CN112483305B - Electric energy conversion system and control method of wave energy power generation device - Google Patents
Electric energy conversion system and control method of wave energy power generation device Download PDFInfo
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- CN112483305B CN112483305B CN202011347515.0A CN202011347515A CN112483305B CN 112483305 B CN112483305 B CN 112483305B CN 202011347515 A CN202011347515 A CN 202011347515A CN 112483305 B CN112483305 B CN 112483305B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
- F03B13/22—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the flow of water resulting from wave movements to drive a motor or turbine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2220/00—Application
- F05B2220/70—Application in combination with
- F05B2220/706—Application in combination with an electrical generator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The application discloses an electric energy conversion system and a control method of a wave energy power generation device.
Description
Technical Field
The application relates to the technical field of wave energy power generation, in particular to an electric energy conversion system and a control method of a wave energy power generation device.
Background
Wave energy is one of the ocean energies, produced by the wave motion of the ocean surface, consisting of the kinetic energy produced by the motion of mass points in the fluctuating water and the potential energy possessed by the vertical displacement of the wave surface relative to the mean water surface. The wave energy power generation can partially replace the diesel power generation of the deep and far sea islands, provides reproducible clean electric energy for the islands, and assists the development and construction of the deep and far sea islands.
Waves are a random periodic motion, so that wave energy power generation has strong intermittency and instability. In order to realize the random and intermittent decoupling of electric energy and wave energy, a hydraulic energy storage link is usually added to a wave energy power generation device in the wave energy-electric energy conversion process, so that a hydraulic energy conversion system is formed. In the existing wave energy power generation device adopting the link of wave energy-hydraulic energy-electric energy conversion, the system reliability and the adaptability to the severe marine environment of the power generation device are emphasized, the automatic control technology of each level of the energy conversion system is still required to be improved, and particularly the controllability of the energy conversion process and the stability and controllability of electric energy output of an electric energy conversion system of the wave energy power generation device are required to be further improved.
Disclosure of Invention
The application provides an electric energy conversion system and a control method of a wave energy power generation device, which are used for effectively improving the controllability of the energy conversion process of the electric energy conversion system of the wave energy power generation device and the stability and controllability of electric energy output.
In view of this, the present application provides, in a first aspect, an electric energy conversion system for a wave energy power generation device, including a hydraulic energy storage device, a hydraulic motor set, a generator set, a rectifier set, a grid-connected inverter, a step-up transformer, a lithium battery energy storage device, and an electric energy conversion system controller;
the hydraulic energy storage device is connected with the hydraulic motor group through a hydraulic main pipe, hydraulic motors of the hydraulic motor group are connected with generators of the generator set in a one-to-one correspondence mode, the generators of the generator set are connected with rectifiers of the rectifier group in a one-to-one correspondence mode, the rectifier group is connected with the grid-connected inverter through a direct current bus, the grid-connected inverter is connected with the step-up transformer, the high-voltage side of the step-up transformer is connected with the island micro-grid through a submarine cable, the input end of the lithium battery energy storage device is connected with the direct current bus, and the output end of the lithium battery energy storage device is connected with the low-voltage side of the step-up transformer;
the electric energy conversion system controller is used for receiving a dispatching instruction sent by a power grid dispatching system of the island micro-grid, acquiring a hydraulic value of the hydraulic energy storage device in real time, controlling the hydraulic motor to start to drive the generator to generate power after the hydraulic value reaches a threshold value, monitoring the voltage of the direct current bus, and regulating and controlling the direct current output voltage of the rectifier so as to keep the voltage of the direct current bus stable;
the electric energy conversion system controller is also used for monitoring the voltage of the low-voltage side of the boosting transformer and controlling the output voltage of the grid-connected inverter according to the voltage of the low-voltage side so as to keep the alternating-current voltage stable;
the electric energy conversion system controller is also used for controlling the lithium battery pack of the lithium battery energy storage device to discharge when the electric energy sent by the generator set is insufficient, maintaining the alternating current voltage stability in cooperation with the grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy sent by the generator set is redundant, and maintaining the direct current bus voltage stability in cooperation with the rectifier.
