CN110707738A - Multi-infeed direct-current power transmission system control optimization method and device and storage medium - Google Patents
Multi-infeed direct-current power transmission system control optimization method and device and storage medium Download PDFInfo
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Abstract
The invention discloses a control optimization method, a control optimization device and a storage medium for a multi-feed-in direct current power transmission system, wherein the control optimization method comprises the following steps: calculating a direct current voltage correction coefficient of the feed-in system according to the voltage measured value of the direct current side of each feed-in system and the voltage rated value of the direct current side of each feed-in system; calculating multi-feed-in interaction factors according to the voltage value of the current conversion bus of each direct current system, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition, and acquiring a direct current voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result; when any one feed-in system is in an alternating current fault state, the voltage value of the direct current side of each feed-in system is switched to a direct current voltage setting value until the feed-in system is detected to be in a normal operation state, and the direct current side of each feed-in system operates according to a corresponding voltage rated value, so that the probability of phase change failure of non-fault systems occurring at the same time can be effectively reduced, and the phase change capability and the fault recovery capability of the multi-feed-in direct current transmission system are integrally improved.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution, in particular to a control optimization method and device for a multi-infeed direct-current power transmission system and a storage medium.
Background
With the gradual maturity of direct current transmission technology and the rapid development of Chinese economy, the level of network construction of a power grid is continuously improved. The high-voltage direct-current transmission technology in China starts late but develops rapidly. Since the beginning of the investment and operation of the Zhoushan direct current transmission project in 1987, the research and development of the high-voltage direct current transmission technology in China are improved dramatically, China becomes a country with the direct current transmission project with the highest voltage level, the largest transmission capacity, the farthest transmission distance and the most advanced technical level in the world, and the requirement of power transmission with long distance and large capacity makes the multi-feed direct current transmission inevitable.
The multi-feed direct current is a concentrated drop point multi-circuit direct current line in one area of a receiving-end power grid, which is a necessary result of adopting direct current transmission to transmit power to a load center and has universality. However, due to the characteristic that a plurality of direct current loops fall into the same alternating current power grid in a short distance to enable the direct current loops to have close electrical connection with each other, when an alternating current system fails, the problem of phase change failure of a plurality of direct current transmission lines possibly occurs due to instantaneous voltage drop, power transmission is affected, and unstable operation of the system is caused.
Disclosure of Invention
The embodiment of the invention provides a control optimization method, a control optimization device and a storage medium for a multi-feed-in direct-current power transmission system, which can effectively solve the problem that in the prior art, multiple direct-current power transmission lines are subjected to phase commutation failure in succession, power transmission is influenced, and the system is unstable in operation, and can integrally improve the phase commutation capability and the fault recovery capability of the multi-feed-in direct-current power transmission system, so that the stability of the system can be effectively improved.
An embodiment of the present invention provides a method for controlling and optimizing a multi-infeed direct-current power transmission system, including:
monitoring and acquiring voltage measurement values of the direct current side of each feed-in system and voltage values of the current conversion buses of each direct current system in real time;
calculating a direct-current voltage correction coefficient of each feed-in system according to the voltage measured value of the direct-current side of each feed-in system and the corresponding voltage rated value of the direct-current side of each feed-in system;
calculating multi-feed-in interaction factors according to the voltage value of each direct current system conversion bus, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition, and acquiring a direct current voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result;
and when any one feed-in system is in an alternating current fault state, switching the voltage value of the direct current side of each feed-in system into the direct current voltage setting value until the feed-in system is detected to be in a normal operation state, and then operating the direct current side of each feed-in system according to the corresponding voltage rated value.
As an improvement of the above scheme, the determining whether each multi-feed-in interaction factor satisfies a preset interaction strength condition, and obtaining a dc voltage value of each feed-in system low-voltage current-limiting link according to a determination result specifically includes:
and when judging that each multi-feed-in interaction factor meets the interaction strength condition, respectively applying each direct-current voltage correction coefficient to the direct-current voltage of each feed-in system low-voltage current limiting link, and acquiring the minimum value of the direct-current voltage of the feed-in system low-voltage current limiting link as a first direct-current voltage setting value.
