CN113991673B - Multi-port common high frequency electric energy router control method and system - Google Patents
Multi-port common high frequency electric energy router control method and system 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The embodiment of the application discloses a control method and a control system for a multi-port common high-frequency electric energy router, wherein the method comprises the following steps: establishing a mathematical model of the multi-port common high-frequency electric energy router to determine a target decoupling link; according to the components of d and q axes of a target decoupling link, setting a voltage stabilizing component as a q axis and setting a reactive component as a d axis so as to realize the control of a double closed loop outer ring; decoupling control method under SVPWM modulation mode, and modulation signal V thereof abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain; will modulate signal V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator. The function of controlling the power exchange between the power grid and the router system is realized, and the harmonic wave injected into the power grid by the router can be restrained.
Description
Technical Field
The embodiment of the application relates to the technical field of electric energy routers, in particular to a multi-port common high-frequency electric energy router control method and system.
Background
Along with the continuous deterioration of ecological environment and the increasing tension of energy supply and demand, renewable energy is greatly developed, the clean low-carbon transformation development of propulsion energy is accelerated, and the method has gradually become the subject of energy development worldwide at present. The traditional power system can not cope with the challenges of unstable output, harmonic injection and the like caused by high-proportion new energy and high-proportion power electronic equipment. The common high-frequency alternating current bus electric energy router based on the power electronic device is used as a core device for connecting an alternating current and direct current power grid, not only can flexible and various interface forms be provided for multi-source load interaction scenes, but also the functions of actively controlling the multidirectional flow of energy and managing the energy flow can be realized.
The application of the large-scale power electronic device introduces uncertainty harmonic current in high frequency and wide frequency domain, when the stator voltage and current of the generator contain harmonic components, the stator can output active power and reactive power to generate pulsation, the complex problems of oscillation, instantaneous harmonic interaction, voltage flicker and the like of the generator set and the power grid are easily induced, and the set is separated when serious, so that the safe and stable operation of the power grid is influenced. The internal harmonics of the power router system have a number of influencing factors including high-side rectification harmonics, power electronics modulation, line parameter resonance, etc. The harmonic output characteristics of the electric energy router can be accurately grasped, a foundation can be laid for controlling the electric energy output by the router system to meet grid-connected standards, the internal harmonic generation and propagation mechanism of the router can be accurately researched, the operation loss at the high-frequency transformer can be restrained, and the stability and economy of the system are improved.
The scholars at home and abroad have a certain research on the strategy of controlling the electric energy router, and most of the research is focused on how to realize the power exchange between different ports of the router, and the research of harmonic wave management is lacking. For the power router, the high-side rectifying area is the part connected to the power grid, so that the choice of topology thereof affects the harmonic currents to the greatest extent. Different device structures and control strategies can also have specific influence on the characteristics of the harmonic wave, and meanwhile, when a port of a router fails or the running state is unstable, the router can have unknown influence on the harmonic wave injected into a power grid, so that the router harmonic wave mechanism under the dynamic running is measured, and the stable running of a router system under the dynamic change of the multi-element source load is realized.
Disclosure of Invention
Therefore, in the control method and system for the multi-port common high-frequency electric energy router provided by the embodiment of the application, the harmonic suppression method for the common high-frequency alternating current bus electric energy router based on dual phase shift control under multi-element source load is provided, and meanwhile, a dual closed loop decoupling power control strategy is established, so that the function of controlling power exchange between a power grid and a router system can be realized, and the harmonic injected into the power grid by the router can be suppressed.
The method solves the problems of router faults and the like under the condition of harmonic injection and dynamic operation.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
according to a first aspect of an embodiment of the present application, there is provided a method for controlling a multi-port co-high frequency power router, the method including:
establishing a mathematical model of the multi-port common high-frequency electric energy router to determine a target decoupling link;
according to the components of d and q axes of a target decoupling link, setting a voltage stabilizing component as a q axis and setting a reactive component as a d axis so as to realize the control of a double closed loop outer ring;
decoupling control method under SVPWM modulation mode, and modulation signal V thereof abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain;
will modulate signal V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator.
Optionally, the establishing a mathematical model of the multiport common high frequency electric energy router to determine the target decoupling link is performed according to the following formula:
wherein L is 1 、C 1 The inductance and capacitance values are the inductance and capacitance values of the network side; i.e 1 I is the inductance current near the grid-connected point 1d 、i 1q D for its coordinate transformation A q-axis component; i.e l1 For inductor current near the converter, i l1d 、i l1q D, q-axis components transformed for their coordinates; u (u) c For the capacitance voltage, u cd 、u cq D, q-axis components transformed for their coordinates; u (u) l For the inductance voltage, u ld 、u lq D, q-axis components for their coordinate transformation.
