CN111525588B - Control method and device for voltage stabilization of direct current power transmission system and storage medium - Google Patents
Control method and device for voltage stabilization of direct current power transmission system and storage medium Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
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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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- 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]
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Abstract
The invention discloses a method, a device and a storage medium for controlling voltage stability of a direct current power transmission system, wherein the method comprises the following steps: monitoring the reactive interference amount of the alternating current bus voltage of a converter station in a direct current transmission system in real time; calculating to obtain real-time direct current and real-time direct voltage according to the reactive interference and the rated reactive power of the system; obtaining the correction quantity of the direct current according to the difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage; superposing the correction amount of the direct current and a direct current instruction value in a control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage and the direct current voltage command value to obtain a new direct current voltage command value; and regulating the reactive power output of the direct current transmission system according to the new direct current command value and the new direct voltage command value. The invention can maintain the voltage stability of the alternating current bus.
Description
Technical Field
The invention relates to the technical field of power system operation control, in particular to a method and a device for controlling voltage stability of a direct current transmission system and a storage medium.
Background
The high-voltage direct-current transmission system needs to consume a large amount of reactive power while transmitting active power, so a conventional direct-current system needs to be provided with a certain amount of alternating-current filters, high-voltage capacitors, low-voltage capacitors or reactors, and compensates the reactive power needed by the system while filtering system harmonics.
Disclosure of Invention
The embodiment of the invention aims to provide a control method, a device and a storage medium for voltage stability of a direct current transmission system.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling voltage stabilization of a dc power transmission system, including:
monitoring the reactive interference amount of the alternating current bus voltage of a converter station in a direct current transmission system in real time;
calculating to obtain real-time direct current and real-time direct voltage of the direct current transmission system according to the reactive interference amount and rated reactive power of the direct current transmission system;
obtaining rated direct current and rated direct voltage of the direct current transmission system, and obtaining correction of direct current according to the difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
superposing the correction amount of the direct current with a preset direct current instruction value in a control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
and adjusting the output of the reactive power of the direct current transmission system according to the new direct current instruction value and the new direct current voltage instruction value so as to ensure the stability of the alternating current bus voltage.
Preferably, the calculating to obtain the real-time direct current and the real-time direct current voltage of the direct current transmission system according to the reactive interference amount and the rated reactive power of the direct current transmission system specifically includes:
obtaining new reactive power of the direct current transmission system according to the sum of the reactive interference amount and the rated reactive power of the direct current transmission system; when reactive power is injected into the alternating current bus, the reactive interference amount takes a positive value; when the reactive power is absorbed to the alternating current bus, the reactive interference amount takes a negative value;
calculating to obtain real-time direct current and real-time direct voltage of the direct current transmission system according to the numerical relationship among direct current, direct voltage, active power and reactive power of the direct current transmission system; and the reactive power in the numerical relation is the new reactive power.
Preferably, the rated direct current and the rated direct voltage of the direct current transmission system are calculated by using the numerical relationships among the rated active power, the rated reactive power, the direct current, the direct voltage, the active power and the reactive power.
Preferably, the numerical relation among the direct current, the direct voltage, the active power and the reactive power is
And
wherein, IdIs a direct current, UdIs a direct voltage, PdIs active power, QdAnd U is the effective value of the no-load line voltage of the transformer valve side winding of the converter station.
Preferably, the adjusting the output of the reactive power of the dc power transmission system according to the new dc current command value and the new dc voltage command value to ensure the stability of the ac bus voltage specifically includes:
and outputting a new direct current instruction value and a new direct current voltage instruction value through a control trigger angle of a PI (proportional integral) controller of the control system, and adjusting the output of the reactive power of the direct current transmission system so as to ensure the stability of the alternating current bus voltage.
