CN114188933A - Direct current collecting system of wave energy power generation device and control method and system thereof - Google Patents

Direct current collecting system of wave energy power generation device and control method and system thereof Download PDF

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Publication number
CN114188933A
CN114188933A CN202111503579.XA CN202111503579A CN114188933A CN 114188933 A CN114188933 A CN 114188933A CN 202111503579 A CN202111503579 A CN 202111503579A CN 114188933 A CN114188933 A CN 114188933A
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module
sub
voltage
control
switch tube
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CN114188933B (en
Inventor
王红星
梁崇淦
刘石
李铭钧
段新辉
刘志刚
杨毅
郭敬梅
吴亦竹
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China Southern Power Grid Power Technology Co Ltd
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China Southern Power Grid Power Technology Co Ltd
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Priority to PCT/CN2022/101828 priority patent/WO2023103352A1/en
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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/02—Arrangements for reducing harmonics or ripples
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The application discloses a direct current collection system of a wave energy power generation device and a control method and a system thereof. The low-voltage sides of the sub-modules in the direct current power collection system are dispersed and can be independently connected into the wave energy generator set; a plurality of sub-modules on the high-voltage side are connected in series and connected with a high-voltage direct-current network, so that high-voltage electric energy transmission is realized, and the construction cost of the converter and the network structure thereof is effectively reduced. The application further provides a control method and a control system of the direct current collecting system, and the control method and the control system can be used for realizing series decoupling, independent control, power bidirectional flow and self-adaptive control of the wave energy generating set of the high-voltage side sub-module. Thereby the technical problem that the prior art is poor in stability and high in cost is solved.

Description

Direct current collecting system of wave energy power generation device and control method and system thereof
Technical Field
The application relates to the technical field of electric power, in particular to a direct current collecting system of a wave energy power generation device and a control method and system thereof.
Background
Wave energy is a rich renewable ocean resource, has a series of characteristics of large storage capacity, wide distribution space, no pollution and the like, and has wide application prospect in power generation by utilizing the wave energy under the development background of 'carbon peak reaching and carbon neutralization'. The array floater type wave energy power generation realizes continuous and uniform absorption of wave energy at different positions by orderly arranging a plurality of oscillating floaters in a certain sea area in an array manner, better meets the requirements of large-scale and large-scale power generation, and is an important direction for research and development of large-scale wave energy power generation devices at present.
At present, a large array float type wave energy power generation device has two modes of alternating current collection and direct current collection. The alternating current collection mode at least adopts a two-stage conversion mode (AC/DC + DC/AC) to realize stable alternating current energy serial/parallel transmission. However, the alternating current collection mode has many control influence factors (amplitude, frequency and phase angle), many times of electric energy conversion, large difficulty in converter structure and control and high construction cost, which seriously restricts the development of the alternating current collection mode in the field of wave energy power generation. The direct current collection mode mainly comprises a direct current series connection mode and a direct current parallel connection mode. The direct current collection method mainly comprises: a direct current series form and a direct current parallel form. Wherein. The dc parallel connection is limited by the withstand voltage class and power class of the semiconductor device, and the dc parallel connection generally requires a plurality of dc converters to convert low/medium voltage dc into high voltage dc and to realize high voltage transmission. The realization cost of the direct current collection mode of the wave energy power generation device is greatly improved, and the development of wave energy power generation is hindered; in the direct current series connection mode, at a high-voltage side, each converter is a current source substantially, and serious coupling problems exist among ports, so that each port has the characteristic of unbalanced voltage distribution under the disturbance of wave characteristics, the complexity of control is increased, and the safe and stable operation of a direct current series connection system is not facilitated.
Disclosure of Invention
The application provides a direct current collecting system of a wave energy power generation device and a control method and system thereof, which are used for solving the technical problems of poor stability and high cost in the prior art.
