CN103779834A - Grid-connected access anti-reverse-flow intelligent detection method for distributed power generation - Google Patents
Grid-connected access anti-reverse-flow intelligent detection method for distributed power generation Download PDFInfo
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- CN103779834A CN103779834A CN201410011462.3A CN201410011462A CN103779834A CN 103779834 A CN103779834 A CN 103779834A CN 201410011462 A CN201410011462 A CN 201410011462A CN 103779834 A CN103779834 A CN 103779834A
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Abstract
The invention discloses a grid-connected access anti-reverse-flow intelligent detection method for distributed power generation. The method comprises the following steps: A, the three-phase current and the three-phase voltage of a grid-connected point are acquired; B, the three-phase current and the three-phase voltage are digitally processed, and the positive-sequence current and the positive-sequence voltage of the grid-connected point are calculated; C, the angle difference between the positive-sequence current and the positive-sequence voltage is monitored, whether a reverse-power condition occurs is judged, an instruction is issued if a reverse-power condition occurs, and the method returns to step B if no reverse-power condition occurs; and D, a rising edge drive tripping command output module issues a tripping command to a circuit breaker control module to disconnect a circuit breaker of the grid-connected point. According to the method of the invention, the flow direction of output power of a distributed grid-connected power generation system can be sensitively and accurately identified, and a tripping command is issued when reverse power occurs so as to disconnect the circuit breaker of the grid-connected point.
Description
Technical field
The present invention relates to field of relay protection in power, relate in particular to one and be applied to distributed power generation grid integration counterflow-preventing intelligent detecting method.
Background technology
As effectively supplementing of centralized generating, distributed power generation and system integration technology thereof reach its maturity.Along with the continuous decline of per kilowatt electrical energy production price and providing powerful support for of policy aspect, distributed generation technology is just obtaining applying more and more widely.Can operation, control and protection on environment, economy and electric power system produce certain impact because distributed power source and conventional electric power system are incorporated into the power networks, therefore each state is all in the grid-connected standard of formulating distributed power source.The grid-connected interface arrangement of distributed power source is installed on distributed power source and electrical network junction, by the control to grid-connected switch and distributed power source, and the function such as realize distributed electrical source protection, operation control, data acquisition and communicate by letter.
For the distributed generation system of generating power for their own use, the especially inner distributed generation system that contains a large amount of power electronic device, its quality of power supply may not reach the requirement that electric power system is incorporated into the power networks.Therefore, in some areas, power department explicitly calls for distributed generation system to generate electricity can on-site elimination, and not enough electric energy is provided by power distribution network, takes grid-connected mode of not surfing the Net to move.Once occur in running that distributed generation system send the situation of power to power distribution network, should take immediately safeguard measure, within the given time, eliminate inverse probability operating condition, otherwise should cut off immediately grid-connected point breaker.Existing distributed power generation grid integration counterflow-preventing detection method discrimination precision is not high, and inverse probability operating condition often occurs, and causes distributed generation system and the power distribution network cannot safe and stable operation.
Summary of the invention
The object of this invention is to provide one and be applied to distributed power generation grid integration counterflow-preventing intelligent detecting method, can differentiate quickly and accurately distributed generation system inverse probability operation phenomenon, by adjusting instruction to inverter transmitted power, eliminate inverse probability operating condition, safeguard the safe and stable operation of distributed generation system and power distribution network.
The present invention adopts following technical proposals:
One is applied to distributed power generation grid integration counterflow-preventing intelligent detecting method, comprises the following steps:
A: the three-phase current and the three-phase voltage that utilize current acquisition module and voltage acquisition module collection site;
B: the three-phase current and the three-phase voltage that utilize forward-order current computing module and positive sequence voltage computing module respectively current acquisition module and voltage acquisition module to be collected carry out digitized processing, and calculate and forward-order current and the positive sequence voltage of site;
C: utilize adverse current discrimination module to monitor in real time the differential seat angle of forward-order current and positive sequence voltage, judge whether to occur inverse probability operating mode, if there is inverse probability operating mode, adverse current discrimination module drives trip command output module to send instruction to rising edge; If there is not inverse probability operating mode, return to step B;
D: rising edge drives trip command output module to receive after the instruction that adverse current discrimination module sends, and sends trip command to breaker control module, disconnects grid-connected point breaker.
