CN111597492B - Reactive standby calculation method and system for phase-regulating machine considering transient characteristics of direct current receiving end - Google Patents
Reactive standby calculation method and system for phase-regulating machine considering transient characteristics of direct current receiving end Download PDFInfo
- Publication number
- CN111597492B CN111597492B CN202010278293.5A CN202010278293A CN111597492B CN 111597492 B CN111597492 B CN 111597492B CN 202010278293 A CN202010278293 A CN 202010278293A CN 111597492 B CN111597492 B CN 111597492B
- Authority
- CN
- China
- Prior art keywords
- converter station
- reactive
- end converter
- receiving end
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001052 transient effect Effects 0.000 title claims abstract description 26
- 238000004364 calculation method Methods 0.000 title claims abstract description 21
- 230000008859 change Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Economics (AREA)
- Health & Medical Sciences (AREA)
- Data Mining & Analysis (AREA)
- Tourism & Hospitality (AREA)
- Marketing (AREA)
- General Health & Medical Sciences (AREA)
- Water Supply & Treatment (AREA)
- General Business, Economics & Management (AREA)
- Public Health (AREA)
- Primary Health Care (AREA)
- Algebra (AREA)
- Computational Mathematics (AREA)
- Strategic Management (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Human Resources & Organizations (AREA)
- Pure & Applied Mathematics (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a reactive standby calculation method and a reactive standby calculation system for a rectifier which take direct current receiving end transient characteristics into account, which are applied to an extra-high voltage alternating current/direct current power grid with a rectifier. The invention determines the reactive output range of steady operation of the phase-change machine on the premise of ensuring that the phase-change machine provides enough reactive support for the phase-change failure and recovery process of the converter station, thereby realizing reasonable utilization of reactive resources of the phase-change machine.
Description
Technical Field
The invention relates to the technical field of operation and control of power systems, in particular to a reactive standby calculation method and system for a rectifier taking account of transient characteristics of a direct current receiving end.
Background
Because the energy load distribution of China is very unbalanced, the direct current transmission technology gradually exerts the advantages in the aspect of large-capacity long-distance transmission, the capacity of the power grid for optimizing and configuring resources in a large range is obviously improved, and the contradiction of strong and weak intersection of the power grid is prominent. Because the extra-high voltage direct current system is only used as a transmission line of active power and cannot generate reactive power, the system is required to provide a large amount of reactive power for the extra-high voltage direct current system, the reactive power reserve of a receiving end power grid is obviously insufficient, and serious voltage instability is easy to cause. The phase-change device can be used as a dynamic reactive compensation device to well solve the problems of insufficient reactive power and voltage stability of the direct-current transmission system, and effectively reduce the risk of commutation failure of the converter station.
However, the cameras are used as high-quality reactive resources, only allow participation in steady-state reactive voltage control in a small fixed reactive regulation range in actual operation, and maintain the reactive power at 0MVar operation state for most of the time. In the traditional scheme, the cameras participate in steady-state reactive voltage control according to a reactive power regulation range required by fixed requirements, and reactive power output is basically 0MVar, so that the utilization rate of reactive power resources of the cameras is low, and the dynamic reactive power requirement of transient reactive power characteristics of a direct current receiving end cannot be ensured.
Disclosure of Invention
The invention aims to provide a reactive standby calculation method and a reactive standby calculation system for a phase-change camera taking account of transient characteristics of a direct-current receiving end, so that the phase-change camera provides enough reactive support for a phase-change failure and recovery process of a converter station, thereby determining a reasonable reactive adjustment range of the phase-change camera and participating in steady-state reactive voltage control.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the invention provides a reactive standby calculation method of a rectifier considering transient characteristics of a direct current receiving end, which comprises the following steps:
according to the power grid fault with the greatest influence on the alternating-current side bus voltage of the receiving-end converter station after the power grid fault, obtaining time-varying data of the alternating-current side bus voltage of the receiving-end converter station and a measuring value of the alternating-current side bus voltage of the receiving-end converter station before the fault;
calculating reactive exchange time-varying data between the receiving end converter station and an alternating current power grid according to the receiving end converter station alternating current side bus voltage time-varying data and the receiving end converter station reactive balance relation;
according to reactive exchange time-varying data between the receiving end converter station and the alternating current system, calculating a reactive power minimum value and a reactive power maximum value when the regulator operates in a steady state; and taking a range defined by the maximum value and the minimum value of reactive power when the phase-change regulator is in steady-state operation as a reactive power regulation range when the phase-change regulator participates in steady-state reactive voltage regulation.
