CN104158214B - Micro-grid connection control method based on technology of frequency tracking - Google Patents

Micro-grid connection control method based on technology of frequency tracking Download PDF

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Publication number
CN104158214B
CN104158214B CN201410391910.7A CN201410391910A CN104158214B CN 104158214 B CN104158214 B CN 104158214B CN 201410391910 A CN201410391910 A CN 201410391910A CN 104158214 B CN104158214 B CN 104158214B
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China
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micro
frequency
grid
capacitance sensor
value
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CN201410391910.7A
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Chinese (zh)
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CN104158214A (en
Inventor
张磐
庄剑
杜红卫
赵洪磊
郭凌旭
陈建
项添春
于建成
李国栋
王旭东
姜宁
唐萍
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国家电网公司
国网天津市电力公司
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Abstract

The present invention relates to a kind of micro-grid connection control method based on technology of frequency tracking, its technical characteristics is: linked together with grid-connected point breaker by micro-grid connection controller;Main grid side and micro-capacitance sensor side frequency is gathered, the frequency-splitting of both sides and the frequency of cycle when calculating simultaneous interconnecting by frequency senser;Obtain the three-phase voltage current value of micro-capacitance sensor side and main grid side phase voltage current value by data acquisition unit collection, and carry out the measurement processing that micro-capacitance sensor side is meritorious, idle and electric energy is from first-harmonic to higher harmonic components;Calculate micro-capacitance sensor and the voltage difference of main grid side, phase difference value, frequency-splitting, carry out grid-connected combined floodgate process.The present invention uses the technology of frequency tracking adjustment sampling period to carry out data acquisition, can accurately measure micro-capacitance sensor side voltage and accurate judgement is grid-connected, off-grid condition, there is practical, reliability and accuracy high, meet user to the quality of power supply and power supply safety requirement.

Description

Micro-grid connection control method based on technology of frequency tracking

Technical field

The invention belongs to micro-capacitance sensor technical field, a kind of micro-grid connection based on technology of frequency tracking Control method.

Background technology

Along with the gradually exhaustion of conventional energy resource and day by day increasing the weight of of environmental pollution, countries in the world growing interest is distributed Formula generation technology.Constantly bringing forth new ideas of distributed generation technology, distributed electrical Source Type develop into mainly include micro- Combustion engine, solar-energy photo-voltaic cell, wind-driven generator, accumulator, flywheel etc..Weight as distributed power generation Want composition form, micro-capacitance sensor generally by distributed power source, energy storage device, energy converter, associated loadings, Small-sized the distribution system that monitoring system, protection system, power transmitting device etc. collect, is an energy Enough realize self-contr ol, the autonomous system protected and manage.

Micro-capacitance sensor both can form a large-scale power grid and little by power distribution network and large-scale power net parallel running The combined operation system of type electrical network, it is also possible to independently be local load and electricity needs is provided.At main electrical network just Often under state, micro-capacitance sensor needs steady in a long-term operation;When bulk power grid fault, micro-capacitance sensor must be rapidly separated Main electrical network, enters and is held in islet operation, and after bulk power grid failture evacuation, auto-parallel runs again;When When micro-capacitance sensor breaks down, need also exist for quickly excising micro-capacitance sensor.Owing to some in micro-capacitance sensor are distributed Power supply, such as wind-power electricity generation and solar electrical energy generation, is affected very big by outside climatic condition, and frequency often fluctuates and leads Causing the error of sampling, therefore, it is the most in the urgent need to address for how stablizing, to be reliably carried out micro-grid connection Problem.

Summary of the invention

It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of reasonable in design, reliable and stable Micro-grid connection control method based on technology of frequency tracking.

The present invention solves it and technical problem is that and take techniques below scheme to realize:

A kind of micro-grid connection control method based on technology of frequency tracking, comprises the following steps:

Step 1, it is connected having micro-grid connection controller based on technology of frequency tracking with grid-connected point breaker Together;

Step 2, micro-grid connection controller gather main grid side and micro-capacitance sensor side frequency by frequency senser, meter The frequency-splitting of both sides and the frequency of cycle when calculating simultaneous interconnecting;

Step 3, micro-grid connection controller obtain the three-phase voltage of micro-capacitance sensor side by data acquisition unit collection Current value and main grid side phase voltage current value, and carry out that micro-capacitance sensor side is meritorious, idle and electric energy from first-harmonic to The measurement processing of higher harmonic components, data acquisition obtains logical flow chart such as Fig. 4;

Step 4, micro-grid connection controller calculate micro-capacitance sensor and the voltage difference of main grid side, phase difference value, Frequency-splitting, meets difference on the frequency at the same time and is not more than the frequency-splitting F same periodHQmax, voltage difference be not more than the same period electricity Pressure reduction working value UHQmax, the angle same period be not more than the differential seat angle working value Ang same periodHQmaxUnder conditions of, receive grid-connected Close a floodgate and order, carry out grid-connected combined floodgate process, logic diagram such as Fig. 5.

