CN111756061B - Static security domain control method and system considering new energy power grid faults and prediction - Google Patents

Static security domain control method and system considering new energy power grid faults and prediction Download PDF

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CN111756061B
CN111756061B CN202010424382.6A CN202010424382A CN111756061B CN 111756061 B CN111756061 B CN 111756061B CN 202010424382 A CN202010424382 A CN 202010424382A CN 111756061 B CN111756061 B CN 111756061B
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expected
ith node
fault
deviation amount
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CN111756061A (en
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陈建华
陈天华
摆世彬
于晓军
田蓓
赵欣洋
李峰
戴则梅
闪鑫
王毅
杜磊
徐陆飞
熊正勇
焦龙
吴鹏
邹洪森
徐辉
王永刚
闭耀中
许大卫
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Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
State Grid Ningxia Electric Power Co Ltd
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NARI Nanjing Control System Co Ltd
State Grid Ningxia Electric Power 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
    • G—PHYSICS
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    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q10/0635—Risk analysis of enterprise or organisation activities
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    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q50/06—Electricity, gas or water supply
    • 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
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

The invention discloses a static security domain control method and a static security domain control system considering new energy grid faults and prediction in the technical field of power system operation, and aims to solve the technical problem that new energy is in linkage off-line due to voltage drop of a grid new energy grid connection point caused by the faults and fluctuation of a new energy sending end grid. The method comprises the following steps: acquiring an expected voltage offset; constructing a voltage static state security domain of the regional new energy based on the expected voltage offset and a preset voltage limit value; constructing a regional voltage control model based on the voltage static security domain; and implementing reactive voltage control on the new energy power grid based on the regional voltage control model.

Description

Static security domain control method and system considering new energy power grid faults and prediction
Technical Field
The invention relates to a static security domain control method and system considering new energy power grid faults and prediction, and belongs to the technical field of power system operation.
Background
With the large-scale grid connection of new energy mainly comprising wind power and photovoltaic of a sending-end power grid and the large-scale power transmission of direct current, the safe operation of the power grid is greatly challenged by the blocking fault of a direct current circuit and the random fluctuation of the new energy. The voltage drop of the grid connection point of the new energy of the power grid caused by single random fault further causes the chain off-grid accident of the new energy, and the new energy chain off-grid accident occurs at home and abroad.
The traditional deterministic safety analysis concept is proposed by DyLiacco, which examines the disturbance bearing capacity of a power system for a set of expected accidents, wherein the set of expected accidents comprises disturbances which can occur at the next moment and have serious consequences, and each disturbance condition in the set of expected accidents is subjected to static safety analysis by using a power flow equation. The traditional static safety analysis method comprises a direct current load flow method, a fault sequencing method and other calculation methods.
The load flow calculation is a basic electrical calculation for studying the steady-state operation of an electric power system, and the task of the conventional load flow calculation is to determine the operation state of the whole system, such as the voltage (amplitude and phase angle) on each bus, the power distribution in the network, and the power loss, etc., according to given operation conditions and network structures. The result of the load flow calculation is the basis of the stability calculation and the fault analysis of the power system, is the most widely, basically and most important electric operation applied in the power system, and adopts the off-line load flow calculation when the system plans and designs and arranges the operation mode of the system; in the real-time monitoring of the running state of the power system, on-line load flow calculation is adopted. There are many methods for calculating power flows, such as the gauss-seidel method, the newton-raphson method, the P-Q decomposition method, the direct current power flow method, and various power flow calculation methods evolved from the gauss-seidel method and the newton-raphson method. The partition voltage control carries out control decision based on partitions, the reactive power regulation means in each partition are coordinately controlled, the secondary voltage control is expanded on the basis of the traditional CSVC control strategy, and the coordination control among continuous discrete mixed regulation means such as unit reactive power output, capacitor/reactor switching and the like is uniformly considered.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a static security domain control method and a system considering new energy power grid faults and prediction so as to solve the technical problem that the new energy cascading off-line is caused by the voltage drop of a new energy grid connection point due to the faults and fluctuation of a new energy sending end power grid.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a static security domain control method considering new energy power grid faults and prediction comprises the following steps:
acquiring an expected voltage offset;
constructing a voltage static state security domain of the regional new energy based on the expected voltage offset and a preset voltage limit value;
and constructing a regional voltage control model based on the voltage static security domain.