Optionally, according to the d-axis and q-axis components of the target decoupling link, the voltage stabilizing component is given as the q-axis, and the reactive component is given as the d-axis, so as to realize the control of the double closed-loop outer loop, and the following formula is adopted:
wherein i is dPI Is a control signal which is fed back and then is output by the regulator; i.e q The q-axis component is obtained after the actual current value coordinate transformation; u (U) dc 、U dc * Is the actual value and the given value of the direct current voltage; k (K) i 、K p Is a regulator parameter; for a given d-axis current value, the following formula is adopted:
Q＝i d *ω*L eq
wherein L is eq For equivalent rotor inductance, Q is the reactive power consumed by a given system, ω is the angular velocity with reference to the network side signal, i d * A given amount for the d-axis; the q-axis current given value is selected as a feedback value of the direct-current side voltage, and the d-axis current given value is determined by the reactive component of the control.
Optionally, the modulation signal coordinate transformation value V during the decoupling control α ，V β The calculation formula is as follows:
wherein u is d 、u q D, q-axis components transformed for actual voltage value coordinates; i.e d 、i q D, q-axis components transformed for actual current value coordinates; i.e dPI 、i qPI A component output by the regulator for the control system; omega is the angular frequency of the modulated signal; l (L) llc Is the inductance of the filtering system.
Optionally, the modulation signal V abc Comparing with the target sine waveform to obtain a modulation signal f m According to the following formula:
wherein f m For modulating signals, U abc As an ideal voltage signal, U ref K being the amplitude of the voltage signal i Is the regulator parameter.
Optionally, the method further comprises the following steps:
dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and respectively establishing discrete models for the links;
the discrete model established by coordination control determines corresponding control strategies respectively aiming at a load link, a power supply link and a high-frequency transformer link;
establishing a distributed energy source and an energy storage system electric appliance model: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback steady-current inductor to form a double closed-loop control strategy;
The net side frame structure is added into the filtering system.
Optionally, the method further comprises the following steps:
partitioning a multiport common high-frequency alternating-current bus electric energy router system according to the topological structure and the position of an electric and electronic device;
different control strategies are established for the power electronic converters in different areas;
when the system runs stably, a detection system is established, and a control strategy of the detection system judges whether the system has faults or not within repeated interruption time; when the detector judges that the system fails, all power ports and failure ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized;
establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates; if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, an alarm is sent to the monitoring system, and whether the operation is stopped or not is judged to be subjected to system level correction.
According to a second aspect of an embodiment of the present application, there is provided a multi-port co-high frequency power router control system, the system comprising:
the decoupling module is used for establishing a mathematical model of the multi-port common high-frequency electric energy router so as to determine a target decoupling link;
the double closed loop outer loop control module is used for giving a voltage stabilizing component as a q axis and a reactive component as a d axis according to the components of d and q axes of a target decoupling link so as to realize the control of the double closed loop outer loop;
the SVPWM modulation module is used for establishing a decoupling control method under the SVPWM modulation mode, and modulating a signal V abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain;
a modulation signal module for modulating the signal V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator.
Optionally, in the decoupling module, a mathematical model is established to determine a target decoupling link, which is performed according to the following formula:
wherein L is 1 、C 1 The inductance and capacitance values are the inductance and capacitance values of the network side; i.e 1 I is the inductance current near the grid-connected point 1d 、i 1q D, q-axis components transformed for their coordinates; i.e l1 For inductor current near the converter, i l1d 、i l1q D, q-axis components transformed for their coordinates; u (u) c For the capacitance voltage, u cd 、u cq D, q-axis components transformed for their coordinates; u (u) l For the inductance voltage, u ld 、u lq D, q-axis components for their coordinate transformation.
Optionally, the dual closed loop outer loop control module sets a voltage stabilizing component as a q axis and a reactive component as a d axis according to components of d and q axes of a target decoupling link, so as to realize control of the dual closed loop outer loop, and the method comprises the following steps:
wherein i is dPI Is a control signal which is fed back and then is output by the regulator; i.e q The q-axis component is obtained after the actual current value coordinate transformation; u (U) dc 、U dc * Is the actual value and the given value of the direct current voltage; k (K) i 、K p For adjusting parameters of the regulatorThe method comprises the steps of carrying out a first treatment on the surface of the For a given d-axis current value, the following formula is adopted:
Q＝i d *ω*L eq
wherein L is eq Q is the reactive power consumed by a given system, which is the equivalent rotor inductance; the q-axis current given value is selected as a feedback value of the direct-current side voltage, and the d-axis current given value is determined by the reactive component of the control.
Optionally, the SVPWM module decouples the modulation signal coordinate transformation value V in the control process α ，V β The calculation formula is as follows:
wherein u is d 、u q D, q-axis components transformed for actual voltage value coordinates; i.e d 、i q D, q-axis components transformed for actual current value coordinates; i.e dPI 、i qPI A component output by the regulator for the control system; omega is the angular frequency of the modulated signal; l (L) llc Is the inductance of the filtering system.
Optionally, a modulating signal module modulates the signal V abc Comparing with the target sine waveform to obtain a modulation signal f m According to the following formula:
wherein f m For modulating signals, U abc As an ideal voltage signal, U ref K being the amplitude of the voltage signal i Is the regulator parameter.
Optionally, the system further comprises: the system dynamic model building module is specifically used for:
dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and respectively establishing discrete models for the links;
the discrete model established by coordination control determines corresponding control strategies respectively aiming at a load link, a power supply link and a high-frequency transformer link;
establishing a distributed energy source and an energy storage system electric appliance model: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback steady-current inductor to form a double closed-loop control strategy;
The net side frame structure is added into the filtering system.
Optionally, the system further comprises: the switching control mechanism module is specifically used for:
partitioning a multiport common high-frequency alternating-current bus electric energy router system according to the topological structure and the position of an electric and electronic device;
different control strategies are established for the power electronic converters in different areas;
when the system runs stably, a detection system is established, and a control strategy of the detection system judges whether the system has faults or not within repeated interruption time; when the detector judges that the system fails, all power ports and failure ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized;
establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates; if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, an alarm is sent to the monitoring system, and whether the operation is stopped or not is judged to be subjected to system level correction.
According to a third aspect of embodiments of the present application, there is provided an apparatus comprising: the device comprises a data acquisition device, a processor and a memory; the data acquisition device is used for acquiring data; the memory is used for storing one or more program instructions; the processor is configured to execute one or more program instructions to perform the method of any of the first aspects.
According to a fourth aspect of embodiments of the present application, there is provided a computer readable storage medium having embodied therein one or more program instructions for performing the method of any of the first aspects.
In summary, in the method and the system for controlling the multi-port common high frequency electric energy router provided by the embodiment of the application, a mathematical model of the multi-port common high frequency electric energy router is established to determine a target decoupling link; according to the components of d and q axes of a target decoupling link, setting a voltage stabilizing component as a q axis and setting a reactive component as a d axis so as to realize the control of a double closed loop outer ring; decoupling control method under SVPWM modulation mode, and modulation signal V thereof abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain; will modulate signal V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator. The function of controlling the power exchange between the power grid and the router system is realized, and the harmonic wave injected into the power grid by the router can be restrained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the scope of the invention.
Fig. 1 is a schematic flow chart of a control method of a multi-port common high frequency electric energy router according to an embodiment of the present application;
FIG. 2 is a conceptual flow chart of a model provided in an embodiment of the present application;
FIG. 3 is an overall frame diagram of a model provided by an embodiment of the present application;
FIG. 4a is a schematic diagram of a distributed router energy topology according to an embodiment of the present application;
FIG. 4b is a topology of an energy storage system according to an embodiment of the present application;
FIG. 5a is a block diagram of a dual closed loop decoupling control strategy according to an embodiment of the present application;
FIG. 5b is a block diagram of a dual phase shift control strategy according to an embodiment of the present application;
fig. 6a is a harmonic analysis diagram of an injection system of a common high-frequency ac bus power router system operating under a common control strategy working condition under a multi-source load interaction scene provided by an embodiment of the present application;
fig. 6b is a harmonic analysis diagram of an injection system of the common high frequency ac bus power router system operating under a double closed loop decoupling control strategy condition under a multi-source load interaction scenario provided by the embodiment of the present application;
FIG. 7 is a schematic diagram of a dynamic policy switching control mechanism for a multiport electrical router system according to an embodiment of the present application;
FIG. 8a is a single-phase AC current diagram of an embodiment of the present application under dynamic control mechanism operation;
FIG. 8b is a schematic diagram illustrating harmonic analysis of DC port current under operation of a dynamic control mechanism according to an embodiment of the present application;
fig. 9 is a schematic diagram of harmonic analysis for a dc port voltage link according to an embodiment of the present application;
FIG. 10 is a simulation result of a stable operation achieved again through a port dynamic policy switching control mechanism when a common high frequency electric energy router system fails;
fig. 11 is a block diagram of a control system of a multiport common high frequency power router according to an embodiment of the present application.
Detailed Description
Other advantages and advantages of the present application will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 shows a schematic flow chart of a control method of a multiport common high frequency power router, the method includes:
step 101: establishing a mathematical model of the multi-port common high-frequency electric energy router to determine a target decoupling link;
Step 102: according to the components of d and q axes of a target decoupling link, setting a voltage stabilizing component as a q axis and setting a reactive component as a d axis so as to realize the control of a double closed loop outer ring;
step 103: decoupling control method under SVPWM modulation mode, and modulation signal V thereof abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain;
step 104: will modulate signal V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator.
In one possible implementation manner, the establishing a mathematical model of the multi-port common high frequency power router to determine the target decoupling link is performed according to the following formula set (1):
wherein L is 1 、C 1 The inductance and capacitance values are the inductance and capacitance values of the network side; i.e 1 I is the inductance current near the grid-connected point 1d 、i 1q D, q-axis components transformed for their coordinates; i.e l1 For inductor current near the converter, i l1d 、i l1q D, q-axis components transformed for their coordinates; u (u) c For the capacitance voltage, u cd 、u cq D, q-axis components transformed for their coordinates; u (u) l For the inductance voltage, u ld 、u lq D, q-axis components for their coordinate transformation.
In one possible implementation, according to the d, q axis components of the target decoupling link, the voltage stabilizing component is given as q axis, and the reactive component is given as d axis, so as to realize the control of the double closed-loop outer loop, according to the following formula (2):
Wherein i is dPI Is a control signal which is fed back and then is output by the regulator; i.e q The q-axis component is obtained after the actual current value coordinate transformation; u (U) dc 、U dc * Is the actual value and the given value of the direct current voltage; k (K) i 、K p Is a regulator parameter; for a given d-axis current value, the following formula (3) is adopted:
Q＝i d *ω*L eq formula (3)
Wherein L is eq Q is the reactive power consumed by a given system, which is the equivalent rotor inductance; the q-axis current given value is selected as a feedback value of the direct-current side voltage, and the d-axis current given value is determined by the reactive component of the control.
In one possible embodiment, the modulation signal coordinate transformation value V during the decoupling control process α ，V β The calculation formula is shown in the following formula groups (4) and (5):
wherein u is d 、u q D, q-axis components transformed for actual voltage value coordinates; i.e d 、i q D, q-axis components transformed for actual current value coordinates; i.e dPI 、i qPI A component output by the regulator for the control system; omega is the angular frequency of the modulated signal; l (L) llc Is the inductance of the filtering system.
In one possible embodiment, the signal V will be modulated abc Comparing with the target sine waveform to obtain a modulation signal f m According to the following formula (6):
wherein f m For modulating signals, U abc As an ideal voltage signal, U ref K being the amplitude of the voltage signal i Is the regulator parameter.
In one possible embodiment, the method further comprises the steps of: the method for establishing the system dynamic model of the multiport common high frequency electric energy router comprises the following steps:
dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and respectively establishing discrete models for the links;
the discrete model established by coordination control determines corresponding control strategies respectively aiming at a load link, a power supply link and a high-frequency transformer link;
establishing a distributed energy source and an energy storage system electric appliance model: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback steady-current inductor to form a double closed-loop control strategy;
the net side frame structure is added into the filtering system.
In one possible embodiment, the method further comprises the steps of: the method for establishing the dynamic strategy switching control mechanism of the multiport common high-frequency electric energy router system comprises the following steps:
partitioning a multiport common high-frequency alternating-current bus electric energy router system according to the topological structure and the position of an electric and electronic device;
Different control strategies are established for the power electronic converters in different areas;
when the system runs stably, a detection system is established, and a control strategy of the detection system judges whether the system has faults or not within repeated interruption time; when the detector judges that the system fails, all power ports and failure ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized;
establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates; if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, an alarm is sent to the monitoring system, and whether the operation is stopped or not is judged to be subjected to system level correction.
Embodiments of the present application are further described below with reference to the drawings and model simulations. FIG. 2 is a conceptual flow chart of a model provided in an embodiment of the present application; FIG. 3 is an overall frame diagram of a model provided by an embodiment of the present application; the method for establishing the dynamic model of the multiport common high frequency electric energy router system comprises the following detailed steps:
S1: dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and performing discrete modeling aiming at each link respectively;
s2: and (3) coordinating discrete models established by control, and respectively formulating corresponding control strategies for a load link, a power supply link and a high-frequency transformer link. Controlling the operation of a converter at the network side of the high-frequency transformer by adopting a double phase shifting strategy or an open loop strategy;
s3: establishing a distributed energy source and an energy storage system electrical appliance topology: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of the negative feedback steady-current inductor to form a double closed-loop control strategy.
S4: the network side frame is added into a filtering system, and a double closed loop decoupling control strategy is established aiming at the topological structure of the filtering system to inhibit the router system from injecting harmonic current components of the power grid.
The embodiment of the application adopts a partition dynamic management and control mechanism to realize the stable and dynamic operation of the multi-port electric energy router, not only can restrain the harmonic component of an injection system under the abnormal operation condition of the router, but also can be used for analyzing the change characteristics of the internal harmonic of the whole electric energy router system under the dynamic change condition, and the model of the embodiment can realize the aims of accurately monitoring, evaluating and effectively restraining the non-fundamental wave signals of the multi-port common high frequency electric energy router system.
FIG. 4a is a schematic diagram of a distributed router energy topology according to an embodiment of the present application; FIG. 4b is a topology of an energy storage system according to an embodiment of the present application; FIG. 5a is a block diagram of a dual closed loop decoupling control strategy according to an embodiment of the present application; fig. 5b is a block diagram of a dual phase shift control strategy according to an embodiment of the present application. The control method of the multiport common high frequency electric energy router provided by the embodiment of the application not only can realize the function of controlling the power exchange between the power grid and the router system, but also can restrain the harmonic waves injected into the power grid by the router, and comprises the following steps:
s1: aiming at a control strategy of the grid-connected three-phase rectifier, firstly, determining a link needing decoupling through establishment and deduction of a mathematical model;
s2: taking the components of d and q axes required by a decoupling formula into consideration, giving a voltage stabilizing component as the q axis and giving a reactive component as the d axis, so as to realize the control of the double closed loop outer ring;
s3: in order to reduce the lower harmonic component caused by the modulation mode, SVPWM modulation mode is adopted, which modulates the signal V abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain;
s4: to ensure the AC stability of the network side voltage and reduce the distortion rate, the converted voltage value is compared with an ideal sine waveform to obtain a modulation signal f m The switching signal can be obtained by modulating the signal generator.
First, a dual closed loop decoupling control strategy is established: and (3) establishing a mathematical model to carry out coordinate transformation decoupling by considering the influence of the network side filter on the signal value after the current coordinate transformation, wherein a decoupling formula is shown as formula group (1).
And (3) controlling d and q axis components after coordinate transformation, namely controlling the power value exchanged by the network side converter and the power grid, and improving a data model:
(1) The influence of the capacitance value in the filtering system on the voltage is not great, so that the capacitive coupling can be omitted for simplification during decoupling;
(2) And for the q-axis current given value, the feedback value of the direct-current side voltage can be selected to stabilize the effect of outputting the direct-current voltage. The q-axis current given value can be selected as a feedback value of the direct-current side voltage, and the d-axis current given value can be determined by the reactive component of the control according to the formula (2).
(3) For a given d-axis current value, q=i d *ω*L eq ，L eq Q gives the reactive power consumed by the system for an equivalent rotor inductance.
In order to reduce harmonic signals generated by the modulation of a conversion device, a decoupling control strategy under SVPWM modulation is established, and a coordinate conversion value V of a modulation signal in the decoupling control process is converted α ，V β The calculations are according to the formula sets (4) and (5).
Transforming the coordinates of the formula to obtain transformed V abc Voltage value, in order to ensure the AC stability of the network side voltage and reduce the distortion rate, the converted voltage value is compared with ideal sine waveform to obtain a modulation signal, as shown in formula (6)。
The analysis graphs of the harmonic waves of the double closed-loop decoupling control strategy and the common closed-loop control strategy are shown in fig. 6a and 6b, respectively, and it can be seen that the harmonic component and the amplitude can be effectively restrained in the double closed-loop decoupling control strategy. The total harmonic content (THD) is reduced while the fundamental wave amplitude is reduced, so that the control strategy is effective and the expected effect can be achieved.
FIG. 7 is a flow chart of a dynamic policy switching control mechanism and a corresponding multiple control block diagram of different areas according to an embodiment of the present application; the method for establishing the dynamic policy switching control mechanism of the multiport common high frequency electric energy router system can be as follows:
s1: dividing a multiport common high-frequency alternating-current bus electric energy router system into regions according to topological structures and positions of electric and electronic devices, wherein the multiport common high-frequency alternating-current bus electric energy router system can be divided into a network side region, a high-frequency region and a load region, and three ports can be divided into the network side region, the high-frequency region, the load region, an energy storage region and the like;
S2: for the power electronic converter in different areas, various different control strategies are established, such as a network side area can be established with a double closed loop decoupling control strategy, active power flow control, single closed loop voltage control and the like, a high frequency area is established with a phase shift control, an open loop control and the like, a load area is established with a voltage closed loop control, a current closed loop control and the like, and an energy storage area is established with a constant voltage charge, a constant current charge, a hybrid charge and the like;
s3: when different control strategies are guaranteed to coordinate control, the multiport router system can stably operate. When the system runs stably, a detection system is established, and the control strategy of the detection system judges whether the system has faults or not within repeated interruption time.
S4: when the detector judges that the system fails, all power ports and failure ports are disconnected at the first time, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; and if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized.
S5: and (3) establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates. If the variables such as voltage amplitude, current amplitude, phase angle and the like are out of line, an alarm is sent to the monitoring system at the first time, and whether the operation is stopped or not is judged to be subjected to system level correction.
Fig. 8a shows a single-phase ac current diagram of an embodiment of the present application under the operation of the dynamic control mechanism, fig. 8b shows a harmonic analysis of dc port current under the operation of the dynamic control mechanism, and fig. 9 shows a harmonic analysis for dc port voltage links provided by the embodiment of the present application; it can be seen that its high frequency harmonics originate mainly from the high frequency carrier signal of the converter.
Fig. 10 is a schematic diagram of a simulation result of a stable operation achieved again by a port dynamic policy switching management and control mechanism when a co-high frequency electric energy router system fails, a system port load is broken when the dynamic management and control mechanism fails under the condition of strain when the dynamic management and control mechanism fails, and the current is suddenly dropped to zero at the moment when the system port load is broken for 1.25s, but another load port is not affected under the control of the dynamic management and control mechanism, so that the normal operation can be continued; at 1.9s, the control mechanism detection port can be put into operation again, and the current is restored to the normal level.
The method and the device can not only restrain harmonic components of an injection system under the abnormal operation condition of the router, but also be used for analyzing the change characteristics of internal harmonic waves of the whole electric energy router system under the dynamic change condition, and can realize the purposes of accurately monitoring, evaluating and effectively restraining non-fundamental wave signals of the multi-port common high-frequency electric energy router system through the model of the embodiment.
It can be seen that the embodiment of the application establishes the common high-frequency alternating current bus electric energy router model based on dual phase shift control under the multi-element source load interaction scene, is suitable for harmonic analysis of a system under the condition of steady-state operation, can be used for measuring the system harmonic change under different working condition changes and under the condition of system faults, and achieves the purposes of accurately monitoring, evaluating and dynamically analyzing the harmonic. The limitation that the existing router cannot restrain the current of the injected power grid harmonic is broken through by establishing a double closed loop decoupling control strategy, and the provided switching strategy control mode can realize stable operation of the router under a multi-source load dynamic change scene and when sudden faults occur, and can realize analysis of a system harmonic spectrum under the condition that the router system works normally.
In summary, the embodiment of the application provides a control method of a multi-port common high frequency electric energy router, which establishes a mathematical model of the multi-port common high frequency electric energy router to determine a target decoupling link; according to the components of d and q axes of a target decoupling link, setting a voltage stabilizing component as a q axis and setting a reactive component as a d axis so as to realize the control of a double closed loop outer ring; establishing a decoupling control method under an SVPWM modulation mode to reduce harmonic signals generated by the modulation of a conversion device; modulated signal V thereof abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain; will change the voltage value V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator. The method for suppressing the harmonic waves of the common high-frequency alternating current bus electric energy router based on double phase shift control under the multi-element source load is provided, and meanwhile, a double closed loop decoupling power control strategy is established, so that the function of controlling the power exchange of the power grid and the router system can be realized, and the harmonic waves injected into the power grid by the router can be suppressed.
Based on the same technical concept, the embodiment of the application also provides a multi-port common high frequency electric energy router control system, as shown in fig. 11, the system comprises:
the decoupling module 1101 is configured to establish a mathematical model of the multi-port co-high frequency electric energy router to determine a target decoupling link;
the double closed loop outer loop control module 1102 is used for giving a voltage stabilizing component as a q axis and a reactive component as a d axis according to the components of d and q axes of a target decoupling link so as to realize the control of the double closed loop outer loop;
the SVPWM module 1103 is configured to establish a decoupling control method in an SVPWM mode, which modulates the signal V abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain;
a modulation signal module 1104 for modulating the signal V abc Comparing with the target sine waveform to obtain a modulation signal f m The switch signal of the multiport common high frequency electric energy router is obtained through a modulation signal generator.
In one possible implementation, the decoupling module 1101 builds a mathematical model to determine a target decoupling element, such as equation set (1).
In one possible implementation manner, the dual closed loop outer loop control module 1102 sets a voltage stabilizing component as a q axis and a reactive component as a d axis according to components of d and q axes of a target decoupling link, so as to realize control of the dual closed loop outer loop, and the method is according to a formula (2).
In a possible implementation manner, the SVPWM modulation module 1103 decouples the modulation signal coordinate transformation value V in the control process α ，V β According to the formula sets (4) and (5).
In one possible implementation, the modulation signal module 1104 modulates the transformed voltage value V abc Comparing with the target sine waveform to obtain a modulation signal f m As shown in equation (6).
In one possible embodiment, the system further comprises: the system dynamic model building module is specifically used for:
Dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and respectively establishing discrete models for the links;
the discrete model established by coordination control determines corresponding control strategies respectively aiming at a load link, a power supply link and a high-frequency transformer link;
establishing a distributed energy source and an energy storage system electric appliance model: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback steady-current inductor to form a double closed-loop control strategy;
the net side frame structure is added into the filtering system.
In one possible embodiment, the system further comprises: the switching control mechanism module is specifically used for:
partitioning a multiport common high-frequency alternating-current bus electric energy router system according to the topological structure and the position of an electric and electronic device;
different control strategies are established for the power electronic converters in different areas;
when the system runs stably, a detection system is established, and a control strategy of the detection system judges whether the system has faults or not within repeated interruption time; when the detector judges that the system fails, all power ports and failure ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized;
Establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates; if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, an alarm is sent to the monitoring system, and whether the operation is stopped or not is judged to be subjected to system level correction.
Based on the same technical concept, the embodiment of the application also provides equipment, which comprises: the device comprises a data acquisition device, a processor and a memory; the data acquisition device is used for acquiring data; the memory is used for storing one or more program instructions; the processor is configured to execute one or more program instructions to perform the method.
Based on the same technical concept, the embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium contains one or more program instructions, and the one or more program instructions are used for executing the method.
In the present specification, each embodiment of the method is described in a progressive manner, and identical and similar parts of each embodiment are referred to each other, and each embodiment mainly describes differences from other embodiments. For relevance, see the description of the method embodiments.
It should be noted that although the operations of the method of the present application are depicted in the drawings in a particular order, this does not require or imply that the operations be performed in that particular order or that all illustrated operations be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
Although the application provides method operational steps as an example or a flowchart, more or fewer operational steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an apparatus or client product in practice, the methods illustrated in the embodiments or figures may be performed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even in a distributed data processing environment). The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, it is not excluded that additional identical or equivalent elements may be present in a process, method, article, or apparatus that comprises a described element.
The units, devices or modules etc. set forth in the above embodiments may be implemented in particular by a computer chip or entity or by a product having a certain function. For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, when implementing the present application, the functions of each module may be implemented in the same or multiple pieces of software and/or hardware, or a module implementing the same function may be implemented by multiple sub-modules or a combination of sub-units. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller can be regarded as a hardware component, and means for implementing various functions included therein can also be regarded as a structure within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
From the above description of embodiments, it will be apparent to those skilled in the art that the present application may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
Various embodiments in this specification are described in a progressive manner, and identical or similar parts are all provided for each embodiment, each embodiment focusing on differences from other embodiments. The application is operational with numerous general purpose or special purpose computer system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (15)
1. A method for controlling a multi-port co-high frequency power router, the method comprising:
Establishing a mathematical model of the multi-port common high-frequency electric energy router to determine a target decoupling link;
according to the components of d and q axes of a target decoupling link, setting a voltage stabilizing component as a q axis and setting a reactive component as a d axis so as to realize the control of a double closed loop outer ring;
decoupling control method under SVPWM modulation mode, and modulation signal V thereof abc By a secondary decoupling formula and byV transformed by coordinates α 、V β Transforming to obtain;
will modulate signal V abc Comparing with the target sine waveform to obtain a modulation signal f m Obtaining a switch signal of the multiport common high frequency electric energy router through a modulation signal generator;
modulation signal coordinate transformation value V in decoupling control process α ，V β The calculation formula is as follows:
wherein u is d 、u q D, q-axis components transformed for actual voltage value coordinates; i.e d 、i q D, q-axis components transformed for actual current value coordinates; i.e dPI 、i qPI A component output by the regulator for the control system; omega is the angular frequency of the modulated signal; l (L) llc Is the inductance of the filtering system.
2. The method of claim 1, wherein the establishing a mathematical model of the multiport common high frequency power router to determine the target decoupling step is performed according to the following formula:
wherein L is 1 、C 1 The inductance and capacitance values are the inductance and capacitance values of the network side; i.e 1 I is the inductance current near the grid-connected point 1d 、i 1q D, q-axis components transformed for their coordinates; i.e l1 For inductor current near the converter, i l1d 、i l1q D, q-axis components transformed for their coordinates; u (u) c For the capacitance voltage, u cd 、u cq D, q-axis components transformed for their coordinates; u (u) l For the inductance voltage, u ld 、u lq D, q-axis components for their coordinate transformation.
3. The method of claim 1, wherein the voltage stabilizing component is given as q-axis and the reactive component is given as d-axis according to the d-axis and q-axis components of the target decoupling link to realize the control of the double closed-loop outer loop, according to the following formula:
wherein i is dPI Is a control signal which is fed back and then is output by the regulator; i.e q The q-axis component is obtained after the actual current value coordinate transformation; u (U) dc 、U dc * Is the actual value and the given value of the direct current voltage; k (K) i 、K p Is a regulator parameter; for a given d-axis current value, the following formula is adopted:
Q＝i d *ω*L eq
wherein L is eq For equivalent rotor inductance, Q is the reactive power consumed by a given system, ω is the angular velocity with reference to the network side signal, i d * A given amount for the d-axis; the q-axis current given value is selected as a feedback value of the direct-current side voltage, and the d-axis current given value is determined by the reactive component of the control.
4. The method according to claim 1, wherein the modulated signal V abc Comparing with the target sine waveform to obtain a modulation signal f m According to the following formula:
wherein f m For modulating signals, U abc As an ideal voltage signal, U ref K being the amplitude of the voltage signal i Is the regulator parameter.
5. The method of claim 1, further comprising the step of:
dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and respectively establishing discrete models for the links;
the discrete model established by coordination control determines corresponding control strategies respectively aiming at a load link, a power supply link and a high-frequency transformer link;
establishing a distributed energy source and an energy storage system electric appliance model: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback steady-current inductor to form a double closed-loop control strategy;
the net side frame structure is added into the filtering system.
6. The method of claim 1, further comprising the step of:
partitioning a multiport common high-frequency alternating-current bus electric energy router system according to the topological structure and the position of an electric and electronic device;
Different control strategies are established for the power electronic converters in different areas;
when the system runs stably, a detection system is established, and a control strategy of the detection system judges whether the system has faults or not within repeated interruption time; when the detector judges that the system fails, all power ports and failure ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized;
establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates; if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, an alarm is sent to the monitoring system, and whether the operation is stopped or not is judged to be subjected to system level correction.
7. A multi-port co-high frequency power router control system, the system comprising:
the decoupling module is used for establishing a mathematical model of the multi-port common high-frequency electric energy router so as to determine a target decoupling link;
The double closed loop outer loop control module is used for giving a voltage stabilizing component as a q axis and a reactive component as a d axis according to the components of d and q axes of a target decoupling link so as to realize the control of the double closed loop outer loop;
the SVPWM modulation module is used for establishing a decoupling control method under the SVPWM modulation mode, and modulating a signal V abc V obtained by a secondary decoupling formula and through coordinate transformation α 、V β Transforming to obtain;
a modulation signal module for modulating the signal V abc Comparing with the target sine waveform to obtain a modulation signal f m Obtaining a switch signal of the multiport common high frequency electric energy router through a modulation signal generator;
modulation signal coordinate transformation value V in decoupling control process α ，V β The calculation formula is as follows:
wherein u is d 、u q D, q-axis components transformed for actual voltage value coordinates; i.e d 、i q D, q-axis components transformed for actual current value coordinates; i.e dPI 、i qPI A component output by the regulator for the control system; omega is the angular frequency of the modulated signal; l (L) llc Is the inductance of the filtering system.
8. The system of claim 7, wherein the decoupling module establishes a mathematical model to determine the target decoupling element according to the following formula:
wherein L is 1 、C 1 The inductance and capacitance values are the inductance and capacitance values of the network side; i.e 1 I is the inductance current near the grid-connected point 1d 、i 1q D, q-axis components transformed for their coordinates; i.e l1 For inductor current near the converter, i l1d 、i l1q D, q-axis components transformed for their coordinates; u (u) c For the capacitance voltage, u cd 、u cq D, q-axis components transformed for their coordinates; u (u) l For the inductance voltage, u ld 、u lq D, q-axis components for their coordinate transformation.
9. The system of claim 7, wherein the dual closed loop outer loop control module, based on the d, q axis components of the target decoupling element, gives the regulated voltage component as the q axis and the reactive component as the d axis to achieve the dual closed loop outer loop control according to the following formula:
wherein i is dPI Is a control signal which is fed back and then is output by the regulator; i.e q The q-axis component is obtained after the actual current value coordinate transformation; u (U) dc 、U dc * Is the actual value and the given value of the direct current voltage; k (K) i 、K p Is a regulator parameter; for a given d-axis current value, the following formula is adopted:
Q＝i d *ω*L eq
wherein L is eq Q is the reactive power consumed by a given system, which is the equivalent rotor inductance; the q-axis current given value is selected as a feedback value of the direct-current side voltage, and the d-axis current given value is determined by the reactive component of the control.
10. The system of claim 7, wherein the SVPWM modulation module decouples the modulation signal coordinate transformation value V during control α ，V β The calculation formula is as follows:
wherein u is d 、u q D, q-axis components transformed for actual voltage value coordinates; i.e d 、i q D, q-axis components transformed for actual current value coordinates; i.e dPI 、i qPI A component output by the regulator for the control system; omega is the angular frequency of the modulated signal; l (L) llc Is the inductance of the filtering system.
11. The system of claim 7, wherein the modulation signal module modulates the modulation signal V abc Comparing with the target sine waveform to obtain a modulation signal f m According to the following formula:
wherein f m For modulating signals, U abc As an ideal voltage signal, U ref K being the amplitude of the voltage signal i Is the regulator parameter.
12. The system of claim 7, wherein the system further comprises: the system dynamic model building module is specifically used for:
dividing a router system into five links of high-voltage direct current, high-voltage alternating current, low-voltage direct current, low-voltage alternating current and high-frequency transformer, and respectively establishing discrete models for the links;
the discrete model established by coordination control determines corresponding control strategies respectively aiming at a load link, a power supply link and a high-frequency transformer link;
establishing a distributed energy source and an energy storage system electric appliance model: according to an energy storage system established under a single direct current load, a hybrid charging strategy is adopted, and constant-current charging is converted into constant-voltage charging; MPPT is adopted as an outer ring link of a switching device control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback steady-current inductor to form a double closed-loop control strategy;
The net side frame structure is added into the filtering system.
13. The system of claim 7, wherein the system further comprises: the switching control mechanism module is specifically used for:
partitioning a multiport common high-frequency alternating-current bus electric energy router system according to the topological structure and the position of an electric and electronic device;
different control strategies are established for the power electronic converters in different areas;
when the system runs stably, a detection system is established, and a control strategy of the detection system judges whether the system has faults or not within repeated interruption time; when the detector judges that the system fails, all power ports and failure ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected again after the failure ports are removed, and whether the system can stably operate is checked: if the operation can be stabilized, recovering to a judging link of detecting the port fault by the detector; if the operation can not be stabilized, rearranging the system control strategy, and repeatedly detecting whether the operation can be stabilized;
establishing a real-time monitoring system, and determining that each variable is maintained in a constraint range when the system stably operates; if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, an alarm is sent to the monitoring system, and whether the operation is stopped or not is judged to be subjected to system level correction.
14. An apparatus, the apparatus comprising: the device comprises a data acquisition device, a processor and a memory;
the data acquisition device is used for acquiring data; the memory is used for storing one or more program instructions; the processor being configured to execute one or more program instructions for performing the method of any of claims 1-6.
15. A computer readable storage medium having one or more program instructions embodied therein for performing the method of any of claims 1-6.
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