Another embodiment of the present invention provides a control apparatus for voltage stabilization of a dc power transmission system, including:
the monitoring module is used for monitoring the reactive interference quantity of the alternating current bus voltage of the converter station in the direct current transmission system in real time;
the calculation module is used for calculating to obtain real-time direct current and real-time direct current voltage of the direct current transmission system according to the reactive interference amount and the rated reactive power of the direct current transmission system;
the correction module is used for acquiring rated direct current and rated direct voltage of the direct current transmission system and acquiring correction quantity of direct current according to the difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
the instruction value acquisition module is used for superposing the correction amount of the direct current and a preset direct current instruction value in a control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
and the adjusting module is used for adjusting the output of the reactive power of the direct current transmission system according to the new direct current instruction value and the new direct current voltage instruction value so as to ensure the stability of the alternating current bus voltage.
A further embodiment of the present invention provides an apparatus using a control method for voltage stabilization of a dc power transmission system, 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 control method for voltage stabilization of a dc power transmission system as described in any one of the above when executing the computer program.
Yet another embodiment of the present invention provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program runs, an apparatus where the computer-readable storage medium is located is controlled to execute the control method for voltage stabilization of a dc power transmission system according to any one of the above.
Compared with the prior art, the method, the device and the storage medium for controlling the voltage stability of the direct current transmission system provided by the embodiment of the invention monitor the reactive power fluctuation condition at the bus of the direct current transmission receiving end system in real time, calculate the current correction quantity and the voltage correction quantity of the direct current system, and superimpose the current correction quantity and the voltage correction quantity to the fixed direct current control strategy of the rectifier station and the fixed direct current voltage control strategy of the inverter station so as to correct the reactive power output value of the direct current system and ensure that the reactive power injected into the alternating current system is within a certain range, thereby maintaining the voltage of the alternating current bus within an allowable value and improving the operation stability of the system.
Drawings
Fig. 1 is a schematic flowchart of a method for controlling voltage stabilization of a dc power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a dc power transmission system with reactive power interference at a receiving end according to an embodiment of the present invention;
fig. 3 is a voltage and current control block diagram of a dc control system of a dc power transmission system according to an embodiment of the present invention;
FIG. 4 is a block diagram of the calculation of the correction amount of DC current and voltage under reactive power disturbance according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a control apparatus for voltage stabilization of a dc power transmission system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an apparatus using a control method for voltage stabilization 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 schematic flow chart of a method for controlling voltage stabilization of a dc power transmission system according to an embodiment of the present invention is shown, where the method includes steps S1 to S5:
s1, monitoring the reactive interference quantity of the alternating current bus voltage of the converter station in the direct current transmission system in real time;
s2, calculating to obtain real-time direct current and real-time direct voltage of the direct current transmission system according to the reactive interference amount and the rated reactive power of the direct current transmission system;
s3, obtaining rated direct current and rated direct voltage of the direct current transmission system, and obtaining correction quantity of direct current according to the difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
s4, superposing the correction quantity of the direct current and a preset direct current instruction value in a control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
and S5, regulating the reactive power output of the direct current transmission system according to the new direct current instruction value and the new direct current voltage instruction value to ensure the stability of the alternating current bus voltage.
For a better understanding of the dc transmission system of the present invention, refer to fig. 2, which is a schematic diagram of a dc transmission system with reactive interference at a receiving end according to the embodiment of the present invention.
Specifically, the reactive interference amount of the alternating current bus voltage of the converter station in the direct current transmission system is monitored in real time. For ease of description, the amount of reactive interference is represented by Δ Q. The reactive interference quantity delta Q can be caused by the switching process of a filter and a capacitor of the system, and can also cause reactive fluctuation by external factors, such as the access of a new energy system or other power transmission systems electrically connected with the new energy system.
According to the reactive interference quantity delta Q and the rated reactive power Q of the direct current transmission systemdNAnd calculating to obtain the real-time direct current and the real-time direct voltage of the direct current power transmission system. Because the direct current, the direct voltage, the active power and the reactive power are in a certain numerical relation in a certain running state of the direct current transmission system, other unknown values can be calculated according to certain known values.
Obtaining rated direct current and rated direct voltage of a direct current transmission system, and obtaining correction of the direct current according to the difference between the rated direct current and the real-time direct current, namely the correction of the direct current is the difference of subtracting the real-time direct current from the rated direct current; and obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage, namely the correction quantity of the direct current voltage is the difference of the rated direct current voltage minus the real-time direct current voltage.
