CN113991673A - 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 PDF

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CN113991673A
CN113991673A CN202111286429.8A CN202111286429A CN113991673A CN 113991673 A CN113991673 A CN 113991673A CN 202111286429 A CN202111286429 A CN 202111286429A CN 113991673 A CN113991673 A CN 113991673A
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voltage
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axis
control
link
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CN113991673B (en
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刘洋
李立生
张世栋
张林利
刘合金
苏国强
孙勇
李明洋
于海东
王峰
李帅
张鹏平
王倩
由新红
黄敏
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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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
    • 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
    • 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
    • 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
    • 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]
    • 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
    • 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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  • Power Engineering (AREA)
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Abstract

The embodiment of the application discloses a method and a system for controlling 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 the q axis and a reactive component as the d axis to realize the control of a double closed-loop outer loop; establishing decoupling control method in SVPWM modulation mode, and modulating signal V thereofabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion; modulating signal VabcComparing with the target sine waveform to obtain a modulation signal fmBy modulating signal generationThe multi-port common high-frequency electric energy router obtains a switch signal of the multi-port common high-frequency electric energy router. The function of controlling power exchange between the power grid and the router system is realized, and harmonic waves injected into the power grid by the router can be restrained.

Description

Multi-port common high-frequency electric energy router control method and system
Technical Field
The embodiment of the application relates to the technical field of electric energy routers, in particular to a control method and a control system of a multi-port common high-frequency electric energy router.
Background
With the continuous deterioration of ecological environment and the growing tension of energy supply and demand relationship, renewable energy is vigorously developed, the development of clean and low-carbon transformation of energy is accelerated, and the development of energy in the world is gradually the subject of energy development. The traditional power system cannot deal with various challenges such as 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 power grid and a direct-current power grid, not only can flexible and various interface forms be provided for a multi-source-load interaction scene, but also the functions of actively controlling the multi-directional flow of energy and managing the energy flow can be realized.
The application of large-scale power electronic devices introduces uncertain harmonic current of high frequency and wide frequency domain, when voltage and current of a stator of a generator contain harmonic components, the stator can output active power and reactive power to generate pulsation, complex problems of oscillation, instantaneous harmonic interaction, voltage flicker and the like of a generator set and a power grid are easily induced, and the generator set is split when serious, so that the safe and stable operation of the power grid is influenced. The electric energy router system has many influence factors of internal harmonic waves, including high-voltage side rectification harmonic waves, modulation of power electronic devices, line parameter resonance and the like. The accurate grasp of the harmonic output characteristics of the electric energy router can lay a foundation for controlling the electric energy output by the router system to accord with the grid-connected standard, the accurate research of the generation and the propagation mechanism of the harmonic in the router can inhibit the running loss of the high-frequency transformer, and the stability and the economy of the system are improved.
Scholars at home and abroad have certain research on the strategy for controlling the electric energy router, and most of the research focuses on how to realize power exchange among different ports of the router and is lack of harmonic wave treatment. For the electric energy router, the high-voltage side rectifying region is a part connected with a power grid, so the selection of the topological structure influences the harmonic current to the maximum extent. Different device structures and control strategies also have specific influences on the characteristics of harmonics, and meanwhile, when a router port is in fault or the operation state is unstable, unknown influences are generated on the harmonics injected into a power grid, so that the problems of measuring a router harmonic mechanism under dynamic operation and realizing the stable operation of a router system under the dynamic change of multi-element source loads are also difficult to solve urgently.
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, a harmonic suppression method for the common high-frequency alternating current bus electric energy router based on double phase-shifting control under multi-source load is provided, and a double closed-loop decoupling power control strategy is established at the same time, so that the function of controlling power exchange between a power grid and the router system can be realized, and the harmonic injected into the power grid by the router can be suppressed.
The problems of harmonic injection, router failure under dynamic operation and the like are solved.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
according to a first aspect of embodiments of the present application, there is provided a multi-port common high-frequency power router control method, 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 the q axis and a reactive component as the d axis to realize the control of a double closed-loop outer loop;
establishing decoupling control method in SVPWM modulation mode, and modulating signal V thereofabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion;
modulating signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator.
Optionally, the establishing a mathematical model of the multi-port common high-frequency electric energy router to determine a target decoupling link is performed according to the following formula:
Figure BDA0003333189390000021
Figure BDA0003333189390000022
Figure BDA0003333189390000023
Figure BDA0003333189390000024
wherein L is1、C1Inductance and capacitance values of the net side; i.e. i1Is an inductive current close to the point of connection, i1d、i1qD, q axis components for its coordinate transformation; i.e. il1Is an inductor current, i, close to the converterl1d、il1qD, q axis components for its coordinate transformation; u. ofcIs the capacitor voltage ucd、ucqD, q axis components for its coordinate transformation; u. oflIs the inductor voltage uld、ulqAre the d, q axis components of their coordinate transformations.