And, described step 1 micro-grid connection controller with grid-connected point breaker mode is: this micro-capacitance sensor is also Net controller gathers remote signalling amount information, by outputing unit by opening to be connected with grid-connected point breaker into unit Be connected output guidance command with grid-connected point breaker, is connected to main grid side and micro-capacitance sensor by frequency senser Side is used for measuring main grid side and micro-capacitance sensor side frequency, by Data Data collecting unit and main grid side and micro- Grid side is connected the telemetered signal amount for gathering main grid side and micro-capacitance sensor, by communication unit and micro-electricity Net controller is connected and interacts control function.

And, described step 3 carries out that micro-capacitance sensor side is meritorious, idle and electric energy is from first-harmonic to higher harmonic components The method of measurement processing be: use high-speed and high-density synchronized sampling, automatic frequency tracking and the FFT of improvement Algorithm.

And, described employing high-speed and high-density synchronized sampling, automatic frequency tracking and the fft algorithm of improvement Method particularly includes: when mains frequency is constant for 50Hz, one cycle 32 point sampling of employing;When frequency occurs During change, the sampled value of of ac uses a Lagrange's interpolation algorithm to revise in real time, it is thus achieved that new Sample sequence, then use fft algorithm, thus complete that micro-capacitance sensor side is meritorious, idle and electric energy is from first-harmonic to height The measurement of order harmonic components and process.

And, when described step 4 carries out the process of grid-connected combined floodgate, to difference on the frequency, voltage difference definite value, the angle same period Definite value and time definite value are individually adjusted, and its setting principle is: synchronous voltage difference working value UHQmaxTake 5V~ 10V, the same period differential seat angle working value AngHQmaxTake 5 °~10 °, the same period difference on the frequency working value FHQmaxTake 1Hz~2Hz, Operation time limit Tnp takes 2s~3s.

Advantages of the present invention and good effect be:

1, the present invention uses the technology of frequency tracking adjustment sampling period to carry out data acquisition, overcomes in micro-capacitance sensor Some distributed power sources affected very big, frequency by outside climatic condition and often fluctuate and cause sampling error problem, Can accurately measure micro-capacitance sensor side voltage and accurate judgement is grid-connected, off-grid condition, have practical, Reliability and accuracy high, meet user to the quality of power supply and power supply safety requirement.

2, the present invention uses micro-grid connection controller to enter micro-grid connection point remote signalling, remote measurement, remote-control data Row effective monitoring, it is achieved comprehensive monitoring and the defencive function to micro-capacitance sensor, there is data acquisition, electric energy is copied and accepted, Isolated island protection, failure removal, abnormal information warning, switching control, cutting-in control, electric energy quality monitoring Deng integrated function, it is ensured that network system properly functioning.

Accompanying drawing explanation

Fig. 1 is the circuit block diagram of the micro-grid connection controller that the present invention uses;

Fig. 2 is frequency senser circuit theory diagrams;

Fig. 3 is that the signal of frequency senser changes schematic diagram;

Fig. 4 is that the sample sequence of the present invention obtains logical flow chart;

Fig. 5 is the simultaneous interconnecting of the present invention, off-grid process logic diagram.

Detailed description of the invention

Below in conjunction with accompanying drawing, the embodiment of the present invention is further described:

A kind of micro-grid connection control method based on technology of frequency tracking, comprises the following steps:

Step 1: be connected having micro-grid connection controller based on technology of frequency tracking with grid-connected point breaker Together.

This control method is to be linked into micro-capacitance sensor by having micro-grid connection controller based on technology of frequency tracking In realize micro-grid connection control function.This micro-grid connection controller is by opening into unit and also site open circuit Device is connected and gathers remote signalling amount information, is connected with main grid side and micro-capacitance sensor side by Data Data collecting unit Connect the telemetered signal amount for gathering main grid side and micro-capacitance sensor, by possessing the frequency measurement list of technology of frequency tracking Unit is connected to main grid side and micro-capacitance sensor side for measuring main grid side and micro-capacitance sensor side frequency, by outputing list First and grid-connected point breaker is connected output guidance command, is controlled grid-connected point breaker divide-shut brake function, It is connected with micro-capacitance sensor controller by communication unit and interacts control function.