Further, the method further comprises the following steps:
after the change of the transmission power of the receiving end converter station and the switching action of the filter in the station are judged, the power grid fault set screening is started, and the power grid fault information with the greatest influence on the bus voltage at the alternating current side of the receiving end converter station is screened.
Further, the time-varying data of the bus voltage at the ac side of the receiving end converter station refers to time-varying data of the bus voltage at the ac side of the receiving end converter station in the whole time scale after the occurrence of the grid fault with the greatest influence on the bus voltage at the ac side of the receiving end converter station is started to the fault clearance, and the reactive support capability of the phase regulator is not considered when the fault occurs.
Further, the calculating the reactive power exchange dynamic characteristic between the receiving end converter station and the ac power grid according to the bus voltage time-varying data of the receiving end converter station and the reactive power balance relation of the receiving end converter station includes:
wherein U is ac 、T、N、X c The voltage of the bus bar at the alternating current side of the receiving end converter station, the transformation ratio of the converter transformer, the bridge number of each pole and the equivalent commutation reactance are respectively shown as alpha, gamma and mu, the triggering angle, the arc extinguishing angle and the commutation overlapping angle of the receiving end converter station are respectively shown as alpha, gamma and mu,
u is the power factor angle of the receiving end converter station d Is the direct current voltage of the receiving end converter station, I d For direct current of receiving end converter station, Q e For reactive exchange between the receiving-end converter station and the alternating current system, B c The equivalent susceptance of a filter in the receiving end converter station;
direct current I of receiving end converter station d The method meets the following conditions:
wherein U is dH And U dL Indicating the upper and lower threshold values of direct current, I dH And I dL Representing the upper and lower limits of the current reference value.
Further, the calculating the minimum reactive power value and the maximum reactive power value of the regulator when the regulator operates in a steady state according to the reactive exchange time-varying data between the receiving end converter station and the alternating current system comprises:
according to reactive exchange time-varying data between the receiving-end converter station and the alternating current system, determining the maximum value Q 'of reactive power absorbed by the receiving-end converter station from the alternating current power grid, which is required to be born by the alternating current power grid' max And the AC bus voltage value U 'at that time' ac And the receiving converter station pouring reactive power maximum value Q' to the AC network " max And the AC bus voltage value U' at that time ac ；
Absorption of reactive power maximum value Q 'from AC network according to receiving end converter station' max And the AC bus voltage value U 'at that time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a reactive power minimum value when the dimmer is operating in steady state;
pouring reactive power maximum value Q' to alternating current power grid according to receiving end converter station " max And the AC bus voltage value U' at that time ac Calculating the maximum value i' of the d-axis current of the regulator d0 And a reactive power maximum when the dimmer is operating at steady state.
