CN115514019B - Large-load test control method and system for new energy sent out by flexible direct current - Google Patents

Large-load test control method and system for new energy sent out by flexible direct current Download PDF

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Publication number
CN115514019B
CN115514019B CN202211253004.1A CN202211253004A CN115514019B CN 115514019 B CN115514019 B CN 115514019B CN 202211253004 A CN202211253004 A CN 202211253004A CN 115514019 B CN115514019 B CN 115514019B
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end station
sending
station
receiving end
transmitting
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CN115514019A (en
Inventor
梅念
王光达
薛振宇
吴延坤
于慧芳
陈钊
佟宇梁
王海猷
李铁臣
邹格
王娜
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State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
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State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • 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
    • H02J3/48—Controlling the sharing of the in-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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention relates to a method and a system for controlling a new energy source through a large load test of flexible direct current delivery, wherein the method comprises the following steps: setting a connection mode and a steady-state control mode of a receiving end station and a sending end station in a first sending system and a second sending system, and charging the receiving end station and the sending end station of the two sending systems, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level; unlocking a receiving end station and a sending end station in a first sending system and a second sending system respectively, and lifting direct current port voltage of the receiving end station in the two sending systems and alternating current bus voltage of the sending end station in the first sending system to target values; and respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the first sending system or the second sending system reaches the rated power. The invention can be widely applied to the field of flexible direct current transmission.

Description

Large-load test control method and system for new energy sent out by flexible direct current
Technical Field
The invention relates to the field of flexible direct current transmission, in particular to a method and a system for controlling a new energy source through a large load test of flexible direct current transmission.
Background
Compared with the traditional power transmission mode, the flexible direct current technology has the characteristics of realizing new energy power generation island grid connection, no commutation failure and the like, has obvious advantages in the aspects of large-scale new energy collection and delivery, and has wide application prospect.
In order to fully verify the equipment capability in the flexible direct current engineering, the flexible direct current engineering generally needs to carry out a heavy load test before formal operation. However, the new energy electric field and the flexible direct current engineering construction are often in different periods, the internet surfing power of the new energy electric field has larger random fluctuation, and the requirements of the flexible direct current engineering heavy load test on the internet surfing power and time are difficult to meet.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a large-load test control method and a large-load test control system for the flexible direct current outgoing of new energy, which can effectively solve the problems that the electric field of the new energy and the flexible direct current engineering are built at different periods, the random fluctuation of the internet surfing power of the electric field of the new energy is large, and the requirement of the large-load test of the flexible direct current engineering on the internet surfing power and time is difficult to meet.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the invention provides a method for controlling a heavy load test of new energy sent by flexible direct current, comprising the following steps:
Setting a connection mode and a steady-state control mode of a receiving end station and a sending end station in a first sending system and a second sending system, and charging the receiving end station and the sending end station of the two sending systems, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level;
unlocking a receiving end station and a sending end station in a first sending system and a second sending system respectively, and lifting direct current port voltage of the receiving end station in the two sending systems and alternating current bus voltage of the sending end station in the first sending system to target values;
and respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the first sending system or the second sending system reaches the rated power.
Further, the method for setting the connection mode and the steady-state control mode of the receiving station and the sending station in the first sending system and the second sending system, and charging the receiving station and the sending station of the two sending systems, so that the average working voltage of all the sub-modules in the receiving station and the sending station in the two sending systems is kept at a rated value level, includes:
operating switches of a receiving end station and a sending end station in the first sending system and the second sending system, so that direct current sides of the receiving end station and the sending end station in the two sending systems are in a polar connection state, and alternating current sides are disconnected with an alternating current bus;
Setting steady-state control modes of a receiving end station and a sending end station of a first sending system and a second sending system, so that an active power circulation mode is presented between the first sending system and the second sending system;
and charging the receiving end station and the sending end station of the first sending system and the second sending system in sequence, so that the average working voltage of all the sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level.
Further, the method for operating the switches of the receiving station and the sending station in the first sending system and the second sending system so that the direct current sides of the receiving station and the sending station in the two sending systems are in a polar connection state and the alternating current sides are disconnected from the alternating current bus comprises the following steps:
sequentially and automatically detecting and operating an alternating current/direct current switch of a receiving end station of a first sending system and a receiving end station of a second sending system, so that receiving end alternating current buses accessed by the two receiving end stations operate in a combined mode, the receiving end alternating current buses are communicated with a receiving end alternating current power grid, and meanwhile, receiving end station alternating current incoming line breakers in the first sending system and the second sending system are in a switching-off state;
and sequentially and automatically detecting and operating the AC/DC switches of the sending end stations of the first sending system and the second sending system, so that the sending end AC buses accessed by the two sending end stations operate in a combined mode, the sending end AC buses are disconnected from a new energy electric field, and meanwhile, the AC inlet circuit breakers of the sending end stations in the first sending system and the second sending system are respectively in a switching-on and switching-off state.
Further, the method for sequentially charging the receiving station and the sending station of the first sending system and the second sending system, so that the average working voltage of all sub-modules in the receiving station and the sending station in the two sending systems is kept at a rated value level, comprises the following steps:
closing an alternating current incoming line breaker of a receiving end station in a first outgoing system, and carrying out uncontrolled charging, controllable charging and dynamic voltage equalizing control on the receiving end station and the sending end station of the first outgoing system through a receiving end alternating current power grid, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the first outgoing system is kept at a rated value level;
the same method is used to charge the receiving station and the transmitting station in the second transmission system.
Further, the method for unlocking the receiving end station and the sending end station in the first sending system and the second sending system respectively and improving the direct current port voltage of the receiving end station in the two sending systems and the alternating current bus voltage of the sending end station in the first sending system to target values comprises the following steps:
when an unlocking instruction of the sending system is received, sequentially unlocking receiving end stations of the first sending system and the second sending system, and lifting direct current port voltages of the two receiving end stations to a direct current port voltage target value;
Unlocking the transmitting end station in the first transmitting system, lifting the alternating current bus voltage of the transmitting end station to an alternating current voltage target value, closing an alternating current incoming line breaker of the transmitting end station in the second transmitting system, and unlocking the transmitting end station in the second transmitting system.
Further, the method for sequentially unlocking the receiving end stations of the first sending system and the second sending system and lifting the direct current port voltage of the two receiving end stations to the direct current port voltage target value comprises the following steps:
setting command values of a fixed direct current voltage controller and a fixed reactive power controller of a receiving end station of a first delivery system, and then unlocking the receiving end station;
when the measured value of the direct current port voltage of the receiving end station of the first sending system meets the preset direct current voltage condition, setting the instruction value of the constant direct current voltage controller of the receiving end station to rise to the target value of the direct current port voltage according to the preset slope, so that the measured value of the direct current port voltage of the receiving end station rises;
when the measured value of the direct current port voltage and the measured value of the reactive power of the receiving end station of the first sending system meet the preset direct current voltage lifting completion condition, judging that the direct current port voltage of the receiving end station of the first sending system is lifted to a direct current port voltage target value;
and unlocking the receiving end station of the second sending system by adopting the same method, and lifting the direct current port voltage to the direct current port voltage target value.
Further, the method for unlocking the sending end station in the first sending system, lifting the alternating current bus voltage of the sending end station to the alternating current voltage target value, closing the alternating current incoming line breaker of the sending end station of the second sending system, and then unlocking the sending end station in the second sending system comprises the following steps:
setting a fixed alternating current voltage controller instruction value of a transmitting end station of a first transmitting system, rising according to a first preset slope, setting a fixed frequency controller instruction value of the transmitting end station, and then unlocking the transmitting end station;
when the command value of the fixed alternating voltage controller of the transmitting end station of the first transmitting system rises to a preset alternating voltage threshold value, keeping the command value unchanged;
when the actual measurement value of the alternating current bus voltage of the sending end station of the first sending system meets the preset alternating current bus voltage condition, setting the instruction value of the fixed alternating current voltage controller of the sending end station to rise to the alternating current bus voltage target value according to the second preset slope, so that the actual measurement value of the alternating current bus voltage of the sending end station rises;
when the actual measurement value of the alternating current bus voltage of the sending end station of the first sending system meets the preset alternating current voltage lifting completion condition, judging that the alternating current bus voltage of the sending end station is lifted to an alternating current bus voltage target value;
Closing an alternating current incoming line breaker of a transmitting end station of a second transmitting system, and setting a command value P of a fixed active power controller of the transmitting end station 2Br =0, constant reactive power controller command value Q 2Br =0, then unlock the end station.