As it is shown in figure 1, micro-grid connection controller include CPU element, power subsystem, external memory storage, Communication unit, frequency senser, data acquisition unit, open into unit, output unit, human and machine interface unit and JTAG emulation interface unit, CPU element respectively with power subsystem, external memory storage, communication unit, frequency measurement Unit, data acquisition unit, open into unit, output unit, human and machine interface unit and JTAG emulation interface list Unit is connected.In the present embodiment, CPU element use LPC2214 microcontroller, this microcontroller be based on The microcontroller of one 16/32 ARM7TDMI-STMCPU supporting real-time simulation and tracking, and with The high speed flash storage dominant frequency that 256KB embeds, up to 60MHz, extends out 4Mb external RAM and runs program, And EEPROM storage circuit (external memory storage) extending out 512Kb is used for storing data, logout etc.. Described communication unit uses RS232 or RS485 module and can communicate with host computer.Described is man-machine Boundary element comprises liquid crystal display, LED stand by lamp shows and key-press input.JTAG emulation interface unit conduct One emulation interface realizes software debugging and upgrade function for being connected with outer computer.Open into unit bag Include six tunnel remote signalling amount input blocks, be used for gathering grid-connected point breaker position signalling, energy storing of switch warning signal And distributed electrical source inventer warning signal etc. ,+12V level inputs after RC network anti-interference filtration, by Light-coupled isolation conversion is input to CPU element, and CPU element often scans I/O signals collecting through a time interval Obtain.Outputing unit and include four tunnel remote control output units, every road remote control second mate's idle contact exports, and can be set to Two road normal opened contacts, two road normally closed contacts or a road is normally opened, a road normally closed contact, main actions output closes a floodgate, Output tripping operation and alarm output, control for chopper, the conjunction of electric knife gate, jumping.Four tunnel remote controls are corresponding Switching controls, failure removal function, and wherein a road is used as simultaneous interconnecting control.

Step 2: micro-grid connection controller gathers main grid side and micro-capacitance sensor side frequency by frequency senser, meter The frequency-splitting of both sides and frequency f of cycle when calculating simultaneous interconnecting.

The frequency senser of micro-grid connection controller is used for measuring main grid side and micro-capacitance sensor side frequency, main electrical network The collection default condition of side frequency is on the basis of A phase voltage, it is contemplated that micro-capacitance sensor three-phase imbalance problem can Energy property, needs to measure micro-capacitance sensor three-phase voltage frequency, gathers the data obtained and calculates both sides when simultaneous interconnecting Frequency-splitting.As in figure 2 it is shown, frequency senser includes Zero-cross comparator transport and placing device LM258 and optocoupler HCPL-070L, micro-capacitance sensor three-phase and main electrical network A phase, through the voltage AC signal of PT secondary side, input U13 Zero-cross comparator transport and placing device LM258, output low level 0V, high level+12V voltage, then through U15 optocoupler HCPL-070L isolates, and is converted to the analog quantity of unipolarity 0~+3.3V, and input ARM captures pin, wherein R37 is that 5.1K Ω is used as current limliting, and R40 is that 10K Ω is used as to draw high signal CAP1.As it is shown on figure 3, frequency measurement list Unit change output signal receive the grabber 1 input CAPl.0 of CPU element, CAPl.1, CAPl.2, The time base T1 of grabber made by CAPl.3, Timer1 intervalometer, grabber can capture two pulse spacings time Between (representing by variation delta T of Timer1 enumerator), system clock frequency fPCLK, so can calculate The cycle of cycle and frequency f, computing formula is:

F=fPCLK/ΔT (1)

Step 3: micro-grid connection controller obtains the three-phase voltage of micro-capacitance sensor side by data acquisition unit collection Current value and main grid side phase voltage current value, and complete that micro-capacitance sensor side is meritorious, idle and electric energy from first-harmonic to The measurement of higher harmonic components and process.