Superposing the correction amount of the direct current with a preset direct current instruction value in a control system to obtain a new direct current instruction value; and superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value. The preset direct current instruction value and the direct voltage instruction value are set according to the operation of the system under the steady-state working condition, and when the alternating current bus of the converter station is subjected to reactive interference, the correction quantity is corrected to the preset value, so that the control system can quickly react and adjust, and the voltage of the alternating current bus is prevented from generating large fluctuation.
And adjusting the output of the reactive power of the direct current transmission system according to the new direct current instruction value and the new direct voltage instruction value, so that the reactive power injected into the alternating current bus is maintained within a certain range, and the voltage of the alternating current bus is ensured to be stable.
In the method for controlling voltage stability of a dc power transmission system provided in embodiment 1 of the present invention, a current correction amount and a voltage correction amount of the dc system are calculated by monitoring a reactive power fluctuation situation at a bus of a dc power transmission receiving end system in real time, and are then superimposed to a constant dc current control strategy of a rectifier station and a constant dc voltage control strategy of an inverter station to correct a reactive power output value of the dc system, so as to ensure that a reactive power injected into an ac system is within a certain range, thereby maintaining a voltage of the ac bus within an allowable value and improving operation stability of the system.
As an improvement of the above scheme, the calculating, according to the reactive power disturbance quantity and the rated reactive power of the dc power transmission system, to obtain a real-time dc current and a real-time dc voltage of the dc power transmission system specifically includes:
obtaining new reactive power of the direct current transmission system according to the sum of the reactive interference amount and the rated reactive power of the direct current transmission system; when reactive power is injected into the alternating current bus, the reactive interference amount takes a positive value; when the reactive power is absorbed to the alternating current bus, the reactive interference amount takes a negative value;
and calculating to obtain the real-time direct current and the real-time direct voltage of the direct current transmission system according to the numerical relationship among the direct current, the direct voltage, the active power and the reactive power of the direct current transmission system.
Specifically, according to the reactive interference quantity delta Q and the rated reactive power Q of the direct current transmission systemdNThe sum of the two values to obtain the new reactive power delta Q + Q of the direct current transmission systemdN(ii) a When reactive power is injected into the alternating current bus, a positive value is taken out of the reactive interference; when absorbing reactive power to the AC bus, the reactive interference amount takes a negative value。
And calculating to obtain the real-time direct current and the real-time direct voltage of the direct current transmission system according to the numerical relationship among the direct current, the direct voltage, the active power and the reactive power of the direct current transmission system.
As an improvement of the above solution, the rated direct current and rated direct voltage of the direct current transmission system are calculated by using numerical relationships among rated active power, rated reactive power, direct current, direct voltage, active power and reactive power.
Specifically, the rated direct current and the rated direct voltage of the direct current transmission system are obtained by calculating the numerical relationships among the rated active power, the rated reactive power, the direct current, the direct voltage, the active power and the reactive power. That is, the rated dc current and the rated dc voltage of the dc power transmission system can be obtained by substituting the rated active power and the rated reactive power into the dc current, the dc voltage, and the numerical relationship between the active power and the reactive power.
As an improvement of the scheme, the numerical relation among the direct current, the direct voltage, the active power and the reactive power is
And
wherein, IdIs a direct current, UdIs a direct voltage, PdIs active power, QdAnd U is the effective value of the no-load line voltage of the transformer valve side winding of the converter station.
Specifically, the numerical relationship among the direct current, the direct voltage, the active power and the reactive power is
And
wherein, IdIs a direct current, UdIs a direct voltage, PdIs active power, QdAnd U is the effective value of the no-load line voltage of the transformer valve side winding of the converter station. While
And
the method is obtained according to the relation among direct current, voltage, active power and reactive power of a direct current transmission system under the steady-state operation working condition, and specifically comprises the following steps:
Pd＝IdUd
wherein S is the apparent power transmitted by the converter station; u shapedioThe method is ideal no-load direct current voltage for the transformer of the converter station.