Optionally, according to components of d and q axes of the target decoupling link, the voltage stabilization component is given as the q axis, and the reactive component is given as the d axis, so as to realize control of the double closed-loop outer loop, according to the following formula:
Figure BDA0003333189390000031
in the formula idPIThe control signal is output by the regulator after being fed back; i.e. iqThe q-axis component after the coordinate transformation of the actual current value; u shapedc、Udc *The actual value and the given value of the direct current voltage are obtained; ki、KpIs a regulator parameter; the given value for d-axis current follows the following equation:
Q＝id*ω*Leq
wherein L iseqFor equivalent rotor inductance, Q is the reactive power consumed by a given system, ω is the angular velocity referenced to the net side signal, idGiven amount of d axis; with voltage on the DC side selected for the given value of q-axis currentThe feedback value, d-axis current setpoint, is determined by the reactive component of the control.
Optionally, the coordinate transformation value V of the modulation signal in the decoupling control processα，VβThe calculation formula is as follows:
Figure BDA0003333189390000032
Figure BDA0003333189390000033
wherein u isd、uqD and q axis components of coordinate transformation of actual voltage values; i.e. id、iqD and q axis components of coordinate transformation of the actual current value; i.e. idPI、iqPIA component output by the regulator for the control system; omega is the angular frequency of the modulation signal; l isllcIs the filter system inductance.
Optionally, modulating signal VabcComparing with the target sine waveform to obtain a modulation signal fmAccording to the following formula:
Figure BDA0003333189390000034
wherein f ismFor modulating signals, UabcFor ideal voltage signals, UrefIs the amplitude of the voltage signal, KiAre regulator parameters.
Optionally, the method further comprises the following steps:
dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively establishing a discrete model aiming at each link;
a discrete model established by coordination control determines corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively;
establishing a distributed energy and energy storage system electric appliance model: according to an energy storage system set 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 element control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback current stabilization inductor to form a double closed-loop control strategy;
the network side architecture incorporates a filtering system.
Optionally, the method further comprises the following steps:
partitioning the multi-port common high-frequency alternating current bus electric energy router system according to the topological structure and the position of the electric and electronic device;
different control strategies are established aiming at power electronic converters in different areas;
when the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the inside of the system has a fault within repeated interruption time; when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected with the grid again after the fault port is removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, rearranging the system control strategy, and repeatedly detecting whether the stable operation can be carried out or not;
establishing a real-time monitoring system, and determining that all variables are maintained in a constraint range when the system stably operates; and if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, sending an alarm to the monitoring system, and judging whether the operation needs to be stopped to receive the system level correction.
According to a second aspect of embodiments of the present application, there is provided a multi-port common high frequency power router control system, the system including:
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 ring control module is used for giving a voltage-stabilizing component as a q axis and a reactive component as a d axis according to components of the d axis and the q axis of a target decoupling link so as to realize the control of a double closed-loop outer ring;
an SVPWM modulation module for establishing a decoupling control method in an SVPWM modulation mode, and modulating a signal VabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion;
a modulation signal module for modulating the modulation signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator.
Optionally, in the decoupling module, a mathematical model is established to determine a target decoupling link, and the determination is performed according to the following formula:
Figure BDA0003333189390000051
Figure BDA0003333189390000052
Figure BDA0003333189390000053
Figure BDA0003333189390000054
wherein L is1、C1Inductance and capacitance values of the net side; i.e. i1Is an inductive current close to the point of connection, i1d、i1qD, q axis components for its coordinate transformation; i.e. il1Is an inductor current, i, close to the converterl1d、il1qD, q axis components for its coordinate transformation; u. ofcIs the capacitor voltage ucd、ucqD, q axis components for its coordinate transformation; u. oflIs the inductor voltage uld、ulqAre the d, q axis components of their coordinate transformations.
Optionally, the double-closed-loop outer-loop control module gives 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 implement control of a double-closed-loop outer loop according to the following formula:
Figure BDA0003333189390000055
in the formula idPIThe control signal is output by the regulator after being fed back; i.e. iqThe q-axis component after the coordinate transformation of the actual current value; u shapedc、Udc *The actual value and the given value of the direct current voltage are obtained; ki、KpIs a regulator parameter; the given value for d-axis current follows the following equation:
Q＝id*ω*Leq
wherein L iseqFor equivalent rotor inductance, Q is the reactive power consumed by a given system; the q-axis current given value is a feedback value of direct-current side voltage, and the d-axis current given value is determined by a controlled reactive component.
Optionally, the SVPWM modulation module decouples a coordinate transformation value V of the modulation signal in the control processα，VβThe calculation formula is as follows:
Figure BDA0003333189390000061
Figure BDA0003333189390000062
wherein u isd、uqD and q axis components of coordinate transformation of actual voltage values; i.e. id、iqD and q axis components of coordinate transformation of the actual current value; i.e. idPI、iqPIA component output by the regulator for the control system; omega is the angular frequency of the modulation signal; l isllcIs the filter system inductance.
Optionally, a modulation signal module for modulating the signal VabcComparing with the target sine waveform to obtain a modulation signal fmAccording to the following formula:
Figure BDA0003333189390000063
wherein f ismFor modulating signals, UabcFor ideal voltage signals, UrefIs the amplitude of the voltage signal, KiAre regulator parameters.
Optionally, the system further comprises: the system dynamic model establishing module is specifically used for:
dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively establishing a discrete model aiming at each link;
a discrete model established by coordination control determines corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively;
establishing a distributed energy and energy storage system electric appliance model: according to an energy storage system set 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 element control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback current stabilization inductor to form a double closed-loop control strategy;
the network side architecture incorporates a filtering system.
Optionally, the system further comprises: the switching management and control mechanism module is specifically configured to:
partitioning the multi-port common high-frequency alternating current bus electric energy router system according to the topological structure and the position of the electric and electronic device;
different control strategies are established aiming at power electronic converters in different areas;
when the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the inside of the system has a fault within repeated interruption time; when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected with the grid again after the fault port is removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, rearranging the system control strategy, and repeatedly detecting whether the stable operation can be carried out or not;
establishing a real-time monitoring system, and determining that all variables are maintained in a constraint range when the system stably operates; and if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, sending an alarm to the monitoring system, and judging whether the operation needs to be stopped to receive the system level correction.
According to a third aspect of embodiments herein, 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 to store 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 aspect.
According to a fourth aspect of embodiments herein, there is provided a computer-readable storage medium having one or more program instructions embodied therein for performing the method of any of the first aspects.
In summary, in the method and system for controlling the multi-port common-high-frequency electric energy router provided by the embodiments of the present 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 the q axis and a reactive component as the d axis to realize the control of a double closed-loop outer loop; establishing decoupling control method in SVPWM modulation mode, and modulating signal V thereofabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion; modulating signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator. The function of controlling power exchange between the power grid and the router system is realized, and harmonic waves injected into the power grid by the router can be restrained.
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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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
Fig. 1 is a schematic flowchart of a control method for a multi-port common high-frequency electric energy router according to an embodiment of the present disclosure;
FIG. 2 is a conceptual flow chart of a model provided by an embodiment of the present application;
FIG. 3 is an overall framework diagram of a model provided by an embodiment of the present application;
fig. 4a is a router distributed energy topology provided in an embodiment of the present application;
fig. 4b is a topology diagram of an energy storage system according to an embodiment of the present application;
fig. 5a is a block diagram of a double closed-loop decoupling control strategy provided in the embodiment of the present application;
FIG. 5b is a block diagram of a dual phase-shifting control strategy provided in 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 condition in a multi-source-load interaction scenario according to an embodiment of the present application;
fig. 6b is a harmonic analysis diagram of the injection system of the common high-frequency ac bus electric energy router system operating under the working condition of the double closed-loop decoupling control strategy in the multi-source-load interaction scenario provided in the embodiment of the present application;
fig. 7 is a diagram of a multi-port electric energy router system dynamic policy switching management controller provided in an embodiment of the present application;
FIG. 8a is a single-phase AC current diagram of the embodiment of the present application under operation of the dynamic management and control mechanism;
fig. 8b is a schematic diagram illustrating harmonic analysis of a dc port current under the operation of a dynamic management and 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 disclosure;
fig. 10 is a simulation result of stable operation achieved again by the port dynamic policy switching management and control mechanism when the common high-frequency power router system fails according to the embodiment of the present application;
fig. 11 is a block diagram of a control system of a multi-port common high-frequency power router according to an embodiment of the present application.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a flow diagram of a control method of a multi-port 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 the q axis and a reactive component as the d axis to realize the control of a double closed-loop outer loop;
step 103: establishing decoupling control method in SVPWM modulation mode, and modulating signal V thereofabcBy a quadratic decoupling formulaV obtained by coordinate transformationα、VβObtaining through conversion;
step 104: modulating signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator.
In a possible implementation manner, the establishing a mathematical model of the multi-port common high-frequency electric energy router to determine the target decoupling link is performed according to the following formula group (1):
Figure BDA0003333189390000091
wherein L is1、C1Inductance and capacitance values of the net side; i.e. i1Is an inductive current close to the point of connection, i1d、i1qD, q axis components for its coordinate transformation; i.e. il1Is an inductor current, i, close to the converterl1d、il1qD, q axis components for its coordinate transformation; u. ofcIs the capacitor voltage ucd、ucqD, q axis components for its coordinate transformation; u. oflIs the inductor voltage uld、ulqAre the d, q axis components of their coordinate transformations.
In one possible implementation, according to the components of d and q axes 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, according to the following formula (2):
Figure BDA0003333189390000101
in the formula idPIThe control signal is output by the regulator after being fed back; i.e. iqThe q-axis component after the coordinate transformation of the actual current value; u shapedc、Udc *The actual value and the given value of the direct current voltage are obtained; ki、KpIs a regulator parameter; the given value for d-axis current follows equation (3):
Q＝id*ω*Leqformula (3)
Wherein L iseqFor equivalent rotor inductance, Q is the reactive power consumed by a given system; the q-axis current given value is a feedback value of direct-current side voltage, and the d-axis current given value is determined by a controlled reactive component.
In a possible embodiment, the coordinate transformation value V of the modulation signal in the control process is decoupledα，VβThe calculation formula is shown in the following formula groups (4) and (5):
Figure BDA0003333189390000102
Figure BDA0003333189390000103
wherein u isd、uqD and q axis components of coordinate transformation of actual voltage values; i.e. id、iqD and q axis components of coordinate transformation of the actual current value; i.e. idPI、iqPIA component output by the regulator for the control system; omega is the angular frequency of the modulation signal; l isllcIs the filter system inductance.
In a possible embodiment, the signal V is modulatedabcComparing with the target sine waveform to obtain a modulation signal fmAccording to the following formula (6):
Figure BDA0003333189390000111
wherein f ismFor modulating signals, UabcFor ideal voltage signals, UrefIs the amplitude of the voltage signal, KiAre regulator parameters.
In one possible embodiment, the method further comprises the following steps: the method for establishing the system dynamic model of the multi-port common high-frequency electric energy router comprises the following steps:
dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively establishing a discrete model aiming at each link;
a discrete model established by coordination control determines corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively;
establishing a distributed energy and energy storage system electric appliance model: according to an energy storage system set 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 element control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback current stabilization inductor to form a double closed-loop control strategy;
the network side architecture incorporates a filtering system.
In one possible embodiment, the method further comprises the following steps: the method for establishing the dynamic policy switching management and control mechanism of the multi-port common high-frequency electric energy router system comprises the following steps:
partitioning the multi-port common high-frequency alternating current bus electric energy router system according to the topological structure and the position of the electric and electronic device;
different control strategies are established aiming at power electronic converters in different areas;
when the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the inside of the system has a fault within repeated interruption time; when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected with the grid again after the fault port is removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, rearranging the system control strategy, and repeatedly detecting whether the stable operation can be carried out or not;
establishing a real-time monitoring system, and determining that all variables are maintained in a constraint range when the system stably operates; and if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, sending an alarm to the monitoring system, and judging whether the operation needs to be stopped to receive the system level correction.
The embodiments of the present application will be further described with reference to the drawings and model simulations. FIG. 2 is a conceptual flow chart of a model provided by an embodiment of the present application; FIG. 3 is an overall framework diagram of a model provided by an embodiment of the present application; the method for establishing the dynamic model of the multi-port common high-frequency electric energy router system comprises the following detailed steps:
s1: dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively carrying out discrete modeling aiming at each link;
s2: and (3) coordinating and controlling a discrete model established, and formulating corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively. Controlling the converter on the network side of the high-frequency transformer to operate by adopting a dual phase-shifting strategy or an open-loop strategy;
s3: establishing a distributed energy and energy storage system electric appliance topology: according to an energy storage system set 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 current stabilization inductor to form a double closed-loop control strategy.
S4: a filtering system is added into a network side framework, and a double closed-loop decoupling control strategy is established for inhibiting the harmonic current component injected into a power grid by the router system aiming at the topological structure of the filtering system.
The embodiment of the application adopts a partition dynamic management and control mechanism to realize stable dynamic operation of the multi-port electric energy router, so that harmonic components injected into a system under the condition of abnormal operation of the router can be inhibited, the change characteristics of internal harmonics of the whole electric energy router system under the condition of dynamic change can be analyzed, and the model of the embodiment can realize the purposes of accurate monitoring, evaluation and effective inhibition on non-fundamental wave signals of the multi-port common high-frequency electric energy router system.
Fig. 4a is a router distributed energy topology provided in an embodiment of the present application; fig. 4b is a topology diagram of an energy storage system according to an embodiment of the present application; fig. 5a is a block diagram of a double closed-loop decoupling control strategy provided in the embodiment of the present application; fig. 5b is a block diagram of a dual phase-shifting control strategy provided in an embodiment of the present application. The multi-port common high-frequency electric energy router control method provided by the embodiment of the application can realize the function of controlling power exchange between a power grid and a router system and can also inhibit harmonic waves injected into the power grid by the router, and the method comprises the following steps:
s1: aiming at a control strategy of a grid-connected three-phase rectifier, firstly, determining a link needing decoupling through establishment and derivation of a mathematical model;
s2: considering the components of d and q axes required by a decoupling formula, setting a voltage-stabilizing component as the q axis and a reactive component as the d axis, and realizing the control of a double closed-loop outer ring;
s3: in order to reduce the low-order harmonic component caused by the own modulation mode, an SVPWM modulation mode is adopted, and a modulation signal V is modulatedabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion;
s4: in order to ensure the AC stability of the network side voltage and reduce the distortion rate, the transformed voltage value is compared with an ideal sine waveform to obtain a modulation signal fmAnd the switching signal can be obtained by modulating the signal generator.
Firstly, establishing a double closed loop decoupling control strategy: and (3) considering the influence of the network side filter on the signal value after the current coordinate transformation, establishing a mathematical model for coordinate transformation decoupling, wherein the decoupling formula is shown as a formula group (1).
Controlling d and q axis components after coordinate transformation, namely controlling power values exchanged between the grid-side converter and the power grid, and improving the mathematical model:
(1) the capacitance value in the filtering system has little influence on the voltage, so that the capacitive coupling can be ignored for simplification during decoupling;
(2) for the given value of the q-axis current, the feedback value of the direct-current side voltage can be selected to stabilize the effect of outputting the direct-current voltage. The given value of q-axis current can be selected from the feedback value of direct-current side voltage, and the given value of d-axis current can be determined by the reactive component of control according to the formula (2).
(3) The setpoint value for the d-axis current can be set by Q ═ id*ω*Leq，LeqQ gives the reactive power consumed by the system for an equivalent rotor inductance.
In order to reduce harmonic signals generated by modulation of the 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 processα，VβThe calculations are according to formula sets (4) and (5).
Transforming the coordinates of the formula to obtain transformed VabcAnd comparing the converted voltage value with an ideal sine waveform to obtain a modulation signal in order to ensure the alternating current stability of the network side voltage and reduce the distortion rate, as shown in formula (6).
The analysis diagrams of the harmonic wave of the double closed-loop decoupling control strategy and the common closed-loop control strategy are respectively shown in fig. 6a and fig. 6b, and it can be seen that the harmonic component and the amplitude can be effectively inhibited in the double closed-loop decoupling control strategy. The total harmonic content (THD) is reduced while the amplitude of the fundamental wave is reduced, and the control strategy is proved to be effective and can achieve the expected effect.
Fig. 7 is a flow chart of a dynamic policy switching management and control mechanism established in the embodiment of the present application and a corresponding diverse control block diagram of different areas; the method for establishing the dynamic policy switching management and control mechanism of the multi-port common high-frequency electric energy router system can be as follows:
s1: the multi-port common high-frequency alternating current bus electric energy router system is partitioned according to the topological structure and the position of an electric and electronic device, for example, the two-port router system can be divided into a network side area, a high-frequency area and a load area, and the three ports can be divided into the network side area, the high-frequency area, the load area, an energy storage area and the like;
s2: establishing a plurality of different control strategies aiming at power electronic converters in different areas, for example, establishing a double-closed-loop decoupling control strategy, active power flow control, single-closed-loop voltage control and the like in a network side area, establishing phase shift control, open-loop control and the like in a high-frequency area, establishing voltage closed-loop control, current closed-loop control and the like in a load area, and establishing constant-voltage charging, constant-current charging, mixed charging and the like in an energy storage area;
s3: and when different control strategies are coordinated and controlled, the multi-port router system can stably operate. When the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the system is in fault or not within repeated interruption time.
S4: when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected at the first time, system partition information is updated, system control strategies are rearranged, other disconnected ports are connected with the grid again after the fault ports are removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, the system control strategy is rearranged, and whether the stable operation can be carried out or not is repeatedly detected.
S5: and establishing a real-time monitoring system, and determining that all variables are 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 needs to be stopped to receive the system level correction is judged.
Fig. 8a shows a single-phase ac current diagram of the embodiment of the present application under the operation of the dynamic management and control mechanism, fig. 8b shows a harmonic analysis of the dc port current under the operation of the dynamic management and control mechanism, and fig. 9 shows a harmonic analysis of the dc port voltage link provided by the embodiment of the present application; it can be seen that the high frequency sub-harmonics thereof originate mainly from the high frequency carrier signal of the converter.
Fig. 10 shows a simulation result of stable operation achieved again by the port dynamic policy switching management and control mechanism when the common high-frequency electric energy router system fails, where in a strain situation when the dynamic management and control mechanism fails during operation, a load of a system port is disconnected at 1.25s, and at this time, a current suddenly drops to zero, but under the control of the dynamic management and control mechanism, another load port is not affected and can continue to operate normally; and at 1.9s, the detection port of the control mechanism can be put into operation again, and the current is restored to a normal level.
The harmonic component of the injection system under the abnormal operation condition of the router can be restrained, the harmonic component 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 purposes of accurate monitoring evaluation and effective restraint on the non-fundamental wave signal of the multi-port common high-frequency electric energy router system.
Therefore, the common high-frequency alternating-current bus electric energy router model based on the double phase-shifting control under the multi-element source-load interaction scene is established, and the common high-frequency alternating-current bus electric energy router model is suitable for harmonic analysis of a system under the condition of steady-state operation and can be used for measuring the harmonic change of the system under different working condition changes and system faults, so that the purposes of accurately monitoring, evaluating and dynamically analyzing the harmonic are achieved. The limitation that the existing router cannot inhibit the harmonic current injected into a power grid is broken through establishing a double-closed-loop decoupling control strategy, the stable operation of the router under a multi-source load dynamic change scene and a sudden fault can be realized through the proposed switching strategy control mode, and the analysis of a system harmonic spectrum is realized under the condition that a router system normally works.
In summary, the embodiment of the present application provides a control method for 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 the q axis and a reactive component as the d axis to realize the control of a double closed-loop outer loop; establishing a decoupling control method in an SVPWM (space vector pulse width modulation) mode to reduce harmonic signals generated by modulation of a conversion device; its modulated signal VabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion; the converted voltage value VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator. The method for restraining the harmonic waves of the common high-frequency alternating-current bus electric energy router based on the double phase-shifting control under the multi-source load is provided, and meanwhile, a double 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 waves injected into the power grid by the router can be restrained.
Based on the same technical concept, an embodiment of the present application further provides a multi-port common high-frequency electric energy router control system, as shown in fig. 11, the system includes:
the decoupling module 1101 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;
a double closed-loop outer-loop control module 1102, configured to give 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 implement control of a double closed-loop outer loop;
an SVPWM modulation module 1103 for establishing a decoupling control method in SVPWM modulation mode, which modulates a signal VabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion;
a modulation signal module 1104 for modulating the modulation signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator.
In one possible implementation, the decoupling module 1101 establishes a mathematical model to determine a target decoupling component, such as equation set (1).
In a possible implementation manner, the double 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 the target decoupling link, so as to implement control of the double closed-loop outer loop according to formula (2).
In a possible implementation, the SVPWM modulation module 1103 decouples the coordinate transformation value V of the modulation signal during the control processα，VβAccording to formula sets (4) and (5).
In one possible implementation, the modulation signal module 1104 converts the converted voltage value VabcComparing with the target sine waveform to obtain a modulation signal fmAs shown in equation (6).
In one possible embodiment, the system further comprises: the system dynamic model establishing module is specifically used for:
dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively establishing a discrete model aiming at each link;
a discrete model established by coordination control determines corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively;
establishing a distributed energy and energy storage system electric appliance model: according to an energy storage system set 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 element control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback current stabilization inductor to form a double closed-loop control strategy;
the network side architecture incorporates a filtering system.
In one possible embodiment, the system further comprises: the switching management and control mechanism module is specifically configured to:
partitioning the multi-port common high-frequency alternating current bus electric energy router system according to the topological structure and the position of the electric and electronic device;
different control strategies are established aiming at power electronic converters in different areas;
when the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the inside of the system has a fault within repeated interruption time; when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected with the grid again after the fault port is removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, rearranging the system control strategy, and repeatedly detecting whether the stable operation can be carried out or not;
establishing a real-time monitoring system, and determining that all variables are maintained in a constraint range when the system stably operates; and if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, sending an alarm to the monitoring system, and judging whether the operation needs to be stopped to receive the system level correction.
Based on the same technical concept, an embodiment of the present application further provides an apparatus, including: the device comprises a data acquisition device, a processor and a memory; the data acquisition device is used for acquiring data; the memory is to store 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 present 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 the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Reference is made to the description of the method embodiments.
It is noted that while the operations of the methods of the present invention are depicted in the drawings in a particular order, this is not a requirement or suggestion that the operations must be performed in this particular order or that all of the illustrated operations must be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
Although the present application provides method steps as in embodiments or flowcharts, additional or fewer steps may be included based on conventional or non-inventive approaches. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an apparatus or client product in practice executes, it may execute sequentially or in parallel (e.g., in a parallel processor or multithreaded processing environment, or even in a distributed data processing environment) according to the embodiments or methods shown in the figures. 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, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The units, devices, modules, etc. set forth in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the present application, the functions of each module may be implemented in one or more software and/or hardware, or a module implementing the same function may be implemented by a combination of a plurality of sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
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 the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be embodied 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, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a mobile terminal, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type 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 above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (16)

1. A method for controlling a multi-port common 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 the q axis and a reactive component as the d axis to realize the control of a double closed-loop outer loop;
establishing decoupling control method in SVPWM modulation mode, and modulating signal V thereofabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion;
modulating signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator.
2. The method of claim 1, wherein the establishing a mathematical model of the multi-port common-high-frequency power router to determine the target decoupling component is performed according to the following formula:
Figure FDA0003333189380000011
Figure FDA0003333189380000012
Figure FDA0003333189380000013
Figure FDA0003333189380000014
wherein L is1、C1Inductance and capacitance values of the net side; i.e. i1Is an inductive current close to the point of connection, i1d、i1qD, q axis components for its coordinate transformation; i.e. il1Is an inductor current, i, close to the converterl1d、il1qD, q axis components for its coordinate transformation; u. ofcIs the capacitor voltage ucd、ucqD, q axis components for its coordinate transformation; u. oflIs the inductor voltage uld、ulqAre the d, q axis components of their coordinate transformations.
3. The method of claim 1, wherein the control of the double closed loop outer loop is achieved by giving a voltage stabilizing component as the q-axis and a reactive component as the d-axis according to the d-and q-axis components of the target decoupling element according to the following formula:
Figure FDA0003333189380000015
in the formula idPIThe control signal is output by the regulator after being fed back; i.e. iqThe q-axis component after the coordinate transformation of the actual current value; u shapedc、Udc *The actual value and the given value of the direct current voltage are obtained; ki、KpIs a regulator parameter; the given value for d-axis current follows the following equation:
Q＝id*ω*Leq
wherein L iseqFor equivalent rotor inductance, Q is the reactive power consumed by a given system, ω is the angular velocity referenced to the net side signal, idGiven amount of d axis; the q-axis current given value is a feedback value of direct-current side voltage, and the d-axis current given value is determined by a controlled reactive component.
4. The method of claim 1, wherein the modulation signal coordinate transformation value V during control is decoupledα，VβThe calculation formula is as follows:
Figure FDA0003333189380000021
Figure FDA0003333189380000022
wherein u isd、uqD and q axis components of coordinate transformation of actual voltage values; i.e. id、iqD and q axis components of coordinate transformation of the actual current value; i.e. idPI、iqPIA component output by the regulator for the control system; omega is the angular frequency of the modulation signal; l isllcIs the filter system inductance.
5. Method according to claim 1, characterized in that the modulation signal V is modulatedabcComparing with the target sine waveform to obtain a modulation signal fmAccording to the following formula:
Figure FDA0003333189380000023
wherein f ismFor modulating signals, UabcFor ideal voltage signals, UrefIs the amplitude of the voltage signal, KiAre regulator parameters.
6. The method of claim 1, further comprising the steps of:
dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively establishing a discrete model aiming at each link;
a discrete model established by coordination control determines corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively;
establishing a distributed energy and energy storage system electric appliance model: according to an energy storage system set 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 element control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback current stabilization inductor to form a double closed-loop control strategy;
the network side architecture incorporates a filtering system.
7. The method of claim 1, further comprising the steps of:
partitioning the multi-port common high-frequency alternating current bus electric energy router system according to the topological structure and the position of the electric and electronic device;
different control strategies are established aiming at power electronic converters in different areas;
when the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the inside of the system has a fault within repeated interruption time; when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected with the grid again after the fault port is removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, rearranging the system control strategy, and repeatedly detecting whether the stable operation can be carried out or not;
establishing a real-time monitoring system, and determining that all variables are maintained in a constraint range when the system stably operates; and if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, sending an alarm to the monitoring system, and judging whether the operation needs to be stopped to receive the system level correction.
8. A multi-port common 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 ring control module is used for giving a voltage-stabilizing component as a q axis and a reactive component as a d axis according to components of the d axis and the q axis of a target decoupling link so as to realize the control of a double closed-loop outer ring;
an SVPWM modulation module for establishing a decoupling control method in an SVPWM modulation mode, and modulating a signal VabcV obtained by quadratic decoupling formula and coordinate transformationα、VβObtaining through conversion;
a modulation signal module for modulating the modulation signal VabcComparing with the target sine waveform to obtain a modulation signal fmAnd a multi-port common high-frequency electric energy router switching signal is obtained through the modulation signal generator.
9. The system of claim 8, wherein the decoupling module is configured to build a mathematical model to determine the target decoupling component according to the following equation:
Figure FDA0003333189380000041
Figure FDA0003333189380000042
Figure FDA0003333189380000043
Figure FDA0003333189380000044
wherein L is1、C1Inductance and capacitance values of the net side; i.e. i1Is an inductive current close to the point of connection, i1d、i1qD, q axis components for its coordinate transformation; i.e. il1Is an inductor current, i, close to the converterl1d、il1qD, q axis components for its coordinate transformation; u. ofcIs the capacitor voltage ucd、ucqD, q axis components for its coordinate transformation; u. oflIs an inductorVoltage uld、ulqAre the d, q axis components of their coordinate transformations.
10. The system of claim 8, wherein the double closed-loop outer-loop control module is configured to assign a regulated component as the q-axis and an idle component as the d-axis according to the d-and q-axis components of the target decoupling link to achieve control of the double closed-loop outer-loop according to the following formula:
Figure FDA0003333189380000045
in the formula idPIThe control signal is output by the regulator after being fed back; i.e. iqThe q-axis component after the coordinate transformation of the actual current value; u shapedc、Udc *The actual value and the given value of the direct current voltage are obtained; ki、KpIs a regulator parameter; the given value for d-axis current follows the following equation:
Q＝id*ω*Leq
wherein L iseqFor equivalent rotor inductance, Q is the reactive power consumed by a given system; the q-axis current given value is a feedback value of direct-current side voltage, and the d-axis current given value is determined by a controlled reactive component.
11. The system of claim 8, wherein the SVPWM modulation module decouples the transformed value V of the modulation signal coordinate during controlα，VβThe calculation formula is as follows:
Figure FDA0003333189380000051
Figure FDA0003333189380000052
wherein u isd、uqD and q axis components of coordinate transformation of actual voltage values; i.e. id、iqD and q axis components of coordinate transformation of the actual current value; i.e. idPI、iqPIA component output by the regulator for the control system; omega is the angular frequency of the modulation signal; l isllcIs the filter system inductance.
12. The system of claim 8, wherein the modulation signal module modulates the modulation signal VabcComparing with the target sine waveform to obtain a modulation signal fmAccording to the following formula:
Figure FDA0003333189380000053
wherein f ismFor modulating signals, UabcFor ideal voltage signals, UrefIs the amplitude of the voltage signal, KiAre regulator parameters.
13. The system of claim 8, wherein the system further comprises: the system dynamic model establishing module is specifically used for:
dividing a router system into five links of a high-voltage direct current, a high-voltage alternating current, a low-voltage direct current, a low-voltage alternating current and a high-frequency transformer, and respectively establishing a discrete model aiming at each link;
a discrete model established by coordination control determines corresponding control strategies aiming at a load link, a power supply link and a high-frequency transformer link respectively;
establishing a distributed energy and energy storage system electric appliance model: according to an energy storage system set 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 element control strategy of a distributed photovoltaic follow-up BOOST circuit, and the inner ring adopts the current of a negative feedback current stabilization inductor to form a double closed-loop control strategy;
the network side architecture incorporates a filtering system.
14. The system of claim 8, wherein the system further comprises: the switching management and control mechanism module is specifically configured to:
partitioning the multi-port common high-frequency alternating current bus electric energy router system according to the topological structure and the position of the electric and electronic device;
different control strategies are established aiming at power electronic converters in different areas;
when the system stably runs, a detection system is established, and a control strategy of the detection system judges whether the inside of the system has a fault within repeated interruption time; when the detector judges that a system fault occurs, all power supply ports and fault ports are disconnected, system partition information is updated, a system control strategy is rearranged, other disconnected ports are connected with the grid again after the fault port is removed, and whether the system can stably run is checked: if the operation can be stably carried out, the judgment link of the fault of the detection port of the detector is recovered; if the stable operation cannot be carried out, rearranging the system control strategy, and repeatedly detecting whether the stable operation can be carried out or not;
establishing a real-time monitoring system, and determining that all variables are maintained in a constraint range when the system stably operates; and if the voltage amplitude, the current amplitude and the phase angle exceed the set threshold values, sending an alarm to the monitoring system, and judging whether the operation needs to be stopped to receive the system level correction.
15. An apparatus, characterized in that the apparatus 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 to store one or more program instructions; the processor, configured to execute one or more program instructions to perform the method of any of claims 1-7.
16. A computer-readable storage medium having one or more program instructions embodied therein for performing the method of any of claims 1-7.
CN202111286429.8A 2021-11-02 2021-11-02 Multi-port common high frequency electric energy router control method and system Active CN113991673B (en)

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