CN206892220U - A kind of equipment for monitoring power quality - Google Patents

Abstract

It the utility model is related to a kind of equipment for monitoring power quality, including the primary module for connecting core bus, the primary module includes being used for the first processor for connecting core bus, obtaining circuit electric parameter to be monitored from core bus, and for handling the second processor of the electric parameter, the first processor and second processor communication connection, the second processor are provided with data disaply moudle and for the external communication interfaces with PERCOM peripheral communication.The utility model in primary module by setting two processors, it is possible to achieve data acquisition and data processing are carried out simultaneously, effectively prevent the loss of data, ensure that the detection accuracy of circuit electric parameter to be monitored.

Description

A kind of equipment for monitoring power quality

Technical field

A kind of equipment for monitoring power quality is the utility model is related to, belongs to electric power quality monitoring technical field.

Background technology

The height of the whole world particularly developed country is caused with the development of modern science and technology, the problem of the quality of power supply Degree is paid attention to.On the one hand, because electric power, electronic technology develop rapidly, particularly electric furnace steel making, multinomial silicon controlled rectifier and wash The extensive use of the home appliances such as clothing machine, air-conditioning so that voltage, current waveform in power network are distorted, and cause the quality of power supply The severe exacerbation of problem；On the other hand, because the horizontal raising of industrial automation, the intelligent device such as microprocessor and PLC are a large amount of Applied to industrial stokehold, and these fine Engineering Controls are easier to be influenceed by Power System Disturbances.At the same time, it is electric Power market gradually forms, and economy and social loss's problem become increasingly conspicuous caused by being influenceed by the quality of power supply, in many countries Cause power department and the extensive concern of user.

In order to improve the power supply quality of power system, it is ensured that system it is safe and reliable operation, it is necessary to the harmonic wave in system, The pollution such as voltage fluctuation and flicker and tri-phase unbalance factor is monitored, it is necessary to establishes Analysis System for Power Quality.It is because electric Force system pollution interference has certain randomness, and it is relevant with part throttle characteristics and system working condition, often triggers accident The time that interference occurs is shorter, and occurrence condition is special, so needing the items using real time on-line monitoring system to power system Power quality index carries out long-term monitoring.

And existing electric energy quality monitoring system generally use data acquisition and the mode of data processing timesharing alternately, This will cause the loss of partial data, causes monitoring result inaccurate, under serious conditions, is likely to result in great electric power safety Accident.

Utility model content

The purpose of this utility model is to provide a kind of equipment for monitoring power quality, for solving collection and data processing timesharing The loss of partial data is alternately caused, the problem of causing monitoring result inaccuracy.

In order to solve the above technical problems, the utility model provides a kind of equipment for monitoring power quality, including for connecting The primary module of core bus, the primary module include electric for connecting core bus, obtaining circuit to be monitored from core bus The first processor of parameter, and for handling the second processor of the electric parameter, at the first processor and second Device communication connection is managed, the second processor is provided with data disaply moudle and for the external communication interface with PERCOM peripheral communication.

Further, the first processor is DSP Processor, and the second processor is arm processor.

Further, the first processor and second processor are respectively connected with external memory storage.

Further, the data disaply moudle is LCD display.

Further, the external communication interface includes RS485 communication interfaces and ethernet interface.

Further, the monitoring device also includes being used to connect core bus and sends line electricity to be monitored to core bus At least one slave module of gas parameter, what the slave module included being sequentially connected is used to realize the sampling pretreatment mould of level conversion Block, the AD sampling modules for realizing AD conversion and filtering and the Logic control module for realizing sampling time sequence control；Institute State Logic control module and communicate to connect the first processor, the sampling pretreatment module, which is used to sample, connects circuit to be monitored Current transformer and voltage transformer.

Further, the Logic control module is provided with external memory storage.

The beneficial effects of the utility model are：

By setting two processors of communication connection in primary module, wherein first processor is used to adopt from core bus Collect the electric parameter of circuit to be monitored, second processor is electrically joined for handling the circuit to be monitored that first processor is collected Number, and the data after processing are shown by display module, remotely sent by external communication interface, it is final to realize The electric energy quality real-time monitoring of circuit to be monitored；The monitoring device can realize data acquisition and data processing while carry out, and have Effect avoids the loss of data, ensure that the detection accuracy of circuit electric parameter to be monitored.

Further, the monitoring device also includes being used to connect core bus and sends line electricity to be monitored to core bus The slave module of gas parameter, when needing to expand circuit to be monitored, it is only necessary to which corresponding slave module is set, by the slave module It is connected with core bus, without changing the connection of primary module and original submodule, it is simple and convenient expands process.

Brief description of the drawings

Fig. 1 is the overall structure diagram of power quality analysis device；

Fig. 2 is the system structure diagram of primary module；

Fig. 3 is the structural representation of slave module；

Fig. 4 is the structural representation of system backplane bus.

