to the alternating-current voltage adjustment quantity. The corresponding alternating voltage adjustment quantity is obtained through the adaptive calculation of the direct voltage relative to the change quantity of the reference direct voltage, and then the alternating voltage output by the oil-gas platform side converter station is accurately reduced, so that the problem that the direct voltage output by the alternating current power grid side converter station is reduced due to the fact that the alternating current power grid side should fail is solved, the power balance of a transmitting end and a receiving end is ensured, the triggering of direct voltage under-voltage protection is avoided, the forced outage of the whole flexible direct current transmission system is avoided, the whole flexible direct current transmission system can successfully pass through in a fault mode, and the transmission efficiency of the flexible direct current transmission system is improved. The fault ride-through method is easy to implement, has small delay compared with a mode of transmitting fault information by means of communication, and is independent of communication.
In an optional embodiment, specifically, step S103, when the dc voltage is lower than the dc voltage threshold, calculating the ac voltage adjustment amount includes:
calculating a difference value between the direct current voltage and a reference direct current voltage based on a preset reference direct current voltage;
and converting the difference value to obtain the alternating voltage adjustment quantity.
Further, the ac voltage adjustment amount is calculated by the following formula:
△V＝K M (V dcref -V dc )
wherein DeltaV represents the AC voltage adjustment amount, K M Represents the gain factor, (V) dcref -V dc ) Representing the difference between the reference DC voltage and the actual DC voltage, V dcref Representing a reference DC voltage, V dc Representing the actual dc voltage.
In the above embodiment, specifically, if the dc voltage decreases, the ac voltage output by the oil-gas platform side converter station will also decrease, so as to limit the power drawn by the load (secondary load) of the oil-gas platform, thereby realizing power balance of the transmitting and receiving ends, maintaining the dc voltage within an acceptable range, continuing to transmit power, and avoiding the interruption of power transmission caused by forced outage of the whole flexible dc power transmission system. By the formula Δv=k M (V dcref -V dc ) The alternating voltage adjustment quantity can be accurately calculated, so that the control efficiency of the alternating voltage output by the oil-gas platform side converter station is improved, the situation that excessive load is closed blindly for ensuring continuous power transmission is avoided, and the power transmission efficiency of the flexible direct current power transmission system is further improved.
In one embodiment, in particular, the fault ride-through method further includes:
when the direct current voltage is not lower than the direct current voltage threshold, controlling the oil-gas platform side converter station to output alternating current voltage according to a preset reference alternating current voltage, wherein the reference alternating current voltage is the alternating current voltage output by the oil-gas platform side converter station in a stable state of the flexible direct current transmission system.
In one embodiment, specifically, after controlling the ac voltage output by the oil-gas platform side converter station to be reduced according to the ac voltage adjustment amount, the fault ride-through method further includes:
calculating a recovery adjustment amount;
and controlling the alternating current voltage output by the oil-gas platform side converter station to step up according to the recovery adjustment quantity.
Further, the calculating the restoration adjustment amount includes:
re-detecting the current direct-current voltage of the oil-gas platform converter station;
calculating a difference between the direct current voltage and the current direct current voltage based on the direct current voltage and the current direct current voltage;
and converting by utilizing the difference value between the direct current voltage and the current direct current voltage to obtain the recovery adjustment quantity.
In the above embodiment, specifically, the fault removal on the ac grid side is a certain process. That is, when the fault on the ac power grid side is repaired to a corresponding extent, the repaired portion is put back into use, so that the receiving end on the oil-gas platform side should correspondingly increase the power corresponding to the output of the repair portion, so as to improve the power transmission efficiency of the flexible dc power transmission system.
In the above embodiment, for example, the reference dc voltage is 2000V, the detected dc voltage is 1600V, after the ac voltage output by the oil-gas platform side converter station is controlled to be reduced, the current dc voltage of the oil-gas platform side converter station is re-detected to be 1800V, the calculated difference value is 200V, the difference value of 200V is converted into the corresponding recovery adjustment amount, and the ac voltage output by the oil-gas platform side converter station is controlled to be stepped up according to the converted recovery adjustment amount.
Further, the alternating current voltage output by the oil-gas platform side converter station is controlled to step up, the direct current voltage can be detected again, if the voltage is 1900V, the 300V difference value is converted into the corresponding recovery adjustment amount, the alternating current voltage output by the oil-gas platform side converter station is controlled to step up according to the recovery adjustment amount, the step up should be considered, and repeated step up is avoided.