As an improvement of the above scheme, the determining whether each multi-feed-in interaction factor satisfies a preset interaction strength condition, and obtaining a dc voltage value of each feed-in system low-voltage current-limiting link according to a determination result, further includes:
when at least one multi-feed-in interaction factor which does not meet the interaction strength condition is judged to exist in the multi-feed-in interaction factors, removing the direct-current voltage correction coefficient of the feed-in system corresponding to the multi-feed-in interaction factor which does not meet the interaction strength condition;
and respectively applying the residual direct-current voltage correction coefficients of each feed-in system to the direct-current voltage of each feed-in system low-voltage current limiting link, and acquiring the minimum value of the direct-current voltage of each feed-in system low-voltage current limiting link as a second direct-current voltage setting value.
As an improvement of the above scheme, the determining whether each multi-feed interaction factor satisfies a preset interaction strength condition specifically includes:
judging whether the multi-feed-in interaction factor reaches a preset interaction strength threshold value or not; if so, considering the multi-feed-in interaction factor to meet the interaction strength condition; if not, the multi-feed interaction factor is considered not to meet the interaction strength condition.
As an improvement of the above scheme, the calculating a dc voltage correction coefficient of each feed-in system according to a voltage measurement value at a dc side of each feed-in system and a corresponding voltage rated value at the dc side of each feed-in system specifically includes:
calculating the DC voltage correction factor according to formula (1):
wherein k isiA DC voltage correction factor for each of the feed-in systems; u shapediN, n is the number of feed systems, i is 1,2,3,. the voltage measurement on the dc side of each feed system; u shapediNThe rated voltage value of the direct current side of each feed-in system.
Another embodiment of the present invention correspondingly provides a control optimization apparatus for a multi-feed-in dc power transmission system, including:
the data acquisition module is used for monitoring and acquiring voltage measurement values of the direct current sides of the feed-in systems and voltage values of the current conversion buses of the direct current systems in real time;
the calculation module is used for calculating the direct-current voltage correction coefficient of each feed-in system according to the voltage measurement value of the direct-current side of each feed-in system and the corresponding voltage rated value of the direct-current side of each feed-in system;
the judging module is used for calculating multi-feed-in interaction factors according to the voltage value of each direct current system conversion bus, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition or not, and acquiring a direct current voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result;
and the setting module is used for switching the voltage value of the direct current side of each feed-in system to the direct current voltage setting value when any feed-in system is in an alternating current fault state, and operating the direct current side of each feed-in system according to the corresponding voltage rated value after the feed-in system is detected to be in a normal operation state.
As an improvement of the above scheme, the determination module includes a first direct-current voltage setting value acquisition unit;
the first direct-current voltage setting value obtaining unit is configured to, when it is determined that each of the multiple feed-in interaction factors satisfies the interaction strength condition, apply each of the direct-current voltage correction coefficients to a direct-current voltage of each of the feed-in system low-voltage current limiting links, and obtain a minimum value of the direct-current voltage of the feed-in system low-voltage current limiting link as a first direct-current voltage setting value.
As an improvement of the above scheme, the judging module includes a second direct-current voltage setting value obtaining unit and a removing unit;
the removing unit is used for removing the direct-current voltage correction coefficient of the feed-in system corresponding to the multi-feed-in interaction factor which does not meet the interaction strength condition when at least one of the multi-feed-in interaction factors is judged to not meet the interaction strength condition;
the second direct-current voltage setting value obtaining unit is configured to apply the remaining direct-current voltage correction coefficients of each feed-in system to the direct-current voltages of the low-voltage current limiting links of each feed-in system respectively, and obtain a minimum value of the direct-current voltages of the low-voltage current limiting links of the feed-in systems as a second direct-current voltage setting value.
Another embodiment of the present invention provides a control optimization apparatus for a multi-infeed direct-current power transmission system, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement the control optimization method for the multi-infeed direct-current power transmission system according to the above embodiment of the present invention.
Another embodiment of the present invention provides a storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the method for controlling and optimizing a multi-infeed direct-current power transmission system according to the above embodiment of the present invention.
