CN103629051A - Deep ocean floating type wind power and wave energy hybrid grid-connected power generation method and device - Google Patents

Abstract

The invention discloses a deep ocean floating type wind power and wave energy hybrid grid-connected power generation method and device. The deep ocean floating type wind power and wave energy hybrid grid-connected power generation device comprises an offshore floating type platform, a wind driven generator, sea snake type wave energy generators, power converters, offshore floating type platform fixing anchor chains and sea snake type generator fixing anchor chains, wherein the wind driven generator is installed on the offshore floating type platform, the offshore floating type platform is fixed to a seabed through the offshore floating type platform fixing anchor chains, the four sea snake type wave energy generators are placed on the sea surface nearby the offshore floating type platform, and are fixed to the seabed through the sea snake type generator fixing anchor chains, and the power converters are installed in the offshore floating type platform, and is connected with the wind driven generator and the four sea snake type wave energy generators. The wind driven generator and the sea snake type wave energy generators generate electric energy under the action of wind power and wave energy, and the electric energy is transmitted to a shore grid system through a cable after being converted through the power converters. The deep ocean floating type wind power and wave energy hybrid grid-connected power generation device is simple in structure and high in working efficiency, and has high practical value.

Description

A hybrid grid-connected power generation method and device for offshore deep-sea floating wind power and wave energy

technical field

The invention relates to a deep-sea floating wind power and wave energy hybrid grid-connected power generation method and device, which belongs to the structural technology of floating offshore comprehensive power generation devices.

Background technique

With the gradual consumption of non-renewable fuels such as oil and coal, people are paying more and more attention to the utilization of marine energy, and the wind energy and wave energy on the ocean have huge utilization space and are also non-polluting. Environmentally friendly energy. Offshore wind power generation is a new form of energy with strategic significance, and the development of offshore wind power generation from pile type in shallow sea to floating type in deep sea is an inevitable trend of its development. Offshore floating wind power generation technology only uses wind power as a single new energy power generation technology, so the utilization rate of the entire floating power generation system is not high. Key factor. As one of the most abundant energy sources in marine energy, wave energy is also the focus of ocean energy research and development in various countries. The "Sea Serpent" (Pelamis) wave energy power generation device developed by the British Ocean Power Transmission Company consists of several cylindrical steel shell structural units. It is hinged to convert wave energy into hydraulic energy and then generate electricity. Therefore, it is of great significance to study a set of hybrid grid-connected power generation device composed of offshore floating wind power generation and several "sea snake" generators in practical industrial applications.

Contents of the invention

The purpose of the present invention is to solve the problem of the single function of the existing ocean wind power generation technology, and propose a method for hybrid grid-connected power generation of offshore deep-sea floating wind power and wave energy, which utilizes the advantages of wide application and flexible installation of the floating platform, and adds A set of wave energy power generation device composed of 4 "sea snake" generators improves the utilization rate of the system; the invention also provides a device for realizing the method, which has a simple structure and high practical value, and promotes the application of the power generation device in the industry. on the application.

The concrete technical scheme that the present invention adopts is as follows:

A hybrid grid-connected power generation method of offshore deep-sea floating wind power and wave energy: the wind power generator is installed on the offshore floating platform, and multiple "sea snake" wave energy generators are placed on the sea surface near the offshore floating platform, which can accept different Direction of wave energy; wind generators and "Sea Snake" generators generate electrical energy under the action of wind energy and wave energy, and the electrical energy is transformed by a power converter and then transmitted to the onshore power grid system by cables.

Device of the present invention adopts specific technical scheme as follows:

An offshore deep-sea floating wind and wave energy hybrid grid-connected power generation device, including a wind generator, an offshore floating platform, a power converter, and a "sea snake" generator; the wind generator is installed on the top of the offshore floating platform , the offshore floating platform is fixed on the seabed through anchor chains, the "Sea Snake" generator is fixed on the seabed through fixed anchor chains, the power converter is installed in the offshore floating platform, and is connected to the wind turbine and the "Sea Snake" The generator is electrically connected.