Described C step is further comprising the steps of:
C1: at adverse current discrimination module inner setting forward-order current threshold value and positive sequence voltage threshold value; Utilize adverse current discrimination module to monitor in real time the numerical value of forward-order current and positive sequence voltage; If forward-order current numerical value is greater than forward-order current threshold value and positive sequence voltage numerical value is greater than positive sequence voltage threshold value, enter step C2; If forward-order current numerical value is less than forward-order current threshold value and/or positive sequence voltage numerical value is less than positive sequence voltage threshold value, return to step B;
C2: adverse current discrimination module is monitored the differential seat angle of forward-order current and positive sequence voltage in real time, in the time that the differential seat angle of forward-order current and positive sequence voltage is 88 °, judge inverse probability operating mode occurs, adverse current discrimination module sends high level signal to time timing module, then enters step C3; In the time that the differential seat angle of forward-order current and positive sequence voltage is less than 88 °, adverse current discrimination module sends low level signal to time timing module, then returns to step B;
C3: in the time that time timing module receives the high level signal of adverse current discrimination module transmission, time timing module starts timing; In the time that in the time of setting, the output of adverse current discrimination module is always high level signal, time timing module drives trip command output module to send high level signal to rising edge, then enters step D; In the time that in the time of setting, adverse current discrimination module is output as low level signal, time timing module drives trip command output module to send low level signal to rising edge, then returns to step B.
In described C2 step, judge and occur after inverse probability operating mode when adverse current discrimination module, when adverse current discrimination module sends high level signal to time timing module, adverse current discrimination module is also to pulsed instruction output module transmitted signal, and the current performance number of sending of Real-Time Monitoring; When send performance number be less than adverse current discrimination module internal preset send performance number threshold value time, adverse current discrimination module to the time timing module send low level signal, return to step B.
In described D step, in the time that rising edge drives trip command output module to receive the high level signal that time timing module sends, send trip command to breaker control module, disconnect grid-connected point breaker; In the time that rising edge drives trip command output module to receive the low level signal that time timing module sends, regain trip command to breaker control module.
In described C2 step, when pulsed instruction output module receives after the signal of adverse current discrimination module transmission, pulsed instruction output module is adjusted instruction to inverter power output, and what power adjusted that instruction comprises that power adjusts instruction and adverse current discrimination module internal preset send performance number threshold value.
Described power is adjusted instruction and is adopted pulsed output, and pulsed instruction output module carries out communication by wired or wireless mode and inverter.
Described rising edge drives trip command output module and breaker control module by wired or wireless mode communication.
In described A step, current acquisition module and voltage acquisition module adopt respectively high-acruracy survey level current transformer and voltage transformer.
The present invention utilizes current acquisition module and voltage acquisition module to gather respectively also three-phase current and the three-phase voltage of site, and carry out after digitized processing through forward-order current computing module and positive sequence voltage computing module, calculate also forward-order current and the positive sequence voltage of site, then utilize adverse current discrimination module to monitor in real time the differential seat angle of forward-order current and positive sequence voltage, judge whether to occur inverse probability operating mode, finally driving trip command output module to connect to breaker control module by rising edge sends trip command, disconnects grid-connected point breaker.The power output that the present invention can identify distributed grid-connected electricity generation system sensitive and accurately flows to, and in the time that inverse probability occurs, sends trip command, realizes the disconnection of grid-connected point breaker.Further, the present invention is also by setting up pulsed instruction output module and setting inverse probability operation phenomenon logic determining program, can strengthen the accuracy of differentiation, and adjust signal to inverter output pulsed power, until inverter power output meets service requirement, thereby effectively realize counterflow-preventing control.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Embodiment
As shown in Figure 1, the present invention includes following steps:
A: the three-phase current and the three-phase voltage that utilize current acquisition module and voltage acquisition module collection site.
B: the three-phase current and the three-phase voltage that utilize forward-order current computing module and positive sequence voltage computing module respectively current acquisition module and voltage acquisition module to be collected carry out digitized processing, and calculate and forward-order current and the positive sequence voltage of site.
