CN111817332A - Method and device for power coordination control of direct current transmission system and storage medium - Google Patents

Method and device for power coordination control of direct current transmission system and storage medium Download PDF

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CN111817332A
CN111817332A CN202010453771.1A CN202010453771A CN111817332A CN 111817332 A CN111817332 A CN 111817332A CN 202010453771 A CN202010453771 A CN 202010453771A CN 111817332 A CN111817332 A CN 111817332A
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current
station
reference value
value
rate
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CN111817332B (en
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李成翔
郭琦
廖梦君
邓丽君
黄立滨
苏明章
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CSG Electric Power Research Institute
Research Institute of Southern Power Grid Co Ltd
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Research Institute of Southern Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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]

Abstract

The invention discloses a method, a device and a storage medium for power coordination control of a direct current transmission system, wherein the method comprises the following steps: when the three-terminal direct-current power transmission system is in a first-to-second mode, acquiring a current reference value and a current lifting rate of a rectifying station, and acquiring a current reference value and a current lifting rate of a first inverter station; if the current reference value of the rectifier station and the current reference value of the first inverter station change simultaneously, acquiring the current value of the rectifier station and the current value of the first inverter station; determining the current lifting rate of the first inversion station according to the current lifting rate, the current value and the changed current reference value of the rectification station, and the current value and the changed current reference value of the first inversion station; and if only the current lifting speed of the first inversion station is changed, adjusting the current lifting speed to be the changed current lifting speed. The invention can automatically refresh and determine the current lifting rate of the first inverter station, thereby enabling the three converter stations to simultaneously reach the set reference value.

Description

Method and device for power coordination control of direct current transmission system and storage medium
Technical Field
The invention relates to the technical field of direct current fault control, in particular to a method and a device for power coordination control of a direct current transmission system and a storage medium.
Background
When the three-terminal dc transmission system is composed of one rectifying station and two inverter stations, generally, the rectifying station and the first inverter station control dc current, and the second inverter station controls dc voltage. In the prior art, when the current rate reference value of a first inverter station in a three-terminal direct-current transmission system is set, the parameters of the first inverter station can be directly changed into set values, and the problem existing in the setting mode is that: if the set value is not reasonable, the lifting process of the three-station current can be abnormal.
Disclosure of Invention
In view of the foregoing problems, an object of the embodiments of the present invention is to provide a method, an apparatus, and a storage medium for power coordination control of a dc power transmission system, wherein different manners are selected to determine a current increase/decrease rate of a first inverter station according to different power control requirements, so that three converter stations simultaneously reach a set reference value, and the dc power transmission system operates more stably.
To achieve the above object, an embodiment of the present invention provides a method for power coordination control of a dc power transmission system, including the following steps:
when the three-terminal direct-current power transmission system is in a first-to-second mode, acquiring a current reference value and a current lifting rate of a rectifying station, and acquiring a current reference value and a current lifting rate of a first inverter station;
if the current reference value of the rectifying station and the current reference value of the first inverter station change simultaneously, acquiring the current value of the rectifying station and the current value of the first inverter station;
determining the current lifting rate of the first inversion station according to the current lifting rate, the current value and the changed current reference value of the rectification station, and the current value and the changed current reference value of the first inversion station;
and if only the current lifting rate of the first inversion station changes, adjusting the current lifting rate of the first inversion station to the changed current lifting rate.
Preferably, the determining the current increasing and decreasing rate of the first inverter station according to the current increasing and decreasing rate of the rectifier station, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station specifically includes:
substituting the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station into a formula
Figure BDA0002508225940000021
Obtaining the current lifting rate of the first inverter station; wherein, I_Ramp_BIs the current rise and fall rate, I, of the first inverter station_REF_BIs a changed current reference value, I, of the first inverter station_Act_BIs the current value of the first inverter station, I_Ramp_AIs the current rise and fall rate of the commutation station, I_REF_AIs a changed current reference value, I, of the rectifier station_Act_AIs the current value of the commutation station.
Preferably, the method further comprises:
the second inverter station implements a constant voltage control strategy.
