CN109358227A - A resonant mutual inductance energy acquisition device for power grid monitoring - Google Patents

Abstract

Translated fromChinese

一种用于电网监测的谐振互感取能装置，包括电流互感器、互感取能模块、电流检测模块、能量管理模块、能量储存模块，所述互感取能模块包括谐振电容、整流电路、采样电阻、取能电容，所述电流检测模块包括电流传感放大器、有效值提取器、控制器，所述控制器为单片机控制器。本发明利用谐振电容与电流互感器组成LC谐振电路，具有自适应谐振功能，可以适用于各种不同规格的电流互感器。本发明在电流互感器一次侧绕组电流频率变化的情况下，可以自动调整谐振电容大小，大大提高了能量收集效率，且不再需要最大功率跟踪电路，环境适应性强。本发明不仅可以收集能量，同时还可以检测电网电流大小，适用于各种电网监测设备，解决了电网监测设备的能源问题，免去了更换电池的麻烦，减小了电池成本和运维成本。

A resonance mutual inductance energy acquisition device for power grid monitoring, comprising a current transformer, a mutual inductance energy acquisition module, a current detection module, an energy management module, and an energy storage module, wherein the mutual inductance energy acquisition module includes a resonance capacitor, a rectifier circuit, and a sampling resistor. and an energy-taking capacitor, the current detection module includes a current sensing amplifier, an effective value extractor, and a controller, and the controller is a single-chip controller. The invention utilizes the resonant capacitor and the current transformer to form an LC resonant circuit, has the function of self-adaptive resonance, and can be applied to various current transformers of different specifications. When the current frequency of the primary side winding of the current transformer changes, the invention can automatically adjust the size of the resonant capacitor, greatly improves the energy collection efficiency, no longer needs a maximum power tracking circuit, and has strong environmental adaptability. The invention can not only collect energy, but also detect the magnitude of grid current, is suitable for various grid monitoring equipment, solves the energy problem of grid monitoring equipment, saves the trouble of battery replacement, and reduces battery cost and operation and maintenance cost.

Description

A kind of resonance mutual inductance energy taking device for power network monitoring

Technical field

The present invention relates to electrical facility technical fields more particularly to a kind of resonance mutual inductance for power network monitoring to take and can fillIt sets.

Background technique

Smart grid carries out on-line real time monitoring to transmission of electricity road, and monitoring efficiency is high, time saving and energy saving, steady to power system securitySurely it is of great significance.In the prior art, the mode that the monitoring device in smart grid mostly uses mutual inductor to take energy provides power supply,But due to the resonant capacitance of different size mutual inductor difference, while resonance point is influenced also by environment, temperature can be shifted, so thatTake electrical efficiency to be difficult to be optimal, thus greatly reduce power network monitoring equipment using duration and the accuracy of monitoring data.Therefore, it is necessary to provide a kind of new above-mentioned technical problem is solved for the resonance mutual inductance energy taking device of power network monitoring.

Summary of the invention

Technical problem solved by the invention is to provide a kind of resonance mutual inductance energy taking device for power network monitoring.The dressSetting has the function of self-adapting resonance, can be according to the mutual inductor of different size and the primary current adjust automatically capacitor of different frequencyReach resonant state, takes energy efficiency to maximize, reduce starting current；The device can provide for various power network monitoring equipmentIndependent current source simultaneously monitors power network current size, have the advantages that it is small in size, facilitate installation, be non-maintaining, the service life it is long.

In order to solve the above technical problems, the present invention adopts the following technical scheme:

A kind of resonance mutual inductance energy taking device for power network monitoring, it is characterised in that: taking including current transformer, mutual inductance can mouldBlock, current detection module, energy management module, energy storage module, the first side winding and power network line of current transformer connectIt connects, secondary side winding and mutual inductance take energy module to connect；Mutual inductance takes energy module to connect with current detection module, energy management module,Energy management module is connect with energy storage module, and mutual inductance takes energy module that the electric energy of extraction is passed to energy management module, in turnEnergy storage module is stored in by energy management module；Energy storage module connects with current detection module and power network monitoring equipment simultaneouslyIt connects, energy storage module is energy management module, current detection module and the power supply of power network monitoring equipment, and the mutual inductance takes can moduleIncluding resonant capacitance, rectification circuit, sampling resistor, energy capacitor is taken, the current detection module includes current sense amplifier, hasThe secondary side winding connection composition LC resonance circuit of valid value extractor, controller, resonant capacitance and current transformer, mutual inductance take energyThe rectification circuit of module connect with secondary side winding and rectifies to the electric current from secondary side winding, sampling resistor and takes energyCapacitor is connected with the rectifying circuit, and the electric current exported after rectified circuit rectifies enters after sampling resistor takes energy capacitor, to takeIt can capacitor charging；It takes energy capacitor to connect with energy management module, takes energy capacitor by the power output being collected into energy management mouldBlock, energy management module is in turn by power storage in energy storage module；The current sense of the current detection module amplifiesDevice electric current input, output end be connected to mutual inductance take can module sampling resistor both ends, the current sense amplifier and effectivelyIt is worth extractor connection, virtual value extractor connection controller and power network monitoring equipment, controller are connect with resonant capacitance, the controlDevice processed is singlechip controller.

