Wind-light-fire bundled power generation adjusting system based on distributed phase modifier

Abstract

The utility model relates to the technical field of power generation regulation, and discloses a wind-solar-thermal bundled power generation regulation system based on distributed phase modifiers, which comprises a power generation end, the power generation end comprises a wind power generation system, a photovoltaic power generation system and a thermal power generation system, and the regulation system further comprises a plurality of distributed phase modifiers and a central controller. The output ends of the wind power generation system, the photovoltaic power generation system and the thermal power generation system are electrically connected with the direct-current power transmission system through an alternating-current bus, the direct-current power transmission system is electrically connected with the receiving-end alternating-current system, and the distributed phase modifier is connected between the wind power generation system and the alternating-current bus and between the photovoltaic power generation system and the alternating-current bus. The central controller drives the distributed phase modifier to change the magnitude and direction of the output reactive power of the wind power generation system / photovoltaic power generation system so as to maintain the stability of the AC bus voltage, so that the stability problem of the new energy base wind-solar-thermal bundled DC delivery system can be effectively solved, and the system has a good application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of bundled power generation regulation, in particular to a wind-solar-thermal bundled power generation regulation system based on a distributed synchronous condenser. Background Art

[0002] New energy power generation technologies represented by wind and solar can replace traditional fossil energy power generation technologies. Large-scale new energy power generation bases have been built in the "Three-North" regions of China with rich wind and solar resources, and clean energy is transmitted to load centers through long-distance HVDC transmission systems. Although the grid connection of large-scale new energy power generation bases can significantly improve the supply level of clean energy, the new energy power generation system based on power electronics technology cannot provide the inertia and short-circuit capacity of traditional synchronous generators, resulting in the continuous decline of the inertia and short-circuit capacity of the power system, and the transient voltage support and regulation ability also weakens accordingly. When a fault disturbance occurs, it faces severe voltage stability problems, seriously threatening the safe and stable operation of the power system.

[0003] A synchronous condenser is a synchronous generator in a special operating state. As a common reactive power compensation device, the synchronous condenser has the advantages of fast tracking speed, wide compensation range, and low failure rate. It can perform dynamic reactive power compensation through excitation current control, has fast subtransient output capacity and strong excitation capacity during the transient process. At the same time, as a rotating device, the synchronous condenser can also provide short-circuit capacity and moment of inertia for the system, increase the equivalent synchronous inertia of the system, and improve the dynamic frequency response of the system. The synchronous condensers currently in use include centralized synchronous condensers and distributed synchronous condensers. Compared with centralized synchronous condensers, distributed synchronous condensers have the characteristics of small capacity and inertia and short electrical distance from the new energy power generation system, and have a more significant impact on the grid connection stability of new energy power generation. At present, there is no solution to apply distributed synchronous condensers to new energy power stations to improve voltage stability. Summary of the Utility Model

[0004] Aiming at the above-mentioned prior art, the utility model aims to provide a wind-solar-thermal bundled power generation regulation system based on a distributed synchronous condenser, mainly solving the technical problems existing in the above background art.

[0005] To achieve the above object, the technical solution of the embodiment of the utility model is realized as follows:

[0006] The utility model discloses a wind-solar-thermal bundled power generation regulation system based on a distributed synchronous condenser, which includes a power generation end. The power generation end includes a wind power generation system, a photovoltaic power generation system, and a thermal power generation system. The regulation system further includes a plurality of distributed synchronous condensers and a central controller. The output ends of the wind power generation system, the photovoltaic power generation system, and the thermal power generation system are electrically connected to a DC power transmission system through an AC bus. The DC power transmission system is electrically connected to a receiving-end AC system. The distributed synchronous condensers are connected between the wind power generation system, the photovoltaic power generation system and the AC bus. The central controller drives the distributed synchronous condensers to change the magnitude and direction of the reactive power output by the wind power generation system / photovoltaic power generation system.

[0007] Optionally, a sensing component is connected between the DC power transmission system and the receiving-end AC system. The sensing component is signal-connected to a relay protection device. The central controller is respectively signal-connected to the distributed synchronous condensers and the relay protection device. The central controller drives the distributed synchronous condensers based on the output signal of the relay protection device to change the magnitude and direction of the reactive power output by the wind power generation system / photovoltaic power generation system.

[0008] Optionally, the output ends of the wind power generation system, the photovoltaic power generation system, and the thermal power generation system are electrically connected to the AC bus through step-up transformers.