Further, the maximum value Q 'of reactive power is absorbed from the alternating current power grid according to the receiving-end converter station' max And the AC bus voltage value U 'at that time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a minimum reactive power value when the dimmer is operating at steady state, comprising:
Q' max ＝-U' ac ΔU ac /(X″ d +X k )+ΔU ac i' d0
ΔU ac ＝U′ ac -U ac0
wherein U is ac0 Is the voltage measurement value of the alternating current side bus of the receiving end converter station before failure, delta U ac For receiving-end converter stationsAlternating current bus voltage change value, X d 、X k The d-axis secondary transient reactance of the phase regulator and the boost short circuit reactance of the phase regulator are respectively;
according to the minimum value i 'of d-axis current of the regulator' d0 Calculating the minimum value of reactive power when the regulator operates in a steady state:
Q min ＝U ac0 i′ d0 。
further, the reactive maximum value Q' is reversely fed to an alternating current power grid according to the receiving-end converter station " max And the AC bus voltage value U' at that time ac Calculating the maximum value i' of the d-axis current of the regulator d0 And a maximum reactive power value when the dimmer is operating at steady state, comprising:
Q" max ＝-U″ ac ΔU ac /(X″ d +X k )+ΔU ac i″ d0
ΔU ac ＝U″ ac -U ac0
wherein U is ac0 Is the voltage measurement value of the alternating current side bus of the receiving end converter station before failure, delta U ac Is the voltage change value of the alternating current bus of the receiving end converter station, X d 、X k The d-axis secondary transient reactance of the phase regulator and the boost short circuit reactance of the phase regulator are respectively;
according to the maximum value i' of d-axis current of the regulator d0 Calculating the maximum value of reactive power when the regulator operates in a steady state:
Q max ＝U ac0 i″ d0 。
the invention also provides a reactive standby computing system of the rectifier taking the transient characteristics of the direct current receiving end into account, which comprises the following components:
the transient voltage data calculation module is used for obtaining time-varying data of the bus voltage of the alternating-current side of the receiving-end converter station and a bus voltage measurement value of the alternating-current side of the receiving-end converter station before the fault according to the power grid fault with the greatest influence on the bus voltage of the alternating-current side of the receiving-end converter station after the power grid fault;
the reactive standby calculation module of the phase-change regulator is used for calculating reactive exchange time-varying data between the receiving-end converter station and the alternating current power grid according to the receiving-end converter station alternating current side bus voltage time-varying data and the receiving-end converter station reactive balance relation;
according to reactive exchange time-varying data between the receiving end converter station and the alternating current system, calculating a reactive power minimum value and a reactive power maximum value when the regulator operates in a steady state; and taking a range defined by the maximum value and the minimum value of reactive power when the phase-change regulator is in steady-state operation as a reactive power regulation range when the phase-change regulator participates in steady-state reactive voltage regulation.
Further, the reactive standby calculation module of the camera is specifically used for,
according to reactive exchange time-varying data between the receiving-end converter station and the alternating current system, determining the maximum value Q 'of reactive power absorbed by the receiving-end converter station from the alternating current power grid, which is required to be born by the alternating current power grid' max And the AC bus voltage value U 'at that time' ac And the receiving converter station pouring reactive power maximum value Q' to the AC network " max And the AC bus voltage value U' at that time ac ；
Absorption of reactive power maximum value Q 'from AC network according to receiving end converter station' max And the AC bus voltage value U 'at that time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a reactive power minimum value when the dimmer is operating in steady state;
pouring reactive power maximum value Q' to alternating current power grid according to receiving end converter station " max And the AC bus voltage value U' at that time ac Calculating the maximum value i' of the d-axis current of the regulator d0 And a reactive power maximum when the dimmer is operating at steady state.
The beneficial technical effects of the invention are as follows:
the invention determines the reactive output range of steady operation of the phase-change machine on the premise of ensuring that the phase-change machine provides enough reactive support for the phase-change failure and recovery process of the converter station, thereby realizing reasonable utilization of reactive resources of the phase-change machine.
Drawings
FIG. 1 is a flow chart of a method for calculating reactive reserve of a rectifier taking account of transient characteristics of a DC receiver;
fig. 2 is a schematic diagram of a reactive standby computing system of a rectifier taking account of transient characteristics of a dc receiver of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in a simplified form that is used to illustrate only the embodiments of the invention.
