CN112910020A - Control method for optimizing dynamic reactive power characteristics of direct current inverter station - Google Patents
Control method for optimizing dynamic reactive power characteristics of direct current inverter station Download PDFInfo
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- CN112910020A CN112910020A CN202110505262.3A CN202110505262A CN112910020A CN 112910020 A CN112910020 A CN 112910020A CN 202110505262 A CN202110505262 A CN 202110505262A CN 112910020 A CN112910020 A CN 112910020A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- 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
-
- 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
-
- 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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- 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]
-
- 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
-
- 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 control method for optimizing dynamic reactive power characteristics of a direct current inverter station, which comprises the following steps of: step one, establishing a direct current transmission system, and rectifying direct current in the direct current transmission system based on an extra-high voltage direct current control system simulation model; inputting the rectified direct current into an inverter to enable the direct current to output an alternating current power transmission system; step three, carrying out inversion side low-voltage current limiting link processing on the alternating current transmission system to adjust impedance in the alternating current transmission system; and step four, transmitting the alternating current power transmission system after impedance adjustment to a receiving end through a filter. The receiving-end alternating-current power grid with different strengths can be obtained by changing the equivalent impedance of the alternating-current system, so that the dynamic reactive power characteristics of the inverter station can be adjusted, the value range of the voltage of a starting point in the low-voltage current limiting link of the inverter side can be adjusted through iterative simulation verification, and the dynamic reactive power requirements of the inverter station can be changed.
Description
Technical Field
The invention belongs to the technical field of dynamic reactive power characteristic control, and particularly relates to a control method for optimizing dynamic reactive power characteristics of a direct current inverter station.
Background
The direct current inverter station mainly comprises an inverter converter and a filter capacitor, and the influence of the direct current inverter station on the voltage stability depends on the comprehensive dynamic reactive power characteristic of the inverter station responding to the voltage fluctuation of a converter bus. However, at present, relevant researches on the characteristics, influence factors of the characteristics and a mechanism of adverse influence of an inverter station on voltage stability are rarely related, the dynamic reactive characteristics of an inverter side are effectively improved by optimizing upper and lower limit intervals of a voltage starting point based on a low-voltage current limiting link of a direct current transmission system, and the high-efficiency stable transmission of direct current power under the condition of large disturbance of an alternating current receiving end power grid is supported.
Disclosure of Invention
The invention provides a control method for optimizing dynamic reactive power characteristics of a direct current inverter station, which is used for solving at least one technical problem.
The invention provides a control method for optimizing dynamic reactive power characteristics of a direct current inverter station, which comprises the following steps of: the method comprises the following steps that firstly, a direct-current power transmission system is built, and direct current in the direct-current power transmission system is rectified based on an extra-high voltage direct-current control system simulation model; inputting the rectified direct current into an inverter, and enabling the inverter to output alternating current for power transmission; thirdly, carrying out inversion side low-voltage current limiting link processing on the alternating current transmission to improve the reactive power characteristic and the voltage stability of the alternating current receiving end system, and determining the voltage of a starting point in the inversion side low-voltage current limiting link according to the analysis and research of actual measured data of the alternating current-direct current hybrid system
Wherein the starting point voltage
The optimal value range of (1) is 0.8pu-0.9 pu; and step four, the alternating current after amplitude limiting processing is transmitted to a receiving end alternating current power grid, so that the reactive load of the receiving end power grid can be reduced, and the voltage stability of the receiving end power grid is supported.
In some embodiments of the invention, the rated voltage of the direct current transmission system
Is +/-800 kV and rated current
Rated power transmission of 5kA
Is 8000 MW.
In some embodiments of the present invention, the simulation model of the extra-high voltage dc control system is a CIGRE standard dc test system model, the rectification side is a constant power control, and the inversion side is a constant extinction angle control.
In some embodiments of the invention, the current limiting in the inversion-side low-voltage current limiting link
Is 1.0 pu.
In some embodiments of the invention, the expression of the voltage fluctuation in the alternating current is:
；
in the formula (I), the compound is shown in the specification,
the initial value of the electric potential is the initial value,
in order to be able to measure the amplitude of the fluctuation,
in order to be able to wave the frequency,
is simulation time.