Further, the method for respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the transmitting end station or the receiving end station in the outgoing system reaches the rated power thereof comprises the following steps:
the instruction value of the active power controller is determined by the transmitting end station of the second transmitting system to be lifted in a slope manner until the actual measured value of the active power of the receiving end station of the first transmitting system reaches the rated power, and the operation of the forward high-load test is kept for the required time;
and (3) obliquely reducing the instruction value of the fixed active power controller of the transmitting end station of the second transmitting system to zero, and then reversely obliquely lifting until the actual measured active power value of the receiving end station of the second transmitting system reaches the rated power, and keeping the operation of the reverse heavy load test for the required time.
Further, the method for obliquely lifting the instruction value of the active power controller of the second sending system sending end station until the actual measured value of the active power of the first sending system receiving end station reaches the rated power thereof comprises the following steps:
Setting a command value of a fixed active power controller of a transmitting end station of a second transmission system to be obliquely lifted until the command value of the fixed active power controller of the transmitting end station is lifted to a preset forward active power threshold value, and keeping the command value;
when the actual measured value of the active power of the transmitting end station of the second transmitting system meets the preset forward active power condition, updating the instruction value of the active power controller of the transmitting end station to be in a stepwise ascending mode until the actual measured value of the active power of the receiving end station of the first transmitting system meets the preset forward active power lifting completion condition, recording and keeping the active power instruction value of the transmitting end station of the second transmitting system at the moment, and keeping the reactive power instruction value at zero.
Further, the method for obliquely reducing the instruction value of the fixed active power controller of the transmitting end station of the second transmitting system to zero and then reversely obliquely lifting until the actual measured value of the active power of the receiving end station of the second transmitting system reaches the rated power thereof comprises the following steps:
setting a command value of a fixed active power controller of a transmitting terminal station of a second external transmission system, and then lifting the command value in a reverse slope manner after the command value is reduced to zero in a slope manner until the fixed active power controller of the transmitting terminal station is lifted to a preset reverse active power threshold value, and keeping the command value;
When the actual measured value of the active power of the transmitting end station of the second external transmission system meets the preset reverse active power condition, updating the instruction value of the fixed active power controller of the transmitting end station to be in a stepwise jump up until the actual measured value of the active power of the receiving end station of the second external transmission system meets the reverse active power lifting completion condition, and recording and maintaining the active power instruction value of the transmitting end station of the second external transmission system at the moment; while keeping the reactive power command at zero.
In a second aspect, the present invention provides a heavy load test control system for delivering new energy via flexible direct current, comprising:
the test preparation unit is used for setting the connection mode and the steady-state control mode of the receiving end station and the sending end station in the first sending system and the second sending system, and charging the receiving end station and the sending end station of the two sending systems, so that the average working voltage of all the sub-modules is kept at the rated value level;
the unlocking control unit is used for unlocking the receiving end station and the sending end station of the first sending system and the second sending system respectively, and improving the direct current port voltage of the receiving end station in the two sending systems and the alternating current bus voltage of the sending end station in the first sending system to target values;
the high-load test control unit is used for respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the first sending system or the second sending system reaches the rated power;
The acquisition unit is used for acquiring the relevant actual measurement values of the two delivery systems and sending the relevant actual measurement values to the test preparation unit, the unlocking control unit and the heavy load control unit.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the control method for the large-load test of the flexible direct current engineering can effectively solve the problems that the new energy electric field and the flexible direct current engineering construction are often different in period and the surfing power of the new energy electric field is larger in random fluctuation, and the requirement of the large-load test of the flexible direct current engineering on surfing power and time is difficult to meet.
2. The active power and reactive power requirements of the alternating current power grid are almost zero by adopting the large-load test control method of the flexible direct current engineering, and the disturbance to the alternating current power grid is small.
3. The maximum active power of each converter station in the test process by adopting the large-load test control method of the flexible direct current engineering is the rated active power of the converter station, and no extra overload capacity requirement is caused to the converter station.
Based on the advantages, the invention can be widely applied to a flexible direct current delivery system for new energy access.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a typical topology of a new energy source via a flexible DC delivery system;
FIG. 2 is a frame diagram of a large-load test control method for the new energy source sent out by flexible direct current according to the embodiment of the invention;
FIG. 3 is a flow chart of a test preparation method provided by an embodiment of the present invention;
fig. 4 is a flowchart of a method for boosting a dc port voltage of a receiving station in a two-way transmission system according to an embodiment of the present invention;
fig. 5 is a flowchart of an embodiment of the present invention for lifting an ac bus voltage of a transmitting end station in an outgoing system 1 and unlocking the transmitting end station in the outgoing system 2;
FIG. 6 is a control flow diagram of a heavy load test provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of a large-load test control system for delivering new energy through flexible direct current.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In some embodiments of the present invention, a method for controlling a heavy load test of new energy sent by flexible direct current is provided, where the method comprises: firstly, performing test preparation, including setting steady-state control modes of a receiving end station and a sending end station in two sending systems, enabling the two sending systems to present an active power circulation mode, and charging all sub-modules in the receiving end station and the sending end station in the two sending systems, so that average working voltage of the sub-modules is kept at a rated value level; then, the direct current port voltage of the receiving end station in the two sending systems and the alternating current bus voltage of the sending end station in the first sending system are lifted to target values; and finally, respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the outgoing system 1 or the outgoing system 2 reaches the rated power. The control method for the large-load test of the flexible direct current engineering can effectively solve the problems that the new energy electric field and the flexible direct current engineering construction are often in different periods, the surfing power of the new energy electric field is high in random fluctuation, and the requirement of the large-load test of the flexible direct current engineering on surfing power and time is difficult to meet.
Correspondingly, in other embodiments of the invention, a high-load test control system for delivering new energy through flexible direct current is provided.
Example 1
In this embodiment, taking the topology of the flexible direct current output system as an example of the typical new energy source shown in fig. 1, a method for controlling a heavy load test of the new energy source through flexible direct current output is described. The exemplary topology includes flexible direct current delivery systems (delivery systems for short) 1 and 2. The delivery system 1 comprises a receiving end converter station (called end station for short) 1-A and a delivering end converter station (called end station for short) 1-B, the delivery system 2 comprises a receiving end station 2-A and a delivering end station 2-B, the receiving end station 1-A and the receiving end station 2-A are connected with an alternating current power grid, and the delivering end station 1-B and the delivering end station 2-B are connected with a new energy electric field (such as a wind power field).
As shown in fig. 2, the method for controlling the heavy load test of the new energy sent out by the flexible direct current according to the embodiment includes the following steps:
1) Test preparation: setting a connection mode and a steady-state control mode of a receiving end station and a sending end station in the external sending system 1 and the external sending system 2, and charging the receiving end station and the sending end station in the two external sending systems, so that the average working voltages of all sub-modules in the receiving end station and the sending end station in the two external sending systems are kept at rated values;
2) Unlocking control: unlocking a receiving end station and a sending end station in the sending system 1 and the sending system 2 respectively, and lifting direct current port voltage of the receiving end station in the two sending systems and alternating current bus voltage of the sending end station in the sending system 1 to target values;
3) And (3) large load test control: and respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the outgoing system 1 or the outgoing system 2 reaches the rated power.
Preferably, as shown in fig. 3, in the step 1), the method for performing test preparation includes the steps of:
1.1 Switches of the receiving end station and the sending end station in the outgoing system 1 and the outgoing system 2 are operated, so that direct current sides of the receiving end station and the sending end station in the two outgoing systems are in a polar connection state, and alternating current sides are disconnected with an alternating current bus;
1.2 Setting steady-state control modes of a receiving end station and a sending end station in the sending system 1 and the sending system 2 so as to enable an active power circulation mode to be displayed between the sending system 1 and the sending system 2;
1.3 Charging the receiving and sending stations in the sending system 1 and the sending system 2 in sequence, so that the average working voltage of all sub-modules in the receiving and sending stations in the two sending systems is kept at a rated value level.