The invention provides a reactive standby calculation method of a rectifier considering transient characteristics of a direct current receiving end, which is shown in fig. 1 and comprises the following steps:
step S101: after the change of the transmission power of the receiving end converter station and the switching action of the filter in the station are judged, the power grid fault set screening is started, the power grid fault information with the greatest influence on the bus voltage of the alternating current side of the receiving end converter station is screened, and the time-varying data of the bus voltage of the alternating current side of the receiving end converter station and the measurement value U of the bus voltage of the alternating current side of the receiving end converter station before the fault are obtained ac0 。
The time-varying data of the bus voltage of the alternating current side of the receiving end converter station is obtained after the power grid fault which has the greatest influence on the bus voltage of the alternating current side of the receiving end converter station begins to be cleared, and the reactive power supporting capability of the phase regulator is not considered when the fault occurs.
Step S102: and calculating reactive exchange dynamic characteristics between the receiving-end converter station and the alternating current power grid according to the obtained bus voltage time-varying data of the receiving-end converter station on the alternating current side and reactive balance relation of the receiving-end converter station.
Wherein, the reactive balance relation formula of the receiving end converter station is:
wherein: u (U) ac 、T、N、X c The voltage of the bus at the alternating current side of the receiving end converter station, the transformation ratio of the converter transformer, the bridge number of each pole and the equivalent commutation reactance are respectively; alpha, gamma, mu minutesThe triggering angle, the arc extinguishing angle and the commutation overlapping angle of the receiving end converter station are respectively;
u is the power factor angle of the receiving end converter station d Is the direct current voltage of the receiving end converter station, I d For direct current of receiving end converter station, Q e For reactive exchange between the receiving-end converter station and the alternating current system, B c Is the equivalent susceptance of the filter in the receiving end converter station.
Meanwhile, the influence of low-voltage current-limiting control characteristics (VDCOL) of the converters in the receiving-end converter station control system on direct current is considered, and the expression is as follows:
wherein: u (U) dH And U dL Representing the upper and lower threshold values of the direct current; i dH And I dL Representing upper and lower limits of the current reference value; i d The characteristic of the direct current representing the receiving converter station is determined by the current reference value output by VDCOL.
Time-varying data Q based on reactive exchange between a receiving converter station and an ac system e Determining the maximum value Q 'of reactive power absorbed by a receiving-end converter station to be born by an alternating current power grid from the alternating current power grid' max And the AC bus voltage value U 'at that time' ac The receiving end converter station reversely sends reactive power maximum value Q' to the alternating current power grid " max And the AC bus voltage value U' at that time ac 。
Step S103: absorption of reactive power maximum value Q 'from AC network according to receiving end converter station' max And the AC bus voltage value U 'at that time' ac Combining with a transient reactive power expression of the camera, and calculating to obtain a minimum value i 'of the d-axis current of the camera' d0 ；
The expression of the forced reactive power provided by the regulator to the system is as follows:
Q' max ＝-U' ac ΔU ac /(X″ d +X k )+ΔU ac i' d0
ΔU ac ＝U′ ac -U ac0
in U ac0 Is the voltage measurement value of the alternating current side bus of the receiving end converter station before failure, delta U ac Is the voltage change value of the alternating current bus of the receiving end converter station, X d 、X k The transient reactance of the d-axis of the phase regulator and the reactance of the step-up short circuit of the phase regulator are respectively.
According to the minimum value i 'of d-axis current of the regulator' d0 And calculating to obtain the minimum value of reactive power when the regulator operates at steady state: q (Q) min ＝U ac0 i' d0 。
Pouring reactive power maximum value Q' to alternating current power grid according to receiving end converter station " max And the AC bus voltage value U' at that time ac Calculating to obtain the maximum value i' of the d-axis current of the camera d0 ；
The low-excitation reactive power expression provided by the dimmer to the system is as follows:
Q" max ＝-U″ ac ΔU ac /(X″ d +X k )+ΔU ac i″ d0
ΔU ac ＝U″ ac -U ac0
according to the maximum value i' of d-axis current of the regulator d0 Calculating to obtain the maximum value of reactive power when the regulator operates at steady state: q (Q) max ＝U ac0 i" d0 。
The calculated reactive power maximum value Q of the camera during steady-state operation max And reactive power minimum value Q min As a reasonable reactive power regulation range when the regulator participates in steady reactive power voltage regulation.
