CN113381450B - Distributed power supply access point power quality evaluation system and evaluation control method thereof - Google Patents

Distributed power supply access point power quality evaluation system and evaluation control method thereof Download PDF

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CN113381450B
CN113381450B CN202110787227.5A CN202110787227A CN113381450B CN 113381450 B CN113381450 B CN 113381450B CN 202110787227 A CN202110787227 A CN 202110787227A CN 113381450 B CN113381450 B CN 113381450B
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power
wind
bus
distribution network
grid
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CN113381450A (en
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王蕾
戴攀
胡哲晟
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Economic and Technological Research Institute of State Grid Zhejiang Electric Power Co Ltd
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Economic and Technological Research Institute of State Grid Zhejiang Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48Controlling the sharing of the in-phase component
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/28The renewable source being wind energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Smart grids as climate change mitigation technology in the energy generation sector
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a distributed power supply access point power quality evaluation system and an evaluation control method thereof. Belonging to the technical field of distributed power supply access point power quality evaluation. The system comprises a power distribution network, a micro-grid and a power grid power quality monitoring platform, wherein a bus voltage detection sensor capable of detecting bus voltage and a first power detector capable of detecting the power on a bus are respectively arranged on the bus of the power distribution network; the micro-grid comprises a plurality of wind driven generators, wherein a second power detector capable of detecting the output power of each wind driven generator is respectively arranged at the power output end of each wind driven generator, each wind driven generator is also respectively provided with an intelligent induced draft device with adjustable blowing wind power, and the rear end of the intelligent induced draft device is fixed on a rack of the wind driven generator; and the control ends of the master voltage detection sensor, the first power detector, the second power detector and the intelligent induced draft device are respectively connected with the power quality monitoring platform of the power grid.

Description

分布式电源接入点电能质量评估系统及其评估控制方法Distributed power supply access point power quality evaluation system and its evaluation control method

技术领域technical field

本发明涉分布式电源接入点电能质量评估技术领域,具体涉及分布式电源接入点电能质量评估系统及其评估控制方法。The invention relates to the technical field of power quality evaluation of a distributed power source access point, in particular to a power quality evaluation system of a distributed power source access point and an evaluation control method thereof.

背景技术Background technique

目前,分布式布置的风力发电机已经通过微电网接入到配电网的母线上作为电力系统的供电电源来使用。At present, the distributed wind turbines have been connected to the busbar of the distribution network through the microgrid and used as the power supply of the power system.

由于微电网一般都是由风力发电机提供的电源,风力发电机发电存在间隙性和波动性,因此由风力发电机为配电网提供电源时,就要对分布式电源接入点的电能质量进行评估。Since microgrids are generally powered by wind turbines, wind turbines generate intermittent and fluctuating power. Therefore, when wind turbines provide power to the distribution network, it is necessary to monitor the power quality of the distributed power access point. to evaluate.

目前的评估控制方法不能对配电网母线上的有功功率进行平滑度控制和稳定性控制。The current evaluation control method cannot control the smoothness and stability of the active power on the distribution network bus.

发明内容SUMMARY OF THE INVENTION

本发明是为了解决现在对分布式电源接入点的电能质量评估可靠性差的不足,提供一种能对配电网母线上的有功功率进行平滑度控制和稳定性控制,可靠性高的对布式电源接入点电能质量评估系统及其评估控制方法。The invention is to solve the problem of poor reliability of the current power quality evaluation of the access point of the distributed power supply, and to provide a distribution network capable of smoothness control and stability control of the active power on the busbar of the distribution network, with high reliability. A power quality evaluation system and its evaluation control method for a power supply access point.

为了实现上述目的,本发明采用以下技术方案:In order to achieve the above object, the present invention adopts the following technical solutions:

分布式电源接入点电能质量评估系统,包括配电网、微电网和电网电能质量监控平台,在配电网的母线上分别设有能检测母线电压的母电压检测传感器和能检测母线上功率大小的一号功率检测器;Distributed power supply access point power quality assessment system, including distribution network, micro-grid and power grid power quality monitoring platform, on the bus of the distribution network are respectively equipped with a bus voltage detection sensor that can detect the bus voltage and a power detection sensor that can detect the power on the bus size one power detector;

微电网包括若干台风力发电机,在每台风力发电机的电源输出端分别设有能检测其输出功率的二号功率检测器,每台风力发电机还分别设有一个吹风风力大小可调节的智能引风装置,智能引风装置的后端固定在风力发电机的机架上,智能引风装置的出风口正对着对应的风力发电机的风机叶片布置;The microgrid includes several wind turbines. The power output end of each wind turbine is provided with a No. 2 power detector that can detect its output power. Intelligent air induction device, the rear end of the intelligent air induction device is fixed on the frame of the wind turbine, and the air outlet of the intelligent air induction device is arranged facing the corresponding fan blades of the wind turbine;

母电压检测传感器、一号功率检测器、二号功率检测器和智能引风装置的控制端分别与电网电能质量监控平台相连接。The bus voltage detection sensor, the No. 1 power detector, the No. 2 power detector and the control terminal of the intelligent induced draft device are respectively connected with the power grid power quality monitoring platform.

一种适用于分布式电源接入点电能质量评估系统的评估控制方法,分布式电源接入点电能质量评估控制方法的实现过程如下:An evaluation control method suitable for a power quality evaluation system of a distributed power source access point, the realization process of the power quality evaluation control method of a distributed power source access point is as follows:

在电网电能质量监控平台的控制下,由一号功率检测器实时对配电网母线上的电压进行监测,并同时由母电压检测传感器实时对配电网母线上所接负荷的有功功率进行监测;Under the control of the power grid power quality monitoring platform, the No. 1 power detector monitors the voltage on the distribution network bus in real time, and at the same time, the bus voltage detection sensor monitors the active power of the load connected to the distribution network bus in real time. ;

由于分布式布置的风力发电机在并网后,配电网的线路损耗降低,从微电网到配电网之间的电压降落减小,从而就抬高了配电网母线上的电压,配电网母线上的电压抬高的程度与分布式风力发电机输出电源的接入位置以及接入容量线性相关;After the distributed wind turbines are connected to the grid, the line loss of the distribution network is reduced, and the voltage drop from the microgrid to the distribution network is reduced, thereby raising the voltage on the distribution network bus, and the distribution network The degree of voltage rise on the grid bus is linearly related to the access position and access capacity of the distributed wind turbine output power;

当风力发电机输出的电源容量与母线上所接负荷所需的电量不相等时,让智能引风装置对吹风风力进行大小调节;When the output power capacity of the wind turbine is not equal to the power required by the load connected to the bus, let the intelligent air induction device adjust the size of the blowing wind;

先通过对风力发电机的吹风风力的控制来对风力发电机输出的电源容量的大小进行控制;First, the size of the power supply capacity output by the wind turbine is controlled by controlling the blowing force of the wind turbine;

然后风力发电机输出的电源容量的大小就能自然对配电网母线上的有功功率大小进行控制;Then the size of the power supply capacity output by the wind turbine can naturally control the size of the active power on the distribution network bus;

由于智能引风装置对吹风风力大小的调节是能够平滑进行的,因此通过智能引风装置也就能够对配电网母线上的有功功率进行平滑度控制和稳定性控制。Since the intelligent air induction device can smoothly adjust the blowing force, the intelligent air induction device can also control the smoothness and stability of the active power on the distribution network bus.

作为优选,所述智能引风装置包括主引风管,主引风管的后端出风口正对着风力发电机的风机叶片布置;在主引风管的前端进风口设有呈喇叭状的聚风罩,在聚风罩的喇叭口朝外布置,聚风罩的顶端口对接连接在主引风管的进风口上;在聚风罩上设有若干个开口与聚风罩的喇叭口边沿平行的罩壁孔,在每个罩壁孔上分别设有能关闭对应罩壁孔的孔门,每个孔门均由一台独立的气缸驱动控制其开闭;每台气缸的分别与电网电能质量监控平台相连接。Preferably, the intelligent air induction device includes a main air induction pipe, the rear air outlet of the main air induction pipe is arranged facing the fan blades of the wind turbine; the front air inlet of the main air induction pipe is provided with a trumpet-shaped The wind collecting hood is arranged with the bell mouth of the wind collecting hood facing outward, and the top port of the wind collecting hood is connected to the air inlet of the main air duct; The hood wall holes with parallel edges are provided on each hood wall hole with a hole door that can close the corresponding hood wall hole, and each hole door is driven by an independent air cylinder to control its opening and closing; The power grid power quality monitoring platform is connected.

作为优选,在主引风管内设有管内风力检测区,在管内风力检测区内分别间隔设有水平面风力检测装置和竖直面风力检测装置;Preferably, an in-pipe wind force detection area is provided in the main draft duct, and a horizontal plane wind force detection device and a vertical plane wind force detection device are respectively arranged in the in-pipe wind force detection area at intervals;

水平面风力检测装置包括一号细绳、一号拉力传感器和一号摄像头;The horizontal plane wind detection device includes No. 1 string, No. 1 tension sensor and No. 1 camera;

竖直面风力检测装置包括二号细绳、二号拉力传感器和二号摄像头;The vertical plane wind detection device includes the No. 2 string, the No. 2 tension sensor and the No. 2 camera;

一号拉力传感器固定在主引风管的左内管壁上,一号细绳的两端分别固定在主引风管的右内管壁上和一号拉力传感器的拉力检测端上,一号摄像头固定设在主引风管的上内管壁上;The No. 1 tension sensor is fixed on the left inner pipe wall of the main draft duct. The two ends of the No. 1 string are respectively fixed on the right inner pipe wall of the main draft duct and on the tension detection end of the No. 1 tension sensor. The camera is fixed on the upper inner pipe wall of the main air induction pipe;

二号拉力传感器固定在主引风管的上内管壁上,二号细绳的两端分别固定在主引风管的下内管壁上和二号拉力传感器的拉力检测端上,二号摄像头固定设在主引风管的左内管壁上;The No. 2 tension sensor is fixed on the upper inner pipe wall of the main draft pipe, and the two ends of the No. 2 string are respectively fixed on the lower inner pipe wall of the main draft pipe and the tension detection end of the No. 2 tension sensor. The camera is fixed on the left inner pipe wall of the main air induction pipe;

一号拉力传感器、二号拉力传感器、一号摄像头和二号摄像头分别与电网电能质量监控平台相连接;The No. 1 tension sensor, the No. 2 tension sensor, the No. 1 camera and the No. 2 camera are respectively connected to the power grid power quality monitoring platform;

在电网电能质量监控平台上设有与电网电能质量监控平台相连接的图像处理模块。An image processing module connected to the power grid power quality monitoring platform is arranged on the power grid power quality monitoring platform.

作为优选,在位于管内风力检测区处的主引风管的下内管壁上均布设有若干个下标记点;在位于管内风力检测区处的主引风管的右内管壁上均布设有若干个右标记点。Preferably, a number of lower marking points are evenly distributed on the lower inner pipe wall of the main draft pipe located at the wind detection area in the pipe; evenly distributed on the right inner pipe wall of the main draft pipe located at the wind detection area in the pipe There are several right marker points.

本发明能够达到如下效果:The present invention can achieve the following effects:

本发明能对配电网母线上的有功功率进行平滑度控制和稳定性控制,可靠性高,使用灵活方便,扩展性好。The invention can control the smoothness and stability of the active power on the bus bar of the distribution network, has high reliability, is flexible and convenient to use, and has good expansibility.

附图说明Description of drawings

图1是本发明的一种电路原理连接结构示意图。FIG. 1 is a schematic diagram of a circuit principle connection structure of the present invention.

图2是本发明智能引风装置安装在风力发电机上的一种连接结构示意图。FIG. 2 is a schematic diagram of a connection structure of the intelligent air induction device of the present invention installed on the wind generator.

图3是本发明聚风罩上罩壁孔处的一种连接结构示意图。FIG. 3 is a schematic diagram of a connection structure at the upper cover wall hole of the wind collecting cover according to the present invention.

图4是本发明电网电能质量监控平台与各控制部分相连接的一种电路原理连接结构示意图。FIG. 4 is a schematic diagram of a circuit principle connection structure of the present invention, in which the power grid power quality monitoring platform is connected with each control part.

图5是本发明细绳的弯曲度对称则说明此时主引风管内风均匀的一种状态示意图。FIG. 5 is a schematic diagram of a state in which the bending degree of the string of the present invention is symmetrical, indicating that the air in the main air duct is uniform at this time.

图6是本发明细绳的弯曲度不对称则说明此时主引风管内风不均匀的一种状态示意图。FIG. 6 is a schematic diagram of a state in which the curvature of the string of the present invention is asymmetrical, indicating that the air in the main air duct is not uniform at this time.

具体实施方式Detailed ways

下面结合附图与实施例对本发明作进一步的说明。The present invention will be further described below with reference to the accompanying drawings and embodiments.

实施例,分布式电源接入点电能质量评估系统,参见图1-4所示,包括配电网2、微电网3和电网电能质量监控平台27,在配电网的母线7上分别设有能检测母线电压的母电压检测传感器5和能检测母线上功率大小的一号功率检测器6;In an embodiment, the power quality assessment system for the access point of distributed power sources, as shown in Figures 1-4, includes a distribution network 2, a microgrid 3, and a power grid power quality monitoring platform 27, and the busbars 7 of the distribution network are respectively provided with A bus voltage detection sensor 5 that can detect the bus voltage and a No. 1 power detector 6 that can detect the power on the bus;

微电网包括若干台风力发电机4,在每台风力发电机的电源输出端分别设有能检测其输出功率的二号功率检测器26,每台风力发电机还分别设有一个吹风风力大小可调节的智能引风装置19,智能引风装置的后端固定在风力发电机的机架8上,智能引风装置的出风口正对着对应的风力发电机的风机叶片9布置;The microgrid includes several wind power generators 4, and the power output end of each wind power generator is respectively provided with a No. 2 power detector 26 capable of detecting its output power, and each wind power generator is also provided with a blower wind power size adjustable. The adjusted intelligent air induction device 19, the rear end of the intelligent air induction device is fixed on the frame 8 of the wind turbine, and the air outlet of the intelligent air induction device is arranged facing the corresponding fan blade 9 of the wind turbine;

母电压检测传感器、一号功率检测器、二号功率检测器和智能引风装置的控制端分别与电网电能质量监控平台相连接。The bus voltage detection sensor, the No. 1 power detector, the No. 2 power detector and the control terminal of the intelligent induced draft device are respectively connected with the power grid power quality monitoring platform.

所述智能引风装置包括主引风管22,主引风管的后端出风口30正对着风力发电机的风机叶片布置;在主引风管的前端进风口29设有呈喇叭状的聚风罩24,在聚风罩的喇叭口朝外布置,聚风罩的顶端口对接连接在主引风管的进风口上;在聚风罩上设有若干个开口与聚风罩的喇叭口边沿平行的罩壁孔18,在每个罩壁孔上分别设有能关闭对应罩壁孔的孔门16,每个孔门均由一台独立的气缸15驱动控制其开闭;每台气缸的分别与电网电能质量监控平台相连接。The intelligent air induction device includes a main air induction pipe 22, and the rear air outlet 30 of the main air induction pipe is arranged facing the fan blades of the wind turbine; The wind-gathering hood 24 is arranged at the bell mouth of the wind-gathering hood facing outward, and the top port of the wind-gathering hood is connected to the air inlet of the main air duct; The cover wall holes 18 are parallel to the mouth edge, and each cover wall hole is provided with a hole door 16 that can close the corresponding cover wall hole, and each hole door is driven by an independent air cylinder 15 to control its opening and closing; The cylinders are respectively connected with the power grid power quality monitoring platform.

在每个罩壁孔处的聚风罩外壁上设有滑槽25,滑槽的外口边沿设有防脱挡边17,孔门滑动设置在滑槽内,气缸的缸座固定设置在滑槽的下端,气缸的伸缩杆固定连接在孔门上。气缸推动孔门在滑槽内滑动来实现孔门对罩壁孔的开闭。A chute 25 is provided on the outer wall of the air collecting hood at each hood wall hole, the outer edge of the chute is provided with an anti-separation baffle 17, the hole door is slidably arranged in the chute, and the cylinder seat of the cylinder is fixedly arranged on the slide. At the lower end of the slot, the telescopic rod of the cylinder is fixedly connected to the hole door. The cylinder pushes the hole door to slide in the chute to realize the opening and closing of the hole door to the cover wall hole.

在主引风管内设有管内风力检测区21,在管内风力检测区内分别间隔设有水平面风力检测装置和竖直面风力检测装置;In the main draft duct, an in-pipe wind force detection area 21 is provided, and a horizontal plane wind force detection device and a vertical plane wind force detection device are respectively arranged in the in-pipe wind force detection area at intervals;

水平面风力检测装置包括一号细绳13、一号拉力传感器14和一号摄像头23;The horizontal plane wind detection device includes No. 1 string 13, No. 1 tension sensor 14 and No. 1 camera 23;

竖直面风力检测装置包括二号细绳10、二号拉力传感器28和二号摄像头12;The vertical plane wind detection device includes the No. 2 string 10, the No. 2 tension sensor 28 and the No. 2 camera 12;

一号拉力传感器固定在主引风管的左内管壁上,一号细绳的两端分别固定在主引风管的右内管壁上和一号拉力传感器的拉力检测端上,一号摄像头固定设在主引风管的上内管壁上;The No. 1 tension sensor is fixed on the left inner pipe wall of the main draft duct. The two ends of the No. 1 string are respectively fixed on the right inner pipe wall of the main draft duct and on the tension detection end of the No. 1 tension sensor. The camera is fixed on the upper inner pipe wall of the main air induction pipe;

二号拉力传感器固定在主引风管的上内管壁上,二号细绳的两端分别固定在主引风管的下内管壁上和二号拉力传感器的拉力检测端上,二号摄像头固定设在主引风管的左内管壁上;The No. 2 tension sensor is fixed on the upper inner pipe wall of the main draft pipe, and the two ends of the No. 2 string are respectively fixed on the lower inner pipe wall of the main draft pipe and the tension detection end of the No. 2 tension sensor. The camera is fixed on the left inner pipe wall of the main air induction pipe;

一号拉力传感器、二号拉力传感器、一号摄像头和二号摄像头分别与电网电能质量监控平台相连接。The No. 1 tension sensor, the No. 2 tension sensor, the No. 1 camera and the No. 2 camera are respectively connected with the power grid power quality monitoring platform.

在电网电能质量监控平台上设有与电网电能质量监控平台相连接的图像处理模块31。图像处理模块易于对摄像头拍摄到的图像进行处理。An image processing module 31 connected to the power grid power quality monitoring platform is provided on the power grid power quality monitoring platform. The image processing module is easy to process the image captured by the camera.

在一号拉力传感器、二号拉力传感器、一号摄像头和二号摄像头处的主引风管内壁上都分别设有凹槽11,一号拉力传感器、二号拉力传感器、一号摄像头和二号摄像头都分别设置在对应的凹槽内。凹槽减小风对一号拉力传感器、二号拉力传感器、一号摄像头和二号摄像头的破坏。There are grooves 11 on the inner wall of the main air duct at No. 1 tension sensor, No. 2 tension sensor, No. 1 camera and No. 2 camera, respectively. No. 1 tension sensor, No. 2 tension sensor, No. 1 camera and No. 2 The cameras are respectively arranged in the corresponding grooves. The grooves reduce wind damage to the No. 1 tension sensor, No. 2 tension sensor, No. 1 camera, and No. 2 camera.

在位于管内风力检测区处的主引风管的下内管壁上均布设有若干个下标记点20;在位于管内风力检测区处的主引风管的右内管壁上均布设有若干个右标记点。标记点在用户看摄像头怕是的图时,可根据细绳遮挡标记点位置即可判断出此时主引风管内风的大致均匀度。也方便图像处理模块对细绳图像的处理。A number of lower marking points 20 are evenly distributed on the lower inner pipe wall of the main air induction pipe located at the wind force detection area in the pipe; right marker point. When the marked point is viewed by the camera, the user can judge the approximate uniformity of the air in the main air duct at this time according to the position of the marked point blocked by the string. It is also convenient for the image processing module to process the string image.

一种适用于分布式电源接入点电能质量评估系统的评估控制方法,分布式电源接入点电能质量评估控制方法的实现过程如下:An evaluation control method suitable for a power quality evaluation system of a distributed power source access point, the realization process of the power quality evaluation control method of a distributed power source access point is as follows:

在电网电能质量监控平台的控制下,由一号功率检测器实时对配电网母线上的电压进行监测,并同时由母电压检测传感器实时对配电网母线上所接负荷的有功功率进行监测;Under the control of the power grid power quality monitoring platform, the No. 1 power detector monitors the voltage on the distribution network bus in real time, and at the same time, the bus voltage detection sensor monitors the active power of the load connected to the distribution network bus in real time. ;

由于分布式布置的风力发电机在并网后,配电网的线路损耗降低,从微电网到配电网之间的电压降落减小,从而就抬高了配电网母线上的电压,配电网母线上的电压抬高的程度与分布式风力发电机输出电源的接入位置以及接入容量线性相关;After the distributed wind turbines are connected to the grid, the line loss of the distribution network is reduced, and the voltage drop from the microgrid to the distribution network is reduced, thereby raising the voltage on the distribution network bus, and the distribution network The degree of voltage rise on the grid bus is linearly related to the access position and access capacity of the distributed wind turbine output power;

当风力发电机输出的电源容量与母线上所接负荷1所需的电量不相等时,让智能引风装置对吹风风力进行大小调节;When the power capacity output by the wind turbine is not equal to the power required by the load 1 connected to the bus, let the intelligent air induction device adjust the size of the blowing wind;

先通过对风力发电机的吹风风力的控制来对风力发电机输出的电源容量的大小进行控制;First, the size of the power supply capacity output by the wind turbine is controlled by controlling the blowing force of the wind turbine;

然后风力发电机输出的电源容量的大小就能自然对配电网母线上的有功功率大小进行控制;Then the size of the power supply capacity output by the wind turbine can naturally control the size of the active power on the distribution network bus;

由于智能引风装置对吹风风力大小的调节是能够平滑进行的,因此通过智能引风装置也就能够对配电网母线上的有功功率进行平滑度控制和稳定性控制。Since the intelligent air induction device can smoothly adjust the blowing force, the intelligent air induction device can also control the smoothness and stability of the active power on the distribution network bus.

通过气缸就能控制孔门的开闭,孔门开闭的大小和开启的孔门的个数就能够很好的对从聚风罩进入到主引风管内的风的大小。The opening and closing of the hole door can be controlled by the air cylinder, and the size of the hole door opening and closing and the number of the hole door opening can be well matched to the size of the wind entering the main air duct from the air collecting hood.

通过摄像头对对应的细绳进行拍摄,并对图像进行处理后即可知道此时分的大小。如果风力大,拉力传感器检测到的压力就大,如果风力小拉力传感器检测到的拉力就小。并且此时通过摄像头拍摄对应细绳的弯曲状态,即可知道此时在主引风管内风的均匀度,参见图6所示,如果细绳的弯曲度不对称则说明此时主引风管内风不均匀,参见图5所示,如果细绳的弯曲度对称则说明此时主引风管内风均匀,不均匀的风吹到风机叶片上会让叶片产生不平衡的抖动。叶片抖动会影响风机损坏,进而导致风机输出有功功率出现不易控制。The corresponding string is photographed by the camera, and the size of the moment can be known after the image is processed. If the wind force is large, the pressure detected by the tensile force sensor is large, and if the wind force is small, the tensile force detected by the tensile force sensor is small. And at this time, the bending state of the corresponding string is captured by the camera, and the uniformity of the wind in the main air duct at this time can be known. See Figure 6. If the bending of the string is asymmetrical, it means that the main air duct The wind is uneven, as shown in Figure 5. If the curvature of the string is symmetrical, it means that the wind in the main air duct is uniform at this time, and the uneven wind blowing on the fan blade will cause the blade to shake unbalanced. The blade vibration will affect the damage of the fan, which will lead to the difficulty in controlling the output active power of the fan.

由于分布式布置的风力发电机在并网后,配电网的线路损耗降低,从微电网到配电网之间的电压降落减小,从而就抬高了配电网母线上的电压,配电网母线上的电压抬高的程度与分布式风力发电机输出电源的接入位置以及接入容量线性相关;After the distributed wind turbines are connected to the grid, the line loss of the distribution network is reduced, and the voltage drop from the microgrid to the distribution network is reduced, thereby raising the voltage on the distribution network bus, and the distribution network The degree of voltage rise on the grid bus is linearly related to the access position and access capacity of the distributed wind turbine output power;

当风力发电机输出的电源容量大于母线上所需的负荷时,风力发电机电源会向配电网反向输送功率,这时由智能引风装置将吹风风力进行调小,让风力发电机输出的电源容量等于母线上所接负荷所需的电量;When the output power capacity of the wind turbine is greater than the load required on the bus, the wind turbine power supply will reversely transmit power to the distribution network. The power capacity of the bus is equal to the power required by the load connected to the bus;

当风力发电机输出的电源容量小于母线上所需的负荷时,分布式电源并网点母线和输电线路部分节点电压将会下降,,这时由智能引风装置将吹风风力进行调大,让风力发电机输出的电源容量等于母线上所接负荷所需的电量。When the output power capacity of the wind turbine is less than the load required on the bus, the voltage of the distributed power grid connection point bus and some nodes of the transmission line will drop. The power capacity output by the generator is equal to the power required by the load connected to the bus.

Claims (2)

1. The distributed power supply access point power quality evaluation system comprises a power distribution network, a micro-grid and a power grid power quality monitoring platform, and is characterized in that a bus of the power distribution network is respectively provided with a bus voltage detection sensor capable of detecting bus voltage and a first power detector capable of detecting the power on the bus;
the micro-grid comprises a plurality of wind driven generators, a second power detector capable of detecting the output power of each wind driven generator is arranged at the power output end of each wind driven generator, each wind driven generator is also provided with an intelligent air inducing device with adjustable air blowing wind power, the rear end of each intelligent air inducing device is fixed on a rack of the wind driven generator, and the air outlet of each intelligent air inducing device is arranged right opposite to the fan blade of the corresponding wind driven generator;
the control ends of the master voltage detection sensor, the first power detector, the second power detector and the intelligent induced draft device are respectively connected with the power quality monitoring platform of the power grid;
the intelligent air inducing device comprises a main air inducing pipe, and an air outlet at the rear end of the main air inducing pipe is arranged right opposite to a fan blade of the wind driven generator; a horn-shaped wind-gathering cover is arranged at an air inlet at the front end of the main induced draft pipe, a horn mouth of the wind-gathering cover is arranged outwards, and a top end opening of the wind-gathering cover is connected to the air inlet of the main induced draft pipe in a butt joint mode; the wind-gathering cover is provided with a plurality of cover wall holes with openings parallel to the edge of the bell mouth of the wind-gathering cover, each cover wall hole is respectively provided with a hole door capable of closing the corresponding cover wall hole, and each hole door is driven by an independent air cylinder to control the opening and the closing of the hole door; each air cylinder is respectively connected with a power grid power quality monitoring platform;
an in-tube wind power detection area is arranged in the main induced draft tube, and a horizontal plane wind power detection device and a vertical plane wind power detection device are respectively arranged in the in-tube wind power detection area at intervals;
the horizontal plane wind power detection device comprises a first string, a first tension sensor and a first camera;
the vertical surface wind power detection device comprises a second string, a second tension sensor and a second camera;
the first tension sensor is fixed on the left inner pipe wall of the main induced duct, two ends of the first thin rope are respectively fixed on the right inner pipe wall of the main induced duct and the tension detection end of the first tension sensor, and the first camera is fixedly arranged on the upper inner pipe wall of the main induced duct;
the second tension sensor is fixed on the upper inner pipe wall of the main induced duct, two ends of the second thin rope are respectively fixed on the lower inner pipe wall of the main induced duct and the tension detection end of the second tension sensor, and the second camera is fixedly arranged on the left inner pipe wall of the main induced duct;
the first tension sensor, the second tension sensor, the first camera and the second camera are respectively connected with the power grid power quality monitoring platform;
and the power grid power quality monitoring platform is provided with an image processing module connected with the power grid power quality monitoring platform.
2. An evaluation control method suitable for the distributed power supply access point power quality evaluation system of claim 1, wherein the distributed power supply access point power quality evaluation control method is implemented by the following steps:
under the control of a power quality monitoring platform of a power grid, a first power detector monitors the voltage on a power distribution network bus in real time, and a bus voltage detection sensor monitors the active power of a load connected to the power distribution network bus in real time;
after the wind driven generators arranged in a distributed mode are connected to the grid, the line loss of a power distribution network is reduced, and the voltage drop from a micro-grid to the power distribution network is reduced, so that the voltage on a bus of the power distribution network is raised, and the raising degree of the voltage on the bus of the power distribution network is linearly related to the access position and the access capacity of an output power supply of the distributed wind driven generator;
when the power capacity output by the wind driven generator is not equal to the electric quantity required by the load connected to the bus, the intelligent induced draft device adjusts the blowing wind power;
firstly, controlling the power supply capacity output by the wind driven generator by controlling the blowing wind power of the wind driven generator;
then the active power on the bus of the power distribution network can be naturally controlled by the power capacity output by the wind driven generator;
because the intelligent induced draft device can be smoothly adjusted to the wind power of blowing, smoothness control and stability control can be carried out on the active power on the power distribution network bus through the intelligent induced draft device.
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