CN109950929B - Emergency control method and system for coping with low voltage ride through of large-scale new energy unit - Google Patents
Emergency control method and system for coping with low voltage ride through of large-scale new energy unit Download PDFInfo
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- CN109950929B CN109950929B CN201910265292.4A CN201910265292A CN109950929B CN 109950929 B CN109950929 B CN 109950929B CN 201910265292 A CN201910265292 A CN 201910265292A CN 109950929 B CN109950929 B CN 109950929B
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Abstract
The invention discloses an emergency control method and system for coping with low voltage ride through of a large-scale new energy unit, wherein the method comprises the steps of receiving low voltage ride through information; calculating the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid, and accessing the low voltage ride through information substations of the new energy stations with the same influence sensitivity to the low voltage ride through information collecting station of the same new energy region; acquiring monitored bus voltage of a key node of a power grid and key transmission section line power, and acquiring available information of various control resources in the power grid; matching corresponding emergency control measures from a preset control strategy table, and sending the control strategy table to the low-voltage ride-through emergency control substation; and sending an emergency control command to the low voltage ride through emergency control execution station to complete emergency control. The invention effectively reduces the safe and stable operation risk of the large-scale new energy unit entering the low-voltage ride-through state power grid, and is beneficial to improving the safe and stable operation level of the new energy high-ratio power grid.
Description
Technical Field
The invention relates to an emergency control method and an emergency control system for coping with low voltage ride through of a large-scale new energy unit, and belongs to the technical field of electric power systems and automation thereof.
Background
Because the new energy power generation is connected to the power grid through the power electronic equipment interface, the new energy power generation is different from the traditional synchronous generator in nature. If the voltage of the power grid is reduced, in order to protect the safety of the elements of the power grid, the new energy unit enters a low-voltage ride-through stage, and the output of the unit is greatly reduced compared with that under a normal condition. When a large number of new energy source units pass through at low voltage, large-capacity unbalanced power can be caused, the line tide sent by a new energy power generation base is greatly changed, the system voltage fluctuates severely, and the safe and stable operation of a large power grid is threatened. After the system voltage recovers, the output of the new energy unit is gradually recovered after a certain time delay.
Therefore, the fault disturbance form is greatly different from the traditional unbalanced power disturbance in the power grid, firstly, the duration of power reduction of a new energy source unit caused by low voltage ride through is generally short, the power reduction only occurs in a short time of system voltage reduction, the power reduction is different from the power disturbance of direct current blocking, generator tripping and the like for a long time, and once the power reduction is recovered, the system does not have unbalanced power any more; secondly, the fault disturbance mode that the new energy unit enters low penetration is various, the traditional method of triggering stable control by means of alternating current element fault is difficult to completely cover, and the technical economy is poor.
Disclosure of Invention
The invention aims to: the invention provides an emergency control method and system for coping with low voltage ride through of a large-scale new energy unit, which can effectively reduce the safe and stable operation risk of a power grid caused by the fact that the large-scale new energy unit enters the low voltage ride through state and improve the safe and stable characteristics of the high-occupancy-ratio power grid of new energy by using a new energy low voltage ride through signal as an emergency control trigger signal.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention relates to an emergency control method for coping with low voltage ride through of a large-scale new energy unit,
the invention relates to an emergency control method for coping with low voltage ride through of a large-scale new energy unit, which comprises the following steps:
receiving low voltage ride through information sent by a wind turbine generator or a photovoltaic generator;
calculating the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid, and accessing low voltage ride through information substations of the new energy stations with the same influence on the sensitivity to a low voltage ride through information gathering station of the same new energy region;
sending the received low voltage ride through information to an emergency control master station;
acquiring monitored bus voltage of a key node of a power grid and key transmission section line power, and acquiring available information of various control resources in the power grid;
according to the low-voltage ride-through information, the collected bus voltage, the power information of the key transmission section line and the available information of the control resource, matching corresponding emergency control measures from a preset control strategy table, and sending the emergency control measures to a low-voltage ride-through emergency control substation;
and sending an emergency control command to the low voltage ride through emergency control execution station to complete emergency control.
The method for calculating the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid comprises the following steps:
obtaining a typical operation mode of a power grid, and based on a preset initial power P of a new energy station i wi0 And the power of the new energy station is reduced to 10 percent P by low voltage ride through wi0 Calculating to obtain the dominant instability mode M of the system under disturbance i Angle of power stability margin eta δi Voltage stability margin η Vi ；
Initial power P of j based on preset new energy station wj0 The power of the new energy station is reduced to (P) by the low voltage ride through wj0 -0.9P wi0 ) Calculating to obtain the dominant instability mode M of the system under disturbance j Power angle stability margin η δj Voltage stability margin η Vj ；
If M is i ＝M j And | η δi -η δj |≤ε δ And | η Vi -η Vj |≤ε V The new energy field stations i and j are connected to the same new energy region low-voltage ride-through information collecting station, otherwise the new energy field stations i and j are connected to different new energy region low-voltage ride-through information collecting stations, epsilon δ And ε V The power angle stability margin and the voltage stability margin can be borne by different new energy stations with the same influence sensitivity.
The low voltage ride through information comprises a set low voltage ride through signal and the total amount of generated power entering low voltage ride through in the new energy station;
the control resources comprise direct current, a new energy station, a conventional unit and load;
the available information includes dc and emergency available support power, new energy station and emergency available regulated power, conventional generator set and power, load station and power, which can be used for emergency control.
The voltage of the key node bus of the power grid and the power of the key transmission section line are obtained through a wide area monitoring system in the power grid.
The emergency control commands comprise emergency power increasing or reducing, emergency power increasing or reducing of the new energy generating set, cutting of the conventional generating set and cutting of the load.
The control strategy table is formulated according to offline time domain simulation calculation or online time domain simulation calculation, and when the information of the control strategy table comprises different power combinations sent by each new energy region low-voltage ride-through information gathering station, when the monitored bus voltage and the power of a power transmission channel are different values, the direct-current power emergency lifting or speed reduction amount, the new energy unit power emergency lifting or speed reduction amount, the conventional generator unit amount and the load amount are cut off.
The off-line time domain simulation calculation is carried out based on a typical operation mode of a power grid, and a fixed off-line control strategy table is formulated;
the online time domain simulation calculation is to perform rolling calculation according to the real-time operation mode of the power grid and refresh the rolling calculation in real time according to the simulation calculation result to form an online control strategy table;
when the online computing function is not available or the online time domain simulation computing function is unavailable, executing a control strategy by using a control strategy table obtained by offline time domain simulation; and when the online policy table refreshed in real time exists, executing the control policy according to the online policy table.
The invention relates to an emergency control system for coping with low voltage ride through of a large-scale new energy unit, which comprises
The emergency control main station is used for receiving the low-voltage ride-through information sent by the low-voltage ride-through information substation, acquiring the monitored bus voltage of the key node of the power grid and the power of the key transmission section line, and issuing an emergency control command to the corresponding low-voltage ride-through emergency control substation according to a preset control strategy table;
the low-voltage ride-through information substation is used for receiving low-voltage ride-through information sent by the new energy field station and sending the low-voltage ride-through information to the corresponding low-voltage ride-through information gathering station of the new energy region;
the new energy region low-voltage ride-through information collection station is used for receiving low-voltage ride-through information sent by each corresponding low-voltage ride-through information substation and sending a low-voltage ride-through signal and the total amount of generated power entering low-voltage ride-through in the new energy field station to the emergency control main station;
the low-voltage ride-through emergency control sub-station acquires available information of control resources through each low-voltage ride-through emergency control execution station, uploads the available information to the emergency control main station, receives an emergency control command sent by the emergency control main station, and sends the emergency control command to each low-voltage ride-through emergency control execution station;
and the low-voltage ride-through emergency control execution station is used for sending available information of control resources to the corresponding low-voltage ride-through emergency control substation and receiving and executing an emergency control command sent by the low-voltage ride-through emergency control substation.
The low-voltage ride-through emergency control substation comprises a direct-current emergency control substation, a new energy emergency control substation, a cutter emergency control substation, a load-cutting emergency control substation and a low-voltage ride-through emergency control substation.
The low-voltage ride-through emergency control execution station comprises a direct-current emergency control execution station, a new energy emergency control execution station, a generator tripping execution station and a load tripping execution station.
The invention has the following beneficial effects:
after detecting that the low voltage ride through occurs in the large-scale new energy unit, the low voltage ride through information substation sends information to the low voltage ride through information collection station in the new energy region; the new energy region low voltage ride through information collection station sends new energy field station low voltage ride through information with similar influence in the region to the emergency control master station; the emergency control master station acquires the monitored bus voltage of the key node of the power grid and the power of the key transmission section line; the emergency control master station matches corresponding emergency control measures with the control strategy table and sends the control strategy table to the low-voltage ride-through emergency control substation; and the low-voltage ride-through emergency control substation sends an emergency control command to the low-voltage ride-through emergency control execution station to complete emergency control. The method utilizes the new energy low-voltage ride-through information as the trigger signal for the emergency control of the power grid, can effectively reduce the safe and stable operation risk of the large-scale new energy unit when entering a low-voltage ride-through state, and is favorable for improving the safe and stable operation level of the new energy high-ratio power grid.
Drawings
Fig. 1 is a flowchart illustrating an emergency control method for handling low voltage ride through of a large-scale new energy resource unit according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In order to improve the safety and stability characteristics of the power grid after the new energy unit enters low voltage ride through in a large scale, the invention improves the existing stability control system, uses the low voltage ride through signal of the new energy unit as a fault trigger signal, implements the safety and stability control of the power grid, and avoids the damage to the stability of the power grid caused by the low voltage ride through of the large-scale new energy unit.
The invention relates to an emergency control method for coping with low voltage ride through of a large-scale new energy unit, which comprises the following steps:
constructing a low-voltage ride through information substation in the new energy station, and receiving low-voltage ride through information sent by a wind generating set or a photovoltaic generating set: the method comprises the steps of generating a set low-voltage ride through signal and the total amount of generated power entering low-voltage ride through in a new energy station; analyzing the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid, connecting a low voltage ride through information substation of the new energy station with the same influence on the sensitivity to a low voltage ride through information collecting station of the same new energy area, when the new energy unit generates low voltage ride through, sending low voltage ride through information to the corresponding low voltage ride through information collecting station of the new energy area by the low voltage ride through information substation,
all the new energy region low voltage ride through information collecting stations send the received low voltage ride through information to the emergency control master station;
the method comprises the steps that after an emergency control main station receives low-voltage ride-through information, monitored bus voltage of a key node of a power grid and key transmission section line power are obtained, and available information of various control resources in the power grid is obtained through a low-voltage ride-through emergency control substation, the low-voltage ride-through emergency control substation comprises a direct-current emergency control substation, a new energy emergency control substation, a generator tripping emergency control substation and a load shedding emergency control substation, the low-voltage ride-through emergency control substation obtains the available information of the control resources through various control execution stations, and the control execution stations comprise a direct-current emergency control execution station, a new energy emergency control execution station, a generator tripping execution station and a load shedding execution station;
the emergency control master station comprehensively controls the resource available information according to the low-voltage ride-through information and the acquired bus voltage and power transmission section power information, matches a proper emergency control measure from the control strategy table and sends the appropriate emergency control measure to the low-voltage ride-through emergency control substation;
the low-voltage ride-through emergency control substation issues control commands, wherein the control commands comprise direct-current power emergency lifting or rapid descending, new energy unit power emergency lifting or rapid descending, conventional generator unit cutting and load cutting, and emergency control is completed by a direct-current emergency control execution station, a new energy emergency control execution station, a generator cutter execution station and a load cutting execution station respectively.
The sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid is analyzed, and the sensitivity is calculated by the following method:
acquiring a typical operation mode of a power grid, and recording the initial power of a new energy station i as P by using FASTEST electromechanical transient simulation calculation software wi0 When low voltage ride through occurs, the power of the new energy station is reduced to 10 percent P wi0 And obtaining the dominant instability mode M of the system under the disturbance through simulation calculation i Angle of power stability margin eta δi Voltage stability margin η Vi Wherein M is i 、η δi 、η Vi All can be directly simulated by FASTEST software.
For a new energy station j, the initial power is P wj0 When low voltage ride through occurs, the power of the new energy station is reduced to (P) wj0 -0.9P wi0 ) And obtaining the dominant instability mode M of the system under the disturbance through simulation calculation j Power angle stability margin η δj Voltage stability margin η Vj 。
If M is i ＝M j And | η δi -η δj |≤ε δ And | η Vi -η Vj |≤ε V The new energy field stations i and j are connected to the same new energy region low-voltage ride-through information collecting station, otherwise, the new energy field stations i and j are connected to the same new energy region low-voltage ride-through information collecting station, epsilon δ And ε V Defining the deviation bearable by the power angle stability margin and the voltage stability margin when the influence sensitivities of different new energy stations are the same, and proposing epsilon δ ,ε V ＝5％。
And when the monitored bus voltage and the power of a power transmission channel are different values, the control strategy table corresponds to the direct current power emergency increasing or reducing amount, the new energy unit power emergency increasing or reducing amount, the conventional generator unit amount and the load removing amount.
Performing offline time domain simulation calculation, developing based on a typical operation mode of a power grid, and making a fixed offline control strategy table; the online time domain simulation calculation is performed by performing rolling calculation according to a real-time operation mode of a power grid, and an online control strategy table is formed by performing real-time refreshing according to a simulation calculation result; when the online computing function is unavailable or the online time domain simulation computing function is unavailable, executing a control strategy by using a control strategy table obtained by offline time domain simulation; and when the online policy table refreshed in real time exists, executing the control policy according to the online policy table.
The invention relates to an emergency control system for dealing with low voltage ride through of a large-scale new energy unit, which needs to build an emergency control main station, a low voltage ride through information substation, a new energy region low voltage ride through information gathering station, a low voltage ride through emergency control substation and a low voltage ride through emergency control execution station in a power grid control system, wherein,
the emergency control main station is used for receiving the low-voltage ride-through information sent by the low-voltage ride-through information substation, acquiring the monitored bus voltage of the key node of the power grid and the power of the key transmission section line, and issuing an emergency control command to the corresponding low-voltage ride-through emergency control substation according to the control strategy table;
the low-voltage ride-through information substation is used for receiving low-voltage ride-through information sent by the new energy field station and sending the information to the corresponding low-voltage ride-through information collecting station of the new energy region;
the new energy region low voltage ride through information collection station is used for receiving low voltage ride through information sent by each corresponding low voltage ride through information substation and sending a low voltage ride through signal and the total amount of generated power entering low voltage ride through in the new energy field station to the emergency control master station;
the low-voltage ride-through emergency control substation comprises a direct-current emergency control substation, a new energy emergency control substation, a generator tripping emergency control substation and a load shedding emergency control substation, wherein the low-voltage ride-through emergency control substation acquires available information of control resources through each low-voltage ride-through emergency control execution station, transmits the information to an emergency control main station, receives an emergency control command sent by the emergency control main station and transmits the information to each low-voltage ride-through emergency control execution station.
The low voltage ride through emergency control execution station comprises a direct current emergency control execution station, a new energy emergency control execution station, a generator tripping execution station and a load tripping execution station, sends available information of control resources to the corresponding low voltage ride through emergency control substation, and receives and executes an emergency control command sent by the emergency control substation.
The embodiment provides an emergency control method for dealing with low voltage ride through of a large-scale new energy unit. The emergency control for dealing with the low voltage ride through of the large-scale new energy unit means that when the new energy unit enters the low voltage ride through due to power grid disturbance, the power output of the new energy is greatly reduced, the power generation and load power of the power grid are unbalanced, and the system frequency is reduced; meanwhile, large-scale power flow transfer of the system can be caused, and the problem of power angle stability or voltage stability can be caused. And the low voltage ride through signal of the new energy unit is used as a fault trigger signal to implement the emergency control of the power grid, so that the condition that the stability of the power grid is damaged due to the low voltage ride through of the large-scale new energy unit is avoided.
The emergency control system for dealing with the low voltage ride through of the large-scale new energy resource unit comprises an emergency control main station, a low voltage ride through information substation, a new energy region low voltage ride through information gathering station, a low voltage ride through emergency control substation and a low voltage ride through emergency control execution station.
The low-voltage ride-through information substation is used for receiving low-voltage ride-through information sent by the new energy field station and sending the information to the emergency control main station. The substation in the grid control system can be utilized as a low voltage ride through information substation. When a new energy unit enters low-voltage ride through under the disturbance of a power grid, the low-voltage ride through information substation can send low-voltage ride through information to a low-voltage ride through information collecting station of a new energy area in a power grid control system through a high-speed digital communication network based on optical fibers. The transmission capability of the high-speed digital communication network should be not less than 1Mbps, so that the low voltage ride through information can be quickly and stably transmitted to the new energy region low voltage ride through information gathering station.
The low voltage ride through information collecting station of the new energy region in the power grid control system is used for receiving low voltage ride through information sent by each corresponding low voltage ride through information substation and sending a low voltage ride through signal and the total generating power amount entering low voltage ride through in the new energy station to the emergency control master station.
The emergency control master station in the power grid control system is used for monitoring the bus voltage of the key node of the power grid and the power of the key transmission section line and issuing an emergency control command to the corresponding low-voltage ride-through emergency control substation according to the control strategy table.
Bus voltage of the new energy station and power information of a key transmission section line are acquired by a WAMS (Wide Area Measurement System) System. The emergency control master station and the main network regulation and control center WAMS system adopt the same time setting source so as to conveniently identify the information acquisition time.
And when the monitored bus voltage and the power of a power transmission channel are different values, the control strategy table corresponds to the direct current power emergency increasing or reducing amount, the new energy unit power emergency increasing or reducing amount, the conventional generator unit amount and the load removing amount. Developing off-line time domain simulation calculation based on a typical operation mode of a power grid, and formulating a fixed off-line control strategy table; the online time domain simulation calculation is to perform rolling calculation according to the real-time operation mode of the power grid and refresh the rolling calculation in real time according to the simulation calculation result to form an online control strategy table; when the online computing function is not available or the online time domain simulation computing function is unavailable, executing a control strategy by using a control strategy table obtained by offline time domain simulation; and when the online policy table refreshed in real time exists, executing the control policy according to the online policy table.
The low-voltage ride-through emergency control substation comprises a direct-current emergency control substation, a new energy emergency control substation, a cutter emergency control substation and a load shedding emergency control substation, wherein the low-voltage ride-through emergency control substation acquires available information of control resources through each low-voltage ride-through emergency control execution station, sends the information to an emergency control main station through a high-speed digital communication network based on optical fibers, receives an emergency control command sent by the emergency control main station and sends the information to each low-voltage ride-through emergency control execution station. The transmission capability of the high-speed digital communication network should be not less than 1Mbps, so that the available information of each control resource can be quickly and stably transmitted to the emergency control master station and the phase modulator excitation control system.
The low-voltage ride-through emergency control execution station comprises a direct-current emergency control execution station, a new energy emergency control execution station, a generator tripping execution station and a load tripping execution station, transmits available information of control resources to a corresponding low-voltage ride-through emergency control substation through a high-speed digital communication network based on optical fibers, and receives and executes an emergency control command issued by the emergency control substation. Wherein the transmission capability of the high-speed digital communication network should be no less than 1Mbps, so that the available information can be quickly and stably transmitted to the emergency control substation.
The implementation process of this embodiment is shown in fig. 1, that is, the low voltage ride through information substation sends information to the low voltage ride through information collection station in the new energy region; the new energy region low voltage ride through information collection station sends new energy field station low voltage ride through information with similar influence in the region to the emergency control master station; the emergency control master station acquires the monitored bus voltage of the key node of the power grid and the power of the key transmission section line; the emergency control master station matches a proper emergency control measure from the control strategy table and sends the appropriate emergency control measure to the low-voltage ride-through emergency control substation; and the low voltage ride through emergency control sub-station sends an emergency control command to the low voltage ride through emergency control execution station to complete emergency control. The specific process of the present embodiment is described in further detail below.
Step 1 describes that when the new energy unit enters low voltage ride through due to power grid disturbance, the low voltage ride through information substation receives low voltage ride through information from the new energy field station and sends the low voltage ride through information to the new energy region low voltage ride through information collection station.
And 2, after receiving the low voltage ride through information, the new energy region low voltage ride through information gathering station sends the low voltage ride through information to the low voltage ride through control main station.
Step 3 describes that the control master station acquires the monitored power grid key node bus voltage and key transmission section line power, and acquires available information of various control resources in the power grid, wherein the key node bus voltage and key transmission section line power information can be acquired through a Wide Area Monitoring System (WAMS) System in the power grid.
Step 4 describes that the emergency control main station comprehensively controls the resource available information according to the low voltage ride through information, the acquired bus voltage and the power transmission section power information, matches a proper emergency control measure from the control strategy table and sends the information to the low voltage ride through emergency control substation;
step 5 describes that the low voltage ride through emergency control substation issues control commands, including emergency power boost or speed reduction of direct current, emergency power boost or speed reduction of the new energy unit, conventional generator set cutting, load cutting, emergency control of the direct current emergency control execution station, the new energy emergency control execution station, the generator cutting execution station and the load cutting execution station is finished, and the method is finished.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An emergency control method for dealing with low voltage ride through of a large-scale new energy unit is characterized by comprising the following steps:
receiving low voltage ride through information sent by a wind turbine generator or a photovoltaic generator;
calculating the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid, and accessing the low voltage ride through information substations of the new energy stations with the same influence sensitivity to the low voltage ride through information collecting station of the same new energy region;
sending the received low voltage ride through information to an emergency control master station;
acquiring monitored bus voltage of a key node of a power grid and key transmission section line power, and acquiring available information of various control resources in the power grid;
according to the low-voltage ride-through information, the collected bus voltage, the power information of the key transmission section line and the available information of the control resource, matching corresponding emergency control measures from a preset control strategy table, and sending the emergency control measures to a low-voltage ride-through emergency control substation;
sending an emergency control command to a low voltage ride through emergency control execution station to complete emergency control;
the method for calculating the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid comprises the following steps:
acquiring a typical operation mode of a power grid, and based on the initial power P of a preset new energy station i wi0 And the power of the new energy station is reduced to 10 percent P by low voltage ride through wi0 Calculating to obtain the dominant instability mode M of the system under disturbance i Power angle stability margin η δi Voltage stability margin η Vi ；
Initial power P of new energy station j based on presetting wj0 The power of the new energy station is reduced to (P) by the low voltage ride through wj0 -0.9P wi0 ) Calculating to obtain the dominant instability mode M of the system under disturbance j Power angle stability margin η δj Voltage stability margin η Vj ；
If M is i ＝M j And | η δi -η δj |≤ε δ And | η Vi -η Vj |≤ε V The new energy field stations i and j are connected to the same new energy region low-voltage ride-through information collecting station, otherwise the new energy field stations i and j are connected to different new energy region low-voltage ride-through information collecting stations, epsilon δ And ε V The power angle stability margin and the voltage stability margin can be borne by different new energy stations with the same influence sensitivity.
2. The emergency control method for handling low voltage ride through of large scale new energy resource fleet according to claim 1, wherein the low voltage ride through information comprises a fleet low voltage ride through signal and a total amount of generated power entering the low voltage ride through in the new energy resource farm;
the control resources comprise direct current, a new energy station, a conventional unit and load;
the available information includes dc and emergency available support power, new energy station and emergency available regulated power, conventional generator set and power, load station and power, which can be used for emergency control.
3. The emergency control method for dealing with the low voltage ride through of the large-scale new energy source unit according to claim 1, wherein the key node bus voltage of the power grid and the key transmission section line power are obtained through a wide area monitoring system in the power grid.
4. The emergency control method for handling the large-scale new energy resource unit low voltage ride through according to claim 1, wherein the emergency control command comprises an emergency dc power boost or speed reduction, an emergency new energy resource unit power boost or speed reduction, a conventional generator unit cut-off and a load cut-off.
5. The emergency control method for dealing with the low voltage ride through of the large-scale new energy resource unit according to claim 1, wherein the control strategy table is formulated according to offline time domain simulation calculation or online time domain simulation calculation, and when the information of the control strategy table includes different power combinations sent by each new energy region low voltage ride through information collection station, when the monitored bus voltage and power transmission channel power are different values, the corresponding direct current power emergency boost or speed reduction amount, the new energy resource unit power emergency boost or speed reduction amount, the conventional generator unit amount is cut off, and the load amount is cut off.
6. The emergency control method for dealing with the low voltage ride through of the large-scale new energy source unit according to claim 5, wherein the offline time domain simulation calculation is developed based on a typical operation mode of a power grid, and a fixed offline control strategy table is formulated;
the online time domain simulation calculation is to perform rolling calculation according to the real-time operation mode of the power grid and refresh the rolling calculation in real time according to the simulation calculation result to form an online control strategy table;
when the online computing function is not available or the online time domain simulation computing function is unavailable, executing a control strategy by using a control strategy table obtained by offline time domain simulation; and when the online policy table refreshed in real time exists, executing the control policy according to the online policy table.
7. An emergency control system for coping with low voltage ride through of a large-scale new energy unit is characterized by comprising
The emergency control main station is used for receiving the low-voltage ride-through information sent by the low-voltage ride-through information substation, acquiring the monitored bus voltage of the key node of the power grid and the power of the key transmission section line, and issuing an emergency control command to the corresponding low-voltage ride-through emergency control substation according to a preset control strategy table;
the low-voltage ride-through information substation is used for receiving low-voltage ride-through information sent by the new energy field station and sending the low-voltage ride-through information to the corresponding low-voltage ride-through information gathering station of the new energy region;
the new energy region low-voltage ride-through information collection station is used for receiving low-voltage ride-through information sent by each corresponding low-voltage ride-through information substation and sending a low-voltage ride-through signal and the total amount of generated power entering low-voltage ride-through in the new energy field station to the emergency control main station;
the low-voltage ride-through emergency control sub-station acquires available information of control resources through each low-voltage ride-through emergency control execution station, uploads the available information to the emergency control main station, receives an emergency control command sent by the emergency control main station, and sends the emergency control command to each low-voltage ride-through emergency control execution station;
the low voltage ride through emergency control execution station is used for sending available information of control resources to the corresponding low voltage ride through emergency control substation and receiving and executing an emergency control command sent by the low voltage ride through emergency control substation;
the method for calculating the sensitivity of the influence of low voltage ride through of different new energy stations on the stability characteristics of the power grid comprises the following steps:
acquiring a typical operation mode of a power grid, and based on the initial power P of a preset new energy station i wi0 The power of the new energy station is reduced to 10 percent P by low voltage ride through wi0 Calculating to obtain the dominant instability mode M of the system under disturbance i Power angle stability margin η δi Voltage stability margin η Vi ；
Based onPresetting initial power P of new energy station j wj0 The power of the new energy station is reduced to (P) by the low voltage ride through wj0 -0.9P wi0 ) Calculating to obtain the dominant instability mode M of the system under disturbance j Power angle stability margin η δj Voltage stability margin η Vj ；
If M is i ＝M j And | η δi -η δj |≤ε δ And | η Vi -η Vj |≤ε V The new energy field stations i and j are connected to the same new energy region low-voltage ride-through information collecting station, otherwise the new energy field stations i and j are connected to different new energy region low-voltage ride-through information collecting stations, epsilon δ And ε V The power angle stability margin and the voltage stability margin tolerance deviation are defined when the influence sensitivity of different new energy field stations is the same.
8. The emergency control system for handling low voltage ride through of large scale new energy fleet according to claim 7, wherein said low voltage ride through emergency control substations comprises a direct current emergency control substation, a new energy emergency control substation, a cutter emergency control substation, a load shedding emergency control substation and a low voltage ride through emergency control substation.
9. The emergency control system for handling low voltage ride through of large scale new energy fleet according to claim 7, wherein the low voltage ride through emergency control execution station comprises a dc emergency control execution station, a new energy emergency control execution station, a generator tripping execution station and a load shedding execution station.
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