CN114188933B - 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 PDFInfo
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- CN114188933B CN114188933B CN202111503579.XA CN202111503579A CN114188933B CN 114188933 B CN114188933 B CN 114188933B CN 202111503579 A CN202111503579 A CN 202111503579A CN 114188933 B CN114188933 B CN 114188933B
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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
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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
- H02J1/02—Arrangements for reducing harmonics or ripples
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- 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]
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Abstract
The application discloses a wave energy power generation device's direct current collection system and control method and system thereof, direct current collection system includes n submodules, and submodule includes two half-bridge modules and a high frequency inductance. The low-voltage side of the submodule in the direct-current collecting system is dispersed, and the wave energy generator set can be independently connected; the high-voltage side sub-modules 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 a 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 realize series decoupling of the high-voltage side submodule, independent control, bidirectional power flow and self-adaptive control of the wave energy generator set. Thereby solving the technical problems of poor stability and high cost in the prior art.
Description
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
The 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 when the wave energy is used for generating electricity under the development background of carbon peak, carbon neutralization. The array float type wave energy power generation realizes continuous and uniform absorption of wave energy at different positions by orderly arranging a plurality of oscillating floats in an array in a certain sea area, better meets the requirements of large-scale power generation and is an important direction for the research and development of the current large-scale wave energy power generation device.
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 electric energy serial/parallel transmission. However, the ac collection mode has many control influencing factors (amplitude, frequency and phase angle), many electric energy conversion times, large converter structure and control difficulty and high construction cost, which severely restricts the development of the ac 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 mode mainly comprises the following steps: a direct current series form and a direct current parallel form. Wherein. The dc parallel connection is limited by the withstand voltage and power levels of the semiconductor device, and generally requires a plurality of dc converters to convert the low/medium voltage dc to the high voltage dc and to realize the high voltage transmission. The implementation cost of the direct current collection mode of the wave energy power generation device is greatly increased, and the development of wave energy power generation is hindered; in a direct current series connection mode, at a high voltage side, each converter is a current source, 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 control complexity 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, a control method and a control system thereof, which are used for solving the technical problems of poor stability and high cost in the prior art.
In view of this, the present application provides in a first aspect a direct current collector system for a wave energy power plant, the system comprising:
n submodules, the submodules comprising: the high-frequency inductor is connected with the high-frequency inductor through a first switch tube and a second switch tube, and the high-frequency inductor is connected with the high-frequency inductor through a second switch tube;
the switching tube in the low-voltage side half-bridge module is connected with the diode in anti-parallel, and the diode is connected with the 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 after 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, the high-voltage direct current power grid is connected.
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 and the second switching tube are connected in series and then connected in parallel with the input side capacitor;
the first switching tube is a high-voltage side switching tube, and the second switching tube is a low-voltage side switching 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 with the output side capacitor in parallel;
the third switching tube is a high-voltage side switching tube, and the fourth switching tube is a low-voltage side switching tube.
Optionally, the low-voltage side half-bridge module is connected with 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 the high-frequency inductor.
A second aspect of the present application provides a control method of a dc collecting system, applied to the dc collecting system of the wave energy power generation device according to the first aspect, the method including:
selecting a control strategy according to the types of the wave energy generator set and the rectifier connected to the sub-module;
when the type of the sub-module is an uncontrolled rectifying wave energy generator set, a first modulation wave signal of the sub-module is generated through a control frame formed by a speed control loop, an output voltage control loop and an inductance current loop, and a switching tube in the sub-module is controlled;
when the sub-module is connected with the wave energy generator set with PWM rectification, a second modulation wave signal of the sub-module is generated through the output voltage control loop and the inductance current loop, and a switching tube in the sub-module is controlled.
Optionally, the control frame formed by the speed control loop, the output voltage control loop and the inductor current loop generates a first modulation wave signal of the submodule, and controls a switching tube in the submodule, which specifically includes:
and the difference value between the rotating speed reference value of the generator set and the actual rotating speed is output by the PI controller, the difference value between the rotating speed reference value of the generator set and the actual output voltage is output by the PI controller, a first reference value of the inductive current is generated together, the first reference value is compared with the actual inductive current value, and a first modulation wave signal of the sub-module is generated by the PI controller, so that a switching tube in the sub-module is controlled.
Optionally, the generating the second modulated wave signal of the submodule through the output voltage control loop and the inductor current loop controls a switching tube in the submodule, which specifically includes:
and generating a reference value of the inductance current by the difference value of the output voltage reference value and the actual output voltage of the generator set through the PI controller, comparing the reference value of the inductance current with the actual inductance current value, and generating a second modulation wave signal of the sub-module through the PI controller to control a switching tube in the sub-module.
A third aspect of the present application provides a control system for a dc collection system, the 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 which are connected with the sub-module;
the first control module is used for generating a first modulation wave signal of the sub-module through a control frame formed by the speed control loop, the output voltage control loop and the inductance current loop when the type of the sub-module connected is an uncontrolled rectifying wave energy generator set, and controlling a switching tube in the sub-module;
and the second control module is used for generating a second modulation wave signal of the submodule through the output voltage control loop and the inductance current loop when the submodule is connected with the PWM rectified wave power generator set, and controlling a switching tube in the submodule.
Optionally, the first control module is specifically configured to:
when the sub-module is connected to the wave energy generator set with uncontrolled rectification, the difference value between the rotating speed reference value and the actual rotating speed of the generator set is output by the PI controller, a first reference value of the inductive current is generated together with the difference value between the voltage reference value and the actual output voltage of the generator set, the first reference value is compared with the actual inductive current value, and a first modulation wave signal of the sub-module is generated by the PI controller, so that a switching tube in the sub-module is controlled.
Optionally, the second control module is specifically configured to:
when the sub-module is connected with the wave energy generator set with PWM rectification, the difference value between the output voltage reference value and the actual output voltage of the generator set is used for generating the reference value of the inductive current through the PI controller, the reference value of the inductive current is compared with the actual inductive current value, and a second modulation wave signal of the sub-module is generated through the PI controller, so that a switching tube in the sub-module is controlled.
From the above technical scheme, the application has the following advantages:
the application provides a direct current collecting system of a wave energy power generation device, a control method and a control system thereof. The low-voltage side of the submodule in the direct-current collecting system is dispersed, and the wave energy generator set can be independently connected; the high-voltage side sub-modules 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 a network structure thereof is effectively reduced. The application further provides a control method of the direct current collecting system, and the control method realizes series decoupling of the high-voltage side submodule, independent control, bidirectional power flow and self-adaptive control of the wave energy generator set.
Compared with the prior art, the application has the beneficial effects that:
(1) The direct current collecting 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 access of a plurality of wave energy generating sets are realized.
(2) The low-voltage side dispersing and high-voltage side multi-submodule series connection of the submodules in the direct-current collecting system reduces the number of the power electronic and electric energy conversion modules and effectively reduces the construction cost of the converter and the network structure thereof.
(3) The direct current collector 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 diagram of a topology structure of a dc collecting system of a wave energy power generation device according to an embodiment of the present application;
fig. 2 is a schematic flow chart of an embodiment of a control method of a dc collecting system provided in the embodiments of the present application;
fig. 3 is a schematic structural diagram of an embodiment of a dc current collecting system control system provided in the embodiments of the present application;
FIG. 4 is a schematic diagram of a submodule structure of a 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 a sub-module;
FIG. 6b is a schematic diagram of a boost mode of a sub-module;
FIG. 7 is a schematic diagram of a control strategy for a DC collector 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 diagram of the voltage of the DC collector system and its sub-modules under balanced wave power;
FIG. 11 is a schematic voltage diagram of a DC collector system and its sub-modules for unbalanced wave power;
FIG. 12a is a schematic diagram of the DC current collection system and its sub-modules under time-varying wave power imbalance;
fig. 12b is a time-varying wave power imbalance input mechanical torque schematic.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, a dc collecting system of a wave energy power generation device provided in an embodiment of the present application includes:
n submodules (n is a positive integer), the submodules comprising: the low-voltage side half-bridge module is formed by connecting a diode, a high-frequency inductor, a first switching tube and a second switching tube in series and then connecting the first switching tube and the second switching tube with an input side capacitor in parallel; 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 an output side capacitor in parallel; the first switching tube is a high-voltage side switching tube, the second switching tube is a low-voltage side switching tube, the third switching tube is a high-voltage side switching tube, and the fourth switching tube is a low-voltage side switching tube. The switching tube in the low-voltage side half-bridge module is connected with a diode in anti-parallel connection, 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 sub-modules are used as high-voltage side ports to be connected in series, the high-voltage direct current power grid is connected.
In practical engineering, a permanent magnet synchronous motor (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 direct current collecting system provided in this embodiment adopts a four-switch buck-boost direct current converter, wherein V i,i =1, 2,3, … is the low-side dc voltage of each sub-module. V (V) si Is the submodule high side voltage.
The high-voltage sides of the sub-modules are connected in series, and the sum of the voltages is the voltage V of the high-voltage direct-current bus s 。C i ,L i And C si The input capacitance, the input inductance and the output capacitance of the ith sub-module respectively.
The ith sub-module further comprises four switching tubes and diodes, wherein the switching tubes and the diodes are connected in anti-parallel, the first switching tube and the second switching tube are connected in series and then connected with an 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, the second switching tube is a low-voltage side switching tube, and the voltage at two ends of the input side capacitor is V i And 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-frequency inductor in series and then connected with the high-voltage side half-bridge module.
In the high-voltage side half-bridge, a third switching tube and a fourth switching tube are connected in series and then are connected with an output side capacitor in parallel, the third switching tube is a high-voltage side switching tube, the fourth switching tube is a low-voltage side switching tube, and the voltage at two ends of the output side capacitor is V si And 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.
The electric output interfaces of the wave energy generator sets are mutually independent and are connected with the submodules in a scattered manner. The 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 fig. 4, fig. 4 is a schematic diagram of a submodule of a direct current collecting system, which can realize the up-down conversion of direct current voltage, meet the bidirectional flow of electric energy, adapt to different rectifier interfaces of a wave energy generating device, further adjust the operation mode of the wave energy generating set, and optimize the processing characteristics of the generating set.
In a dc collection system, each sub-module is operated independently. The modulation strategy of the sub-module is shown in FIG. 5, where V c1 And V c2 Is carrier wave, V r For modulating wave, V s1 And V s3 Is S i1 And S is i3 Is provided. The switch driving signals of the same bridge arm are mutually conducted. Thus, when V r Is completely lower than V c2 When the submodule is operating in buck mode, as shown in fig. 6 a. When V is r Is totally higher than V c1 When the submodule is operating in boost mode, as shown in fig. 6 b.
With reference to fig. 5 and 6a, keep S i3 Closing, S i4 And opening. S is S i1 And S is i2 The submodule may be made a bi-directional buck converter. The output voltage is expressed as:
V si ＝D*V i (1)
with reference to fig. 5 and 6b, keep S i2 Closing, S i1 And opening. S is S i3 And S is i4 The submodule may be made a bi-directional boost converter. The output voltage is expressed as:
V si ＝V i /(1-D) (2)
for a dc current collector, the high dc side voltage is:
Vs＝∑V si (3)
the operation mode of the sub-module can thus be dependent on the voltage V i And V r And the adaptive change is carried out, and meanwhile, the stability of the high-voltage side port voltage and the efficient operation of the wave energy generator set are ensured.
In wave energy power generation applications, uncontrolled rectifiers and PWM rectifiers are employed for power conversion and as a power input source for the dc collector. In a PWM rectifier, the maximum power point (maximum power point, MPP) of the wave energy can be tracked and the dc bus voltage controlled. Therefore, the function of the submodule of the direct-current collecting system is to guarantee the series voltage V si And (3) stably operating. In an uncontrolled rectifier, PMSM speed,The MPP and dc bus voltage are not controlled. Thus, the series voltage V can be achieved by the submodule si Stabilization and MPP tracking.
The embodiments of the dc collecting system of the wave energy power generation device are provided in the embodiments of the present application, and the following is an embodiment of a control method of the dc collecting system in the embodiments of the present application.
For various rectifying modes in wave energy power generation application, the application also provides an adaptive control framework of the direct current collecting system, as shown in fig. 7. The control method is realized through 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, 3) a current control loop.
The PMSM speed control loop is suitable for a wave energy generator set with an uncontrolled rectifier interface. The series output voltage and the current control loop are commonly arranged in the wave energy generating set with the PWM rectifier interface and the uncontrolled rectifier interface so as to realize quick current response and stable series side high-voltage direct current voltage.
Referring to fig. 2, a control method of a dc current collecting system provided in an embodiment of the present application includes:
it can be understood that the wave energy generator set connected to the low-voltage side port of the submodule in the direct-current collecting system and the rectifier type and the signal interface of the wave energy generator set are judged.
102, when the type of the connected sub-module is an uncontrolled rectifying wave energy generator set, a first modulation wave signal of the sub-module is generated through a control frame formed by a speed control loop, an output voltage control loop and an inductance current loop, and a switching tube in the sub-module is controlled;
it should be noted that, the submodule is connected to the wave energy generator set with uncontrolled rectification, and the rotation speed of the generator set, the output voltage of the submodule and the inductance current are required to be sampled as the judgment basis.
When the submodule is connected into the wave energy generator set with uncontrolled rectification, the submodule control strategy adopts a control strategy 1, as shown in fig. 8, and comprises the following steps: 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 by the PI controller, and the difference value generated by comparing the rotating speed reference value with the output voltage reference value and the actual output voltage is output by the PI controller, so that the reference value of the inductance current is generated together. After the reference value of the inductance current is compared with the actual inductance current value, a modulating wave signal of the submodule is generated through the PI controller, and the switching tube is controlled, so that the optimal power control of the wave energy generator set, the stability of the output voltage of the submodule and the quick dynamic response of the direct current collecting system are realized.
And 103, when the sub-module is connected with the wave energy generator set with PWM rectification, generating a second modulation wave signal of the sub-module through the output voltage control loop and the inductance current loop, and controlling a switching 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 a control strategy 2, as shown in fig. 8, including: an output voltage control loop and an inductor current loop. The difference value generated by comparing the output voltage reference value with the actual output voltage generates a reference value of the inductor current through the PI controller. After the reference value of the inductance current is compared with the actual inductance current value, a modulating wave signal of the submodule is generated through the PI controller, and the switching tube is controlled, so that the stability of output voltage of the submodule and the quick dynamic response of the direct-current collecting system are realized.
The above-mentioned direct current collecting system takes two sub-modules as an example. The sub-module 1 is connected with a wave energy generator set with uncontrolled rectification, a control strategy 1 is adopted, the sub-module 2 is connected with a PWM rectification generator set, and a control strategy 2 is adopted.
Referring to fig. 10, 11, 12a, 12b, the output voltages of the sub-modules 1 and 2 are stabilized at 375V, and the high-side voltage Vs is maintained at 750V. Each sub-module can be independently controlled, and the voltage of the sub-modules is balanced, so that the problem of unbalanced voltage in a series structure is effectively avoided.
In FIG. 10, when the input torques are ratedWhen taking the value, V s1 ,V s2 And V s And remains stable. At time 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 stable operation is maintained.
In fig. 11, V is set when the input torque 1 is 1.0p.u., and the input torque 2 is 1.25p.u. s1 ，V s2 And V s And remains stable. At time 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 stable operation is maintained.
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 is changed from 50% to full load, but the voltage remains at normal level, V s1 And V s2 Is 375V, V s At 750V, the dc current collector remained stable.
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 voltage balance and stability of the sub-modules, and ensure the stability of high-voltage direct current voltage applied to wave energy. Moreover, the wave energy generator set can be used as a voltage source of a direct current collector, so that the direct current collector submodules can operate independently of each other, and the problem of unbalanced voltage in a series structure is effectively avoided.
The foregoing is an embodiment of a control method of a dc power collecting system in the embodiments of the present application, and the following is an embodiment of a control system of a dc power collecting system in the embodiments of the present application.
Referring to fig. 3, in an embodiment of the present application, a control system of a dc current collecting system is provided, 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 connected to the sub-module;
the first control module 202 is configured to generate a first modulated wave signal of the sub-module through a control frame formed by the speed control loop, the output voltage control loop and the inductor current loop when the sub-module is connected to the wave energy generator set with uncontrolled rectification, and control a switching tube in the sub-module;
and the second control module 203 is configured to generate a second modulated wave signal of the submodule through the output voltage control loop and the inductor current loop when the submodule is connected to the wave energy generator set with PWM rectification, and control the switching tube in the submodule.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working procedures of the above-described system and unit may refer to the corresponding procedures in the foregoing method embodiments, which are not repeated here.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example. 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 this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). 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 this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
The above embodiments are merely for illustrating the technical solution 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (6)
1. A control method of a dc collecting system, which is applied to a dc collecting system of a wave power generation device, the dc collecting system comprising: n submodules, the submodules comprising: the high-frequency inductor is connected with the high-frequency inductor through a first switch tube and a second switch tube, and the high-frequency inductor is connected with the high-frequency inductor through a second switch tube;
the switching tube in the low-voltage side half-bridge module is connected with the diode in anti-parallel, and the diode is connected with the 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;
the high-voltage side half-bridge modules in every two adjacent sub-modules are connected in series as high-voltage side ports and then connected into a high-voltage direct-current power grid;
the method comprises the following steps:
selecting a control strategy according to the types of the wave energy generator set and the rectifier connected to the sub-module;
when the type of the sub-module is an uncontrolled rectifying wave energy generator set, a first modulation wave signal of the sub-module is generated through a control frame formed by a speed control loop, an output voltage control loop and an inductance current loop, and a switching tube in the sub-module is controlled;
when the sub-module is connected with the wave energy generator set with PWM rectification, a second modulation wave signal of the sub-module is generated through the output voltage control loop and the inductance current loop, and a switching tube in the sub-module is controlled.