Embodiment

Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the utility model.

The overall structure diagram of power quality analysis device as shown in figure 1, including primary module 1 and 3 slave modules 2,3, 4, each slave module connects primary module 1 using core bus 5.Certainly, the number of slave module is not limited to 3 or 1 It is individual or multiple.When needing to be extended the analytical equipment, it is only necessary to a slave module is installed on circuit to be detected, The slave module is connected by core bus with primary module.Primary module and the concrete structure of slave module are situated between in detail below Continue.

First, primary module

The system structure diagram of primary module is as shown in Fig. 2 the realization of primary module is used at first processor DSP+ second Manage device ARM dual processor framework.Wherein, first processor DSP is responsible for data acquisition and algorithm process, run various harmonic waves, The metering algorithm of the electrical energy parameters such as voltage flicker；Second processor ARM is responsible for communication protocol and man-machine interface processing.Specifically, The double-core high-performance Blackfin processing that DSP Processor is applied using the smart grid-oriented transmission ＆ distribution electrical domain of the newest releases of ADI Device ADSP-BF607, its monokaryon maximum operating frequency can reach 500MHz, and processor ADSP-BF607 software section is using race The mode of bare machine, any operating system is not loaded with, to reach highest data acquisition and computational efficiency, carries out various electricity ginsengs in time Several calculating.Arm processor is a Cortex using South Korea Telechips A5 architecture processors TCC8925, TCC8925 The ARM chips of A5 kernels, its maximum operating frequency can reach 800MHz, and it mainly completes control and the communicative indication of peripheral interface , can finishing device communication protocol processes and external event response in time Deng correlation function；ARM software sections can be based on Android System carries out depth optimization and extends to industrial circle, makes beautiful interface, operation is easier.Processor TCC8925 is marked using PQDIF Quasi- data record format, it is easy to the data exchange of different device and system and function compatible, IEC61850 can be extended.Certainly, First processor DSP+ second processors ARM dual processor framework is identical realizing only as a kind of specific embodiment In the case of function, the processor architecture of other models can also be used.

Second processor ARM is additionally provided with data disaply moudle and for the external communication interface with PERCOM peripheral communication.Its In, LCD display is used for the result of calculation of each related electrical parameters of display system, and external communication interface is used for the monitoring with outside Equipment is communicated, and for carrying out data remote and receiving remote control, realizes remote monitoring.Specifically, data disaply moudle Using LCD display, external communication interface includes RS485 communication interfaces and ethernet interface.

Further, first processor DSP and second processor ARM are provided with external memory storage, for the quality of power supply The storage of a variety of data in monitoring process.As shown in Fig. 2 synchronous DRAM SDRAM is used to store master chip Various system variables needed for Blackfin DSP BF607 operations, storage chip SPI Flash power failure datas are not lost, are used for Preserve substantial amounts of user configuration data.Core bus interface is used for realizing the high-speed data communications between module.DDR3 conducts The memory chip of TCC8925 operations, NAND FLASH save systematic parameter configuration information.Certainly, identical function is being realized In the case of, can also be using the memory of other models.

In addition, second processor ARM be also associated with GPS module, Protection IC, KEY BOARD Keysheet modules and TF card.Wherein, GPS module is used to carry out real-time time service to system；Protection IC modules contain ESAM chips, are stored with For the key of data encryption and decryption, the secrecy transmission of teledata can be realized by the module；KEY BOARD keyboard moulds Block is used for passing through key operation device；TF card is used for preserving each data in system operation, will pass through other platforms Carry out the off-line analysis of data.

Primary module mainly realizes following functions：

(1) human-machine interface function

Giant-screen LCD display is carried on device panel, shows the reality of main electric energy quality monitoring index to graphically When data.Provided with operation keyboard and touch-screen, it can facilitate and the clock of device hardware is configured, monitoring parameters are set Put, change and check, and be provided with cryptoguard.

(2) statistical function

Device has the Online statistics function to main monitoring index, can count in a period (being typically one day) prison Survey the maximum of index, minimum value, average value, 95% maximum probability value etc..

(3) GPS time adjustment functions

Interface when device has hard couple of GPS, signal when can receive IRIG-B codes pair or during pulse per second (PPS) pair, keep with it is remote The clock of square administrative center is consistent, ensure that the synchronized sampling of monitoring device in different substation living in same transformer station.

(4) recording function

For the transient voltage time, device has recording function, can record 20 week before transient voltage event generation time Ripple and rear 20 cycles.

(5) advanced monitoring index

The following parameter of device energy on-line measurement, it is m-Acetyl chlorophosphonazo, voltage pulsation, voltage flicker, voltage swells, voltage dip, short When the parameter such as interruption, temporary overvoltage.

(6) record storage function

Fundamental surveillance index and advanced monitoring index can be preserved in real time, statistics time interval can be set, 3min Data (preservation maximum) most long holding time on device is 3 months, is updated afterwards by first in first out.