Further, the resonant capacitance is made of a capacitor array, the capacitor array by N number of capacitor of different sizes andElectronic switch composes in parallel, and electronic switch is connected by the controller of bus and current detection module, and controller is to electronic switchControl is carried out to obtain different size of total capacitance in parallel.

Further, the energy management module includes DC/DC converter and charge protection route, the energy stores mouldBlock includes super capacitor and lithium battery.

A kind of resonance mutual inductance energy taking device for power network monitoring of the present invention, utilizes resonant capacitance and current transformerLC resonance circuit is formed, has the function of self-adapting resonance, can be adapted for the current transformer of various different sizes.It is mutual in electric currentIt, can be with adjust automatically resonant capacitance size in the case that sensor first side winding power frequency changes.Compared to traditional resonance freeEnergy taking device substantially increases efficiency of energy collection, and no longer needs maximal power tracing circuit, takes compared to fixed resonant capacitanceEnergy device, improves the adaptability to different current transformers, first side winding electric current and environment.The present invention can not only collectEnergy, while power network current size can also be detected, compared to conventional current sensors, extra power power supply is not needed, is not required toWant additional energy taking device.The present invention is suitable for various power network monitoring equipment, solves the energy problem of power network monitoring equipment, removes fromThe trouble of replacement battery, reduces battery cost, human cost.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of the resonance mutual inductance energy taking device for power network monitoring of the present invention；

Fig. 2 is the electric schematic illustration of resonant capacitance of the present invention.

Embodiment

Below in conjunction with attached drawing, the technical solution in the present embodiment is clearly and completely described, embodiment is only the present inventionA part of the embodiment, instead of all the embodiments.Those of ordinary skill in the art are without making creative workEvery other embodiment obtained, shall fall within the protection scope of the present invention.

It please refers to shown in Fig. 1, the present invention provides a kind of resonance mutual inductance energy taking devices for power network monitoring, including electric currentMutual inductor, mutual inductance take energy module, current detection module, energy management module, energy storage module, the primary side of current transformerWinding is connect with power network line, secondary side winding and mutual inductance take energy module to connect；Mutual inductance takes can module and current detection module, energyManagement module connection is measured, energy management module is connect with energy storage module, and mutual inductance takes energy module that the electric energy of extraction is passed to energyManagement module is measured, and then energy storage module is stored in by energy management module；Energy storage module while and current detection moduleAnd the connection of power network monitoring equipment, energy storage module are that energy management module, current detection module and power network monitoring equipment are powered,The mutual inductance takes energy module to include resonant capacitance, rectification circuit, sampling resistor, take energy capacitor, and the current detection module includesThe secondary side winding connection composition LC of current sense amplifier, virtual value extractor, controller, resonant capacitance and current transformerResonance circuit, mutual inductance take the rectification circuit of energy module to connect and carry out to the electric current from secondary side winding whole with secondary side windingStream, sampling resistor and take can capacitor be connected with the rectifying circuit, the electric current exported after rectified circuit rectifies is after sampling resistorIt, can capacitor charging to take into energy capacitor is taken；Energy capacitor is taken to connect with energy management module, the electric energy for taking energy capacitor that will be collected intoOutput is to energy management module, energy management module and then by power storage in energy storage module；The current detecting mouldThe electric current input of the current sense amplifier of block, output end are connected to the sampling resistor both ends that mutual inductance takes energy module, the electric currentSensor amplifier is connect with virtual value extractor, and virtual value extractor connects controller and power network monitoring equipment, controller with it is humorousVibration capacitance connection, the controller are singlechip controller.The controller of current detection module can be according to the change of size of currentChange situation to control resonant capacitance by bus, adjust automatically resonant capacitance size.It is taken in energy module in mutual inductance, flows through and adoptThe electric current of sample resistance is the charging current for taking energy capacitor, is detected by current detection module to it, to reduce electric energyLoss, the resistance value of sampling resistor should be as small as possible.

As shown in Fig. 2, resonant capacitance is specifically to be made of a capacitor array, the capacitor array is by N number of electricity of different sizesHold and electronic switch composes in parallel, electronic switch is connected by the controller of bus and current detection module, and controller is to electronicsSwitch carries out control to obtain different size of total capacitance in parallel.Capacitor total quantity N numerical value is bigger, the variation of resonant capacitance valueRange is bigger.

After the alternating current that rectification circuit exports current transformer rectifies, electric current flows through sampling resistor, then is takenIt can capacitor charging.It takes energy capacitor by the power output being collected into subsequent energy management module, and then is stored in energy storesIn module.Energy storage module is energy management module, current detection module and power network monitoring equipment provide power supply.