Preferably, the second inverter station executes a constant-voltage control strategy, which specifically includes:
the voltage of the second inversion station is maintained at a preset constant value, the current value of the second inversion station is the difference between the current value of the rectification station and the current value of the first inversion station, and the current rising and falling rate of the second inversion station is the difference between the current rising and falling rate of the rectification station and the current rising and falling rate of the first inversion station.
Another embodiment of the present invention provides an apparatus for power coordination control of a dc power transmission system, where the apparatus includes:
the first data acquisition module is used for acquiring a current reference value and a current lifting rate of the rectifying station and acquiring a current reference value and a current lifting rate of the first inverter station when the three-terminal direct-current power transmission system is in a first-to-second mode;
the second data acquisition module is used for acquiring the current value of the rectifying station and the current value of the first inverter station if the current reference value of the rectifying station and the current reference value of the first inverter station change simultaneously;
the first current rate adjusting module is used for determining the current lifting rate of the first inverter station according to the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station;
and the second current rate adjusting module is used for adjusting the current lifting rate of the first inversion station to the changed current lifting rate if only the current lifting rate of the first inversion station changes.
Yet another embodiment of the present invention provides an apparatus using a method for power coordination control of a dc 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 method for power coordination control of a dc power transmission system according to any one of the above.
Yet another embodiment of the present invention provides 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 of dc power transmission system power coordination control according to any one of the above.
Compared with the prior art, the method, the device and the storage medium for power coordination control of the direct current transmission system provided by the embodiment of the invention can be used for adjusting the current lifting rate of the first inverter station differently according to different power control requirements, so that the three converter stations can reach set values more effectively and stably, and the direct current transmission system can run more safely.
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Fig. 1 is a schematic flow chart of a method for power coordination control of a dc power transmission system according to an embodiment of the present invention;
fig. 2 is a simplified flow diagram of a method for power coordination control of a dc power transmission system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a three-terminal dc power transmission system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for power coordination control of a dc power transmission system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an apparatus using a method for power coordination control of a dc power transmission system according to an 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.
Referring to fig. 1, a flow chart of a method for power coordination control of a dc power transmission system according to the embodiment of the present invention is shown, where the method includes steps S1 to S4:
s1, when the three-terminal direct-current power transmission system is in a first-to-second mode, acquiring a current reference value and a current lifting rate of the rectifying station, and acquiring a current reference value and a current lifting rate of the first inverter station;
s2, if the current reference value of the rectifier station and the current reference value of the first inverter station change simultaneously, acquiring the current value of the rectifier station and the current value of the first inverter station;
s3, determining the current lifting rate of the first inverter station according to the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station;
and S4, if only the current lifting speed of the first inversion station changes, adjusting the current lifting speed of the first inversion station to the changed current lifting speed.
For convenience of understanding, refer to fig. 2, which is a simplified flowchart of a method for power coordination control of a dc power transmission system according to the embodiment of the present invention, and the implementation process of the present invention can be understood more intuitively from fig. 2.
It should be noted that the method of the present invention is mainly directed to a case where the three-terminal dc power transmission system is in a first-to-two-receive operation mode, that is, the three-terminal dc power transmission system is composed of a rectifying station and two inverter stations, that is, a current is converted into a dc power by an ac system in which the rectifying station is located through the rectifying station, and then transmitted to the first inverter station and the second inverter station, and then converted into an ac power by the first inverter station and the second inverter station, and respectively transmitted to the ac system of the first inverter station and the second inverter station.
Specifically, when the three-terminal direct-current power transmission system is in a first-to-second mode, the current reference value and the current lifting rate of the rectifying station are obtained, and the current reference value and the current lifting rate of the first inverter station are obtained. The data of the rectifying station and the first inversion station are obtained because the current value and the current rising and falling rate of the first inversion station are determined by the current value and the current rising and falling rate of the rectifying station and the first inversion station.
If the current reference value of the rectifying station and the current reference value of the first inverter station change simultaneously, it is indicated that the transmission power of the direct current transmission system changes, the current target value of the rectifying station and the current target value of the first inverter station change, and at this time, the current value of the rectifying station and the current value of the first inverter station need to be obtained.
And determining the current lifting rate of the first inversion station according to the current lifting rate, the current value and the changed current reference value of the rectification station, and the current value and the changed current reference value of the first inversion station. Therefore, the first inverter station can be prevented from being adjusted at the original current lifting rate, and the changed current reference value can be effectively and quickly reached.