Preferably, in the step 1.1), the method for disconnecting the ac side of the receiving station and the transmitting station in the two outgoing systems from the ac bus is as follows:
and the AC/DC switches of the receiving end stations of the delivery system 1 and the delivery system 2 are automatically detected and operated in sequence, so that the receiving end AC buses accessed by the two receiving end stations operate in a combined mode, the receiving end AC buses are communicated with a receiving end AC power grid, and meanwhile, the receiving end AC inlet circuit breakers of the delivery system 1 and the delivery system 2 are in a separated state.
And the AC/DC switches of the sending end stations in the sending system 1 and the sending system 2 are automatically detected and operated in sequence, so that the sending end AC buses accessed by the two sending end stations operate in a combined mode, the sending end AC buses are disconnected from a new energy electric field, and meanwhile, the AC inlet circuit breakers of the sending end stations in the sending system 1 and the sending system 2 are respectively in a switching-on and switching-off state.
Preferably, in the step 1.2), a method for setting a steady-state control mode of a receiving station and a transmitting station in the outgoing system 1 and the outgoing system 2 so that an active power circulation mode is presented between the outgoing system 1 and the outgoing system 2 includes:
and setting the receiving end stations in the outgoing system 1 and the outgoing system 2 to a constant direct current voltage/constant reactive power control mode.
The transmitting end stations in the transmitting system 1 and the transmitting system 2 are respectively set into a fixed alternating voltage/fixed frequency control mode and a fixed active power/fixed reactive power control mode.
Preferably, in the step 1.3), the method of charging the receiving and sending end stations in the sending system 1 and the sending system 2 in turn, so that the average working voltage of all the sub-modules in the receiving and sending end stations in the two sending systems is kept at the rated value level, includes:
1.3.1 Closing an alternating current incoming line breaker of a receiving end station in the sending system 1, and carrying out uncontrolled charging, controllable charging and dynamic voltage equalizing control on the receiving end station and the sending end station in the sending system 1 through a receiving end alternating current power grid, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the sending system 1 is kept at a rated value level;
1.3.2 Charging the receiving and transmitting stations in the delivery system 2 in the same way as in step 1.3.1).
In a preferred embodiment, in the step 2), the method for unlocking the receiving end station and the sending end station in the outgoing system 1 and the outgoing system 2 respectively and raising the direct current port voltage of the receiving end station in the two outgoing systems and the alternating current bus voltage of the sending end station in the outgoing system 1 to the target value comprises the following steps:
2.1 When receiving the unlocking instruction of the sending system, sequentially unlocking the receiving end stations of the sending system 1 and the sending system 2, and lifting the direct current port voltage of the two receiving end stations to the direct current port voltage target value;
2.2 Unlocking the sending end station in the sending system 1, lifting the alternating current bus voltage of the sending end station to the alternating current voltage target value, closing the alternating current incoming line breaker of the sending end station in the sending system 2, and then unlocking the sending end station in the sending system 2.
Preferably, as shown in fig. 4, in step 2.1), the method for sequentially unlocking the receiving end stations of the sending system 1 and the sending system 2 and raising the dc port voltages of the two receiving end stations to the dc port voltage target value includes:
2.1.1 Setting command values of a constant direct current voltage controller and a constant reactive power controller of a receiving end station of the sending system 1, and then unlocking the receiving end station;
2.1.2 When the measured value of the direct current port voltage of the receiving end station of the sending system 1 meets the preset direct current voltage condition, setting the instruction value of the constant direct current voltage controller of the receiving end station to slowly rise to the target value of the direct current port voltage according to the preset slope, so that the measured value of the direct current port voltage of the receiving end station slowly rises;
2.1.3 When the measured value of the direct current port voltage and the measured value of the reactive power of the receiving end station of the sending system 1 meet the preset direct current voltage lifting completion condition, judging that the direct current port voltage of the receiving end station of the sending system 1 is lifted to a direct current port voltage target value;
2.1.4 The receiving end station of the delivery system 2 is unlocked by adopting the same method as the steps 2.1.1) to 2.1.3), and the direct current port voltage of the receiving end station is lifted to the direct current port voltage target value.
Preferably, in the step 2.1.1), the command value of the receiver-side stop-fixed dc voltage controller of the delivery system 1 may be set to U 1Adr ＝0.85U do The command value of the fixed reactive power controller can be set to be Q 1Ar =0, where U do Is the dc port voltage target value.
Preferably, in the step 2.1.2), the preset dc voltage condition is: Δt (delta t) sud U is arranged at any time in the period 1Ad ∈[0.85×(1-ΔU * d )U do ，0.85×(1+ΔU * d )U do ]Wherein U is 1Ad Is the measured value of the direct current port voltage of the receiving end station of the sending system 1, delta U * d For allowable DC voltage deviation per unit value, deltat sud And presetting a timing threshold for stabilizing the direct current voltage.
Preferably, in the step 2.1.2), the command value of the constant dc voltage controller of the receiving end station of the delivery system 1 may be updated to U 1Adr ＝(0.85+0.02Δt)U do Wherein, deltat is the period of the update time of the current time from the instruction value, and deltat is less than or equal to 7.5s.
Preferably, in the step 2.1.3), the preset dc voltage boost completion condition is:
Δt sud at any time in the period, there is a measured value U of the DC port voltage of the receiving end station of the sending system 1 1Ad ∈[(1-ΔU * d )U do ，(1+ΔU * d )U do ]And the actual reactive power measured value Q of the receiving terminal station 1A ∈[Q 1Ar -ΔQ，Q 1Ar +ΔQ]Where Δq is the allowed reactive power deviation.
Preferably, in the step 2.2), as shown in fig. 5, the sending end station in the sending out system 1 is unlocked, the ac bus voltage of the sending end station is raised to the ac voltage target value, the ac line incoming circuit breaker of the sending end station in the sending out system 2 is closed, and then the sending end station in the sending out system 2 is unlocked, which includes:
2.2.1 Setting a fixed alternating voltage controller instruction value of a transmitting end station in the transmitting system 1, rising according to a first preset slope, setting a fixed frequency controller instruction value of the transmitting end station, and then unlocking the transmitting end station;
2.2.2 When the command value of the fixed alternating voltage controller of the transmitting end station of the transmitting system 1 rises to a preset alternating voltage threshold value, the command value is kept unchanged;
2.2.3 When the actual measurement value of the alternating current bus voltage of the sending end station of the sending system 1 meets the preset alternating current bus voltage condition, setting the instruction value of the fixed alternating current voltage controller of the sending end station to slowly rise to the alternating current bus voltage target value according to the second preset slope, so that the actual measurement value of the alternating current bus voltage of the sending end station slowly rises;
2.2.4 When the actual measurement value of the alternating current bus voltage of the sending end station of the sending system 1 meets the preset alternating current voltage lifting completion condition, judging that the alternating current bus voltage of the sending end station is lifted to an alternating current bus voltage target value;
2.2.5 Ac line-in circuit breaker for closing the transmitting station of the transmitting system 2, setting the command value P of the fixed active power controller of the transmitting station 2Br =0, constant reactive power controller command value Q 2Br =0, then unlock the end station.
Preferably, in the step 2.2.1), the command value of the ac voltage controller of the transmitting station of the transmitting system 1 may be set as follows:
U 1Bacr ＝0.1ΔtU Baco
wherein U is 1Bacr A command value of a constant alternating current voltage controller for a transmitting end station of the transmitting system 1; u (U) Baco Is the target value of the alternating voltage of the sending-end alternating current bus.
The fixed frequency controller command value may be set to:
f r ＝f Bn
wherein f r Is a fixed frequency controller instruction value; f (f) Bn Is the rated frequency.
Preferably, in the step 2.2.2), the preset ac voltage threshold may be set to 85% of the ac voltage target value of the transmitting ac bus.