Optionally, the electric energy conversion system controller is further configured to:
when the electric quantity of the lithium battery pack is reduced to a first electric quantity percentage, the lithium battery pack is controlled to stop discharging, when the generator generates electricity, the lithium battery pack is charged preferentially until the electric quantity of the lithium battery pack reaches a second electric quantity percentage, when the electric quantity of the lithium battery pack reaches the second electric quantity percentage, the electricity generated by the generator is conveyed to the step-up transformer, when the electricity generated by the generator is insufficient, the electricity is complemented through the lithium battery energy storage device, and when the electricity generated by the generator is surplus, the lithium battery energy storage device is charged continuously.
Optionally, the first charge percentage is 30%.
Optionally, the second charge percentage is 70%.
Optionally, after the hydraulic value reaches a threshold, controlling the hydraulic motor to start to drive the generator to generate power includes:
when the hydraulic pressure value reaches a first threshold value, starting a first hydraulic motor corresponding to a first generator with first rated power to drive the first generator to generate electricity, wherein in the electricity generation process of the first generator, the hydraulic energy storage device continuously converts wave energy into hydraulic energy;
when the hydraulic pressure value reaches a second threshold value, a second hydraulic motor corresponding to a second generator with a second rated power is started to drive the second generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator and the second generator;
when the hydraulic pressure value reaches a third threshold value, a third hydraulic motor corresponding to a third generator with third rated power is started to drive the third generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator, the second generator and the third generator;
wherein the first threshold is less than the second threshold, which is less than the third threshold.
Optionally, the rectifier group is an IGBT rectifier group.
Optionally, the lithium battery energy storage device includes: the system comprises a DC/DC converter, the lithium battery pack, an energy storage converter and an energy storage system control unit;
the input side of the DC/DC converter is connected with the direct current bus and used for converting the voltage of the direct current bus into a preset voltage level so as to store the electric energy converted from the wave energy into a lithium battery pack;
the output end of the lithium battery pack is connected with the input end of the energy storage converter, the output end of the energy storage converter is connected with the low-voltage side of the boosting transformer, and the electric energy stored in the lithium battery pack is converted to the low-voltage side of the boosting transformer through the energy storage converter;
the energy storage system control unit is used for receiving a control instruction of the electric energy conversion system controller and controlling the DC/DC converter, the lithium battery pack and the energy storage converter according to the control instruction.
A second aspect of the present application provides a method for controlling power conversion of a wave energy power generation device, which is applied to a system for controlling power conversion of a wave energy power generation device according to any one of the first aspect, and includes:
receiving a scheduling instruction sent by a power grid scheduling system of the island micro-grid;
the method comprises the steps of acquiring a hydraulic value of a hydraulic energy storage device in real time, and controlling a hydraulic motor to start to drive a generator to generate power when the hydraulic value reaches a threshold value;
monitoring the voltage of a direct current bus in real time, and regulating and controlling the direct current output voltage of a rectifier so as to maintain the voltage of the direct current bus stable;
monitoring the voltage of the low-voltage side of the step-up transformer in real time, and controlling the output voltage of the grid-connected inverter according to the voltage of the low-voltage side so as to keep the alternating voltage stable;
the method comprises the steps of monitoring the power generation electric energy of a generator set in real time, controlling the lithium battery pack of a lithium battery energy storage device to discharge when the electric energy sent by the generator set is insufficient, maintaining the stability of alternating current voltage by cooperating with a grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy sent by the generator set is redundant, and maintaining the stability of direct current bus voltage by cooperating with a rectifier.
