Active power control system and method for wind and light station

Abstract

The invention provides an active control system and method for a wind and light station, and the system comprises a photovoltaic power station, a wind power station, a first protocol converter, a second protocol converter, a first integrated automatic monitoring terminal, and a second integrated automatic monitoring terminal. The wind power plant is connected with the second integrated automation monitoring terminal through the second protocol converter, the photovoltaic power station and the wind power plant are connected with the AGC / AVC background through the first protocol converter and the second protocol converter respectively, the working principle is simple, complementarity among various resources can be utilized to the maximum extent, efficient consumption of high-proportion renewable energy sources is guaranteed, and the utilization rate of the renewable energy sources is improved. Through a distributed algorithm, various types of energy sources are divided into small processing parts to be processed uniformly, so that the processing efficiency is improved, and the coordination control delay of the comprehensive energy sources is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind and solar power stations, and in particular to an active power control system and method for wind and solar power stations. Background Art

[0002] In recent years, the installed capacity of new energy has grown rapidly. By the end of February 2024, the total installed capacity of power generation in China was about 2.97 billion kilowatts, a year-on-year increase of 14.7%. Among them, the installed capacity of solar power generation was about 650 million kilowatts, a year-on-year increase of 56.9%; the installed capacity of wind power was about 450 million kilowatts, a year-on-year increase of 21.3%. From a geographical point of view, China's large-scale wind and light resources are mostly distributed in Northwest China, North China and Northeast China, namely the "Three Norths" region. However, due to the strong volatility of wind and light resources, insufficient transmission capacity of the power grid and stability, it is difficult to alleviate the phenomenon of wind and light abandonment in the Three Norths. In 2023, the national wind abandonment rate was 2.7% and the light abandonment rate was 2.0%, of which the Ningxia Hui Autonomous Region had a wind abandonment rate of 2.2% and a light abandonment rate of 3.6%.

[0003] The power of wind power and photovoltaic power is difficult to accurately predict due to its inherent uncertainty of random fluctuations. Random fluctuations in power may cause a serious imbalance between power generation and load, thereby causing large frequency deviations or voltage stability problems, and increasing system operation risks. In power systems with low inertia and limited frequency response capabilities, the uncertainty of wind power and photovoltaic power has a particularly significant negative impact on the system. When the power of grid-connected renewable energy fluctuates, the system needs to provide more flexible power sources to balance the fluctuations in wind power output, but the increase in the penetration rate of renewable energy will correspondingly reduce the proportion of flexible power sources, resulting in insufficient grid flexibility, which creates a contradiction between the output characteristics of renewable energy and the power system's requirements for power output. With the increase in the proportion of renewable energy installed capacity, this contradiction has become increasingly severe and has gradually become a bottleneck restricting the further development of the new energy industry. The wind-solar complementary power generation system is one of the important implementation paths to cope with the volatility and intermittency of renewable energy. By studying the complementary characteristics of wind and solar power output, understanding the matching degree of wind and solar power output in time and space, and based on data-driven modeling technology and high-precision wind and solar power prediction technology, establishing a wind-solar complementary integrated operation platform, and realizing economical and friendly scheduling of wind-solar complementary power generation systems, thereby smoothing out new energy fluctuations, improving power quality, and increasing green electricity consumption.

[0004] The traditional multi-period optimization operation method does not fully understand the complementary mechanism of multiple energy sources and the key constraints of system absorption, and cannot maximize the complementarity between various resources, making it difficult to ensure the efficient absorption of a high proportion of renewable energy. Therefore, it is urgent to consider the uncertainty of renewable energy and the optimal scheduling method of the spatiotemporal flexible complementary performance between multiple types of power sources, and design an active power control system for wind and solar power stations. Summary of the invention

[0005] The present application provides an active power control system and method for a wind and solar power station to solve the problem of low control efficiency in the prior art, achieve the purpose of maximizing the complementarity between various resources, ensuring the efficient absorption of a high proportion of renewable energy, and reducing the delay of comprehensive energy coordinated control.

[0006] The present application provides an active control system for a wind and solar power station, the active control system comprising a photovoltaic power station, a wind farm, a first protocol converter, a second protocol converter, a first integrated self-monitoring terminal and a second integrated self-monitoring terminal;

[0007] The photovoltaic power station is connected to the first integrated self-monitoring terminal via a first protocol converter;

[0008] The wind farm is connected to the second integrated self-monitoring terminal via a second protocol converter;

[0009] The photovoltaic power station and the wind farm are connected to the AGC / AVC backend through the first protocol converter and the second protocol converter respectively.

[0010] Preferably, the present application provides an active control system for a wind and solar power station, which also includes an AGC / AVC host machine and an AGC / AVC host standby machine. The photovoltaic power station and wind farm are connected to the AGC / AVC host machine and the AGC / AVC host standby machine through a first protocol converter and a second protocol converter, respectively.

[0011] Preferably, the present application provides an active control system for a wind and solar power station, wherein the photovoltaic power station is connected to a data communication gateway machine plane one through a first protocol converter, and the data communication gateway machine plane one is connected to a scheduling data network plane one; the wind farm is connected to a data communication gateway machine plane two through a second protocol converter, and the data communication gateway machine plane two is connected to a scheduling data network plane two.

[0012] Preferably, the present application provides an active power control system for a wind-solar station, wherein a plurality of photovoltaic inverters are arranged in the photovoltaic power station; and a plurality of wind turbines are arranged in the wind farm.

[0013] Preferably, the present application provides an active power control system for a wind and solar power station, wherein the control object of the photovoltaic power station is a centralized inverter or a data collector, and the method of distributing active power among the inverters or data collectors is: a similar margin distribution method, an equal proportion distribution method or a manually set proportion distribution method.

[0014] Preferably, the present application provides an active power control system for a wind and solar power station, wherein the wind farm control object is a wind turbine energy management platform, and the method of distributing active power among wind turbine groups is: similar margin distribution method, equal proportion distribution method or manually set proportion distribution method.

[0015] Preferably, the present application provides an active power control system for a wind and solar power station, wherein the first protocol converter and the second protocol converter both include an MCU and an Ethernet communication unit, the Ethernet communication unit is electrically connected to the MCU, and further includes: at least one RS232 communication module, at least one CAN communication module and at least one RS485 communication module, the at least one RS232 communication module, at least one RS485 communication module and at least one CAN communication module are electrically connected to the MCU, respectively.

[0016] Preferably, a method for using an active power control system for a wind and solar power station comprises the following steps:

[0017] A. The operating parameters of the photovoltaic inverter in the photovoltaic power station and the wind turbine in the wind farm are transmitted to the integrated self-monitoring terminal through the protocol converter;

[0018] B. The integrated self-monitoring terminal transmits the collected power data to the AGC / AVC background;

[0019] C. The AGC / AVC host distributes active power to the photovoltaic inverter and wind turbine;

[0020] D. The allocated power parameters are transmitted to the dispatching data network plane;

[0021] E. The dispatching data network plane feeds back the power allocation data to the AGC / AVC background to adjust the operating power of the photovoltaic inverter and wind turbine.

[0022] Beneficial effects:

[0023] (1) The working principle of the present invention is simple, and it can maximize the complementarity between various types of resources, ensure the efficient absorption of a high proportion of renewable energy, and divide various types of multiple energy into smaller processing parts through distributed algorithms, so as to uniformly process them, improve processing efficiency, and reduce the delay of comprehensive energy coordination control. In addition, through construction, reduction technology and efficient solution methods, the random optimization scheduling model can be quickly and accurately solved to meet the needs of scheduling timeliness and safety.

[0024] (2) The protocol converter used in the present invention can realize protocol conversion of devices with different communication protocols through one protocol converter, thereby further reducing control delay.

[0025] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a control principle block diagram of the present invention;

[0028] Figure 2 This is a principle block diagram of the protocol converter of the present invention;

[0029] Figure 3 It is the work flow chart of the present invention.

[0030] Explanation of the accompanying drawings: photovoltaic power station 1, wind farm 2, first protocol converter 3, second protocol converter 4, first integrated self-monitoring terminal 5, second integrated self-monitoring terminal 6, AGC / AVC background 7, AGC / AVC upper host 8, AGC / AVC upper standby machine 9, data communication gateway machine plane 10, dispatching data network plane 11, data communication gateway machine plane 2 12, dispatching data network plane 2 13, photovoltaic inverter 14, wind turbine 15, MCU 16, Ethernet communication unit 17, RS232 communication module 18, CAN communication module 19, RS485 communication module 20. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. For example, in the description of the present application, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0035] In addition, the expressions of indicated directions such as the X direction, the Y direction, and the Z direction used to illustrate the operation and construction of the components of the present embodiment are not absolute but relative, and although these indications are appropriate when the components are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.