If only the current lifting rate of the first inversion station changes, the current lifting rate of the first inversion station is adjusted to be the changed current lifting rate. In this case, only the current rising and falling rate of the first inverter station changes, and the current reference value of the rectifier station and the current reference value of the first inverter station do not change, so that only the current rising and falling rate of the first inverter station needs to be updated to a change value.
According to the method for power coordination control of the direct current transmission system provided by the embodiment 1 of the invention, the current lifting rate of the first inverter station can be adjusted differently according to different power control requirements, so that three converter stations can reach set values more effectively and smoothly, and the direct current transmission system can run more safely.
As an improvement of the above scheme, the determining the current increasing and decreasing rate of the first inverter station according to the current increasing and decreasing rate of the rectifier station, the current value and the changed current reference value, and the current value and the changed current reference value of the first inverter station specifically includes:
substituting the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station into a formula
Figure BDA0002508225940000061
Obtaining the current lifting rate of the first inverter station; wherein, I_Ramp_BIs the current rise and fall rate, I, of the first inverter station_REF_BIs the first inverseCurrent reference value after station change, I_Act_BIs the current value of the first inverter station, I_Ramp_AIs the current rise and fall rate of the commutation station, I_REF_AIs a changed current reference value, I, of the rectifier station_Act_AIs the current value of the commutation station.
Concretely, the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station are substituted into a formula
Figure BDA0002508225940000062
Obtaining the current lifting rate of the first inverter station; wherein, I_Ramp_BIs the current rise and fall rate of the first inverter station, I_REF_BIs a changed current reference value, I, of the first inverter station_Act_BIs the current value of the first inverter station, I_Ramp_AFor the current rise and fall rate of the commutation station, I_REF_AFor a changed current reference value of the rectifier station, I_Act_AIs the current value of the commutation station.
Generally, the current of the rectifying station climbs from zero at the current rising and falling rate thereof, and finally reaches the current reference value of the rectifying station, but during the climbing process, the current value of the rectifying station is changed, so a real-time value is obtained. Similarly, the current of the first inversion station climbs at the current ascending and descending rate from zero, and finally reaches the current reference value of the first inversion station, and the current value of the first inversion station changes in the climbing process. Therefore, the current lifting rate of the first inversion station also changes from moment to moment, and the method can be more suitable for the coordinated control of the power lifting rate of the direct-current transmission system.
As an improvement of the above scheme, the method further comprises:
the second inverter station implements a constant voltage control strategy.
Specifically, the second inverter station implements a constant voltage control strategy. Meanwhile, a constant current control strategy is executed by the rectifying station, and a current reference value and a current lifting speed can be set; the second inverter station executes a constant current control strategy, and can set a current reference value and a current lifting speed. And the second inverter station executes a constant-voltage control strategy, and the current reference value and the current lifting speed of the second inverter station cannot be set.
As an improvement of the above scheme, the second inverter station executes a constant voltage control strategy, which specifically includes:
the voltage of the second inversion station is maintained at a preset constant value, the current value of the second inversion station is the difference between the current value of the rectification station and the current value of the first inversion station, and the current rising and falling rate of the second inversion station is the difference between the current rising and falling rate of the rectification station and the current rising and falling rate of the first inversion station.
Specifically, the voltage of the second inverter station is maintained at a preset constant value, the current value of the second inverter station is the difference between the current value of the rectifier station and the current value of the first inverter station, and the current rising and falling rate of the second inverter station is the difference between the current rising and falling rate of the rectifier station and the current rising and falling rate of the first inverter station.
Therefore, if the current reference values of the rectifier station and the first inverter station are changed, the current rise and fall rate of the second inverter station can be changed into the following two conditions:
case 1:
Figure BDA0002508225940000071
in the above formula, the current rise and fall rate of the rectifier station is I_Ramp_AThe current lifting rate of the first inversion station is I_Ramp_BThe current reference value of the rectifier station is I_REF_AThe current reference value of the first inverter station is I_REF_B。
The current rise and fall condition of a three-terminal dc transmission system can be divided into two phases,
the first stage is as follows: rectifying the current of the station with I_Ramp_AAt a rate of rise, the current of the first inverter station being at I_Ramp_BAt a rate of rise, the current of the second inverter station being at I_Ramp_A-I_Ramp_BIs ramped up. The first inverter station is first raised to a reference value I_REF_BAnd keeping unchanged, wherein the current of the rectifying station and the current of the second inverter station are still in the rising process.