Optionally, the obtaining a hydraulic value of the hydraulic energy storage device in real time, and after the hydraulic value reaches a threshold, controlling the hydraulic motor to start, and driving the generator to generate power includes:
the hydraulic value of the hydraulic energy storage device is obtained in real time;
when the hydraulic pressure value reaches a first threshold value, starting a first hydraulic motor corresponding to a first generator with first rated power to drive the first generator to generate electricity, wherein in the electricity generation process of the first generator, the hydraulic energy storage device continuously converts wave energy into hydraulic energy;
when the hydraulic pressure value reaches a second threshold value, a second hydraulic motor corresponding to a second generator with a second rated power is started to drive the second generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator and the second generator;
when the hydraulic pressure value reaches a third threshold value, a third hydraulic motor corresponding to a third generator with third rated power is started to drive the third generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator, the second generator and the third generator;
wherein the first threshold is less than the second threshold, which is less than the third threshold.
Optionally, the method further comprises:
the electric quantity of real-time supervision lithium battery energy memory's lithium cell group works as when the electric quantity of lithium cell group drops to first electric quantity percentage, control lithium cell group stops to discharge, works as during the generator electricity generation, preferentially to lithium cell group charges, until the electric quantity of lithium cell group reaches second electric quantity percentage, works as the electric quantity of lithium cell group reaches second electric quantity percentage, will the electricity that the generator was sent is carried step up transformer, works as when the electricity energy that the generator was generated is not enough, complements through lithium cell energy memory, works as the electricity energy that the generator was generated has surplus, then continues to charge to lithium cell energy memory.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides an electric energy conversion system of a wave energy power generation device, which comprises a hydraulic energy storage device, a hydraulic motor group, a power generation unit, a rectifier group, a grid-connected inverter, a step-up transformer, a lithium battery energy storage device and an electric energy conversion system controller;
the hydraulic energy storage device is connected with the hydraulic motor group through a hydraulic main pipe, hydraulic motors of the hydraulic motor group are connected with generators of the generator set in a one-to-one correspondence mode, the generators of the generator set are connected with rectifiers of the rectifier group in a one-to-one correspondence mode, the rectifier group is connected with the grid-connected inverter through a direct current bus, the grid-connected inverter is connected with the step-up transformer, the high-voltage side of the step-up transformer is connected with the island micro-grid through a submarine cable, the input end of the lithium battery energy storage device is connected with the direct current bus, and the output end of the lithium battery energy storage device is connected with the low-voltage side of the step-up transformer;
the electric energy conversion system controller is used for receiving a dispatching instruction sent by a power grid dispatching system of the island micro-grid, acquiring a hydraulic value of the hydraulic energy storage device in real time, controlling the hydraulic motor to start to drive the generator to generate power after the hydraulic value reaches a threshold value, monitoring the voltage of the direct current bus, and regulating and controlling the direct current output voltage of the rectifier so as to keep the voltage of the direct current bus stable;
the electric energy conversion system controller is also used for monitoring the voltage of the low-voltage side of the boosting transformer and controlling the output voltage of the grid-connected inverter according to the voltage of the low-voltage side so as to keep the alternating-current voltage stable;
the electric energy conversion system controller is also used for controlling the lithium battery pack of the lithium battery energy storage device to discharge when the electric energy sent by the generator set is insufficient, maintaining the alternating current voltage stability in cooperation with the grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy sent by the generator set is redundant, and maintaining the direct current bus voltage stability in cooperation with the rectifier.
According to the wave energy power generation device electric energy conversion system, the electric energy conversion system controller obtains the dispatching instruction from the island micro-grid, and the hydraulic motor, the rectifier, the grid-connected inverter and the lithium battery energy storage device are cooperatively controlled, so that power matching and voltage stabilization of the whole electric energy conversion system in a power generation period are realized, and the controllability of the energy conversion process of the wave energy power generation device electric energy conversion system and the stability and controllability of electric energy output are effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for a user of ordinary skill in the art, other related drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electric energy conversion system of a wave energy power generation device provided in an embodiment of the present application.
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.