Preferably, in the step 2.2.3), the preset ac bus voltage condition is:
Δt suac u is arranged at any time in the period Bac ∈[0.85×(1-ΔU * Bac )U Baco ，0.85×(1+ΔU * Bac )U Baco ]Wherein U is Bac For the actual measurement value of the alternating current bus voltage of the transmitting end station, deltaU * Bac For the allowable ac voltage deviation per unit value, Δt suac The timing threshold is preset for stabilizing the alternating voltage.
Preferably, in the step 2.2.3), the command value of the ac voltage controller of the transmitting station of the transmitting system 1 is slowly increased to the target value of the ac bus voltage according to the second preset slope, which may be represented as U 1Bacr ＝(0.85+0.02Δt)U Baco Wherein Deltat is less than or equal to 7.5s.
Preferably, in the step 2.2.4), the preset ac voltage boost completion condition is:
Δt suac at any time in the period, there is an actual measurement value U of the AC bus voltage of the transmitting station Bac ∈[(1-ΔU * Bac )U Baco ，(1+ΔU * Bac )U Baco ]。
In a preferred embodiment, as shown in fig. 6, in the step 3), the method for respectively increasing the power of the forward dc system and the power of the reverse dc system until the actual measured value of the active power of the receiving end station in the outgoing system reaches the rated power thereof includes the following steps:
3.1 The instruction value of the active power controller is determined by the transmitting end station of the transmitting system 2 in a slope lifting way until the actual measured value of the active power of the receiving end station of the transmitting system 1 reaches the rated power, and the forward high-load test operation is kept for the required time;
3.2 The instruction value of the fixed active power controller of the transmitting end station of the transmitting system 2 is gradually reduced to zero and then reversely and gradually lifted until the actual measured value of the active power of the receiving end station of the transmitting system 2 reaches the rated power, and the operation of the reverse heavy load test is maintained for the required time.
Preferably, in the step 3.1), the method for ramping up the command value of the active power controller set by the transmitting end station of the transmitting system 2 until the actual measured value of the active power of the receiving end station of the transmitting system 1 reaches the rated power thereof includes:
3.1.1 Setting the instruction value of the fixed active power controller of the transmitting end station of the transmitting system 2, and lifting in a slope manner until the instruction value of the fixed active power controller of the transmitting end station is lifted to a preset forward active power threshold value, and keeping the instruction value;
3.1.2 When the actual measured value of the active power of the transmitting end station of the transmitting system 2 meets the preset forward active power condition, updating the instruction value of the fixed active power controller of the transmitting end station to be stepwise raised until the actual measured value of the active power of the receiving end station of the transmitting system 1 meets the preset forward active power lifting completion condition, recording and maintaining the active power instruction value P of the transmitting end station of the transmitting system 2 at the moment 2Bqr While keeping the reactive power command value at zero.
Preferably, in the step 3.1.1), the command value of the fixed active power controller of the transmitting end station of the transmitting system 2 may be set as follows:
P 2Br ＝0.1P n Δt
wherein P is 2Br An active power controller command value is set for a transmitting end station of the transmitting system 2; p (P) n Is the monopole rated active power of the transmitting station. I.e. fixed active power controller finger of the transmitting end station provided with the outgoing system 2Let value P 2Br At a slope of 0.1P n Rapidly rises.
More preferably, in the step 3.1.1), the preset forward active power threshold may be set to 85% of the monopole rated active power of the transmitting station, i.e. 0.85P n 。
Preferably, in the step 3.1.2), the preset forward active power condition is: Δt (delta t) sp At any time in the period, P is 2B ∈[0.85×(1-ΔP * )P n ，0.85×(1+ΔP * )P n ]Wherein P is 2B Is the actual measured value of active power, ΔP, of the transmitting end station of the outbound system 2 * A per unit value for the allowed active power deviation; Δt (delta t) sp A power stabilization timing threshold is preset;
the preset forward active power boost completion conditions are: Δt (delta t) sp At any time in the period, P is 1A ∈[(1-ΔP * )P n ，(1+ΔP * )P n ]Wherein P is 1A Is the actual measured value of the active power of the receiving end station of the transmitting system 1.
Preferably, in the above step 3.1.2), the step-up of the command value of the fixed active power controller of the transmitting end station of the transmitting system 2 may be represented as P 2Br (nΔt s )＝P 2Br (nΔt s -Δt s )+0.01P n . Wherein t is 0 P is the preset forward active power condition meeting time 2Br (t 0 )＝0.85P n ，1≤n<15。
Preferably, in the step 3.2), the method for obliquely reducing the instruction value of the fixed active power controller of the transmitting end station of the transmitting system 2 to zero and then reversely obliquely lifting until the actual measured value of the active power of the receiving end station of the transmitting system 2 reaches the rated power thereof includes:
3.2.1 Setting a command value of a fixed active power controller of a transmitting end station of the transmitting system 2, and then reversely and obliquely lifting the command value until the fixed active power controller of the transmitting end station rises to a preset reverse active power threshold value, and keeping the command value;
3.2.2 When the actual measured value of the active power of the transmitting end station of the transmitting system 2 meets the preset reverse active power conditionUpdating the instruction value of the fixed active power controller of the transmitting station into a stepwise ascending mode until the actual measured value of the active power of the receiving station of the transmitting system 2 meets the reverse active power lifting completion condition, and recording and maintaining the instruction value P 'of the active power of the transmitting station of the transmitting system 2 at the moment' 2Bqr The method comprises the steps of carrying out a first treatment on the surface of the While keeping the reactive power command at zero.
Preferably, in the step 3.2.1), the instruction value of the active power controller set by the transmitting end station of the transmitting system 2 may be set as follows:
P 2Br ＝P 2Bqr -0.1P n Δt
more preferably, the preset reverse active power threshold is set to: p (P) 2Br ＝-0.85P n 。
Preferably, in the step 3.2.2), the preset reverse active power condition is: Δt (delta t) sp At any time in the period, there is an actual measured value P of the active power of the transmitting end station of the transmitting system 2 2B ∈[0.85×(-1+ΔP * )P n ，0.85×(-1-ΔP * )P n ]；
The preset reverse active power boost completion conditions are: Δt (delta t) sp At any time in the period, there is an actual measured value P of the active power of the transmitting end station of the transmitting system 2 2B ∈[(-1+ΔP * )P n ，(-1-ΔP * )P n ]。
Preferably, in the step 3.2.2), the command value of the fixed active power controller of the transmitting end station of the transmitting system 2 is set to be a step-up, which may be represented as P 2Br (nΔt s )＝P 2Br (nΔt s -Δt s )-0.01P n . Wherein t is 0 P is the preset reverse active power condition meeting time 2Br (t 0 )＝-0.85P n ，1≤n<15。
Example 2
In contrast to the foregoing embodiment 1, which provides a method for controlling a heavy load test of new energy sent out by flexible direct current, this embodiment provides a system for controlling a heavy load test of new energy sent out by flexible direct current. The system provided by the embodiment can implement the large-load test control method of the new energy sent by the flexible direct current in the embodiment 1, and the system can be realized by software, hardware or a combination of the software and the hardware. For example, the system may include integrated or separate functional modules or functional units to perform the corresponding steps in the methods of embodiment 1. Since the system of this embodiment is substantially similar to the method embodiment, the description of this embodiment is relatively simple, and the relevant points may be found in part in the description of embodiment 1, which is provided by way of illustration only.
