CN116760061B - Control method for cascade power conversion of inertia supporting type bidirectional charging pile - Google Patents
Control method for cascade power conversion of inertia supporting type bidirectional charging pile Download PDFInfo
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims description 42
- 239000003990 capacitor Substances 0.000 description 24
- 238000007599 discharging Methods 0.000 description 9
- 230000001052 transient effect Effects 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000007665 sagging Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application relates to the technical field of bidirectional charging piles of electric automobiles, in particular to a control method for cascade power conversion of an inertia support type bidirectional charging pile, which is used for solving the problem that the inertia support type bidirectional charging pile in the prior art cannot truly realize the inertia support function of a power grid and participate in frequency modulation, and comprises the following steps: acquiring a typical control frame of an inertia supporting type bidirectional charging pile; adding an inertial support controller to the DC/DC power control link of the typical control framework; adding an instruction controller in the DC/DC power control link; and controlling cascade power conversion of the inertia support type bidirectional charging pile by utilizing the inertia support controller and the instruction controller.
Description
Technical Field
The application relates to the technical field of bidirectional charging piles of electric automobiles, in particular to a control method for cascade power conversion of an inertia supporting type bidirectional charging pile.
Background
An important mode of electric automobile bidirectional charging pile car network interaction is to operate as a virtual synchronous machine, serve as a distributed power supply to provide inertia support for a power grid, and further participate in frequency modulation of the power grid. A typical control method for an inertia supported bi-directional charging pile operating as a virtual synchronous machine is to use a current transformer to stabilize the intermediate DC bus voltage and DC/DC to accurately track the charge and discharge power. Under the control method, the DC/DC closed loop control power battery charging power is adopted, and a layer of direct current voltage control outer ring is needed to be added to the virtual synchronous machine, namely, the virtual synchronous machine power instruction of the AC/DC converter comes from the outer ring controlled by the direct current bus voltage.
However, in the existing inertia support type bidirectional charging pile control method, since the direct current side of the bidirectional charging pile virtual synchronous machine is DC/DC, when the power grid frequency of the power grid is temporarily reduced, the corresponding virtual inertia of the grid side virtual synchronous machine can generate instant power output, the dynamic balance between the grid side AC/DC power and the charging power of the DC/DC to the electric automobile is destroyed, the direct current capacitor voltage is collapsed under the initial transient state, and the inertia support type bidirectional charging pile cannot realize the power grid inertia support function. In addition, after the power grid frequency is temporarily reduced, the power generated by the sagging coefficient of the virtual synchronous machine of the bidirectional charging pile reduces the power of the virtual synchronous machine as a load, and the virtual synchronous machine reversely feeds power to the power grid even after the frequency deviation value is large to a certain extent, so that the power grid is involved in frequency modulation, but the direct-current voltage cannot be stabilized, the closed-loop control of the direct-current voltage can automatically adjust the power command of the virtual synchronous machine to offset the generated frequency modulation power, and the generated frequency modulation power is equal to the charging power output by the DC/DC, so that the existing inertia supporting bidirectional charging pile cannot realize the function of participating in frequency modulation. In summary, the prior art cannot truly realize the power grid inertia supporting function and the frequency modulation participating function of the inertia supporting type bidirectional charging pile, and has no practicability.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a control method for cascade power conversion of an inertia supporting type bidirectional charging pile.
In order to achieve the above object, the present application provides a control method for cascade power conversion of an inertia supporting type bidirectional charging pile, the method comprising the following steps: acquiring a typical control frame of an inertia supporting type bidirectional charging pile; adding an inertial support controller to the DC/DC power control link of the typical control framework; adding an instruction controller in the DC/DC power control link; and controlling cascade power conversion of the inertia support type bidirectional charging pile by utilizing the inertia support controller and the instruction controller. The inertia support controller and the instruction controller are utilized to realize the power grid inertia support function and the frequency modulation participation function of the inertia support type bidirectional charging pile.
Optionally, the inertial support controller includes a high pass filter, a transfer function of the high pass filter satisfying the following relationship:
wherein G is out Representing the transfer function of the high pass filter, s being the Lawster transform operator, k out For the gain factor, ω, of the high pass filter hp Is the cut-off angular frequency of the high pass filter.
Furthermore, the high-pass filter is used for enabling the power command of the DC/DC to instantly acquire the output power and change along with the output power when the frequency of the power grid suddenly changes, so that the rapid drop of the direct-current capacitor voltage at the direct-current side is avoided; meanwhile, under the steady state condition, the high-pass filter is in an open circuit state, so that the output active power of the virtual synchronous machine in the inertia support type bidirectional charging pile is determined by the charging and discharging power and the frequency modulation power of the electric automobile, and the inertia support type bidirectional charging pile is beneficial to realizing the power grid inertia support function and the frequency modulation participation function.
Optionally, the input signal of the inertial support controller includes a frequency modulation power signal output by a feedback branch consisting of droop coefficients in an active control loop of the virtual synchronous machine.
Optionally, the input signal of the inertial support controller further comprises a feedback signal of the virtual synchronous machine active control loop.
Optionally, the output signal of the inertial support controller is a power command feedforward signal.
Optionally, the feedback signal is added to the frequency modulation power signal after passing through the high pass filter to obtain the power command feedforward signal.
Optionally, the instruction controller is a low pass filter.
Optionally, the transfer function of the instruction controller satisfies the following relationship:
wherein G is ref Representing the transfer function of the instruction controller, s being the Lawster transform operator, ω p Is the cut-off angle frequency of the instruction controller.
Further, the instruction controller is used for reducing the change of instruction power in the inertia support type bidirectional charging pile, further reducing the fluctuation of direct-current capacitor voltage at the direct-current side, preventing the direct-current capacitor voltage from collapsing, and being beneficial to realizing the power grid inertia support function and the frequency modulation participation function of the inertia support type bidirectional charging pile.
Optionally, the command controller is located at a charge-discharge power command of the DC/DC power control link.
Optionally, the charge-discharge power command is added to the power command feedforward signal after passing through the command controller.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method for cascade power conversion of an inertia supported bidirectional charging pile according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a control architecture for cascaded power conversion of an inertia supported bi-directional charging pile according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an internal structure of an inertial support controller according to an embodiment of the present application;
fig. 4 is a schematic diagram of dc-side dc capacitor voltage curves of a conventional scheme and a patent corresponding scheme according to an embodiment of the present application;
fig. 5 is a schematic diagram of a network side VSG output active power curve of a conventional scheme and a patent corresponding scheme according to an embodiment of the present application;
fig. 6 is a schematic diagram of charge and discharge power curves of an electric vehicle according to a conventional scheme and a patent corresponding scheme in an embodiment of the present application.
Wherein: the system comprises a 1-DC/DC power control link, a 2-inertial support controller, a 3-instruction controller, a 4-virtual synchronous machine voltage control link, a 5-virtual synchronous machine active control loop, a 6-direct current voltage control outer loop, a 7-virtual synchronous machine reactive control loop and an 8-high pass filter.
Detailed Description
Specific embodiments of the application will be described in detail below, it being noted that the embodiments described herein are for illustration only and are not intended to limit the application. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the application. In other instances, well-known circuits, software, or methods have not been described in detail in order not to obscure the application.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale.
It should be noted in advance that in an alternative embodiment, the same symbols or alphabet meaning and number are the same as those present in all formulas, except where separate descriptions are made.
In an alternative embodiment, referring to fig. 1, the present application provides a control method for cascade power conversion of an inertia supported bidirectional charging pile, the method comprising the steps of:
s1, acquiring a typical control frame of the inertia supporting type bidirectional charging pile.
S2, adding an inertial support controller to the DC/DC power control link of the typical control framework.
Specifically, in the present embodiment, referring to fig. 2 and 3, in the DC/DC power control link 1, the inertial support controller 2 includes a high pass filter 8. In addition, the virtual synchronous machine voltage control link 2 comprises a direct current voltage control outer ring 6, a virtual synchronous machine active control ring 5 and a virtual synchronous machine reactive control ring 7, wherein U is as follows dc Is a capacitor C dc The voltage of the direct current capacitor at the two ends,is a direct-current voltage reference value, V d Is a capacitor C d Voltage at two ends omega 0 Is the fundamental wave angular frequency of the power grid voltage, D p And D q For droop factor, Q is output reactive power, Q ref To output reactive power reference value u c For mains voltage>For the grid voltage reference value, J is virtual inertia, K is gain of the integral controller, the content of the virtual synchronous machine voltage control link 2 is related to the prior art, and is not described in detail herein, the virtual synchronous machine voltage control link 2 is merely for convenience of describing the technical scheme of the present application.
Further, the input signal of the inertial support controller 2 is the droop coefficient D in the virtual synchronous machine active control loop 5 p Frequency modulated power signal P output by a feedback branch D And a feedback signal P of the virtual synchronous machine active control loop 5 out Output is a power command feedforward signal P ff 。
Further, the transfer function of the high-pass filter 8 satisfies the following relationship:
wherein G is out Representing the transfer function of the high pass filter 8, s being the Lawster transform operator, k out Is the gain coefficient omega of the high-pass filter 8 hp Is the cut-off angular frequency of the high pass filter 8.
S3, adding an instruction controller in the DC/DC power control link.
Specifically, in this embodiment, the command controller is located at the charge/discharge power command of the DC/DC power control section 1,i is the charge-discharge power instruction, i of the DC/DC power control link 1 0 The charge-discharge power command is the direct current bus current and is added with the power command feedforward signal after passing through the command controller.
Further, the command controller 3 is a low-pass filter, and the transfer function of the command controller 3 satisfies the following relationship:
G ref representing the transfer function, ω, of the command controller 3 p Is the cut-off angular frequency of the command controller 3.
And S4, controlling cascade power conversion of the inertia support type bidirectional charging pile by utilizing the inertia support controller and the instruction controller.
Specifically, in this embodiment, controlling the cascade power conversion of the inertia support type bidirectional charging pile by using the inertia support controller 2 and the command controller 3 includes realizing a grid inertia support function of the inertia support type bidirectional charging pile and realizing a function of the inertia support type bidirectional charging pile to participate in frequency modulation.
Further, the virtual synchronous machine active control loop 5 is controlled by a droop coefficient D p Frequency modulated power signal P output by a feedback branch D And a feedback signal P of the virtual synchronous machine active control loop 5 out The output is input to inertial support controller 2 as a feed forward component to generate a power command feed forward signal to DC/DC.Therefore, when the power grid frequency of the virtual synchronous machine is temporarily reduced, the inertia supporting power instantaneously output by the virtual synchronous machine can be immediately fed forward to a power instruction of the DC/DC, and then the DC/DC is used for quickly following the power change, so that the instantaneous power required by the inertia supporting is instantaneously balanced, and the moment that the inertia supporting type bidirectional charging pile supports the inertia of the power grid is prevented, and the DC capacitor voltage is greatly dropped. Next, from the transient of longer time scale up to steady state, the frequency modulated power signal P D The power command is also fed forward to the DC/DC, so that the power on one side of the DC/DC and the power of the virtual synchronous machine, which participates in the frequency modulation of the power grid, are kept balanced, and the phenomenon that the frequency modulation power of the virtual synchronous machine is counteracted by the voltage outer ring of the direct-current capacitor in order to balance the power on two sides is avoided.
More specifically, the feedback signal P out For the output active power of the virtual synchronous machine, the feedback signal P is fed back out The high-pass filter 8 is used for enabling the power command of the DC/DC to instantly acquire and output active power to change along with the power command when the frequency of the power grid suddenly changes, so as to avoid the rapid drop of the voltage of the direct-current capacitor at the direct-current side; at the same time, the high-pass filter 8 shows an open circuit state under the steady state condition, which means that the active power is output by the charging and discharging power of the electric automobile and the frequency modulation power signal P D And the decision is beneficial to ensuring that the inertia supporting type bidirectional charging pile can participate in primary frequency modulation of the power system.
Further, the feedback signal P out After passing through the high-pass filter 8, the signal is connected with a frequency modulation power signal P D Adding to obtain a power command feedforward signal P ff The virtual synchronous machine system can be shared by droop coefficient D when the power grid frequency deviates p The determined power is input to a power command of the DC/DC as a part of the feedforward power command, so that the inertia supporting type bidirectional charging pile can participate in primary frequency modulation of the power system.
Furthermore, the instruction controller 3 can adjust the slope of the charging and discharging power of the electric vehicle, reduce the change of the charging and discharging power instruction, further reduce the impact of the charging side power transient of the inertia support type bidirectional charging pile on the direct current capacitor voltage, be beneficial to improving the suppression effect on the direct current capacitor voltage dropping greatly, and prevent direct currentThe capacitance voltage collapses, and the omega can be regulated p The following speed of DC/DC charging and discharging power and fluctuation condition of direct current capacitor voltage when the command suddenly changes are weighed, the oscillation of direct current side capacitor power is restrained, the active power is output by a network side virtual synchronous machine which dynamically follows transient state and steady state of DC/DC charging and discharging power, and the power grid inertia supporting function and the frequency modulation participating function of the inertia supporting type bidirectional charging pile are realized.
The superiority and feasibility of the corresponding scheme of the application will be described below in connection with specific test results.
Specifically, in the present embodiment, the VSG is a virtual synchronous machine, and the initial state is when the electric vehicle is charged by 10kW, and the direction and sign of the power are negative. See fig. 4 and 5 when the grid frequency drops by 0.1Hz and when the subsequent charging power suddenly increases by 10 kW. The traditional scheme is the existing inertia supporting type bidirectional charging pile control method, and the patent corresponding scheme is the method provided by the application, namely the amplitude of the direct-current side voltage is the amplitude of the direct-current capacitor voltage. In fig. 4, the voltage drop of the dc capacitor at the dc side of the conventional scheme is serious, and if the actual operation is performed, the protection is already turned off; the net side VSG of the inertia support type bidirectional charging pile in fig. 5 is correspondingly observed to output active power, and it can be seen that the net side VSG of the conventional scheme has an initial peak of the active power, namely, the initial inertia support power and steady-state frequency modulation power exist, but the initial peak is quickly counteracted by the command of the direct-current voltage outer ring 6, and finally returns to the original 10kW charging power, so that the direct-current capacitor voltage returns to the rated value again after severely dropping, and oscillation power existing in the process also causes oscillation of the direct-current side capacitor power, so that the inertia support type bidirectional charging pile cannot provide the inertia support power of the power grid, and the power grid inertia support function of the inertia support type bidirectional charging pile cannot be realized.
Further, referring to fig. 4 and 5, the method provided by the application substantially suppresses the drop of the dc capacitor voltage, and keeps the dc capacitor voltage stable; oscillations of the net side VSG output active power corresponding to that observed in fig. 5 are eliminated and the initial inertia support power and steady-state frequency modulated power are also avoided from being offset by the command of the dc voltage outer loop 6. Note that the inertia support power in fig. 5 is positive when the grid frequency drops, so that the original grid side VSG output active power is increased from the initial-10 kW; it is also understood that inertia support is achieved for the grid output forward power on the same charging negative power basis. If the grid frequency drops more, or the droop coefficient is larger, the output power will become positive.
Further, please refer to fig. 6 when the grid frequency drops by 0.1Hz and when the subsequent charging power suddenly increases by 10 kW. The electric automobile charging and discharging power, namely DC/DC charging and discharging power, can be seen that the DC/DC charging and discharging power is kept unchanged in the initial transient state, the subsequent transient state and the steady state of the traditional scheme, so that the inertia support type bidirectional charging pile can not provide inertia support power and participate in primary frequency modulation of a power system; after the application is used, the DC/DC charge-discharge power dynamically follows the transient state and steady state network side VSG to output active power, so that the inertia support type bidirectional charge pile can provide power grid inertia support and participate in primary frequency modulation of a power system, and the function of the inertia support type bidirectional charge pile for participating in frequency modulation is realized.
From transient inertia support to transient state with longer time scale until steady state, the application feeds forward the power command of DC/DC, so that DC/DC charge-discharge power on one side of DC/DC and grid-side VSG output active power on one side of virtual synchronous machine are always balanced, on one hand, serious drop of DC capacitor voltage in the traditional scheme is restrained, and meanwhile, the problem that the inertia support power and frequency modulation power of the virtual synchronous machine are offset by a DC capacitor voltage outer ring in the traditional scheme for balancing the power on one side of DC/DC and one side of virtual synchronous machine is avoided, and further, the limitation of the existing inertia support type bidirectional charging pile control method is solved, thereby truly realizing the power grid inertia support function and the frequency modulation participation function of the inertia support type bidirectional charging pile.
It should be noted that, in some cases, the actions described in the specification may be performed in a different order and still achieve desirable results, and in this embodiment, the order of steps is merely provided to make the embodiment more clear, and it is convenient to describe the embodiment without limiting it.
In summary, the application uses the droop coefficient D in the virtual synchronous machine active control loop p Frequency modulated power signal P output by a feedback branch D And a feedback signal P of the virtual synchronous machine active control loop out The signal is led out, and the power instruction of the DC/DC is fed forward through the inertial support controller provided by the application to instantaneously supplement the deficiency of the instantaneous power of the inertial support, and the direct-current capacitor voltage is kept stable by combining the instruction controller, so that the power grid inertial support function of the inertial support type bidirectional charging pile is realized. Meanwhile, the feedforward power instruction brought by the inertial support controller also comprises frequency modulation power generated according to the D sag curve, so that in the subsequent process of the power grid frequency sag, the power on one side of the DC/DC (direct current/direct current) comprises the frequency modulation power besides the charging power, the power balance between the virtual synchronous machine voltage control link and the DC/DC power control link is ensured, and then the direct current voltage control outer ring does not generate an additional power instruction to offset the frequency modulation power of the virtual synchronous machine, so that the function of participating in frequency modulation of the inertial support type bidirectional charging pile is ensured. Therefore, the application solves the problems that the inertia support function of the electric network of the inertia support type bidirectional charging pile and the function of participating in frequency modulation can be realized in the prior art, but the corresponding function can not be realized in the actual operation process, and is beneficial to the further popularization of the interaction of the vehicle network of the inertia support type bidirectional charging pile.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (1)
1. The control method for cascade power conversion of the inertia supporting type bidirectional charging pile is characterized by comprising the following steps of:
acquiring a typical control frame of an inertia supporting type bidirectional charging pile;
adding an inertial support controller in a DC/DC power control link of the typical control framework, wherein an input signal of the inertial support controller comprises a frequency modulation power signal output by a feedback branch consisting of droop coefficients in an active control loop of a virtual synchronous machine, the input signal of the inertial support controller also comprises a feedback signal of the active control loop of the virtual synchronous machine, an output signal of the inertial support controller is a power instruction feedforward signal, the inertial support controller comprises a high-pass filter, the feedback signal passes through the high-pass filter and then is added with the frequency modulation power signal to obtain the power instruction feedforward signal, and a transfer function of the high-pass filter meets the following relation:
wherein G is out Representing the transfer function of the high pass filter, s being the Lawster transform operator, k out For the gain factor, ω, of the high pass filter hp A cut-off angular frequency for the high pass filter;
adding an instruction controller in the DC/DC power control link, wherein the instruction controller is positioned at a charge-discharge power instruction position of the DC/DC power control link, the charge-discharge power instruction is added with the power instruction feedforward signal after passing through the instruction controller, the instruction controller is a low-pass filter, and the transfer function of the instruction controller meets the following relation:
wherein G is ref Representing the transfer function of the instruction controller, s being the Lawster transform operator, ω p A cut-off angular frequency for the command controller;
and controlling cascade power conversion of the inertia support type bidirectional charging pile by utilizing the inertia support controller and the instruction controller.
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