(7) communication function

Device provides various communication interfaces mode, realizes the real-time Transmission goods timing extraction stored record of Monitoring Data, can Communicated by Ethernet interface and distant place Power quality management center.

2nd, slave module

The system structure diagram of slave module is as shown in figure 3, the realization of slave module mainly uses FPGA field programmables Logic gate array+AD sampling A/D chip frameworks, are mainly made up of three parts：1st, fpga logic control section；2nd, AD sampling sections；3、 Sampling pretreatment part.Wherein, fpga logic control section uses the EP4CE15F256 chips of altera corp's production, The main control for realizing sampling time sequence, the control of core bus communication and sampling caching and data prediction.AD sampling sections The AD7606 sampling A/D chips produced using ADI companies, the chip are a channel data acquisition systems of integrated form 8, Embedded Input amplifier, overvoltage crowbar, second order simulation frequency overlapped-resistable filter, analog multiplexer, 16 200kSPS SAR ADC and digital filter, it ensure that the system data have very high precision.Sampling pretreatment mainly realizes input letter Conversion, the conversion of current signal to voltage signal of number level, and the amplification and filtering of signal, core is sampled for rear class AD7606 Piece provides a level properly and disturbs the sampled signal of very little.

Further, fpga logic control section is also associated with synchronous DRAM SDRAM, in slave module The storage of data.System power supply, the device being connected with circuit primary side PT/CT to be measured inside PT/ are additionally provided with slave module CT, the system power supply are used to power to sampling pretreatment, and PT/CT uses the accurate PT/ of the bright electronics in Nanjing pool inside device The model ZM-BPT 120V/ of model ZM-BCT100A/3.53V, the PT transformer of CT transformers, wherein CT transformers 3.53V。

Slave module mainly realizes the pretreatment to following electrical parameter metering, and these electrical parameters include：

1) mains frequency：Total active and reactive power and power factor；

2) three-phase fundamental voltage, current effective value, fundamental power, power factor and phase etc.；

3) voltage deviation and frequency departure；

4) non-equilibrium among three phase voltages, three-phase current unbalance degree, negative sequence voltage and electric current；

5) harmonic wave (2-50 times), including the total harmonic distortion factor of voltage, electric current, each harmonic containing ratio, amplitude and phase； Active and reactive power of each harmonic etc..

The operation principle of above-mentioned Power Quality Monitor Device is：

As shown in figure 4, the data between primary module and each slave module pass through core bus transmission.When primary module passes through the back of the body When plate bus is to some slave module transmission data, all core bus controllers being arranged on core bus can all receive always The data transmitted on line, but core bus controller can be carried out according to its address of corresponding slave module in itself to bus data Filter, if the address of the corresponding slave module of the destination address of data is consistent, core bus controller can receive the bus Data, and be passed on the data/address bus inside its corresponding slave module, so as to complete the reception of data.When slave module needs When sending data to primary module, its corresponding core bus controller is passed data to first, core bus can enter to data Row verification and caching, when the slave module obtains the right to use of bus, core bus control is transmitted data on core bus Go, complete the transmission of data.

It should be noted that in data transmission procedure, special core bus can not also be set on core bus Controller, but the function of core bus controller is realized by each slave module.

Claims (7)

1. a kind of equipment for monitoring power quality, it is characterised in that including the primary module for connecting core bus, the primary module Including for connecting core bus, the first processor of circuit electric parameter to be monitored obtained from core bus, and for locating Manage the second processor of the electric parameter, the first processor and second processor communication connection, the second processor It is provided with data disaply moudle and for the external communication interface with PERCOM peripheral communication.

2. equipment for monitoring power quality according to claim 1, it is characterised in that the first processor is DSP processing Device, the second processor are arm processor.

3. equipment for monitoring power quality according to claim 1 or 2, it is characterised in that the first processor and second Processor is respectively connected with external memory storage.

4. equipment for monitoring power quality according to claim 1 or 2, it is characterised in that the data disaply moudle is LCD Display screen.

5. equipment for monitoring power quality according to claim 1 or 2, it is characterised in that the external communication interface includes RS485 communication interfaces and ethernet interface.

6. equipment for monitoring power quality according to claim 1 or 2, it is characterised in that the monitoring device also includes being used for Connect core bus and at least one slave module of circuit electric parameter to be monitored is sent to core bus, the slave module includes Be sequentially connected be used for realize level conversion sampling pretreatment module, for realize the AD sampling modules of AD conversion and filtering with And for realizing the Logic control module of sampling time sequence control；The Logic control module communicates to connect the first processor, The sampling pretreatment module is used to sample the current transformer and voltage transformer for connecting circuit to be monitored.

7. equipment for monitoring power quality according to claim 6, it is characterised in that the Logic control module is provided with outer Portion's memory.