[0036] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0037] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0039] See also Figure 1-Figure 3 The present application discloses an active power control system for a wind and solar power station, the active power control system comprising a photovoltaic power station 1, a wind farm 2, a first protocol converter 3, a second protocol converter 4, a first integrated self-monitoring terminal 5 and a second integrated self-monitoring terminal 6; a plurality of photovoltaic inverters 14 are arranged in the photovoltaic power station 1; a plurality of wind turbines 15 are arranged in the wind farm 2.

[0040] The photovoltaic power station 1 is connected to the first integrated self-monitoring terminal 5 via the first protocol converter 3;

[0041] The wind farm 2 is connected to the second integrated self-monitoring terminal 6 via the second protocol converter 4;

[0042] The photovoltaic power station 1 and the wind farm 2 are connected to the AGC / AVC backend 7 through the first protocol converter 3 and the second protocol converter 4 respectively.

[0043] The present invention also includes an AGC / AVC host machine 8 and an AGC / AVC standby machine 9. The photovoltaic power station 1 and the wind farm 2 are connected to the AGC / AVC host machine 8 and the AGC / AVC standby machine 9 via a first protocol converter 3 and a second protocol converter 4, respectively.

[0044] In the present invention, the photovoltaic power station 1 is connected to the data communication gateway machine plane 10 through the first protocol converter 3, and the data communication gateway machine plane 10 is connected to the scheduling data network plane 11; the wind farm 2 is connected to the data communication gateway machine plane 12 through the second protocol converter 4, and the data communication gateway machine plane 12 is connected to the scheduling data network plane 2 13.

[0045] In the present invention, the first protocol converter 3 and the second protocol converter 4 both include an MCU 16 and an Ethernet communication unit 17, the Ethernet communication unit 17 is electrically connected to the MCU 16, and further include: at least one RS232 communication module 18, at least one CAN communication module 19 and at least one RS485 communication module 20, the at least one RS232 communication module 18, at least one RS485 communication module 19 and at least one CAN communication module 20 are electrically connected to the MCU respectively. The protocol converter used in the present invention can realize protocol conversion of devices with different communication protocols through one protocol converter, further playing a role in reducing control delay.

[0046] In the present invention, a method for using an active power control system for a wind and solar power station is provided, and the method comprises the following steps:

[0047] A. The operating parameters of the photovoltaic inverter in the photovoltaic power station and the wind turbine in the wind farm are transmitted to the integrated self-monitoring terminal through the protocol converter;

[0048] B. The integrated self-monitoring terminal transmits the collected power data to the AGC / AVC background;

[0049] C. The AGC / AVC host distributes active power to the photovoltaic inverter and wind turbine;

[0050] D. The allocated power parameters are transmitted to the dispatching data network plane;

[0051] E. The dispatching data network plane feeds back the power allocation data to the AGC / AVC background to adjust the operating power of the photovoltaic inverter and wind turbine.

[0052] The distribution method of wind and solar active power is as follows:

[0053] (1) Non-limited power active power distribution method:

[0054] Similar margin allocation method - allocation is made according to the active margin size of each participating active power control generator set;

[0055] Equal active capacity allocation method - allocation based on the active capacity of each participating active control wind and solar

[0056] Proportional active power distribution - evenly distribute the total active power of the whole field to each participating active power control generator set

[0057] (2) Limited power active power distribution method

[0058] Electricity price priority allocation method - prioritize power restriction for photovoltaic power generation units, first allocate according to the active power margin of each wind turbine participating in active power control, and then allocate to the inverter participating in active power control.

[0059] After the active power distribution of wind and solar power is completed, the active power distribution principle of each wind turbine and photovoltaic inverter is consistent with the distribution principle of single wind farm and single photovoltaic power station. The distribution of single wind and single solar power is as follows:

[0060] The control object of the photovoltaic power station is a centralized inverter or a data collector, and the methods of distributing active power between the inverters or the data collectors are: similar margin distribution method, equal proportion distribution method or manually set proportion distribution method.