The invention also provides a reactive standby calculation system of the dispatching camera for taking account of transient characteristics of the direct current receiving end, which is applied to an extra-high voltage direct current receiving end power grid dispatching master station system comprising the dispatching camera, and referring to fig. 2, the reactive standby calculation system comprises:
the transient voltage data calculation module 201 is configured to obtain time-varying data of the ac side bus voltage of the receiving end converter station and a measured value of the ac side bus voltage of the receiving end converter station before the fault according to a power grid fault with the greatest influence on the ac side bus voltage of the receiving end converter station after the power grid fault;
the rectifier reactive standby calculation module 202 is configured to calculate reactive exchange time-varying data between the receiving end converter station and the ac power grid according to the receiving end converter station ac side bus voltage time-varying data and the receiving end converter station reactive balance relation;
according to reactive exchange time-varying data between the receiving end converter station and the alternating current system, calculating a reactive power minimum value and a reactive power maximum value when the regulator operates in a steady state; and taking a range defined by the maximum value and the minimum value of reactive power when the phase-change regulator is in steady-state operation as a reactive power regulation range when the phase-change regulator participates in steady-state reactive voltage regulation.
Further, the reactive standby calculation module of the camera is specifically used for,
according to reactive exchange time-varying data between the receiving-end converter station and the alternating current system, determining the maximum value Q 'of reactive power absorbed by the receiving-end converter station from the alternating current power grid, which is required to be born by the alternating current power grid' max And the AC bus voltage value U 'at that time' ac And the receiving converter station pouring reactive power maximum value Q' to the AC network " max And the AC bus voltage value U' at that time ac ；
Absorption of reactive power maximum value Q 'from AC network according to receiving end converter station' max And the AC bus voltage value U 'at that time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a reactive power minimum value when the dimmer is operating in steady state;
pouring reactive power maximum value Q' to alternating current power grid according to receiving end converter station " max And the AC bus voltage value U' at that time ac Calculating the maximum value i' of the d-axis current of the regulator d0 And a reactive power maximum when the dimmer is operating at steady state.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. The reactive standby calculation method of the rectifier considering the transient characteristics of the direct current receiving end is characterized by comprising the following steps:
according to the power grid fault with the greatest influence on the alternating-current side bus voltage of the receiving-end converter station after the power grid fault, obtaining time-varying data of the alternating-current side bus voltage of the receiving-end converter station and a measuring value of the alternating-current side bus voltage of the receiving-end converter station before the fault; the time-varying data of the bus voltage of the alternating current side of the receiving end converter station refers to time-varying data of the bus voltage of the alternating current side of the receiving end converter station in the whole time scale after the occurrence of the power grid fault with the greatest influence on the bus voltage of the alternating current side of the receiving end converter station begins to clear the fault, and the reactive support capacity of a phase regulator is not considered when the fault occurs;
calculating reactive exchange time-varying data between the receiving end converter station and an alternating current power grid according to the receiving end converter station alternating current side bus voltage time-varying data and the receiving end converter station reactive balance relation;
according to reactive exchange time-varying data between the receiving end converter station and the alternating current system, calculating a reactive power minimum value and a reactive power maximum value when the regulator operates in a steady state; and taking a range defined by the maximum value and the minimum value of reactive power when the phase-change regulator is in steady-state operation as a reactive power regulation range when the phase-change regulator participates in steady-state reactive voltage regulation.
2. The method for calculating the reactive reserve of the rectifier taking account of the transient characteristics of the direct current receiver according to claim 1, further comprising:
after the change of the transmission power of the receiving end converter station and the switching action of the filter in the station are judged, the power grid fault set screening is started, and the power grid fault information with the greatest influence on the bus voltage at the alternating current side of the receiving end converter station is screened.