[0009] Optionally, the distributed synchronous condensers are connected between the wind power generation system, the photovoltaic power generation system and the step-up transformers.

[0010] Optionally, the sensing component includes a voltage transformer and a current transformer. The voltage transformer and the current transformer are both signal-connected to the relay protection device.

[0011] Optionally, a displacement sensor, an axial vibration sensor, and a radial vibration sensor are provided on the distributed synchronous condenser. The displacement sensor, the axial vibration sensor, and the radial vibration sensor are all signal-connected to the central controller.

[0012] Optionally, the displacement sensor is arranged at the outer shell of the distributed synchronous condenser.

[0013] Optionally, the axial vibration sensor and the radial vibration sensor are arranged at the rotor of the distributed synchronous condenser.

[0014] The beneficial effects of the present utility model are as follows: A wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser disclosed in this application connects distributed synchronous condensers to the wind power generation system and the photovoltaic power generation system respectively according to the electrical topology and operating characteristics of the wind-solar-thermal integrated DC external transmission system. When a system fault disturbance occurs, the distributed synchronous condenser adjusts the magnitude and direction of the reactive power of the grid-connected branches of the wind power generation and photovoltaic power generation respectively according to the system fault characteristics to maintain the stability of the AC bus voltage, which can effectively solve the stability problem of the wind-solar-thermal integrated DC external transmission system of the new energy base and has good application prospects.

[0015] Secondly, in the embodiment of the present utility model, vibration detection is also performed on the distributed synchronous condenser, which can not only effectively ensure the safe and stable operation of the equipment, but also improve the reliability and economy of the overall power system. Description of the Drawings

[0016] Figure 1 It is a structural schematic diagram of the wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser in the embodiment of this application;

[0017] Figure 2 It is a working flow chart of the distributed synchronous condenser group in the embodiment of this application;

[0018] Figure 3 It is a functional module block diagram in Embodiment 1 of this application;

[0019] Figure 4 It is a module block diagram for vibration detection of the distributed synchronous condenser in Embodiment 2 of this application.

[0020] Explanation of the Reference Numerals in the Drawings:

[0021] 1. Wind power generation system; 2. Photovoltaic power generation system; 3. Thermal power generation system; 4. Distributed synchronous condenser; 5. Central controller; 6. Step-up transformer; 7. AC bus; 8. DC transmission system; 9. Receiving-end AC system; 10. Voltage transformer; 11. Current transformer; 12. Relay protection equipment; 13. Displacement sensor; 14. Axial vibration sensor; 15. Radial vibration sensor. Detailed Embodiment

[0022] The technical solution of the present utility model will be further elaborated in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. In the following description, the expression "some embodiments" is involved, which describes a subset of all possible embodiments. However, it should be understood that "some embodiments" may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0023] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present utility model, some technical features well known in the art are not described.

[0024] It should be understood that the present utility model can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present utility model to those skilled in the art. And the purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present utility model. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. When used herein, the term "and / or" includes any and all combinations of the related listed items.

[0025] It should be further noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "inner", "outer", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0026] To thoroughly understand the present utility model, detailed structures will be presented in the following description to illustrate the technical solutions proposed by the present utility model. The optional embodiments of the present utility model are described in detail as follows. However, in addition to these detailed descriptions, the present utility model may also have other implementation manners.

[0027] Embodiment 1

[0028] Please refer to the attached Figures 1 - 3 This application provides a wind-solar-thermal bundled power generation regulation system based on a distributed synchronous condenser 4, including a power generation end. The power generation end includes a wind power generation system 1, a photovoltaic power generation system 2, and a thermal power generation system 3. The regulation system further includes a plurality of distributed synchronous condensers 4 and a central controller 5. The output ends of the wind power generation system 1, the photovoltaic power generation system 2, and the thermal power generation system 3 are electrically connected to a DC power transmission system 8 through an AC bus 7. The DC power transmission system 8 is electrically connected to a receiving-end AC system 9. The distributed synchronous condensers 4 are connected between the wind power generation system 1, the photovoltaic power generation system 2 and the AC bus 7. The central controller 5 drives the distributed synchronous condensers 4 to change the magnitude and direction of the output reactive power of the wind power generation system 1 / photovoltaic power generation system 2.

