CN116131343A - Time sequence control protection method, storage medium and equipment for doubly-fed fan set - Google Patents

Time sequence control protection method, storage medium and equipment for doubly-fed fan set Download PDF

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CN116131343A
CN116131343A CN202310161547.9A CN202310161547A CN116131343A CN 116131343 A CN116131343 A CN 116131343A CN 202310161547 A CN202310161547 A CN 202310161547A CN 116131343 A CN116131343 A CN 116131343A
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doubly
fan
voltage
reactive power
fed wind
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莫菲
顾文
季洁
梅睿
汪泓
喻建
姚瑶
杨春
张瑶
闫涛
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Jiangsu Fangtian Power Technology Co Ltd
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Jiangsu Fangtian Power 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
    • H02J3/38—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
    • H02J3/04—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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given 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
    • H02J3/38—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
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed 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
    • 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
    • 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

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Abstract

The invention discloses a time sequence control protection method, a storage medium and equipment for a double-fed fan set, wherein the time sequence control protection method for the double-fed fan set comprises the following steps: under the condition that the doubly-fed wind turbine set is in a steady-state operation mode, calculating a reactive power sensitivity matrix of the doubly-fed wind power plant through a disturbance method based on a Newton-Lapherson tide calculation equation; determining a fault type according to whether a feeder line protection signal in the doubly-fed wind power plant is received or not, and setting an outlet end voltage reference value of the doubly-fed wind power plant according to the fault type; based on the method, more wind turbines are kept in grid connection through a doubly-fed wind turbine group time sequence control protection strategy of reactive power-voltage mixed factors, the off-grid rate of fans in a large wind field when voltage drops is reduced, and the stability of the wind field is effectively improved.

Description

Time sequence control protection method, storage medium and equipment for doubly-fed fan set
Technical Field
The invention relates to the technical field of operation and data analysis, in particular to a time sequence control protection method, a storage medium and equipment for a doubly-fed fan set.
Background
The disturbance rejection capability of large power plants is indispensible from the stability and reliability of the power system. At present, most wind power plants indirectly inhibit the overcurrent at the rotor side by accelerating the decay speed of a stator flux linkage so as to improve the low voltage ride through capability of a fan, and the problem is that the doubly fed fan has smaller converter capacity and limits the improvement of the low voltage ride through capability of the doubly fed fan, so that the low voltage ride through technology of the doubly fed fan becomes a great difficulty in the current research.
The invention is based on a doubly-fed wind field, and provides a multi-section coordination time sequence control strategy for maintaining as many wind turbines as possible to be connected with a power grid in different fault occurrence conditions.
Disclosure of Invention
In view of the above, the invention provides a time sequence control protection method, a storage medium and equipment for a doubly-fed wind power plant, which improve the grid-connected rate of the doubly-fed wind power plant when the doubly-fed wind power plant experiences voltage drop faults and meet the requirement of stability in a power system.
In order to achieve the technical purpose, the invention adopts the following technical scheme: a time sequence control protection method of a double-fed fan set specifically comprises the following steps:
step 1, under the condition that a doubly-fed wind turbine set is in a steady-state operation mode, calculating a reactive power sensitivity matrix of the doubly-fed wind power plant through a disturbance method based on a Newton-Lapherson power flow calculation equation; the reactive power sensitivity matrix of the doubly-fed wind power plant consists of a reactive power sensitivity coefficient of the outlet end of the fan in a normal running state and a reactive power sensitivity coefficient of the outlet end of the fan after the crowbar protection action;
step 2, determining a fault type according to whether a feeder line protection signal in the doubly-fed wind power plant is received or not, and setting a voltage reference value of an outlet end of the doubly-fed wind power plant according to the fault type;
step 3, judging whether the voltage of each fan end in the doubly-fed wind power plant is greater than a set doubly-fed wind power plant outlet end voltage reference value, and if so, normally connecting the grid; otherwise, resetting the reference reactive power value output by the rotor side of the normal doubly-fed wind turbine set by calculating the defined reactive power increment coefficient and combining the reactive power sensitivity coefficient of the outlet end of the wind turbine in the normal working state, and if the voltage of each wind turbine end after resetting is larger than the set voltage reference value of the outlet end of the doubly-fed wind power plant, normally connecting the grid; otherwise, executing the step 4;
step 4, calculating the shedding quantity of the fans after the crowbar protection action according to the reactive power sensitivity coefficient of the outlet end of the fans after the crowbar protection action, and shedding fans working in an asynchronous state according to the shedding quantity, if the updated voltage of each fan end which is not in the rest and is not in the off-grid state is greater than a set voltage reference value of the outlet end of the doubly-fed wind power plant, normally connecting the fans; otherwise, executing the step 5;
and 5, calculating a voltage priority index of the remaining fans which are not disconnected, and sequentially disconnecting the fans from high to low according to the voltage priority index until the lifting voltage of each remaining fan end is smaller than or equal to a set voltage reference value of the outlet end of the doubly-fed wind power plant.
Further, the step 1 specifically includes the following sub-steps:
step 101, a newton-Laportson tide calculation equation is as follows:
Figure BDA0004094351840000021
wherein DeltaP is a micro-increment column vector of active power injected by the fan port, deltaQ is a micro-increment column vector of reactive power injected by the fan port, deltaθ is a variable column vector of voltage phase angle of the fan port, deltaV is a variable column vector of voltage amplitude of the fan port,
Figure BDA0004094351840000022
is a jacobian matrix of a system tide equation under polar coordinates, J Pθ Is->
Figure BDA0004094351840000023
Subarrays, J PV Is->
Figure BDA0004094351840000024
Subarrays, J Qθ Is->
Figure BDA0004094351840000025
Subarrays, J QV Is->
Figure BDA0004094351840000026
Subarray;
102, under the condition that a doubly-fed wind power plant is in a steady-state operation mode, a disturbance is given to the doubly-fed wind power plant, and a micro-increment column vector delta Q of reactive power injected into a fan port, a fan port voltage amplitude change column vector delta V and a fan port voltage phase angle change column vector delta theta are measured;
step 103, let Δp=0, and calculate a reactive power sensitivity matrix S of the doubly-fed wind farm according to the newton-raphson power flow calculation equation, where:
Figure BDA0004094351840000027
the reactive power sensitivity matrix of the doubly-fed wind power plant is composed of a reactive power sensitivity coefficient of the outlet end of the fan in a normal running state and a reactive power sensitivity coefficient of the outlet end of the fan after crowbar protection action.
Further, in step 2, if a feeder line protection signal inside the doubly-fed wind power plant is received, a fault occurs outside the doubly-fed wind power plant, and a voltage reference value V at an outlet end of the doubly-fed wind power plant is set out-ref 0.9p.u.; otherwise, the fault occurs in the doubly-fed wind power plant and is delayed according to the total delay time t of the fault out.ref Obtaining a voltage reference value V of an outlet end of the doubly-fed wind power plant out-ref The method comprises the following steps:
Figure BDA0004094351840000028
wherein t is set Overcurrent protection delay delta t for line feeder with fault inside doubly-fed wind power plant set For the direct time difference of feeder protection and breaker fault protection, Δt is the margin reserved for breaker action.
Further, step 3 comprises the following sub-steps:
step 301, judging whether the voltage of each fan end in the doubly-fed wind power plant is greater than a set doubly-fed wind power plant outlet end voltage reference value, and if so, normally connecting the grid; otherwise, go to step 302;
step 302, calculating a value range of the reactive power increment coefficient, giving the circulation times s of the reactive power increment coefficient, and setting the step length delta M of the reactive power increment coefficient according to the maximum value, the minimum value and the circulation times of the reactive power increment coefficient;
step 303, for each fan in the doubly-fed wind power plant, calculating the minimum value M of the reactive power increment coefficient min Initially, calculating a reactive power reference value Q of each fan nref.j Setting the voltage V 'of each fan end' i，j ；
Step 304, judging and resetting the voltage V 'of each fan end' i，j Whether or not it is greater than a set wind power plant outletThe voltage reference value of the port end, if yes, normally connecting to the grid; otherwise, updating the reactive power increment coefficient according to the step length delta M of the reactive power increment coefficient, repeating the step 303 until the reset reactive power increment coefficient is equal to the maximum value of the reactive power increment coefficient, and executing the step 4;
setting the voltage V 'of each fan end' i，j The calculation process of (1) is as follows:
Figure BDA0004094351840000031
Q nref.j ＝M n Q max.j n＝1,2,3，...，s；
wherein V is i.j For the voltage of the outlet end of the jth fan on the ith line when the fault occurs, M n Is the increment coefficient of reactive power in the nth cycle, M n ＝M min +(n-1)ΔM，S ij The reactive power sensitivity coefficient of the outlet end of the jth fan on the ith line is Q nref.j Is the reactive power reference value, Q of the jth doubly-fed fan during the nth cycle max.j Is the difference between the maximum reactive power output by the j-th doubly-fed fan and the real-time output reactive power, omega D Is a set of fans in all normal running states.
Further, in step 302, the calculation process of the reactive power increment coefficient M is:
Figure BDA0004094351840000032
wherein V is out-ref Is the reference value of the port voltage of the doubly-fed wind power plant, V p The port voltage of the maximum doubly-fed wind power plant which is used for maintaining the grid connection of the fan in the low-voltage ride-through requirement;
the Δm is calculated by:
Figure BDA0004094351840000033
wherein M is max Is reactive powerMaximum value of the power increment coefficient.
Further, in the step 4, the calculation process of the shedding number J of the fans after the crowbar protection action is as follows:
Figure BDA0004094351840000034
wherein V is out-ref Is a doubly-fed wind power plant port voltage reference value, V' i，j The outlet end voltage re-set for the jth fan on the ith line, S ik Is the reactive power sensitivity coefficient, omega of the outlet end of the fan after the protection action of the kth crowbar on the ith line A For fan set after all crowbar protection actions, Q k The reactive power absorbed by the fan after the protection action of the kth crowbar is V p The method comprises the steps of maintaining the maximum wind farm port voltage of the fan grid connection in the low voltage ride through requirement;
according to the value range of the falling number J of the fans after the crowbar protection action, taking an integer m according to the sequence from small to large, and updating the voltage V of each fan end i.j ”：
Figure BDA0004094351840000041
Wherein J is min For the minimum shedding number of the fans after the crowbar protection action, J max The maximum falling number of the fans after the crowbar protection action is set.
Further, the calculating process of the voltage priority index P in step 5 is as follows:
Figure BDA0004094351840000042
wherein V is out-ref Is a doubly-fed wind power plant port voltage reference value, M max Is the maximum value of the increment coefficient of reactive power, S ij Is the reactive power sensitivity coefficient of the outlet end of the jth fan on the ith line, S ik After the protection action of the kth pry bar on the ith lineReactive power sensitivity coefficient, Q of outlet end of fan max.j Is the difference between the maximum reactive power which can be output by the j-th doubly-fed wind turbine and the real-time output reactive power, Q k The reactive power absorbed by the fan after the protection action of the kth pry bar is calculated, J is the falling number of the fan after the protection action of the pry bar, and ψ is calculated k To work in the state of the kth fan under the protection action state of the crowbar, ψ k =1 is fan off-grid, ψ k The =0 fans are still grid connected.
Further, in step 5, the voltage V 'after the rising of each fan end is remained' i，j The method comprises the following steps:
Figure BDA0004094351840000043
wherein V is i.j "updating voltage for the J-th fan end on the i-th line remained after the sequential disconnection from high to low according to the voltage priority index", N is the total number of fans after the crowbar protection action, N-J is the number of fans remained after the step 4, t is the number of fans remained after the sequential disconnection from high to low according to the voltage priority index, ψ t To get the state of the t-th fan, ψ, left after the sequential disconnection from the grid according to the voltage priority index from high to low t =1 is the t-th fan remaining after the sequential de-networking from high to low according to the voltage priority index, ψ t And the number of t-th fans remained after the sequential grid removal from high to low according to the voltage priority index is shown as the number of the times of the grid connection of the t-th fans.
Further, the present invention provides a computer-readable storage medium storing a computer program for causing a computer to execute the double-fed fan set timing control protection method.
Further, the present invention also provides an electronic device, including: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the time sequence control protection method of the double-fed fan set when executing the computer program.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a time sequence control protection method of a double-fed fan set, which comprehensively classifies double-fed fans in a double-fed wind field into two main types of normal operation fans and crowbar protection action fans according to whether a crowbar circuit acts when faults occur according to the working characteristics of the double-fed fans, and provides a time sequence control protection strategy of the double-fed fan set based on reactive power-voltage mixing factors on the basis of the two main types of the normal operation fans and the crowbar protection action fans, wherein the time sequence control protection strategy of the double-fed fan set respectively regulates reference reactive power values output by a fan rotor side working in a normal state by resetting and does not lead to the immediate disconnection of the double-fed fans; calculating the shedding quantity of fans after the crowbar protection action through the reactive power sensitivity coefficient of the outlet end of the fans after the crowbar protection action, and improving the port voltage of other fans by a method of cutting off a certain quantity of doubly-fed fans after the crowbar protection action so as to reduce the grid-connected rate of the doubly-fed fans after faults occur; finally, gradually raising the voltage of the fan end according to a method of sequentially removing the grid from high to low according to the voltage priority index so as to meet the grid-connected requirement; compared with the traditional direct off-grid mode, the time sequence control protection strategy is smoother, and the fan grid-connection stability of the doubly-fed wind power plant is effectively improved.
Drawings
FIG. 1 is a general flow chart of a method for protecting timing control of a doubly-fed wind turbine generator system according to the present invention;
FIG. 2 is a low voltage ride through request diagram;
FIG. 3 is a flow chart of step 2 of the present invention;
fig. 4 is a flow chart of step 3 in the present invention.
Detailed Description
The technical scheme of the invention is further explained below with reference to the accompanying drawings.
Fig. 1 is a general flow chart of a time sequence control protection method of a double-fed fan set, which specifically includes the following steps:
step 1, under the condition that a doubly-fed wind turbine set is in a steady state operation mode, calculating a reactive power sensitivity matrix of the doubly-fed wind turbine set by a disturbance method based on a Newton-Lapherson trend calculation equation, wherein the reactive power sensitivity matrix establishes the relation between terminal voltages and reactive powers of all fans in the wind turbine set, lays a foundation for quantitative analysis in a follow-up three-step control protection strategy of the invention, and is beneficial to quantifying physical quantities in each control strategy, such as: the reactive power increment coefficient in the step 3 is in a value range, the fans in the step 4 are in a network-off number range, and the voltage priority index in the step 5 are in a voltage priority index, so that the voltage of the fan terminal is smoothly and gradually raised. The reactive power sensitivity matrix of the doubly-fed wind power plant is composed of a reactive power sensitivity coefficient of the outlet end of the fan in a normal running state and a reactive power sensitivity coefficient of the outlet end of the fan after crowbar protection action; the method specifically comprises the following substeps:
step 101, a newton-Laportson tide calculation equation is as follows:
Figure BDA0004094351840000051
wherein DeltaP is a micro-increment column vector of active power injected by the fan port, deltaQ is a micro-increment column vector of reactive power injected by the fan port, deltaθ is a variable column vector of voltage phase angle of the fan port, deltaV is a variable column vector of voltage amplitude of the fan port,
Figure BDA0004094351840000061
is a jacobian matrix of a system tide equation under polar coordinates, J Pθ Is->
Figure BDA0004094351840000062
Subarrays, J PV Is->
Figure BDA0004094351840000063
Subarrays, J Qθ Is->
Figure BDA0004094351840000064
Subarrays, J QV Is->
Figure BDA0004094351840000065
Subarray;
102, under the condition that a doubly-fed wind power plant is in a steady-state operation mode, a disturbance is given to the doubly-fed wind power plant, and a micro-increment column vector delta Q of reactive power injected into a fan port, a fan port voltage amplitude change column vector delta V and a fan port voltage phase angle change column vector delta theta are measured;
step 103, let Δp=0, and calculate a reactive power sensitivity matrix S of the doubly-fed wind farm according to the newton-raphson power flow calculation equation, where:
Figure BDA0004094351840000066
the reactive power sensitivity matrix of the doubly-fed wind power plant is composed of a reactive power sensitivity coefficient of the outlet end of the fan in a normal running state and a reactive power sensitivity coefficient of the outlet end of the fan after crowbar protection action.
Step 2, determining a fault type according to whether a feeder line protection signal in the doubly-fed wind power plant is received or not, setting a voltage reference value of an outlet end of the doubly-fed wind power plant according to the fault type, wherein a low voltage crossing standard requires that the doubly-fed wind power plant has certain low voltage crossing capability, and a judging standard is that the outlet end voltage of the doubly-fed wind power plant, and the wind power plant fault can be divided into the internal fault of the doubly-fed wind power plant and the external fault of the doubly-fed wind power plant, wherein the external fault is far away from the outlet end of the doubly-fed wind power plant, and generally does not cause voltage dip of the outlet end of the doubly-fed wind power plant, and the outlet end voltage of the doubly-fed wind power plant can be set to be the steady-state minimum outlet end voltage capable of meeting grid connection of the doubly-fed wind power plant according to the low voltage crossing requirement; the internal fault point is very close to the outlet of the doubly-fed wind power plant, which can lead to voltage dip at the outlet of the doubly-fed wind power plant, and in order to prevent the false off-grid, the voltage at the outlet of the doubly-fed wind power plant is set by specifically considering the total fault delay time when relay protection occurs on the internal circuit so as to ensure the low voltage ride through capability of the wind power plant; specifically, if a feeder line protection signal inside the doubly-fed wind power plant is received, a fault occurs outside the doubly-fed wind power plant, and a voltage reference value V of an outlet end of the doubly-fed wind power plant is set out-ref 0.9p.u.; otherwise, the fault occurs in the doubly-fed wind power plant and is delayed according to the total delay time t of the fault out.ref Obtaining a voltage reference value V of an outlet end of the doubly-fed wind power plant out-ref The method comprises the following steps:
Figure BDA0004094351840000067
wherein t is set The overcurrent protection delay of the line feeder line which is in fault in the doubly-fed wind power plant is usually 0.4s; Δt (delta t) set For the direct time difference of feeder protection and breaker failure protection, Δt is the margin reserved for breaker action, typically set to 0.1s.
Step 3, judging whether the voltage of each fan end in the doubly-fed wind power plant is greater than a set doubly-fed wind power plant outlet end voltage reference value, and if so, normally connecting the grid; otherwise, resetting the reference reactive power value output by the rotor side of the normal doubly-fed wind turbine set by calculating the defined reactive power increment coefficient and combining the reactive power sensitivity coefficient of the outlet end of the wind turbine in the normal working state, and if the voltage of each wind turbine end after resetting is larger than the set voltage reference value of the outlet end of the doubly-fed wind power plant, normally connecting the grid; otherwise, executing the step 4; by means of the control protection strategy, on the premise that all the doubly-fed fans are kept connected in a grid mode, as the reference reactive power value output by the doubly-fed fan rotor side working in the rated state is not the maximum reference reactive power reference value capable of working stably, the voltage of the doubly-fed fan end is improved by means of improving the reactive power reference value output by the doubly-fed fan rotor side working in the normal state, and the doubly-fed fan cannot be immediately disconnected by modifying the reactive power reference value output by the doubly-fed fan rotor side working in the normal state. As shown in fig. 3, the method specifically comprises the following substeps:
step 301, judging whether the voltage of each fan end in the doubly-fed wind power plant is greater than a set doubly-fed wind power plant outlet end voltage reference value, and if so, normally connecting the grid; otherwise, go to step 302;
step 302, calculating a value range of the reactive power increment coefficient, giving the circulation times s of the reactive power increment coefficient, and setting the step length delta M of the reactive power increment coefficient according to the maximum value, the minimum value and the circulation times of the reactive power increment coefficient;
the calculation process of the reactive power increment coefficient M in the invention is as follows:
Figure BDA0004094351840000071
wherein V is out-ref Is the reference value of the port voltage of the doubly-fed wind power plant, V p The port voltage of the maximum doubly-fed wind power plant which is used for maintaining the grid connection of the fan in the low-voltage ride-through requirement;
the calculation process of the delta M in the invention is as follows:
Figure BDA0004094351840000072
wherein M is max Is the maximum value of the reactive power increment coefficient;
step 303, for each fan in the doubly-fed wind power plant, calculating the minimum value M of the reactive power increment coefficient min Initially, calculating a reactive power reference value Q of each fan nref.j Setting the voltage V 'of each fan end' i，j ；
Step 304, judging and resetting the voltage V 'of each fan end' i，j Whether the voltage reference value is larger than a set voltage reference value of an outlet end of the wind power plant or not, if so, normally connecting the grid; otherwise, updating the reactive power increment coefficient according to the step length delta M of the reactive power increment coefficient, repeating the step 303 until the reset reactive power increment coefficient is equal to the maximum value of the reactive power increment coefficient, and executing the step 4;
in the invention, the voltage V 'of each fan end is set again' i，j The calculation process of (1) is as follows:
Figure BDA0004094351840000073
Q nref.j ＝M n Q max.j n＝1,2,3，...，s；
wherein V is i.j For the voltage of the outlet end of the jth fan on the ith line when the fault occurs, M n Is the nthReactive power increment coefficient at cycle, M n ＝M min +(n-1)ΔM，S ij The reactive power sensitivity coefficient of the outlet end of the jth fan on the ith line is Q nref.j Is the reactive power reference value, Q of the jth doubly-fed fan during the nth cycle max.j Is the difference between the maximum reactive power output by the j-th doubly-fed fan and the real-time output reactive power, omega D Is a set of fans in all normal running states.
Step 4, as shown in fig. 4, calculating the shedding quantity of the fans after the crowbar protection action according to the reactive power sensitivity coefficient of the outlet end of the fans after the crowbar protection action, and shedding the fans working in an asynchronous state according to the shedding quantity, if the updated voltage of each fan end which is not in the rest of the grid is greater than the set voltage reference value of the outlet end of the doubly-fed wind power plant, normally connecting the grid; otherwise, executing the step 5; the control protection strategy in the step is that the doubly-fed fans after the crowbar protection action can not provide reactive power by themselves, the reactive power is required to be absorbed from the power grid to ensure that the doubly-fed fans continue to run in a grid-connected mode, and the phenomenon of absorbing the reactive power from the power grid can lead to further reduction of the voltage of the fan ends, so that the voltage of other fan ends can be increased by a method of cutting off a certain number of doubly-fed fans after the crowbar protection action, and the grid-connected rate of the doubly-fed fans after faults occur is reduced.
The calculation process of the shedding number J of the fans after the crowbar protection action is as follows:
Figure BDA0004094351840000081
wherein V is out-ref Is a doubly-fed wind power plant port voltage reference value, V' i，j The outlet end voltage re-set for the jth fan on the ith line, S ik Is the reactive power sensitivity coefficient, omega of the outlet end of the fan after the protection action of the kth crowbar on the ith line A For fan set after all crowbar protection actions, Q k The reactive power absorbed by the fan after the protection action of the kth crowbar is V p Maximum wind farm port for maintaining fan grid connection in low voltage ride through requirementsA voltage;
in order to ensure that as many doubly-fed wind turbines as possible are kept in a grid-connected state, the voltage V at each fan end needs to be updated within the calculated value range of the shedding number J of the fans after the crowbar protection action, and according to the value range of the shedding number J of the fans after the crowbar protection action, integers m are taken in order from small to large i.j ”：
Figure BDA0004094351840000082
Wherein J is min For the minimum shedding number of the fans after the crowbar protection action, J max The maximum falling number of the fans after the crowbar protection action is set.
And 5, calculating a voltage priority index of the remaining fans which are not disconnected, and sequentially disconnecting the fans from high to low according to the voltage priority index until the lifting voltage of each remaining fan end is smaller than or equal to a set voltage reference value of the outlet end of the doubly-fed wind power plant. For the doubly-fed fans of the same type, the more the port voltage is increased through the first two-step strategy, the smaller the influence on the wind power plant after the grid removal is, so that the voltage priority index P is provided to better reflect the difference between the voltage reference value of the fan end and the port voltage increased through the first two-step strategy, and the grid removal is sequentially carried out from high to low according to the voltage priority index, so that the influence on the grid removal of the fans is minimized.
The calculation process of the voltage priority index P in the invention is as follows:
Figure BDA0004094351840000091
wherein V is out.ref Is a doubly-fed wind power plant port voltage reference value, M max Is the maximum value of the increment coefficient of reactive power, S ij Is the reactive power sensitivity coefficient of the outlet end of the jth fan on the ith line, S ik The reactive power sensitivity coefficient of the outlet end of the fan after the protection action of the kth crowbar on the ith line is Q max.j Is the j-th doubly-fed wind turbine capable of outputtingDifference between large reactive power and real-time output reactive power, Q k The reactive power absorbed by the fan after the protection action of the kth pry bar is calculated, J is the falling number of the fan after the protection action of the pry bar, and ψ is calculated k To work in the state of the kth fan under the protection action state of the crowbar, ψ k =1 is fan off-grid, ψ k The =0 fans are still grid connected.
The voltage V 'after the lifting of each fan end is remained in the invention' i，j The method comprises the following steps:
Figure BDA0004094351840000092
wherein V is i.j "updating voltage for the J-th fan end on the i-th line remained after the sequential disconnection from high to low according to the voltage priority index", N is the total number of fans after the crowbar protection action, N-J is the number of fans remained after the step 4, t is the number of fans remained after the sequential disconnection from high to low according to the voltage priority index, ψ t To get the state of the t-th fan, ψ, left after the sequential disconnection from the grid according to the voltage priority index from high to low t =1 is the t-th fan remaining after the sequential de-networking from high to low according to the voltage priority index, ψ t And the number of t-th fans remained after the sequential grid removal from high to low according to the voltage priority index is shown as the number of the times of the grid connection of the t-th fans.
According to the time sequence control protection method of the doubly-fed wind turbine group, the doubly-fed wind turbines in the doubly-fed wind farm are divided into two main types of normal operation fans and crowbar protection action fans according to the action of a crowbar circuit when faults occur comprehensively according to the working characteristics of the doubly-fed wind turbines, a time sequence control protection strategy of the doubly-fed wind turbine group based on reactive power-voltage mixing factors is provided on the basis of the two main types of the doubly-fed wind turbines, more wind turbines can be kept connected in a grid, the off-grid rate of the fans in the large wind farm when the voltage drops is reduced, and the stability of the wind farm is effectively improved.
In one aspect of the present invention, there is also provided a computer-readable storage medium storing a computer program for causing a computer to execute the timing control protection method of a doubly-fed fan set.
In another aspect of the present invention, there is also provided an electronic device, including: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the time sequence control protection method of the double-fed fan set when executing the computer program.
In the embodiments disclosed herein, a computer storage medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The computer storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a computer storage medium would include one or more wire-based electrical connections, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, and all technical solutions belonging to the concept of the present invention are within the scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.

Claims (10)

1. The time sequence control protection method of the double-fed fan set is characterized by comprising the following steps of:
step 1, under the condition that a doubly-fed wind turbine set is in a steady-state operation mode, calculating a reactive power sensitivity matrix of the doubly-fed wind power plant through a disturbance method based on a Newton-Lapherson power flow calculation equation; the reactive power sensitivity matrix of the doubly-fed wind power plant consists of a reactive power sensitivity coefficient of the outlet end of the fan in a normal running state and a reactive power sensitivity coefficient of the outlet end of the fan after the crowbar protection action;
step 2, determining a fault type according to whether a feeder line protection signal in the doubly-fed wind power plant is received or not, and setting a voltage reference value of an outlet end of the doubly-fed wind power plant according to the fault type;
step 3, judging whether the voltage of each fan end in the doubly-fed wind power plant is greater than a set doubly-fed wind power plant outlet end voltage reference value, and if so, normally connecting the grid; otherwise, resetting the reference reactive power value output by the rotor side of the normal doubly-fed wind turbine set by calculating the defined reactive power increment coefficient and combining the reactive power sensitivity coefficient of the outlet end of the wind turbine in the normal working state, and if the voltage of each wind turbine end after resetting is larger than the set voltage reference value of the outlet end of the doubly-fed wind power plant, normally connecting the grid; otherwise, executing the step 4;
step 4, calculating the shedding quantity of the fans after the crowbar protection action according to the reactive power sensitivity coefficient of the outlet end of the fans after the crowbar protection action, and shedding fans working in an asynchronous state according to the shedding quantity, if the updated voltage of each fan end which is not in the rest and is not in the off-grid state is greater than a set voltage reference value of the outlet end of the doubly-fed wind power plant, normally connecting the fans; otherwise, executing the step 5;
and 5, calculating a voltage priority index of the remaining fans which are not disconnected, and sequentially disconnecting the fans from high to low according to the voltage priority index until the lifting voltage of each remaining fan end is smaller than or equal to a set voltage reference value of the outlet end of the doubly-fed wind power plant.
2. The method for protecting timing control of a doubly-fed wind turbine generator system according to claim 1, wherein the step 1 specifically comprises the following sub-steps:
step 101, a newton-Laportson tide calculation equation is as follows:
Figure FDA0004094351830000011
wherein DeltaP is a micro-increment column vector of active power injected by the fan port, deltaQ is a micro-increment column vector of reactive power injected by the fan port, deltaθ is a variable column vector of voltage phase angle of the fan port, deltaV is a variable column vector of voltage amplitude of the fan port,
Figure FDA0004094351830000012
is a jacobian matrix of a system tide equation under polar coordinates, J Pθ Is->
Figure FDA0004094351830000013
Subarrays, J PV Is->
Figure FDA0004094351830000014
Subarrays, J Qθ Is->
Figure FDA0004094351830000015
Subarrays, J QV Is->
Figure FDA0004094351830000016
Subarray;
102, under the condition that a doubly-fed wind power plant is in a steady-state operation mode, a disturbance is given to the doubly-fed wind power plant, and a micro-increment column vector delta Q of reactive power injected into a fan port, a fan port voltage amplitude change column vector delta V and a fan port voltage phase angle change column vector delta theta are measured;
step 103, let Δp=0, and calculate a reactive power sensitivity matrix S of the doubly-fed wind farm according to the newton-raphson power flow calculation equation, where:
Figure FDA0004094351830000021
the reactive power sensitivity matrix of the doubly-fed wind power plant is composed of a reactive power sensitivity coefficient of the outlet end of the fan in a normal running state and a reactive power sensitivity coefficient of the outlet end of the fan after crowbar protection action.
3. The timing control protection method of a doubly-fed wind turbine generator system according to claim 1, wherein in step 2, if a feeder line protection signal inside the doubly-fed wind power plant is received, a fault occurs outside the doubly-fed wind power plant, and a voltage reference value V at an outlet end of the doubly-fed wind power plant is set out-ref 0.9p.u.; otherwise, the fault occurs in the doubly-fed wind power plant and is delayed according to the total delay time t of the fault out.ref Obtaining a voltage reference value V of an outlet end of the doubly-fed wind power plant out-ref The method comprises the following steps:
Figure FDA0004094351830000022
wherein t is set Overcurrent protection delay delta t for line feeder with fault inside doubly-fed wind power plant set For the direct time difference of feeder protection and breaker fault protection, Δt is the margin reserved for breaker action.
4. The method for protecting timing control of a doubly-fed wind turbine generator system according to claim 1, wherein the step 3 comprises the following sub-steps:
step 301, judging whether the voltage of each fan end in the doubly-fed wind power plant is greater than a set doubly-fed wind power plant outlet end voltage reference value, and if so, normally connecting the grid; otherwise, go to step 302;
step 302, calculating a value range of the reactive power increment coefficient, giving the circulation times s of the reactive power increment coefficient, and setting the step length delta M of the reactive power increment coefficient according to the maximum value, the minimum value and the circulation times of the reactive power increment coefficient;
step 303, for each fan in the doubly-fed wind power plant, calculating the minimum value M of the reactive power increment coefficient min Initially, calculating a reactive power reference value Q of each fan nref.j Setting the voltage V 'of each fan end' i，j ；
Step 304, judging and resetting the voltage V 'of each fan end' i，j Whether the voltage reference value is larger than a set voltage reference value of an outlet end of the wind power plant or not, if so, normally connecting the grid; otherwise, updating the reactive power increment coefficient according to the step length delta M of the reactive power increment coefficient, repeating the step 303 until the reset reactive power increment coefficient is equal to the maximum value of the reactive power increment coefficient, and executing the step 4;
setting the voltage V 'of each fan end' i，j The calculation process of (1) is as follows:
Figure FDA0004094351830000023
Q nref.j ＝M n Q max.j n＝1,2,3，...，s；
wherein V is i.j For the voltage of the outlet end of the jth fan on the ith line when the fault occurs, M n Is the increment coefficient of reactive power in the nth cycle, M n ＝M min +(n-1)ΔM，S ij The reactive power sensitivity coefficient of the outlet end of the jth fan on the ith line is Q nref.j Is the reactive power reference value, Q of the jth doubly-fed fan during the nth cycle max.j Is the difference between the maximum reactive power output by the j-th doubly-fed fan and the real-time output reactive power, omega D Is a set of fans in all normal running states.
5. The method for protecting timing control of a doubly-fed wind turbine generator system according to claim 4, wherein the calculating process of the reactive power increment coefficient M in step 302 is as follows:
Figure FDA0004094351830000031
wherein V is out-ref Is the reference value of the port voltage of the doubly-fed wind power plant, V p The port voltage of the maximum doubly-fed wind power plant which is used for maintaining the grid connection of the fan in the low-voltage ride-through requirement;
the Δm is calculated by:
Figure FDA0004094351830000032
wherein M is max Is the maximum value of the reactive power increment coefficient.
6. The time sequence control protection method of a doubly-fed wind turbine generator system according to claim 1, wherein the calculating process of the shedding number J of the wind turbines after the crowbar protection action in the step 4 is as follows:
Figure FDA0004094351830000033
wherein V is out-ref Is a doubly-fed wind power plant port voltage reference value, V' i，j The outlet end voltage re-set for the jth fan on the ith line, S ik Is the reactive power sensitivity coefficient, omega of the outlet end of the fan after the protection action of the kth crowbar on the ith line A For fan set after all crowbar protection actions, Q k The reactive power absorbed by the fan after the protection action of the kth crowbar is V p The method comprises the steps of maintaining the maximum wind farm port voltage of the fan grid connection in the low voltage ride through requirement;
according to the value range of the falling number J of the fans after the crowbar protection action, taking an integer m according to the sequence from small to large, and updating the voltage V of each fan end i.j ”：
Figure FDA0004094351830000034
Wherein J is min For the minimum shedding number of the fans after the crowbar protection action, J max The maximum falling number of the fans after the crowbar protection action is set.
7. The method for protecting timing control of a doubly-fed wind turbine generator system according to claim 1, wherein the calculating process of the voltage priority index P in step 5 is as follows:
Figure FDA0004094351830000041
wherein V is out-ref Is a doubly-fed wind power plant port voltage reference value, M max Is the maximum value of the increment coefficient of reactive power, S ij Is the reactive power sensitivity coefficient of the outlet end of the jth fan on the ith line, S ik The reactive power sensitivity coefficient of the outlet end of the fan after the protection action of the kth crowbar on the ith line is Q max.j Is the difference between the maximum reactive power which can be output by the j-th doubly-fed wind turbine and the real-time output reactive power, Q k The reactive power absorbed by the fan after the protection action of the kth pry bar is calculated, J is the falling number of the fan after the protection action of the pry bar, and ψ is calculated k To work in the state of the kth fan under the protection action state of the crowbar, ψ k =1 is fan off-grid, ψ k The =0 fans are still grid connected.
8. The method of claim 7, wherein the "remaining" in step 5'
Voltage V after lifting of each fan end i，j The method comprises the following steps:
Figure FDA0004094351830000042
wherein V is i.j "the voltage is updated according to the voltage priority index from high to low on the jth fan end of the ith line remained after the successive disconnection, N is the total number of fans after the crowbar protection action, N-J is the total number of fans after the step 4The number of remaining fans, t is the number of remaining fans after the sequential grid removal from high to low according to the voltage priority index, ψ t To get the state of the t-th fan, ψ, left after the sequential disconnection from the grid according to the voltage priority index from high to low t =1 is the t-th fan remaining after the sequential de-networking from high to low according to the voltage priority index, ψ t And the number of t-th fans remained after the sequential grid removal from high to low according to the voltage priority index is shown as the number of the times of the grid connection of the t-th fans.
9. A computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the double-fed fan set timing control protection method according to any one of claims 1 to 8.
10. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the doubly fed fan set timing control protection method according to any one of claims 1-8 when executing the computer program.
CN202310161547.9A 2023-02-23 2023-02-23 Time sequence control protection method, storage medium and equipment for doubly-fed fan set Pending CN116131343A (en)

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