Compared with the prior art, the method for controlling and optimizing the multi-feed-in direct-current transmission system comprises the steps of monitoring and obtaining a voltage measured value of the direct-current side of each feed-in system and a voltage value of a commutation bus of each direct-current system in real time, calculating a direct-current voltage correction coefficient of each feed-in system according to the voltage measured value of the direct-current side of each feed-in system and a voltage rated value of the direct-current side of each corresponding feed-in system, calculating multi-feed-in interaction factors according to the voltage value of the commutation bus of each direct-current system, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition, obtaining a direct-current voltage set value of a low-voltage current limiting link of each feed-in system according to a judgment result, and switching the voltage value of the direct-current side of each feed-in system into the direct-current voltage set value when any feed-in system is in an alternating-current, and after the feed-in systems are detected to be in a normal operation state, the direct current side of each feed-in system operates according to the corresponding voltage rated value. The phase change failure probability of the non-fault system is reduced by quickly adjusting the non-fault feed-in system in the moment of the fault occurrence of the feed-in system, and then the non-fault system carries out certain electrical support on the fault system, so that the problem that in the prior art, multiple direct current transmission lines successively have phase change failure, power transmission is influenced, and the system is unstable in operation can be effectively solved, the phase change capability and the fault recovery capability of the multiple feed-in direct current transmission system are integrally improved, and the stability of the system can be effectively improved.
Drawings
Fig. 1 is a schematic flowchart of a control optimization method for a multi-feed-in dc power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control optimization apparatus for a multi-feed-in dc power transmission system according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a schematic flowchart of a control optimization method for a multi-feed-in dc power transmission system according to an embodiment of the present invention is shown, where the method includes steps S101 to S104.
And S101, monitoring and obtaining voltage measurement values of the direct current side of each feed-in system and voltage values of the current conversion buses of each direct current system in real time.
And S102, calculating a direct current voltage correction coefficient of each feed-in system according to the voltage measured value of the direct current side of each feed-in system and the corresponding voltage rated value of the direct current side of each feed-in system.
In an alternative embodiment, the dc voltage correction factor is calculated according to equation (1):
wherein k isiA DC voltage correction factor for each of the feed-in systems; u shapediN, n is the number of feed systems, i is 1,2,3,. the voltage measurement on the dc side of each feed system; u shapediNThe rated voltage value of the direct current side of each feed-in system.
S103, according to the voltage value of each direct current system conversion bus, calculating a multi-feed-in interaction factor, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition, and obtaining a direct current voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result.
In an optional embodiment, the determining whether each multi-feed interaction factor satisfies a preset interaction strength condition specifically includes:
judging whether the multi-feed-in interaction factor reaches a preset interaction strength threshold value or not; if so, considering the multi-feed-in interaction factor to meet the interaction strength condition; if not, the multi-feed interaction factor is considered not to meet the interaction strength condition.
It should be noted that, according to the formula, the voltage value of the commutation bus of each dc system obtained in step S101
A multi-feed interaction factor is calculated. And further respectively judging the voltage interaction strength of the direct current system commutation bus according to the multi-feed-in interaction factors.
Optionally, when it is determined that each of the multiple feed-in interaction factors satisfies the interaction strength condition, each of the dc voltage correction coefficients is applied to the dc voltage of each of the feed-in system low-voltage current-limiting links, and a minimum value of the dc voltage of the feed-in system low-voltage current-limiting link is obtained as a first dc voltage setting value.
Optionally, when it is determined that at least one of the multiple feed-in interaction factors does not satisfy the interaction strength condition, removing the dc voltage correction coefficient of the feed-in system corresponding to the multiple feed-in interaction factor that does not satisfy the interaction strength condition;
and respectively applying the residual direct-current voltage correction coefficients of each feed-in system to the direct-current voltage of each feed-in system low-voltage current limiting link, and acquiring the minimum value of the direct-current voltage of each feed-in system low-voltage current limiting link as a second direct-current voltage setting value.
It should be noted that, when the multi-feed-in interaction factor MIIF between the two systems is smaller than the preset interaction strength threshold, the dc voltage correction coefficient between the two systems is omitted, so as to avoid over-correction, and ensure the transmission capacity of the system to the maximum extent while ensuring the successful phase change of the system.