The invention discloses a control method for optimizing the dynamic reactive power characteristic of a direct current inversion station, which effectively improves the dynamic reactive power characteristic of the inversion side and supports the efficient and stable transmission of direct current power under the condition of large disturbance of an alternating current receiving end power grid by optimizing the upper and lower limit parameters of the voltage starting point of a low voltage current limiting link based on a low voltage current limiting link of a direct current transmission system, is convenient to operate, does not need to newly add an additional controller, realizes the adjustment of the dynamic reactive power characteristic of the inversion station, adjusts the value range of the voltage of the starting point in the low voltage current limiting link of the inversion side through iterative simulation verification, ensures that the upper and lower limit parameter range of the voltage starting point of the determined low voltage current limiting link can reduce the dynamic reactive power requirement of the inversion station when the alternating current receiving end system is subjected to large disturbance to influence on the voltage stability performance, thereby obviously improving the voltage, the method has good engineering application potential and reliability, the regulation and control rule of the low-voltage current limiting link of the inverter station explored by the application has universality, and the method can be beneficial to the stability control problem encountered under the condition that large-scale direct current electric energy remote transmission faces large disturbance of a receiving-end alternating current system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a control method for optimizing dynamic reactive power characteristics of a dc inverter station according to an embodiment of the present invention;
fig. 2 is a circuit block diagram of a dynamic reactive power control structure of a dc inverter station according to an embodiment of the present invention;
fig. 3 is a characteristic curve diagram of the low-voltage current limit of the inverter according to an embodiment of the present invention;
FIG. 4 shows the voltage at the starting point of one embodiment of the present invention
A graph of the effect on the dynamic reactive characteristics;
fig. 5 is a graph illustrating an influence of the optimization measures on the dc power of the stability characteristics of the power grid in the west and the river according to an embodiment of the present invention;
fig. 6 is a graph illustrating an influence of the bus voltage of the converter station on the stability characteristics of the power grid in west and west before and after the optimization measures are taken according to an embodiment of the present invention;
fig. 7 is a graph illustrating an influence of the optimization measures on the power angle of the generator of the stable characteristics of the power grid in the west and the river according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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 flowchart of a control method for optimizing dynamic reactive power characteristics of a dc inverter station according to the present application is shown.
As shown in fig. 1, in step one, a direct current transmission system is established, and direct current in the direct current transmission system is rectified based on an extra-high voltage direct current control system simulation model;
in the second step, the rectified direct current is input into an inverter, so that the inverter outputs alternating current power transmission;
in the third step, the low-voltage current-limiting link of the inversion side is carried out on the alternating current transmission, so that the reactive power characteristic and the voltage stability of the alternating current receiving end system are improved, and the voltage of the starting point in the low-voltage current-limiting link of the inversion side is determined according to the analysis and research of the actual measured data of the alternating current-direct current hybrid system
Wherein the starting point voltage
The optimal value range of (1) is 0.8pu-0.9 pu;
in the fourth step, the alternating current after amplitude limiting processing is transmitted to the receiving end alternating current power grid, so that the reactive load of the receiving end power grid can be reduced, and the voltage stability of the receiving end power grid is supported.
According to the method, when the fixed current value is limited, the voltage of the starting point in the inversion side low-voltage current limiting link is adjusted, the equivalent impedance of an alternating current system can be changed, so that the receiving end alternating current power grid with different intensities is obtained, the dynamic reactive characteristic of the inversion station is adjusted, the value range of the voltage of the starting point in the inversion side low-voltage current limiting link is adjusted through iterative simulation verification, the dynamic reactive requirement of the inversion station can be changed, and the voltage stability of the receiving end power grid is improved.
In some optional embodiments, the limited current in the inversion side low voltage limited current link
Is 1.0 pu.
In some optional embodiments, the expression of the voltage fluctuation in the alternating current is:
；
in the formula (I), the compound is shown in the specification,
the initial value of the electric potential is the initial value,
in order to be able to measure the amplitude of the fluctuation,
in order to be able to wave the frequency,
is the simulation time.
