CN114447985A - Wave power generation multi-source input electric energy conversion system - Google Patents

Abstract

The application discloses wave power generation multisource input electric energy conversion system includes: the power generation rectification module, the collection inversion module and the boosting grid-connected module are sequentially connected; the power generation rectification module comprises a power generation unit, a rectification unit and a measurement protection unit which are sequentially connected, and is used for converting irregular alternating current generated by the wave power generator set into stable direct current; the collection inversion module comprises a measurement protection unit and an inversion unit which are connected in sequence and is used for inverting the direct current; the boost grid-connected module comprises a boost transformer and a measurement protection unit and is used for boosting the inverted voltage; the multi-machine boosting transformer is adopted to carry out boosting processing on alternating current passing through the inversion unit, and the wiring mode is single-bus main wiring, single-bus subsection main wiring or star-shaped main wiring. By means of the mode, the power supply reliability and grid-connected stability of the wave power generation multi-source input electric energy conversion system in different application scenes are improved.

Description

Wave power generation multi-source input electric energy conversion system

Technical Field

The application relates to the technical field of electric energy conversion of a wave power generation system, in particular to a wave power generation multi-source input electric energy conversion system.

Background

The single machine installed capacity of the existing wave power generation device for sea test operation is relatively small, and the capacity is generally dozens to hundreds of kW; a single device is generally adopted to operate and generate electricity, so that the power supply capacity is limited; the power supply system is generally only used for supplying power to independent loads or micro-grids of remote island reefs, offshore facilities and the like, and does not participate in grid-connected operation of a large power grid on the shore.

Because the existing wave power generation device mainly adopts a single generator set to supply power to an independent load or a tiny power grid, the problems of main wiring and grid connection do not need to be considered, but with the increase of the installed capacity of a wave power generation platform and the requirement of grid connection operation, the wave power generation integrally shows the trend of development from the single generator set to a plurality of generator sets and development from a single device to an array type large scale, and through a cluster form, the system is promoted in the aspects of flexibility, reliability, performance and the like with relatively low cost investment. Therefore, the main wiring design and research of the wave power generation multi-source input electric energy conversion system adapting to the grid connection requirement are urgently needed to be developed.

Disclosure of Invention

The application provides a multi-source input electric energy conversion system for wave power generation, which aims to solve the problems that in the prior art, a single-source input unit for wave power generation is small in capacity, and the main wiring structure form and grid-connected operation requirements are not considered.

In order to solve the above technical problem, the present application provides a wave power generation multi-source input electric energy conversion system, including: the power generation rectification module, the collection inversion module and the boosting grid-connected module are sequentially connected; the power generation rectification module comprises a power generation unit, a rectification unit and a measurement protection unit which are sequentially connected, and is used for converting irregular alternating current generated by the wave power generator set into stable direct current; the collection inversion module comprises a measurement protection unit and an inversion unit which are connected in sequence and is used for inverting the direct current; the boost grid-connected module comprises a boost transformer and a measurement protection unit and is used for boosting the inverted voltage; the multi-machine sharing one step-up transformer is adopted to carry out step-up processing on the alternating current passing through the inversion unit, and the connection mode is single-bus main connection, single-bus subsection main connection or star-shaped main connection.

Optionally, in the power generation rectification module, the measurement protection unit includes a current transformer, a live display, a lightning arrester, a grounding switch, an isolation switch and a handcart type circuit breaker.

Optionally, in the power generation rectification module, the power generation unit is a permanent magnet direct drive generator, and the rectification unit is an AC/DC rectifier.

Optionally, the handcart type circuit breaker 101 is connected with the output end of the permanent magnet generator, and the lower end of the handcart type circuit breaker 101 is connected with the alternating current input end of the AC/DC rectifier through the current transformer 106; the live displays 103, 107 are used for reading the readings of the voltage transformer 102 and the current transformer 106 respectively.

Optionally, when the current transformer 106 monitors that the branch circuit is overcurrent, the handcart type circuit breaker 101 disconnects the power generation rectifying branch circuit to realize overcurrent protection, and when the voltage transformer 102 monitors that the branch circuit is overvoltage, the arrester 104 realizes overvoltage protection on the output branch circuit of the generator; the DC output end of the AC/DC rectifier is respectively connected to a DC collection bus through a handcart type breaker 108 and isolation switches 114 and 115, the output current of the AC/DC rectifier is measured through single-phase current transformers 113 and 116 which are connected with the DC collection bus and the isolation switches 114 and 115 in parallel, readings are displayed in real time through live- wire displays 112 and 117, and meanwhile branch overvoltage protection is realized through a lightning arrester 110 which is connected with the lower end of the handcart type breaker in parallel.

Optionally, the inverting unit comprises a DC/AC inverter; the DC input end of the DC/AC inverter is connected with a DC collection bus through a primary fuse, a handcart type circuit breaker and an isolating switch; the primary fuses 206 and 208, the lightning arresters 205 and 209 playing a role of overvoltage protection, the current transformers 203 and 211 for measuring the current of the single-phase branch, the live-line displays 204 and 210 for displaying the indication number of the current transformers and the grounding switches 202 and 212 for protection and maintenance are connected in parallel; the alternating current output end of the DC/AC inverter is connected with a low-voltage alternating current bus through a current transformer 213 and a handcart type breaker 217, and a lightning arrester 215 which plays an overvoltage protection role, a grounding switch 216 for protecting and overhauling and an electrified display 214 which displays the indication number of the current transformer are connected in parallel with a connecting branch between the upper end of the handcart type breaker 217 and the output end of the current transformer 213.

Optionally, the boost grid-connected module comprises a handcart type circuit breaker, a boost transformer, a voltage transformer, a current transformer, a live display, a lightning arrester and a grounding switch.

Optionally, the low-voltage side of the step-up transformer 304 is connected with a low-voltage alternating current bus through a current transformer 302 and the handcart type circuit breaker 301, and the low-voltage side branch current is measured by the current transformer 302 and displayed by a live display 305; the high-voltage side of the step-up transformer 304 is connected with a high-voltage alternating current bus through a current transformer 308 and a handcart type circuit breaker 309, overvoltage protection on the step-up transformer 304 is realized by utilizing an arrester 307 connected with a high-voltage side output branch in parallel, and meanwhile overcurrent protection of the step-up output branch is realized through the cooperation of the current transformer 308 and the handcart type circuit breaker 309.

Optionally, the multi-source input wave power generation rectification branch is collected on the direct current collection bus in a parallel connection mode, and finally the electric energy is transmitted to the shore for grid connection through the submarine cable by the alternating current through the inversion branch and the boosting grid connection branch.

Optionally, the input end of the step-up transformer adopts an alternating current collection form, and the DC/AC inverter of the inverting branch has the function of synchronously regulating and controlling the phase, amplitude and waveform of the alternating current output by each inverting branch so as to meet the synchronous requirement of alternating current collection.

The application provides a wave power generation multisource input electric energy conversion system, includes: the power generation rectification module, the collection inversion module and the boosting grid-connected module are sequentially connected; the power generation rectification module is used for converting irregular alternating current generated by the wave power generator set into stable direct current; the collection inversion module is used for inverting the direct current; the boosting grid-connected module is used for boosting the inverted voltage, and the wave power generation multi-source input electric energy conversion system can adopt a plurality of machines to share one boosting transformer to boost the alternating current passing through the inversion unit so as to improve the power supply reliability and grid-connected stability of the wave power generation multi-source input electric energy conversion system in different application scenes.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a single-bus main wiring structure diagram of a multi-source input electric energy conversion system for wave power generation according to the present application;

FIG. 2 is a single bus sectional main wiring structure diagram of the multi-source input electric energy conversion system for wave power generation according to the present application;

FIG. 3 is a star main wiring structure diagram of the multi-source input power conversion system for wave power generation according to the present application;

FIG. 4 is a structural diagram of a power generation rectification module of the wave power generation multi-source input electric energy conversion system of the present application;

FIG. 5 is a structural diagram of a direct current collection inversion module of the multi-source input electric energy conversion system for wave power generation according to the present application;

FIG. 6 is a structural diagram of a boosting and grid-connecting module of the multi-source input electric energy conversion system for wave power generation;

fig. 7 is a direct current collection buscouple circuit breaker structure diagram of a wave power generation multi-source input electric energy conversion system according to the present application.

