CN114899819A - New energy power station energy storage system transient overvoltage control method and device - Google Patents
New energy power station energy storage system transient overvoltage control method and device Download PDFInfo
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- CN114899819A CN114899819A CN202210642832.8A CN202210642832A CN114899819A CN 114899819 A CN114899819 A CN 114899819A CN 202210642832 A CN202210642832 A CN 202210642832A CN 114899819 A CN114899819 A CN 114899819A
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J13/00004—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 the power network being locally controlled
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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
- H02J13/00016—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 using a wired telecommunication network or a data transmission bus
- H02J13/00017—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 using a wired telecommunication network or a data transmission bus using optical fiber
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a transient overvoltage control method for an energy storage system of a new energy power station, wherein the energy storage system comprises the following steps: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit, including the following step: acquiring a voltage detection value and a current detection value of an energy storage system of the new energy power station, and carrying out dq conversion on the voltage detection value and the current detection value; obtaining a phase angle through an active frequency unit according to a rotor motion equation; according to the dq conversion result of the voltage detection value and the current detection value, acquiring a voltage calibration value through a reactive voltage control unit, an inner ring voltage control unit and an inner ring current control unit; and adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to inhibit the transient overvoltage.
Description
Technical Field
The invention relates to the technical field of energy storage system control, in particular to a transient overvoltage control method for an energy storage system of a new energy power station.
Background
At present, the typical devices applied to new energy power stations for suppressing transient overvoltage mainly include a conventional phase modulator and a static synchronous compensator (STATCOM). The phase modulator is used as synchronous rotating equipment and is electromagnetically coupled with an alternating current power grid, and the spontaneous reactive response without time delay reflects the electrical characteristics of the synchronous power grid. The phase regulator has a delay capability (reactive power generation) which can reach a plurality of times of rated value and far exceeds STATCOM, but has a poor phase advancing capability (reactive power absorption) which is only slightly higher than half of the rated value. The STATCOM is a voltage source converter composed of turn-off power electronic devices such as IGBTs as non-rotating equipment, and reactive power exchange between the STATCOM and a power grid can be essentially equivalent to a charging and discharging process between a direct-current side voltage-stabilizing capacitor and the power grid. Although the two devices have different principles, the two devices can realize dynamic reactive power support, so that the transient overvoltage suppression function is achieved.
For a phase modulation machine, a fan/photovoltaic host, a STATCOM and an energy storage system are generally configured in a new energy station. If the phase modulator is configured again, the problems of complex operation and maintenance and higher operation and maintenance cost can be caused. For the STATCOM, although the transient overvoltage suppression function under some faults can be realized, the reactive response of the STATCOM can be realized only through a series of links such as sampling, calculation and output, and the reactive response is slower than the electromagnetic coupling characteristic of synchronous rotating equipment. At present, the control response speed of the STATCOM cannot quickly follow the voltage level change caused by the failure of direct-current power transmission commutation, and a reverse regulation effect is generated, so that the overvoltage is further increased.
Disclosure of Invention
The embodiment of the invention aims to provide a transient overvoltage control method for an energy storage system of a new energy power station, which solves the problems of complex operation and maintenance and higher operation and maintenance cost of a synchronous phase modulator on one hand; on the other hand, the problem that the STATCOM control response speed cannot quickly follow the voltage change is solved by using the high-performance control system and the control method thereof.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a method for controlling transient overvoltage of an energy storage system of a new energy power station, where the energy storage system includes: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit, including the following step:
acquiring a voltage detection value and a current detection value of an energy storage system of the new energy power station, and carrying out dq conversion on the voltage detection value and the current detection value;
obtaining a phase angle through the active frequency unit according to a rotor motion equation;
acquiring a voltage calibration value through the reactive voltage control unit, the inner ring voltage control unit and the inner ring current control unit according to the dq conversion result of the voltage detection value and the current detection value;
and adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to suppress transient overvoltage.
Further, the obtaining of the voltage calibration value through the reactive voltage control unit, the inner loop voltage control unit and the inner loop current control unit according to the voltage detection value and the current detection value includes the following steps:
acquiring a voltage instruction value through the reactive voltage control unit;
calculating the current instruction value according to the voltage instruction value and the voltage detection value based on the inner loop voltage control unit;
and calculating the voltage calibration value according to the current instruction value and the current detection value based on the inner loop current control unit.