As an improvement of the above scheme, the adjusting the output of the reactive power of the dc power transmission system according to the new dc current command value and the new dc voltage command value to ensure the stability of the ac bus voltage specifically includes:
and outputting a new direct current instruction value and a new direct current voltage instruction value through a control trigger angle of a PI (proportional integral) controller of the control system, and adjusting the output of the reactive power of the direct current transmission system so as to ensure the stability of the alternating current bus voltage.
Referring to fig. 3, it is a voltage and current control block diagram of a dc control system of a dc power transmission system according to the embodiment of the present invention, where each symbol in the diagram: delta Id、ΔUdIs the correction of DC current, the correction of DC voltage, Id、UdMeasuring DC current and voltage for DC systemValue Udref、IdrefFor a DC voltage command value and a DC current command value, K, preset in the DC control systemp1、Ki1S is a PI controller parameter, alphamin、αmaxFor the control range (minimum and maximum) of the firing angle of the DC system, alphaId、αUdThe firing angle under the control of direct current and the firing angle under the control of direct current voltage.
As can be seen from fig. 3, the new dc current command value is controlled and outputted by the constant current controller, and the new dc voltage command value is controlled and outputted by the constant voltage controller. In general, a new direct current command value and a new direct current voltage command value are output through a control trigger angle of a PI controller of a control system, the output of reactive power of a direct current transmission system is adjusted, interference caused by reactive disturbance is balanced, and the voltage of an alternating current bus is kept stable within an allowable range, so that the voltage of the alternating current bus is guaranteed to be stable.
For further understanding of the present invention, refer to fig. 4, which is a block diagram of calculating a correction amount of dc current and voltage under reactive disturbance according to the embodiment of the present invention. The symbols in the figure: delta Q is reactive interference quantity P at AC bus voltage of converter station of DC transmission systemdNTo rated active power, QdNTo rated reactive power, IdNFor rated direct current, UdNIs rated direct voltage, I'd、U′dThe real-time direct current value and the real-time direct current voltage value are obtained by calculation under the condition of reactive power interference.
As can be seen from fig. 4, under rated operating conditions, the active power and the reactive power transmitted by the dc transmission system are rated values PdN、QdNThe rated direct current and the direct voltage I can be calculateddN、UdN. Under the condition of no reactive disturbance, the voltage and current correction quantity calculated according to the figure 4 is 0, and the control system of the figure 3 is not influenced; when reactive interference exists, redundant reactive power or insufficient reactive power exists in the system, and delta Q is superposed to QdNObtaining a real-time direct-current voltage value U'dAnd a real-time DC current value I'dIs divided intoRespectively corresponding to a rated DC voltage value UdNAnd rated direct current value IdNDifference is made to obtain the voltage correction quantity delta UdSum current correction amount Δ IdAnd the direct current command value and the direct voltage command value are corrected when the direct current command value and the direct voltage command value are applied to the control system shown in fig. 3, and finally the trigger angle output is controlled through the PI controller, so that the reactive power value output adjustment of the direct current system is realized, the interference caused by reactive disturbance is balanced, and the voltage of the alternating current bus is kept stable at an allowable value.
Referring to fig. 5, a control apparatus for voltage stabilization of a dc power transmission system according to an embodiment of the present invention includes:
the monitoring module 11 is configured to monitor a reactive interference amount of an ac bus voltage of a converter station in the dc power transmission system in real time;
the calculation module 12 is configured to calculate a real-time direct current and a real-time direct current voltage of the direct current transmission system according to the reactive interference amount and the rated reactive power of the direct current transmission system;
the correction module 13 is configured to obtain a rated direct current and a rated direct voltage of the direct current transmission system, and obtain a correction amount of a direct current according to a difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
the instruction value acquisition module 14 is configured to superimpose the correction amount of the direct current and a preset direct current instruction value in the control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
and the adjusting module 15 is configured to adjust the output of the reactive power of the dc power transmission system according to the new dc current instruction value and the new dc voltage instruction value, so as to ensure the stability of the ac bus voltage.