The data acquisition unit of micro-grid connection controller comprises collection pretreatment and A/D modular converter, gathers Eight tunnel telemetered signal amounts, comprise grid side A phase voltage, electric current, the three-phase voltage of micro-capacitance sensor side, electric current. Remote measurement amount can by the high-precision current in terminal and voltage transformer by strong ac signal (5A/100V) no Distortion it is changed into internal weak electric signal, enters A/D chip after filtered process and carry out analog digital conversion, through turning Digital signal after changing calculates through CUP unit (ARM), it is thus achieved that the three-phase voltage current value of micro-capacitance sensor side and master Grid side phase voltage current value.This telemetered signal amount processes and have employed high-speed and high-density synchronized sampling, frequency certainly Motion tracking technology also has the fft algorithm improved, so precision is fully guaranteed, it is possible to complete micro-capacitance sensor side Meritorious, idle and measurement that electric energy is from first-harmonic to higher harmonic components and process.

In AC sample system, owing to using fft algorithm, it is common that a cycle is sampled 32 points, 64 points Or the charge value of 128, then these data are processed.If mains frequency is constant, then between sampling Every TS=T/N (T is the cycle, and N is sampled point), and in the case of the frequency of micro-capacitance sensor generally has certain fluctuation, Fixed sample interval down-sampling is counted and is not fixed, so wanting Adjustable calculation method.This remote measurement is according to electrical network frequency Rate constant for 50Hz, use cycle 32 point sampling, then the sampling interval is:

TS=0.02s/32=625 μ s (2)

Within 625 μ s sampling intervals, the 32 point sampling sequences obtained through the sampling of A/D chip are X (k) (k=0,1,2 ..., 31).When frequency changes, the sampled value of of ac uses Lagrangian Arithmetic Revise in real time, it is thus achieved that new sample sequence, it is ensured that the precision that of ac calculates.

Lagrange interpolation uses the method for function approximation, tries to achieve interpolation point by building multinomial.Work as structure When the degree of polynomial is the highest, then interpolation error is the least.In actual applications, it is contemplated that operand is convenient and inserts The allowed band of value error, we generally use a Lagrange interpolation algorithm (linear interpolation), can obtain Obtain promising result.It is located at fSThe sample sequence obtained under the fixed sampling frequency of=50Hz is X (k)=x (kTS) (k=0,1,2 ..., 31), the frequency of micro-capacitance sensor voltage signal has been recorded by frequency senser algorithm For f, the corresponding sampling period is T ', and its preferable sample sequence should be

Y (k)=x (kT ')=x [kfS/(fTS))] (3)

Due to kfS/(fTS) it is generally not integer, therefore adjacent two can click on line linearity interpolation at it.If A=kfS/ f, and set b and be less than the maximum integer of a, y (k) is linearly inserted between u (b) and u (b+1) Value, so obtain new sample sequence y (k) (k=0,1,2 ..., 31), then use fft algorithm, finally calculate Main grid side A phase voltage electric current, calculates micro-capacitance sensor side three-phase voltage current from first-harmonic to higher harmonic components, Process acquisition is meritorious, idle.

Step 4: micro-grid connection controller calculate micro-capacitance sensor and the voltage difference of main grid side, phase difference value, Frequency-splitting, meets difference on the frequency at the same time and is not more than the frequency-splitting F same periodHQmax, voltage difference be not more than the same period electricity Pressure reduction working value UHQmax, the angle same period be not more than the differential seat angle working value Ang same periodHQmaxUnder conditions of, receive grid-connected Close a floodgate and order, carry out grid-connected combined floodgate process.

In this step, in order to reduce the impact that electrical network is caused by micro-grid connection, it is desirable to configuration simultaneous interconnecting Function.During the same period, it is desirable to distributed power source Generation Side and the difference on the frequency of power distribution network side and voltage difference meet certain Requirement.According to data sampling and operation result, record micro-capacitance sensor three-phase voltage current and main grid side A phase Amplitude, phase angle, frequency values, calculate micro-capacitance sensor and the voltage difference of main grid side, phase difference value, frequency Difference.Meet difference on the frequency at the same time and be not more than FHQmax, voltage difference be not more than definite value UHQmax, the same period angle be not more than Definite value AngHQmaxUnder conditions of, receive grid-connected order of closing a floodgate, carry out grid-connected combined floodgate process.Simultaneous interconnecting and de- Net action logic is as it is shown in figure 5, difference on the frequency, voltage difference definite value, the angle definite value same period and time definite value can be independent Adjust, setting principle: synchronous voltage difference working value UHQmaxDesirable (5~10) V, the same period differential seat angle working value AngHQmaxDesirable (5~10), the same period difference on the frequency working value FHQmaxDesirable (1~2) Hz, operation time limit Tnp Desirable 2~3S.