As shown in fig. 7, the heavy load test control system for delivering new energy through flexible direct current according to this embodiment includes:
the test preparation unit is used for setting the connection mode and the steady-state control mode of the receiving end station and the sending end station in the external sending system 1 and the external sending system 2, and charging the receiving end station and the sending end station of the two external sending systems, so that the average working voltage of all the sub-modules in the receiving end station and the sending end station in the two external sending systems is kept at a rated value level;
The unlocking control unit is used for unlocking the receiving end station and the sending end station of the sending system 1 and the sending end station of the sending system 2 respectively, and improving the direct current port voltage of the receiving end station in the two sending systems and the alternating current bus voltage of the sending end station in the sending system 1 to target values;
the large load test control unit is used for respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the outgoing system 1 or the outgoing system 2 reaches the rated power thereof;
the acquisition unit is used for acquiring the relevant measured values of the delivery system and sending the relevant measured values to the test preparation unit, the unlocking control unit and the heavy load control unit, wherein the acquired relevant measured values comprise: the method comprises the steps of measuring the voltage actual measurement value, the active power actual measurement value and the reactive power actual measurement value of a direct current port of a receiving end station of an outgoing system 1 and an outgoing system 2, measuring the voltage actual measurement value of an alternating current bus of the receiving end station of the outgoing system 1 and the active power actual measurement value of the receiving end station of the outgoing system 2.
Preferably, the test preparation unit comprises a switch operation module, a control mode setting module and a converter station charging module, wherein the switch operation module is used for operating switches of a receiving end station and a sending end station in the outgoing system 1 and the outgoing system 2, so that direct current sides of the receiving end station and the sending end station in the two outgoing systems are in a polar connection state, and an alternating current side is disconnected from an alternating current bus; the control mode setting module is used for setting steady-state control modes of the receiving end station and the sending end station in the sending system 1 and the sending system 2 so that an active power circulation mode is displayed between the sending system 1 and the sending system 2; the converter charging module is used for charging the receiving end station and the sending end station of the sending system 1 and the sending end station of the sending system 2 in sequence, so that the average working voltage of all the sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level.
Preferably, the unlocking control unit comprises a receiving end station unlocking control module, an sending end station unlocking control module of the sending system 1 and a sending end station unlocking control module of the sending system 2, wherein the receiving end station unlocking control module is used for sequentially unlocking the receiving end stations of the sending system 1 and the sending system 2 when receiving an unlocking instruction of the sending system and improving the direct current port voltages of the two receiving end stations to a direct current voltage target value; the sending end station unlocking control module of the sending system 1 is used for unlocking the sending end station in the sending system 1 and improving the alternating current bus voltage of the sending end station to an alternating current voltage target value; the unlocking control module of the sending end station of the sending system 2 is used for closing an alternating current incoming line breaker of the sending end station in the sending system 2 and unlocking the sending end station in the sending system 2.
Preferably, the large load test control unit comprises a forward large load control module and a reverse large load control module, wherein the forward large load control module is used for obliquely lifting the instruction value of the active power controller of the sending end station of the sending system 2 until the actual measured value of the active power of the receiving end station of the sending system 1 reaches the rated power of the receiving end station, and the forward large load test is kept to run for the required time; the reverse direction heavy load control module is used for obliquely reducing the instruction value of the fixed active power controller of the transmitting end station of the transmitting system 2 to zero and then reversely and obliquely lifting until the actual measured value of the active power of the receiving end station of the transmitting system 2 reaches the rated power, and then the operation of the reverse direction heavy load test is kept for the required time.
Example 3
Taking the flexible direct current output system as an example of the new energy source shown in fig. 1, the method of the invention is further described in detail.
The delivery system 1 comprises a receiving end station 1-A and a delivering end station 1-B, the delivery system 2 comprises a receiving end station 2-A and a delivering end station 2-B, the receiving end station 1-A and the receiving end station 2-A are connected with an alternating current power grid, and the delivering end station 1-B and the delivering end station 2-B are connected with a new energy electric field (such as a wind power field). The rated power of the receiving end station 1-A, the receiving end station 2-A, the transmitting end station 1-B and the transmitting end station 2-B meets P N1A ＝P N2A ＝P N1B ＝P N2B =1500 MW. DC port voltage target value U do Allowable dc voltage deviation per unit value Δu =500 kV * d =0.01, preset dc voltage stabilization timing threshold Δt sud =300 ms; AC voltage target value U of transmitting-end AC bus Baco =230 kV, nominal frequency f Bn Allowable ac voltage deviation per unit value Δu =50 Hz * Bac =0.01, preset ac voltage stabilization timing threshold Δt suac =300 ms; allowable active power deviation per unit value deltap * =0.01, allowed reactive power deviation Δq=1 Mvar, preset power stabilization timing threshold Δt sp ＝300ms。
The control method of the new energy source through the heavy load test of the flexible direct current outgoing project comprises the following steps:
1) Test preparation: setting a connection mode and a control mode of a receiving end station 1-A, a receiving end station 2-A, a transmitting end station 1-B and a transmitting end station 2-B, and charging the receiving end station and the transmitting end station in the two sending-out systems, so that the average working voltages of all sub-modules in the receiving end station and the transmitting end station in the two sending-out systems are kept at rated values;
2) Unlocking control: unlocking the receiving end station 1-A, the receiving end station 2-A, the sending end station 1-B and the sending end station 2-B respectively, and lifting direct current port voltages of the receiving end station 1-A and the receiving end station 2-A and alternating current bus voltage of the sending end station 1-B to target values;
3) And (3) large load control: and respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the outgoing system reaches the rated power.
Preferably, in the step 1), the method for performing test preparation includes the steps of:
1.1 Switches of the receiving end station 1-A, the receiving end station 2-A, the transmitting end station 1-B and the transmitting end station 2-B are operated, so that direct current sides of the receiving end station and the transmitting end station in the two transmitting systems are in a polar connection state, and alternating current sides are disconnected with an alternating current bus;
1.2 A steady-state control mode of the receiving end station 1-A, the receiving end station 2-A, the transmitting end station 1-B and the transmitting end station 2-B is set, so that an active power circulation mode is displayed between the transmitting system 1 and the transmitting system 2;
1.3 The receiving station 1-a and the transmitting station 1-B are charged in sequence, and the receiving station 2-a and the transmitting station 2-B are charged so that the average operating voltages of all sub-modules in the receiving station and the transmitting station in the two delivery systems are maintained at rated values.
Preferably, in the step 1.1), the method for disconnecting the ac side of the receiving station and the transmitting station in the two outgoing systems from the ac bus is as follows: sequentially and automatically detecting and operating an AC/DC switch of the receiving terminal station 1-A and an AC/DC switch of the receiving terminal station 2-A, closing a switch B10 to enable receiving terminal AC buses accessed by the two receiving terminal stations to operate in a combined mode, closing B6 and B7 to enable the receiving terminal AC buses to be communicated with a receiving terminal AC power grid, simultaneously opening an AC incoming line breaker B8 of the receiving terminal station 1-A and opening an AC incoming line breaker B9 of the sending terminal station 2-A;
Sequentially and automatically detecting and operating an AC/DC switch of the transmitting terminal station 1-B and an AC/DC switch of the transmitting terminal station 2-B, closing a switch B5 to enable the transmitting terminal AC buses accessed by the two transmitting terminal stations to operate, opening B1 and B2 to enable the transmitting terminal AC buses to be disconnected with a new energy electric field, closing an AC incoming line breaker B3 of the transmitting terminal station 1-B, and opening an AC incoming line breaker B4 of the transmitting terminal station 2-B;
preferably, in the step 1.2), a method for setting a steady-state control mode of a receiving station and a transmitting station in the outgoing system 1 and the outgoing system 2 so that an active power circulation mode is presented between the outgoing system 1 and the outgoing system 2 includes:
the receiving end station 1-a and the receiving end station 2-a are both set to a constant direct voltage/constant reactive power control mode.
The transmitting end station 1-B and the transmitting end station 2-B are respectively set into a fixed alternating voltage/fixed frequency control mode and a fixed active power/fixed reactive power control mode;
preferably, in the step 1.3), the method of charging the receiving and sending end stations in the sending system 1 and the sending system 2 in turn, so that the average working voltage of all the sub-modules in the receiving and sending end stations in the two sending systems is kept at the rated value level, includes:
1.3.1 Closing an alternating current incoming line breaker B8 of the receiving end station 1-A, and carrying out uncontrolled charging, controllable charging and dynamic voltage equalizing control on the receiving end station 1-A and the sending end station 1-B through a receiving end alternating current power grid, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the sending system 1 is kept at a rated value level;
1.3.2 The same method as in step 1.3.1) is used to charge the receiving end station 2-a and the transmitting end station 2-B.
In a preferred embodiment, the step 2) includes the steps of:
2.1 When an unlocking instruction of the sending system is received, unlocking the receiving terminal station 1-A and the receiving terminal station 2-A in sequence, and lifting the direct current port voltage of the two receiving terminal stations to a direct current port voltage target value;
2.2 Unlocking the terminal station 1-B, lifting the ac bus voltage of the terminal station to the ac voltage target value, closing the ac line breaker B4 of the terminal station 2-B, and then unlocking the terminal station 2-B.
Preferably, in the step 2.1), the receiving end station 1-a and the receiving end station 2-a are unlocked in sequence, and the method for raising the dc port voltage of the two receiving end stations to the dc port voltage target value includes:
2.1.1 Setting command values of a fixed direct current voltage controller and a fixed reactive power controller of the receiving end station 1-A, and then unlocking the receiving end station;
2.1.2 When the measured value of the direct current port voltage of the receiving terminal station 1-A meets the preset direct current voltage condition, setting the instruction value of the constant direct current voltage controller of the receiving terminal station to slowly rise to the target value of the direct current port voltage according to the preset slope, so that the measured value of the direct current port voltage of the receiving terminal station slowly rises;
2.1.3 When the direct current port voltage actual measurement value and the reactive power actual measurement value of the receiving end station 1-A meet the preset direct current voltage lifting completion condition, judging that the direct current port voltage of the receiving end station 1-A is lifted to a direct current port voltage target value;
2.1.4 The receiving end station 2-A is unlocked by adopting the same method as the steps 2.1.1) to 2.1.3), and the direct current port voltage of the receiving end station is lifted to the direct current port voltage target value.
Preferably, in the step 2.1.1), the command value of the constant dc voltage controller of the receiving station 1-a may be set to U 1Adr =425 kV, the command value of the constant reactive power controller can be set to Q 1Ar ＝0Mvar。
Preferably, in the step 2.1.2), the preset dc voltage condition is: Δt (delta t) sud At any time within a period of 300ms, there is U 1Ad ∈[420.75，429.25]kV, wherein U 1Ad Is the measured value of the direct current port voltage of the receiving end station 1-A.
Preferably, in the step 2.1.2), the command value of the constant dc voltage controller of the receiving station 1-a may be updated to U 1Adr =425+10 Δt kV, where Δt is a period of the current time from the command value update time, and Δt is less than or equal to 7.5s.
Preferably, in the step 2.1.3), the preset dc voltage boost completion condition is:
Δt sud at any time within the 300ms period, there is an actual measurement value U of the dc port voltage of the receiving station 1-a 1Ad ∈[495，505]kV, and the actual reactive power measured value Q of the receiving terminal station 1A ∈[-1，1]Mvar。
Preferably, in the step 2.2), the method for unlocking the terminal station 1-B, lifting the ac bus voltage of the terminal station to the ac voltage target value, closing the ac line breaker of the terminal station 2-B, and then unlocking the terminal station 2-B includes:
2.2.1 Setting a fixed alternating voltage controller instruction value of the transmitting end station 1-B, rising according to a first preset slope, setting a fixed frequency controller instruction value of the transmitting end station, and then unlocking the transmitting end station;
2.2.2 When the command value of the fixed alternating voltage controller of the transmitting end station 1-B rises to a preset alternating voltage threshold value, keeping the command value unchanged;
2.2.3 When the actual measurement value of the alternating current bus voltage of the sending terminal station 1-B meets the preset alternating current bus voltage condition, setting the instruction value of the fixed alternating current voltage controller of the sending terminal station to slowly rise to the alternating current bus voltage target value according to a second preset slope, so that the actual measurement value of the alternating current bus voltage of the sending terminal station slowly rises;
2.2.4 When the actual measurement value of the alternating current bus voltage of the sending terminal station 1-B meets the preset alternating current voltage lifting completion condition, judging that the alternating current bus voltage of the sending terminal station is lifted to an alternating current bus voltage target value;
2.2.5 Ac line breaker for closing the transmitting station 2-B, setting the command value P of the fixed active power controller of the transmitting station 2Br =0, constant reactive power controller command value Q 2Br =0, then unlock the end station.
Preferably, in the above step 2.2.1), the command value of the ac voltage controller of the transmitting end station 1-B may be set as:
U 1Bacr ＝23Δt kV
wherein U is 1Bacr The ac voltage controller command value for the sending end station 1-B.
The fixed frequency controller command value may be set to:
f r ＝50Hz
wherein f r Is a constant frequency controller command value.
Preferably, in the step 2.2.2), the preset ac voltage threshold may be set to 85% of the ac voltage target value of the transmitting ac bus, i.e., 195.5kV.
Preferably, in the step 2.2.3), the preset ac bus voltage condition is:
Δt suac ＝300m s u is arranged at any time in the period Bac ∈[193.545，197.455]kV, wherein U Bac The measured value is the alternating current bus voltage of the sending end station; .
Preferably, in the step 2.2.3), the command value of the ac voltage controller of the transmitting terminal station 1-B is slowly increased to the target value of the ac bus voltage according to the second preset slope, which may be represented as U 1Bacr =195.5+4.6xΔtkv, where Δt+.7.5 s.
Preferably, in the step 2.2.4), the preset ac voltage boost completion condition is:
Δt suac at any time in the period, there is an actual measurement value U of the AC bus voltage of the transmitting station Bac ∈[227.7，232.3]kV。
In a preferred embodiment, in the step 3), the method for respectively increasing the power of the forward dc system and the power of the reverse dc system until the actual measured value of the active power of the receiving end station in the outgoing system reaches the rated power thereof includes the following steps:
3.1 The instruction value of the active power controller of the transmitting station 2-B is lifted in an inclined way until the actual measurement value of the active power of the receiving station 1-A reaches the rated power of the receiving station 1-A, and the forward high-load test operation is kept for the required time;
3.2 The instruction value of the fixed active power controller of the sending end station 2-B is gradually reduced to zero and then is reversely and gradually lifted until the actual measured value of the active power of the receiving end station 2-A reaches the rated power, and the operation of the reverse heavy load test is maintained for the required time.
Preferably, in the step 3.1), the method for ramping up the command value of the active power controller of the transmitting end station 2-B until the actual measured value of the active power of the receiving end station 1-a reaches the rated power thereof includes:
3.1.1 Setting the instruction value of the fixed active power controller of the transmitting station 2-B to be obliquely lifted until the instruction value of the fixed active power controller of the transmitting station is lifted to a preset forward active power threshold value, and keeping the instruction value;
3.1.2 When the actual measured value of the active power of the transmitting station 2-B meets the preset forward active power condition, updating the instruction value of the fixed active power controller of the transmitting station to be stepwise increased until the actual measured value of the active power of the receiving station 1-A meets the preset forward active power lifting completion condition, and recording and maintaining the instruction value P of the active power of the transmitting station 2-B at the moment 2Bqr While keeping the reactive power command value at zero.
Preferably, in the above step 3.1.1), the fixed active power controller command value of the transmitting end station 2-B may be set as follows:
P 2Br ＝150×Δt MW
wherein P is 2Br Active power controller finger for end station 2-BLetting the value; p (P) n Is the monopole rated active power of the transmitting station. I.e. to set the fixed active power controller command value P of the transmitting end station 2-B 2Br At a slope of 0.1P n Rapidly rises.
More preferably, in the step 3.1.1) above, the preset forward active power threshold may be set to 85% of the unipolar rated active power of the transmitting end station, i.e. 1275MW.
Preferably, in the step 3.1.2), the preset forward active power condition is: Δt (delta t) sp At any time in the period, P is 2B ∈[1262.25，1287.75]MW, where P 2B The actual measurement value of the active power of the transmitting station 2-B;
the preset forward active power boost completion conditions are: Δt (delta t) sp At any time in the period, P is 1A ∈[1485，1515]MW, where P 1A The actual measurement value of the active power of the receiving end station 1-A; .
Preferably, in the step 3.1.2), the step-up of the command value of the fixed active power controller of the transmitting end station 2-B may be represented as P 2Br (nΔt s )＝P 2Br (nΔt s -Δt s ) +15MW. Wherein t is 0 P is the preset forward active power condition meeting time 2Br (t 0 )＝1275MW，1≤n<15。
Preferably, in the step 3.2), the method for ramping down the command value of the fixed active power controller of the transmitting end station 2-B to zero and then ramping up reversely until the actual measured active power value of the receiving end station 2-a reaches the rated power thereof includes:
3.2.1 Setting a command value of the active power controller of the transmitting station 2-B to be inclined to zero and then reversely inclined to be lifted until the active power controller of the transmitting station is lifted to a preset reverse active power threshold value, and keeping the command value;
3.2.2 When the actual measured value of the active power of the transmitting end station 2-B meets the preset reverse active power condition, updating the instruction value of the fixed active power controller of the transmitting end station to be in a stepwise ascending mode until the actual measured value of the active power of the receiving end station 2-A meets the reverse active power lifting completion condition, and recording and keeping the active power instruction of the transmitting end station 2-B at the momentLet the value P' 2Bqr The method comprises the steps of carrying out a first treatment on the surface of the While keeping the reactive power command at zero.
Preferably, in the above step 3.2.1), the instruction value of the active power controller set by the transmitting end station 2-B may be set as follows:
P 2Br ＝P 2Bqr -150×Δt
more preferably, the preset reverse active power threshold is set to: p (P) 2Br ＝-1500MW。
Preferably, in the step 3.2.2), the preset reverse active power condition is: Δt (delta t) sp At any time in the period, there is an actual measured value P of the active power of the transmitting end station 2-B 2B ∈[-1262.25，-1287.75]MW；
The preset reverse active power boost completion conditions are: Δt (delta t) sp At any time in the period, there is an actual measured value P of the active power of the transmitting end station 2-B 2B ∈[-1485，-1515]MW。
Preferably, in the step 3.2.2), the fixed active power controller command value of the transmitting station 2-B is set to be a stepwise increase, which may be expressed as P 2Br (nΔt s )＝P 2Br (nΔt s -Δt s ) -15MW. Wherein t is 0 P is the preset reverse active power condition meeting time 2Br (t 0 )＝-1275MW，1≤n<15。
The foregoing embodiments are merely illustrative of the present invention, and various implementation steps and the like may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.

Claims (6)

1. The large-load test control method for the new energy sent out by flexible direct current is characterized by comprising the following steps of:
setting a connection mode and a steady-state control mode of a receiving end station and a sending end station in a first sending system and a second sending system, and charging the receiving end station and the sending end station of the two sending systems, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level;
unlocking a receiving end station and a sending end station in a first sending system and a second sending system respectively, and lifting direct current port voltage of the receiving end station in the two sending systems and alternating current bus voltage of the sending end station in the first sending system to target values;
respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the first sending system or the second sending system reaches the rated power;
The method for setting the connection mode and the steady-state control mode of the receiving station and the sending station in the first sending system and the second sending system and charging the receiving station and the sending station of the two sending systems so that the average working voltage of all the sub-modules in the receiving station and the sending station in the two sending systems is kept at a rated value level comprises the following steps: operating switches of a receiving end station and a sending end station in the first sending system and the second sending system, so that direct current sides of the receiving end station and the sending end station in the two sending systems are in a polar connection state, and alternating current sides are disconnected with an alternating current bus; setting steady-state control modes of a receiving end station and a sending end station of a first sending system and a second sending system, so that an active power circulation mode is presented between the first sending system and the second sending system; charging the receiving end station and the sending end station of the first sending system and the second sending system in sequence, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level;
the method for unlocking the receiving end station and the sending end station in the first sending system and the second sending system respectively and improving the direct current port voltage of the receiving end station in the two sending systems and the alternating current bus voltage of the sending end station in the first sending system to target values comprises the following steps: when an unlocking instruction of the sending system is received, sequentially unlocking receiving end stations of the first sending system and the second sending system, and lifting direct current port voltages of the two receiving end stations to a direct current port voltage target value; unlocking a transmitting end station in the first transmitting system, lifting the alternating current bus voltage of the transmitting end station to an alternating current voltage target value, closing an alternating current incoming line breaker of the transmitting end station in the second transmitting system, and unlocking the transmitting end station in the second transmitting system;
The method for respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the transmitting end station or the receiving end station in the outgoing system reaches the rated power thereof comprises the following steps: the instruction value of the active power controller is determined by the transmitting end station of the second transmitting system to be lifted in a slope manner until the actual measured value of the active power of the receiving end station of the first transmitting system reaches the rated power, and the operation of the forward high-load test is kept for the required time; the instruction value of the fixed active power controller of the transmitting end station of the second transmitting system is obliquely reduced to zero and then reversely and obliquely lifted until the actual measured value of the active power of the receiving end station of the second transmitting system reaches the rated power, and the operation of the reverse heavy load test is kept for the required time;
the method for obliquely lifting the instruction value of the active power controller of the second sending system sending end station until the actual measured value of the active power of the first sending system receiving end station reaches the rated power of the first sending system sending end station comprises the following steps: setting a command value of a fixed active power controller of a transmitting end station of a second transmission system to be obliquely lifted until the command value of the fixed active power controller of the transmitting end station is lifted to a preset forward active power threshold value, and keeping the command value; when the actual measured value of the active power of the transmitting end station of the second transmitting system meets the preset forward active power condition, updating the instruction value of the active power controller of the transmitting end station to be in a stepwise jump up mode until the actual measured value of the active power of the receiving end station of the first transmitting system meets the preset forward active power lifting completion condition, recording and keeping the actual value of the active power of the transmitting end station of the second transmitting system at the moment, and keeping the reactive power instruction value at zero;
The method for obliquely reducing the instruction value of the fixed active power controller of the transmitting end station of the second transmitting system to zero and then reversely obliquely lifting until the actual measured value of the active power of the receiving end station of the second transmitting system reaches the rated power of the receiving end station of the second transmitting system comprises the following steps: setting a command value of a fixed active power controller of a transmitting terminal station of a second external transmission system, and then lifting the command value in a reverse slope manner after the command value is reduced to zero in a slope manner until the fixed active power controller of the transmitting terminal station is lifted to a preset reverse active power threshold value, and keeping the command value; when the actual measured value of the active power of the transmitting end station of the second external transmission system meets the preset reverse active power condition, updating the instruction value of the fixed active power controller of the transmitting end station to be in a stepwise jump up until the actual measured value of the active power of the receiving end station of the second external transmission system meets the reverse active power lifting completion condition, and recording and maintaining the active power instruction value of the transmitting end station of the second external transmission system at the moment; while keeping the reactive power command at zero.
2. The method for controlling the heavy load test of the flexible direct current outgoing of the new energy source according to claim 1, wherein the method for operating the switches of the receiving end station and the sending end station in the first outgoing system and the second outgoing system so that the direct current sides of the receiving end station and the sending end station in the two outgoing systems are in a polar connection state and the alternating current sides are disconnected from the alternating current bus comprises the following steps:
Sequentially and automatically detecting and operating an alternating current/direct current switch of a receiving end station of a first sending system and a receiving end station of a second sending system, so that receiving end alternating current buses accessed by the two receiving end stations operate in a combined mode, the receiving end alternating current buses are communicated with a receiving end alternating current power grid, and meanwhile, receiving end station alternating current incoming line breakers in the first sending system and the second sending system are in a switching-off state;
and sequentially and automatically detecting and operating the AC/DC switches of the sending end stations of the first sending system and the second sending system, so that the sending end AC buses accessed by the two sending end stations operate in a combined mode, the sending end AC buses are disconnected from a new energy electric field, and meanwhile, the AC inlet circuit breakers of the sending end stations in the first sending system and the second sending system are respectively in a switching-on and switching-off state.
3. The method for controlling the heavy load test of the new energy sent out by flexible direct current according to claim 2, wherein the method for sequentially charging the receiving station and the sending station of the first sending system and the second sending system so that the average working voltage of all the sub-modules in the receiving station and the sending station in the two sending systems is kept at a rated value level comprises the following steps:
closing an alternating current incoming line breaker of a receiving end station in a first outgoing system, and carrying out uncontrolled charging, controllable charging and dynamic voltage equalizing control on the receiving end station and the sending end station of the first outgoing system through a receiving end alternating current power grid, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the first outgoing system is kept at a rated value level;
By adopting the method for charging the receiving end station and the sending end station in the first sending system, the receiving end station and the sending end station in the second sending system are charged.
4. The method for controlling the heavy load test of the flexible direct current outgoing of the new energy source according to claim 1, wherein the method for sequentially unlocking the receiving end stations of the first outgoing system and the second outgoing system and raising the direct current port voltage of the two receiving end stations to the direct current port voltage target value comprises the following steps:
setting command values of a fixed direct current voltage controller and a fixed reactive power controller of a receiving end station of a first delivery system, and then unlocking the receiving end station;
when the measured value of the direct current port voltage of the receiving end station of the first sending system meets the preset direct current voltage condition, setting the instruction value of the constant direct current voltage controller of the receiving end station to rise to the target value of the direct current port voltage according to the preset slope, so that the measured value of the direct current port voltage of the receiving end station rises;
when the measured value of the direct current port voltage and the measured value of the reactive power of the receiving end station of the first sending system meet the preset direct current voltage lifting completion condition, judging that the direct current port voltage of the receiving end station of the first sending system is lifted to a direct current port voltage target value;
The method for unlocking the receiving end station of the first sending system is adopted to unlock the receiving end station of the second sending system, and the direct current port voltage of the receiving end station of the second sending system is lifted to the direct current port voltage target value.
5. The method for controlling the heavy load test of the flexible direct current outgoing of the new energy source according to claim 1, wherein the method for unlocking the terminal station in the first outgoing system, lifting the alternating current bus voltage of the terminal station to the alternating current voltage target value, closing the alternating current incoming line breaker of the terminal station of the second outgoing system, and then unlocking the terminal station in the second outgoing system comprises the following steps:
setting a fixed alternating current voltage controller instruction value of a transmitting end station of a first transmitting system, rising according to a first preset slope, setting a fixed frequency controller instruction value of the transmitting end station, and then unlocking the transmitting end station;
when the command value of the fixed alternating voltage controller of the transmitting end station of the first transmitting system rises to a preset alternating voltage threshold value, keeping the command value unchanged;
when the actual measurement value of the alternating current bus voltage of the sending end station of the first sending system meets the preset alternating current bus voltage condition, setting the instruction value of the fixed alternating current voltage controller of the sending end station to rise to the alternating current bus voltage target value according to the second preset slope, so that the actual measurement value of the alternating current bus voltage of the sending end station rises;
When the actual measurement value of the alternating current bus voltage of the sending end station of the first sending system meets the preset alternating current voltage lifting completion condition, judging that the alternating current bus voltage of the sending end station is lifted to an alternating current bus voltage target value;
closing an alternating current incoming line breaker of a transmitting end station of a second transmitting system, and setting a command value of a fixed active power controller of the transmitting end stationP 2Br =0, constant reactive power controller command valueQ 2Br =0, then unlock the end station.
6. A new energy sent out by flexible direct current big load test control system, characterized by comprising:
the test preparation unit is used for setting the connection mode and the steady-state control mode of the receiving end station and the sending end station in the first sending system and the second sending system, and charging the receiving end station and the sending end station of the two sending systems, so that the average working voltage of all the sub-modules is kept at the rated value level; setting a connection mode and a steady-state control mode of a receiving station and a sending station in the first sending system and the second sending system, and charging the receiving station and the sending station of the two sending systems, so that average working voltages of all sub-modules in the receiving station and the sending station in the two sending systems are kept at rated values, and the method comprises the following steps: operating switches of a receiving end station and a sending end station in the first sending system and the second sending system, so that direct current sides of the receiving end station and the sending end station in the two sending systems are in a polar connection state, and alternating current sides are disconnected with an alternating current bus; setting steady-state control modes of a receiving end station and a sending end station of a first sending system and a second sending system, so that an active power circulation mode is presented between the first sending system and the second sending system; charging the receiving end station and the sending end station of the first sending system and the second sending system in sequence, so that the average working voltage of all sub-modules in the receiving end station and the sending end station in the two sending systems is kept at a rated value level;
The unlocking control unit is used for unlocking the receiving end station and the sending end station of the first sending system and the second sending system respectively, and improving the direct current port voltage of the receiving end station in the two sending systems and the alternating current bus voltage of the sending end station in the first sending system to target values; unlocking a receiving end station and a sending end station in a first sending system and a second sending system respectively, and lifting direct current port voltage of the receiving end station in the two sending systems and alternating current bus voltage of the sending end station in the first sending system to target values, wherein the method comprises the following steps: when an unlocking instruction of the sending system is received, sequentially unlocking receiving end stations of the first sending system and the second sending system, and lifting direct current port voltages of the two receiving end stations to a direct current port voltage target value; unlocking a transmitting end station in the first transmitting system, lifting the alternating current bus voltage of the transmitting end station to an alternating current voltage target value, closing an alternating current incoming line breaker of the transmitting end station in the second transmitting system, and unlocking the transmitting end station in the second transmitting system;
the high-load test control unit is used for respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the receiving end station in the first sending system or the second sending system reaches the rated power; the method for respectively increasing the power of the forward direct current system and the power of the reverse direct current system until the actual measured value of the active power of the transmitting end station or the receiving end station in the outgoing system reaches the rated power thereof comprises the following steps: the instruction value of the active power controller is determined by the transmitting end station of the second transmitting system to be lifted in a slope manner until the actual measured value of the active power of the receiving end station of the first transmitting system reaches the rated power, and the operation of the forward high-load test is kept for the required time; the instruction value of the fixed active power controller of the transmitting end station of the second transmitting system is obliquely reduced to zero and then reversely and obliquely lifted until the actual measured value of the active power of the receiving end station of the second transmitting system reaches the rated power, and the operation of the reverse heavy load test is kept for the required time;
The method for obliquely lifting the instruction value of the active power controller of the second sending system sending end station until the actual measured value of the active power of the first sending system receiving end station reaches the rated power of the first sending system sending end station comprises the following steps: setting a command value of a fixed active power controller of a transmitting end station of a second transmission system to be obliquely lifted until the command value of the fixed active power controller of the transmitting end station is lifted to a preset forward active power threshold value, and keeping the command value; when the actual measured value of the active power of the transmitting end station of the second transmitting system meets the preset forward active power condition, updating the instruction value of the active power controller of the transmitting end station to be in a stepwise jump up mode until the actual measured value of the active power of the receiving end station of the first transmitting system meets the preset forward active power lifting completion condition, recording and keeping the actual value of the active power of the transmitting end station of the second transmitting system at the moment, and keeping the reactive power instruction value at zero;
the method for obliquely reducing the instruction value of the fixed active power controller of the transmitting end station of the second transmitting system to zero and then reversely obliquely lifting until the actual measured value of the active power of the receiving end station of the second transmitting system reaches the rated power of the receiving end station of the second transmitting system comprises the following steps: setting a command value of a fixed active power controller of a transmitting terminal station of a second external transmission system, and then lifting the command value in a reverse slope manner after the command value is reduced to zero in a slope manner until the fixed active power controller of the transmitting terminal station is lifted to a preset reverse active power threshold value, and keeping the command value; when the actual measured value of the active power of the transmitting end station of the second external transmission system meets the preset reverse active power condition, updating the instruction value of the fixed active power controller of the transmitting end station to be in a stepwise jump up until the actual measured value of the active power of the receiving end station of the second external transmission system meets the reverse active power lifting completion condition, and recording and maintaining the active power instruction value of the transmitting end station of the second external transmission system at the moment; simultaneously keeping the reactive power instruction to be zero;
The acquisition unit is used for acquiring the relevant actual measurement values of the two delivery systems and sending the relevant actual measurement values to the test preparation unit, the unlocking control unit and the heavy load control unit.
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