Further, the converter module includes: the direct current/alternating current inverter is connected with the direct current voltage source, the direct current/alternating current inverter and the grid-connected filter circuit in sequence.
Further, the control module includes: the master control unit and the plurality of slave station local units of the master-slave ring network structure;
and the plurality of slave station on-site units are respectively connected with the converters in a one-to-one correspondence manner.
Further, the master control unit and the plurality of slave station local units perform data interaction through an optical fiber network.
Further, the slave site units adopt a distributed clock synchronization technology.
Further, the mathematical model of the rotor equation of motion is:
in the formula: t is J As the inertia time constant, ω is the angular velocity, Δ ω ═ ω - ω 0 ，ω 0 At a rated speed, P m 、P e And D are mechanical power, electromagnetic power and damping coefficient, respectively, and theta is a phase angle.
Accordingly, a second aspect of the embodiments of the present invention provides a transient overvoltage control device for an energy storage system of a new energy power station, where the energy storage system includes: energy module, ac ware module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit include:
the detection module is used for acquiring a voltage detection value and a current detection value of the energy storage system of the new energy power station and carrying out dq conversion on the voltage detection value and the current detection value;
a first calculation module, which is used for obtaining a phase angle according to a rotor motion equation through the active frequency unit;
a second calculation module, configured to obtain a voltage calibration value through the reactive voltage control unit, the inner loop voltage control unit, and the inner loop current control unit according to a dq conversion result of the voltage detection value and the current detection value;
and the voltage adjusting module is used for adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to inhibit transient overvoltage.
Further, the second calculation module includes:
a first calculation unit for acquiring a voltage instruction value by the reactive voltage control unit;
a second calculation unit for calculating the current command value from the voltage command value and the voltage detection value based on the inner-loop voltage control unit;
a third calculation unit for calculating the voltage calibration value from the current command value and the current detection value based on the inner loop current control unit.
Further, the converter module includes: the direct current/alternating current inverter is connected with the direct current voltage source, the direct current/alternating current inverter and the grid-connected filter circuit in sequence.
Further, the control module includes: the master control unit and the plurality of slave station local units of the master-slave ring network structure;
the plurality of slave station on-site units are respectively connected with the current transformers in a one-to-one correspondence mode.
Further, the master control unit and the plurality of slave station local units perform data interaction through an optical fiber network.
Further, the slave site units adopt a distributed clock synchronization technology.
Further, the mathematical model of the rotor equation of motion is:
in the formula: t is J Is an inertia time constant, omega is an angular velocity, and delta omega is omega-omega 0 ，ω 0 At a rated speed, P m 、P e And D are mechanical power, electromagnetic power and damping coefficient, respectively, and theta is a phase angle.
Accordingly, a third aspect of embodiments of the present invention provides an electronic device, comprising: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the processor to execute the new energy power station energy storage system transient overvoltage control method.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, implement the new energy power station energy storage system transient overvoltage control method as described in any one of the above.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the converter is controlled according to a preset control strategy, an internal reference voltage is established, and power output is adjusted to help maintain the voltage, so that the whole system has the characteristic that the voltage at the direct current side can keep constant, and on one hand, the problems of complex operation and maintenance and high operation and maintenance cost of the synchronous phase modulator are solved; on the other hand, the problem that the STATCOM control response speed cannot quickly follow the voltage change is solved by using the high-performance control system and the control method thereof.
Drawings
FIG. 1 is a schematic diagram of an energy storage system of a new energy power station according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a converter module of an energy storage system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an energy storage system control module provided by an embodiment of the invention;
fig. 4 is a flowchart of a transient overvoltage control method for an energy storage system of a new energy power station according to an embodiment of the present invention;
fig. 5a is a block diagram of transient overvoltage control of an energy storage system of a new energy power station according to an embodiment of the present invention;
fig. 5b is a block diagram of active frequency control provided by the embodiment of the present invention;
FIG. 5c is a block diagram of reactive voltage control provided by an embodiment of the present invention;
FIG. 6 is a block diagram of rotor equation control provided by an embodiment of the present invention;
fig. 7 is a block diagram of a transient overvoltage control device of an energy storage system of a new energy power station according to an embodiment of the present invention;
fig. 8 is a block diagram of a second computing module provided in an embodiment of the invention.
Reference numerals:
1. the device comprises a detection module, 2, a first calculation module, 3, a second calculation module, 31, a first calculation unit, 32, a second calculation unit, 33, a third calculation unit, 4 and a voltage adjustment module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It is to be understood that these descriptions are only illustrative and are not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5a, fig. 5b, and fig. 5c, a first aspect of an embodiment of the present invention provides a method for controlling transient overvoltage of an energy storage system of a new energy power station, where the energy storage system includes: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit, including the following step:
and S100, acquiring a voltage detection value and a current detection value of the energy storage system of the new energy power station, and carrying out dq conversion on the voltage detection value and the current detection value.
And step S200, obtaining a phase angle through an active frequency unit according to a rotor motion equation.
And step S300, acquiring a voltage calibration value through the reactive voltage control unit, the inner ring voltage control unit and the inner ring current control unit according to the dq conversion result of the voltage detection value and the current detection value.
And step S400, adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to suppress the transient overvoltage.
The control module controls the converter according to a designed control strategy, establishes an internal reference voltage and adjusts the power output to help maintain the voltage so that the overall system exhibits a voltage source characteristic in which the dc side voltage can remain constant. By simulating the operating characteristics of the traditional synchronous machine and utilizing the energy stored in the energy unit, the system can provide fault current and system inertia for the power grid like a synchronous motor, the power grid strength is enhanced, the dynamic change of the power grid is responded, and the voltage and the frequency of the power grid are automatically adjusted, so that the operating stability level of the power system in a high-proportion new energy region is improved, and the generated transient overvoltage is restrained.
Specifically, in step S400, based on the phase angle and the voltage calibration value, the output voltage of the dc side of the energy storage system is adjusted to a preset voltage value, and the specific calculation process is as follows:
wherein v is d Is d-axis voltage, v q Is the q-axis voltage, v 0 Is a constant value v a Is a phase voltage, v b Is a b-phase voltage, v c Is the c-phase voltage and is the c-phase voltage,
is a transformation matrix of dq0 coordinate system to abc coordinate system, T sync Is a conversion matrix from the abc coordinate system to the dq0 coordinate system, and ω t is an included angle between the coordinate systems.
Specifically, in step S300, obtaining a voltage calibration value through the reactive voltage control unit, the inner loop voltage control unit, and the inner loop current control unit according to the voltage detection value and the current detection value includes the following steps:
and S310, acquiring a voltage command value through a reactive voltage control unit.
And S320, calculating a current instruction value according to the voltage instruction value and the voltage detection value based on the inner ring voltage control unit.
Specifically, based on the inner loop voltage control unit, the no-difference adjustment is performed through the PI link according to the difference between the voltage command value and the voltage detection value.
And S330, calculating a voltage calibration value according to the current instruction value and the current detection value based on the inner loop current control unit.
Specifically, based on the inner loop current control unit, the no-difference adjustment is performed through the PI environment according to the difference between the current instruction value and the current detection value.
The active frequency control unit and the reactive voltage control unit control phase angles and voltage amplitude values. Specifically, the active frequency control unit can calculate a phase angle theta through droop control according to a rotor motion equation, and the reactive voltage control unit outputs a voltage instruction V cmd Calculating a current instruction I through the inner ring voltage and inner ring current control module cmd In combination with the phase angle θ, the target voltage is output.
Further, the converter module comprises: the direct current/alternating current inverter is connected with the direct current voltage source, the direct current/alternating current inverter and the grid-connected filter circuit in sequence. Compared with a conventional converter, the converter module has stronger overload capacity, so that short-time fault current and inertia support can be provided for a system, and the converter module has the capacity of enhancing the system strength of a weak power grid area and providing inertia support.
The improvement of the overload capacity of the converter depends on the inherent performance of an inversion module power electronic device (IGBT) on one hand; on the other hand, the IGBT chip, the packaging bottom plate and the radiator are required to be integrally and optimally designed and manufactured, and the inverter can bear temperature fluctuation caused by overload during operation without influencing the service life of the inverter.
Further, the control module includes: the master control unit and the plurality of slave station local units of the master-slave ring network structure; and the plurality of slave station local units are respectively connected with the converters in a one-to-one correspondence manner. Specifically, the master control unit and the plurality of slave station local units perform data interaction through an optical fiber network. The slave station local units adopt a distributed clock synchronization technology.
Referring to fig. 3, the control module control system combines industrial ethernet communication and distributed real-time control technology, and adopts a master-slave ring network structure to realize real-time synchronous unified control on a plurality of novel inverters, and has the capability of uniformly and quickly controlling a plurality of objects. The main station controller has the functions of real-time fast operation, real-time sampling and the like. The slave station local units are various measurement and control nodes and respectively carry out point-to-point rapid communication with each inverter. Each local unit is synchronized by adopting a distributed clock technology, so that the measurement and control consistency of each point is good. The master station and the plurality of slave stations do not need a switch and are directly connected through optical fibers by adopting a high-speed real-time network. Various control functions can be designed according to the control strategy, the main station controller is used for carrying out rapid operation, the control instructions of the inverters are uniformly sent to the local control unit in real time, and the inverters are uniformly controlled in real time to realize various high-level functions.
Further, referring to fig. 6, the mathematical model of the rotor equation of motion is:
in the formula: t is J Is an inertia time constant, omega is an angular velocity, and delta omega is omega-omega 0 ，ω 0 At a rated speed, P m 、P e And D are mechanical power, electromagnetic power and damping coefficient, respectively, and theta is a phase angle.
The numerical value of the angular velocity omega can be obtained by calculating the change rate of the phase angle of the connected power system; the mechanical power is provided for the prime mover and can be a rated value; the electromagnetic power is the output power at the generator end, and the value of the electromagnetic power is related to the state of the machine set.
The transient overvoltage control method of the energy storage system of the new energy power station utilizes the overload capacity of a converter (PCS) of an electrochemical energy storage system and adopts a high-performance control system and a control method thereof to inhibit the transient overvoltage generated by system faults, particularly the transient overvoltage caused by the commutation failure of direct-current power transmission. On one hand, the energy storage module is used for restraining transient overvoltage, so that the problems of complex operation and maintenance and high operation and maintenance cost of the synchronous phase modulator can be solved, and on the other hand, the high-performance control module and the control method thereof are used for solving the problem that the STATCOM control response speed cannot quickly follow the voltage change.
Accordingly, referring to fig. 7, a second aspect of the embodiment of the present invention provides a transient overvoltage control device for an energy storage system of a new energy power station, where the energy storage system includes: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit include:
the detection module 1 is used for acquiring a voltage detection value and a current detection value of the energy storage system of the new energy power station and carrying out dq conversion on the voltage detection value and the current detection value;
the first calculation module 2 is used for acquiring a phase angle according to a rotor motion equation through an active frequency unit;
the second calculation module 3 is used for acquiring a voltage calibration value through the reactive voltage control unit, the inner ring voltage control unit and the inner ring current control unit according to the dq conversion result of the voltage detection value and the current detection value;
and the voltage adjusting module 4 is used for adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to suppress the transient overvoltage.
Further, referring to fig. 8, the second calculating module 3 includes:
a first calculation unit 31 for acquiring a voltage instruction value by the reactive voltage control unit;
a second calculation unit 32 for calculating a current command value from the voltage command value and the voltage detection value based on the inner-loop voltage control unit;
and a third calculating unit 33 for calculating a voltage calibration value from the current command value and the current detection value based on the inner loop current control unit.
Further, the converter module comprises: the direct current/alternating current inverter is connected with the direct current voltage source, the direct current/alternating current inverter and the grid-connected filter circuit in sequence.
Further, the control module includes: the master control unit and the plurality of slave station local units of the master-slave ring network structure; and the plurality of slave station local units are respectively connected with the converters in a one-to-one correspondence manner. Specifically, the master control unit and the plurality of slave station local units carry out data interaction through an optical fiber network; the slave station local units adopt a distributed clock synchronization technology.
Further, the mathematical model of the rotor equation of motion is:
in the formula: t is J Is an inertia time constant, omega is an angular velocity, and delta omega is omega-omega 0 ，ω 0 At a rated speed, P m 、P e And D are mechanical power, electromagnetic power and damping coefficient, respectively, and theta is a phase angle.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the storage stores instructions which can be executed by a processor, and the instructions are executed by the processor, so that at least one processor executes the transient overvoltage control method of the energy storage system of the new energy power station.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, implement any one of the new energy power station energy storage system transient overvoltage control methods described above.
The embodiment of the invention aims to protect a transient overvoltage control method of an energy storage system of a new energy power station, wherein the energy storage system comprises: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit, including the following step: acquiring a voltage detection value and a current detection value of an energy storage system of the new energy power station, and carrying out dq conversion on the voltage detection value and the current detection value; obtaining a phase angle through an active frequency unit according to a rotor motion equation; according to the dq conversion result of the voltage detection value and the current detection value, acquiring a voltage calibration value through a reactive voltage control unit, an inner ring voltage control unit and an inner ring current control unit; and adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to inhibit the transient overvoltage. The technical scheme has the following effects:
the converter is controlled according to a preset control strategy, an internal reference voltage is established, and power output is adjusted to help maintain the voltage, so that the whole system has the characteristic that the voltage at the direct current side can keep constant, and on one hand, the problems of complex operation and maintenance and high operation and maintenance cost of the synchronous phase modulator are solved; on the other hand, the problem that the STATCOM control response speed cannot quickly follow the voltage change is solved by using the high-performance control system and the control method thereof.
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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A transient overvoltage control method for an energy storage system of a new energy power station is characterized in that the energy storage system comprises the following steps: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit, including the following step:
acquiring a voltage detection value and a current detection value of a new energy station power grid, and carrying out dq conversion on the voltage detection value and the current detection value;
obtaining a phase angle through the active frequency unit according to a rotor motion equation;
acquiring a voltage calibration value through the reactive voltage control unit, the inner ring voltage control unit and the inner ring current control unit according to the dq conversion result of the voltage detection value and the current detection value;
and adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to suppress transient overvoltage.
2. The transient overvoltage control method of the energy storage system of the new energy power station according to claim 1, wherein the step of obtaining a voltage calibration value through the reactive voltage control unit, the inner loop voltage control unit and the inner loop current control unit according to the voltage detection value and the current detection value comprises the following steps:
acquiring a voltage instruction value through the reactive voltage control unit;
calculating the current instruction value according to the voltage instruction value and the voltage detection value based on the inner loop voltage control unit;
and calculating the voltage calibration value according to the current instruction value and the current detection value based on the inner loop current control unit.
3. The transient overvoltage control method of the energy storage system of the new energy power station according to claim 1,
the converter module includes: the direct current/alternating current inverter is connected with the direct current voltage source, the direct current/alternating current inverter and the grid-connected filter circuit in sequence.
4. The transient overvoltage control method of the energy storage system of the new energy power station according to claim 1,
the control module includes: the master control unit and the plurality of slave station local units of the master-slave ring network structure;
the plurality of slave station on-site units are respectively connected with the current transformers in a one-to-one correspondence mode.
5. The transient overvoltage control method of the energy storage system of the new energy power station according to claim 4,
and the master control unit and the plurality of slave station local units carry out data interaction through an optical fiber network.
6. The transient overvoltage control method of the energy storage system of the new energy power station as claimed in claim 3,
the slave station local units adopt a distributed clock synchronization technology.
7. The transient overvoltage control method of the energy storage system of the new energy power station according to claim 1,
the mathematical model of the rotor equation of motion is:
in the formula: t is J Is an inertia time constant, omega is an angular velocity, and delta omega is omega-omega 0 ，ω 0 At a rated speed, P m 、P e And D are mechanical power, electromagnetic power and damping coefficient, respectively, and theta is a phase angle.
8. The utility model provides a new forms of energy power station energy storage system transient state overvoltage control device which characterized in that, energy storage system includes: energy module, converter module and control module, control module includes: active frequency control unit, reactive voltage control unit, inner loop voltage control unit and inner loop current control unit include:
the detection module is used for acquiring a voltage detection value and a current detection value of the energy storage system of the new energy power station and carrying out dq conversion on the voltage detection value and the current detection value;
a first calculation module, which is used for obtaining a phase angle according to a rotor motion equation through the active frequency unit;
a second calculation module, configured to obtain a voltage calibration value through the reactive voltage control unit, the inner loop voltage control unit, and the inner loop current control unit according to a dq conversion result of the voltage detection value and the current detection value;
and the voltage adjusting module is used for adjusting the output voltage of the direct current side of the energy storage system to be a preset voltage value based on the phase angle and the voltage calibration value so as to inhibit transient overvoltage.
9. An electronic device, comprising: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to perform the new energy plant energy storage system over-voltage transient control method of any of claims 1-7.
10. A computer readable storage medium, characterized in that computer instructions are stored thereon, which when executed by a processor implement the new energy power station energy storage system transient overvoltage control method according to any one of claims 1 to 7.
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| CN117543518B (en) * | 2023-12-01 | 2024-05-03 | 国网青海省电力公司清洁能源发展研究院 | Transient overvoltage control system and method |
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