Description of reference numerals: 101. 108, 201, 217, 301, 309, 405-handcart breaker, 102-voltage transformer with grounded secondary winding neutral point, 103, 107, 112, 117, 204, 210, 214, 305, 310, 407-live display, 104, 110, 205, 209, 215, 307-lightning arrester, 105, 109, 111. 118, 202, 212, 216, 303, 306-grounding switch, 114, 115, 207, 401, 402, 403, 404-isolating switch, 106, 213, 302, 308, 406-three-phase current transformer, 113, 116, 203, 211-single-phase current transformer, 206, 208-primary fuse, 304-step-up transformer, direct current collection Bus positive pole-DC Bus +, direct current collection Bus negative pole-DC Bus-, low voltage alternating current Bus-LV AC Bus, medium/high voltage alternating current Bus-M/HV AC Bus.

Detailed Description

In order to enable those skilled in the art to better understand the technical solution of the present application, a wave power generation multi-source input electric energy conversion system provided by the present application is further described in detail below with reference to the accompanying drawings and the detailed description.

Aiming at the defects that the capacity of the wave power generation single-source input unit is small and the main wiring structure form and the grid-connected operation requirement are not considered, the main wiring structure of the array-distributed multi-source input wave power generation electric energy conversion system is optimally designed from three aspects of a power generation rectification module, a collection inversion module and a boosting grid-connected module, and influence factors such as sea wave conditions, installed capacity and generator set array form are comprehensively considered to provide main wiring optimal schemes under three different application scenes so as to solve the problem that the existing single-source input wave power generation platform cannot give consideration to the main wiring flexibility and grid-connected reliability of the multi-source input electric energy conversion system.

Referring to fig. 1 to 7, in this embodiment, the wave power generation multi-source input electric energy conversion system may include: the power generation rectification module, the collection inversion module and the boosting grid-connected module are connected in sequence.

The power generation rectification module comprises a power generation unit, a rectification unit and a measurement protection unit which are sequentially connected, and is used for converting irregular alternating current generated by the wave power generator set into stable direct current;

the collection inversion module comprises a measurement protection unit and an inversion unit which are connected in sequence and is used for inverting the direct current;

the boost grid-connected module comprises a boost transformer and a measurement protection unit and is used for boosting the inverted voltage;

the multiple machines share one step-up transformer to perform step-up processing on the alternating current passing through the inversion unit, and the wiring mode can be single-bus main wiring, single-bus subsection main wiring or star-shaped main wiring. Specifically, the method comprises the following steps:

as shown in fig. 1, fig. 1 is a single-bus main wiring structure diagram of the multi-source input electric energy conversion system for wave power generation according to the present application. The method is characterized in that a single-bus main wiring mode is adopted, multi-source input wave power generation rectification branches (n in total) are collected to a direct current collection bus in a parallel mode, and finally electric energy is transmitted to shore for grid connection through a submarine cable by high-voltage alternating current through an inversion branch and a boosting grid-connected branch.

The layout structure is simple, the investment cost is low, and the reliability is not high. Although when a certain power generation branch circuit has a fault, the fault branch circuit can be cut off and other power generation rectification branch circuits can keep in a normal operation state only by actuating the branch circuit breaker and the disconnecting switch of the corresponding branch circuit, when the direct current collection bus or the inversion boosting power transmission branch circuit has a fault, all the wave power generator sets connected with the direct current collection bus are shut down, and at the moment, the wave power generation platform can only be subjected to power failure maintenance. Therefore, the main wiring mode is suitable for a wave power generation field with stable sea wave conditions, small installed capacity and short offshore distance, so that the later maintenance cost and workload are reduced.

As shown in fig. 2 and 7, fig. 2 is a structure diagram of a single bus segment main wiring of the multi-source input electric energy conversion system for wave power generation according to the present application; fig. 7 is a direct current collection buscouple circuit breaker structure diagram of a wave power generation multi-source input electric energy conversion system according to the present application. The method is characterized in that a single-bus segmented main connection mode is adopted, power generation rectifying branches (n generator sets, namely n power generation rectifying branches, are connected in parallel on each segmented bus) on each segmented bus are collected on a direct current collecting bus in a parallel mode, each segmented direct current collecting bus is connected through a bus-connected circuit breaker branch, the communication state switching among the segmented buses is realized by controlling the on-off state of an isolating switch and the bus-connected circuit breaker, each segmented direct current collecting bus inverts direct current into alternating current low voltage through an independent inversion branch and collects the alternating current low voltage on a low voltage alternating current bus, and finally, the alternating current low voltage direct current collecting bus is boosted through a boosting grid-connected branch to transmit power to the shore and grid-connected.

It should be noted that, because the input end of the step-up transformer adopts an alternating current collection form, the DC/AC inverter of the inverting branch should have a function of synchronously regulating and controlling the phase, amplitude and waveform of the alternating current output by each inverting branch, so as to meet the synchronous requirement of alternating current collection.

The single-bus sectional connection mode and the single-bus connection mode are different in that when a direct current collection bus or an inversion branch circuit breaks down, the outage range can be reduced, only the branch circuit on the side of the broken sectional bus needs to be broken, and at the moment, the system can still maintain certain electric energy transmission capacity to the outside. Because each section bus is connected by the bus tie breaker, each power generation branch circuit is required to be distributed as compactly as possible in order to reduce the construction cost, in addition, each section bus can be controlled to independently run or jointly run in the system running process, and the working state of each section bus is controlled to ensure that the wave power generation device can also keep certain running reliability in the scene with larger sea area wave condition change, namely, the single-bus section main connection mode is suitable for the scene with larger sea area wave condition change, medium installed capacity and more uniform and compact array distribution of each generator set in a left-right or front-back bidirectional array distribution.

As shown in fig. 3, fig. 3 is a star main wiring structure diagram of the multi-source input power conversion system for wave power generation according to the present application; in order to prevent the whole network outage situation when the inversion branches are in fault, the star main connection mode adopts a connection mode that segmented bus direct currents are converged to a direct current convergence bus, are converged to a low-voltage alternating current bus through independent inversion branches and are finally boosted to high-voltage power transmission grid connection, and the star main connection mode has the same function of synchronously regulating and controlling the phase, amplitude and waveform of alternating voltage output by each inversion branch as the single-bus segmented DC/AC inverter.

The star main connection is characterized in that the independence among all branches is high, a non-standby connection mode is generally adopted, when a certain branch device breaks down, the corresponding branch is cut off, the power supply reliability is slightly higher than that of a single bus connection mode and a single bus sectional connection mode, and the investment cost is correspondingly higher. Compared with a single-bus connection mode, the star connection mode has the advantages that a star structure is introduced into an inversion collection link, the risk of system outage when the inversion link fails is reduced, and the power supply reliability and stability of a power generation system are improved; the main connection structure of the bus-bar section is different from that of a single-bus section main connection structure in that the mode is not used for connecting bus-bar circuit breaker branches of the section buses, and each section bus can only be in an independent working state, so that power failure maintenance is not needed when the bus-bar circuit breaker fails, and the bus-bar circuit breaker has higher independence. Namely, the main wiring form is suitable for a triangular array layout form with frequent seawater flow direction change, large wave condition change and dense distribution of each multi-source input power generation branch.

Different main wiring schemes have advantages and disadvantages, and are determined according to analysis of the aspects of the size, the operation reliability, the economy and the like of a power generation field, and the characteristics of the preferred method provided by the application are shown in the following table:

table 1 main wiring preferred method comparison

In the above, different main wiring schemes of the present application are introduced, and the following sections of the system module are specifically introduced:

the power generation rectification module is connected with the direct current collection bus through the power generation unit, the rectification unit and the measurement protection unit; the collection inversion module is connected with the low-voltage alternating current bus through the measurement protection unit and the inversion unit; and the boosting grid-connected module is connected with the medium-high voltage alternating current bus through a boosting transformer and a measurement protection unit.

1) Power generation rectification module

The rectifying unit is used for converting irregular alternating current generated by the wave power generator set into stable direct current. Each single-source generating set is connected to a direct-current collecting bus in parallel through an AC/DC rectifier, wherein the voltage of the direct-current collecting bus is selected to prevent the voltage distortion of the direct-current collecting bus and the voltage fluctuation of a grid-connected point, and the same type of offshore wind power device can be referred to.

As shown in fig. 4, fig. 4 is a structure diagram of a power generation rectification module of the wave power generation multi-source input electric energy conversion system of the present application. The power generation rectification module comprises a permanent magnet direct-drive generator, an AC/DC rectifier, a current transformer, a live display, a lightning arrester, a grounding switch, an isolating switch, a handcart type circuit breaker and other measurement protection units which play a role in measurement and protection.

The handcart type circuit breaker 101 is connected with the output end of the permanent magnet generator, and the lower end of the handcart type circuit breaker 101 is connected with the alternating current input end of the AC/DC rectifier through a current transformer 106; the live displays 103, 107 are used for reading the readings of the voltage transformer 102 and the current transformer 106 respectively.

When the current transformer 106 monitors that the branch circuit is in overcurrent, the handcart type circuit breaker 101 disconnects the power generation rectifying branch circuit, and when the voltage transformer 102 monitors that the branch circuit is in overvoltage, the lightning arrester 104 realizes overvoltage protection on the output branch circuit of the generator; the DC output end of the AC/DC rectifier is respectively connected to a positive DC collecting bus and a negative DC collecting bus through a handcart type breaker 108 and isolating switches 114 and 115, the output current of the AC/DC rectifier is measured through single-phase current transformers 113 and 116 which are connected with the positive DC collecting bus and the isolating switches 114 and 115 in parallel, readings are displayed in real time through live- wire displays 112 and 117, and branch overvoltage protection is realized through a lightning arrester 110 which is connected with the lower end of the handcart type breaker in parallel.

2) Collection inversion module

At present, the output electric energy of the power generation rectifying branch of the wave power generation device is collected in an alternating current collection mode and a direct current collection mode, but the alternating current collection mode has high requirements on branch voltage, frequency and phase, and the direct current collection mode only needs to require direct current collection bus voltage, so that the direct current collection mode is adopted in the embodiment.

The inverter unit may include a DC/AC inverter; as shown in fig. 5, fig. 5 is a structural diagram of a direct current collecting and inverting module of the multi-source input electric energy conversion system for wave power generation according to the present application. The DC/AC inverter DC input end is connected with the DC collection bus through a primary fuse, a handcart type breaker and an isolating switch, lightning arresters 205 and 209 playing a role of overvoltage protection are connected in parallel at the primary fuses 206 and 208, current transformers 203 and 211 for measuring single-phase branch current, live displays 204 and 210 for displaying the indication number of the current transformers and grounding switches 202 and 212 for protecting and overhauling; the AC output end of the inverter is connected with a low-voltage AC bus through a current transformer and a breaker, and a lightning arrester 215 which plays a role of overvoltage protection, a grounding switch 216 for protecting maintenance and an electrified display 214 for displaying the indication number of the current transformer are connected in parallel with a connecting branch of the upper end of the breaker 217 and the output end of the current transformer 213.

3) Boost grid-connected module

The boost grid-connected module aims at boosting the inverted low-voltage alternating voltage, a generator set of the existing ocean power generation device generally adopts a one-machine-one-variable mode, namely, one generator corresponds to one transformer, but because the capacity of the generator set of the existing wave power generation device is relatively small, the complexity of the offshore environment and the corresponding operation and maintenance cost in the later period are considered, the embodiment adopts a mode that multiple machines share one transformer to boost the alternating voltage collected by an inverter; in addition, because the current multi-source input wave power generation platform is relatively close to the island or offshore, and the alternating current transmission mode system is relatively simple in structure, mature in technology, high in reliability and low in cost, the power transmission mode that alternating current transmission goes to the shore after boosting is adopted in the embodiment.

As shown in fig. 6, fig. 6 is a structure diagram of a boost grid-connected module of the wave power generation multi-source input electric energy conversion system of the present application. The boosting grid-connected module comprises a handcart type circuit breaker, a boosting transformer, a voltage transformer, a current transformer, an electrified display, a lightning arrester and a grounding switch.

The low-voltage side of the step-up transformer 304 is connected with a low-voltage alternating current bus through a current transformer 302 and a handcart type circuit breaker 301, and the low-voltage side branch current is measured by the current transformer 302 and displayed by a live display 305; the high-voltage side of the step-up transformer 304 is connected with a high-voltage alternating current bus through a current transformer 308 and a handcart type circuit breaker 309, overvoltage protection of the step-up transformer is achieved by means of an arrester 307 which is connected with a high-voltage side output branch in parallel, and meanwhile overcurrent protection of the step-up output branch is achieved through cooperation of the current transformer 308 and the handcart type circuit breaker 309.

It should be noted that the power generation rectification module may include a plurality of power generation rectification branches, the collection inversion module may include a plurality of collection inversion branches, but the boosting grid-connected module includes only one boosting grid-connected branch.

In conclusion, compared with the main wiring technology of the existing wave power generation single-source input electric energy conversion system, the main wiring structure of the wave power generation multi-source input electric energy conversion system is optimized from three links of the power generation rectification module, the collection inversion module and the boosting grid-connected module, and corresponding measurement and protection measures are designed for all branches; meanwhile, three different main wiring optimal schemes of a single-bus main wiring form, a single-bus segmented main wiring form and a star-shaped main wiring form are provided by comprehensively considering the conditions of the wave power generation device such as working sea wave conditions, offshore distances and power supply reliability, so that the method is suitable for array distribution layout and the main wiring form in different application scenes, and the power supply reliability and grid connection stability of the wave power generation multi-source input electric energy conversion system in different application scenes are improved.

It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. In addition, for convenience of description, only a part of structures related to the present application, not all of the structures, are shown in the drawings. The step numbers used herein are also for convenience of description only and are not intended as limitations on the order in which the steps are performed. 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.

The terms "first", "second", etc. in this application are used to distinguish different objects, and are not used to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. A wave power generation multi-source input electric energy conversion system is characterized by comprising: the power generation rectification module, the collection inversion module and the boosting grid-connected module are sequentially connected;

the power generation rectification module comprises a power generation unit, a rectification unit and a measurement protection unit which are sequentially connected, and is used for converting irregular alternating current generated by the wave power generator set into stable direct current;

the collection inversion module comprises a measurement protection unit and an inversion unit which are connected in sequence and is used for inverting the direct current;

the boosting grid-connected module comprises a boosting transformer and a measurement protection unit and is used for boosting the inverted voltage;

the boosting transformer is shared by multiple machines to boost the alternating current passing through the inversion unit, and the wiring mode is single-bus main wiring, single-bus sectional main wiring or star-shaped main wiring.

2. A wave power generation multi-source input power conversion system according to claim 1,

in the power generation rectification module, the measurement protection unit comprises a current transformer, a live display, a lightning arrester, a grounding switch, an isolating switch and a handcart type circuit breaker.

3. A wave power generation multi-source input power conversion system according to claim 2,

in the power generation rectifying module, the power generation unit is a permanent magnet direct drive generator, and the rectifying unit is an AC/DC rectifier.

