CN206490443U - A kind of multi-functional micro-grid connection measure and control device - Google Patents

Abstract

A kind of multi-functional micro-grid connection measure and control device, the signaling conversion circuit is connected by Hall voltage, current sensor, signaling conversion circuit and operating mechanism connection analog-to-digital conversion module, analog-to-digital conversion module connects single chip processing module, single chip processing module is also associated with the operating mechanism inside human-machine interface module and communication module and output control module, output control module connecting switch cabinet.The utility model device not only possesses the functions such as frequency measurement, voltage measurement, current measurement, power measurement, tri-phase unbalance factor measurement that conventional apparatus has, harmonic measurement function, flicker measurement function and accurate electric quantity metering function are also added on this basis, the need for more meeting micro-grid connection observing and controlling engineering reality, user no longer needs the instruments such as the grid-connected electric energy meter of extra purchase, power quality analyzer in use, and cost is low.Dynamic response is quick, and the signal sampling time is less than lus；Working band is wide, supports the high linearity output in 0 100kHz；Precision is high, better than 0.5%；Carrying load ability is strong, and voltage x current is excessive will not also to cause danger.

Description

A kind of multi-functional micro-grid connection measure and control device

Technical field

The utility model is related to a kind of multi-functional micro-grid connection measure and control device of field of new energy technologies.

Background technology

In recent years, many environmental problems are caused because the fossil energies such as oil and coal are excessively used, its reserves increasingly subtracts Energy crisis, the careful Nuclear Power Development in countries in the world, therefore distributed generation technology is caused less to receive more and more attention.It is micro- Power network is a kind of new technique means that distributed power source accesses power distribution network, meets distributed power source close friend access power distribution network and use Family is to the quality of power supply and the particular/special requirement of power supply reliability.Micro-capacitance sensor is by distributed power source, distributed energy storage and control device etc. An entirety is constituted, possesses complete generating, transmission of electricity, distributing function, controllable is can not only be used for and is connected to the grid middle operation, also may be used Depart from power network when power network produces failure, implement islet operation, improve the reliability that local load is powered.Micro-capacitance sensor is intelligent electricity The important component of net, an interactive intermediate layer is formd between power network, user and distributed power source, the two is improved The level of coordinated operation, significantly reduces the scattered access of a large amount of distributed power sources to power network and the adverse effect of user.Typical case Micro-grid system includes miniature gas turbine, photovoltaic cell, wind-driven generator, battery, diesel engine distributed power supply, storage Can unit and load.Each distributed power unit is connected by Technics of Power Electronic Conversion device, inverter with ac bus, whole micro- Network system accesses low-voltage network by breaker.Micro-grid system is a supermatic system, and it is needed simultaneously Measure and control device is installed at site, measurement, control, the function of communication is completed.

Traditional micro-grid connection measure and control device comes with some shortcomings：On the one hand, traditional micro-grid connection measure and control device Using electromagnetic type voltage transformer and electromagnetic type current transformer, original big voltage and high current signal are transformed into small electricity Pressure, low current signal, supply analogue collection module is as system input signal, but the response of electromagnetic type transformer is slow, passes Pass that frequency band is narrow, electromagnetic type mutual inductor coil inductance also has the effect of low pass filter, gatherer process high frequency signal Loss Rate compared with Height, influences voltage, the sampling precision of current signal and the sample rate of micro-capacitance sensor measure and control device；On the other hand, traditional micro- electricity The function of netting grid-connected measure and control device is less.Because traditional micro-capacitance sensor measure and control device uses electromagnetic type voltage, current transformer, electricity Magnetic-type transformer is primarily upon the transmission characteristic of fundamental wave during fabrication, and the high-frequency signal collected can be caused to produce certain amplitude Decay and phase shift, high frequency characteristics are excessively poor, and traditional grid-connected measure and control device can not collect accurate high-frequency signal, so traditional Device can not carry out voltage pulsation calculating, flickering analysis and accurate electric quantity metering by voltage, the current signal collected, and It is to need to increase extra device to realize voltage pulsation calculating, flickering analysis and accurate electric quantity metering, such cost can be very Height, so traditional grid-connected measure and control device does not have harmonic measurement function, flicker measurement function and grid-connected electric quantity metering in itself Function.

Utility model content

The purpose of this utility model is to provide a kind of multi-functional micro-grid connection measure and control device, in lifting Measure Precision and speed On the basis of degree, a variety of utility functions are had concurrently, provide solid reliable base support for micro-capacitance sensor safe and stable operation, be conducive to The intelligent and stability of power network is lifted, there is important application value in micro-capacitance sensor engineering.

To achieve the above object, the utility model provides a kind of multi-functional micro-grid connection measure and control device, it is characterised in that： Including switch cubicle, signaling conversion circuit, analog-to-digital conversion module, single chip processing module, communication module, human-machine interface module, defeated Go out control module, the inside switch cabinet has Hall voltage sensor, Hall current sensor, operating mechanism and high pressure open circuit Device, Hall voltage sensor, the signal output part of Hall current sensor connect the input of the signaling conversion circuit, described The signal output part of signaling conversion circuit and operating mechanism connects the input of the analog-to-digital conversion module, the analog-to-digital conversion mould The output end of block connects the input of single chip processing module, and the input of the single chip processing module is also associated with human-machine interface Mouth mold block and communication module, the output end of the single chip processing module connect the input of the output control module, described The output end of output control module connects the operating mechanism of the inside switch cabinet.

