阅读说明：本技术 一种具有多种无线通信方式的风电场电能质量监测装置 (Wind-powered electricity generation field power quality monitoring devices with multiple wireless communication mode ) 是由 焦强强 吴永华 李勇 许小强 郭峰 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种具有多种无线通信方式的风电场电能质量监测装置,所述风电场电能质量监测装置包括10个模块：ARM处理器主控模块、电源模块、采集模块、信号处理模块、数模转换模块、4G无线通信模块、数据存储模块、人机交互模块、GPS对时模块和声光报警模块。本发明解决了目前风电机组电能质量监测难以监测到的缺点,降低了电能质量数据上传的难度,后期加装改造监测装置不需要工程施工铺设通信光纤或网线,给风电场的电能质量监测提供了更加有效的监控手段。(The invention discloses a wind power plant power quality monitoring device with multiple wireless communication modes, which comprises 10 modules: the system comprises an ARM processor main control module, a power supply module, an acquisition module, a signal processing module, a digital-to-analog conversion module, a 4G wireless communication module, a data storage module, a man-machine interaction module, a GPS time synchronization module and an audible and visual alarm module. The invention solves the defect that the monitoring of the power quality of the wind turbine generator is difficult to monitor at present, reduces the difficulty of uploading power quality data, and provides a more effective monitoring means for the power quality monitoring of the wind power plant by additionally installing and modifying a monitoring device in the later period without laying communication optical fibers or network cables in engineering construction.)

1. A wind power plant electric energy quality monitoring device with multiple wireless communication modes is characterized by comprising 10 modules: the system comprises an ARM processor main control module, a power supply module, an acquisition module, a signal processing module, a digital-to-analog conversion module, a 4G wireless communication module, a data storage module, a man-machine interaction module, a GPS time synchronization module and an audible and visual alarm module;

the acquisition module acquires three-phase voltage and current analog signals from a wind driven generator box transformer substation, a photovoltaic inverter and a booster station bus;

the signal processing module amplifies and reduces the three-phase voltage and current analog signals acquired by the acquisition module;

the digital-to-analog conversion module converts three-phase voltage and current analog signals transmitted by the signal processing module into digital signals, transmits the converted digital signals to the ARM processor main control module for analysis and calculation, judges whether the quality of electric energy reaches the standard or not, and uploads data to a background by using the 4G wireless communication module through a public network if the quality of electric energy reaches the standard;

when the ARM processor main control module monitors the power quality event, the sound-light alarm module is started to send out sound-light alarm, so that inspection personnel can find out the inspection problem in time;

the power supply module supplies electric energy to other modules;

the data storage module stores power quality data and power quality events;

the man-machine interaction module comprises a key and a liquid crystal screen, wherein the key is used for inputting parameters and setting functions, and the liquid crystal screen is used for displaying data;

the wind power plant electric energy quality monitoring device uses a GPS time synchronization module to perform time synchronization with a GPS and a Beidou satellite;

the wind power plant electric energy quality monitoring device is additionally arranged on each wind driven generator box transformer substation and each photovoltaic inverter, and electric energy quality data are directly transmitted to an LoRa gateway through an LoRa module and are integrated to upper computer software of a computer in a wind driven generator or a distributed photovoltaic power plant with a short distance;

at far-distance wind driven generators or distributed photovoltaic power plants, an LoRa repeater is added to enlarge the data transmission distance, and then electric energy quality data are transmitted to an LoRa gateway through an LoRa module and are integrated to upper computer software of a computer, so that detailed electric energy quality data of operation of each wind driven generator box transformer substation and each photovoltaic inverter are monitored and managed in a unified mode.

Technical Field

The invention relates to monitoring devices in wind power stations and photovoltaic power stations, in particular to a power quality monitoring device in the monitoring devices.