Further, after the alternating voltage output by the oil-gas platform side converter station is controlled to step up according to the recovery adjustment amount, the fault ride-through method further includes:
and after the fault is completely cleared, controlling the alternating voltage output by the oil-gas platform side converter station to step up to the reference alternating voltage.
In the above embodiment, when the ac power grid side fails, the ac voltage output by the converter station at the oil-gas platform side is controlled to be reduced, so that power balance between the transmitting end and the receiving end is realized, triggering of the dc voltage under-voltage protection is avoided, the whole flexible dc power transmission system is prevented from being forced to stop, the whole flexible dc power transmission system can smoothly transmit power, and the power transmission efficiency of the flexible dc power transmission system is improved. In the fault repairing process, the alternating voltage output by the oil-gas platform side converter station is boosted in time, and the operation reliability is further improved.
Example 2
Referring to fig. 5, an embodiment of the present invention further provides a fault ride-through device, for a flexible dc power transmission system powered by an oil-gas platform, where the flexible dc power transmission system includes an ac grid-side converter station and an oil-gas platform-side converter station, and a dc cable connecting the two converter stations, where the fault ride-through device includes:
the detection module 51 is used for detecting direct-current voltage of the oil-gas platform converter station;
a judging module 52, configured to judge whether the dc voltage is lower than a preset dc voltage threshold;
a calculating module 53, configured to calculate an ac voltage adjustment amount when the dc voltage is lower than the dc voltage threshold, where the ac voltage adjustment amount is adapted to a variation of the dc voltage with respect to a reference dc voltage, where the reference dc voltage is a dc voltage output by the ac grid-side converter station in a steady state of the flexible dc power transmission system;
and the control module 54 is used for controlling the alternating voltage output by the oil-gas platform side converter station to be reduced according to the alternating voltage adjustment amount.
The fault ride-through system provided by the embodiment of the invention can be used for the fault ride-through method in the above embodiment, and related details refer to the above method embodiment, so that the implementation principle and the technical effect are similar, and are not repeated here.
It should be noted that: in the fault traversing device provided in the above embodiment, only the division of the above functional modules is used for illustration, and in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the fault traversing device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the fault traversing system and the fault traversing method provided in the foregoing embodiments belong to the same concept, and detailed implementation processes of the fault traversing system and the fault traversing method are described in the foregoing method embodiments, which are not repeated herein.
Example 3
The present embodiment provides a fault ride-through device, as shown in fig. 6, comprising a processor and a memory, wherein the processor and the memory may be connected by a bus or otherwise, as exemplified by the bus connection in fig. 6.
The processor may be a central processing unit (Central Processing Unit, CPU) or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), graphics processor (Graphics Processing Unit, GPU), embedded Neural network processor (Neural-network Processing Unit, NPU) or other special purpose deep learning coprocessor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete or transistor logic device, discrete hardware components, or any combination thereof.
The memory, as a non-transitory computer readable storage medium, may be used to store a non-transitory software program, a non-transitory computer executable program, and a module, such as program instructions/modules corresponding to the fault-ride-through method in the embodiments of the present invention. The processor implements the fault ride-through method in the above method embodiments by executing non-transitory software programs, instructions, and modules stored in the memory to perform various functional applications and data processing of the processor.
The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data created by the processor, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory may optionally include memory located remotely from the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The one or more modules are stored in the memory and when executed by the processor implement the fault ride-through method of the above-described method embodiments.
Embodiments of the present invention also provide a non-transitory computer readable storage medium storing computer executable instructions that are capable of performing the fault ride-through method of any of the above-described method embodiments. Wherein the non-transitory computer readable storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the non-transitory computer readable storage medium may also include a combination of the above types of memory.
It will be appreciated by those skilled in the art that embodiments of the invention may be provided as methods, apparatus, or non-transitory computer-readable storage media, all of which may relate to or comprise a computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It will be apparent that the examples described above represent only a few embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that other variations or modifications in the above description can be made by those of ordinary skill in the art without departing from the spirit of the invention. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The utility model provides a fault ride-through method, is used for the flexible direct current transmission system of oil gas platform power supply, flexible direct current transmission system includes alternating current network side converter station and oil gas platform side converter station and connects the direct current cable of two converter stations, characterized in that, the fault ride-through method includes:
detecting direct-current voltage of a converter station of an oil-gas platform;
judging whether the direct-current voltage is lower than a preset direct-current voltage threshold value or not;
when the direct current voltage is lower than the direct current voltage threshold value, calculating an alternating current voltage adjustment quantity, wherein the alternating current voltage adjustment quantity is adaptive to the change quantity of the direct current voltage relative to a reference direct current voltage, and the reference direct current voltage is the direct current voltage output by the alternating current power grid side converter station in a stable state of the flexible direct current power transmission system;
controlling the alternating voltage output by the oil-gas platform side converter station to be reduced according to the alternating voltage adjustment quantity;
when the direct current voltage is lower than the direct current voltage threshold value, calculating an alternating current voltage adjustment amount, including:
calculating a difference value between the direct current voltage and a reference direct current voltage based on a preset reference direct current voltage;
and converting the difference value to obtain the alternating voltage adjustment quantity.