The number of the "Sea Serpent" generators is 4.

The power converter includes a rectifier circuit for wind power generation, a rectifier circuit for wave power generation, a three-level grid-connected inverter circuit, a PWM controller, and a drive circuit; The output ends of the generators are respectively connected to the rectifier circuit for wave energy generation, the rectifier circuit for wind power generation and the rectifier circuit for wave energy generation are connected in parallel on the DC side of the three-level grid-connected inverter circuit, and the output end of the three-level grid-connected inverter circuit is connected to the power grid. The output voltage sensor of the level grid-connected inverter is connected in parallel to the three-phase output end of the grid-connected inverter circuit, and the grid voltage sensor is connected in parallel in the grid. The output signals of the output voltage sensor of the three-level grid-connected inverter and the grid voltage sensor pass through PWM controller, the DSP chip in the PWM controller (using TMS320F28335) calculates 6 sets of independent PWM signals, and each set of 2 complementary PWM signals provides driving signals for 12 IGBTs of the three-level grid-connected inverter circuit, The 12 IGBTs of the three-level grid-connected inverter circuit are driven by the IGBT driving circuit to make the three-level grid-connected inverter circuit generate a grid-connected voltage.

The process that the power converter converts the electric energy generated by the wind turbine and the "Sea Snake" generator into grid-connected electric energy is realized in this way. When the wind turbine and the "Sea Snake" generator generate When the electric energy is generated, the electric energy is respectively rectified by the wind power generation rectification circuit and the wave energy generation rectification circuit to make the DC side voltage of the grid-connected inverter circuit constant, and the output voltage sensor of the three-level grid-connected inverter detects the U of the output voltage of the inverter circuit. _a , U _b , U _c , grid voltage sensor detects U _a *, U _b *, U _c * of grid three-phase voltage, input to PWM controller, DSP chip in PWM controller uses U _a *, U _b * , U _c * minus U _a , U _b , U _c to get △ U _a , △ U _b , △ U _c that is the output error between U _a * , U _b * , U _c * and U _a , U _b , U _c Signal, the output error signals △ U _a , △ U _b , △ U _c are adjusted by PID and compared with 2 groups of upper and lower stacked triangle waves with the same frequency and amplitude to obtain 6 groups of PWM signals, and each group generates 2 complementary PWM signals signal, a total of 12 PWM signals.

The invention can improve the utilization rate of the floating power generation system by combining the wind power generation and the wave energy generation device, realize the simple structure of the device, high working efficiency and high practical value.

Description of drawings

Fig. 1 is a front view of an offshore deep-sea floating wind and wave energy hybrid grid-connected power generation device;

Fig. 2 is a top view of an offshore deep-sea floating wind and wave energy hybrid grid-connected power generation device;

Fig. 3 is a circuit structure diagram of a power converter in an offshore deep-sea floating wind and wave energy hybrid grid-connected power generation device;

Fig. 4 is a structure diagram of a PWM control and drive circuit of a power converter in an offshore deep-sea floating wind and wave energy hybrid grid-connected power generation device;

Figure 5 is a schematic diagram of the control strategy.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the examples and accompanying drawings. The examples are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

Figures 1 to 5 show a specific implementation of a deep-sea floating wind and wave energy hybrid grid-connected power generation device of the present invention: the realization method of the deep-sea deep-sea floating wind and wave energy hybrid grid-connected power generation device consists of floating Composition of type power generation platform, power converter and detection and control system:

Referring to Figure 1 and Figure 2, the device is: including 1. Wind generator, 2. Offshore floating platform, 3. Power converter, 4. "Sea snake" generator, 5. Fixed anchor chain of offshore floating platform, 6. "Sea Serpent" generator fixed anchor chain. The wind power generator 1 is installed on the top of the offshore floating platform 2, and four "sea snake" generators 4 are placed on the sea surface near the offshore floating platform 2, so as to be able to receive wave energy in different directions. The fixed anchor chain 6 of the "sea snake" generator is fixed, the power converter 3 is installed in the offshore floating platform 2, and the offshore floating platform 2 is fixed by the fixed anchor chain 5 of the offshore floating platform.