3. The method for calculating reactive standby of a rectifier according to claim 1, wherein calculating reactive exchange dynamic characteristics between a receiving end converter station and an ac power grid according to receiving end converter station ac side bus voltage time-varying data and a receiving end converter station reactive balance relation comprises:
wherein U is ac 、T、N、X c The voltage of the bus bar at the alternating current side of the receiving end converter station, the transformation ratio of the converter transformer, the bridge number of each pole and the equivalent commutation reactance are respectively shown as alpha, gamma and mu, the triggering angle, the arc extinguishing angle and the commutation overlapping angle of the receiving end converter station are respectively shown as alpha, gamma and mu,
u is the power factor angle of the receiving end converter station d Is the direct current voltage of the receiving end converter station, I d For direct current of receiving end converter station, Q e For reactive exchange between the receiving-end converter station and the alternating current system, B c The equivalent susceptance of a filter in the receiving end converter station;
direct current I of receiving end converter station d The method meets the following conditions:
wherein U is dH And U dL Indicating the upper and lower threshold values of direct current, I dH And I dL Representing the upper and lower limits of the current reference value.
4. The method for calculating reactive standby of a rectifier according to claim 1, wherein calculating a minimum reactive power value and a maximum reactive power value of the rectifier in steady state operation according to reactive exchange time-varying data between a receiving converter station and an ac system comprises:
according to reactive exchange time-varying data between the receiving-end converter station and the alternating current system, determining the maximum value Q 'of reactive power absorbed by the receiving-end converter station from the alternating current power grid, which is required to be born by the alternating current power grid' max And the AC bus voltage value U 'at this time' ac And the receiving converter station pouring reactive power maximum value Q' to the AC network " max And the AC bus voltage value U at this time ac ；
Absorption of reactive power maximum value Q 'from AC network according to receiving end converter station' max And the AC bus voltage value U 'at this time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a reactive power minimum value when the dimmer is operating in steady state;
pouring reactive power maximum value Q' to alternating current power grid according to receiving end converter station " max And the AC bus voltage value U at this time ac Calculating the maximum value i' of the d-axis current of the regulator d0 And a reactive power maximum when the dimmer is operating at steady state.
5. The method for calculating the reactive reserve of a rectifier taking account of the transient characteristics of the direct current receiver according to claim 4, characterized in that said maximum value of reactive power Q 'is absorbed from the alternating current network according to the receiver converter station' max And the AC bus voltage value U 'at this time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a minimum reactive power value when the dimmer is operating at steady state, comprising:
Q' max ＝-U' ac ΔU ac /(X″ d '+X k )+ΔU ac i' d0
ΔU ac ＝U′ ac -U ac0
wherein U is ac0 Is the voltage measurement value of the alternating current side bus of the receiving end converter station before failure, delta U ac Is the voltage change value of the alternating current bus of the receiving end converter station, X d 、X k The d-axis secondary transient reactance of the phase regulator and the boost short circuit reactance of the phase regulator are respectively;
according to the minimum value i 'of d-axis current of the regulator' d0 Calculating the minimum value of reactive power when the regulator operates in a steady state:
Q min ＝U ac0 i′ d0 。
6. the camera reactive power backup accounting for dc-link transient characteristics of claim 4The calculation method is characterized in that the reactive maximum value Q' is reversely sent to an alternating current power grid according to a receiving-end converter station " max And the AC bus voltage value U at this time ac Calculating the maximum value i' of the d-axis current of the regulator d0 And a maximum reactive power value when the dimmer is operating at steady state, comprising:
Q" max ＝-U″ ac ΔU ac /(X″ d +X k )+ΔU ac i″ d0
ΔU ac ＝U″ ac -U ac0
wherein U is ac0 Is the voltage measurement value of the alternating current side bus of the receiving end converter station before failure, delta U ac Is the voltage change value of the alternating current bus of the receiving end converter station, X d 、X k The d-axis secondary transient reactance of the phase regulator and the boost short circuit reactance of the phase regulator are respectively;