Referring to fig. 2, a circuit block diagram of a dynamic reactive power control structure of a dc inverter station according to an embodiment of the present application is shown.
As shown in fig. 2, in which,
in order to realize the reactive power consumption of the inverter,
is a capacitive reactive power at the output of the filter,
to absorb reactive power from the ac system at the inverter station,
is a.c.The system has the ideal voltage source with the same potential value,
and
are the equivalent impedance of an alternating current system,
and active power is output to the inversion side.
The simulation model of the extra-high voltage direct current control system rectifies direct current in the direct current transmission system, then the rectified direct current is input into an inverter, so that output alternating current carries out inversion side low-voltage current limiting link processing on the alternating current transmission system, and receiving end alternating current power grids with different strengths can be obtained by adjusting equivalent impedance of the alternating current system.
In the direct current control system, after being subjected to large disturbance impact, the main factors of the dynamic reactive power characteristics of the inverter are respectively as follows:
1) VDCOL Start Point Voltage
And current
。
In the process of determining the voltage drop, the larger the value of the threshold value of the current-limiting starting action is, the larger the direct current amplitude limiting is under the same low voltage level, so that the direct current transmission active power can be reduced to a greater extent, and the reactive power consumption of the inverter is correspondingly reduced.
2) Constant power or constant current control. In the constant power control mode, the current command is dynamically changed in response to the transient process of the dc voltage. In contrast, in the constant current control mode, the current command is a constant set value. In the disturbed process, the difference of the direct current instruction influences the reactive power characteristic of the inverter station.
3) DC voltage measurement time constant under constant power control
. The parameter will influence the speed of the current command responding to the transient change of the direct current voltage in the constant power control mode. And if the value is smaller, the speed of the command current output by the fixed power control link is increased quickly in the voltage drop process, otherwise, the speed is slow.
The maximum influence factor, namely VDCOL (inversion side low voltage limited current) starting point voltage is obtained by respectively investigating the influence of each main factor on the dynamic reactive power characteristic of the inversion station
，
In the voltage drop process, the limiting current starting action threshold value is determined, the larger the value is, the larger the direct current amplitude limiting is under the same low voltage level, so that the direct current transmission active power can be reduced to a greater extent, and the reactive power consumption of the inverter is correspondingly reduced; firstly, rectifying direct current in a direct current transmission system by an extra-high voltage direct current control system simulation model, then inputting the rectified direct current into an inverter, enabling the inverter to output alternating current, carrying out inversion side low-voltage current limiting link processing on the alternating current, and transmitting the alternating current subjected to the amplitude limiting processing to a receiving end alternating current power grid, so that the reactive load of the receiving end power grid is reduced, and the voltage stability of the receiving end power grid is supported.
Referring to fig. 3, a VDCOL characteristic diagram of the inverter-side low-voltage current-limiting link according to an embodiment of the present application is shown.
As shown in fig. 3, the parameters of a typical low-voltage current limiting link before optimization are set as follows:
=0.4pu.、
=0.8pu.、
=0.55p.u.、
=1.0 pu. And the reactive power of the inverter station and the alternating current system is switched to zero under the rated operation state, and the reactive power consumption of the inverter is completely provided by the filter. And no active power flows on the equivalent impedance Zs line of the alternating current system, and the reference capacity of the alternating current system is 100 MVA.
Because the value of the VDCOL parameter has obvious influence on the reactive power consumption and the direct current transmission power of the converter station after disturbance, when the bus voltage of the inverter station drops, the VDCOL realizes the recovery rate control of the direct current system by limiting the direct current. Increasing the starting point voltage in the case of current limitation
The slope of the VDCOL characteristic curve will decrease. Correspond to
Under three conditions of values of 0.7 pu, 0.8pu and 0.9pu, the comparison curve of the dynamic reactive characteristics of the inverter station is shown in fig. 4 in the process of large fluctuation of the converter bus voltage.