For easy understanding, please refer to fig. 1, an embodiment of an electric energy conversion system of a wave energy power generation device provided by the present application includes a hydraulic energy storage device, a hydraulic motor set, a generator set, a rectifier set, a grid-connected inverter, a step-up transformer, a lithium battery energy storage device, and an electric energy conversion system controller;
the hydraulic energy storage device is connected with a hydraulic motor group through a hydraulic main pipe, hydraulic motors of the hydraulic motor group are connected with generators of a generator set in a one-to-one correspondence mode, the generators of the generator set are connected with rectifiers of the rectifier group in a one-to-one correspondence mode, the rectifier group is connected with a grid-connected inverter through a direct current bus, the grid-connected inverter is connected with a step-up transformer, the high-voltage side of the step-up transformer is connected with an island microgrid through a submarine cable, the input end of the lithium battery energy storage device is connected with the direct current bus, and the output end of the lithium battery energy storage device is connected with the low-voltage side of the step-up transformer;
the electric energy conversion system controller is used for receiving a scheduling instruction sent by a power grid scheduling system of the island micro-grid, acquiring a hydraulic value of the hydraulic energy storage device in real time, controlling a hydraulic motor to start to drive a generator to generate power when the hydraulic value reaches a threshold value, monitoring the voltage of a direct current bus, and regulating and controlling the direct current output voltage of a rectifier so as to keep the voltage of the direct current bus stable;
the electric energy conversion system controller is also used for monitoring the voltage at the low-voltage side of the step-up transformer and controlling the output voltage of the grid-connected inverter according to the voltage at the low-voltage side so as to keep the alternating-current voltage stable;
the electric energy conversion system controller is also used for controlling the lithium battery pack of the lithium battery energy storage device to discharge when the electric energy sent by the generator set is insufficient, maintaining the alternating current voltage stability in cooperation with the grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy sent by the generator set is redundant, and maintaining the direct current bus voltage stability in cooperation with the rectifier.
It should be noted that, as shown in fig. 1, the electric energy conversion system of the wave energy power generation device in the embodiment of the present application is composed of a hydraulic energy storage device, a hydraulic motor group, a generator set, a rectifier group, a dc bus, a grid-connected inverter, a lithium battery energy storage device, a step-up transformer, and an electric energy conversion system controller, where the rectifier of the rectifier group may be an IGBT rectifier, the generator set is formed by combining n generators G1, G2, …, Gn whose rated powers are P1, P2, …, Pn (where P1 is not less than P2 is not less than … is not less than Pn), each generator is driven by 1 corresponding hydraulic motor, and the hydraulic motors are driven by high-pressure hydraulic oil output by the hydraulic energy storage device, and the hydraulic energy storage device is used for converting mechanical energy generated by the wave energy capturing device under the action of waves into hydraulic energy to be stored. The alternating current output end of each generator is connected with a corresponding IGBT rectifier, the IGBT rectifiers convert alternating current generated by the generators into direct current, and the direct current sides of the IGBT rectifiers are converged through a direct current bus. The direct current bus is connected with the plurality of IGBT rectifiers, and is also connected with a direct current input side of the grid-connected inverter and a direct current input side of the lithium battery energy storage device. The direct current side of the grid-connected inverter is connected with the direct current bus, the alternating current side of the grid-connected inverter is connected with the low-voltage side of the step-up transformer, the grid-connected inverter converts the direct current of the direct current bus into alternating current, and the alternating current voltage level is improved to 10kV through the step-up transformer. The lithium battery energy storage device is composed of a DC/DC converter, a lithium battery pack, an energy storage converter and an energy storage system control unit, wherein the direct current input side of the lithium battery energy storage device is connected with a direct current bus, and the voltage of the direct current bus is converted into a proper voltage grade through the DC/DC converter, so that the electric energy converted by wave energy is stored in the lithium battery pack. And the alternating current output side of the lithium battery energy storage device is connected with the low-voltage side of the step-up transformer. The low-voltage side of the step-up transformer is connected with the alternating current side of the grid-connected inverter and is also connected with the alternating current output side of the lithium battery energy storage device, and the high-voltage side of the step-up transformer is connected with the submarine cable. The step-up transformer increases the voltage grade of the alternating current output side of the grid-connected inverter and the lithium battery energy storage device to 10kV, and the electric energy is transmitted to the island micro-grid through the submarine cable. The electric energy conversion system controller obtains a dispatching instruction from a power grid dispatching system of the island micro-grid, and power matching and voltage stabilization of the whole electric energy conversion system in one power generation period of the wave energy device are achieved by cooperatively controlling the hydraulic motor, the rectifier, the grid-connected inverter and the lithium battery energy storage device.