2. The method for controlling a dc collecting system according to claim 1, wherein the control frame formed by the speed control loop, the output voltage control loop and the inductor current loop generates a first modulated wave signal of the sub-module, and controls the switching tube in the sub-module, specifically comprising:
and the difference value between the rotating speed reference value of the generator set and the actual rotating speed is output by the PI controller, the difference value between the rotating speed reference value of the generator set and the actual output voltage is output by the PI controller, a first reference value of the inductive current is generated together, the first reference value is compared with the actual inductive current value, and a first modulation wave signal of the sub-module is generated by the PI controller, so that a switching tube in the sub-module is controlled.
3. The method for controlling a dc collecting system according to claim 1, wherein the generating the second modulated wave signal of the sub-module through the output voltage control loop and the inductor current loop, controlling the switching tube in the sub-module, specifically comprises:
and generating a reference value of the inductance current by the difference value of the output voltage reference value and the actual output voltage of the generator set through the PI controller, comparing the reference value of the inductance current with the actual inductance current value, and generating a second modulation wave signal of the sub-module through the PI controller to control a switching tube in the sub-module.
4. A control system for a dc power collection system, for use in a wave energy power generation device, the dc power collection system comprising: n submodules, the submodules comprising: the high-frequency inductor is connected with the high-frequency inductor through a first switch tube and a second switch tube, and the high-frequency inductor is connected with the high-frequency inductor through a second switch tube;
the switching tube in the low-voltage side half-bridge module is connected with the diode in anti-parallel, and the diode is connected with the 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;
the high-voltage side half-bridge modules in every two adjacent sub-modules are connected in series as high-voltage side ports and then connected into a high-voltage direct-current power grid;
the control system includes:
the analysis module is used for selecting a control strategy according to the types of the wave energy generator set and the rectifier which are connected with the sub-module;
the first control module is used for generating a first modulation wave signal of the sub-module through a control frame formed by the speed control loop, the output voltage control loop and the inductance current loop when the type of the sub-module connected is an uncontrolled rectifying wave energy generator set, and controlling a switching tube in the sub-module;
and the second control module is used for generating a second modulation wave signal of the submodule through the output voltage control loop and the inductance current loop when the submodule is connected with the PWM rectified wave power generator set, and controlling a switching tube in the submodule.
5. The control system of a direct current collection system according to claim 4, wherein the first control module is specifically configured to:
when the sub-module is connected to the wave energy generator set with uncontrolled rectification, the difference value between the rotating speed reference value and the actual rotating speed of the generator set is output by the PI controller, a first reference value of the inductive current is generated together with the difference value between the voltage reference value and the actual output voltage of the generator set, the first reference value is compared with the actual inductive current value, and a first modulation wave signal of the sub-module is generated by the PI controller, so that a switching tube in the sub-module is controlled.
6. The control system of a direct current collection system according to claim 4, wherein the second control module is specifically configured to:
when the sub-module is connected with the wave energy generator set with PWM rectification, the difference value between the output voltage reference value and the actual output voltage of the generator set is used for generating the reference value of the inductive current through the PI controller, the reference value of the inductive current is compared with the actual inductive current value, and a second modulation wave signal of the sub-module is generated through the PI controller, so that a switching tube in the sub-module is controlled.
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| PCT/CN2022/101828 WO2023103352A1 (en) | 2021-12-09 | 2022-06-28 | Direct-current power collection system of wave energy power generation device, and control method and system therefor |
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| CN105896646A (en) * | 2016-04-07 | 2016-08-24 | 东莞市太业电子股份有限公司 | Intelligent buck-boost charging/discharging circuit and charging/discharging method thereof |
| CN110829478B (en) * | 2019-10-30 | 2022-01-14 | 浙江大学 | Low-frequency alternating-current uncontrolled rectification power transmission system of offshore wind power plant |
| CN111509774B (en) * | 2020-04-29 | 2023-03-31 | 国网山东省电力公司电力科学研究院 | Wave energy power generation system for meeting AC/DC independent power supply and operation control method thereof |
| CN112054685A (en) * | 2020-08-14 | 2020-12-08 | 中电普瑞电力工程有限公司 | Electric energy router and control method thereof |
| CN113067397A (en) * | 2021-04-13 | 2021-07-02 | 国家海洋技术中心 | Electrical conversion and control system of wave energy power generation device |
| CN114188933B (en) * | 2021-12-09 | 2023-06-02 | 南方电网电力科技股份有限公司 | Direct current collecting system of wave energy power generation device and control method and system thereof |
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| CN1641989A (en) * | 2004-01-14 | 2005-07-20 | 发那科株式会社 | Converter and inverter including converter circuit |
| EP3109992A1 (en) * | 2015-06-26 | 2016-12-28 | Hitachi, Ltd. | Power conversion apparatus and wind turbine generation system |
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