As can be seen from FIGS. 4 (a) and 4 (b), the increase is
Value taking, namely under the same voltage drop level, the direct current limiting amplitude is increased, and the direct current transmission active power can be further reduced correspondingly; as can be seen from fig. 4 (c) and 4 (d), since the transmission active power is reduced, the inverter reactive power consumption is reduced
The voltage of the inverter station is reduced by a large margin, so that the adverse effect of the reduction of the reactive output of the filter along with the square multiple reduction of the voltage can be relieved, and the reactive power absorbed by the inverter station from the alternating current system is reduced
It will help the ac voltage recovery after disturbance.
In a specific embodiment, when three-phase permanent short circuit switching-off double-circuit disturbance occurs in a near zone switching-cloud peak circuit of a yazhong direct current receiving end converter station, voltage instability occurs in a Jiangxi power grid, and main parameters of a direct current control system are set as follows:
=0.8pu，
=0.15 pu. In the optimization scheme, the
Increased from 0.15pu to 0.45pu, will
The transient response of the system is increased from 0.8pu to 0.9pu, and the comparison curves of the transient response of the system in the two cases are shown in fig. 5, 6 and 7.
As can be seen from the comparison curves, the lift
The value can be taken, so that the VDCOL can be started in advance in the voltage dropping process, and the promotion is realized
The value can be taken, the VDCOL can be delayed to be started in the voltage recovery process, the reactive power absorbed by the corresponding inverter station from the alternating current power grid can be greatly reduced, and the receiving end voltage recovery characteristic is obviously improved.
In summary, in the voltage dropping process, the dc inverter station will exhibit the reactive load characteristic, and the control system parameters have significant influence on the reactive voltage trajectory characteristics thereof. VDCOL Start Point Voltage
Is dynamic reactive power affecting the inverter stationThe key parameter of the characteristic. Under the condition that the voltage stability is seriously influenced when an inversion side alternating current receiving end system is greatly disturbed, the voltage stability is improved
The value can reduce the dynamic reactive power requirement of the inverter station, and is an effective measure for improving the voltage stability of the receiving-end power grid.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A control method for optimizing dynamic reactive power characteristics of a direct current inverter station is characterized by comprising the following steps:
the method comprises the following steps that firstly, a direct-current power transmission system is built, and direct current in the direct-current power transmission system is rectified based on an extra-high voltage direct-current control system simulation model;
inputting the rectified direct current into an inverter, and enabling the inverter to output alternating current for power transmission;
thirdly, carrying out inversion side low-voltage current limiting link processing on the alternating current transmission to improve the reactive power characteristic and the voltage stability of the alternating current receiving end system, and determining the voltage of a starting point in the inversion side low-voltage current limiting link according to the analysis and research of actual measured data of the alternating current-direct current hybrid system
Wherein the starting point voltage
The optimal value range of (1) is 0.8pu-0.9pu；
And step four, the alternating current after amplitude limiting processing is transmitted to a receiving end alternating current power grid, so that the reactive load of the receiving end power grid can be reduced, and the voltage stability of the receiving end power grid is supported.
2. The control method for optimizing the dynamic reactive power characteristics of the direct current inversion station according to claim 1, wherein the rated voltage of the direct current transmission system
Is +/-800 kV and rated current
Rated power transmission of 5kA
Is 8000 MW.
3. The control method for optimizing the dynamic reactive power characteristics of the direct current inverter station according to claim 1, wherein the simulation model of the extra-high voltage direct current control system is a CIGRE standard direct current test system model, the rectification side is controlled by constant power, and the inversion side is controlled by constant extinction angle.
4. The control method for optimizing the dynamic reactive power characteristics of the direct current inversion station according to claim 1, wherein the limiting current in the inversion side low voltage limiting current link is limited
Is 1.0 pu.
5. The control method for optimizing the dynamic reactive power characteristics of the direct current inversion station according to claim 1, wherein the expression of the voltage fluctuation in the alternating current is as follows:
in the formula (I), the compound is shown in the specification,
the initial value of the electric potential is the initial value,
in order to be able to measure the amplitude of the fluctuation,
in order to be able to wave the frequency,
is the simulation time.
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2021
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Application publication date: 20210604 |