And a second stage: rectifying the current of the station with I_Ramp_AIs increased, the current of the first inversion station is kept constant, and the current of the second inversion station is I_Ramp_AIs ramped up. The rectifier station rises to a reference value I_REF_AWhen the current of the rectifier station and the current of the second inverter station rise and fall, the current of the second inverter station rises to I_REF_A-I_REF_B。
The current lifting process of the second inversion station is divided into two sections, and the current lifting speed of the second section is greater than that of the first section.
Case 2:
Figure BDA0002508225940000081
the first stage is as follows: rectifying the current of the station with I_Ramp_AAt a rate of rise, the current of the first inverter station being at I_Ramp_BAt a rate of rise, the current of the second inverter station being at I_Ramp_A-I_Ramp_BIs ramped up. The rectifier station is first raised to a reference value I_REF_AAnd keeping unchanged, wherein the current of the first inverter station and the current of the second inverter station are still in the rising process, and the current of the first inverter station is smaller than I_REF_BThe current of the second inverter station is greater than I_REF_A-I_REF_B
And a second stage: the current of the rectifying station is kept constant, and the current of the first inversion station is I_Ramp_BAt a rate of rise, the current of the second inverter station being at I_Ramp_BThe rate of (c) decreases. The first inversion station is raised to a reference value I_REF_BWhen the current of the first inversion station and the current of the second inversion station rise and fall, the current of the second inversion station falls to I_Ramp_A-I_Ramp_B。
The current rise and fall of the second inversion station are divided into two sections, the current rise of the first section exceeds I_REF_A-I_REF_BThe second stage is a descending process, reducing to I_REF_A-I_REF_B。
In addition, in order to further improve the technical solution of the present invention, the embodiment of the present invention further provides a method for determining an operation mode of a three-terminal dc power transmission system, see fig. 3, which is a schematic diagram of the three-terminal dc power transmission system provided in the embodiment of the present invention, and the station B is determined to be in rectification or inversion according to a position of the polarity transfer switch, so that it can be determined whether an operation state of the three-terminal dc power transmission system is in a two-to-one mode or a one-to-two mode, when the operation state of the three-terminal dc power transmission system is in the two-to-one mode, the switches 2 and 3 are in an on position, and the switches 1 and 4 are in an off position; when the running state of the three-terminal direct-current power transmission system is in a first-sending-two mode, the switches 1 and 4 are in closed positions, the switches 2 and 3 are in separated positions, and then a coordination control mode is selected.
When the system is in a two-sending-one mode in steady state operation, the power control strategy is as follows: the station A and the station B are rectifier stations, the control modes are both current/power control, the direct current power/direct current of each converter station can be controlled to reach a reference value set by an operator, the station C controls the voltage, and the current reference value is the station A current reference value plus the station B reference value; when the system is in a first-sending-two mode in steady state operation, the power control strategy is as follows: station A is a rectifier station, the control mode is current/power control, station B is an inverter station, the control mode is current/power control, station A and station B can control the direct current power/direct current of the respective converter stations to reach a reference value set by an operator, and station B controls voltage, and the current reference value is the current reference value of station A minus the current reference value of station B.
The power coordination control method for the system transient state operation in the first-sending-two mode comprises the following steps:
1) single-ended monopolar failure: and the power of the fault sending end is transferred to the opposite pole, the transferred power is firstly restored to the bipolar power level before the fault for the station C, and the redundant power is redistributed to the station B.
2) Unique dead-end bipolar fault: and all three stations stop running.
3) One terminated unipolar fault: the power of the non-fault receiving end is unchanged, the antipole power of the transmitting end is increased, and all the increased power is distributed to the antipole of the fault receiving end.
4) One terminated bipolar fault: and limiting power by the sending end, and keeping the power of the non-fault receiving end unchanged.
The power coordination control method of the system in a transient operation two-sending-one mode comprises the following steps:
1) one send end monopole fault: the bipolar power of the non-fault sending end is kept unchanged, and the power of the fault sending end is transferred to the opposite pole.