according to the maximum value i' of d-axis current of the regulator d0 Calculating the maximum value of reactive power when the regulator operates in a steady state:
Q max ＝U ac0 i″ d0 。
7. the utility model provides a take into account direct current receiving terminal transient state characteristic's camera reactive reserve computing system which characterized in that includes:
the transient voltage data calculation module is used for obtaining time-varying data of the bus voltage of the alternating-current side of the receiving-end converter station and a bus voltage measurement value of the alternating-current side of the receiving-end converter station before the fault according to the power grid fault with the greatest influence on the bus voltage of the alternating-current side of the receiving-end converter station after the power grid fault; the time-varying data of the bus voltage of the alternating current side of the receiving end converter station refers to time-varying data of the bus voltage of the alternating current side of the receiving end converter station in the whole time scale after the occurrence of the power grid fault with the greatest influence on the bus voltage of the alternating current side of the receiving end converter station begins to clear the fault, and the reactive support capacity of a phase regulator is not considered when the fault occurs;
the reactive standby calculation module of the phase-change regulator is used for calculating reactive exchange time-varying data between the receiving-end converter station and the alternating current power grid according to the receiving-end converter station alternating current side bus voltage time-varying data and the receiving-end converter station reactive balance relation;
according to reactive exchange time-varying data between the receiving end converter station and the alternating current system, calculating a reactive power minimum value and a reactive power maximum value when the regulator operates in a steady state; and taking a range defined by the maximum value and the minimum value of reactive power when the phase-change regulator is in steady-state operation as a reactive power regulation range when the phase-change regulator participates in steady-state reactive voltage regulation.
8. The system of claim 7, wherein the module is configured to,
according to reactive exchange time-varying data between the receiving-end converter station and the alternating current system, determining the maximum value Q 'of reactive power absorbed by the receiving-end converter station from the alternating current power grid, which is required to be born by the alternating current power grid' max And the AC bus voltage value U 'at this time' ac And the receiving converter station pouring reactive power maximum value Q' to the AC network " max And the AC bus voltage value U at this time ac ；
Absorption of reactive power maximum value Q 'from AC network according to receiving end converter station' max And the AC bus voltage value U 'at this time' ac Calculating the minimum value i 'of the d-axis current of the regulator' d0 And a reactive power minimum value when the dimmer is operating in steady state;
pouring reactive power maximum value Q' to alternating current power grid according to receiving end converter station " max And the AC bus voltage value U at this time ac Calculating the maximum value i of the d-axis current of the regulator d0 And a reactive power maximum when the dimmer is operating at steady state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278293.5A CN111597492B (en) | 2020-04-10 | 2020-04-10 | Reactive standby calculation method and system for phase-regulating machine considering transient characteristics of direct current receiving end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278293.5A CN111597492B (en) | 2020-04-10 | 2020-04-10 | Reactive standby calculation method and system for phase-regulating machine considering transient characteristics of direct current receiving end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111597492A CN111597492A (en) | 2020-08-28 |
| CN111597492B true CN111597492B (en) | 2023-05-05 |
Family
ID=72184918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010278293.5A Active CN111597492B (en) | 2020-04-10 | 2020-04-10 | Reactive standby calculation method and system for phase-regulating machine considering transient characteristics of direct current receiving end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111597492B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482668A (en) * | 2017-09-19 | 2017-12-15 | 南方电网科学研究院有限责任公司 | High-voltage direct-current constant-reactive power alternating-current fault recovery method and device |