[0029] During the implementation process of the present utility model, power generation is respectively carried out by the wind power generation system 1, the photovoltaic power generation system 2, and the thermal power generation system 3. The obtained electric energy is bundled and output through the AC bus 7 and is transmitted to the receiving-end AC system 9 by the DC power transmission system 8. During this transmission process, if the central controller 5 receives a signal instruction of a fault disturbance occurring in the DC power transmission system 8, it drives the corresponding distributed synchronous condenser 4 to act, so that the rotor excitation current of the distributed synchronous condenser 4 changes, and then the magnitude and direction of the output reactive power are changed. Finally, the magnitude and direction of the reactive power of the wind power generation grid-connected branch / photovoltaic power generation grid-connected branch are adjusted to improve the voltage stability of the DC external transmission system.

[0030] In a possible implementation manner, a sensing component is connected between the DC power transmission system 8 and the receiving-end AC system 9. The sensing component is signal-connected to a relay protection device 12. The central controller 5 is respectively signal-connected to the distributed synchronous condenser 4 and the relay protection device 12. The central controller 5 drives the distributed synchronous condenser 4 based on the output signal of the relay protection device 12 to change the magnitude and direction of the output reactive power of the wind power generation system 1 / photovoltaic power generation system 2.

[0031] Specifically, electrical parameter data including current parameters and voltage parameters in the HVDC transmission system 8 is obtained through the sensing component. The relay protection device 12 determines whether a fault disturbance occurs based on the foregoing electrical parameter data. If a fault disturbance occurs, the central controller 5 drives the corresponding distributed synchronous condenser 4 to act based on the control instruction of the relay protection device 12, so that the rotor excitation current of the distributed synchronous condenser 4 changes, thereby changing the magnitude and direction of the output reactive power, and finally adjusting the magnitude and direction of the reactive power of the wind power grid-connected branch / photovoltaic power grid-connected branch to improve the voltage stability of the DC external transmission system.

[0032] Furthermore, both the photovoltaic power generation system 2 and the wind power generation system 1 are distributed power supply systems. The photovoltaic power generation system 2 is arranged in a place with sufficient sunlight to fully receive sunlight and absorb sufficient light intensity to generate more electricity. The photovoltaic power generation system 2 includes a small and medium-sized photovoltaic power generation system 2 with a photovoltaic capacity of 30kW - 500kW and a large photovoltaic power generation system 2 with a photovoltaic capacity greater than 500kW. The specific composition of the above photovoltaic power generation system 2 is common knowledge for those skilled in the art and will not be specifically introduced in this embodiment.

[0033] In an optional implementation manner, the output ends of the wind power generation system 1, the photovoltaic power generation system 2, and the thermal power generation system 3 are electrically connected to the AC bus 7 through a step-up transformer 6. The wind power generation system 1, the photovoltaic power generation system 2, and the thermal power generation system 3 are all conventional power generation systems in the prior art, and their structures will not be specifically described in this embodiment.

[0034] In an optional implementation manner, the distributed synchronous condenser 4 is connected between the wind power generation system 1, the photovoltaic power generation system 2 and the step-up transformer 6, that is, the output end of the wind power generation system 1 is connected to the distributed synchronous condenser 4, and the output end of the photovoltaic power generation system 2 is connected to the distributed synchronous condenser 4.

[0035] In an optional implementation manner, the sensing component includes a voltage transformer 10 and a current transformer 11. The voltage transformer 10 and the current transformer 11 are both signal-connected to the relay protection device 12. The current parameters and voltage parameters in the HVDC transmission system 8 are obtained through the voltage transformer 10 and the current transformer 11, and the relay protection device 12 determines whether a fault disturbance occurs based on the foregoing electrical parameter data.

[0036] In addition, components such as the voltage transformer 10, the current transformer 11, the relay protection device 12, and the central controller 5 are all conventional components in the field of power transmission and transformation. Their structural compositions and models are all common knowledge for those skilled in the art and will not be specifically described in this embodiment.

[0037] Working principle description: Electrical parameter data including current parameters and voltage parameters in the HVDC transmission system 8 is obtained through the sensing component. Its relay protection device 12 determines whether a fault disturbance occurs based on the aforementioned electrical parameter data. If a fault disturbance occurs, the central controller 5 drives the corresponding distributed synchronous condenser 4 based on the control instruction of the relay protection device 12, so that the rotor excitation current of the distributed synchronous condenser 4 changes, thereby changing the magnitude and direction of the output reactive power. For example, by regulating the rotor excitation current of the distributed synchronous condenser 4, the magnitude and direction of the output reactive power are changed, and then the magnitude and direction of the reactive power of the wind power grid-connected branch are adjusted to improve the voltage stability of the DC external transmission system;

[0038] By regulating the rotor excitation current of the distributed synchronous condenser 4, the magnitude and direction of the output reactive power are changed, and then the magnitude and direction of the reactive power of the photovoltaic power grid-connected branch are adjusted to improve the voltage stability of the output of the entire DC external transmission system.