2) One send-end bipolar fault: the power of the other transmitting end is kept unchanged, and the only receiving end synchronously follows the power change of the two transmitting ends.
3) Unique terminated unipolar fault: and the power of the three stations is transferred to the opposite pole, the increased power preferentially meets the power before the station A recovers the fault, and if the redundant part is distributed to the station B.
4) Unique terminated bipolar fault: three stations stop running
Referring to fig. 4, a schematic structural diagram of an apparatus for power coordination control of a dc power transmission system according to an embodiment of the present invention is provided, where the apparatus includes:
the first data acquisition module 11 is configured to acquire a current reference value and a current lifting rate of the rectifier station and acquire a current reference value and a current lifting rate of the first inverter station when the three-terminal direct-current power transmission system is in a first-to-second mode;
a second data obtaining module 12, configured to obtain a current value of the rectifying station and a current value of the first inverting station if the current reference value of the rectifying station and the current reference value of the first inverting station change simultaneously;
a first current rate adjusting module 13, configured to determine a current lifting rate of the first inverter station according to the current lifting rate of the rectifier station, the current value, and the changed current reference value, and the current value and the changed current reference value of the first inverter station;
and the second current rate adjusting module 14 is configured to adjust the current lifting rate of the first inverter station to the changed current lifting rate if only the current lifting rate of the first inverter station changes.
The device for power coordination control of a direct current power transmission system according to the embodiment of the present invention can implement all the processes of the method for power coordination control of a direct current power transmission system according to any one of the embodiments, and the functions and technical effects of the modules and units in the device are respectively the same as those of the method for power coordination control of a direct current power transmission system according to the embodiment, and are not described herein again.
Referring to fig. 5, the device of the method for power coordination control of a direct current power transmission system according to the embodiment of the present invention includes a processor 10, a memory 20, and a computer program stored in the memory 20 and configured to be executed by the processor 10, where the processor 10 implements the method for power coordination control of a direct current power transmission system according to any one of the above embodiments when executing the computer program.
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 20 and executed by the processor 10 to implement the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing certain functions, the instruction segments being used to describe the execution of a computer program in a method for coordinated control of power of a dc power transmission system. For example, the computer program may be divided into a first data acquisition module, a second data acquisition module, a first current rate adjustment module, and a second current rate adjustment module, each module having the following specific functions:
the first data acquisition module 11 is configured to acquire a current reference value and a current lifting rate of the rectifier station and acquire a current reference value and a current lifting rate of the first inverter station when the three-terminal direct-current power transmission system is in a first-to-second mode;
a second data obtaining module 12, configured to obtain a current value of the rectifying station and a current value of the first inverting station if the current reference value of the rectifying station and the current reference value of the first inverting station change simultaneously;
a first current rate adjusting module 13, configured to determine a current lifting rate of the first inverter station according to the current lifting rate of the rectifier station, the current value, and the changed current reference value, and the current value and the changed current reference value of the first inverter station;
and the second current rate adjusting module 14 is configured to adjust the current lifting rate of the first inverter station to the changed current lifting rate if only the current lifting rate of the first inverter station changes.
The device using the method for the power coordination control of the direct current transmission system can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The device using the method for power coordination control of the direct current power transmission system can comprise a processor and a memory, but is not limited to the processor and the memory. It will be understood by those skilled in the art that the schematic diagram 5 is merely an example of an apparatus using the method of coordinated power control of a dc power transmission system, and does not constitute a limitation of the apparatus using the method of coordinated power control of a dc power transmission system, and may include more or less components than those shown, or combine certain components, or different components, for example, the apparatus using the method of coordinated power control of a dc power transmission system may further include an input-output device, a network access device, a bus, etc.
The Processor 10 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 purpose processor may be a microprocessor or the processor 10 may be any conventional processor or the like, and the processor 10 is a control center of the apparatus using the method for coordinated control of power of the dc power transmission system, and various interfaces and lines are used to connect various parts of the apparatus using the method for coordinated control of power of the dc power transmission system as a whole.