In this embodiment, the first dc voltage setting value or the second dc voltage setting value is represented by Udjmin＝min(ki*Udj)。
And S104, when any one feed-in system is in an alternating current fault state, switching the voltage value of the direct current side of each feed-in system into the direct current voltage setting value until the direct current side of each feed-in system runs according to the corresponding voltage rated value after the feed-in system is detected to be in a normal running state.
It should be noted that when the ith feeding system has an ac fault, the dc voltage must be first reduced, ki is smaller than 1, and is the minimum value, and is applied to the low-voltage current-limiting link U of the jth feeding systemdj＝UdjminThe low-voltage current limiting link rapidly acts to limit the rise of direct current, maintain the phase change stability of the non-fault system j, and simultaneously the non-fault system plays a certain supporting role in the phase change of the fault system to realize rapid recovery of the fault. Further, when the system recovers to a normal operation state, all voltages fed into the direct current side of the system are switched to the voltage rated value, at the moment, the direct current voltage correction coefficient ki is 1, the correction coefficient does not act on the low-voltage current conversion link, and the current voltage is converted into the direct current voltage rated valueThe system is in an initial control state.
The embodiment of the invention provides a multi-feed-in direct current transmission system control optimization method, which comprises the steps of monitoring and obtaining a voltage measurement value of a direct current side of each feed-in system and a voltage value of a commutation bus of each direct current system in real time, calculating a direct current voltage correction coefficient of each feed-in system according to the voltage measurement value of the direct current side of each feed-in system and a voltage rated value of the direct current side of each corresponding feed-in system, calculating multi-feed-in interaction factors according to the voltage value of the commutation bus of each direct current system, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition or not, obtaining a direct current voltage setting value of a low-voltage current limiting link of each feed-in system according to a judgment result, and switching the voltage value of the direct current side of each feed-in system into the direct current voltage setting value when any feed-in system is in an alternating current fault state, and after the feed-in systems are detected to be in a normal operation state, the direct current side of each feed-in system operates according to the corresponding voltage rated value. The phase change failure probability of the non-fault system is reduced by quickly adjusting the non-fault feed-in system in the moment of the fault occurrence of the feed-in system, and then the non-fault system carries out certain electrical support on the fault system, so that the problem that in the prior art, multiple direct current transmission lines successively have phase change failure, power transmission is influenced, and the system is unstable in operation can be effectively solved, the phase change capability and the fault recovery capability of the multiple feed-in direct current transmission system are integrally improved, and the stability of the system can be effectively improved.
Example two
Referring to fig. 2, a schematic structural diagram of a control optimization apparatus for a multi-feed-in dc power transmission system according to a second embodiment of the present invention includes:
the data acquisition module 201 is configured to monitor and acquire a voltage measurement value at a dc side of each feed-in system and a voltage value of a commutation bus of each dc system in real time;
a calculating module 202, configured to calculate a dc voltage correction coefficient of each feed-in system according to a voltage measurement value at a dc side of each feed-in system and a voltage rated value at the dc side of each corresponding feed-in system;
the judging module 203 is configured to calculate multiple feed-in interaction factors according to the voltage value of each dc system commutation bus, judge whether each multiple feed-in interaction factor meets a preset interaction strength condition, and obtain a dc voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result;
the setting module 204 is configured to switch a voltage value at a dc side of each feed-in system to the dc voltage setting value when any feed-in system is in an ac fault state, until the dc side of each feed-in system operates according to the corresponding voltage rating after the feed-in system is detected to be in a normal operation state.
Preferably, the judging module 203 includes a first direct-current voltage setting value obtaining unit;
the first direct-current voltage setting value obtaining unit is configured to, when it is determined that each of the multiple feed-in interaction factors satisfies the interaction strength condition, apply each of the direct-current voltage correction coefficients to a direct-current voltage of each of the feed-in system low-voltage current limiting links, and obtain a minimum value of the direct-current voltage of the feed-in system low-voltage current limiting link as a first direct-current voltage setting value.