The energy management module includes DC/DC converter and charge protection route, and the energy storage module includes superGrade capacitor and lithium battery.

Current detection module detection is the charging current for taking energy module, and it is primary largely also to can reflect power gridThe size of electric current, current detection module will test result and be output to power network monitoring equipment, can be used as the ginseng of power network current sizeNumerical value.

The foregoing is merely the schematical specific embodiment of the present invention, the range being not intended to limit the invention.It is anyThose skilled in the art, under the premise of not departing from design and the principle of the present invention made by equivalent changes and modifications, should allBelong to the scope of protection of the invention.

Claims (3)

Translated fromChinese

1.一种用于电网监测的谐振互感取能装置，其特征在于：包括电流互感器、互感取能模块、电流检测模块、能量管理模块、能量储存模块，电流互感器的一次侧绕组与电网线路连接、二次侧绕组与互感取能模块连接；互感取能模块与电流检测模块、能量管理模块连接，能量管理模块与能量储存模块连接，互感取能模块将提取的电能传入能量管理模块，进而由能量管理模块存入能量存储模块；能量存储模块同时与电流检测模块及电网监测设备连接，能量存储模块为能量管理模块、电流检测模块及电网监测设备供电，所述互感取能模块包括谐振电容、整流电路、采样电阻、取能电容，所述电流检测模块包括电流传感放大器、有效值提取器、控制器，谐振电容与电流互感器的二次侧绕组连接组成LC谐振电路，互感取能模块的整流电路与二次侧绕组连接并对来自二次侧绕组的电流进行整流，采样电阻和取能电容与整流电路连接，经整流电路整流后输出的电流经过采样电阻后进入取能电容，为取能电容充电；取能电容与能量管理模块连接，取能电容将收集到的电能输出至能量管理模块，能量管理模块进而将电能存储在能量存储模块中；所述电流检测模块的电流传感放大器的电流输入、输出端连接在互感取能模块的采样电阻两端，所述电流传感放大器与有效值提取器连接，有效值提取器连接控制器和电网监测设备，控制器与谐振电容连接，所述控制器为单片机控制器。1. a resonant mutual inductance energy acquisition device for power grid monitoring, is characterized in that: comprising current transformer, mutual inductance energy acquisition module, current detection module, energy management module, energy storage module, the primary side winding of the current transformer and the grid Line connection, secondary winding and mutual inductance energy acquisition module; , and then stored in the energy storage module by the energy management module; the energy storage module is connected with the current detection module and the power grid monitoring equipment at the same time, and the energy storage module supplies power to the energy management module, the current detection module and the power grid monitoring equipment, and the mutual inductance energy acquisition module includes: Resonant capacitor, rectifier circuit, sampling resistor, energy taking capacitor, the current detection module includes a current sensing amplifier, an effective value extractor, a controller, the resonant capacitor is connected with the secondary winding of the current transformer to form an LC resonant circuit, and the mutual inductance The rectifier circuit of the energy taking module is connected to the secondary side winding and rectifies the current from the secondary side winding. The sampling resistor and the energy taking capacitor are connected to the rectifier circuit, and the output current rectified by the rectifier circuit passes through the sampling resistor and enters the energy taker The capacitor is used to charge the energy acquisition capacitor; the energy acquisition capacitor is connected to the energy management module, and the energy acquisition capacitor outputs the collected electric energy to the energy management module, and the energy management module further stores the electric energy in the energy storage module; the current detection module has The current input and output ends of the current sensing amplifier are connected to both ends of the sampling resistor of the mutual inductance energy acquisition module, the current sensing amplifier is connected to the RMS extractor, the RMS extractor is connected to the controller and the power grid monitoring equipment, and the controller is connected to the RMS extractor. The resonant capacitor is connected, and the controller is a single chip controller.2.根据权利要求1所述的一种用于电网监测的谐振互感取能装置，其特征在于：所述谐振电容由一电容阵列组成，该电容阵列由N个大小不同的电容及电子开关并联组成，电子开关通过总线与电流检测模块的控制器连接，控制器对电子开关进行控制从而获得不同大小的并联总电容。2. A resonant mutual inductance energy-getting device for power grid monitoring according to claim 1, characterized in that: the resonant capacitor is composed of a capacitor array, and the capacitor array is composed of N capacitors of different sizes and an electronic switch in parallel The electronic switch is connected with the controller of the current detection module through the bus, and the controller controls the electronic switch to obtain the parallel total capacitance of different sizes.3.根据权利要求1所述的一种用于电网监测的谐振互感取能装置，其特征在于：所述能量管理模块包括DC/DC转化器和充电保护线路，所述能量存储模块包括超级电容和锂电池。3. A resonant mutual inductance energy acquisition device for power grid monitoring according to claim 1, characterized in that: the energy management module comprises a DC/DC converter and a charging protection circuit, and the energy storage module comprises a super capacitor and lithium batteries.