According to the wave energy power generation device electric energy conversion system provided by the embodiment of the application, the electric energy conversion system controller obtains the dispatching instruction from the island micro-grid, and the hydraulic motor, the rectifier, the grid-connected inverter and the lithium battery energy storage device are cooperatively controlled, so that the power matching and the voltage stabilization of the whole electric energy conversion system in the power generation period are realized, and the controllability of the energy conversion process and the stability and the controllability of the electric energy output of the wave energy power generation device electric energy conversion system are effectively improved.
Further, the generating set in the embodiment of the application adopts a mode of generating power in echelon. Setting n hydraulic thresholds for the hydraulic value of the hydraulic energy storage device, wherein a first threshold K1 is smaller than a second threshold K2 is smaller than … and is smaller than an nth threshold Kn, starting a hydraulic motor corresponding to a generator G1 with rated power of P1 when the hydraulic value in the hydraulic energy storage device reaches the first threshold K1, driving the generator G1 to generate electricity, and continuously converting wave energy into hydraulic energy by the hydraulic energy storage device in the electricity generation process of the generator G1; when the hydraulic pressure value in the hydraulic energy storage device reaches a second threshold value K2, a hydraulic motor corresponding to a generator G2 with the rated power of P2 is started to drive the generator G2 to generate electricity, in the electricity generation process of the generator G1 and the generator G2, the hydraulic energy storage device continuously converts wave energy into hydraulic energy, and when the hydraulic pressure value in the hydraulic energy storage device reaches a third threshold value K3, a hydraulic motor corresponding to a generator G3 with the rated power of P3 is started to drive a generator G3 to generate electricity. By analogy, the mode of generating power in echelon is adopted, so that the wave energy power generation device can generate power effectively under small waves, medium waves and large waves, and the flexible matching of wave conditions and generated power is realized. In a specific application, the generator set can be formed by combining 3 generators G1, G2 and G3 with the rated power of 50kW, 100kW and 150kW respectively. The hydraulic energy storage device is provided with 3 hydraulic thresholds which are respectively 20Mpa, 35Mpa and 50 Mpa. In a power generation period of the wave power generation device, the generator set adopts a mode of generating power in an echelon mode: when the hydraulic pressure value in the hydraulic energy storage device reaches a first threshold value of 20Mpa, starting a hydraulic motor corresponding to a generator G1 with the rated power of 50kW, and driving a generator G1 to generate electricity; in the power generation process of the generator G1, if the hydraulic pressure value reaches the second threshold value of 35Mpa, starting a hydraulic motor corresponding to the generator G2 with the rated power of 100kW to drive the generator G2 to generate power; in the power generation process of the generators G1 and G2, if the hydraulic pressure value reaches the third threshold value 50Mpa, the hydraulic motor corresponding to the generator with the rated power of 150kW is started, and the generator G3 is driven to generate power.