[0061] The control object of the wind farm is the wind turbine energy management platform, and the methods of active power distribution among wind turbine groups are: similar margin distribution method, equal proportion distribution method or manually set proportion distribution method.

[0062] In summary, the working principle of the present invention is simple, and it can maximize the use of complementarity between various types of resources, ensure the efficient consumption of a high proportion of renewable energy, and divide various types of multiple energy into smaller processing parts through distributed algorithms, so as to process them in a unified manner, thereby improving processing efficiency and reducing the delay of comprehensive energy coordination control. In addition, through construction, reduction technology and efficient solution methods, the random optimization scheduling model can be quickly and accurately solved to meet the needs of scheduling timeliness and safety.

[0063] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An active power control system for a wind and solar power station, characterized in that: The active power control system comprises a photovoltaic power station (1), a wind farm (2), a first protocol converter (3), a second protocol converter (4), a first integrated self-monitoring terminal (5) and a second integrated self-monitoring terminal (6); The photovoltaic power station (1) is connected to a first integrated self-monitoring terminal (5) via a first protocol converter (3); The wind farm (2) is connected to the second integrated self-monitoring terminal (6) via a second protocol converter (4); The photovoltaic power station (1) and the wind farm (2) are connected to the AGC / AVC backend (7) respectively through a first protocol converter (3) and a second protocol converter (4).

2. The active power control system for a wind and solar power station according to claim 1, characterized in that: It also includes an AGC / AVC upper host (8) and an AGC / AVC upper standby machine (9). The photovoltaic power station (1) and the wind farm (2) are connected to the AGC / AVC upper host (8) and the AGC / AVC upper standby machine (9) respectively through a first protocol converter (3) and a second protocol converter (4).

3. The active power control system for a wind and solar power station according to claim 1, characterized in that: The photovoltaic power station (1) is connected to a data communication gateway machine plane (10) via a first protocol converter (3), and the data communication gateway machine plane (10) is connected to a scheduling data network plane (11); the wind farm (2) is connected to a data communication gateway machine plane (12) via a second protocol converter (4), and the data communication gateway machine plane (12) is connected to a scheduling data network plane (13).

4. The active power control system for a wind and solar power station according to claim 1 is characterized in that: A plurality of photovoltaic inverters (14) are arranged in the photovoltaic power station (1); and a plurality of wind turbines (15) are arranged in the wind farm (2).

5. The active power control system for a wind and solar power station according to claim 1 is characterized in that: The photovoltaic power station control object is a centralized inverter or a data collector, and the active power distribution method between the inverters or the data collectors is: a similar margin distribution method, an equal proportion distribution method or an manually set proportion distribution method.

6. The active power control system for a wind and solar power station according to claim 1, characterized in that: The wind farm control object is a wind turbine energy management platform, and the active power distribution method among wind turbine groups is: similarity margin distribution method, equal proportion distribution method or manually set proportion distribution method.

7. The active power control system for a wind and solar power station according to claim 1, characterized in that: The first protocol converter (3) and the second protocol converter (4) both comprise an MCU (16) and an Ethernet communication unit (17), wherein the Ethernet communication unit (17) is electrically connected to the MCU (16), and further comprise: at least one RS232 communication module (18), at least one CAN communication module (19) and at least one RS485 communication module (20), wherein the at least one RS232 communication module (18), at least one RS485 communication module (19) and at least one CAN communication module (20) are electrically connected to the MCU respectively.

8. A method for using the active power control system for a wind and solar power station as claimed in claim 1, characterized in that: The method of use includes the following steps: A. The operating parameters of the photovoltaic inverter in the photovoltaic power station and the wind turbine in the wind farm are transmitted to the integrated self-monitoring terminal through the protocol converter; B. The integrated self-monitoring terminal transmits the collected power data to the AGC / AVC background; C. The AGC / AVC host distributes active power to the photovoltaic inverter and wind turbine; D. The allocated power parameters are transmitted to the dispatching data network plane; E. The dispatching data network plane feeds back the power allocation data to the AGC / AVC background to adjust the operating power of the photovoltaic inverter and wind turbine.

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