4. A wave power generation multi-source input power conversion system according to claim 3,

the handcart type circuit breaker (101) is connected with the output end of the permanent magnet generator, and the lower end of the handcart type circuit breaker (101) is connected with the alternating current input end of the AC/DC rectifier through a current transformer (106); the live displays (103, 107) are respectively used for reading the readings of the voltage transformer (102) and the current transformer (106).

5. A wave power generation multi-source input power conversion system according to claim 4,

when a current transformer (106) monitors that a branch circuit is in overcurrent, a handcart type circuit breaker (101) disconnects a power generation rectifying branch circuit to realize overcurrent protection, and meanwhile, when a voltage transformer (102) monitors that the branch circuit is in overvoltage, an arrester (104) realizes overvoltage protection on an output branch circuit of a generator;

the direct current output end of the AC/DC rectifier is respectively connected to a direct current collection bus through a handcart type circuit breaker (108) and isolating switches (114, 115), the output current of the AC/DC rectifier is measured through single-phase current transformers (113, 116) which are connected with the direct current collection bus and the isolating switches (114, 115) in parallel, readings are displayed in real time through electrified displays (112, 117), and branch overvoltage protection is realized through a lightning arrester (110) which is connected with the lower end of the handcart type circuit breaker in parallel.

6. A wave power generation multi-source input power conversion system according to claim 5, characterized in that

The inversion unit comprises a DC/AC inverter; the DC input end of the DC/AC inverter is connected with a DC collection bus through a primary fuse, a handcart type circuit breaker and an isolating switch;

wherein, the primary fuses (206, 208), the lightning arresters (205, 209) playing the role of overvoltage protection, the current transformers (203, 211) for measuring the current of the single-phase branch circuit, the live displays (204, 210) for displaying the indication number of the current transformers and the grounding switches (202, 212) for protecting and overhauling are connected in parallel; the AC output end of the DC/AC inverter is connected with a low-voltage AC bus through a current transformer (213) and a handcart type circuit breaker (217), and a lightning arrester (215) which has an overvoltage protection function, a grounding switch (216) for protecting and overhauling and an electrified display (214) for displaying the indication number of the current transformer are connected in parallel by a connecting branch between the upper end of the handcart type circuit breaker (217) and the output end of the current transformer (213).

7. A wave power generation multi-source input power conversion system according to claim 6,

the boosting grid-connected module comprises a handcart type circuit breaker, a boosting transformer, a voltage transformer, a current transformer, a live display, a lightning arrester and a grounding switch.

8. A wave power generation multi-source input power conversion system according to claim 7,

the low-voltage side of the step-up transformer (304) is connected with a low-voltage alternating current bus through a current transformer (302) and a handcart type circuit breaker (301), and the current of a branch circuit at the low-voltage side is measured by the current transformer (302) and displayed by a charged display (305);

the high-voltage side of the step-up transformer (304) is connected with a high-voltage alternating current bus through a current transformer (308) and a handcart type circuit breaker (309), overvoltage protection on the step-up transformer (304) is realized by utilizing a lightning arrester (307) connected with a high-voltage side output branch in parallel, and meanwhile overcurrent protection of the step-up output branch is realized through the cooperation of the current transformer (308) and the handcart type circuit breaker (309).

9. A wave power generation multi-source input power conversion system according to claim 8,

the multi-source input wave power generation rectification branch is collected to a direct current collection bus in a parallel connection mode, and finally electric energy is transmitted to shore for grid connection through an alternating current through a submarine cable through an inversion branch and a boosting grid connection branch.

10. A wave power generation multi-source input power conversion system according to claim 9,

the input end of the step-up transformer adopts an alternating current collection form, and the DC/AC inverter of the inversion branch circuits has the function of synchronously regulating and controlling the phase, amplitude and waveform of alternating current voltage output by each inversion branch circuit so as to meet the synchronous requirement of alternating current collection.

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