It is emphasized that embodiment of the present invention is illustrative rather than determinate, therefore The present invention includes the embodiment being not limited to described in detailed description of the invention, every by those skilled in the art's root Other embodiments drawn according to technical scheme, also belong to the scope of protection of the invention.

Claims (1)

1. a micro-grid connection control method based on technology of frequency tracking, it is characterised in that comprise the following steps:
Step 1, link together having micro-grid connection controller based on technology of frequency tracking with grid-connected point breaker, method particularly includes: this micro-grid connection controller gathers remote signalling amount information by opening to be connected with grid-connected point breaker into unit, it is connected with grid-connected point breaker output guidance command by outputing unit, it is connected to main grid side and micro-capacitance sensor side for measuring main grid side and micro-capacitance sensor side frequency by frequency senser, it is connected with main grid side and micro-capacitance sensor side the telemetered signal amount for gathering main grid side and micro-capacitance sensor by data acquisition unit, it is connected with micro-capacitance sensor controller by communication unit and interacts control function;
Step 2, micro-grid connection controller gather main grid side and micro-capacitance sensor side frequency by frequency senser, the frequency-splitting of both sides and the frequency of cycle when calculating simultaneous interconnecting;
Step 3, micro-grid connection controller obtain the three-phase voltage current value of micro-capacitance sensor side and main grid side phase voltage current value by data acquisition unit collection, and carry out the measurement processing that micro-capacitance sensor side is meritorious, idle and electric energy is from first-harmonic to higher harmonic components;Described carry out the measurement processing that micro-capacitance sensor side is meritorious, idle and electric energy is from first-harmonic to higher harmonic components method be: use high-speed and high-density synchronized sampling, automatic frequency tracking and the fft algorithm of improvement, this fft algorithm method particularly includes: when mains frequency constant for 50Hz, use cycle 32 point sampling;When frequency changes, the sampled value of of ac uses a Lagrange's interpolation algorithm to revise in real time, obtain new sample sequence, then use fft algorithm, thus complete measurement and the process that micro-capacitance sensor side is meritorious, idle and electric energy is from first-harmonic to higher harmonic components;
Step 4, micro-grid connection controller calculate micro-capacitance sensor and the voltage difference of main grid side, phase difference value, frequency-splitting, meet difference on the frequency at the same time and are not more than the frequency-splitting F same periodHQMAX, voltage difference be not more than synchronous voltage difference working value UHQMAX, the angle same period be not more than the differential seat angle working value Ang same periodHQMAXUnder conditions of, to receive grid-connected order of closing a floodgate, carry out grid-connected combined floodgate process, when carrying out grid-connected combined floodgate and processing, difference on the frequency, voltage difference definite value, the angle definite value same period and time definite value are individually adjusted, its setting principle is: synchronous voltage difference working value UHQMAXTake 5V~10V, the same period differential seat angle working value AngHQMAXTake 5 °~10 °, the same period difference on the frequency working value FHQMAXTake 1Hz~2Hz, operation time limit TnpTake 2s~3s.
CN201410391910.7A 2014-08-11 2014-08-11 Micro-grid connection control method based on technology of frequency tracking CN104158214B (en)

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CN104578013B (en) * 2015-01-20 2017-11-28 西安理工大学 A kind of direction protection method of the power distribution network containing DFIG based on power frequency difference
CN105162122A (en) * 2015-08-24 2015-12-16 国网天津静海供电有限公司 Anti-harmonic safety protection system for photovoltaic power generation equipment
CN105738700A (en) * 2016-05-05 2016-07-06 杭州国电能源环境设计研究院有限公司 Photovoltaic grid-connected inverter synchronous controlling and harmonic monitoring device
CN107255745B (en) * 2017-06-28 2020-08-25 华自科技股份有限公司 Voltage measuring method, voltage measuring device, storage medium and computer equipment thereof

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JP5100764B2 (en) * 2010-02-05 2012-12-19 中国電力株式会社 Method for measuring system frequency characteristic constant in power system and information processing apparatus used therefor
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CN102998527B (en) * 2012-11-26 2016-03-30 上海电力学院 Passband type first-harmonic, harmonic wave, DC component detection method
CN103066621B (en) * 2012-12-25 2014-10-08 合肥工业大学 Static switch and control method applied to connection of microgrid and public supply network

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