CN103321845A - Offshore floating grid-connected wind-wave power generation method and device - Google Patents

Abstract

The invention discloses an offshore floating wind power and wave energy hybrid grid-connected power generation method and device. The device includes a wind generator, an offshore floating platform, a power converter, a wave energy generator, a fixed anchor chain for the offshore floating platform, and a fixed pillar for the stator of the wave energy generator. The wind turbine is installed on the top of the offshore floating platform, and the wave energy The generator is installed in the tower at the lower end of the offshore floating platform, the wave energy generator adopts a linear generator, the power converter is installed in the offshore floating platform, and is connected with the wind power generator and the wave energy generator respectively; The fixed anchor chain of the floating platform fixes the offshore floating platform, and the stator fixing pillar of the wave energy generator is used for fixing the stator of the wave energy generator. Wind power generators and wave energy generators generate electric energy under the action of wind energy and wave energy, and the electric energy is transferred to the shore power grid system by cables after being transformed by the power converter; the device of the present invention has simple structure, high working efficiency, and high practical value .

Description

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

technical field

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

Background technique

With the wide application of new energy technology, new energy power generation technology is moving from land to sea. Compared with land, there is a more stable and abundant wind field at sea, and it is not affected by terrain. Moreover, there are huge wave energy resources in the sea, and the utilization of wave energy has become one of the current research hotspots. Traditional offshore new energy power generation systems are often fixed on the seabed through column structures. Due to the high cost, this method is not suitable for remote sea areas with higher energy reserves. The 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, and the electric energy storage and transmission technology of the offshore power generation system is one of the constraints that restrict the utilization of offshore energy. Key factor. Therefore, it is very necessary to study a set of offshore floating wind and wave energy hybrid grid-connected power generation methods and devices in practical industrial applications. the

Contents of the invention

The purpose of the present invention is to address the deficiencies in the prior art, and propose a hybrid grid-connected power generation method for offshore floating wind and wave energy, which utilizes the advantages of flexible installation and wide application of the floating platform, and adds a set of wave energy power generation devices to improve The utilization rate of the system is improved; the present invention also provides a device for realizing the method, which has simple structure, high practical value and simple structure, which promotes the industrial application of the power generating device. the

The method of the present invention adopts concrete technical scheme as follows:

A hybrid grid-connected power generation method of offshore floating wind power and wave energy, characterized in that: the wind power generator and the wave energy generator are installed on the offshore floating platform at the same time, and the offshore floating platform is fixed by anchor chains; the wind power generator and the The wave energy generator generates electric energy under the action of wind energy and wave energy, and the electric 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:

The device includes a wind generator, an offshore floating platform, a power converter, a wave energy generator, a fixed anchor chain for the offshore floating platform, and a fixed pillar for the stator of the wave energy generator. The wind turbine is installed on the top of the offshore floating platform, and the wave energy The generator is installed in the tower at the lower end of the offshore floating platform, the wave energy generator adopts a linear generator, the power converter is installed in the offshore floating platform, and is connected with the wind power generator and the wave energy generator respectively; The fixed anchor chain of the floating platform fixes the offshore floating platform, and the stator fixing pillar of the wave energy generator is used for fixing the stator of the wave energy generator.

The power converter includes a wind power generation rectifier circuit, a wave energy power generation rectification circuit, a grid-connected inverter circuit, a PWM controller and a drive circuit; The rectifier circuit for power 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 grid-connected inverter circuit, the output terminal of the grid-connected inverter circuit is connected to the grid, the grid voltage sensor is connected in parallel to the grid, and the output of the grid-connected inverter The voltage sensor is connected in parallel to the three-phase output terminal of the grid-connected inverter circuit, the output signals of the grid-connected inverter output voltage sensor and the grid voltage sensor pass through the PWM controller, and the DSP chip (using TMS320F2812) in the PWM controller calculates 3 groups Independent PWM signal, each group of 2 complementary PWM signals, provides driving signals for the 6 IGBTs of the grid-connected inverter circuit, and the 6 IGBTs of the grid-connected inverter circuit are driven by the IGBT drive circuit to make the grid-connected inverter circuit generate grid voltage. the