The electric energy conversion system controller receives the electric power dispatching instruction from the island micro-grid dispatching system, acquires the hydraulic value of the hydraulic energy storage device in real time, and when the pressure value reaches a threshold value, the electric energy conversion system controller sends a starting instruction to the control unit of the hydraulic motor to drive the generator to generate electricity. The electric energy conversion system controller also monitors the voltage of the direct current bus, and regulates and controls the direct current output voltage of the rectifier through the control unit of the rectifier to maintain the stability of the voltage of the direct current bus. The electric energy conversion system controller also monitors the voltage of the low-voltage side of the step-up transformer, and the stabilization of the alternating voltage is realized through the control unit of the grid-connected inverter. When the electric energy generated by the generator set is insufficient, the electric energy conversion system controller controls the lithium battery energy storage device to discharge through the energy storage device control unit, and maintains the stability of the alternating voltage in cooperation with the grid-connected inverter; when the electric energy generated by the generator set is redundant, the electric energy conversion system controller controls the lithium battery energy storage device to charge through the energy storage device control unit, and maintains the voltage stability of the direct current bus in cooperation with the rectifier. In specific application, when the electric quantity of the lithium battery energy storage device is reduced to 30%, the lithium battery energy storage device stops discharging, and under the condition, when the generator generates electricity, the lithium battery energy storage device is charged preferentially until the electric quantity of the lithium battery energy storage device reaches 70%; when the electric quantity of the lithium battery energy storage device reaches 70%, the electricity generated by the generator is transmitted to the island micro-grid. When the power generated by the generator is insufficient, the energy storage device of the lithium battery supplements the power; when the generator generates surplus energy, the energy storage device is continuously charged.
The application also provides an embodiment of a wave energy power generation device power conversion control method, which is applied to a wave energy power generation device power conversion control system in the embodiment of the wave energy power generation device power conversion control system, and comprises the following steps:
receiving a scheduling instruction sent by a power grid scheduling system of the island micro-grid;
the method comprises the steps of acquiring a hydraulic value of a hydraulic energy storage device in real time, and controlling a hydraulic motor to start to drive a generator to generate power when the hydraulic value reaches a threshold value;
monitoring the voltage of the direct current bus in real time, and regulating and controlling the direct current output voltage of the rectifier so as to maintain the voltage of the direct current bus stable;
monitoring the voltage of the low-voltage side of the step-up transformer in real time, and controlling the output voltage of the grid-connected inverter according to the voltage of the low-voltage side so as to keep the alternating voltage stable;
the method comprises the steps of monitoring the power generation electric energy of a generator set in real time, controlling the lithium battery pack of the lithium battery energy storage device to discharge when the electric energy sent by the generator set is insufficient, maintaining the alternating current voltage stability in cooperation with a grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy sent by the generator set is redundant, and maintaining the direct current bus voltage stability in cooperation with a rectifier.
Further, obtain the hydraulic pressure value of hydraulic pressure energy storage equipment in real time, after the hydraulic pressure value reaches the threshold value, control hydraulic motor and start, drive generator electricity generation, include:
acquiring a hydraulic value of a hydraulic energy storage device in real time;
when the hydraulic pressure value reaches a first threshold value, starting a first hydraulic motor corresponding to a first generator with first rated power to drive the first generator to generate electricity, wherein in the electricity generation process of the first generator, a hydraulic energy storage device continuously converts wave energy into hydraulic energy;
when the hydraulic pressure value reaches a second threshold value, a second hydraulic motor corresponding to a second generator with second rated power is started to drive the second generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator and the second generator;
when the hydraulic pressure value reaches a third threshold value, a third hydraulic motor corresponding to a third generator with third rated power is started to drive the third generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator, the second generator and the third generator;
the first threshold is smaller than the second threshold, and the second threshold is smaller than the third threshold.
The electric quantity of real-time supervision lithium battery energy memory's lithium cell group, when the electric quantity of lithium cell group drops to first electric quantity percentage, control lithium cell group stop discharge, when the generator electricity generation, preferentially to lithium cell group charge, the electric quantity of organizing until lithium cell reaches second electric quantity percentage, the electric quantity of organizing when lithium cell reaches second electric quantity percentage, carry the step up transformer with the electricity that the generator sent, when the electricity energy that the generator produced is not enough, complement through lithium cell energy memory, it can have surplus when the electricity energy that the generator produced, then continue to charge to lithium cell energy memory.
