CN113541184A - Power grid secondary voltage control method for offshore wind power collection area - Google Patents

Power grid secondary voltage control method for offshore wind power collection area Download PDF

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CN113541184A
CN113541184A CN202110688141.7A CN202110688141A CN113541184A CN 113541184 A CN113541184 A CN 113541184A CN 202110688141 A CN202110688141 A CN 202110688141A CN 113541184 A CN113541184 A CN 113541184A
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voltage
offshore
bus
booster station
wind power
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CN113541184B (en
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李波
李世明
林玥廷
郭英杰
戴月
汤磊
池丽娟
王志南
王鹏
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
Beijing King Star Hi Tech System Control Co Ltd
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
Beijing King Star Hi Tech System Control 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/38—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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention belongs to the technical field of automatic voltage control of power systems, and particularly relates to a secondary voltage control method of a power grid for an offshore wind power collection area. On the basis of the existing Coordinated Secondary Voltage Control (CSVC) model, firstly, the voltage of a high-voltage side bus of an offshore booster station in an offshore wind power collection area is checked, if the voltage of the high-voltage side bus of the offshore booster station is normal, a constraint condition for the high-voltage side bus of the offshore booster station of a wind field is additionally introduced into the CSVC model, so that the requirement that the solution can meet the voltage operation of the offshore part of the wind field can be ensured; if the voltage of the high-voltage side bus of the offshore booster station is out of limit, a part for correcting the voltage of the bus of the offshore booster station is added in an objective function of the CSVC model, the out-of-limit voltage of the offshore part can be eliminated through solving, and the requirement of normal operation is met.

Description

Power grid secondary voltage control method for offshore wind power collection area
Technical Field
The invention belongs to the technical field of automatic voltage control of power systems, relates to a power grid secondary voltage control method for an offshore wind power collection area, and particularly relates to an automatic voltage control method for voltage coordination of an offshore part and an onshore part of a 220kV offshore wind power plant.
Background
In recent years, combination of land and sea wind has become a preferred solution for promoting clean energy substitution in many coastal areas. Offshore wind power has become the leading edge and the highest point in the wind power technology field, and the grid-connected capacity is rapidly increased. Taking Guangdong province as an example, the installed capacity of offshore wind power is 1200 kW when the construction is started by the end of 2020. By the expected time of 2030, 23 offshore wind farms are built, the total installed capacity reaches 6685 ten thousand kW, 15 offshore wind farms are built in offshore shallow water areas, and the installed capacity is 985 ten thousand kW; 8 offshore wind farms are built in the offshore deep water region, and the installed capacity is 5700 ten thousand kW. The rapid development of large-scale offshore wind power brings new challenges to the dispatching and operation of a power grid. On one hand, the offshore wind power plant is basically constructed at the position of 100-200km along the sea, is close to the load center, is windy throughout the year and is very suitable for the active power requirement of the electric load center; on the other hand, a large-scale centralized development mode is adopted for offshore wind power, and due to the inherent intermittent characteristic of wind power generation, large-scale offshore wind power grid connection also brings great difficulty in voltage regulation and control. In the region of offshore wind power centralized grid connection, a dozen of 220kV new energy field stations are centralized grid connection, 300-400 ten thousand kW wind power generation is centralized in a small power grid region, and the regions lack reactive voltage support of conventional water and fire power plant units, so that the short circuit capacity of the system is small, and the change of offshore wind power active power generation output can cause large voltage fluctuation. And an offshore wind farm generally sends points to a main network through a submarine cable, and the large charging reactive power of the cable plays an amplification effect on voltage fluctuation, so that the voltage fluctuation of a grid-connected area is further increased.
The research of Xukudao, Guo Qing, Sunwei and the research of the multi-wind-field interlocking grid-off process analysis and simulation (power grid technology, 2014, 38 (6): 1425) 1431) in the document indicates that the offshore wind-field interlocking grid-off fault caused by voltage fluctuation is easy to occur in a new energy power generation area which is gathered and connected to a power grid in a large scale, and further the safe and stable operation of the whole power grid is influenced. In order to solve the problem, on one hand, the reactive power regulation capability of the new energy station needs to be fully utilized to provide voltage support for new energy power generation; on the other hand, reactive resources with various characteristics of the new energy station and the sending channel are reasonably regulated and controlled to realize coordination control.