The power generation method of this method is: when the wind blades of the wind power generator 1 rotate under the action of wind force, the wind power generator is driven to rotate and generate electric energy; the wave energy generator is a "sea snake" type generator, and whenever a wave passes by, " The cylinder of the "Sea Snake" generator will rise and fall with the waves like the body of a sea snake. The up and down movement and sideways movement of the joints will push the hydraulic piston of the cylinder to reciprocate, press the hydraulic oil from the middle of the engine, and drive the generator Power generation; the "sea snake" generator is fixed by anchor chains, keeping its horizontal direction relatively static; the offshore floating platform 2 is fixed by anchor chains 5, keeping its horizontal direction relatively static.

See Figure 3 and Figure 4, the circuit is: including 7. wind power generation rectification circuit, 8. wave energy generation rectification circuit, 9. three-level grid-connected inverter circuit, 10. grid-connected inverter output voltage sensor, 11 Grid voltage sensor, 12. PWM controller, 13. IGBT drive circuit; wind power generator 1 output end is connected to wind power generation rectification circuit 7, output ends of 4 "sea snake" generators are respectively connected to wave power generation rectification circuit 8, The wind power generation rectifier circuit 7 and the wave power generation rectifier circuit 8 are connected in parallel on the DC side of the three-level grid-connected inverter circuit 9, the output terminal of the three-level grid-connected inverter circuit 9 is connected to the power grid, and the three-level grid-connected inverter The output voltage sensor 10 is connected in parallel to the three-phase output terminal of the three-level grid-connected inverter circuit 9, the grid voltage sensor 11 is connected in parallel in the grid, and the output signals of the grid-connected inverter output voltage sensor 10 and the grid voltage sensor 11 are controlled by PWM Device 12 generates IGBT driving signals.

The grid-connected power generation method of this method is: when the wind power generator 1 and the four "sea snake" generators 4 generate electric energy under the action of wind energy and wave energy, the electric energy passes through the wind power generation rectifier circuit 7 and the wave power generation rectifier circuit 8 respectively. After rectification, the DC side voltage of the three-level grid-connected inverter circuit 9 is kept constant; the output terminal of the three-level grid-connected inverter circuit 9 is connected to the grid, and the grid-connected inverter output voltage sensor 10 is connected in parallel to the grid-connected inverter circuit 9 The grid voltage sensor 11 is connected in parallel in the grid, and the output signals of the grid-connected inverter output voltage sensor 10 and the grid voltage sensor 11 pass through the PWM controller 12, and the DSP chip in the PWM controller 12 calculates 6 groups Independent PWM signals, two complementary PWM signals in each group, provide driving signals for 12 IGBTs of the three-level grid-connected inverter circuit 9, and the 12 IGBTs of the three-level grid-connected inverter circuit 9 are driven by the IGBT drive circuit 13 The operation of the IGBT makes the three-level grid-connected inverter circuit 9 generate a grid-connected voltage.

Referring to Fig. 5, Fig. 5 is an implementation method of a control strategy for a deep-sea floating wind and wave energy hybrid grid-connected power generation device. The grid-connected inverter output voltage sensor 10 detects U _a , U a of the inverter circuit output voltage _b , U _c , grid voltage sensor 11 detects U _a *, U _b *, U _c * of grid three-phase voltage, input PWM controller 12, DSP chip in PWM controller 12 uses U _a *, U _b * , U _c * minus U _a , U _b , U _c to get △ U _a , △ U _b , △ U _c that is the output error between U _a * , U _b * , U _c * and U _a , U _b , U _c Signal, the output error signal △ U _a , △ U _b , △ U _c is modulated by PID and compared with 2 groups of upper and lower stacked triangle waves with the same frequency and amplitude to obtain 6 groups of PWM signals, and each group generates 2 complementary PWM signals signal, a total of 12 PWM signals.

The present invention adopts TI company's TMS320F28335 chip as the main chip of the PWM controller. The DSP chip TMS320F28335 has 6 independent PWM modules, and each module can generate 2 PWM signals, which can meet the needs of 12 PWM control signals of the device.