Preferably, the judging module 203 includes a second dc voltage setting value obtaining unit and a removing unit;
the removing unit is used for removing the direct-current voltage correction coefficient of the feed-in system corresponding to the multi-feed-in interaction factor which does not meet the interaction strength condition when at least one of the multi-feed-in interaction factors is judged to not meet the interaction strength condition;
the second direct-current voltage setting value obtaining unit is configured to apply the remaining direct-current voltage correction coefficients of each feed-in system to the direct-current voltages of the low-voltage current limiting links of each feed-in system respectively, and obtain a minimum value of the direct-current voltages of the low-voltage current limiting links of the feed-in systems as a second direct-current voltage setting value.
Preferably, the judging module 203 further includes:
a condition determining unit, configured to determine whether each multi-feed-in interaction factor satisfies a preset interaction strength condition, specifically including:
judging whether the multi-feed-in interaction factor reaches a preset interaction strength threshold value or not; if so, considering the multi-feed-in interaction factor to meet the interaction strength condition; if not, the multi-feed interaction factor is considered not to meet the interaction strength condition.
Preferably, the calculation module 202 includes:
a dc voltage correction coefficient calculation unit for calculating the dc voltage correction coefficient according to formula (1):
wherein k isiFor each of said feed-in systems a DC voltage correction factor, UdiFor the voltage measurement on the DC side of each of the feed-in systems, UdNThe voltage rating on the dc side of each feed system.
The multi-infeed direct-current power transmission system control optimization apparatus provided in this embodiment is configured to perform the steps of the multi-infeed direct-current power transmission system control optimization method in any one of the above embodiments, and working principles and beneficial effects of the two are in one-to-one correspondence, so that details are not repeated.
The second control optimization device for the multi-feed-in direct-current power transmission system in the embodiment of the invention comprises: a processor, a memory, and a computer program, such as a multi-feed dc power transmission system control optimization program, stored in the memory and executable on the processor. The processor, when executing the computer program, implements the steps in each of the above-mentioned embodiments of the multi-infeed dc power transmission system control optimization method, for example, step S104 shown in fig. 1. Alternatively, the processor, when executing the computer program, implements the functions of the modules/units in the above-described apparatus embodiments, such as tuning the modules.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the multi-infeed dc power transmission system control optimization apparatus.
The multi-feed-in direct current transmission system control optimization device can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The multi-feed direct current power transmission system control optimization device can comprise, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the schematic diagram is merely an example of the multi-feed dc power transmission system control optimization device, and does not constitute a limitation of the multi-feed dc power transmission system control optimization device, and may include more or less components than those shown, or combine some components, or different components, for example, the multi-feed dc power transmission system control optimization device may further include input and output devices, network access devices, buses, and the like.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor is a control center of the multi-feed dc power transmission system control optimization device, and various interfaces and lines are used to connect various parts of the whole multi-feed dc power transmission system control optimization device.
The memory may be configured to store the computer program and/or module, and the processor may implement various functions of the multi-infeed dc power transmission system control optimization apparatus by executing or executing the computer program and/or module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the modules/units integrated by the multi-feed-in direct current transmission system control optimization device can be stored in a computer readable storage medium if the modules/units are realized in the form of software functional units and sold or used as independent products. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A control optimization method for a multi-feed-in direct current transmission system is characterized by comprising the following steps:
monitoring and acquiring voltage measurement values of the direct current side of each feed-in system and voltage values of the current conversion buses of each direct current system in real time;
calculating a direct-current voltage correction coefficient of each feed-in system according to the voltage measured value of the direct-current side of each feed-in system and the corresponding voltage rated value of the direct-current side of each feed-in system;
calculating multi-feed-in interaction factors according to the voltage value of each direct current system conversion bus, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition, and acquiring a direct current voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result;
and when any one feed-in system is in an alternating current fault state, switching the voltage value of the direct current side of each feed-in system into the direct current voltage setting value until the feed-in system is detected to be in a normal operation state, and then operating the direct current side of each feed-in system according to the corresponding voltage rated value.
2. The method according to claim 1, wherein the determining whether each multi-feed-in interaction factor satisfies a preset interaction strength condition and obtaining a dc voltage value of each feed-in system low-voltage current-limiting link according to a determination result specifically comprises:
and when judging that each multi-feed-in interaction factor meets the interaction strength condition, respectively applying each direct-current voltage correction coefficient to the direct-current voltage of each feed-in system low-voltage current limiting link, and acquiring the minimum value of the direct-current voltage of the feed-in system low-voltage current limiting link as a first direct-current voltage setting value.