The control device for voltage stabilization of a direct current power transmission system according to the embodiments of the present invention can implement all the processes of the control method for voltage stabilization 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 control device are respectively the same as those of the control method for voltage stabilization of a direct current power transmission system according to the embodiments, and are not described herein again.
Referring to fig. 6, the apparatus using the control method for voltage stabilization of a dc power transmission system according to an 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 control method for voltage stabilization of a dc 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 specific functions, which are used to describe the execution of a computer program in a method for controlling voltage stabilization in a dc power transmission system. For example, the computer program may be divided into a monitoring module, a calculating module, a modifying module, a command value acquiring module and an adjusting module, and the specific functions of each module are as follows:
the monitoring module 11 is configured to monitor a reactive interference amount of an ac bus voltage of a converter station in the dc power transmission system in real time;
the calculation module 12 is configured to calculate a real-time direct current and a real-time direct current voltage of the direct current transmission system according to the reactive interference amount and the rated reactive power of the direct current transmission system;
the correction module 13 is configured to obtain a rated direct current and a rated direct voltage of the direct current transmission system, and obtain a correction amount of a direct current according to a difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
the instruction value acquisition module 14 is configured to superimpose the correction amount of the direct current and a preset direct current instruction value in the control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
and the adjusting module 15 is configured to adjust the output of the reactive power of the dc power transmission system according to the new dc current instruction value and the new dc voltage instruction value, so as to ensure the stability of the ac bus voltage.
The device using the control method for voltage stabilization of the direct current transmission system can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The device using the control method for voltage stabilization 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 6 is merely an example of an apparatus using a control method for voltage stabilization of a dc power transmission system, and does not constitute a limitation of the apparatus using a control method for voltage stabilization of a dc power transmission system, and may include more or less components than those shown, or combine some components, or different components, for example, the apparatus using a control method for voltage stabilization of a dc power transmission system may further include input and output devices, network access devices, buses, and the like.
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, the processor 10 being a control center of the apparatus using the control method for voltage stabilization of the dc power transmission system, and various interfaces and lines connecting the respective parts of the apparatus using the control method for voltage stabilization of the dc power transmission system as a whole.
The memory 20 may be used to store the computer programs and/or modules, and the processor 10 implements various functions of the apparatus using the control method for voltage stabilization of a dc power transmission system by running or executing the computer programs and/or modules stored in the memory 20 and calling up data stored in the 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 device integrated module using the control method for voltage stabilization of the direct current transmission system can be stored in a computer readable storage medium if the device integrated module is implemented 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 controlling voltage stabilization of a dc power transmission system according to any one of the above embodiments.
To sum up, the method, the device and the storage medium for controlling voltage stability of the dc power transmission system provided by the embodiments of the present invention calculate a current correction amount and a voltage correction amount of the dc system by monitoring a reactive power fluctuation condition at a bus of a receiving end system of the dc power transmission in real time, and superimpose the current correction amount and the voltage correction amount on a constant dc current control strategy of a rectifier station and a constant dc voltage control strategy of an inverter station to correct a power output value of the dc system and ensure that a reactive power injected into an ac system is within a certain range, thereby maintaining a voltage of the ac bus within an allowable value and improving operation stability of the system. The method can be applied to various reactive disturbance problems under the condition of a system in a transient and steady state, the alternating voltage is stabilized by utilizing the quick regulation characteristic of the direct current control system, the system recovery speed is improved, and the interference effect of new energy equipment access, capacitor switching and other reactive changes of the direct current system on the system is reduced.