The process in which the power converter converts the electrical energy generated by the wind generator and the wave energy generator into grid-connected electrical energy is realized in this way. When the wind generator and the wave energy generator generate electrical energy under the action of wind energy and wave energy, the electrical energy After being rectified by the wind power rectifier circuit and the wave energy rectifier circuit respectively, the DC side voltage of the grid-connected inverter circuit is kept constant, and the grid voltage sensor detects U _a *, U _b *, U _c * of the three-phase voltage of the grid, and the grid The inverter output voltage sensor detects U _a , U _b , U _c of the output voltage of the inverter circuit, and inputs them into the PWM controller, and the DSP chip in the PWM controller subtracts U from U _a *, U _b *, U _c * _a , U _b , U _c get the output error signals of △ U _a , △ U _b , △ U _c , that is, U _a *, U _b *, U _c * and U _a , U _b , U _c , and output the error signal △ U _a , △ U _b , △ U _c get 3 groups of PWM signals through PID modulation and triangular wave comparison, that is, each group has 2 complementary 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. the

Description of drawings

Figure 1 is a structural diagram of a floating offshore wind and wave energy hybrid grid-connected power generation device;

Fig. 2 is a circuit structure diagram of a power converter in an offshore floating wind and wave energy hybrid grid-connected power generation device;

Figure 3 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. the

Figures 1 to 3 show a specific embodiment of a floating offshore wind and wave energy hybrid grid-connected power generation device of the present invention: the implementation method of the offshore floating wind and wave energy hybrid grid-connected power generation device consists of floating power generation The platform, power converter and detection control system are composed of:

Referring to Fig. 1, the device is: including 1. wind generator, 2. offshore floating platform, 3. power converter, 4. wave energy generator, 5. fixed anchor chain of offshore floating platform, 6. wave energy linear The generator stator is fixed to the pillar; the wind power generator 1 is installed on the top of the offshore floating platform 2, the wave energy generator 4 is installed in the tower at the lower end of the offshore floating platform 2, the wave energy generator 4 adopts a linear generator, and the power conversion The device 3 is installed in the offshore floating platform 2, the offshore floating platform fixed anchor chain 5 fixes the offshore floating platform 2, and the wave energy linear generator stator fixing pillar 6 is used to fix the wave energy linear generator stator.

The method is as follows: when the wind blades of the wind power generator rotate under the action of wind force, the wind power generator is driven to rotate and generate electric energy; The floating platform swings up and down under the action of wave energy, relative motion occurs between the mover and stator of the linear generator, and the wave energy generator generates electric energy; the offshore floating platform is fixed by anchor chains to keep it stationary in the horizontal direction. the

See Figure 2, the circuit is: including 7. wind power generation rectification circuit, 8. wave energy generation rectification circuit, 9. 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 terminal is connected to wind power generation rectification circuit 7, wave energy generator 4 output terminal is connected to wave power generation rectification circuit 8, wind power generation rectification circuit 7 and wave power generation rectification circuit 8 is connected in parallel to the DC side of the grid-connected inverter circuit 9, the output terminal of the grid-connected inverter circuit 9 is connected to the grid, the grid voltage sensor 11 is connected in parallel to the grid, and the grid-connected inverter output voltage sensor 10 is connected in parallel to the grid-connected inverter circuit 9, the output signals of the grid-connected inverter output voltage sensor 10 and the grid voltage sensor 11 generate IGBT drive signals through the PWM controller 12 . the

The method is as follows: when the wind power generator 1 and the wave energy generator 4 generate electric energy under the action of wind energy and wave energy, the electric energy is respectively rectified by the wind power generation rectifier circuit 7 and the wave energy generation rectifier circuit 8 to make the grid-connected inverter circuit The DC side voltage of 9 is constant; the output terminal of the grid-connected inverter circuit 9 is connected to the grid, the grid voltage sensor 11 is connected in parallel to the grid, and the grid-connected inverter output voltage sensor 10 is connected in parallel to the three-phase output terminal of the grid-connected inverter circuit 9 , 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 3 groups of independent PWM signals, each group of 2 complementary PWM signals, Provide driving signals for the six IGBTs of the grid-connected inverter circuit 9 , and the six IGBTs of the grid-connected inverter circuit 9 are driven by the IGBT drive circuit 13 to make the grid-connected inverter circuit 9 generate a grid-connected voltage. the

Referring to Fig. 3, Fig. 3 is an implementation method of a control strategy for an offshore floating wind and wave energy hybrid grid-connected power generation device. The grid voltage sensor 11 detects U _a *, U _b *, and U _c * of the three-phase voltage of the grid, and The grid inverter output voltage sensor 10 detects the U _a , U _b , U _c of the inverter circuit output voltage, which is input to the PWM controller 12, and the DSP chip in the PWM controller 12 uses U _a *, U _b *, U _c *Subtract U _a , U _b , U _c to get △ U _a , △ U _b , △ U _c , that is, the output error signal of U _a *, U _b *, U _c * and U _a , U _b , U _c , output The error signals △ U _a , △ U _b , △ U _c are compared with PID modulation and triangular wave to obtain 3 groups of PWM signals, that is, 2 complementary PWM signals in each group.

The present invention adopts TI company's TMS320F2812 chip as the main chip of the PWM controller. The DSP chip TMS320F2812 has two PWM modules, and each module can output six independent PWM signals, which can meet the needs of three independent PWM control signals of the device. the

Claims (5)

1. A method for hybrid grid-connected power generation of offshore floating wind power and wave energy, characterized in that: wind power generators and wave energy generators are installed on the offshore floating platform simultaneously, and the offshore floating platform is fixed by anchor chains; wind power generation Generators and wave energy 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. 2. The device for implementing a hybrid grid-connected power generation method for offshore floating wind and wave energy as claimed in claim 1, characterized in that the device includes a wind generator (1), an offshore floating platform (2), and a power converter (3), wave energy generator (4), offshore floating platform fixed anchor chain (5) and wave energy generator stator fixed pillar (6), wind power generator (1) is installed on the offshore floating platform (2) At the top, the wave energy generator (4) is installed in the tower at the lower end of the offshore floating platform (2), the wave energy generator (4) adopts a linear generator, and the power converter (3) is installed on the offshore floating platform (2), and respectively connected with the wind power generator (1) and the wave energy generator (4); the anchor chain (5) of the offshore floating platform fixes the offshore floating platform (2), and the stator of the wave energy generator The pillar (6) is used to fix the stator of the wave energy generator. 3. An offshore floating wind and wave energy hybrid grid-connected power generation device according to claim 2, characterized in that: the power converter (3) includes a wind power generation rectifier circuit (7), a wave energy generation rectifier circuit (8), grid-connected inverter circuit (9), PWM controller (12) and drive circuit (13); wind power generator (1) output terminal connected to wind power generation rectifier circuit (7), wave energy generator (4) The output terminal is connected to the rectifier circuit for wave energy generation (8), the rectifier circuit for wind power generation (7) and the rectifier circuit for wave energy generation (8) are connected in parallel to the DC side of the grid-connected inverter circuit (9), and the grid-connected inverter circuit (9) The output terminal of the grid is connected to the grid, the grid voltage sensor (11) is connected in parallel to the grid, the grid-connected inverter output voltage sensor (10) is connected in parallel to the three-phase output terminal of the grid-connected inverter circuit (9), and the grid-connected inverter outputs The output signals of the 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 3 sets of independent PWM signals, each with 2 complementary PWM signals , to provide driving signals for the six IGBTs of the grid-connected inverter circuit (9), and the six IGBTs of the grid-connected inverter circuit (9) are driven by the IGBT drive circuit (13) to make the grid-connected inverter circuit (9) generate parallel grid voltage. 4. An offshore floating wind and wave energy hybrid grid-connected power generation device according to claim 3, characterized in that: when the wind power generator (1) and the wave energy generator (4) are under the influence of wind energy and wave energy When generating electric energy, the electric energy is respectively rectified by wind power generation rectification circuit (7) and wave energy generation rectification circuit (8), so that the DC side voltage of the grid-connected inverter circuit (9) is constant, and the grid voltage sensor (11) detects the grid Three-phase voltage, grid-connected inverter output voltage The sensor (10) detects the output voltage of the inverter circuit, and inputs it to the PWM controller (12), and the DSP chip in the PWM controller (12) obtains the grid three-phase voltage and inverter The output error signal of the output voltage of the variable circuit, the output error signal is obtained by PID modulation and triangular wave comparison to obtain 3 groups of PWM signals. 5. An offshore floating wind and wave energy hybrid grid-connected power generation device according to claim 3 or 4, characterized in that: said DSP chip is TMS320F2812.

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