The structure of a typical offshore wind energy collection area grid is shown in fig. 1. As shown in the figure, the part in each dotted line rectangular frame is an offshore wind farm, and a plurality of offshore wind farms are gathered to a 220kV gathering station. Each offshore wind farm consists of an onshore part and an offshore part, wherein the onshore part comprises a 220kV bus of an onshore switch station and an SVG reactive power compensation device; the offshore part comprises a 220kV bus of an offshore booster station and an offshore wind power generation set brought out through a 35kV bus on a booster variable low-voltage side. The offshore part and the onshore part are connected by several 220kV submarine cables, the voltage situation of which is significantly different from that of onshore switchyard buses. Therefore, for offshore wind farms, it is necessary to consider both the voltage control targets of the offshore booster station bus and the onshore switchyard bus. In a traditional automatic voltage control system (AVC), a method of coordinating two-stage voltage control is mostly adopted for conventional thermal power plants and hydraulic power plants. In the introduction, grand and san berming, et al, research on coordinated secondary voltage control (power system automation, 2005, 29 (23): 19-23) in the literature, "research on coordinated secondary voltage control" proposes a quadratic programming model for coordinated secondary voltage control, which only considers the control of a central bus in a region and a power plant high-voltage side grid-connected bus, and cannot meet the requirement of an offshore wind farm that the voltage control requirements of an offshore booster station bus and a onshore switch station bus are simultaneously considered.
Disclosure of Invention
The invention aims to provide a power grid secondary voltage control method facing an offshore wind power collection area, which considers voltage control targets of offshore and onshore buses on the basis of the existing Coordinated Secondary Voltage Control (CSVC) model so as to meet the requirements of onshore and offshore partial bus voltage operation of an offshore wind farm.
The invention provides a power grid secondary voltage control method for an offshore wind power collection area, which is characterized in that a secondary planning model, called CSVC for short, with normal voltage of a high-voltage side bus of an offshore booster station is established, the voltage of the high-voltage side bus of the offshore booster station in the offshore wind power collection area is checked, if the voltage of the high-voltage side bus of the offshore booster station is normal, a constraint condition for the high-voltage side bus of the offshore booster station of a wind field is added into the CSVC model, so that the solved model can meet the voltage operation requirement of the offshore part of the wind field; if the voltage of the high-voltage side bus of the offshore booster station is out of limit, a part for correcting the voltage of the bus of the offshore booster station is added in an objective function of the CSVC model, the out-of-limit voltage of the offshore part is eliminated by solving the model, and the voltage control requirements of the offshore and onshore buses in normal operation are met.
The invention provides a secondary voltage control method of a power grid for an offshore wind power collection area, which has the characteristics and advantages that:
the invention relates to a power grid secondary voltage control method facing an offshore wind power collection area, which is characterized in that different power grid secondary voltage control calculation models are constructed according to the operation state of the offshore wind power collection area on the basis of the existing Coordinated Secondary Voltage Control (CSVC) model; meanwhile, the voltage out-of-limit of the target offshore part is considered, the voltage control of offshore and onshore buses in normal operation is met, different calculation models are built according to the operation state of the offshore wind power collection area, and the requirements of onshore and offshore part bus voltage operation of an offshore wind power plant can be met simultaneously.
Drawings
Fig. 1 is a schematic diagram of a power grid structure of an offshore wind power collection area in the prior art.
Fig. 2 is a schematic diagram of a 220kV land station offshore wind power collection area power grid structure according to an embodiment of the present invention.
Detailed Description
The invention provides a power grid secondary voltage control method for an offshore wind power collection area, which is characterized in that a secondary planning model, called CSVC for short, with normal voltage of a high-voltage side bus of an offshore booster station is established, the voltage of the high-voltage side bus of the offshore booster station in the offshore wind power collection area is checked, if the voltage of the high-voltage side bus of the offshore booster station is normal, a constraint condition for the high-voltage side bus of the offshore booster station of a wind field is added into the CSVC model, so that the solved model can meet the voltage operation requirement of the offshore part of the wind field; if the voltage of the high-voltage side bus of the offshore booster station is out of limit, a part for correcting the voltage of the bus of the offshore booster station is added in an objective function of the CSVC model, the out-of-limit voltage of the offshore part is eliminated by solving the model, and the voltage control requirements of the offshore and onshore buses in normal operation are met.
The method for controlling the secondary voltage of the power grid comprises the following specific steps of:
(1) when the control period comes, the voltage V of the high-voltage side bus of the offshore booster station of each wind farm in the offshore wind power collection area in the power grid is checkedS；
(2) For the voltage V of the high-voltage side bus of the offshore booster station in the step (1)SJudging if the high-voltage side bus voltage V of the booster stationSIn the normal range, i.e. satisfies
Figure BDA0003125324930000034
Wherein
Figure BDA0003125324930000035
And
Figure BDA0003125324930000036
voltage lower limit and voltage of high-voltage side bus of offshore booster station of offshore wind fieldAnd in the upper limit, the voltage optimization of a 220kV bus (namely a central bus) of a wind power collection station (namely a wind power on-grid substation) in the offshore wind power collection area is taken as a target, a high-voltage side bus of a onshore switch station is taken as a control bus, and the voltage of the high-voltage side bus of the offshore booster station is taken as a constraint condition, and the following calculation steps are performed on the offshore wind power collection area:
(2-1) establishing a quadratic programming model with normal high-voltage side bus voltage of the offshore booster station:
Figure BDA0003125324930000031
Figure BDA0003125324930000032
the formula (1) is an objective function of a quadratic programming model, and the minimum variation delta Q of a wind power equivalent machine is calculated by taking the optimization of the central bus voltage as a targetgParameter thetagFor the target part of the balance of reactive power output of each wind field in the offshore wind power collection area, Wp、WqRespectively a voltage control target weight coefficient and a reactive power source balance control target weight coefficient, VpAnd
Figure BDA0003125324930000033
current voltage and voltage regulation target values (given by the self-tertiary control module), C, of the neutral bus, respectivelypgA sensitivity matrix of wind field equivalent unit reactive power regulating quantity to a central bus voltage in an offshore wind power collection area; for the calculation of the above parameters, reference may be made to Guoqing, Sunworu, Zenberging et al, "research on harmonizing two-stage voltage control" (power system automation, 2005, 29 (23): 19-23) in the literature, "research on harmonizing two-stage voltage control" (power system automation, 2005, 29 (23): 19-23) on the parameters Θg、Wp、WqAnd a sensitivity matrix Cg、Csg、CpgThe calculation methods of (2) are all introduced.
Formula (2) is a set of constraints for formula (1), for constraint C0In, ChgWind field equivalent unit regulating quantity in offshore wind power collection areaFor the voltage sensitivity matrix of each wind farm onshore switchyard busbar,
Figure BDA0003125324930000041
for controlling the single step maximum adjustment quantity of the bus, the adjustment delta Q of the wind power equivalent machine is representedgThe voltage variation of control bus should not be greater than
Figure BDA0003125324930000042
Constraint C1In, VH、
Figure BDA0003125324930000043
And
Figure BDA0003125324930000044
respectively representing the current voltage, the upper voltage limit value and the lower voltage limit value of the control bus and the adjustment delta Q of the wind power equivalent machinegThe voltage of the rear control bus is within the range of the upper limit and the lower limit; constraint C2In, CsgRepresenting wind power equivalent machine adjustment delta Q for the wind farm equivalent set adjustment quantity in the offshore wind power collection area to the bus voltage sensitivity matrix of each wind farm offshore booster stationgThe voltage of a high-voltage side bus of the rear booster station is within the upper and lower limit ranges; constraint C3In (1),
Figure BDA0003125324930000045
and,
Figure BDA0003125324930000046
Respectively representing wind power equivalent machine regulation delta Q, the voltage upper limit value and the voltage lower limit value of the central busgThe back center bus voltage is within the upper and lower limit ranges; for constraint condition C4，Qg、
Figure BDA0003125324930000047
Respectively representing the current idle work, idle work upper limit and idle work lower limit of the wind power equivalent machine and the adjustment delta Q of the wind power equivalent machinegThe reactive power of the rear wind power equivalent machine is within the upper and lower limit ranges;
(2-2) adopting Guo Qing Lai and SunAnd (2) solving a quadratic programming problem solving method introduced in the research on the secondary voltage control coordination (power system automation, 2005, 29 (23): 19-23) of the document, such as Hongbining, Zenming and the like, and solving a quadratic programming model with normal voltage of a high-voltage side bus of the offshore booster station in the step (2-1) to obtain reactive power regulating quantity delta Q of equivalent generators (including wind power equivalent machines and SVG) in each wind farmg；
(2-3) reactive power regulating quantity delta Q according to the step (2-2)gCalculating the voltage regulating quantity delta V of the high-voltage side bus of the onshore switchyard of each offshore wind farm in the region by using the following formulaH：
ΔVH＝ChgΔQg (3)
Wherein, ChgFor the voltage sensitivity matrix of wind field equivalent unit regulating quantity in the offshore wind power collection area to the onshore switch station bus of each wind field, the voltage regulating quantity delta V is usedHCurrent voltage value V superimposed to the control busHrealObtaining a set value V of the control bus voltageHset；
Vhset＝VHreal+ΔVH
Will VHsetThe reactive power regulation method comprises the following steps of issuing the reactive power regulation method to all offshore wind farm AVC substations in an area, and completing reactive power regulation in the wind farms by the AVC substations;
(3) current voltage V of high-voltage side bus of offshore booster stations' make a judgment if the high-voltage side bus voltage of the offshore booster station of a part of offshore wind field in the region has exceeded the limit, that is
Figure BDA0003125324930000051
Or
Figure BDA0003125324930000052
And taking the high-voltage side bus voltage safety and the central bus voltage optimization of the offshore booster station as composite targets, and executing the following calculation steps on the offshore wind power collection area:
(3-1) establishing a quadratic programming model of the out-of-limit of the high-voltage side bus voltage of the offshore booster station:
Figure BDA0003125324930000053
formula (4) is an objective function of the quadratic programming model of the offshore booster station high-voltage side bus voltage out-of-limit, and the constraint condition set of the quadratic programming model of the offshore booster station high-voltage side bus voltage out-of-limit is the same as that of formula (2), wherein
Figure BDA0003125324930000054
The voltage correction value is represented, and the calculation method is as follows:
Figure BDA0003125324930000055
wherein the content of the first and second substances,
Figure BDA0003125324930000056
and
Figure BDA0003125324930000057
represents the lower and upper voltage limits, delta, of the high-voltage side bus of the offshore booster station of the wind farmSFor the dead zone of voltage correction, 0.5-1.0 kV can be selected for a 220kV bus;
(3-2) calculating voltage regulation instructions of the high-voltage side buses of the onshore switch station of each wind field in the region by using the methods in the step (2-2) and the step (2-3), sending the voltage regulation instructions to AVC substations of each offshore wind farm in the region, finishing reactive power regulation in the wind field by each AVC substation,
(4) and (4) returning to the step (1) to continue to process the next offshore wind power collection area until all the offshore wind power collection areas are processed, and realizing the secondary voltage control of the power grid of the offshore wind power collection area.
The invention will now be described in detail with reference to 2 specific examples, which are provided herein for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Example 1:
the embodiment is to a 220kV offshore wind power collection district, including 1 220kV transformer substation, 2 wind-powered electricity generation field land switch stations and 1 offshore booster station, as shown in fig. 2, pearl bay switch station has 1 SVG, and pearl bay booster station has 4 equivalence generators, and it has 2 SVG to melt star switch station.
The method of the embodiment comprises the following steps: generally, the control period of the offshore wind power collection area is set to be 1 minute, the data acquisition period is set to be 30 seconds in the embodiment, and the control period is set to be 1 minute.
1. When the control period comes, the voltage V of the high-voltage side bus of the offshore booster station of each wind farm in each offshore wind power collection area is checkedSWherein, the voltage V of the 220kV #1 bus of the pearl bay booster station of the offshore booster stationS，VS＝237.35kV；
2. Pearl bay booster station 220kV #1 bus voltage lower limit
Figure BDA0003125324930000061
Upper limit of voltage
Figure BDA0003125324930000062
Figure BDA0003125324930000063
Not meet the requirements of
Figure BDA0003125324930000064
Entering a step 3:
2-1, establishing a secondary planning model for the pearl bay booster station 220kV #1 bus voltage to be normal
Figure BDA0003125324930000065
Figure BDA0003125324930000066
2-2, solving the quadratic programming problem to obtain the reactive power regulating quantity delta Q of each wind fieldg。
2-3, further calculating:
ΔVH＝ChgΔQg (3)
the voltage regulating quantity of the high-voltage side bus of the onshore switch station of each offshore wind farm in the region can be calculated and superposed
Current voltage value V to busHrealThe above step (1);
VHset＝VHreal+ΔVH
will VHsetAnd the reactive power is transmitted to all the AVC substations of the offshore wind power station in the region, and all the AVC substations complete reactive power regulation in the wind power station.
3. The pearl bay booster station 220kV #1 bus is already beyond the upper limit, namely
Figure BDA0003125324930000067
The offshore wind power collection area executes the following steps:
3-1, establishing a secondary planning model of the voltage out-of-limit of a 220kV #1 bus of the pearl bay booster station:
Figure BDA0003125324930000068
the constraint is consistent with equation (2). Wherein Vp＝231.51kV，
Figure BDA0003125324930000069
At the moment, the 220kV #1 bus of the pearl bay booster station is beyond the upper limit, the voltage needs to be regulated downwards, and the optimization target of the central bus needs to be regulated upwards. In order to ensure the voltage safety of the booster station, W is arranged at the momentpAnd (5) preferentially ensuring the voltage safety of the booster station when the voltage is 0. V'S＝237.35kV，
Figure BDA00031253249300000610
Figure BDA00031253249300000611
Represents the booster station bus voltage correction value, namely:
Figure BDA0003125324930000071
wherein deltaSFor the dead zone of the voltage correction, this example takes δS0kV, i.e
Figure BDA0003125324930000072
3-2, repeating the steps 2-2 and 2-3, and solving to obtain:
Figure BDA0003125324930000073
VHset＝VHreal+ΔVH＝236.89-1.45＝235.44kV
and calculating voltage regulation instructions of the high-voltage side buses of the onshore switch stations of the wind farms in the region, issuing the voltage regulation instructions to AVC substations of the offshore wind farms in the region, and finishing reactive power regulation in the wind farms by the AVC substations.
4. And returning to the step 1 to continuously process the next offshore wind power collection area until all the offshore wind power collection areas are processed.
Example 2:
this example is illustrated in accordance with example 1.
The method of the embodiment comprises the following steps: generally, the control period of the offshore wind power collection area is set to be 1 minute, the data acquisition period is set to be 30 seconds in the embodiment, and the control period is set to be 1 minute.
1. When the control period comes, the voltage V of the high-voltage side bus of the offshore booster station of each wind farm in each offshore wind power collection area is checkedSWherein, the voltage V of the 220kV #1 bus of the pearl bay booster station of the offshore booster stationS，VS＝232.23kV；
2. Pearl bay booster station 220kV #1 bus voltage lower limit
Figure BDA0003125324930000074
Upper limit of voltage
Figure BDA0003125324930000075
Figure BDA0003125324930000076
Satisfy the requirement of
Figure BDA0003125324930000077
The method comprises the following steps:
2-1, establishing a secondary planning model for the pearl bay booster station 220kV #1 bus voltage to be normal
Figure BDA0003125324930000078
Figure BDA0003125324930000079
Wherein, Wp＝1，Vp＝232.48，
Figure BDA0003125324930000081
2-2, solving the quadratic programming problem to obtain the reactive power regulating quantity delta Q of each wind fieldg，
Figure BDA0003125324930000082
2-3, further calculating:
ΔVH＝CvgΔQg (3)
the voltage regulation quantity of the onshore switch station bus of the wind field can be calculated;
Figure BDA0003125324930000083
the voltage regulating quantity of the high-voltage side bus of the onshore switch station of each offshore wind farm in the region can be calculated and superposed to the current voltage value V of the busHrealThe above step (1);
VHset＝VHreal+ΔVH＝233.22+0.1＝233.23kV
will VHsetAnd the reactive power is transmitted to all the AVC substations of the offshore wind power station in the region, and all the AVC substations complete reactive power regulation in the wind power station.
3. The bus of the pearl bay booster station 220kV #1 is normal, and the step 4 is carried out
4. And returning to the step 1 to continuously process the next offshore wind power collection area until all the offshore wind power collection areas are processed.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.

Claims (2)

1. A power grid secondary voltage control method facing an offshore wind power collection area is characterized in that a secondary planning model with normal voltage of a high-voltage side bus of an offshore booster station, CSVC for short, is established, the voltage of the high-voltage side bus of the offshore booster station in the offshore wind power collection area is checked, and if the voltage of the high-voltage side bus of the offshore booster station is normal, a constraint condition of the high-voltage side bus of the offshore booster station of a wind field is added into the CSVC model so as to ensure that a solving model meets the requirement of voltage operation of the offshore part of the wind field; if the voltage of the high-voltage side bus of the offshore booster station is out of limit, a part for correcting the voltage of the bus of the offshore booster station is added in an objective function of the CSVC model, the out-of-limit voltage of the offshore part is eliminated by solving the model, and the voltage control requirements of the offshore and onshore buses in normal operation are met.
2. The method for controlling the secondary voltage of the power grid according to claim 1, wherein the specific process of the method comprises the following steps:
(1) when controlling the periodWhen coming, the voltage V of the high-voltage side bus of the offshore booster station of each wind farm in the offshore wind power collection area in the power grid is checkedS；
(2) For the voltage V of the high-voltage side bus of the offshore booster station in the step (1)SJudging if the high-voltage side bus voltage V of the booster stationSIn the normal range, i.e. satisfies
Figure FDA0003125324920000011
Wherein
Figure FDA0003125324920000012
And
Figure FDA0003125324920000013
respectively, the lower voltage limit and the upper voltage limit of a marine booster station high-voltage side bus of a marine wind field, and then the following calculation steps are executed on the marine wind power collection area by taking the 220kV bus voltage optimization of the wind power collection station in the marine wind power collection area as a target, taking a high-voltage side bus of a onshore switch station as a control bus, and taking the voltage of the marine booster station high-voltage side bus as a constraint condition:
(2-1) establishing a quadratic programming model with normal high-voltage side bus voltage of the offshore booster station:
Figure FDA0003125324920000014
Figure FDA0003125324920000015
the formula (1) is an objective function of a quadratic programming model, and the minimum variation delta Q of a wind power equivalent machine is calculated by taking the optimization of the central bus voltage as a targetgParameter thetagFor the target part of the balance of reactive power output of each wind field in the offshore wind power collection area, Wp、WqRespectively a voltage control target weight coefficient and a reactive power source balance control target weight coefficient, VpAnd
Figure FDA0003125324920000016
current voltage and voltage regulation target value of the central bus respectively, CpgA sensitivity matrix of wind field equivalent unit reactive power regulating quantity to a central bus voltage in an offshore wind power collection area;
formula (2) is a set of constraints for formula (1), for constraint C0In, ChgFor the voltage sensitivity matrix of the wind field equivalent unit regulating quantity to the onshore switch station bus of each wind field in the offshore wind power collection area,
Figure FDA0003125324920000021
for controlling the single step maximum adjustment quantity of the bus, the adjustment delta Q of the wind power equivalent machine is representedgThe voltage variation of control bus should not be greater than
Figure FDA0003125324920000022
Constraint C1In, VH、
Figure FDA0003125324920000023
And
Figure FDA0003125324920000024
respectively representing the current voltage, the upper voltage limit value and the lower voltage limit value of the control bus and the adjustment delta Q of the wind power equivalent machinegThe voltage of the rear control bus is within the range of the upper limit and the lower limit; constraint C2In, CsgRepresenting wind power equivalent machine adjustment delta Q for the wind farm equivalent set adjustment quantity in the offshore wind power collection area to the bus voltage sensitivity matrix of each wind farm offshore booster stationgThe voltage of a high-voltage side bus of the rear booster station is within the upper and lower limit ranges; constraint C3In (1),
Figure FDA0003125324920000025
and,
Figure FDA0003125324920000026
Respectively representing wind power equivalent machine regulation delta Q, the voltage upper limit value and the voltage lower limit value of the central busgThe back center bus voltage is within the upper and lower limit ranges; for constraint condition C4，Qg、
Figure FDA0003125324920000027
Respectively representing the current idle work, idle work upper limit and idle work lower limit of the wind power equivalent machine and the adjustment delta Q of the wind power equivalent machinegThe reactive power of the rear wind power equivalent machine is within the upper and lower limit ranges;
(2-2) solving the quadratic programming model of the marine booster station with normal high-voltage side bus voltage in the step (2-1) to obtain the reactive power regulating quantity delta Q of the equivalent generator in each wind fieldg；
(2-3) reactive power regulating quantity delta Q according to the step (2-2)gCalculating the voltage regulating quantity delta V of the high-voltage side bus of the onshore switchyard of each offshore wind farm in the region by using the following formulaH：
ΔVH＝ChgΔQg (3)
Wherein, ChgFor the voltage sensitivity matrix of wind field equivalent unit regulating quantity in the offshore wind power collection area to the onshore switch station bus of each wind field, the voltage regulating quantity delta V is usedHCurrent voltage value V superimposed to the control busHrealObtaining a set value V of the control bus voltageHset；
VHset＝VHreal+ΔVH
Will VHsetThe reactive power regulation method comprises the following steps of issuing the reactive power regulation method to all offshore wind farm AVC substations in an area, and completing reactive power regulation in the wind farms by the AVC substations;
(3) current voltage V of high-voltage side bus of offshore booster stations' make a judgment if the high-voltage side bus voltage of the offshore booster station of a part of offshore wind field in the region has exceeded the limit, that is
Figure FDA0003125324920000028
Or
Figure FDA0003125324920000029
And taking the high-voltage side bus voltage safety and the central bus voltage optimization of the offshore booster station as composite targets, and executing the following calculation steps on the offshore wind power collection area:
(3-1) establishing a quadratic programming model of the out-of-limit of the high-voltage side bus voltage of the offshore booster station:
Figure FDA0003125324920000031
formula (4) is an objective function of the quadratic programming model of the offshore booster station high-voltage side bus voltage out-of-limit, and the constraint condition set of the quadratic programming model of the offshore booster station high-voltage side bus voltage out-of-limit is the same as that of formula (2), wherein
Figure FDA0003125324920000032
The voltage correction value is represented, and the calculation method is as follows:
Figure FDA0003125324920000033
wherein the content of the first and second substances,
Figure FDA0003125324920000034
and
Figure FDA0003125324920000035
represents the lower and upper voltage limits, delta, of the high-voltage side bus of the offshore booster station of the wind farmsFor the dead zone of voltage correction, 0.5-1.0 kV can be selected for a 220kV bus;
(3-2) calculating voltage regulation instructions of the high-voltage side buses of the onshore switch station of each wind field in the region by using the methods in the step (2-2) and the step (2-3), sending the voltage regulation instructions to AVC substations of each offshore wind farm in the region, finishing reactive power regulation in the wind field by each AVC substation,
(4) and (4) returning to the step (1) to continue to process the next offshore wind power collection area until all the offshore wind power collection areas are processed, and realizing the secondary voltage control of the power grid of the offshore wind power collection area.
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