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 (6)
1. A control method for voltage stabilization of a direct current transmission system is characterized by comprising the following steps:
monitoring the reactive interference amount of the alternating current bus voltage of a converter station in a direct current transmission system in real time;
calculating to obtain real-time direct current and real-time direct voltage of the direct current transmission system according to the reactive interference amount and rated reactive power of the direct current transmission system;
obtaining rated direct current and rated direct voltage of the direct current transmission system, and obtaining correction of direct current according to the difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
superposing the correction amount of the direct current with a preset direct current instruction value in a control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
according to the new direct current instruction value and the new direct voltage instruction value, the output of the reactive power of the direct current transmission system is adjusted to ensure the stability of the alternating current bus voltage;
the calculating, according to the reactive interference amount and the rated reactive power of the dc power transmission system, to obtain a real-time dc current and a real-time dc voltage of the dc power transmission system specifically includes:
obtaining new reactive power of the direct current transmission system according to the sum of the reactive interference amount and the rated reactive power of the direct current transmission system; when reactive power is injected into the alternating current bus, the reactive interference amount takes a positive value; when the reactive power is absorbed to the alternating current bus, the reactive interference amount takes a negative value;
calculating to obtain real-time direct current and real-time direct voltage of the direct current transmission system according to the numerical relationship among direct current, direct voltage, active power and reactive power of the direct current transmission system;
wherein the reactive power in the numerical relationship is the new reactive power;
direct current, direct voltage, active power and reactive power of the direct current transmission systemThe numerical relationship between the powers is
And
Idis a direct current, UdIs a direct voltage, PdIs active power, QdAnd U is the effective value of the no-load line voltage of the transformer valve side winding of the converter station.
2. A method of controlling voltage stabilisation of a dc transmission system according to claim 1 wherein the dc current rating and the dc voltage rating of the dc transmission system are calculated from the numerical relationships between the real power rating, the reactive power rating and the dc current, the dc voltage, the real power and the reactive power.
3. The method according to claim 1, wherein the step of adjusting the output of reactive power from the dc power transmission system according to the new dc current command value and the new dc voltage command value to ensure the stabilization of the ac bus voltage comprises:
and outputting a new direct current instruction value and a new direct current voltage instruction value through a control trigger angle of a PI (proportional integral) controller of the control system, and adjusting the output of the reactive power of the direct current transmission system so as to ensure the stability of the alternating current bus voltage.
4. A control device for voltage stabilization of a direct current transmission system, comprising:
the monitoring module is used for monitoring the reactive interference quantity of the alternating current bus voltage of the converter station in the direct current transmission system in real time;
the calculation module is used for calculating to obtain real-time direct current and real-time direct current voltage of the direct current transmission system according to the reactive interference amount and the rated reactive power of the direct current transmission system;
the correction module is used for acquiring rated direct current and rated direct voltage of the direct current transmission system and acquiring correction quantity of direct current according to the difference between the rated direct current and the real-time direct current; obtaining the correction quantity of the direct current voltage according to the difference between the rated direct current voltage and the real-time direct current voltage;
the instruction value acquisition module is used for superposing the correction amount of the direct current and a preset direct current instruction value in a control system to obtain a new direct current instruction value; superposing the correction quantity of the direct current voltage with a preset direct current voltage command value in the control system to obtain a new direct current voltage command value;
the adjusting module is used for adjusting the output of the reactive power of the direct current transmission system according to the new direct current instruction value and the new direct current voltage instruction value so as to ensure the stability of the alternating current bus voltage;
the calculating, according to the reactive interference amount and the rated reactive power of the dc power transmission system, to obtain a real-time dc current and a real-time dc voltage of the dc power transmission system specifically includes:
obtaining new reactive power of the direct current transmission system according to the sum of the reactive interference amount and the rated reactive power of the direct current transmission system; when reactive power is injected into the alternating current bus, the reactive interference amount takes a positive value; when the reactive power is absorbed to the alternating current bus, the reactive interference amount takes a negative value;
calculating to obtain real-time direct current and real-time direct voltage of the direct current transmission system according to the numerical relationship among direct current, direct voltage, active power and reactive power of the direct current transmission system;
wherein the reactive power in the numerical relationship is the new reactive power;
the numerical relation among the direct current, the direct voltage, the active power and the reactive power of the direct current transmission system is
And
Idis a direct current, UdIs a direct voltage, PdIs active power, QdAnd U is the effective value of the no-load line voltage of the transformer valve side winding of the converter station.
5. An apparatus using a control method of direct current transmission system voltage stabilization, characterized by 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 control method of direct current transmission system voltage stabilization according to any one of claims 1 to 3 when executing the computer program.
6. 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 controlling dc power transmission system voltage stabilization according to any one of claims 1 to 3.
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