2. The fault ride-through method according to claim 1, wherein the ac voltage adjustment amount is calculated by the following formula:
△V＝K M (V dcref -V dc )
wherein DeltaV represents the AC voltage adjustment amount, K M Represents the gain factor, (V) dcref -V dc ) Representing the difference between the reference DC voltage and the actual DC voltage, V dcref Representing a reference DC voltage, V dc Representing the actual dc voltage.
3. The fault ride-through method of claim 2, further comprising:
when the direct current voltage is not lower than the direct current voltage threshold, controlling the oil-gas platform side converter station to output alternating current voltage according to a preset reference alternating current voltage, wherein the reference alternating current voltage is the alternating current voltage output by the oil-gas platform side converter station in a stable state of the flexible direct current transmission system.
4. The fault ride-through method according to claim 3, further comprising, after controlling the ac voltage output from the oil-gas platform side converter station to be reduced by the ac voltage adjustment amount:
calculating a recovery adjustment amount;
and controlling the alternating current voltage output by the oil-gas platform side converter station to step up according to the recovery adjustment quantity.
5. The fault-ride-through method of claim 4, wherein the calculating the recovery adjustment amount comprises:
re-detecting the current direct-current voltage of the oil-gas platform converter station;
calculating a difference between the direct current voltage and the current direct current voltage based on the direct current voltage and the current direct current voltage;
and converting by utilizing the difference value between the direct current voltage and the current direct current voltage to obtain the recovery adjustment quantity.
6. The fault-ride-through method according to claim 5, further comprising, after the step-up of the ac voltage output by the control oil-gas platform-side converter station by the recovery adjustment amount, the step-up of the ac voltage:
and after the fault is completely cleared, controlling the alternating voltage output by the oil-gas platform side converter station to step up to the reference alternating voltage.
7. A fault ride through device for a flexible direct current transmission system for oil and gas platform power supply, the flexible direct current transmission system comprising an ac grid side converter station and an oil and gas platform side converter station and a direct current cable connecting the two converter stations, the fault ride through device comprising:
the detection module is used for detecting the direct-current voltage of the oil-gas platform converter station;
the judging module is used for judging whether the direct-current voltage is lower than a preset direct-current voltage threshold value or not;
the calculation module is used for calculating an alternating voltage adjustment quantity when the direct voltage is lower than the direct voltage threshold value, wherein the alternating voltage adjustment quantity is adaptive to the change quantity of the direct voltage relative to a reference direct voltage, and the reference direct voltage is the direct voltage output by the alternating current power grid side converter station in a stable state of the flexible direct current transmission system;
the control module is used for controlling the alternating voltage output by the oil-gas platform side converter station to be reduced according to the alternating voltage adjustment quantity;
the calculation module is further used for calculating the difference value between the direct current voltage and the reference direct current voltage based on a preset reference direct current voltage; and converting the difference value to obtain the alternating voltage adjustment quantity.
8. A fault ride-through device, comprising: a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the fault ride-through method of any of claims 1-6.