In view of the above, a first aspect of the present application provides a direct current collecting system for a wave energy power generation device, the system including:
n sub-modules, the sub-modules comprising: the high-frequency inductor comprises a diode, a low-voltage side half-bridge module consisting of an input side capacitor, a first switching tube and a second switching tube, a high-frequency inductor, and a high-voltage side half-bridge module consisting of an output side capacitor, a third switching tube and a fourth switching tube;
a switch tube in the low-voltage side half-bridge module is connected with a diode in an anti-parallel mode, and the diode is connected with an output interface of the wave energy generator set;
the low-voltage side half-bridge module is connected with the high-voltage side half-bridge module through the high-frequency inductor;
and the high-voltage side half-bridge modules in every two adjacent sub-modules are used as high-voltage side ports to be connected in series and then are connected into a high-voltage direct-current power grid.
Optionally, the low-voltage side half-bridge module formed by the input side capacitor, the first switching tube, and the second switching tube specifically includes:
the first switching tube is connected with the second switching tube in series and then connected with the input side capacitor in parallel;
the first switch tube is a high-voltage side switch tube, and the second switch tube is a low-voltage side switch tube.
Optionally, the high-voltage side half-bridge module formed by the output side capacitor, the third switching tube and the fourth switching tube specifically includes:
the third switching tube and the fourth switching tube are connected in series and then connected in parallel with the output side capacitor;
the third switch tube is a high-voltage side switch tube, and the fourth switch tube is a low-voltage side switch tube.
Optionally, the low-voltage side half-bridge module is connected to the high-voltage side half-bridge module through the high-frequency inductor, and specifically includes:
two ends of a second switching tube in the low-voltage side half-bridge module are led out to form a low-voltage side high-frequency port which is connected with a high-frequency inductor in series;
and two ends of a fourth switching tube in the high-voltage side half-bridge module are led out to form a high-voltage side high-frequency port which is connected with a high-frequency inductor.
In a second aspect, the present application provides a method for controlling a dc power collecting system, which is applied to the dc power collecting system of the wave energy power generation device in the first aspect, and the method includes:
selecting a control strategy according to the types of the wave energy generator set and the rectifier of the access sub-module;
when the sub-module is connected with a wave energy generating set with uncontrolled rectification, a first modulation wave signal of the sub-module is generated through a control frame consisting of a speed control loop, an output voltage control loop and an inductive current loop, and a switch tube in the sub-module is controlled;
when the sub-module is connected with a wave energy generating set of which the type is PWM rectification, a second modulation wave signal of the sub-module is generated through the output voltage control loop and the inductive current loop, and the switch tube in the sub-module is controlled.
Optionally, the generating, by a control frame composed of the speed control loop, the output voltage control loop, and the inductive current loop, a first modulated wave signal of the sub-module is generated to control the switching tube in the sub-module, which specifically includes:
the difference value of the rotating speed reference value and the actual rotating speed of the generator set is output through the PI controller, the difference value of the voltage reference value and the actual output voltage of the generator set is output through the PI controller, a first reference value of the inductive current is generated together, after the first reference value is compared with the actual inductive current value, a first modulation wave signal of the submodule is generated through the PI controller, and the switch tube in the submodule is controlled.
Optionally, the generating a second modulation wave signal of the sub-module by outputting the voltage control loop and the inductive current loop to control the switching tube in the sub-module specifically includes:
and generating a reference value of the inductive current by the difference value of the output voltage reference value and the actual output voltage of the generator set through a PI controller, comparing the reference value of the inductive current with the actual inductive current value, generating a second modulation wave signal of the submodule through the PI controller, and controlling a switch tube in the submodule.
A third aspect of the present application provides a control system of a dc current collecting system, the system including:
the analysis module is used for selecting a control strategy according to the types of the wave energy generator set and the rectifier of the access sub-module;
the first control module is used for generating a first modulation wave signal of the submodule through a control frame consisting of a speed control loop, an output voltage control loop and an inductive current loop when the submodule is connected with a wave energy generating set of which the type is uncontrolled rectification, and controlling a switch tube in the submodule;
and the second control module is used for generating a second modulation wave signal of the submodule through the output voltage control circuit and the inductive current circuit when the submodule is connected with the wave energy generating set of which the type is PWM rectification, and controlling the switch tube in the submodule.
Optionally, the first control module is specifically configured to:
when the sub-module is connected with a wave energy generating set of which the type is uncontrolled rectification, the difference value of the rotating speed reference value and the actual rotating speed of the generating set is output through the PI controller, the difference value of the voltage reference value and the actual output voltage of the generating set is output through the PI controller, a first reference value of the inductive current is generated together, after the first reference value is compared with the actual inductive current value, a first modulation wave signal of the sub-module is generated through the PI controller, and the switching tube in the sub-module is controlled.
Optionally, the second control module is specifically configured to:
when the sub-module is connected with a wave energy generating set of which the type is PWM rectification, the difference value of the output voltage reference value and the actual output voltage of the generating set generates the reference value of the inductive current through the PI controller, and after the reference value of the inductive current is compared with the actual inductive current value, a second modulation wave signal of the sub-module is generated through the PI controller to control the switch tube in the sub-module.
According to the technical scheme, the method has the following advantages:
the application provides a direct current collection system of a wave energy power generation device and a control method and a system thereof. The low-voltage sides of the sub-modules in the direct current power collection system are dispersed and can be independently connected into the wave energy generator set; a plurality of sub-modules on the high-voltage side are connected in series and connected with a high-voltage direct-current network, so that high-voltage electric energy transmission is realized, and the construction cost of the converter and the network structure thereof is effectively reduced. The application further provides a control method of the direct current collecting system, and the control method can be used for realizing series decoupling, independent control, power bidirectional flow and self-adaptive control of the wave energy generating set of the high-voltage side sub-module.
Compared with the prior art, the application has the advantages that:
(1) the direct current collection system is suitable for different types of wave energy generating sets and rectification forms thereof, and flexible independent control and optimal power output application of multiple wave energy generating sets are achieved.
(2) The low-voltage side of the sub-modules in the direct-current collection system is dispersed, and the high-voltage side sub-modules are connected in series, so that the number of power electronic energy conversion modules is reduced, and the construction cost of the converter and the network structure of the converter is effectively reduced.
(3) The direct current collecting device has independent submodules, simple control structure and strong stability, and can effectively inhibit high-voltage direct current voltage oscillation caused by voltage and power fluctuation of the wave energy generator set.
Drawings
Fig. 1 is a schematic topological structure diagram of a direct current collecting system of a wave energy power generation device provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of an embodiment of a method for controlling a dc power collection system according to the present disclosure;
fig. 3 is a schematic structural diagram of an embodiment of a control system of a dc power collection system provided in the embodiment of the present application;
fig. 4 is a schematic view of a submodule structure of the dc current collecting system;
FIG. 5 is a schematic diagram of a sub-module modulation strategy;
FIG. 6a is a schematic diagram of a buck mode of the submodule;
FIG. 6b is a schematic of a boost mode of the submodule;
fig. 7 is a schematic diagram of a control strategy of the dc current collection system;
FIG. 8 is a schematic diagram of a control strategy for an uncontrolled rectifier interface;
FIG. 9 is a schematic diagram of a control strategy for a PWM rectifier interface;
FIG. 10 is a schematic voltage diagram of the DC collection system and its submodules under balanced wave power;
FIG. 11 is a schematic voltage diagram of the DC current collection system and its submodules under unbalanced wave power;
fig. 12a is a schematic voltage diagram of a dc current collecting system and its submodules under time-varying wave power imbalance;
fig. 12b is a schematic diagram of time varying wave power imbalance input mechanical torque.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Referring to fig. 1, a direct current collecting system of a wave energy power generation device provided in an embodiment of the present application includes:
n sub-modules (n is a positive integer), the sub-modules comprising: the low-voltage side half-bridge module is formed by connecting a diode, a high-frequency inductor and an input side capacitor in parallel after a first switching tube and a second switching tube are connected in series; the high-voltage side half-bridge module is formed by connecting a third switching tube and a fourth switching tube in series and then connecting the third switching tube and the fourth switching tube in parallel with an output side capacitor; the first switch tube is a high-voltage side switch tube, the second switch tube is a low-voltage side switch tube, the third switch tube is a high-voltage side switch tube, and the fourth switch tube is a low-voltage side switch tube. A switching tube in the low-voltage side half-bridge module is connected with a diode in an anti-parallel mode, and the diode is connected with an output interface of the wave energy generator set; two ends of a second switching tube in the low-voltage side half-bridge module are led out to form a low-voltage side high-frequency port which is connected with the high-frequency inductor in series; and after the high-voltage side half-bridge modules in every two adjacent submodules are used as high-voltage side ports to be connected in series, the high-voltage side half-bridge modules are connected into a high-voltage direct-current power grid.
It should be noted that, in practical engineering, a Permanent Magnet Synchronous Motor (PMSM) may be used as a wave energy generator set, and further, direct current electric energy conversion is performed through an uncontrolled rectifier or a PWM rectifier.
The submodule of the dc current collecting system provided in this embodiment adopts a four-switch buck-boost dc converter, where V isi,i1,2,3 … is the low voltage dc side voltage for each submodule. VsiIs the sub-module high side voltage.
The high-voltage sides of the submodules are connected in series, and the voltage sum is high-voltage direct-current bus voltage Vs。Ci,LiAnd C andsirespectively an input capacitor, an input inductor and an output capacitor of the ith sub-module.
The ith sub-module further comprises four switching tubes and diodes, wherein the switching tubes are connected with the diodes in an anti-parallel mode, the first switching tube is connected with the second switching tube in series and then connected with the input side capacitor in parallel to form a low-voltage side half-bridge module, the first switching tube is a high-voltage side switching tube, and the second switching tube is a low-voltage side switchSwitching off the transistor, wherein the voltage across the input side capacitor is ViAnd two ends of the second switching tube are led out to form a low-voltage side high-frequency port, and the low-voltage side high-frequency port is connected with the high-voltage side half-bridge module after being connected with the high-frequency inductor in series.
In the high-voltage side half bridge, a third switch tube and a fourth switch tube are connected in series and then connected in parallel with an output side capacitor, the third switch tube is a high-voltage side switch tube, the fourth switch tube is a low-voltage side switch tube, and the voltage at two ends of the output side capacitor is VsiAnd two ends of the fourth switching tube are led out to form a high-voltage side high-frequency port which is connected with the high-frequency inductor.
And electrical output interfaces of the wave energy generator sets are mutually independent and are connected with the sub-modules in a dispersed manner. And high-voltage side ports of the sub-modules are connected in series and are connected into a high-voltage direct-current power grid.
Referring to fig. 1 and 4, fig. 4 is a schematic diagram of a submodule of a dc current collecting system, which can realize up-down conversion of dc voltage, satisfy bidirectional flow of electric energy, adapt to different rectifier interfaces of a wave energy power generation device, further adjust an operation mode of a wave energy generator set, and optimize a processing characteristic of the generator set.
In a dc current collection system, each submodule operates independently. The modulation strategy of the sub-module is shown in fig. 5, where Vc1And Vc2Is a carrier wave, VrFor modulating waves, Vs1And Vs3Is Si1And Si3The drive signal of (1). The switch driving signals of the same bridge arm are mutually conducted. Therefore, when VrWell below Vc2When the submodule is operating in buck mode, as shown in fig. 6 a. When V isrIs completely higher than Vc1When this happens, the sub-module operates in boost mode, as shown in FIG. 6 b.
Combining FIG. 5 and FIG. 6a, holding Si3Closing, Si4And (4) opening. Si1And Si2The sub-modules may be made as bi-directional buck converters. The output voltage is expressed as:
Vsi＝D*Vi (1)
combining FIG. 5 and FIG. 6b, holding Si2Closing, Si1And (4) opening. Si3And Si4The sub-modules can be made bidirectionalA boost converter. The output voltage is expressed as:
Vsi＝Vi/(1-D) (2)
for a dc current collector, the high voltage dc side voltage is:
Vs＝∑Vsi (3)
thus, the operating mode of the submodule can be dependent on the voltage ViAnd VrThe wave energy generator set has the advantages that adaptability change is carried out, and meanwhile, the voltage stability of a high-voltage side port and the efficient operation of the wave energy generator set are guaranteed.
In the application of the wave energy power generation device, an uncontrolled rectifier and a PWM rectifier are adopted for electric energy conversion, and the electric energy is used as an electric energy input power supply of a direct current collector. In the PWM rectifier, the Maximum Power Point (MPP) of the wave energy can be tracked and the dc bus voltage can be controlled. The function of the dc collector system submodule is therefore to guarantee the series voltage VsiAnd (5) stable operation. In an uncontrolled rectifier, PMSM speed, MPP, and dc bus voltage are not controlled. Thus, the series voltage V may be realized by the sub-modulessiStabilization and MPP tracking.
The above provides an embodiment of a direct current collecting system of a wave energy power generation device in an embodiment of the present application, and the following provides an embodiment of a control method of a direct current collecting system in an embodiment of the present application.
Aiming at various rectification modes in wave energy power generation application, the application also provides an adaptive control framework of the direct current collection system, as shown in fig. 7. The control method of the application is realized by three control loops, and the three control loops are specifically as follows: 1) a PMSM speed control loop, 2) a series output voltage control loop, and 3) a current control loop.
The PMSM speed control loop is suitable for a wave energy generator set of an uncontrolled rectifier interface. The series output voltage and the current control loop are commonly present in the wave energy generator set of the PWM rectifier interface and the uncontrolled rectifier interface, so that rapid current response and stable series side high-voltage direct current voltage are realized.
Referring to fig. 2, a method for controlling a dc power collecting system provided in an embodiment of the present application includes:
step 101, selecting a control strategy according to the types of the wave energy generator set and the rectifier of the access submodule;
it can be understood that the wave energy generator set connected to the low-voltage side port of the submodule in the direct current collection system, the rectifier type and the signal interface of the wave energy generator set are judged.
102, when the sub-module is connected with a wave energy generator set of an uncontrolled rectification type, generating a first modulation wave signal of the sub-module through a control frame consisting of a speed control loop, an output voltage control loop and an inductive current loop, and controlling a switch tube in the sub-module;
it should be noted that the submodule is connected to the uncontrollable rectification wave energy generator set, and the rotation speed of the generator set, the output voltage of the submodule and the inductive current are required to be sampled as a judgment basis.
When the submodule is connected to the wave energy generator set with uncontrolled rectification, the submodule control strategy adopts a control strategy 1, as shown in fig. 8, which includes: a speed control loop, an output voltage control loop and an inductor current loop. The difference value generated by comparing the rotating speed reference value with the actual rotating speed is output through the PI controller, and the difference value generated by comparing the output voltage reference value with the actual output voltage is output through the PI controller to jointly generate the reference value of the inductive current. After the reference value of the inductive current is compared with the actual inductive current value, a modulation wave signal of the submodule is generated through the PI controller, the switching tube is controlled, and optimal power control of the wave energy generator set, output voltage stabilization of the submodule and rapid dynamic response of a direct current collecting system are achieved.
And 103, when the sub-module is connected with a wave energy generator set with PWM rectification, generating a second modulation wave signal of the sub-module through an output voltage control loop and an inductive current loop, and controlling a switch tube in the sub-module.
It should be noted that, when the submodule is connected to the wave energy generator set rectified by PWM, the submodule control strategy adopts the control strategy 2, as shown in fig. 8, which includes: and the output voltage control loop and the inductance current loop. The difference value generated by comparing the output voltage reference value with the actual output voltage generates the reference value of the inductive current through the PI controller. After the reference value of the inductive current is compared with the actual inductive current value, a modulation wave signal of the submodule is generated through the PI controller, the switch tube is controlled, and the output voltage stability of the submodule and the quick dynamic response of a direct current collecting system are achieved.
The dc current collecting system mentioned above takes two sub-modules as an example. The wave energy generator set without controlled rectification is connected to the sub-module 1, the control strategy 1 is adopted, the PWM rectification generator set is connected to the sub-module 2, and the control strategy 2 is adopted.
Referring to fig. 10, 11, 12a, and 12b, the output voltage of sub-modules 1 and 2 is stabilized at 375V, and the high-side voltage Vs is maintained at 750V. Each submodule can be independently controlled, the voltage of the submodules is balanced, and the problem of unbalanced voltage in a series structure is effectively solved.
In FIG. 10, V is the rated value when the input torques are all rated valuess1,Vs2And VsAnd keeping stable. At the moment of 2s, the load is suddenly changed from 50% to full load, and the voltage on the high-voltage side can be restored to a normal level after a short slight fluctuation and can keep stable operation.
In fig. 11, V is the case where the input torque 1 is 1.0p.u. and the input torque 2 is 1.25p.u., respectivelys1，Vs2And VsAnd keeping stable. At the moment of 2s, the load suddenly changes from 50% to full load, and the high-side voltage can be restored to a normal level after a short slight fluctuation and can keep stable operation.
In fig. 12a, 12b, the input torque 1 increases at a rate of 1p.u./s, and the input torque 2 increases at a rate of 0.5p.u./s at 2 s. The load changes from 50% to full load, but the voltage remains at the normal level, Vs1And Vs2Is 375V, VsAt 750V, the dc current collector remained operating stably.
Therefore, the direct current collecting system of the large-scale array type wave energy power generation device and the control method thereof can keep the balance and stability of the voltage of the sub-modules and ensure the stability of the high-voltage direct current voltage for wave energy application. In addition, the wave energy generator set can be used as a voltage source of the direct current collector, so that the direct current collector sub-modules can operate independently, and the problem of voltage imbalance in a series structure is effectively avoided.
The above is an embodiment of a control method of a dc power collecting system provided in the embodiments of the present application, and the following is an embodiment of a control system of a dc power collecting system provided in the embodiments of the present application.
Referring to fig. 3, an embodiment of the present application provides a control system of a dc power collecting system, including:
the analysis module 201 is used for selecting a control strategy according to the types of the wave energy generator set and the rectifier which are connected into the sub-module;
the first control module 202 is used for generating a first modulation wave signal of the submodule through a control frame consisting of a speed control loop, an output voltage control loop and an inductive current loop when the submodule is connected with a wave energy generating set of which the type is uncontrolled rectification, and controlling a switch tube in the submodule;
and the second control module 203 is used for generating a second modulation wave signal of the submodule through the output voltage control circuit and the inductive current circuit when the submodule is connected with the wave energy generating set of which the type is PWM rectification, and controlling the switch tube in the submodule.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments 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.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A direct current collection system of a wave power generation device is characterized by comprising: n sub-modules, the sub-modules comprising: the high-frequency inductor comprises a diode, a low-voltage side half-bridge module consisting of an input side capacitor, a first switching tube and a second switching tube, a high-frequency inductor, and a high-voltage side half-bridge module consisting of an output side capacitor, a third switching tube and a fourth switching tube;
a switch tube in the low-voltage side half-bridge module is connected with a diode in an anti-parallel mode, and the diode is connected with an output interface of the wave energy generator set;
the low-voltage side half-bridge module is connected with the high-voltage side half-bridge module through the high-frequency inductor;
and the high-voltage side half-bridge modules in every two adjacent sub-modules are used as high-voltage side ports to be connected in series and then are connected into a high-voltage direct-current power grid.
2. The direct current collection system of wave energy power generation facility of claim 1, characterized in that, the low-voltage side half-bridge module that constitutes by input side electric capacity, first switch tube, second switch tube specifically includes:
the first switching tube is connected with the second switching tube in series and then connected with the input side capacitor in parallel;
the first switch tube is a high-voltage side switch tube, and the second switch tube is a low-voltage side switch tube.
3. The direct current collection system of wave energy power generation facility of claim 2, characterized in that, the high-side half-bridge module that constitutes by output side electric capacity, third switch tube, fourth switch tube specifically includes:
the third switching tube and the fourth switching tube are connected in series and then connected in parallel with the output side capacitor;
the third switch tube is a high-voltage side switch tube, and the fourth switch tube is a low-voltage side switch tube.
4. The direct current collection system for a wave energy power generation device according to claim 3, wherein the low-voltage side half-bridge module is connected to the high-voltage side half-bridge module through the high-frequency inductor, and specifically comprises:
two ends of a second switching tube in the low-voltage side half-bridge module are led out to form a low-voltage side high-frequency port which is connected with a high-frequency inductor in series;
and two ends of a fourth switching tube in the high-voltage side half-bridge module are led out to form a high-voltage side high-frequency port which is connected with a high-frequency inductor.
5. A control method of a direct current collection system, which is applied to the direct current collection system of the wave power generation device of any one of claims 1 to 4, the method comprising:
selecting a control strategy according to the types of the wave energy generator set and the rectifier of the access sub-module;
when the sub-module is connected with a wave energy generating set with uncontrolled rectification, a first modulation wave signal of the sub-module is generated through a control frame consisting of a speed control loop, an output voltage control loop and an inductive current loop, and a switch tube in the sub-module is controlled;
when the sub-module is connected with a wave energy generating set of which the type is PWM rectification, a second modulation wave signal of the sub-module is generated through the output voltage control loop and the inductive current loop, and the switch tube in the sub-module is controlled.
6. The method according to claim 5, wherein the generating a first modulated wave signal of the submodule through a control frame consisting of the speed control loop, the output voltage control loop and the inductor current loop to control the switching tube in the submodule specifically comprises:
the difference value of the rotating speed reference value and the actual rotating speed of the generator set is output through the PI controller, the difference value of the voltage reference value and the actual output voltage of the generator set is output through the PI controller, a first reference value of the inductive current is generated together, after the first reference value is compared with the actual inductive current value, a first modulation wave signal of the submodule is generated through the PI controller, and the switch tube in the submodule is controlled.
7. The method according to claim 5, wherein the generating a second modulated wave signal of the submodule through the output voltage control loop and the inductive current loop controls a switching tube in the submodule, and specifically comprises:
and generating a reference value of the inductive current by the difference value of the output voltage reference value and the actual output voltage of the generator set through a PI controller, comparing the reference value of the inductive current with the actual inductive current value, generating a second modulation wave signal of the submodule through the PI controller, and controlling a switch tube in the submodule.
8. A control system for a dc current collection system, comprising:
the analysis module is used for selecting a control strategy according to the types of the wave energy generator set and the rectifier of the access sub-module;
the first control module is used for generating a first modulation wave signal of the submodule through a control frame consisting of a speed control loop, an output voltage control loop and an inductive current loop when the submodule is connected with a wave energy generating set of which the type is uncontrolled rectification, and controlling a switch tube in the submodule;
and the second control module is used for generating a second modulation wave signal of the submodule through the output voltage control circuit and the inductive current circuit when the submodule is connected with the wave energy generating set of which the type is PWM rectification, and controlling the switch tube in the submodule.
9. The control system of the dc collection system according to claim 8, wherein the first control module is specifically configured to:
when the sub-module is connected with a wave energy generating set of which the type is uncontrolled rectification, the difference value of the rotating speed reference value and the actual rotating speed of the generating set is output through the PI controller, the difference value of the voltage reference value and the actual output voltage of the generating set is output through the PI controller, a first reference value of the inductive current is generated together, after the first reference value is compared with the actual inductive current value, a first modulation wave signal of the sub-module is generated through the PI controller, and the switching tube in the sub-module is controlled.
10. The control system of the dc collection system according to claim 8, wherein the second control module is specifically configured to:
when the sub-module is connected with a wave energy generating set of which the type is PWM rectification, the difference value of the output voltage reference value and the actual output voltage of the generating set generates the reference value of the inductive current through the PI controller, and after the reference value of the inductive current is compared with the actual inductive current value, a second modulation wave signal of the sub-module is generated through the PI controller to control the switch tube in the sub-module.
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