Claims (6)

1. deep-sea, ocean floating wind-force and wave energy mix the method for generating electricity by way of merging two or more grid systems, it is characterized in that: wind-driven generator is arranged on floating platform on sea, many " sea snake " formula wave energy generators are positioned near the sea of floating platform on sea, can accept the wave energy of different direction; Wind-driven generator and " sea snake " formula generator send electric energy under the effect of wind energy and wave energy, after electric energy converts by power inverter by cable transfer network system ashore.

2. realize the device that a kind of ocean as claimed in claim 1 deep-sea floating wind-force and wave energy mix the method for generating electricity by way of merging two or more grid systems, it is characterized in that: device comprises wind-driven generator (1), floating platform on sea (2), power inverter (3) and " sea snake " formula generator (4); Described wind-driven generator (1) is arranged on the top of floating platform on sea (2), floating platform on sea (2) is fixed on sea bed by anchor chain (5), " sea snake " formula generator (4) is fixed on sea bed by fixing anchor chain (6), power inverter (3) is arranged in floating platform on sea (2), and is electrically connected with wind-driven generator (1) and " sea snake " formula generator (4) respectively.

3. a kind of ocean according to claim 2 deep-sea floating wind-force and wave energy mix the device that generates electricity by way of merging two or more grid systems, and it is characterized in that, the quantity of described " sea snake " formula generator (4) is 4.

4. according to deep-sea, a kind of ocean floating wind-force described in claim 2 or 3 and wave energy, mix the device that generates electricity by way of merging two or more grid systems, it is characterized in that: described power inverter (3) comprises wind-power electricity generation rectification circuit (7), wave-energy power generation rectification circuit (8), three level grid-connected inverter circuits (9), PWM controller (12) and drive circuit (13); wind-driven generator (1) output terminal connects wind-power electricity generation rectification circuit (7), " sea snake " formula generator (4) output termination wave-energy power generation rectification circuit (8), wind-power electricity generation rectification circuit (7) and wave-energy power generation rectification circuit (8) are connected in parallel on the DC side of three level grid-connected inverter circuits (9), the output terminal of three level grid-connected inverter circuits (9) gets access to grid, three level grid-connected inverter output voltage sensors (10) are connected in parallel on the three-phase output end of grid-connected inverter circuit (9), line voltage sensor (11) is connected in parallel in electrical network, the output signal input PWM controller (12) of three level grid-connected inverter output voltage sensors (10) and line voltage sensor (11), dsp chip in PWM controller (12) calculates 6 groups of independently pwm signals, every group of 2 complementary pwm signals, 12 IGBT that are three level grid-connected inverter circuits (9) provide driving signal, by IGBT drive circuit (13), drive 12 IGBT work of three level grid-connected inverter circuits (9) to make three level grid-connected inverter circuits (9) produce grid-connected voltage.

5. a kind of ocean according to claim 4 deep-sea floating wind-force and wave energy mix the device that generates electricity by way of merging two or more grid systems, it is characterized in that: when wind-driven generator (1) and " sea snake " formula generator (4) send electric energy under the effect of wind energy and wave energy, electric energy passes through respectively wind-power electricity generation rectification circuit (7), after wave-energy power generation rectification circuit (8) rectification, make the DC voltage of grid-connected inverter circuit (9) constant, three level grid-connected inverter output voltage sensors (10) detect inverter circuit output voltage, line voltage sensor (11) detects electrical network three-phase voltage, be input to PWM controller (12), dsp chip in PWM controller (12) obtains the output error signal of electrical network three-phase voltage and inverter circuit output voltage after processing, output error signal regulates through PID and the up and down triangle wave of lamination identical with amplitude with two class frequencys obtains 6 groups of pwm signals, every group produces respectively 2 complementary pwm signals, totally 12 pwm signals.

6. a kind of ocean according to claim 4 deep-sea wind-force and wave energy mix the device that generates electricity by way of merging two or more grid systems, and it is characterized in that: described dsp chip is TMS320F28335.

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