9. A non-transitory computer readable storage medium storing computer instructions which, when executed by a processor, implement the fault ride-through method of any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111667691.7A CN114285067B (en) | 2021-12-31 | 2021-12-31 | Fault ride-through method and device and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111667691.7A CN114285067B (en) | 2021-12-31 | 2021-12-31 | Fault ride-through method and device and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114285067A CN114285067A (en) | 2022-04-05 |
| CN114285067B true CN114285067B (en) | 2024-01-16 |
Family
ID=80879552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111667691.7A Active CN114285067B (en) | 2021-12-31 | 2021-12-31 | Fault ride-through method and device and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114285067B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451401A (en) * | 2016-05-16 | 2017-02-22 | 浙江大学 | Control method of maximum power output of converter when DC voltage drops |
| WO2018040466A1 (en) * | 2016-08-27 | 2018-03-08 | 许继集团有限公司 | Direct-current fault ride-through method and computer storage medium |
| CN112018801A (en) * | 2020-08-06 | 2020-12-01 | 江苏省电力试验研究院有限公司 | Receiving-end cascade hybrid direct current coordination control method based on dynamic amplitude limiting |
| CN112421669A (en) * | 2020-12-10 | 2021-02-26 | 南方电网科学研究院有限责任公司 | Alternating current fault ride-through method and system for offshore wind power through flexible direct current transmission |
-
2021
- 2021-12-31 CN CN202111667691.7A patent/CN114285067B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451401A (en) * | 2016-05-16 | 2017-02-22 | 浙江大学 | Control method of maximum power output of converter when DC voltage drops |
| WO2018040466A1 (en) * | 2016-08-27 | 2018-03-08 | 许继集团有限公司 | Direct-current fault ride-through method and computer storage medium |
| CN112018801A (en) * | 2020-08-06 | 2020-12-01 | 江苏省电力试验研究院有限公司 | Receiving-end cascade hybrid direct current coordination control method based on dynamic amplitude limiting |
| CN112421669A (en) * | 2020-12-10 | 2021-02-26 | 南方电网科学研究院有限责任公司 | Alternating current fault ride-through method and system for offshore wind power through flexible direct current transmission |
Non-Patent Citations (5)
| Title |
|---|
| 一种基于功率转移系数的交直流混联受端电网切负荷方案配置方法;陈湘;凌卫家;宋云亭;邓晖;华文;;中国电力(05);全文 * |
| 向无源网络供电的MMC-HVDC送端交流故障穿越策略;肖亮;徐政;刘昇;安婷;孔明;;电工技术学报(15);第89-98页 * |
| 海上平台柔性直流换流站工程应用方案研究;郝为瀚;;南方能源建设(01);第66-70页 * |
| 海上油气平台用柔性直流输电系统分析与设计;赵彪;郭宏;平朝春;孙大卫;谢小荣;宋强;;供用电(02);全文 * |
| 考虑柔性直流调控的电磁环网紧急切机方案;欧阳可凤;孙斌;林成;俞秋阳;付俊波;;智慧电力(08);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114285067A (en) | 2022-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4306760B2 (en) | Distributed power supply | |
| EP3796507A1 (en) | Direct-current bus voltage reference value adjustment method and apparatus, and photovoltaic grid-connected inverter | |
| CN102901919B (en) | Double-feedback type induction generating system and self-testing method of active crowbar circuit thereof | |
| CN106950512B (en) | Energy storage converter grid-connected and grid-disconnected characteristic integrated detection system and method | |
| EP3681006A1 (en) | Voltage and current control method and device for direct-current power transmission system | |
| CN104242331A (en) | Extra-high voltage direct current control system suitable for electromechanical transient simulation | |
| CN107482668B (en) | High voltage direct current determines reactive power AC fault restoration methods and device | |
| CN106786737B (en) | A kind of low voltage traversing control method for collecting and distributing type photovoltaic generating system | |
| CN105656071A (en) | Flexible direct-current transmission low-voltage ride-through control method suitable for occasions without communication between double ends | |
| CN104810822A (en) | Control method of micro-grid bidirectional DC/DC (Direct Current/Direct Current) change drooping coefficient | |
| CN111969567B (en) | Series-parallel direct current transmission system receiving end alternating current fault processing method and system | |
| CN106961115B (en) | High-voltage direct-current power transmission system equivalent current voltage source modeling method and model | |
| CN103904678B (en) | The control method of high voltage direct current transmission Shift speed segmentally rate current limiting low-voltage unit | |
| CN107181276A (en) | The method and device that Hybrid HVDC system commutation failure recovers | |
| CN104065077A (en) | Control method of series voltage compensation device | |
| CN104993520A (en) | Frequency converter low-voltage ride-through (LVRT) supporting apparatus based on super capacitor | |
| CN107769247B (en) | RLC load simulation system for anti-islanding detection and control method thereof | |
| CN115589035A (en) | Grid-connected inverter system and low-frequency oscillation suppression method | |
| CN104811025A (en) | Auxiliary converter with multiple protections | |
| CN115276072A (en) | Method, device, terminal and medium for inhibiting subsequent commutation failure of direct current system | |
| CN104734172B (en) | A kind of self-tuning PI control method improving HVDC system suppression commutation failure ability | |
| CN111162562B (en) | Coordinated fault ride-through method suitable for wind power MMC-MTDC system | |
| CN114285067B (en) | Fault ride-through method and device and storage medium | |
| CN104167939B (en) | Method and device for modulating current transformer | |
| CN113541138B (en) | Fan switching method and device suitable for direct-current transmission system mode conversion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |