CN116632860B - Reactive replacement method, reactive replacement device, reactive replacement equipment and reactive replacement medium for new energy station - Google Patents

Reactive replacement method, reactive replacement device, reactive replacement equipment and reactive replacement medium for new energy station Download PDF

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CN116632860B
CN116632860B CN202310907334.6A CN202310907334A CN116632860B CN 116632860 B CN116632860 B CN 116632860B CN 202310907334 A CN202310907334 A CN 202310907334A CN 116632860 B CN116632860 B CN 116632860B
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reactive
value
new energy
compensator
replacement
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CN116632860A (en
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雍正
王运雷
盛洁
张绍勋
王勤
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Sprixin Technology Co ltd
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Sprixin Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • 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
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention provides a reactive power replacement method, a reactive power replacement device, reactive power replacement equipment and a reactive power replacement medium for a new energy station, belonging to the technical field of electric power, wherein the reactive power replacement method comprises the following steps: acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit; comparing the current voltage value with the target voltage value to obtain a first comparison result; determining an adjusting sequence of the static reactive power compensator and the new energy unit, a first adjusting target value of the static reactive power compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive power value of the static reactive power compensator; based on the adjusting sequence of the static reactive compensator and the new energy unit, the first adjusting target value and the second adjusting target value, the current reactive value of the static reactive compensator is subjected to reactive replacement through the current reactive value of the new energy unit, so that the stability of voltage in the reactive replacement process of the new energy station is optimized, and the safety of the voltage of the new energy station is improved.

Description

Reactive replacement method, reactive replacement device, reactive replacement equipment and reactive replacement medium for new energy station
Technical Field
The invention relates to the technical field of electric power, in particular to a reactive power replacement method, a reactive power replacement device, reactive power replacement equipment and reactive power replacement media for a new energy station.
Background
The automatic voltage control (Automatic Voltage Control, AVC) performs centralized monitoring and analysis calculation on the reactive voltage state of the whole network, and performs coordinated optimization control on the wide-area scattered reactive devices of the power network from the global angle, so that the automatic reactive voltage control system not only can realize automatic adjustment of reactive voltage, but also has a certain optimization function, and is an important technical means for keeping the voltage of the system stable, improving the voltage quality of the power network and the economic operation level of the whole system and improving the reactive voltage management level.
The automatic voltage control of the new energy station mainly realizes the voltage regulation by regulating the reactive power of a static reactive power compensator (Static Var Generator, SVG), a new energy unit (such as a fan, a photovoltaic inverter and the like), and the like, and generally, the automatic voltage control adopts a regulation strategy with priority of SVG. When the SVG priority strategy voltage is regulated to be within the threshold value, reactive power of the SVG is replaced by reactive power of the unit. And the reactive power of SVG is replaced by the reactive power of the unit, so that the reactive power regulation cost is reduced.
At present, reactive power replacement strategies are to calculate reactive power adjustable margin of a unit, reactive power of SVG is adjusted to 0MVar as much as possible at one time, and reactive power with large step length can cause voltage to fluctuate out of dead zones again, so that the voltage of a power grid is unstable.
Disclosure of Invention
The invention provides a reactive replacement method, device, equipment and medium for a new energy station, which are used for solving the defects of unstable voltage and poor safety existing in reactive replacement of the new energy station in the prior art and improving the voltage stability in the reactive replacement process of the new energy station.
The invention provides a reactive power replacement method of a new energy station, which comprises the following steps:
acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit;
comparing the current voltage value with a target voltage value to obtain a first comparison result;
determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
and performing reactive replacement on the current reactive value of the static reactive compensator through the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value.
According to the reactive power replacement method for the new energy station provided by the invention, before the reactive power replacement is carried out on the current reactive power value of the static reactive power compensator by the current reactive power value of the new energy unit, the reactive power replacement method further comprises the following steps:
determining a replacement step length based on the voltage reactive sensitivity coefficient of the new energy station and the voltage regulation dead zone of the new energy station;
acquiring a zero drift dead zone value of the static reactive power compensator and an adjustment margin of the new energy unit;
comparing the current reactive power value of the static reactive power compensator with the zero drift dead zone value of the static reactive power compensator to obtain a second comparison result;
and determining reactive power replacement based on the second comparison result, the replacement step length and the adjustment margin of the new energy unit.
According to the reactive power replacement method for the new energy station provided by the invention, the reactive power replacement power determination method comprises the following steps:
when the current reactive value of the static reactive compensator is greater than the upper limit of the zero drift dead zone value of the static reactive compensator, determining the reactive replacement power by adopting a formula (1):
(1)
and when the current reactive power value of the static reactive power compensator is smaller than the lower limit of the zero drift dead zone value of the static reactive power compensator, determining the reactive replacement power by adopting a formula (2):
(2)
wherein the saidFor the reactive replacement power, the +.>For the upper limit of the adjustment margin of the new energy unit,/->For the lower limit of the adjustment margin of the new energy unit,/for the new energy unit>For the current reactive value of the static var compensator, and (2)>For the substitution step.
According to the reactive power replacement method for the new energy station provided by the invention, the determining of the adjusting sequence of the static reactive power compensator and the new energy unit, the first adjusting target value of the static reactive power compensator and the second adjusting target value of the new energy unit comprises the following steps:
if the current voltage value is larger than the target voltage value and the current reactive value of the static reactive compensator is larger than zero, firstly adjusting the static reactive compensator and then adjusting the new energy unit;
determining the first adjustment target value by formula (3);
（3）
determining the second adjustment target value by formula (4);
（4）
if the current voltage value is larger than the target voltage value and the current reactive value of the static reactive compensator is smaller than zero, the new energy unit is firstly regulated, and then the static reactive compensator is regulated;
determining the second adjustment target value by formula (5);
（5）
determining the first adjustment target value by formula (6);
（6）
wherein ,for the first regulation target value, +.>For the second regulation target value, +.>And the current reactive value of the new energy unit.
According to the reactive power replacement method for the new energy station, provided by the invention, the method further comprises at least one of the following steps:
if the current voltage value is smaller than the target voltage value and the current reactive value of the static reactive compensator is larger than zero, the new energy unit is firstly regulated, and then the static reactive compensator is regulated;
determining the first adjustment target value by formula (7);
（7）
determining the second adjustment target value by formula (8);
（8）
if the current voltage value is smaller than the target voltage value and the current reactive value of the static reactive compensator is smaller than zero, firstly adjusting the static reactive compensator and then adjusting the new energy unit;
determining the second adjustment target value by formula (9);
（9）
determining the first adjustment target value by formula (10);
（10）。
the reactive power replacement method for the new energy station provided by the invention further comprises the following steps:
and stopping reactive replacement of the static reactive compensator when the first regulation target value is in the zero-drift dead zone of the static reactive compensator.
The invention also provides a reactive power replacement device of the new energy station, which comprises:
the acquisition module is used for acquiring the current voltage value of the new energy station, the current reactive value of the static reactive compensator and the current reactive value of the new energy unit;
the comparison module is used for comparing the current voltage value with the target voltage value to obtain a first comparison result;
the determining module is used for determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
and the replacement module is used for carrying out reactive replacement on the current reactive value of the static reactive compensator through the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value.
According to the reactive power replacement device of the new energy station provided by the invention, the determining module comprises:
a first determining unit, configured to determine a replacement step size based on a voltage reactive sensitivity coefficient of the new energy station and a voltage adjustment dead zone of the new energy station;
the acquisition unit is used for acquiring the zero drift dead zone value of the static reactive power compensator and the adjustment margin of the new energy unit;
the comparison unit is used for comparing the current reactive power value of the static reactive power compensator with the zero drift dead zone value of the static reactive power compensator to obtain a second comparison result;
and the second determining unit is used for determining reactive power replacement based on the second comparison result, the replacement step length and the adjustment margin of the new energy unit.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the reactive replacement method of the new energy station is realized when the processor executes the program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a reactive replacement method for a new energy station as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a reactive replacement method for a new energy station as described in any one of the above.
According to the reactive power replacement method, the reactive power replacement device, the reactive power replacement equipment and the reactive power replacement medium for the new energy station, the current voltage value of the new energy station, the current reactive power value of the static reactive power compensator and the current reactive power value of the new energy unit are obtained, the adjustment sequence of the static reactive power compensator and the new energy unit and the respective adjustment values in the reactive power replacement process are determined based on the magnitude relation between the current voltage value and the target voltage value and the current reactive power value of the static reactive power compensator, the reactive power replacement is carried out on the static reactive power compensator through the reactive power of the new energy unit, the situation that the dead zone is caused by voltage fluctuation caused by inconsistent speed of simultaneous adjustment of the static reactive power compensator and the new energy unit is avoided to the greatest extent, the stability of the voltage in the reactive power replacement process of the new energy station is optimized, and the voltage safety of the new energy station is improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a reactive replacement method for a new energy station provided by the invention;
FIG. 2 is a second schematic flow chart of the reactive replacement method of the new energy station provided by the invention;
FIG. 3 is a schematic diagram of a reactive power replacement device for a new energy station according to the present invention;
FIG. 4 is a second schematic diagram of the reactive power replacement device of the new energy station according to the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate a clearer understanding of various embodiments of the present invention, some relevant background knowledge is first presented as follows.
The AVC is a control system deployed at the end of the new energy station and is used for receiving an AVC master station instruction of the power grid, the master station instruction comprises a voltage instruction and a reactive power instruction, and the voltage/reactive power of the grid-connected point meets the master station requirement by regulating reactive power equipment in the station, so that the AVC is a main control means for controlling the reactive power of the new energy station by the power grid. A static reactive compensator and a new energy unit are arranged in the new energy station.
Reactive value: in particular reactive power values, it means that in an ac circuit with reactance, the electric or magnetic field absorbs energy from the power supply during a part of the period and releases energy during another part of the period, the average power being zero during the whole period, but energy is constantly exchanged between the power supply and the reactive element. This energy is a prerequisite for the electrical equipment to be able to do work, and is converted periodically with the electrical energy in the grid, this part of power is called reactive power, MVar is the reactive power unit: m represents megabits, the order of units, var is the unit of reactive power, and is read.
Combining point: and a new energy station power output summarizing point. The examination of new energy is usually all at the grid-connected point.
SVG is capable of dynamically emitting and absorbing reactive power. Has the characteristics of quick response and accurate adjustment. In general, the SVG reactive capacity needs to be reserved to the maximum extent in the AVC regulation of the new energy station.
The SVG-preferred regulation strategy is generally selected for AVC. However, the margin of the SVG is suitable for transient voltage accidents and is not suitable for long-term steady-state voltage regulation; in addition, the reactive power of the SVG is converted by using the power grid, which is uneconomical for the operation of a station, so that the reactive power of the SVG is replaced by the reactive power of the unit when the voltage is regulated to be within the threshold value by using the SVG priority strategy. The reactive power of the SVG is replaced by the reactive power of the unit, so that reactive power adjustment cost is reduced, the reactive power adjustable margin of the unit is calculated in advance, reactive power is replaced to the greatest extent at a single time, no replacement sequence exists, when the adjustment rates of the SVG and the unit are inconsistent, the voltage fluctuation of grid-connected points is caused to go out of a dead zone, the voltage is unstable, and a new round of adjustment is entered, so that additional assessment is generated.
In summary, in order to improve the stability of the voltage of the grid-connected point in the reactive power replacement process of the new energy station, the embodiment of the invention provides a reactive power replacement method, a reactive power replacement device, reactive power replacement equipment and a reactive power replacement medium of the new energy station.
The reactive power replacement method of the new energy station provided by the invention can be applied to the technical field of electric power, for example, the reactive power replacement treatment field. Optionally, the reactive replacement method of the new energy station provided by the invention is realized in the new energy station. The execution subject of the present invention may be any electronic device capable of implementing the reactive replacement method of the new energy station.
The reactive replacement method, device, equipment and medium of the new energy station of the present invention are described below with reference to fig. 1 to 5.
Fig. 1 is one of flow diagrams of a reactive replacement method of a new energy station provided by the present invention, and as shown in fig. 1, the reactive replacement method of a new energy station provided by the present invention includes:
s1, acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit;
specifically, the new energy station in the embodiment of the invention is a wind farm, and can also be other forms of new energy stations, which are not limited herein; in the implementation, the new energy station comprises 10 fans, and the energy management platform of the fans, namely a fan energy pipe, carries out overall regulation and control, and the AVC receives reactive instructions at the moment; after the current voltage value of the new energy station is within the voltage regulation precision range for a certain time, the voltage is indicated to enter a stable mode, the time is generally limited to 5s, and a replacement mode is performed at the moment; if the current voltage value of the new energy station is not within the voltage regulation precision range, the regulation mode is performed, and the regulation mode is not limited herein. The voltage regulation precision of the new energy station is +/-0.5 kV, the target voltage value is 112kV, the current voltage value is 111.6kV, the voltage is in the range of 111.5kV to 112.5kV, and the voltage is kept for 5 seconds, so that a reactive replacement mode is entered;
the current voltage value of the new energy station is 111.6kV, the current reactive power of the static reactive power compensator is 5MVar, and the current reactive power value of the new energy unit is 0MVar.
S2, comparing the current voltage value with a target voltage value to obtain a first comparison result;
specifically, in this step, the magnitudes of the current voltage value and the target voltage value are compared, and the first comparison result is used to represent the magnitude relation between the current voltage value and the target voltage value.
S3, determining an adjusting sequence of the static reactive power compensator and the new energy unit, a first adjusting target value of the static reactive power compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive power value of the static reactive power compensator;
specifically, in this step, based on the magnitude relation between the current voltage value and the target voltage value, it is determined to first adjust the static var compensator, then adjust the new energy unit or first adjust the new energy unit, then adjust the static var compensator, and based on the magnitude relation between the current voltage value and the target voltage value, it is determined that the static var compensator and the new energy unit respectively adjust the target values under different conditions.
S4, reactive replacement is carried out on the static reactive compensator through the new energy unit based on the adjusting sequence of the static reactive compensator and the new energy unit, the first adjusting target value and the second adjusting target value.
Specifically, in this step, reactive replacement is performed on the static var compensator by the new energy unit based on the adjustment sequence, the first adjustment target value and the second adjustment target value acquired in the preceding step, and in a specific implementation, since the new energy unit and the static var compensator require a certain adjustment time after receiving the adjustment command, after determining the adjustment sequence, it is assumed that the new energy unit needs to be adjusted first, and then the static var compensator needs to be adjusted after waiting for a replacement period, where the replacement period is preset according to a specific device and scenario, and in this embodiment, the replacement period is 5s.
According to the reactive power replacement method for the new energy station, the current voltage value of the new energy station, the current reactive power value of the static reactive power compensator in the new energy station and the current reactive power value of the new energy unit in the new energy station are obtained, the adjustment sequence of the static reactive power compensator and the new energy unit and the respective adjustment values are determined in the reactive power replacement process based on the magnitude relation between the current voltage value and the target voltage value and the current reactive power value of the static reactive power compensator, the static reactive power compensator is subjected to reactive power replacement through the new energy unit, the condition that the voltage fluctuation is out of a dead zone due to the fact that the speed of simultaneous adjustment of the static reactive power compensator and the new energy unit is inconsistent is avoided to the greatest extent, the voltage stability in the reactive power replacement process of the new energy station is improved, and the voltage safety of the new energy station is improved.
Optionally, the step S4 further includes the following steps, and fig. 2 is a second schematic flow chart of the reactive replacement method of the new energy station provided by the present invention, as shown in fig. 2, and the step S4 further includes:
step 1, determining a replacement step length based on a voltage reactive sensitivity coefficient of a new energy station and a voltage regulation dead zone of the new energy station;
specifically, in this step, the replacement step is based on the voltage reactive sensitivity coefficient of the new energy station and the voltage regulation dead zone of the new energy station, unlike the large-step reactive replacement in the prior art, in the specific implementation, when the voltage reactive sensitivity coefficient is 10MVar/kV, the voltage regulation dead zone of the new energy station, that is, the voltage regulation precision is ±0.5kV, the replacement step must be less than 10×0.5mvar, and the replacement step is 2MVar at this time.
Step 2, obtaining a zero drift dead zone value of the static reactive compensator and an adjustment margin of the new energy unit;
specifically, in the embodiment of the invention, the zero drift dead zone value of the static var compensator in the new energy station is +/-0.1 MVar, the total adjustment margin value of the new energy unit is 20MVar, specifically, the up-adjustable margin is 10MVar, and the down-adjustable margin is 10MVar.
Step 3, comparing the current reactive value of the static reactive compensator with the zero drift dead zone value of the static reactive compensator to obtain a second comparison result;
in particular, the second comparison result is used to represent the magnitude relation of the current reactive value of the static reactive compensator and the zero drift dead zone value of the static reactive compensator.
And step 4, determining reactive power replacement based on the second comparison result, the replacement step length and the adjustment margin of the new energy unit.
According to the reactive power replacement method for the new energy station, provided by the embodiment of the invention, the replacement step length is determined through the voltage reactive power sensitivity coefficient of the new energy station and the voltage regulation dead zone of the new energy station, the dynamically-changing replacement power is determined based on the magnitude relation between the current reactive power value of the static reactive compensator and the zero-drift dead zone value of the static reactive compensator, the reactive power replacement is carried out on the static reactive compensator through the new energy unit under the double limitation by combining the regulation sequence and the dynamically-changing replacement power, the possibility that the dead zone is formed due to the voltage fluctuation caused by the overlarge replacement step length and the overlarge single replacement power is avoided to the greatest extent, the stability of the voltage is improved, the redundant AVC examination is avoided, and the economic benefit of the new energy station is improved.
Optionally, the step 4 specifically includes at least one of the following cases:
when the current reactive value of the static reactive compensator is larger than the upper limit of the zero drift dead zone value of the static reactive compensator, adopting a formula (1) to determine reactive replacement power:
(1)
when the current reactive value of the static reactive compensator is smaller than the lower limit of the zero drift dead zone value of the static reactive compensator, adopting a formula (2) to determine reactive replacement power:
(2)
wherein ,for reactive replacement power, +.>Is the upper limit of the adjustment margin of the new energy unit,the lower limit of the adjustment margin of the new energy unit is +.>Is the current reactive value of the static reactive compensator,for the substitution step.
Specifically, the embodiment of the present invention will be described later with the first one of the above cases, where the current reactive value of the static reactive compensator is 5MVar, the upper limit of the zero drift dead zone value of the static reactive compensator is 0.1MVar, in which case the value of reactive replacement power is the minimum value of the three values of the upper limit of the adjustment margin of the new energy unit, the current reactive value of the static reactive compensator, and the replacement step, that is, 10MVar, 5MVar, and 2MVar, and in which case the reactive replacement power value is 2MVar.
Optionally, the step S3 includes at least one of the following:
if the current voltage value is larger than the target voltage value and the current reactive value of the static reactive compensator is larger than zero, firstly adjusting the static reactive compensator and then adjusting the new energy unit;
determining a first adjustment target value by means of equation (3);
（3）
determining a second adjustment target value by formula (4);
（4）
if the current voltage value is larger than the target voltage value and the current reactive value of the static reactive compensator is smaller than zero, the new energy unit is firstly regulated, and then the static reactive compensator is regulated;
determining a second adjustment target value by formula (5);
（5）
determining a first adjustment target value by means of equation (6);
（6）
wherein ,for the first regulation target value, +.>For the second adjustment target value,is the current reactive value of the new energy unit.
If the current voltage value is smaller than the target voltage value and the current reactive value of the static reactive compensator is larger than zero, the new energy unit is firstly regulated, and then the static reactive compensator is regulated;
determining a first adjustment target value by means of equation (7);
（7）
determining a second adjustment target value by formula (8);
（8）
if the current voltage value is smaller than the target voltage value and the current reactive value of the static reactive compensator is smaller than zero, firstly adjusting the static reactive compensator and then adjusting the new energy unit;
determining a second adjustment target value by formula (9);
（9）
determining a first adjustment target value by means of equation (10);
（10）。
optionally, the reactive replacement of the static var compensator is stopped when the first regulation target value is within a zero drift dead zone of the static var compensator.
Specifically, in this embodiment, the current voltage value is 111.6kV, the target voltage value is 112kV, the current reactive value of the static reactive compensator is 5MVar, and the current reactive value of the static reactive compensator is smaller than the target voltage value and larger than zero, then the new energy unit is adjusted first, and then the static reactive compensator is adjusted; based on the above formula (7) and formula (8), a first adjustment target value is determinedA second regulation target value. Firstly, adjusting the new energy unit, and adjusting the static reactive compensator after a replacement period, namely 5 s; after the adjustment is finished, waiting for a replacement period, returning to the step 3, comparing the current reactive power value of the static reactive power compensator with the zero drift dead zone value of the static reactive power compensator again, and sequentially determining whether to finish reactive power replacement.
In this embodiment, after the first round of replacement, the first adjustment target value of the static reactive compensator is 3MVar, that is, the current reactive value of the static reactive compensator in the new round is still greater than 0.1MVar, and the new round of adjustment is performed: the up-adjustable margin of the new energy unit is 8MVar, and the down-adjustable margin is 12MVar;
in this case the number of the cells to be processed is,the method comprises the steps of carrying out a first treatment on the surface of the If the current voltage value slightly fluctuates to 111.64kV due to external reasons at the moment and is still smaller than the target value 112, based on the situation, the new energy unit is regulated at the moment, a replacement period is waited, and then the static reactive compensator is regulatedA section; in this case the number of the cells to be processed is,，/>；
after waiting for a replacement period again, the first regulating target value of the static reactive compensator is 1MVar, namely the current reactive value of the static reactive compensator of a new round is still more than 0.1MVar, and a new round of regulation is carried out; the up-adjustable margin of the new energy unit is 6MVar, and the down-adjustable margin is 14MVar;
in this case the number of the cells to be processed is,the method comprises the steps of carrying out a first treatment on the surface of the If the current voltage value slightly fluctuates to 111.62kV due to external reasons at the moment and is still smaller than the target value 112, based on the situation, the new energy unit is firstly regulated, a replacement period is waited, and then the static reactive compensator is regulated, so that the current voltage value is still smaller than the target value 112>，；
And after waiting for a replacement period, the first regulating target value of the static reactive compensator is 0MVar, namely the current reactive value of the static reactive compensator of a new round is in a zero-drift dead zone of the static reactive compensator, and the reactive replacement of the static reactive compensator is stopped, and the replacement of the current round is finished.
According to the reactive power replacement method for the new energy station, provided by the embodiment of the invention, the replacement power in the reactive power replacement process is dynamically adjusted, and the static reactive compensator is subjected to reactive power replacement by the energy unit, so that the possibility that the dead zone is generated due to voltage fluctuation caused by overlarge replacement step length and overlarge single replacement power is avoided to the greatest extent, the voltage in the reactive power replacement process is more stable and safer, the possibility of generating redundant AVC check is avoided, and the economic benefit of the new energy station is improved.
The reactive power replacement device of the new energy station provided by the invention is described below, and the reactive power replacement device of the new energy station described below and the reactive power replacement method of the new energy station described above can be referred to correspondingly. Fig. 3 is a schematic structural diagram of a reactive power replacement device for a new energy station provided by the present invention, and as shown in fig. 3, the reactive power replacement device for a new energy station provided by an embodiment of the present invention includes:
the obtaining module 31 is configured to obtain a current voltage value of the new energy station, a current reactive value of the static reactive compensator, and a current reactive value of the new energy unit;
the comparison module 32 is configured to compare the current voltage value with the target voltage value to obtain a first comparison result;
the determining module 33 is configured to determine an adjustment sequence of the static var compensator and the new energy unit, a first adjustment target value of the static var compensator, and a second adjustment target value of the new energy unit based on the first comparison result and the current reactive value of the static var compensator;
and the replacement module 34 is configured to perform reactive replacement on the current reactive value of the static reactive compensator by the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value.
According to the reactive power replacement device for the new energy station, provided by the embodiment, through the mutual coordination among the modules, the voltage reactive power sensitivity coefficient of the new energy station and the voltage regulation dead zone of the new energy station are used for determining the replacement step length, the dynamically changing replacement power is determined based on the magnitude relation between the current reactive power value of the static reactive power compensator and the zero drift dead zone value of the static reactive power compensator, and the static reactive power compensator is subjected to reactive power replacement by the new energy unit under the double limitation by combining the adjustment sequence and the dynamically changing replacement power, so that the possibility of dead zone generation due to voltage fluctuation caused by overlarge replacement step length and overlarge single replacement power is avoided to the greatest extent, the stability of the voltage is improved, the generation of redundant AVC examination is avoided, and the economic benefit of the new energy station is improved.
Optionally, the determining module specifically includes the following units, fig. 4 is a second schematic structural diagram of a reactive replacement device of a new energy station provided by the present invention, and as shown in fig. 4, the determining module 33 provided by the embodiment of the present invention specifically includes:
a first determining unit 331 for determining a replacement step based on the voltage reactive sensitivity coefficient of the new energy station and the voltage adjustment dead zone of the new energy station;
the acquiring unit 332 is configured to acquire a zero drift dead zone value of the static reactive power compensator and an adjustment margin of the new energy unit;
a comparison unit 333, configured to compare the current reactive value of the static reactive compensator with the zero drift dead zone value of the static reactive compensator, to obtain a second comparison result;
and a second determining unit 334, configured to determine reactive replacement power based on the second comparison result, the replacement step size, and the adjustment margin of the new energy unit.
According to the reactive power replacement device for the new energy field station, provided by the embodiment of the invention, the replacement step length is determined through the first determination unit, the reactive power of each round is determined through the second determination unit, the static reactive compensator is subjected to reactive power replacement through the new energy unit, the possibility that the voltage fluctuates out of a dead zone due to overlarge replacement step length and overlarge single replacement power is avoided to the greatest extent, the voltage in the reactive power replacement process is more stable and safer, the possibility of generating redundant AVC (automatic voltage control) assessment is avoided, and the economic benefit of the new energy field station is improved.
Fig. 5 is a schematic structural diagram of an electronic device according to the present invention, and as shown in fig. 5, the electronic device may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a reactive replacement method for a new energy site, the method comprising:
acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit;
comparing the current voltage value with a target voltage value to obtain a first comparison result;
determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
and performing reactive replacement on the current reactive value of the static reactive compensator through the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the reactive replacement method of a new energy station provided by the above methods, the method comprising:
acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit;
comparing the current voltage value with a target voltage value to obtain a first comparison result;
determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
and performing reactive replacement on the current reactive value of the static reactive compensator through the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a reactive replacement method for a new energy station provided by the above methods, the method comprising:
acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit;
comparing the current voltage value with a target voltage value to obtain a first comparison result;
determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
and performing reactive replacement on the current reactive value of the static reactive compensator through the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. A reactive replacement method for a new energy station, comprising:
acquiring a current voltage value of a new energy station, a current reactive value of a static reactive compensator and a current reactive value of a new energy unit;
comparing the current voltage value with a target voltage value to obtain a first comparison result;
determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
based on the adjusting sequence of the static reactive power compensator and the new energy unit, the first adjusting target value and the second adjusting target value, reactive power replacement is carried out on the current reactive power value of the static reactive power compensator through the current reactive power value of the new energy unit;
before the reactive replacement is performed on the current reactive value of the static reactive compensator by the current reactive value of the new energy unit, the method further comprises the following steps:
determining a replacement step length based on the voltage reactive sensitivity coefficient of the new energy station and the voltage regulation dead zone of the new energy station;
acquiring a zero drift dead zone value of the static reactive power compensator and an adjustment margin of the new energy unit;
comparing the current reactive power value of the static reactive power compensator with the zero drift dead zone value of the static reactive power compensator to obtain a second comparison result;
and determining reactive power replacement based on the second comparison result, the replacement step length and the adjustment margin of the new energy unit.
2. The reactive replacement method of a new energy site according to claim 1, wherein the determining reactive replacement power comprises:
when the current reactive value of the static reactive compensator is greater than the upper limit of the zero drift dead zone value of the static reactive compensator, determining the reactive replacement power by adopting a formula (1):
(1)
and when the current reactive power value of the static reactive power compensator is smaller than the lower limit of the zero drift dead zone value of the static reactive power compensator, determining the reactive replacement power by adopting a formula (2):
(2)
wherein the saidFor the reactive replacement power, the +.>For the upper limit of the adjustment margin of the new energy unit,/->For the lower limit of the adjustment margin of the new energy unit,/for the new energy unit>For the current reactive value of the static var compensator, and (2)>For the substitution step.
3. The reactive replacement method of a new energy plant according to claim 2, wherein the determining the adjustment sequence of the static reactive compensator and the new energy plant, the first adjustment target value of the static reactive compensator, the second adjustment target value of the new energy plant, comprises:
if the current voltage value is larger than the target voltage value and the current reactive value of the static reactive compensator is larger than zero, firstly adjusting the static reactive compensator and then adjusting the new energy unit;
determining the first adjustment target value by formula (3);
（3）
determining the second adjustment target value by formula (4);
（4）
if the current voltage value is larger than the target voltage value and the current reactive value of the static reactive compensator is smaller than zero, the new energy unit is firstly regulated, and then the static reactive compensator is regulated;
determining the second adjustment target value by formula (5);
（5）
determining the first adjustment target value by formula (6);
（6）
wherein ,for the first regulation target value, +.>For the second regulation target value, +.>And the current reactive value of the new energy unit.
4. A reactive replacement method for a new energy field station according to claim 3, characterized in that the method further comprises at least one of the following:
if the current voltage value is smaller than the target voltage value and the current reactive value of the static reactive compensator is larger than zero, the new energy unit is firstly regulated, and then the static reactive compensator is regulated;
determining the first adjustment target value by formula (7);
（7）
determining the second adjustment target value by formula (8);
（8）
if the current voltage value is smaller than the target voltage value and the current reactive value of the static reactive compensator is smaller than zero, firstly adjusting the static reactive compensator and then adjusting the new energy unit;
determining the second adjustment target value by formula (9);
（9）
determining the first adjustment target value by formula (10);
（10）。
5. the reactive replacement method of a new energy field station according to any one of claims 1-4, further comprising:
and stopping reactive replacement of the current reactive value of the static reactive compensator when the first regulation target value is in the zero-drift dead zone of the static reactive compensator.
6. A reactive power replacement device for a new energy station, comprising:
the acquisition module is used for acquiring the current voltage value of the new energy station, the current reactive value of the static reactive compensator and the current reactive value of the new energy unit;
the comparison module is used for comparing the current voltage value with the target voltage value to obtain a first comparison result;
the determining module is used for determining an adjusting sequence of the static reactive compensator and the new energy unit, a first adjusting target value of the static reactive compensator and a second adjusting target value of the new energy unit based on the first comparison result and the current reactive value of the static reactive compensator;
the replacement module is used for carrying out reactive replacement on the current reactive value of the static reactive compensator through the current reactive value of the new energy unit based on the adjustment sequence of the static reactive compensator and the new energy unit, the first adjustment target value and the second adjustment target value;
the determining module includes:
a first determining unit, configured to determine a replacement step size based on a voltage reactive sensitivity coefficient of the new energy station and a voltage adjustment dead zone of the new energy station;
the acquisition unit is used for acquiring the zero drift dead zone value of the static reactive power compensator and the adjustment margin of the new energy unit;
the comparison unit is used for comparing the current reactive power value of the static reactive power compensator with the zero drift dead zone value of the static reactive power compensator to obtain a second comparison result;
and the second determining unit is used for determining reactive power replacement based on the second comparison result, the replacement step length and the adjustment margin of the new energy unit.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a reactive replacement method of a new energy station according to any one of claims 1 to 5 when the program is executed.
8. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the reactive replacement method of a new energy station according to any of claims 1 to 5.
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