| CN108808718A (en) * | 2018-06-26 | 2018-11-13 | 华南理工大学 | Method for determining direct current operation range of high-voltage direct current transmission system in alternating current fault |
| CN109378830A (en) * | 2018-12-03 | 2019-02-22 | 哈尔滨理工大学 | A kind of synchronous capacitor site selecting method based on long distance power transmission |
| CN109802399A (en) * | 2019-01-24 | 2019-05-24 | 重庆大学 | Consider phase modifier coordinative role and the UHVDC converter station dynamic reactive power optimization method that system filter requires |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842123B (en) * | 2019-01-24 | 2020-08-04 | 重庆大学 | Phase modulator and layered structure ultra-high voltage direct current receiving end converter station coordinated dynamic reactive power optimization method |
-
2020
- 2020-04-10 CN CN202010278293.5A patent/CN111597492B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482668A (en) * | 2017-09-19 | 2017-12-15 | 南方电网科学研究院有限责任公司 | High-voltage direct-current constant-reactive power alternating-current fault recovery method and device |
| CN108808718A (en) * | 2018-06-26 | 2018-11-13 | 华南理工大学 | Method for determining direct current operation range of high-voltage direct current transmission system in alternating current fault |
| CN109378830A (en) * | 2018-12-03 | 2019-02-22 | 哈尔滨理工大学 | A kind of synchronous capacitor site selecting method based on long distance power transmission |
| CN109802399A (en) * | 2019-01-24 | 2019-05-24 | 重庆大学 | Consider phase modifier coordinative role and the UHVDC converter station dynamic reactive power optimization method that system filter requires |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111597492A (en) | 2020-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103986136B (en) | A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light | |
| CN109378830B (en) | Synchronous phase modulator site selection method based on long-distance power transmission | |
| CN103606932B (en) | The low voltage dynamic reactive-power compensation capacitor autocontrol method that load is relevant | |
| CN108123497B (en) | Power distribution cabinet for AC/DC hybrid power supply and AC/DC hybrid power supply system | |
| CN110797921B (en) | Microgrid control method | |
| CN112467753B (en) | Reactive power replacement method and device | |
| CN110212567A (en) | High voltage ac/dc serial-parallel power grid numerical simulation modeling method containing large-scale phase modifier | |
| CN108321818B (en) | Multi-DC power emergency support coordination control method | |
| CN107769234B (en) | Frequency modulation capability evaluation method of multi-point energy storage coordination distributed power supply | |
| CN106026122A (en) | Integrated asynchronous excitation phase modifier and reactive compensation and active balance method thereof | |
| CN111864798B (en) | Energy storage energy throughput implementation method in wind power integration forecast deviation real-time compensation | |
| CN111555337B (en) | Analysis method for improving direct current receiving capacity of direct current weak receiving end power grid | |
| CN110034584A (en) | A kind of meter and the idle adaptive reactive voltage control method of abundance photovoltaic plant | |
| CN103647304B (en) | A kind of have outside power grid"black-start" subsystem paralleling method of supporting | |
| CN110661269A (en) | Phase modulator reactive power rapid supporting method for resisting direct-current continuous commutation failure | |
| CN104269854A (en) | Voltage control method based on direct current inverter station stability measurement indexes | |
| CN103904675B (en) | The interconnected current transformer of a kind of feeder line | |
| CN115589035A (en) | Grid-connected inverter system and low-frequency oscillation suppression method | |
| CN107910877A (en) | Shunt capacitor switching control method during a kind of sending end current conversion station high power fluctuation | |
| CN114024331B (en) | Planning operation measure optimization method for improving direct current bearing capacity | |
| CN108964120B (en) | Low-voltage distributed photovoltaic access capacity optimization control method | |
| CN108631293B (en) | DC/DC converter operation mode for DC distribution network and control method | |
| CN111597492B (en) | Reactive standby calculation method and system for phase-regulating machine considering transient characteristics of direct current receiving end | |
| CN111262255B (en) | Steady-state reactive power coordination control method for synchronous phase modulator and direct-current converter station | |
| CN112039130A (en) | Voltage constraint considered emergency control method for weak transmitting end power grid after direct current fault |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |