CN114069701B - Multi-time-scale power control system suitable for new energy station - Google Patents
Multi-time-scale power control system suitable for new energy station Download PDFInfo
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Classifications
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- 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
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- 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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The application discloses a multi-time scale power control system suitable for a new energy station, which comprises a station end stability control device, an edge control device and power control terminals corresponding to all power generation units, wherein the power control terminals are connected with the edge control device; the station-end stability control device receives a power grid safety and stability control instruction issued by a power grid stability control system and an externally input fine control function pressing plate input signal, and responds to the power grid safety and stability control instruction through a feeder circuit breaker control unit or completes fine control through an edge control device and a power control terminal according to the fine control function pressing plate input state and the working state of the station-end stability control device and the power control terminal, wherein the working state is sent by the edge control device; and when the edge control device does not receive the fine control command, the frequency active response control is performed through each power control terminal. The application can realize lean power control of the new energy station under the emergency condition of the power grid, and can be matched with second-level rapid frequency response when the frequency fluctuates, thereby improving the network source coordination capability of the new energy station.
Description
Technical Field
The application relates to the technical field of power systems and automation thereof, in particular to a multi-time scale power control system suitable for a new energy station.
Background
With the sequential operation of multi-circuit cross-region extra-high voltage direct current engineering, the 'strong and weak intersection' characteristic of the power grid is gradually outstanding, the grid-connected capacity of new energy sources such as wind power, photovoltaic and the like is increased in an explosive manner, the installed capacity of new energy sources of the northwest power grid is only approximate to one hundred million kilowatts, the power grid pattern and the power supply structure are greatly changed, the operation characteristics of the power grid are deeply changed, and new energy sources are also in a new vigorous development period. The new energy has intermittent, random and uncertain characteristics, and compared with the conventional unit, the control of the new energy has a large gap, the state sensing and control means of the new energy are insufficient, the control requirement of the new energy on the high-duty ratio power grid for safe and stable operation is difficult to meet, and the new energy consumption is restricted.
In the aspect of perception, the real-time monitoring capability of the state of the new energy power generation unit is insufficient, the real-time state change of the new energy power generation unit cannot be accurately perceived, and the emergency prevention and control of the large power grid cannot take more accurate control measures; in the aspect of control, a mode of cutting off new energy feeder lines is generally adopted in the emergency of a power grid at present, control measures are single and extensive, control granularity is large, new energy output loss is caused to a certain extent, and a new energy unit is directly cut off to control the feeder lines, so that risks of overvoltage, damage to components and the like exist; in addition, the current emergency control measures can only be cut off and cannot be flexibly adjusted, and the excellent power quick adjustment capability of the photovoltaic inverter cannot be exerted.
The new energy power generation such as wind power, photovoltaic and the like is rapidly developed, the space of a conventional water-thermal power generating unit with rotational inertia is occupied, the available rapid frequency response resources of a power grid are gradually reduced, and the frequency safety risk of the system is increased. In order to improve the frequency supporting capability of new energy to an electric power system and improve the network-related friendliness of the new energy, the participation of a new energy station in the rapid frequency response of a power grid becomes an urgent requirement.
Currently, in order to ensure safe and stable operation of a power grid, emergency control of new energy under the condition of power grid faults is realized, a power grid safe and stable control device is generally installed at a new energy station as a switching machine execution station, and millisecond-level (within 100ms is generally required) emergency control under the condition of power grid faults is realized. In order to realize active support of new energy to the power grid frequency, a rapid frequency response device is generally arranged at a new energy station and is matched with an energy management system in the new energy station to realize rapid frequency response in a second level (generally about 15s is required). The construction of multiple systems to meet different demands not only increases the investment cost of new energy stations, but also increases the difficulty and cost of operation, maintenance and management.
Disclosure of Invention
The application aims to provide a multi-time-scale power control system suitable for a new energy station, which realizes lean power control of the new energy station under the emergency of a power grid and second-level rapid frequency response when the frequency fluctuates, and realizes system fusion of different time scales. The technical scheme adopted by the application is as follows.
The application provides a multi-time scale power control system suitable for a new energy station, which comprises the following components: the system comprises a station end stability control device, an edge control device and a power control terminal, wherein the station end stability control device is respectively arranged corresponding to each new energy station, the edge control device is arranged at a new energy station grid connection point, and the power control terminal is respectively arranged corresponding to each power generation unit in the new energy station;
the station end stability control device is in communication connection with the power grid stability control system; in each new energy station, the edge control device is respectively connected and communicated with the station end stability control device and each power control terminal in the station;
the station end stability control device comprises a new energy feeder power acquisition unit and a feeder circuit breaker control unit;
each power control terminal monitors the power generation information of the corresponding power generation unit, and sends the power generation information to the edge control device, and the edge control device calculates the station output according to the received power generation information and sends the station output to the power grid stability control system through the station end stability control device; the edge control device also monitors the working state information of the edge control device and the power control terminal and sends the working state information to the station end stability control device;
the station-end stability control device receives a power grid safety and stability control command issued by a power grid stability control system and an externally input fine control function pressing plate input signal, responds to the power grid safety and stability control command through a feeder circuit breaker control unit or sends a fine control command to a power control terminal through an edge control device according to the fine control function pressing plate input state and the working states of the edge control device and the power control terminal, and completes fine control;
the edge control device also collects the active and frequency information of the station point of connection, and when the fine control command issued by the station-side stability control device is not received, the frequency active response control is carried out through each power control terminal according to the active and frequency information of the station point of connection.
Optionally, the fine control function pressing plate is a hard pressing plate, and when fine control is needed, a fine control function pressing plate input signal is sent to the station end stable control device after input operation is performed manually.
Optionally, the power grid safety and stability control instruction comprises a cut-off command, wherein the cut-off command comprises power information to be cut off;
after receiving the power grid safety and stability control instruction, the station end stability control device judges whether the current fine control function pressing plate is in a put-in state or not, and whether the edge control device and the power control terminal work abnormally or not:
if the fine control function pressing plate is in a put-in state and the edge control device and the power control terminal work normally, the station end stability control device sends a fine control command to the power control terminal through the edge control device according to the power grid safety stability control command, and fine control is completed;
if the fine control function pressing plate is in an unexpressed state or any one of the edge control device and the power control terminal works abnormally when a cutting command is received, the station end stability control device cuts off one or more feeder lines of corresponding power through the feeder line breaker control unit according to the cutting command.
In the scheme, the station end stability control device is provided with the new energy feeder line power acquisition unit, so that accurate cutting can be better realized when feeder lines are cut off.
Optionally, the station-end stability control device cuts off one or more feeder lines with corresponding power through a feeder line breaker control unit according to a cutting command, and the method is as follows:
acquiring power information of each new energy feeder line, arranging the power information according to the size sequence, and if P is met for the feeder line power of any ith row i <P<P i +P i+1 Where P is the power to be cut, P i <P i+1 The station-end stability control device cuts off P through the feeder circuit breaker control unit i And P i+1 Corresponding two feeder lines.
That is, as a preferable feeder line cutting mode, the application can be carried out by adopting a minimum oversection principle when cutting the feeder line, and the cutting command of the power grid stability control system is attached as much as possible, and simultaneously, the load and the power generation influence caused by the feeder line cutting are ensured to be minimized.
It can also be deduced from the upper cutting principle that when all feeder powers do not meet P i <P<P i +P i+1 When it is determined whether or not the P is satisfied i +P i+1 <P < P i +P i+1 +P i+2 If it is satisfied, then cut off P i 、P i+1 、P i+2 Corresponding three feeders, and so on.
Optionally, if the fine control function pressing plate is in a put-in state, and the edge control device and the power control terminal work normally, the station end stability control device sends a fine control command to the power control terminal through the edge control device according to the power grid safety stability control command, and the fine control is completed, including:
if the power grid safety and stability control instruction is a cut-off command, the station-end stability control device determines a power generation unit to be cut off according to the cut-off command and the power generation information of each power generation unit according to a preset fine control strategy, and forwards the cut-off control command to a power control terminal corresponding to the power generation unit to be cut off through the edge control device, so that the power control terminal responds to the cut-off control command to perform cut-off control operation of the power generation unit;
if the power grid safety and stability control command is an emergency power control command, the station-side stability control device calculates power adjustment targets of all power generation units based on power generation information of all power generation units sent by the edge control device according to a preset fine control strategy, and forwards the power adjustment targets to power control terminals corresponding to the power generation units through the edge control device, so that the power control terminals perform power control operation of the power generation units according to the power adjustment targets.
Optionally, a second-level fast frequency response control model and a millisecond-level emergency control model are preconfigured in the power control terminal;
the power control terminal executes a millisecond emergency control strategy when responding to a fine control command containing a power adjustment target issued by the edge control device, calculates a control quantity according to a millisecond emergency control model, and sends the control quantity to the main control of the power generation unit;
and the power control terminal executes a second-level rapid frequency response control strategy when responding to the frequency active response control command issued by the edge control device, calculates control quantity according to a second-level rapid frequency response control model, and sends the control quantity to the main control unit.
Optionally, in order to facilitate the power control terminal to better identify two power control commands issued by the edge control device, the fine control command and the frequency active response control command sent by the edge control device to the power control terminal respectively have a power fast control identification bit, where the power fast control identification of the fine control command is 1, and the power fast control identification of the frequency active response control command is 0.
Optionally, when the edge control device does not receive the fine control command issued by the station end stability control device, the edge control device performs frequency active response control through each power control terminal according to the station point-to-point active and frequency information, including:
the method comprises the steps of monitoring main transformer high-voltage side power P0 and frequency f in real time, and receiving the state Mj and active power Pj of each generating unit set uploaded by each power control terminal in real time;
and if the frequency f of the high-voltage side of the main transformer exceeds the frequency modulation dead zone fixed value, performing quick frequency response control according to a preset active frequency characteristic curve function, generating a control target value, and issuing and frequency initiative response control commands to each power control terminal according to the state of each generating unit set and the power average distribution principle.
Optionally, the edge control device locks the rapid frequency response control function when receiving a fine control command issued by the station-side stability control device; and whether the frequency f of the high-voltage side of the main transformer exceeds the frequency modulation dead zone constant value or not, a fine control command or a switching control command is issued to the power control terminal in response to the fine control command.
Optionally, when the station-end stability control device receives a switching command issued by the power grid stability control system, if the fine control function pressing plate is in an input state and the edge control device and each power control terminal work normally, the station-end stability control device calculates a generating unit set to be cut off according to the switching command, and the method comprises the following steps:
acquiring the working state and power information of a unit of each power generation unit;
for a unit working normally, sequencing according to the power;
for any unit arranged at the ith position, if the power of the unit meets P i <P<P i +P i+1 Where P is the power to be cut, P i <P i+1 Then P is taken i And P i+1 The corresponding unit is used as the generator unit to be cut off.
The reference station end stability control device executes the minimum over-cutting principle of cutting the feeder line, if all units do not meet the conditions, whether P is met or not is continuously judged i +P i+1 <P < P i +P i+1 +P i+2 If it is satisfied, then cut off P i 、P i+1 、P i+2 Corresponding three units, and so on.
When the method is applied, the interaction between the station-side stability control device and the power grid stability control system can upload real-time station unit state information and adjustable capacity related data, and the power grid stability control system decides whether to execute emergency power control on the corresponding new energy station according to the received uploading information. Therefore, when the station unit is abnormal or the station end stability control device sends abnormal information due to abnormal operation of the edge control device or the power control terminal, the upper power grid stability control system generally does not send an emergency power control instruction, and if the power grid stability control system sends the emergency control instruction, the fine control function hard pressing plate is not put into, or the situation that the edge control device, the power control terminal or the station end stability control device is abnormal in operation exists, the station end stability control device can execute feeder on-off operation to realize corresponding power adjustment.
Advantageous effects
The multi-time-scale power control system can solve the problems of accurate and flexible control of a new energy station under the emergency condition of a power grid and second-level rapid frequency response when the frequency fluctuates under the non-fine control requirement, can realize system fusion of different time scales, and is suitable for wind power plants or photovoltaic power stations. The system not only can solve the millisecond-level emergency control of the new energy station which is triggered by the power grid fault and takes a single power generation unit as a control object, realize accurate cutting or substitution cutting, but also can solve the active frequency support when the frequency of the grid-connected point of the new energy station is more limited, and improve the network source coordination capacity and the operation economic benefit of the new energy station.
Drawings
FIG. 1 is a schematic diagram of an exemplary architecture of a system according to the present application;
fig. 2 is a schematic diagram showing control association of a power control terminal in a system;
FIG. 3 is a schematic diagram of a process flow of the present application in response to a power grid issuing emergency cutter command;
fig. 4 is a schematic diagram of the control logic of the edge control device according to the present application.
Detailed Description
Further description is provided below in connection with the drawings and the specific embodiments.
The technical conception of the application is as follows: the millisecond-level new energy station emergency control triggered by the power grid fault is fused with the second-level active frequency response triggered by the grid-connected point frequency out-of-limit, so that the active frequency response control under the non-emergency control and the accurate power cutting or substitution cutting under the emergency control are realized.
Examples
As shown in fig. 1, the present application is applicable to a multi-time scale power control system of a new energy station, including: the system comprises a station end stability control device (device A) which is respectively arranged corresponding to each new energy station, an edge control device (device B) which is arranged at the point of connection with the new energy station, and a power control terminal (device C) which is respectively arranged corresponding to each power generation unit in the new energy station; the station end stability control device is in communication connection with the power grid stability control system; in each new energy station, the edge control device is respectively connected with the station end stability control device and each power control terminal in the station for communication.
The station end stability control device comprises a new energy feeder power acquisition unit and a feeder circuit breaker control unit, has the function of acquiring all new energy feeder power, is provided with a feeder circuit breaker interface loop, can receive the power of each power generation unit of the new energy sent by the edge control device, and makes a decision to execute the fine control of the power generation units or execute the feeder control under the abnormal condition of the system.
The station end stabilizing and controlling device is provided with a fine control function pressing plate for artificially influencing whether the station end stabilizing and controlling device needs to issue a fine control instruction to the edge control device, when the fine control function pressing plate is withdrawn, the fine control function is invalid, and the station end stabilizing and controlling device executes the traditional feeder cutting control according to the need.
The power control terminal collects the voltage and current of the network side of the power generation unit in a cable hard-wiring mode, and performs power calculation and running state judgment; the system is connected with a main controller of the new energy power generation unit in a rapid communication mode, and transmits a power control command to the power generation unit; information interaction is carried out between the optical fiber communication ring network and the edge control device through the field area; the network side circuit breaker is connected in a cable hard-wire mode.
Referring to fig. 2, each power control terminal monitors power generation information of a corresponding power generation unit, and sends the power generation information to an edge control device, the edge control device calculates station output according to the received power generation information, and the station output is sent to a power grid stability control system through a station end stability control device, and the power grid stability control system can judge whether the corresponding new energy station can perform emergency power control and station regulation and control capacity according to the received uplink information; the edge control device also monitors the working state information of the edge control device and the power control terminal and sends the working state information to the station-side stable control device, so that the station-side stable control device can know whether the edge control device and the power control terminal are abnormal or not in real time, and whether fine control is executed or not is determined.
And when the fine control command issued by the station-side stability control device is not received, the edge control device collects the station-grid-connection point active and frequency information, and performs frequency active response control through each power control terminal according to the station-grid-connection point active and frequency information.
The station-end stability control device receives a power grid safety stability control command issued by a power grid stability control system and an externally input fine control function pressing plate input signal, and responds to the power grid safety stability control command through a feeder circuit breaker control unit or sends a fine control command to the power control terminal through the edge control device according to the fine control function pressing plate input state and the working states of the edge control device and the power control terminal to finish fine control.
The control instruction sent by the power grid stability control system to the station-end stability control device is of two types, namely a switching instruction or an emergency power control instruction. After receiving the power grid safety and stability control instruction, the station end stability control device judges whether the current fine control function pressing plate is in an input state and whether the edge control device and the power control terminal work abnormally, referring to fig. 3, if the fine control function pressing plate is in the input state and the edge control device and the power control terminal work normally, the station end stability control device sends a fine control command to the power control terminal through the edge control device according to the power grid safety and stability control instruction to complete fine control, and the method comprises the following steps:
if the power grid safety and stability control instruction is a cut-off command, the station-end stability control device determines a power generation unit to be cut off according to the cut-off command and the power generation information of each power generation unit according to a preset fine control strategy, and forwards the cut-off control command to a power control terminal corresponding to the power generation unit to be cut off through the edge control device, so that the power control terminal responds to the cut-off control command to perform cut-off control operation of the power generation unit;
if the power grid safety and stability control command is an emergency power control command, the station-side stability control device calculates power adjustment targets of all power generation units based on power generation information of all power generation units sent by the edge control device according to a preset fine control strategy, and forwards the power adjustment targets to power control terminals corresponding to the power generation units through the edge control device, so that the power control terminals perform power control operation of the power generation units according to the power adjustment targets.
If a cutting command is received, the fine control function pressing plate is in an unexpended state, or any one of the edge control device and the power control terminal works abnormally, the station end stability control device cuts off one or more feeder lines with corresponding power through the feeder line breaker control unit according to the cutting command.
If the power grid stability control system issues an emergency control instruction, the hard pressing plate with the fine control function is not put into operation, or the situation that the edge control device, the power control terminal or the unit works abnormally exists, the station end stability control device can execute feeder on-off operation to realize corresponding power adjustment. However, in practical application, the interaction between the station-side stability control device and the power grid stability control system can upload real-time station unit state information and adjustable capacity related data, and the power grid stability control system decides whether to execute emergency power control on the corresponding new energy station according to the received uploading information. Therefore, when the station unit is abnormal or the station-side stability control device sends abnormal information due to abnormal operation of the edge control device or the power control terminal, the upper-level power grid stability control system generally does not send an emergency power control instruction.
As a preferable feeder line cutting mode, the embodiment can be carried out by adopting a minimum overstock principle when cutting the feeder line, and is attached to a cutting command of a power grid stability control system as much as possible, and simultaneously, the load and the power generation influence caused by the feeder line cutting are ensured to be minimized. The station end stability control device cuts off one or more feeder lines with corresponding power through the feeder line breaker control unit according to a cutting command, and specifically comprises the following steps:
acquiring power information of each new energy feeder line, arranging the power information according to the size sequence, and if P is met for the feeder line power of any ith row i <P<P i +P i+1 Wherein P is the power to be cut，P i <P i+1 The station-end stability control device cuts off P through the feeder circuit breaker control unit i And P i+1 Corresponding two feeder lines.
It can also be deduced from the upper cutting principle that when all feeder powers do not meet P i <P<P i +P i+1 When it is determined whether or not the P is satisfied i +P i+1 <P < P i +P i+1 +P i+2 If it is satisfied, then cut off P i 、P i+1 、P i+2 Corresponding three feeders, and so on.
Similarly, when the station-end stable control device receives a switching command issued by the power grid stable control system, if the fine control function pressing plate is in a put-in state and the edge control device and each power control terminal work normally, the station-end stable control device calculates a generating unit set to be cut off according to the switching command, and the system comprises:
acquiring the working state and power information of a unit of each power generation unit;
for a unit working normally, sequencing according to the power;
for any unit arranged at the ith position, if the power of the unit meets P i <P<P i +P i+1 Where P is the power to be cut, P i <P i+1 Then P is taken i And P i+1 The corresponding unit is used as the generator unit to be cut off.
The reference station end stability control device executes the minimum over-cutting principle of cutting the feeder line, if all units do not meet the conditions, whether P is met or not is continuously judged i +P i+1 <P < P i +P i+1 +P i+2 If it is satisfied, then cut off P i 、P i+1 、P i+2 Corresponding three units, and so on.
In this embodiment, the fusion of the second-level frequency active response and the millisecond-level emergency power control is embodied as:
referring to fig. 4, when the edge control device does not receive the fine control command issued by the station-side stability control device, the edge control device performs frequency active response control through each power control terminal according to the station-side network-connected point active and frequency information, including:
the method comprises the steps of monitoring main transformer high-voltage side power P0 and frequency f in real time, and receiving the state Mj and active power Pj of each generating unit set uploaded by each power control terminal in real time;
and if the frequency f of the high-voltage side of the main transformer exceeds the frequency modulation dead zone fixed value, performing quick frequency response control according to a preset active frequency characteristic curve function, generating a control target value, and issuing and frequency initiative response control commands to each power control terminal according to the state of each generating unit set and the power average distribution principle.
When the edge control device transmits the fine control command which comprises the adjustment target to each power control terminal when the fine control command is transmitted by the station-side stability control device, the power control terminal identifies the received control command and selects a corresponding control strategy to realize active frequency response control or emergency power control. The edge control device can send an instruction to the fan main control in a GOOSE command mode.
When receiving a fine control command issued by the station-side stability control device, the edge control device locks the rapid frequency response control function; and whether the frequency f of the high-voltage side of the main transformer exceeds the frequency modulation dead zone constant value or not, a fine control command or a switching control command is issued to the power control terminal in response to the fine control command.
In order to facilitate the power control terminal to better identify two power control commands issued by the edge control device, the fine control command and the frequency active response control command sent by the edge control device to the power control terminal are respectively provided with a power rapid control identification bit, wherein the power rapid control identification of the fine control command is 1, and the power rapid control identification of the frequency active response control command is 0.
Application example
The system of the present application will be described in detail with respect to a typical wind farm. The wind power plant comprises 20 fans, wherein the 20 fans are divided into 3 35kV feeder lines to be connected into a 35kV bus on the low-voltage side of a main transformer of a 110kV booster station, and the system structure of the application example is shown in a figure 1 and specifically comprises: 20 power control terminals, 1 edge control device and 1 station end stability control device and optical fiber communication network. The 20 power control terminals are arranged in a tower barrel of the wind turbine, are interconnected with a main control of the fan through an Ethernet GOOSE protocol, and collect three-phase voltage and current of a fan end; the 1 edge control device is arranged in a protection room of the wind power plant, acquires voltage and current of a high-voltage side of the main transformer, and is connected with 20 power control terminals through an optical fiber Ethernet; the 1 station end stability control device is arranged in a wind power plant protection room, is interconnected with a large power grid stability control system through a 2M channel, and is interconnected with the edge control device through an optical fiber. The system operation is mainly related to the following.
1) The station end stability control device monitors the power Pi of each feeder line (the power of the ith feeder line is represented) and the input condition of the fine control function pressing plate in real time, and the state of the feeding of the edge control device is abnormal.
2) When the fine control function pressing plate exits and receives the upper-level stabilizing device cutting command P, the corresponding feeder line is directly cut off. If P1< P2< P3, if P1< P < (P1+P2) is satisfied, the 1 st and 2 nd feeder lines are cut off directly.
3) When the fine control function pressing plate is put in, if the abnormal state sent by the edge control device is not received, the station end stability control device sends a cutting command P to the edge control device; and if the abnormal state sent by the edge control device is received, executing the operation of directly cutting off the corresponding feeder line in the step 2).
4) The edge control device monitors the power P0 and the frequency f of the high-voltage side of the main transformer in real time; receiving the state Mj and the active power Pj of each unit sent by the power control terminal in real time, and when Mj=1, indicating that the state of the jth fan is normal; and receiving a control command issued by the station-side stability control device in real time.
5) When the edge control device receives the cut-off command P, whether the frequency f exceeds the frequency modulation dead zone range or not at the moment, the cut-off command is issued to the power control terminal according to the execution fine control strategy.
6) And if the states Mj of the wind turbine generators are normal at this time, sequencing the wind turbine generators according to the power, and if the power P to be cut is larger than the sum of the powers of the 1 st to 13 th wind turbines and smaller than the sum of the powers of the 1 st to 14 th wind turbines, respectively sending a fan cutting command to the 1 st to 14 th power control terminals.
7) And when the 1 st to 14 th power control terminals receive the switching command, directly sending out a tripping outlet command, and tripping off a fan end breaker.
8) The edge control device presets the power control priority, preferentially executes the emergency control instruction of the novel power grid stability control device, and then executes the frequency quick response control, and when the emergency control is executed, the frequency quick response control is locked.
When the edge control device does not receive the switching command issued by the station-side stability control device, if the frequency f exceeds the frequency modulation dead zone fixed value, the rapid frequency response control is performed according to the active frequency characteristic curve function, a control target value is generated, a control command is issued to each power control terminal according to each unit state and the power average allocation principle, and the control command comprises a power rapid control identifier with the value of 0.
9) When the power control terminal receives a power control command with the power rapid control identifier of 0, an adjusting command is sent to the fan main control in a GOOSE command mode, and second-level power control is performed.
In summary, the embodiment and the application example construct a unified system platform, so that the conversion from the traditional control measure to the fine control measure is realized when the power grid fails, and the reliability of the execution of the safety and stability control measure of the power grid is improved to the greatest extent; meanwhile, the integration of the frequency active support of the new energy station to the power grid and the emergency control function triggered based on the power grid fault event is realized, the flexible control of various control measures of the new energy station is realized, and the network-related performance of the new energy station is improved.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are all within the protection of the present application.
Claims (9)
1. A multi-time scale power control system suitable for a new energy station, comprising: the system comprises a station end stability control device, an edge control device and a power control terminal, wherein the station end stability control device is respectively arranged corresponding to each new energy station, the edge control device is arranged at a new energy station grid connection point, and the power control terminal is respectively arranged corresponding to each power generation unit in the new energy station;
the station end stability control device is in communication connection with the power grid stability control system; in each new energy station, the edge control device is respectively in communication connection with the station end stability control device and each power control terminal in the station;
the station end stability control device comprises a new energy feeder power acquisition unit and a feeder circuit breaker control unit;
each power control terminal monitors the power generation information of the corresponding power generation unit, and sends the power generation information to the edge control device, and the edge control device calculates the station output according to the received power generation information and sends the station output to the power grid stability control system through the station end stability control device; the edge control device also monitors the working state information of the edge control device and the power control terminal and sends the working state information to the station end stability control device;
the station-end stability control device receives a power grid safety and stability control command issued by a power grid stability control system and an externally input fine control function pressing plate input signal, responds to the power grid safety and stability control command through a feeder circuit breaker control unit or sends a fine control command to a power control terminal through an edge control device according to the fine control function pressing plate input state and the working states of the edge control device and the power control terminal, and completes fine control;
the edge control device also collects the station point-of-sale active power and frequency information, and when the fine control command issued by the station-end stability control device is not received, the frequency active response control is carried out through each power control terminal according to the station point-of-sale active power and frequency information;
if the fine control function pressing plate is in a put-in state, and the edge control device and the power control terminal work normally, the station end stability control device sends a fine control command to the power control terminal through the edge control device according to the power grid safety stability control command, and fine control is completed, and the method comprises the following steps:
if the power grid safety and stability control instruction is a cut-off command, the station-end stability control device determines a power generation unit to be cut off according to the cut-off command and the power generation information of each power generation unit according to a preset fine control strategy, and forwards the cut-off control command to a power control terminal corresponding to the power generation unit to be cut off through the edge control device, so that the power control terminal responds to the cut-off control command to perform cut-off control operation of the power generation unit;
if the power grid safety and stability control command is an emergency power control command, the station-side stability control device calculates power adjustment targets of all power generation units based on power generation information of all power generation units sent by the edge control device according to a preset fine control strategy, and forwards the power adjustment targets to power control terminals corresponding to the power generation units through the edge control device, so that the power control terminals perform power control operation of the power generation units according to the power adjustment targets.
2. The multi-time scale power control system for a new energy station according to claim 1, wherein the fine control function pressing plate is a hard pressing plate, and when fine control is required, a fine control function pressing plate input signal is sent to the station-side stable control device after input operation is performed manually.
3. The multi-time scale power control system suitable for a new energy station of claim 1, wherein the grid safety and stability control instructions comprise a cut-off command comprising power information to be cut off;
after receiving the power grid safety and stability control instruction, the station end stability control device judges whether the current fine control function pressing plate is in a put-in state or not, and whether the edge control device and the power control terminal work abnormally or not:
if the fine control function pressing plate is in a put-in state and the edge control device and the power control terminal work normally, the station end stability control device sends a fine control command to the power control terminal through the edge control device according to the power grid safety stability control command, and fine control is completed;
if the fine control function pressing plate is in an unexpressed state or any one of the edge control device and the power control terminal works abnormally when a cutting command is received, the station end stability control device cuts off one or more feeder lines of corresponding power through the feeder line breaker control unit according to the cutting command.
4. The multi-time scale power control system for a new energy station according to claim 3, wherein the station-side stabilizing device cuts off one or more feeders of corresponding power through a feeder breaker control unit according to a cut-off command, comprising:
acquiring power information of each new energy feeder line, arranging the power information according to the size sequence, and for the feeder line power P arranged at any ith position i If P is satisfied i <P<P i +P i+1 Where P is the power to be cut, P i <P i+1 The station-end stability control device cuts off P through the feeder circuit breaker control unit i And P i+1 Corresponding two feeder lines.
5. The multi-time scale power control system applicable to the new energy station according to claim 1, wherein a second-level fast frequency response control model and a millisecond-level emergency control model are pre-configured in the power control terminal;
the power control terminal executes a millisecond emergency control strategy when responding to a fine control command containing a power adjustment target issued by the edge control device, calculates a control quantity according to a millisecond emergency control model, and sends the control quantity to the main control of the power generation unit;
and the power control terminal executes a second-level rapid frequency response control strategy when responding to the frequency active response control command issued by the edge control device, calculates control quantity according to a second-level rapid frequency response control model, and sends the control quantity to the main control unit.
6. The multi-time scale power control system for a new energy station of claim 5, wherein the fine control command and the frequency active response control command sent by the edge control device to the power control terminal have power fast control identification bits, respectively, wherein the power fast control identification of the fine control command is 1, and the power fast control identification of the frequency active response control command is 0.
7. The multi-time scale power control system for a new energy station according to claim 1, wherein the edge control device performs frequency active response control by each power control terminal according to station network-connected point active and frequency information when not receiving a fine control command issued by the station-side stability control device, and comprises:
real-time monitoring the power P0 and the frequency f at the high-voltage side of the main transformer, and receiving the state M of each generating unit set uploaded by each power control terminal in real time j And active power P j ；
When the frequency f of the high-voltage side of the main transformer exceeds the frequency modulation dead zone fixed value, performing quick frequency response control according to a preset active frequency characteristic curve function, generating a control target value, and issuing a frequency active response control command to each power control terminal according to the state of each generating unit set and the power average distribution principle.
8. The multi-time scale power control system for a new energy station according to claim 1, wherein the edge control device locks the fast frequency response control function when receiving a fine control command issued by the station-side stability control device; and whether the frequency f of the high-voltage side of the main transformer exceeds the frequency modulation dead zone constant value or not, a fine control command or a switching control command is issued to the power control terminal in response to the fine control command.
9. The multi-time scale power control system for a new energy station according to claim 1, wherein when the station-side stabilizing device receives a switching command issued by a power grid stabilizing system, if the fine control function pressing plate is in an input state and the edge control device and each power control terminal work normally, the station-side stabilizing device calculates a generating unit set to be cut off according to the switching command, and the system comprises:
acquiring the working state and power information of a unit of each power generation unit;
for a unit working normally, sequencing according to the power;
for any unit arranged at the j-th position, if the power P j Satisfy P j <P<P j +P j+1 Where P is the power to be cut, P j <P j+1 Then P is taken j And P j+1 The corresponding unit is used as the generator unit to be cut off.
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