Further, the method for obtaining the expected voltage offset includes:
calculating the fault expected voltage deviation amount of the ith node based on traditional expected fault analysis, wherein the fault expected voltage deviation amount comprises a fault expected voltage positive deviation amount and a fault expected voltage negative deviation amount;
based on the traditional ultra-short term load prediction and the new energy prediction, calculating the predicted expected voltage deviation amount of the ith node in the next period;
and calculating the expected voltage offset of the ith node based on the expected voltage deviation amount of the fault and the predicted expected voltage deviation amount, wherein the expected voltage offset comprises an expected voltage positive deviation amount and an expected voltage negative deviation amount.
Further, the expected voltage deviation amount of the fault is calculated by the following formula:
Figure BDA0002498126000000021
in the formula,. DELTA.Vi caExpected voltage deviation, Δ V, for the fault of the ith nodei ca+Positive deviation of expected voltage for fault of i-th node, Δ Vi ca-Expected negative deviation of voltage for fault of i-th node, Vi bCalculating the ground state voltage of the ith node for the current section load flow before the fault; j is 1,2,3 …, m is an N-1 expected failure in which the voltage after failure is higher than the ground state voltage, k is 1,2,3 …, N is an N-1 expected failure in which the voltage after failure is lower than the ground state voltage,
Figure BDA0002498126000000022
and
Figure BDA0002498126000000023
are all the voltage after the fault of the ith node.
Further, the predicted expected voltage deviation amount is calculated according to the following formula:
ΔVi fo＝Vi fo-Vi b；
in the formula,. DELTA.Vi foPredicted expected voltage deviation amount, V, for ith node of next cyclei foPredicted voltage, V, for the ith node of the next cyclei bAnd calculating the ground state voltage of the ith node for the current section load flow.
Further, the expected voltage offset includes an expected voltage positive deviation amount and an expected voltage negative deviation amount, and the expected voltage offset is calculated by the following formula:
Figure BDA0002498126000000031
in the formula,. DELTA.ViIs the expected voltage deviation, Δ V, of the ith nodei +Is the expected positive voltage deviation, Δ V, of the ith nodei -Is the expected negative deviation of voltage at the ith node, Δ Vi ca+Positive deviation of expected voltage for fault of i-th node, Δ Vi ca-Is the ith sectionExpected voltage negative deviation, Δ V, of point of failurei foThe predicted expected voltage deviation amount for the ith node of the next cycle.
Further, the voltage limit includes a lower voltage setting limit and an upper voltage setting limit, and the voltage quiescent state safety domain is calculated as follows:
Figure BDA0002498126000000032
in the formula, omegaiIs the voltage static security domain of the ith node, ViIs the present voltage of the ith node bus,V ia lower limit is set for the voltage of the ith node bus,
Figure BDA0002498126000000033
setting an upper limit, Δ V, for the voltage of the ith node busi +Is the expected positive voltage deviation, Δ V, of the ith nodei -And epsilon is the expected negative voltage deviation amount of the ith node, and epsilon is a voltage limit deviation threshold value.
Further, the method for constructing the regional voltage control model comprises the following steps:
the voltage static state security domain is used as a voltage safety operation interval meeting the power grid anticipated fault and predicted voltage change constraint, real-time acquired power grid operation information, voltage sensitivity of a regional reactive power source to a regional bus and a voltage target of a regional central bus are substituted, the traditional extended secondary voltage control model is modified and deformed, and the modified regional voltage control model has the following calculation formula:
Figure BDA0002498126000000034
in the formula, VpIs the current voltage of the central bus in the area,
Figure BDA0002498126000000035
is a voltage target of a central bus in the region, ViIs the present voltage of the ith node bus,V ia lower limit is set for the voltage of the ith node bus,
Figure BDA0002498126000000036
setting an upper limit for the voltage of the ith node bus, epsilon being a voltage limit deviation threshold, DeltaVi +Is the expected positive voltage deviation, Δ V, of the ith nodei -Is the expected negative deviation of the voltage at the ith node;
Figure BDA0002498126000000041
for the voltage sensitivity of the in-zone unit reactive to the zone bus,
Figure BDA0002498126000000042
voltage sensitivity of reactive power of the regional reactors to regional buses is set;
Figure BDA0002498126000000043
for the voltage sensitivity of the in-zone unit reactive to the ith bus,
Figure BDA0002498126000000044
the voltage sensitivity of reactive power of the regional reactor to the ith bus is set; qgIs the current idle power of the units in the region,
Figure BDA0002498126000000045
is the upper limit of the reactive power of the units in the region,Q gthe reactive lower limit of the unit in the region; qcFor the current reactive power of the reactors within the zone,
Figure BDA0002498126000000046
is the upper reactive limit of the reactors in the area,Q cthe reactive lower limit of the reactors in the region; delta QgReactive power regulation, delta Q, of units in a zonecReactive adjustment amount of reactive reactor in the area.
Further, control is implemented to the new forms of energy electric wire netting based on regional voltage control model, includes:
solving the regional voltage control model to obtain a new energy control instruction;
and controlling the new energy power grid based on the new energy control command.
In order to achieve the above object, the present invention further provides a static security domain control system considering new energy grid faults and predictions, including:
the expected voltage offset acquisition module: obtaining a desired voltage offset;
a voltage static security domain construction module: the voltage static state safety domain is used for constructing a regional new energy source based on the expected voltage offset and a preset voltage limit value;
the area voltage control correction module: the method is used for constructing the regional voltage control model based on the voltage static security domain.
Further, the expected voltage offset acquisition module comprises:
the expected voltage deviation amount of the fault calculation submodule: the fault prediction method comprises the steps of obtaining a fault prediction voltage deviation amount of an ith node based on traditional prediction fault analysis, wherein the fault prediction voltage deviation amount comprises a fault prediction voltage positive deviation amount and a fault prediction voltage negative deviation amount;
the predicted expected voltage deviation amount calculation submodule: the method is used for solving the predicted expected voltage deviation amount of the ith node in the next period based on the traditional ultra-short-term load prediction and the new energy prediction;
the expected voltage offset calculation submodule: and the controller is used for solving an expected voltage offset of the ith node based on the fault expected voltage deviation amount and the predicted expected voltage deviation amount, wherein the expected voltage offset comprises an expected voltage positive deviation amount and an expected voltage negative deviation amount.
Compared with the prior art, the invention has the following beneficial effects: the method is based on the traditional automatic voltage control technology, aims at the reactive voltage operation characteristic of the random fluctuation of the new energy, comprehensively considers the influence of the large disturbance of the power grid and the operation situation of the power grid on the voltage, firstly obtains the expected voltage offset, then constructs the voltage static security domain of the regional new energy based on the expected voltage offset and the preset voltage limit value, calculates and corrects the static security domain of the regional bus voltage, reduces the potential safety operation hazard of the power grid caused by the fault and the fluctuation of the new energy, reduces the risk of the new energy collecting chain off-grid, and improves the voltage safe operation level. The system disclosed by the invention is designed based on a mature application module, can achieve a good convergence effect, can be used for practically analyzing and calculating the safety of a power grid and controlling reactive voltage in real time, and provides a good technical support effect for the safe grid connection of new energy.
Drawings
FIG. 1 is a schematic flow diagram of an embodiment of the method of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The specific embodiment of the present invention provides a static security domain control method considering new energy grid faults and predictions, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention, and includes the following steps:
step (1), acquiring real-time tide states of bus voltage, line active power, line reactive power and the like of a new energy regional power grid through real-time data, and acquiring a voltage target of a regional central bus through three-level voltage control in real time
Figure BDA0002498126000000051
With ViRepresenting the current voltage of the i-th node bus of the power grid in VpExpressed as the present voltage of the in-zone neutral bus, in QgRepresenting the current reactive power of the unit, by QcRepresenting the current reactive power output of the capacitive reactance;
step (2), the voltage sensitivity of various reactive power sources such as a unit (or an equivalent unit) in the region and a reactor to a regional bus is obtained according to sensitivity analysis so as to
Figure BDA0002498126000000052
Respectively representing the voltage-reactive sensitivity of the unit and the capacitive reactance device in the region to the ith bus;
and (3) calculating an expected voltage deviation amount according to the traditional expected fault analysis, ultra-short-term load prediction and ultra-short-term new energy prediction, wherein the specific method for realizing the step comprises the following steps:
calculating the expected voltage deviation amount delta V of the fault of the ith node based on the traditional expected fault analysisi ca：
Figure BDA0002498126000000053
Wherein j is 1,2,3 …, and m is an expected N-1 fault in which the voltage after the fault is higher than the ground state voltage; k is 1,2,3 …, N is an N-1 predicted fault with the voltage after the fault lower than the ground state voltage; vi bCalculating the ground state voltage of the ith node for the current section load flow before the fault;
Figure BDA0002498126000000054
and
Figure BDA0002498126000000055
the voltage is the voltage after the fault of the ith node, the former is higher than the ground state voltage, and the latter is lower than the ground state voltage; Δ Vi ca+And Δ Vi ca-Respectively representing the positive deviation amount and the negative deviation amount of the fault expected voltage of the ith node, and knowing Δ Vi ca+Not less than 0 and Δ Vi ca-≦ 0, Δ V when there is a j failurei ca+> 0, otherwise,. DELTA.Vi ca+0; similarly, Δ V when there is a k faulti ca-< 0, otherwise,. DELTA.Vi ca-＝0。
Secondly, calculating the predicted expected voltage deviation amount delta V of the ith node in the next period (5-15 min predicted section) based on the traditional ultra-short term load prediction and the new energy predictioni fo：
ΔVi fo＝Vi fo-Vi b (2)
In the formula, Vi bCalculating the ith node for the current section load flowThe ground state voltage of (1); vi foThe predicted voltage of the ith node in the next cycle. Will conform to the prediction Vi foThe calculation of (2) can be obtained by substituting the load change of the predicted node into the power flow equation.
And thirdly, calculating the expected voltage deviation amount due to the grid fault and prediction:
Figure BDA0002498126000000061
in the formula,. DELTA.Vi +And Δ Vi -Respectively representing the expected positive deviation amount and the expected negative deviation amount of the voltage of the ith node, knowing Δ Vi +Not less than 0 and Δ Vi -≤0。
Step (4), constructing a regional new energy voltage static security domain according to the expected voltage deviation amount and the set voltage limit value; the static voltage security domain is a voltage safety operation interval which meets the power grid anticipated fault and prediction voltage change constraint, and the specific method for realizing the step comprises the following steps:
Figure BDA0002498126000000062
in the formula, Vi、V i、
Figure BDA0002498126000000063
Respectively setting a lower limit and an upper limit for the current voltage, the voltage setting lower limit and the voltage setting upper limit of an ith node bus of the power grid; epsilon is a voltage limit value deviation threshold value which is a small positive real number, the magnitude of epsilon is artificially set according to operation experience, and the magnitude is used for preventing voltage fluctuation or voltage out-of-limit caused by over-regulation; Δ Vi +And Δ Vi -The expected voltage positive deviation amount and the expected voltage negative deviation amount respectively representing the ith node can be obtained according to equation (3).
Step (5), comprehensively considering the steps (1), (2) and (4) to construct a regional voltage control model, solving, modifying and deforming according to the traditional extended secondary voltage control model, and changing the voltage safety constraint interval of the regional bus node, wherein the specific method for realizing the step comprises the following steps:
Figure BDA0002498126000000064
in the formula, Vp、
Figure BDA0002498126000000071
The current voltage and the optimized voltage target value of the central bus in the region are obtained;
Figure BDA0002498126000000072
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the central bus is high; delta Qg、ΔQcReactive adjustment quantity is provided for the unit and the capacitive reactance device; vi、
Figure BDA0002498126000000073
AndV irespectively obtaining the current value, the upper limit and the lower limit of the voltage of the ith node bus in the region;
Figure BDA0002498126000000074
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the ith bus is determined; qg、
Figure BDA0002498126000000075
AndQ grespectively setting the current reactive power, the upper reactive power limit and the lower reactive power limit of the unit in the region; qc、
Figure BDA0002498126000000076
AndQ crespectively including the current reactive power, the upper reactive power limit and the lower reactive power limit of the reactor in the area, wherein epsilon is a voltage limit deviation threshold and is a small positive real number; Δ Vi +And Δ Vi -The expected voltage positive deviation amount and the expected voltage negative deviation amount respectively representing the ith node bus can be obtained according to the formula (3).
Step (6), solving and calculating a new energy control command according to the step (5), and issuing a command to the new energy;
and (7) waiting for the next execution cycle to arrive, and returning to the step (1).
The method aims to properly constrain the current voltage by considering the fault of a power grid at a transmitting end and the prediction of a future section, so that the voltage of a junction bus can meet the constraint of one period (5-15 minutes) after the fault and in the future, the voltage safety is improved, and the risk of new energy off-line is reduced. The method has the advantages that the power grid stability and the new energy randomness are prevented and controlled through expected fault analysis, ultra-short-term load and new energy prediction, the voltage static state safety domains of the central bus and the control bus of the new energy power plant in the power grid region are calculated, control constraint bases are provided for automatic voltage control, the influence of the power grid on power grid faults and random fluctuation is improved, and the risk of chain off-grid of new energy is reduced.
The specific implementation manner of the present invention further provides a static security domain control system considering new energy grid faults and predictions, which is used for implementing the method of the present invention, and the method includes:
the power grid operation information acquisition module: the method is used for acquiring the operation information of the power grid, the voltage sensitivity of a regional reactive power source to a regional bus and the voltage target of a regional central bus in real time, namely the technical contents recorded in the steps (1) and (2) in the embodiment of the method.
The expected voltage offset acquisition module: for obtaining the expected voltage offset, which is the technical content recorded in step (3) of the foregoing embodiment of the method of the invention, more specifically, the module includes:
the expected voltage deviation amount of the fault calculation submodule: the fault prediction method comprises the steps of obtaining a fault prediction voltage deviation amount of an ith node based on traditional prediction fault analysis, wherein the fault prediction voltage deviation amount comprises a fault prediction voltage positive deviation amount and a fault prediction voltage negative deviation amount;
the predicted expected voltage deviation amount calculation submodule: the method is used for solving the predicted expected voltage deviation amount of the ith node in the next period based on the traditional ultra-short-term load prediction and the new energy prediction;
the expected voltage offset calculation submodule: and the controller is used for solving an expected voltage offset of the ith node based on the fault expected voltage deviation amount and the predicted expected voltage deviation amount, wherein the expected voltage offset comprises an expected voltage positive deviation amount and an expected voltage negative deviation amount.
A voltage static security domain construction module: and (3) constructing a voltage static security domain of the regional new energy source based on the expected voltage offset and the preset voltage limit value, namely the technical content recorded in the step (4) in the embodiment of the invention method.
The area voltage control correction module: the method is used for constructing a regional voltage control model based on the voltage static security domain, namely the technical content recorded in step (5) in the embodiment of the invention method.
The new energy power grid implementation control module comprises: the method is used for controlling the new energy power grid based on the regional voltage control model, namely the technical content recorded in the step (6) in the embodiment of the invention method.
The method is based on the traditional automatic voltage control technology, aims at the reactive voltage operation characteristic of the random fluctuation of the new energy, comprehensively considers the influence of the large disturbance of the power grid and the operation situation of the power grid on the voltage, firstly obtains the expected voltage offset, then constructs the voltage static security domain of the regional new energy based on the expected voltage offset and the preset voltage limit value, calculates and corrects the static security domain of the regional bus voltage, reduces the potential safety operation hazard of the power grid caused by the fault and the fluctuation of the new energy, reduces the risk of the new energy collecting chain off-grid, and improves the voltage safe operation level. The system disclosed by the invention is designed based on a mature application module, can achieve a good convergence effect, can be used for practically analyzing and calculating the safety of a power grid and controlling reactive voltage in real time, and provides a good technical support effect for the safe grid connection of new energy.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (2)

1. A static security domain control method considering new energy power grid faults and prediction is characterized by comprising the following steps:
acquiring an expected voltage offset; the method comprises the following steps:
calculating the fault expected voltage deviation amount of the ith node based on traditional expected fault analysis, wherein the fault expected voltage deviation amount comprises a fault expected voltage positive deviation amount and a fault expected voltage negative deviation amount;
the expected voltage deviation amount of the fault is calculated according to the following formula:
Figure FDA0003362529860000011
in the formula, delta Vi caExpected voltage deviation amount for fault of ith node, delta Vi ca+For the amount of positive deviation of the fault expected voltage of the ith node,. DELTA.Vi ca-Expected negative deviation of voltage for fault of i-th node, Vi bCalculating the ground state voltage of the ith node for the current section load flow before the fault; j is 1,2,3 …, m is an N-1 predicted fault in which the voltage after the fault is higher than the ground state voltage, k is 1,2,3 …, N is an N-1 predicted fault in which the voltage after the fault is lower than the ground state voltage,
Figure FDA0003362529860000012
and
Figure FDA0003362529860000013
all the voltage is the voltage after the i node fails;
based on the traditional ultra-short term load prediction and the new energy prediction, calculating the predicted expected voltage deviation amount of the ith node in the next period;
the predicted expected voltage deviation amount is calculated according to the following formula:
△Vi fo＝Vi fo-Vi b；
in the formula, delta Vi foFor the next cyclePredicted expected voltage deviation, V, for i nodesi foThe predicted voltage of the ith node in the next period;
calculating an expected voltage offset of the ith node based on the expected voltage deviation amount of the fault and the predicted expected voltage deviation amount, wherein the expected voltage offset comprises an expected voltage positive deviation amount and an expected voltage negative deviation amount;
the expected voltage offset is calculated according to the following formula:
Figure FDA0003362529860000014
in the formula, delta ViIs the expected voltage offset, Δ V, of the ith nodei +Is the expected positive voltage deviation, Δ V, of the ith nodei -Is the expected negative deviation of voltage of the ith node, Δ Vi ca+For the amount of positive deviation of the fault expected voltage of the ith node,. DELTA.Vi ca-For the fault expected voltage negative deviation of the ith node,. DELTA.Vi foPredicting an expected voltage deviation amount of an ith node for a next cycle;
constructing a voltage static state security domain of the regional new energy based on the expected voltage offset and a preset voltage limit value;
the voltage limit value comprises a voltage setting lower limit and a voltage setting upper limit, and the voltage static state security domain has the following calculation formula:
Figure FDA0003362529860000021
in the formula, omegaiIs the voltage static security domain of the ith node, ViIs the present voltage of the ith node bus,V ia lower limit is set for the voltage of the ith node bus,
Figure FDA0003362529860000022
setting voltage for ith node busUpper limit,. DELTA.Vi +Is the expected positive voltage deviation, Δ V, of the ith nodei -The expected voltage negative deviation amount of the ith node is shown, and epsilon is a voltage limit value deviation threshold value;
constructing a regional voltage control model based on the voltage static security domain; the method for constructing the regional voltage control model comprises the following steps:
the voltage static state security domain is used as a voltage safety operation interval meeting the power grid anticipated fault and predicted voltage change constraint, real-time acquired power grid operation information, voltage sensitivity of a regional reactive power source to a regional bus and a voltage target of a regional central bus are substituted, the traditional extended secondary voltage control model is modified and deformed, and the modified regional voltage control model has the following calculation formula:
Figure FDA0003362529860000023
in the formula, VpIs the current voltage of the central bus in the area,
Figure FDA0003362529860000024
is a voltage target of a central bus in the region, ViIs the present voltage of the ith node bus,V ia lower limit is set for the voltage of the ith node bus,
Figure FDA0003362529860000025
setting an upper limit for the voltage of the ith node bus, wherein epsilon is a deviation threshold of the voltage limit, and delta Vi +Is the expected positive voltage deviation, Δ V, of the ith nodei -Is the expected negative deviation of the voltage at the ith node;
Figure FDA0003362529860000026
for the voltage sensitivity of the in-zone unit reactive to the zone bus,
Figure FDA0003362529860000027
voltage sensitivity of reactive power of the regional reactors to regional buses is set;
Figure FDA0003362529860000028
for the voltage sensitivity of the in-zone unit reactive to the ith bus,
Figure FDA0003362529860000029
the voltage sensitivity of reactive power of the regional reactor to the ith bus is set; qgIs the current idle power of the units in the region,
Figure FDA0003362529860000031
is the upper limit of the reactive power of the units in the region,Q gthe reactive lower limit of the unit in the region; qcFor the current reactive power of the reactors within the zone,
Figure FDA0003362529860000032
is the upper reactive limit of the reactors in the area,Q cthe reactive lower limit of the reactors in the region; delta QgReactive adjustment of units in a zone, delta QcReactive adjustment quantity of the reactors in the area;
and implementing reactive voltage control on the new energy power grid based on the regional voltage control model.
2. A static security domain control system considering new energy power grid faults and predictions is characterized by comprising:
the expected voltage offset acquisition module: obtaining a desired voltage offset; the method comprises the following steps:
the expected voltage deviation amount of the fault calculation submodule: the fault prediction method comprises the steps of obtaining a fault prediction voltage deviation amount of an ith node based on traditional prediction fault analysis, wherein the fault prediction voltage deviation amount comprises a fault prediction voltage positive deviation amount and a fault prediction voltage negative deviation amount;
the expected voltage deviation amount of the fault is calculated according to the following formula:
Figure FDA0003362529860000033
in the formula, delta Vi caExpected voltage deviation amount for fault of ith node, delta Vi ca+For the amount of positive deviation of the fault expected voltage of the ith node,. DELTA.Vi ca-Expected negative deviation of voltage for fault of i-th node, Vi bCalculating the ground state voltage of the ith node for the current section load flow before the fault; j is 1,2,3 …, m is an N-1 expected failure in which the voltage after failure is higher than the ground state voltage, k is 1,2,3 …, N is an N-1 expected failure in which the voltage after failure is lower than the ground state voltage,
Figure FDA0003362529860000034
and
Figure FDA0003362529860000035
all the voltage is the voltage after the i node fails;
the predicted expected voltage deviation amount calculation submodule: the method is used for solving the predicted expected voltage deviation amount of the ith node in the next period based on the traditional ultra-short-term load prediction and the new energy prediction;
the predicted expected voltage deviation amount is calculated according to the following formula:
△Vi fo＝Vi fo-Vi b；
in the formula, delta Vi foPredicted expected voltage deviation amount, V, for ith node of next cyclei foThe predicted voltage of the ith node in the next period;
the expected voltage offset calculation submodule: the voltage deviation estimation method comprises the steps of calculating an expected voltage deviation amount of an ith node based on a fault expected voltage deviation amount and a predicted expected voltage deviation amount, wherein the expected voltage deviation amount comprises an expected voltage positive deviation amount and an expected voltage negative deviation amount;
the expected voltage offset is calculated according to the following formula:
Figure FDA0003362529860000041
in the formula, delta ViIs the expected voltage offset, Δ V, of the ith nodei +Is the expected positive voltage deviation, Δ V, of the ith nodei -Is the expected negative deviation of voltage of the ith node, Δ Vi ca+For the amount of positive deviation of the fault expected voltage of the ith node,. DELTA.Vi ca-For the fault expected voltage negative deviation of the ith node,. DELTA.Vi foPredicting an expected voltage deviation amount of an ith node for a next cycle;
a voltage static security domain construction module: the voltage static state safety domain is used for constructing a regional new energy source based on the expected voltage offset and a preset voltage limit value; the method comprises the following steps: the voltage limit value comprises a voltage setting lower limit and a voltage setting upper limit, and the voltage static state security domain has the following calculation formula:
Figure FDA0003362529860000042
in the formula, omegaiIs the voltage static security domain of the ith node, ViIs the present voltage of the ith node bus,V ia lower limit is set for the voltage of the ith node bus,
Figure FDA0003362529860000043
setting an upper limit, DeltaV, for the voltage of the ith node busi +Is the expected positive voltage deviation, Δ V, of the ith nodei -The expected voltage negative deviation amount of the ith node is shown, and epsilon is a voltage limit value deviation threshold value;
the area voltage control correction module: the method comprises the steps of constructing a regional voltage control model based on a voltage static security domain; the method comprises the following steps:
the method for constructing the regional voltage control model comprises the following steps:
the voltage static state security domain is used as a voltage safety operation interval meeting the power grid anticipated fault and predicted voltage change constraint, real-time acquired power grid operation information, voltage sensitivity of a regional reactive power source to a regional bus and a voltage target of a regional central bus are substituted, the traditional extended secondary voltage control model is modified and deformed, and the modified regional voltage control model has the following calculation formula:
Figure FDA0003362529860000044
in the formula, VpIs the current voltage of the central bus in the area,
Figure FDA0003362529860000045
is a voltage target of a central bus in the region, ViIs the present voltage of the ith node bus,V ia lower limit is set for the voltage of the ith node bus,
Figure FDA0003362529860000051
setting an upper limit for the voltage of the ith node bus, wherein epsilon is a deviation threshold of the voltage limit, and delta Vi +Is the expected positive voltage deviation, Δ V, of the ith nodei -Is the expected negative deviation of the voltage at the ith node;
Figure FDA0003362529860000052
for the voltage sensitivity of the in-zone unit reactive to the zone bus,
Figure FDA0003362529860000053
voltage sensitivity of reactive power of the regional reactors to regional buses is set;
Figure FDA0003362529860000054
for the voltage sensitivity of the in-zone unit reactive to the ith bus,
Figure FDA0003362529860000055
the voltage sensitivity of reactive power of the regional reactor to the ith bus is set; qgIs the current idle power of the units in the region,
Figure FDA0003362529860000056
is the upper limit of the reactive power of the units in the region,Q gthe reactive lower limit of the unit in the region; qcFor the current reactive power of the reactors within the zone,
Figure FDA0003362529860000057
is the upper reactive limit of the reactors in the area,Q cthe reactive lower limit of the reactors in the region; delta QgReactive adjustment of units in a zone, delta QcReactive adjustment amount of reactive reactor in the area.
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