3. The method according to claim 1, wherein the determining whether each multi-feed-in interaction factor satisfies a predetermined interaction strength condition and obtaining a dc voltage value of each feed-in system low-voltage current-limiting link according to a determination result further comprises:
when at least one multi-feed-in interaction factor which does not meet the interaction strength condition is judged to exist in the multi-feed-in interaction factors, removing the direct-current voltage correction coefficient of the feed-in system corresponding to the multi-feed-in interaction factor which does not meet the interaction strength condition;
and respectively applying the residual direct-current voltage correction coefficients of each feed-in system to the direct-current voltage of each feed-in system low-voltage current limiting link, and acquiring the minimum value of the direct-current voltage of each feed-in system low-voltage current limiting link as a second direct-current voltage setting value.
4. The method according to claim 1, wherein the determining whether each multi-feed-in interaction factor satisfies a predetermined interaction strength condition specifically comprises:
judging whether the multi-feed-in interaction factor reaches a preset interaction strength threshold value or not; if so, considering the multi-feed-in interaction factor to meet the interaction strength condition; if not, the multi-feed interaction factor is considered not to meet the interaction strength condition.
5. The method according to claim 1, wherein the calculating the dc voltage correction factor of each feeding system according to the voltage measurement value of the dc side of each feeding system and the corresponding voltage rated value of the dc side of each feeding system comprises:
calculating the DC voltage correction factor according to formula (1):
wherein k isiA DC voltage correction factor for each of the feed-in systems; u shapediFor the voltage measurement value on the dc side of each feed system, i is 1,2,3, … … n, n is the number of feed systems; u shapediNThe rated voltage value of the direct current side of each feed-in system.
6. A multi-infeed dc transmission system control optimization apparatus, comprising:
the data acquisition module is used for monitoring and acquiring voltage measurement values of the direct current sides of the feed-in systems and voltage values of the current conversion buses of the direct current systems in real time;
the calculation module is used for calculating the direct-current voltage correction coefficient of each feed-in system according to the voltage measurement value of the direct-current side of each feed-in system and the corresponding voltage rated value of the direct-current side of each feed-in system;
the judging module is used for calculating multi-feed-in interaction factors according to the voltage value of each direct current system conversion bus, judging whether each multi-feed-in interaction factor meets a preset interaction strength condition or not, and acquiring a direct current voltage setting value of each feed-in system low-voltage current limiting link according to a judgment result;
and the setting module is used for switching the voltage value of the direct current side of each feed-in system to the direct current voltage setting value when any feed-in system is in an alternating current fault state, and operating the direct current side of each feed-in system according to the corresponding voltage rated value after the feed-in system is detected to be in a normal operation state.
7. The multi-infeed direct current transmission system control optimization apparatus according to claim 6, wherein the determination module includes a first direct current voltage setting value acquisition unit;
the first direct-current voltage setting value obtaining unit is configured to, when it is determined that each of the multiple feed-in interaction factors satisfies the interaction strength condition, apply each of the direct-current voltage correction coefficients to a direct-current voltage of each of the feed-in system low-voltage current limiting links, and obtain a minimum value of the direct-current voltage of the feed-in system low-voltage current limiting link as a first direct-current voltage setting value.
8. The multi-infeed direct-current transmission system control optimization apparatus according to claim 6, wherein the determination module includes a second direct-current voltage setting value obtaining unit and a removal unit;
the removing unit is used for removing the direct-current voltage correction coefficient of the feed-in system corresponding to the multi-feed-in interaction factor which does not meet the interaction strength condition when at least one of the multi-feed-in interaction factors is judged to not meet the interaction strength condition;
the second direct-current voltage setting value obtaining unit is configured to apply the remaining direct-current voltage correction coefficients of each feed-in system to the direct-current voltages of the low-voltage current limiting links of each feed-in system respectively, and obtain a minimum value of the direct-current voltages of the low-voltage current limiting links of the feed-in systems as a second direct-current voltage setting value.
9. A multi-infeed dc power transmission system control optimization apparatus comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the multi-infeed dc power transmission system control optimization method of any one of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for multi-infeed dc power transmission system control optimization according to any one of claims 1 to 5.
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