The effect of the method for controlling the electric energy conversion of the wave energy power generation device provided in the embodiment of the application is consistent with that of the electric energy conversion system of the wave energy power generation device, and is not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. 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 (8)
1. The electric energy conversion system of the wave energy power generation device is characterized by comprising a hydraulic energy storage device, a hydraulic motor group, a power generator group, a rectifier group, a grid-connected inverter, a step-up transformer, a lithium battery energy storage device and an electric energy conversion system controller;
the hydraulic energy storage device is connected with the hydraulic motor group through a hydraulic main pipe, hydraulic motors of the hydraulic motor group are connected with generators of the generator set in a one-to-one correspondence mode, the generators of the generator set are connected with rectifiers of the rectifier group in a one-to-one correspondence mode, the rectifier group is connected with the grid-connected inverter through a direct current bus, the grid-connected inverter is connected with the step-up transformer, the high-voltage side of the step-up transformer is connected with the island micro-grid through a submarine cable, the input end of the lithium battery energy storage device is connected with the direct current bus, and the output end of the lithium battery energy storage device is connected with the low-voltage side of the step-up transformer;
the electric energy conversion system controller is used for receiving a dispatching instruction sent by a power grid dispatching system of the island micro-grid, acquiring a hydraulic value of the hydraulic energy storage device in real time, controlling the hydraulic motor to start to drive the generator to generate power after the hydraulic value reaches a threshold value, monitoring the voltage of the direct current bus, and regulating and controlling the direct current output voltage of the rectifier so as to keep the voltage of the direct current bus stable;
the electric energy conversion system controller is also used for monitoring the voltage of the low-voltage side of the boosting transformer and controlling the output voltage of the grid-connected inverter according to the voltage of the low-voltage side so as to keep the alternating-current voltage stable;
the electric energy conversion system controller is also used for controlling the lithium battery pack of the lithium battery energy storage device to discharge when the electric energy generated by the generator set is insufficient, maintaining the alternating current voltage to be stable in cooperation with the grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy generated by the generator set is redundant, and maintaining the direct current bus voltage to be stable in cooperation with the rectifier;
the power conversion system controller is further configured to:
when the electric quantity of the lithium battery pack is reduced to a first electric quantity percentage, the lithium battery pack is controlled to stop discharging, when the generator generates electricity, the lithium battery pack is charged preferentially until the electric quantity of the lithium battery pack reaches a second electric quantity percentage, when the electric quantity of the lithium battery pack reaches the second electric quantity percentage, the electricity generated by the generator is conveyed to the step-up transformer, when the electricity generated by the generator is insufficient, the electricity is complemented through the lithium battery energy storage device, and when the electricity generated by the generator is surplus, the lithium battery energy storage device is charged continuously.
2. The wave power generation device power conversion system of claim 1, wherein the first percentage of electrical quantity is 30%.
3. The wave energy power plant electric energy conversion system of claim 2, wherein the second percentage of electrical energy is 70%.
4. The wave energy power generation device electric energy conversion system according to claim 1, wherein after the hydraulic pressure value reaches a threshold value, the hydraulic motor is controlled to start to drive the generator to generate electricity, and the method comprises the following steps:
when the hydraulic pressure value reaches a first threshold value, starting a first hydraulic motor corresponding to a first generator with first rated power to drive the first generator to generate electricity, wherein in the electricity generation process of the first generator, the hydraulic energy storage device continuously converts wave energy into hydraulic energy;
when the hydraulic pressure value reaches a second threshold value, a second hydraulic motor corresponding to a second generator with a second rated power is started to drive the second generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator and the second generator;
when the hydraulic pressure value reaches a third threshold value, a third hydraulic motor corresponding to a third generator with third rated power is started to drive the third generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator, the second generator and the third generator;
wherein the first threshold is less than the second threshold, which is less than the third threshold.
