CN116345482A - Centralized coordination control method and device for new energy station - Google Patents
Centralized coordination control method and device for new energy station Download PDFInfo
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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
- H02J3/12—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
- H02J3/38—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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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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- 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
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- 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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Abstract
The invention discloses a centralized coordination control method and a centralized coordination control device for a new energy station, which are suitable for photovoltaic coordination control and energy storage coordination control, and are used for performing policy calculation of inertia response and low voltage ride through by collecting station main circuit grid-connected point parameter information, and completing centralized coordination control of inertia response and low voltage ride through of a photovoltaic energy storage system under a dynamic working condition by current distribution logic; the centralized coordination control device comprises a photovoltaic energy storage coordination controller, a photovoltaic coordination controller and an energy storage coordination controller, and the centralized coordination control device is utilized to realize the centralized coordination control of each converter unit in the new energy field aiming at dynamic performance optimization. The invention is suitable for optimizing the dynamic performance of the new energy station, realizing the centralized coordination control of low voltage ride through and inertia response under the dynamic working condition, improving the response consistency, and simultaneously, setting different control strategies according to different user requirements, thereby realizing multipurpose development.
Description
Technical Field
The invention relates to a centralized coordination control method and device for a new energy station, and belongs to the field of grid-connected operation of photovoltaic energy storage systems.
Background
With the large amount of access of new energy power generation to the power grid, the characteristics of intermittent property, volatility and randomness make the power grid face the challenges of safe and stable operation increasingly, and the power grid is hindered from absorbing new energy.
The problem of randomness and fluctuation of power generation can be counteracted by configuring energy storage for new energy power generation. However, in the new energy power station configuration energy storage system which is put into operation at present, the energy storage system is only used for steady-state peak regulation and frequency modulation. Aiming at the dynamic state and the transient state of energy storage of a new energy station, particularly the supporting function under the fault state is still to be perfected, the active and reactive supporting functions of the energy storage on the power grid are not fully excavated when the power grid is abnormal, and the dynamic supporting function of the power grid is not fully utilized.
At present, for the support function under the transient condition, the existing implementation strategies are basically carried out by the converter itself; considering more and more new energy power generation stations and energy storage converters, because of the dispersibility of information acquisition and the like in each converter, each converter can respond to the transient condition of the power grid in an inconsistent manner; the inconsistency of the responses can cause cross interference among all converters, and the real-time performance and the accuracy of the responses of the stations to the transient condition of the power grid are affected.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the utility model provides a new energy station centralized coordination control method and device, which carries out the strategy calculation of inertia response and low voltage ride through by collecting the station main circuit grid-connected point parameter information, and completes the centralized coordination control of inertia response and low voltage ride through of the photovoltaic energy storage system under the dynamic working condition by the current distribution logic, thereby improving the consistency of the response.
The invention adopts the following technical scheme for solving the technical problems:
the centralized coordination control method for the new energy station is suitable for coordination control of the photovoltaic converter unit and the energy storage converter unit in the new energy station, and comprises a low-voltage ride-through centralized control method and an inertia response centralized control method, wherein,
the low voltage ride through centralized control method comprises the following steps:
(11) Collecting the voltage of a grid-connected point of a new energy station, and calculating the frequency and the voltage amplitude of the grid-connected point according to the voltage of the grid-connected point;
(12) Judging whether to switch the low voltage ride through state or not according to the voltage amplitude, namely switching from a steady state to the low voltage ride through state; if yes, entering (13);
(13) Executing a strategy of low voltage ride through response, and generating a low voltage state switching signal and a reactive current reference signal;
(14) The generated low-voltage state switching signal and reactive current reference signal are transmitted to the photovoltaic converter unit and the energy storage converter unit after passing through a current distribution logic;
the inertia response centralized control method comprises the following steps:
(21) Collecting the grid-connected point voltage of the new energy station, and calculating the grid-connected point frequency, the voltage amplitude and the grid-connected point frequency change rate according to the grid-connected point voltage;
(22) Filtering aliasing noise in the frequency change rate through a variable parameter filter to obtain the frequency change rate after variable parameter filtering, judging whether an inertia response state is enabled or not according to the frequency change rate after variable parameter filtering, and if yes, entering (23);
(23) Executing an inertia response strategy, and generating an active reference value corresponding to the inertia response;
(24) And the generated active reference value is transmitted to the photovoltaic converter unit and the energy storage converter unit after passing through the current distribution logic.
As a preferred embodiment of the present invention, in the step (12), it is determined whether to switch the low voltage ride through state according to the voltage amplitude, specifically:
if the voltage amplitude is |U pcc |＜ Hysteresis of U Threshold (threshold) Switching the low voltage ride through state, otherwise, not switching; u (U) Threshold (threshold) Is a voltage threshold.
As a preferable mode of the present invention, the step (13) further includes calculating a required time of the low voltage ride through, and determining whether the required time of the low voltage ride through is overtime, and if so, issuing overtime state quantity information.
As a preferable scheme of the present invention, in the step (21), the frequency of the grid-connected point and the frequency change rate of the grid-connected point are obtained by using a frequency locking loop FLL, and the specific steps are as follows:
1) Will be grid-connected point voltage u pcc After Clark conversion, the voltage u is obtained αβ ；
2) Voltage u αβ Generating two groups of orthogonal signals v after second-order generalized integration αβ And qv αβ ；
3) By u αβ 、v αβ And qv αβ Performing cross product frequency discrimination to estimate frequency deviation epsilon f ；
4) Frequency deviation epsilon using loop filter f Carrying out static error-free tracking to obtain angular acceleration beta;
5) According to the angular acceleration, obtaining an angular velocity omega by using a voltage-controlled oscillator, wherein the angular velocity omega is simultaneously applied to the second-order generalized integral of the step 2) to generate a quadrature signal;
6) The grid-connected point frequency f and the grid-connected point frequency change rate can be obtained through the angular velocity omega and the angular acceleration beta
As a preferred embodiment of the present invention, in the step (22), whether to enable the inertia response state is determined according to the frequency change rate after the variable parameter filtering, specifically:
if the following conditions are satisfied:
then inertia response status switching is performed, otherwise no switching is performed, +.>
For the frequency change rate after the parametric filtering, Δf is the frequency deviation.
The new energy station centralized coordination control device comprises a photovoltaic energy storage coordination controller, a photovoltaic coordination controller and an energy storage coordination controller, wherein the photovoltaic energy storage coordination controller is arranged on the upper layer of control and controls a subordinate photovoltaic coordination controller and the energy storage coordination controller, and the photovoltaic coordination controller and the energy storage coordination controller respectively control the subordinate photovoltaic converter unit and the energy storage converter unit;
the photovoltaic energy storage coordination controller comprises: the system comprises an information acquisition unit, a first upper instruction communication unit, a control unit, a first lower instruction communication unit and a first state information display unit;
the information acquisition unit is used for acquiring the grid-connected point voltage of the new energy station, and calculating the grid-connected point frequency, the voltage amplitude and the grid-connected point frequency change rate according to the grid-connected point voltage;
the first upper instruction communication unit is used for receiving external control instructions, including active, reactive and current instruction values and start-stop and enable function mode instructions;
the control unit is used for generating control instructions for the subordinate photovoltaic coordination controller and the energy storage coordination controller according to the external control instructions;
the first lower instruction communication unit is used for acquiring the running states of the subordinate photovoltaic coordination controllers and the energy storage coordination controllers, acquiring the active power and the reactive power of each photovoltaic converter unit subordinate to the photovoltaic coordination controllers, acquiring the active power, the reactive power and the SOC value of each energy storage converter unit subordinate to the energy storage coordination controllers, and issuing the instructions generated by the control units to the subordinate photovoltaic coordination controllers and the energy storage coordination controllers;
the first state information display unit is used for displaying the running state of the photovoltaic energy storage coordination controller;
the photovoltaic coordination controller comprises: a second upper instruction communication unit, a second function control unit, a second lower instruction communication unit, and a second status information display unit; the energy storage coordination controller comprises: a third upper instruction communication unit, a third function control unit, a third lower instruction communication unit, and a third status information display unit;
the second upper instruction communication unit is used for communicating with the photovoltaic energy storage coordination controller to acquire control instructions, including active, reactive and current instruction values, and start-stop and enable function mode instructions;
the second function control unit is used for realizing the low-voltage ride through centralized control method in the new energy station centralized coordination control method;
the second lower instruction communication unit is used for acquiring the running state of the subordinate photovoltaic converter units and acquiring the active power and the reactive power of each photovoltaic converter unit;
the second state information display unit is used for displaying the running state of the photovoltaic coordination controller;
the third upper instruction communication unit is used for communicating with the photovoltaic energy storage coordination controller to acquire control instructions, including active, reactive and current instruction values, and start-stop and enable function mode instructions;
the third function control unit is used for realizing the inertia response centralized control method in the new energy station centralized coordination control method;
the third lower instruction communication unit is used for acquiring the running state of the subordinate energy storage converter units and acquiring the active power, reactive power and SOC value of each energy storage converter unit;
the third state information display unit is used for displaying the running state of the energy storage coordination controller.
A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the new energy station centralized coordination control method as described above.
A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the new energy station centralized coordination control method as described above.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
1. the invention is suitable for photovoltaic coordination control and energy storage coordination control, performs strategy calculation of inertia response and low voltage ride through by collecting substation main circuit grid-connected point parameter information, and completes centralized coordination control of inertia response and low voltage ride through of the photovoltaic energy storage system under dynamic working conditions by current distribution logic.
2. According to the invention, by collecting parameter information of the main circuit grid-connected point, the dispersibility of data collection for the station caused by that each converter only collects own information is avoided, dynamic coordination control optimization is carried out in a centralized way, and the consistency of dynamic response of the system is improved.
3. The invention is easy to expand, and is suitable for large new energy stations and small stations.
Drawings
FIG. 1 is a flow chart of a centralized coordination control method in an embodiment of the invention;
FIG. 2 is a schematic diagram of a system architecture of a centralized coordination control device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another system architecture of the centralized coordination control apparatus according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
The invention provides a centralized coordination control method for a new energy station, which is suitable for photovoltaic coordination control and energy storage coordination control, and is used for performing policy calculation of inertia response and low voltage ride through by collecting station main circuit grid-connected point parameter information, and completing centralized coordination control of low voltage ride through and inertia response of a photovoltaic energy storage system under a dynamic working condition by current distribution logic.
As shown in fig. 1, the invention avoids the dispersion of data acquisition for a station caused by that each converter only acquires own information by acquiring the parameter information of the main circuit grid-connected point; after the main circuit information is collected, carrying out related strategy calculation of low voltage ride through and inertia response; and finally, obtaining instruction organization signals of all the converters through current distribution logic.
The low voltage ride through centralized control method comprises the following steps:
s01, collecting grid-connected point voltage u pcc And calculate the frequency f of the point of connection according to the voltage pcc Voltage amplitude |u pcc |；
S02, judging whether to switch the low voltage ride through state according to the information such as the current voltage amplitude and the like;
(1) When meeting the condition |U pcc |＜ Hysteresis of U Threshold (threshold) Generating a low-voltage state switching signal; and executing a low voltage response strategy; wherein, photovoltaic converter and energy storage converter reactive current I T The expressions are respectively:
wherein I is T-shaped photovoltaic 、I T energy storage Reactive current per unit amplitude corresponding to the photovoltaic converter unit and the energy storage converter unit respectively, U T For the per-unit amplitude of the voltage, i.e. above |U pcc | (the same applies below); i T As reactive reference value.
(2) Calculating the required time of low voltage ride through;
wherein t is T-shaped photovoltaic 、t T energy storage The required time of low voltage ride through corresponding to the photovoltaic converter unit and the energy storage converter unit is in unit s; interp1 () is a linear interpolation;
(3) Judging whether the low voltage ride through time is overtime; the low voltage ride through time is timed as follows:
when T is since >t T When the voltage is overtime, the low voltage crossing is overtime, and the state quantity information is issued;
s03, executing a strategy of low voltage ride through response if the switching condition is met, and generating a low voltage state signal and a reactive current reference signal;
s04, the generated low-voltage state signal and reactive current reference signal are transmitted to a photovoltaic coordination control device and an energy storage coordination control device attached to the photovoltaic energy storage coordination control device after passing through a current distribution logic, and finally transmitted to each energy storage converter and each photovoltaic converter unit or directly transmitted to the photovoltaic converter unit and the energy storage converter unit;
the reactive reference values issued are:
wherein I is q (k) And F (-) is an algorithm corresponding to the current distribution logic for the instruction value corresponding to the kth group of converters.
The inertia response centralized control method comprises the following steps:
(21) Collecting the voltage u of the grid-connected point pcc And calculate the frequency f of the point of connection according to the voltage pcc Voltage amplitude |u pcc The frequency change rate of the grid connection point is angular acceleration beta pcc ；
Here, the frequency f is obtained by using the frequency-locked loop FLL pcc Angular acceleration beta pcc The specific strategies for the signals are as follows:
1)u pcc through abc->After dq transformation, u is obtained αβ ；
2)u αβ Generating 2 groups of orthogonal signals v after second-order generalized integration αβ 、qv αβ Corresponding to u respectively α And u β ，qv α And qv β Orthogonalization;
3) Simplified cross product frequency discrimination to estimate frequency deviation epsilon f ；
In the method, in the process of the invention,
representing the value of vector u sampled at time n, +.>
Representing the value of vector v sampled at time n-1, < >>
Representing the sampled value of vector qv at time n;
4) For frequency deviation epsilon f The signal is subjected to a loop filter to obtain an angular acceleration β=lf (epsilon) f )；
5) The voltage-controlled oscillator obtains angular frequency which is simultaneously used for second-order generalized integration to generate quadrature signals;
the angular velocity omega and the angular acceleration beta can be used for obtaining the frequency f and the frequency change rate
(22) Judging whether the inertia response state is enabled or not according to the current frequency change rate, frequency deviation and derivative conditions of frequency deviation energy;
(1) Rate of change of frequency
Filtering possibly aliased noise by a variable parameter filter, and filtering frequencies by the variable parameter filter
And->
Positive correlation;
the variable parameter filter can be used in cascade for multiple times, and the corresponding filtering angular frequency of the filter is positively correlated with the absolute value of the input signal of the stage;
(2) When the following conditions are met, the inertia response function enters a switching state;
(3) After meeting the condition, the inertia response function obtains a power per unit instruction value after switching;
wherein T is J The unit s is the inertia time constant of the wind power plant, and the typical value is 4-12 s; f (f) N Is rated at a frequency of typically 50Hz;
the frequency change rate after the variable parameter filtering is the frequency change rate;
(23) Executing an inertia response strategy if the response condition is met, and generating an active reference value corresponding to the inertia response;
(24) After passing through the current distribution logic, the generated active reference value is issued to a photovoltaic coordination control device and an energy storage coordination control device which are attached to the photovoltaic energy storage coordination control device and finally issued to each energy storage converter and each photovoltaic converter unit or directly issued to the photovoltaic converter unit and the energy storage converter unit;
wherein P (k) is an instruction value corresponding to a kth group of current transformers, and F (·) is an algorithm corresponding to a current distribution logic; p (P) * A steady-state power value; ΣΔp i Active instruction values for other constraints.
The invention also provides a new energy station centralized coordination control device, which comprises a photovoltaic energy storage coordination controller, a photovoltaic coordination controller and an energy storage coordination controller; the system architecture is schematically shown in fig. 2, the photovoltaic energy storage coordination controller is arranged on the upper layer of control, and the photovoltaic coordination controller and the energy storage coordination controller under control; the photovoltaic coordination controller and the energy storage coordination controller respectively control the subordinate photovoltaic converter unit and the energy storage converter unit.
The photovoltaic energy storage coordination controller comprises: the system comprises an information acquisition unit, an upper instruction communication unit, a control unit, a lower instruction communication unit and a state information display unit.
The information acquisition unit is used for acquiring main circuit information of the system, including the voltage of the system grid-connected point, and calculating the grid-connected point frequency, the angular frequency and the voltage amplitude according to the voltage;
the upper instruction communication unit is used for communicating with a remote dispatching system or a local monitoring system, and acquiring control instructions, including active, reactive and current instruction values, and start-stop and enable function mode instructions;
the control unit is used for realizing the centralized control of the system by the centralized coordination control method;
the lower instruction communication unit is used for acquiring a lower control device to communicate, acquiring a lower running state, acquiring active power and reactive power of each subunit in the photovoltaic unit, acquiring active power, reactive power and SOC value of each subunit in the energy storage unit, and issuing a control command generated by the functional control unit to each lower control unit;
a state information display unit for displaying the operation state of the liquid crystal display device and related warning information;
the information acquisition unit transmits the acquired information to the function control unit among the units; the upper instruction communication unit and the function control unit realize the transmission of instructions and information; the lower instruction communication unit and the function control unit realize the transmission of instructions and information; the status information display unit receives information of the function control unit.
The photovoltaic coordination controller and the energy storage coordination controller both comprise: an upper instruction communication unit, a function control unit, a lower instruction communication unit, and a status information display unit.
The upper instruction communication unit is used for communicating with the photovoltaic energy storage coordination control device, and acquiring control instructions, including active, reactive and current instruction values, and start-stop and enabling function mode instructions;
the function control unit is used for realizing the centralized control of the system according to the centralized coordination control method;
the lower instruction communication unit is used for acquiring a lower control device to communicate, acquiring a lower running state, acquiring active power and reactive power of each subunit in the photovoltaic unit, acquiring active power, reactive power and SOC value of each subunit in the energy storage unit, and issuing a control command generated by the functional control unit to each lower control unit;
a state information display unit for displaying the operation state of the liquid crystal display device and related warning information;
the upper instruction communication unit and the function control unit realize the transmission of instructions and information among the units; the lower instruction communication unit and the function control unit realize the transmission of instructions and information; the status information display unit receives information of the function control unit.
The photovoltaic energy storage coordination controller, the photovoltaic coordination controller and the energy storage coordination controller are configured in different numbers according to the size of the system; the photovoltaic coordination controller and the energy storage coordination controller can still support configuration of the coordination controller, and hierarchical expansion of the coordination control device is realized.
The other system architecture provided by the invention is schematically shown in fig. 3, and the photovoltaic energy storage coordination controller can also directly coordinate and control the photovoltaic converter unit and the energy storage converter unit, so that flexible coordination control on the small-system station is realized.
Based on the same inventive concept, the embodiments of the present application provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the foregoing centralized coordination control method for a new energy station when executing the computer program.
Based on the same inventive concept, the embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the aforementioned new energy station centralized coordination control method.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. 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 above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (8)
1. The centralized coordination control method for the new energy station is suitable for coordination control of the photovoltaic converter unit and the energy storage converter unit in the new energy station, and is characterized by comprising a low-voltage ride-through centralized control method and an inertia response centralized control method,
the low voltage ride through centralized control method comprises the following steps:
(11) Collecting the voltage of a grid-connected point of a new energy station, and calculating the frequency and the voltage amplitude of the grid-connected point according to the voltage of the grid-connected point;
(12) Judging whether to switch the low voltage ride through state or not according to the voltage amplitude, namely switching from a steady state to the low voltage ride through state; if yes, entering (13);
(13) Executing a strategy of low voltage ride through response, and generating a low voltage state switching signal and a reactive current reference signal;
(14) The generated low-voltage state switching signal and reactive current reference signal are transmitted to the photovoltaic converter unit and the energy storage converter unit after passing through a current distribution logic;
the inertia response centralized control method comprises the following steps:
(21) Collecting the grid-connected point voltage of the new energy station, and calculating the grid-connected point frequency, the voltage amplitude and the grid-connected point frequency change rate according to the grid-connected point voltage;
(22) Filtering aliasing noise in the frequency change rate through a variable parameter filter to obtain the frequency change rate after variable parameter filtering, judging whether an inertia response state is enabled or not according to the frequency change rate after variable parameter filtering, and if yes, entering (23);
(23) Executing an inertia response strategy, and generating an active reference value corresponding to the inertia response;
(24) And the generated active reference value is transmitted to the photovoltaic converter unit and the energy storage converter unit after passing through the current distribution logic.
2. The centralized coordination control method of a new energy station according to claim 1, wherein in the step (12), whether to switch the low voltage ride through state is determined according to the voltage amplitude, specifically:
if the voltage amplitude is |U pcc |＜ Hysteresis of U Threshold (threshold) Switching the low voltage ride through state, otherwise, not switching; u (U) Threshold (threshold) Is a voltage threshold.
3. The centralized coordination control method of a new energy station according to claim 1, wherein the step (13) further comprises calculating a required time of low voltage ride through, judging whether the required time of the low voltage ride through is overtime, and if so, issuing overtime state quantity information.
4. The centralized coordination control method of a new energy station according to claim 1, wherein in the step (21), a frequency-locked loop FLL is adopted to obtain a grid-connected point frequency and a grid-connected point frequency change rate, and the method is specifically as follows:
1) Will be grid-connected point voltage u pcc After Clark conversion, the voltage u is obtained αβ ；
2) Voltage u αβ Generating two groups of orthogonal signals v after second-order generalized integration αβ And qv αβ ；
3) By u αβ 、v αβ And qv αβ Performing cross product frequency discrimination to estimate frequency deviation epsilon f ；
4) Frequency deviation epsilon using loop filter f Carrying out static error-free tracking to obtain angular acceleration beta;
5) According to the angular acceleration, obtaining an angular velocity omega by using a voltage-controlled oscillator, wherein the angular velocity omega is simultaneously applied to the second-order generalized integral of the step 2) to generate a quadrature signal;
6) The grid-connected point frequency f and the grid-connected point frequency change rate can be obtained through the angular velocity omega and the angular acceleration beta
5. The centralized coordination control method of a new energy station according to claim 1, wherein in the step (22), whether to enable the inertia response state is determined according to the frequency change rate after the variable parameter filtering, specifically:
if the following conditions are satisfied:
then inertia response status switching is performed, otherwise no switching is performed, +.>
For the frequency change rate after the parametric filtering, Δf is the frequency deviation.
6. The centralized coordination control device for the new energy station is characterized by comprising a photovoltaic energy storage coordination controller, a photovoltaic coordination controller and an energy storage coordination controller, wherein the photovoltaic energy storage coordination controller is arranged at the upper layer of control and controls a subordinate photovoltaic coordination controller and an energy storage coordination controller, and the photovoltaic coordination controller and the energy storage coordination controller respectively control the subordinate photovoltaic converter unit and the energy storage converter unit;
the photovoltaic energy storage coordination controller comprises: the system comprises an information acquisition unit, a first upper instruction communication unit, a control unit, a first lower instruction communication unit and a first state information display unit;
the information acquisition unit is used for acquiring the grid-connected point voltage of the new energy station, and calculating the grid-connected point frequency, the voltage amplitude and the grid-connected point frequency change rate according to the grid-connected point voltage;
the first upper instruction communication unit is used for receiving external control instructions, including active, reactive and current instruction values and start-stop and enable function mode instructions;
the control unit is used for generating control instructions for the subordinate photovoltaic coordination controller and the energy storage coordination controller according to the external control instructions;
the first lower instruction communication unit is used for acquiring the running states of the subordinate photovoltaic coordination controllers and the energy storage coordination controllers, acquiring the active power and the reactive power of each photovoltaic converter unit subordinate to the photovoltaic coordination controllers, acquiring the active power, the reactive power and the SOC value of each energy storage converter unit subordinate to the energy storage coordination controllers, and issuing the instructions generated by the control units to the subordinate photovoltaic coordination controllers and the energy storage coordination controllers;
the first state information display unit is used for displaying the running state of the photovoltaic energy storage coordination controller;
the photovoltaic coordination controller comprises: a second upper instruction communication unit, a second function control unit, a second lower instruction communication unit, and a second status information display unit; the energy storage coordination controller comprises: a third upper instruction communication unit, a third function control unit, a third lower instruction communication unit, and a third status information display unit;
the second upper instruction communication unit is used for communicating with the photovoltaic energy storage coordination controller to acquire control instructions, including active, reactive and current instruction values, and start-stop and enable function mode instructions;
the second function control unit is used for realizing a low voltage ride through centralized control method in the centralized coordination control method of the new energy station according to any one of claims 1-6;
the second lower instruction communication unit is used for acquiring the running state of the subordinate photovoltaic converter units and acquiring the active power and the reactive power of each photovoltaic converter unit;
the second state information display unit is used for displaying the running state of the photovoltaic coordination controller;
the third upper instruction communication unit is used for communicating with the photovoltaic energy storage coordination controller to acquire control instructions, including active, reactive and current instruction values, and start-stop and enable function mode instructions;
the third function control unit is used for realizing an inertia response centralized control method in the new energy station centralized coordination control method according to any one of claims 1-6;
the third lower instruction communication unit is used for acquiring the running state of the subordinate energy storage converter units and acquiring the active power, reactive power and SOC value of each energy storage converter unit;
the third state information display unit is used for displaying the running state of the energy storage coordination controller.
7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the new energy site centralized coordination control method of any of claims 1 to 5.
8. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the new energy site centralized coordination control method of any one of claims 1 to 5.
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