Background

The wind power station is provided with a plurality of wind power sets, the electricity generated by the wind power sets is boosted to 10KV or 35KV through box-type transformers, then is converged to a booster station through buried cables or overhead lines, and the booster station boosts the voltage to 110KV or 220KV and then is connected to a power grid. A photovoltaic power plant is provided with a plurality of groups of photovoltaic panels, and direct current is firstly inverted into alternating current and then is merged into a power grid through boosting. Wind power and photovoltaic power can be smoothly merged into a national or regional power grid, and the method mainly depends on the capability of a power device to react to power supply fluctuation. Due to the randomness of wind and light, the voltage of the power grid is influenced to a certain extent due to the reactive power requirement during operation and the reactive power which can only be balanced in place; the problems of voltage fluctuation and flicker possibly caused by continuous operation of the wind turbine generator and the photovoltaic panel or in the switching operation process are solved; because of the high power electronics, higher harmonics are also generated and injected into the grid during operation.

If the wind power generation and the photovoltaic power generation are connected to the grid, the power quality must reach the standard, so the power quality condition of the wind power generation and the photovoltaic power generation needs to be monitored in real time. The electric energy quality monitoring device used by the existing wind power plant is mainly placed in a booster station, can test electric energy quality parameters such as frequency deviation, voltage deviation, current-voltage three-phase unbalance and the like, and transmits the monitored electric energy quality data to a computer upper computer of a control room through a network cable, so that an operator on duty can check the electric energy quality conditions of a wind power plant and a photovoltaic power plant. However, only the booster station is used for monitoring, so that only the total power quality condition of the booster station can be monitored, and the power quality of each wind turbine generator and each photovoltaic inverter is not monitored, so that if a power quality event occurs, which one or more wind turbine generators and photovoltaic inverters are caused by abnormal operation cannot be effectively searched out. Therefore, it is necessary to develop an effective wind power and photovoltaic power quality monitoring device with multiple wireless communication modes to monitor all wind turbine generators, inverters and booster stations of the whole wind power plant and photovoltaic power plant together.

Disclosure of Invention

The invention aims to provide a wind power plant electric energy quality monitoring device with multiple wireless communication modes, which overcomes the defect that the electric energy quality monitoring of the existing wind turbine generator is difficult to monitor, reduces the difficulty of uploading electric energy quality data, does not need to lay communication optical fibers or network cables in engineering construction by additionally installing and modifying the monitoring device in the later period, and provides a more effective monitoring means for the electric energy quality monitoring of the wind power plant.

The technical scheme provided by the invention is that the wind power plant electric energy quality monitoring device with multiple wireless communication modes is characterized by comprising 10 modules: the system comprises an ARM processor main control module, a power supply module, an acquisition module, a signal processing module, a digital-to-analog conversion module, a 4G wireless communication module, a data storage module, a man-machine interaction module, a GPS time synchronization module and an audible and visual alarm module;

the acquisition module acquires three-phase voltage and current analog signals from a wind driven generator box transformer substation, a photovoltaic inverter and a booster station bus;

the signal processing module amplifies and reduces the three-phase voltage and current analog signals acquired by the acquisition module;

the digital-to-analog conversion module converts three-phase voltage and current analog signals transmitted by the signal processing module into digital signals, transmits the converted digital signals to the ARM processor main control module for analysis and calculation, judges whether the quality of electric energy reaches the standard or not, and uploads data to a background by using the 4G wireless communication module through a public network if the quality of electric energy reaches the standard;

when the ARM processor main control module monitors the power quality event, the sound-light alarm module is started to send out sound-light alarm, so that inspection personnel can find out the inspection problem in time;

the power supply module supplies electric energy to other modules;

the data storage module stores power quality data and power quality events;

the man-machine interaction module comprises a key and a liquid crystal screen, wherein the key is used for inputting parameters and setting functions, and the liquid crystal screen is used for displaying data;

the wind power plant electric energy quality monitoring device uses the GPS time synchronization module to synchronize with the GPS and the Beidou satellite.

The wind power plant electric energy quality monitoring device is additionally arranged on each wind driven generator box transformer substation and each photovoltaic inverter, and electric energy quality data are directly transmitted to an LoRa gateway through an LoRa module and are integrated to upper computer software of a computer in a wind driven generator or a distributed photovoltaic power plant with a short distance; at far-distance wind driven generators or distributed photovoltaic power plants, an LoRa repeater is added to enlarge the data transmission distance, and then electric energy quality data are transmitted to an LoRa gateway through an LoRa module and are integrated to upper computer software of a computer, so that detailed electric energy quality data of operation of each wind driven generator box transformer substation and each photovoltaic inverter are monitored and managed in a unified mode.

The invention has the following advantages:

1. the power quality data of each wind turbine generator, each photovoltaic inverter and each booster station can be monitored, and the data management is simple and convenient;

2. the power quality data of each wind turbine generator and each photovoltaic inverter can be uploaded to the background in a wireless mode, and data can be transmitted without network cables or optical fibers;

3. the construction amount of the device during installation can be reduced, communication cables do not need to be laid, and the cost is reduced;

4. data can be uploaded through a 4G network and a public network; data can also be uploaded in a Lora wireless communication mode without uploading the data through a public network, so that the data safety is ensured.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

Fig. 2 is a general framework diagram of the present invention.

Detailed Description

As shown in fig. 1, the device for monitoring power quality of a wind farm with multiple wireless communication modes provided in this embodiment includes 10 modules: the system comprises an ARM processor main control module, a power supply module, an acquisition module, a signal processing module, a digital-to-analog conversion module, a 4G wireless communication module, a data storage module, a man-machine interaction module, a GPS time synchronization module and an audible and visual alarm module.

ARM handles the host system: the core control module of the whole equipment can interact with other modules;

a power supply module: providing power to other modules;

an acquisition module: the module is used for collecting voltage and current signals of a self-wind power generator box transformer substation, a photovoltaic inverter and a booster station bus;

the signal processing module: amplifying and reducing the voltage and current signals;

a digital-to-analog conversion module: analog signals transmitted by the signal processing module can be converted into digital signals, the converted digital signals are transmitted to the ARM processor main control module to be calculated to calculate frequency, voltage, current and other conventional data, voltage and current waveforms are analyzed and calculated through FFT to obtain harmonic wave and other data, and the harmonic wave and other data are compared with national or standard specified values to judge whether the power quality reaches the standard or not;

4G wireless communication module: the data communication is carried out by using the 4G wireless standard, and when the equipment can upload data to a background through a public network, the device can directly upload the data to the background through the 4G communication;

a data storage module: storing the collected electric energy quality data, electric energy quality events and the like;

a human-computer interaction module: the device mainly comprises keys and a liquid crystal display, wherein the keys are used for inputting parameters and setting functions; the liquid crystal screen is mainly used for displaying data and the like;

GPS time synchronization module: when the module is used for time synchronization with a GPS and a Beidou satellite, the time error is ensured to be very small;

the sound and light alarm module: when the power quality event is monitored, an audible and visual alarm can be given, so that inspection personnel can find the problem in time.

As shown in fig. 2, the wind farm power quality monitoring device with multiple wireless communication modes is additionally installed on the existing wind generator box transformer, photovoltaic inverter and booster station bus to monitor and control the power quality of the wind generators and photovoltaic inverters of the whole wind power plant and photovoltaic power plant.

Every aerogenerator case becomes all far away with photovoltaic inverter, carries out data transmission through loRa wireless communication module, and its advantage lies in can realizing far away distance communication and need not pass through public network, has guaranteed data security. If wind power generator or distributed photovoltaic power plant with longer distance is used, a LoRa repeater can be added to enlarge the data transmission distance, so that the material cost and the construction cost of arranging communication cables in large quantity can be reduced.

The monitoring device of each wind driven generator box transformer substation and the photovoltaic inverter can transmit the electric energy quality data to the LoRa gateway through the LoRa module and integrate the electric energy quality data to the upper computer software of a computer, and the detailed electric energy quality data of the operation of each wind driven generator and the photovoltaic inverter can be monitored and managed in a unified mode.