5. The wave power generation device power conversion system of claim 1, wherein the rectifier bank is an IGBT rectifier bank.
6. The wave energy generation device power conversion system of claim 1, wherein the lithium battery energy storage device comprises: the system comprises a DC/DC converter, the lithium battery pack, an energy storage converter and an energy storage system control unit;
the input side of the DC/DC converter is connected with the direct current bus and used for converting the voltage of the direct current bus into a preset voltage level so as to store the electric energy converted from the wave energy into a lithium battery pack;
the output end of the lithium battery pack is connected with the input end of the energy storage converter, the output end of the energy storage converter is connected with the low-voltage side of the boosting transformer, and the electric energy stored in the lithium battery pack is converted to the low-voltage side of the boosting transformer through the energy storage converter;
the energy storage system control unit is used for receiving a control instruction of the electric energy conversion system controller and controlling the DC/DC converter, the lithium battery pack and the energy storage converter according to the control instruction.
7. A wave energy power generation device power conversion control method, characterized in that the wave energy power generation device power conversion control method is applied to the wave energy power generation device power conversion control system of any one of claims 1 to 6, and comprises:
receiving a scheduling instruction sent by a power grid scheduling system of the island micro-grid;
the method comprises the steps of acquiring a hydraulic value of a hydraulic energy storage device in real time, and controlling a hydraulic motor to start to drive a generator to generate power when the hydraulic value reaches a threshold value;
monitoring the voltage of a direct current bus in real time, and regulating and controlling the direct current output voltage of a rectifier so as to maintain the voltage of the direct current bus stable;
monitoring the voltage of the low-voltage side of the step-up transformer in real time, and controlling the output voltage of the grid-connected inverter according to the voltage of the low-voltage side so as to keep the alternating voltage stable;
monitoring the generated electric energy of a generator set in real time, controlling the lithium battery pack of a lithium battery energy storage device to discharge when the electric energy generated by the generator set is insufficient, maintaining the alternating current voltage to be stable in cooperation with the grid-connected inverter, controlling the lithium battery pack of the lithium battery energy storage device to charge when the electric energy generated by the generator set is redundant, and maintaining the direct current bus voltage to be stable in cooperation with the rectifier;
the electric quantity of real-time supervision lithium battery energy memory's lithium cell group works as when the electric quantity of lithium cell group drops to first electric quantity percentage, control lithium cell group stops to discharge, works as during the generator electricity generation, preferentially to lithium cell group charges, until the electric quantity of lithium cell group reaches second electric quantity percentage, works as the electric quantity of lithium cell group reaches second electric quantity percentage, will the electricity that the generator was sent is carried step up transformer, works as when the electricity energy that the generator was generated is not enough, complements through lithium cell energy memory, works as the electricity energy that the generator was generated has surplus, then continues to charge to lithium cell energy memory.
8. The method for controlling the electric energy conversion of the wave energy power generation device according to claim 7, wherein the step of acquiring the hydraulic value of the hydraulic energy storage device in real time, and controlling the hydraulic motor to start to drive the generator to generate electricity after the hydraulic value reaches a threshold value comprises the following steps:
the hydraulic value of the hydraulic energy storage device is obtained in real time;
when the hydraulic pressure value reaches a first threshold value, starting a first hydraulic motor corresponding to a first generator with first rated power to drive the first generator to generate electricity, wherein in the electricity generation process of the first generator, the hydraulic energy storage device continuously converts wave energy into hydraulic energy;
when the hydraulic pressure value reaches a second threshold value, a second hydraulic motor corresponding to a second generator with a second rated power is started to drive the second generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator and the second generator;
when the hydraulic pressure value reaches a third threshold value, a third hydraulic motor corresponding to a third generator with third rated power is started to drive the third generator to generate electricity, and the hydraulic energy storage device continuously converts wave energy into hydraulic energy in the electricity generation process of the first generator, the second generator and the third generator;
wherein the first threshold is less than the second threshold, which is less than the third threshold.
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