Memory 20 may be used to store the computer programs and/or modules, and processor 10 may implement the various functions of the apparatus using the method of dc power transmission system power coordination control by running or executing the computer programs and/or modules stored in memory 20, and invoking the data stored in memory 20. The memory 20 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 20 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.
The module integrated by the device using the method for coordinated control of power of the direct current transmission system can be stored in a computer readable storage medium if the module is realized in the form of a software functional unit and sold or used as an independent product. 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 can implement the steps of the embodiments of the method when the computer program is executed by a processor. The computer program includes computer program code, and the computer program code may be in a source code form, an object code form, an executable file or some intermediate form. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. 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 media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the method for power coordination control of a dc power transmission system according to any of the foregoing embodiments.
To sum up, the method, the device and the storage medium for power coordination control of a dc power transmission system according to embodiments of the present invention can automatically calculate and refresh the current increasing/decreasing rate of the first inverter station according to different power control requirements for a three-terminal dc power transmission system in a one-to-two mode, calculate and refresh the current rate of the first inverter station only when the current reference values of the rectifier station and the first inverter station change simultaneously, and set the current increasing/decreasing rate of the first inverter station to refresh to an input value if the current reference values of the rectifier station and the first inverter station do not change simultaneously.
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 (7)

1. A method for power coordination control of a direct current transmission system is characterized by comprising the following steps:
when the three-terminal direct-current power transmission system is in a first-to-second mode, acquiring a current reference value and a current lifting rate of a rectifying station, and acquiring a current reference value and a current lifting rate of a first inverter station;
if the current reference value of the rectifying station and the current reference value of the first inverter station change simultaneously, acquiring the current value of the rectifying station and the current value of the first inverter station;
determining the current lifting rate of the first inversion station according to the current lifting rate, the current value and the changed current reference value of the rectification station, and the current value and the changed current reference value of the first inversion station;
and if only the current lifting rate of the first inversion station changes, adjusting the current lifting rate of the first inversion station to the changed current lifting rate.
2. The method according to claim 1, wherein the determining the current ramp rate of the first inverter station according to the current ramp rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station comprises:
substituting the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station into a formula
Figure FDA0002508225930000011
Obtaining the current lifting rate of the first inverter station; wherein, I_Ramp_BIs the current rise and fall rate, I, of the first inverter station_REF_BIs a changed current reference value, I, of the first inverter station_Act_BIs the current value of the first inverter station, I_Ramp_AIs the current rise and fall rate of the commutation station, I_REF_AIs a changed current reference value, I, of the rectifier station_Act_AIs the current value of the commutation station.
3. The method of coordinated power control of a direct current power transmission system according to claim 1, further comprising:
the second inverter station implements a constant voltage control strategy.
4. The method according to claim 3, wherein the second inverter station implements a constant voltage control strategy, specifically comprising:
the voltage of the second inversion station is maintained at a preset constant value, the current value of the second inversion station is the difference between the current value of the rectification station and the current value of the first inversion station, and the current rising and falling rate of the second inversion station is the difference between the current rising and falling rate of the rectification station and the current rising and falling rate of the first inversion station.
5. An apparatus for coordinated power control of a direct current power transmission system, comprising:
the first data acquisition module is used for acquiring a current reference value and a current lifting rate of the rectifying station and acquiring a current reference value and a current lifting rate of the first inverter station when the three-terminal direct-current power transmission system is in a first-to-second mode;
the second data acquisition module is used for acquiring the current value of the rectifying station and the current value of the first inverter station if the current reference value of the rectifying station and the current reference value of the first inverter station change simultaneously;
the first current rate adjusting module is used for determining the current lifting rate of the first inverter station according to the current lifting rate, the current value and the changed current reference value of the rectifier station, and the current value and the changed current reference value of the first inverter station;
and the second current rate adjusting module is used for adjusting the current lifting rate of the first inversion station to the changed current lifting rate if only the current lifting rate of the first inversion station changes.
6. An apparatus using a method of dc power transmission system power coordination control, characterized in that it comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing the method of dc power transmission system power coordination control according to any of claims 1 to 4.
7. 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 of dc power transmission system power coordination control according to any of claims 1 to 4.
CN202010453771.1A 2020-05-26 2020-05-26 Method and device for power coordination control of direct current transmission system and storage medium Active CN111817332B (en)

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