[0039] Embodiment 2

[0040] See Appendix Figure 4 In this embodiment 2, the difference from Embodiment 1 is that a displacement sensor 13, an axial vibration sensor 14, and a radial vibration sensor 15 are provided on the distributed synchronous condenser 4. The displacement sensor 13, the axial vibration sensor 14, and the radial vibration sensor 15 are all connected to the central controller 5 in signal. The vibration signal of the distributed synchronous condenser 4 itself is obtained through the displacement sensor 13, the axial vibration signal of the rotor in the distributed synchronous condenser 4 is obtained through the axial vibration sensor 14, and the radial vibration signal of the rotor in the distributed synchronous condenser 4 is obtained through the radial vibration sensor 15. The central controller 5 analyzes the operating state of the distributed synchronous condenser 4 based on the above three vibration signals. By performing vibration detection on the distributed synchronous condenser 4, not only can the safe and stable operation of the equipment be effectively guaranteed, but also the reliability and economy of the overall power system can be improved.

[0041] It should be noted that the method by which the central controller 5 analyzes the operating state of the distributed synchronous condenser 4 based on the above three vibration signals does not belong to the content of this embodiment of the present invention, nor is it suitable for the protection content and scope of the present invention. Those skilled in the art can freely design its analysis process based on existing knowledge. Therefore, this embodiment is not specifically described here.

[0042] Furthermore, the displacement sensor 13 is arranged at the outer shell of the distributed synchronous condenser 4 to realize the acquisition of the vibration signal of the distributed synchronous condenser 4 itself.

[0043] Further, the axial vibration sensor 14 and the radial vibration sensor 15 are arranged at the rotor of the distributed synchronous condenser 4, and both the axial vibration sensor 14 and the radial vibration sensor 15 are electromagnetic vibration sensors.

[0044] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A wind-solar-thermal bundle power generation regulation system based on a distributed synchronous condenser, comprising a power generation end, the power generation end including a wind power generation system, a photovoltaic power generation system, and a thermal power generation system, characterized in that, Its regulation system further includes a number of distributed synchronous condensers and a central controller. The output ends of the wind power generation system, the photovoltaic power generation system, and the thermal power generation system are electrically connected to the DC power transmission system through an AC bus. The DC power transmission system is electrically connected to the receiving-end AC system. The distributed synchronous condensers are connected between the wind power generation system / photovoltaic power generation system and the AC bus. The central controller drives the distributed synchronous condensers to change the magnitude and direction of the reactive power output by the wind power generation system / photovoltaic power generation system.

2. The wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser according to claim 1, wherein A sensing component is connected between the DC power transmission system and the receiving-end AC system. The sensing component is signal-connected to the relay protection device. The central controller is respectively signal-connected to the distributed synchronous condensers and the relay protection device. The central controller drives the distributed synchronous condensers based on the output signal of the relay protection device to change the magnitude and direction of the reactive power output by the wind power generation system / photovoltaic power generation system.

3. The integrated power generation regulation system based on a distributed synchronous condenser for wind, light, and thermal power generation according to claim 1, wherein The output ends of the wind power generation system, the photovoltaic power generation system, and the thermal power generation system are electrically connected to the AC bus through step-up transformers.

4. A wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser according to claim 3, characterized in that, The distributed synchronous condensers are connected between the wind power generation system, the photovoltaic power generation system and the step-up transformers.

5. The wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser according to claim 2, wherein The sensing component includes a voltage transformer and a current transformer. The voltage transformer and the current transformer are both signal-connected to the relay protection device.

6. The wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser according to claim 1, wherein A displacement sensor, an axial vibration sensor and a radial vibration sensor are provided on the distributed synchronous condenser. The displacement sensor, the axial vibration sensor and the radial vibration sensor are all signal-connected to the central controller.

7. The wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser according to claim 6, characterized in that, The displacement sensor is arranged at the outer shell of the distributed synchronous condenser.

8. A wind-solar-thermal integrated power generation regulation system based on a distributed synchronous condenser according to claim 6, wherein, The axial vibration sensor and the radial vibration sensor are arranged at the rotor of the distributed synchronous condenser.

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