The beneficial effects of the utility model are：

1st, electromagnetic type voltage, current transformer are used on traditional measure and control device, electromagnetic type transformer is main during fabrication The transmission characteristic of fundamental wave is paid close attention to, the certain amplitude fading of the high-frequency signal generation collected and phase shift, high frequency characteristics are excessively poor, lead Cause traditional grid-connected measure and control device can not collect accurate high-frequency signal, it is impossible to possess voltage pulsation calculating, flickering analysis and Accurate electric quantity metering function.The utility model device is filled using advanced Hall voltage, the traditional observing and controlling of current sensor substitution Hall voltage, current sensor on electromagnetic type voltage, the current transformer put, new equipment can be collected in ac bus Accurate high frequency voltage, current signal, so as to realize voltage pulsation calculating, flickering analysis and accurate electric quantity metering.Hall electricity Pressure, the use of current sensor, make the utility model device not only possess frequency measurement, voltage that conventional apparatus has and survey The functions such as amount, current measurement, power measurement, tri-phase unbalance factor measurement, also add harmonic measurement function, sudden strain of a muscle on this basis Become measurement function and accurate electric quantity metering function, the need for more meeting micro-grid connection observing and controlling engineering reality, user is using In no longer need the instruments such as the grid-connected electric energy meter of extra purchase, power quality analyzer, cost is low.

2nd, traditional micro-grid connection measure and control device is gathered using electromagnetic type voltage transformer and electromagnetic type current transformer Voltage, current signal, electromagnetic type transformer response are slow, and transmission band is narrow, and the signal for also resulting in high frequency produces certain width Degree decay and phase shift, high frequency characteristics are poor, have a strong impact on the signal sampling precision and sample rate of micro-capacitance sensor measure and control device.This practicality New use Hall voltage sensor and Hall current sensor collection voltages, current signal, and the electromagnetism that conventional apparatus is used Type transformer is compared, and its advantage is mainly reflected in：Dynamic response is quick, and the signal sampling time is less than lus；Working band is wide, branch Hold the high linearity output in 0-100kHz；Precision is high, better than 0.5%；Carrying load ability is strong, and voltage x current is excessive also will not Cause danger.

Brief description of the drawings

Fig. 1 is a kind of multi-functional micro-grid connection measure and control device general structure functional block diagram.

Fig. 2 Hall voltage sensors and signaling conversion circuit connection figure；

Fig. 3 is Hall current sensor and signaling conversion circuit connection figure.

Embodiment

Reference picture 1, the utility model includes switch cubicle, signaling conversion circuit, analog-to-digital conversion module, single-chip microcomputer processing mould Block, communication module, human-machine interface module, output control module.The inside switch cabinet has Hall voltage sensor, Hall electricity Flow sensor, operating mechanism and primary cut-out, Hall voltage sensor, the signal output part connection institute of Hall current sensor The input of signaling conversion circuit is stated, the signal output part of the signaling conversion circuit and operating mechanism connects the analog-to-digital conversion The input of module, the output end of the analog-to-digital conversion module is connected at the input of single chip processing module, the single-chip microcomputer The input of reason module is also associated with human-machine interface module and communication module, the output end connection institute of the single chip processing module The input of output control module is stated, the output end of the output control module connects the operating mechanism of the inside switch cabinet.

Reference picture 2, U_A、U_B、U_CFor ac bus phase voltage, phase voltage U_A、U_B、U_CEntered respectively by a 200k Ω resistance Enter Hall voltage sensor, then become small electricity after the filter circuit of a 1k Ω resistance and a 22nF electric capacity composition again Signal Va, Vb, Vc are pressed, analog-to-digital conversion module is sent to.

Reference picture 3, I_A、I_B、I_CFor ac bus phase current, I_NFor neutral current, I_A、I_B、I_C、I_NRespectively enter Hall It is changed into low current signal I by signaling conversion circuit again after current sensor_a、I_b、I_c、I_nIt is sent to analog-to-digital conversion module.

Operation principle：Switch cubicle connects micro-capacitance sensor and power network by ac bus, and the Hall voltage, current sensor are adopted Collect primary voltage, the current signal on ac bus, then by signaling conversion circuit be converted into primary voltage, current signal small Voltage, the current signal of amplitude give analog-to-digital conversion module.It is small voltage that analog-to-digital conversion module sends signaling conversion circuit, small Current signal, and the divide-shut brake analog signal that operating mechanism is sent carry out analog-to-digital conversion, and the data signal changed is sent To single chip processing module, each phase voltage of ac bus that single chip processing module is sent according to analog-to-digital conversion module, electric current letter Number carry out voltage x current frequency calculating, power calculation, tri-phase unbalance factor calculatings, Harmonics Calculation, flickering calculating and grid-connected electricity Above-mentioned result of calculation and operating mechanism opening and closing state are exported to human-machine interface module by gauge amount etc., single chip processing module Row interaction display output；Single chip processing module is also exported result to Terminal Server Client by communication module；Single-chip microcomputer processing The operating mechanism that module sends inside instruction, output control module controlling switch cabinet according to result of calculation to output control module is produced Feed motion estranged, so as to control breaker to carry out divide-shut brake, realizes micro-capacitance sensor incision or cuts out power network.

Claims (1)

1. a kind of multi-functional micro-grid connection measure and control device, it is characterised in that：Turn including switch cubicle, signaling conversion circuit, modulus Block, single chip processing module, communication module, human-machine interface module, output control module are changed the mold, the inside switch cabinet has suddenly That voltage sensor, Hall current sensor, operating mechanism and primary cut-out, Hall voltage sensor, Hall current sensing The signal output part of device connects the input of the signaling conversion circuit, and the signal of the signaling conversion circuit and operating mechanism is defeated Go out the input of the end connection analog-to-digital conversion module, the output end connection single chip processing module of the analog-to-digital conversion module Input, the input of the single chip processing module is also associated with human-machine interface module and communication module, the single-chip microcomputer The output end for managing module connects the input of the output control module, is opened described in the output end connection of the output control module Close the operating mechanism inside cabinet.