C: utilize adverse current discrimination module to monitor in real time the differential seat angle of forward-order current and positive sequence voltage, judge whether to occur inverse probability operating mode, if there is inverse probability operating mode, adverse current discrimination module drives trip command output module to send instruction to rising edge; If there is not inverse probability operating mode, return to step B;
D: rising edge drives trip command output module to receive after the instruction that adverse current discrimination module sends, and sends trip command to breaker control module, disconnects grid-connected point breaker.
Due to the early stage of inverse probability operating mode occurring, current phasor approaches mutually vertical with voltage vector, the active power now measuring is close to zero, in order to strengthen the accuracy of differentiation, the present invention, by step C and step D refinement, differentiates quickly and accurately to realize distributed generation system inverse probability operation phenomenon.
C1: at adverse current discrimination module inner setting forward-order current threshold value and positive sequence voltage threshold value; Utilize adverse current discrimination module to monitor in real time the numerical value of forward-order current and positive sequence voltage; If the forward-order current numerical value monitoring is greater than forward-order current threshold value and positive sequence voltage numerical value is greater than positive sequence voltage threshold value, enter step C2; If forward-order current numerical value is less than forward-order current threshold value and/or positive sequence voltage numerical value is less than positive sequence voltage threshold value, return to step B;
C2: adverse current discrimination module is monitored the differential seat angle of forward-order current and positive sequence voltage in real time, in the time that the differential seat angle of forward-order current and positive sequence voltage is 88 °, judge inverse probability operating mode occurs, adverse current discrimination module sends high level signal to time timing module and pulsed instruction output module simultaneously, and the current performance number of giving of Real-Time Monitoring, then enter step C3; In the time that the differential seat angle of forward-order current and positive sequence voltage is less than 88 °, adverse current discrimination module sends low level signal to time timing module, then returns to step B;
C3: in the time that time timing module receives the high level signal of adverse current discrimination module transmission, time timing module starts timing; In the time that in the time of setting, the output of adverse current discrimination module is always high level signal, time timing module drives trip command output module to send high level signal to rising edge, then enters step D; In the time that in the time of setting, adverse current discrimination module is output as low level signal, time timing module drives trip command output module to send low level signal to rising edge, then returns to step B;
Judging after generation inverse probability operating mode the current performance number of sending of adverse current discrimination module Real-Time Monitoring; When send performance number be less than adverse current discrimination module internal preset send performance number threshold value time, adverse current discrimination module to the time timing module send low level signal, return to step B.
D: in the time that rising edge drives trip command output module to receive the high level signal that time timing module sends, send trip command to breaker control module, disconnect grid-connected point breaker; In the time that rising edge drives trip command output module to receive the low level signal that time timing module sends, regain trip command to breaker control module.Rising edge drives trip command output module and breaker control module by wired or wireless mode communication.
In step C1, owing to having set forward-order current threshold value and positive sequence voltage threshold value, only in the time that being all greater than threshold value separately, forward-order current and positive sequence voltage just start adverse current logic determining program, can effectively prevent erroneous judgement or the frequent starting of the adverse current discrimination module when lower at electric current and voltage magnitude, to improve the accuracy of differentiation.
In step C2, in the time that the differential seat angle of forward-order current and positive sequence voltage is 88 °, just judge inverse probability operating mode occurs, can effectively prevent from differentiating inaccurate situation in active power close to appearance in 0 o'clock, thereby strengthen the accuracy of differentiating, also can realize advanced warning, greatly improved the reaction speed of system simultaneously.
In step C3, by setting up time timing module, judge the type of adverse current discrimination module output signal in setting-up time, can prevent from causing the erroneous judgement of adverse current discrimination module because of power fluctuation, also can guarantee that inverter has time enough to carry out power adjustments under inverse probability operating mode, avoid unnecessary tripping operation.
Meanwhile, judging after generation inverse probability operating mode the current performance number of sending of adverse current discrimination module Real-Time Monitoring; When send performance number be less than adverse current discrimination module internal preset send performance number threshold value time, adverse current discrimination module sends low level signal to time timing module, make can trip in time in the time that inverse probability operating mode cannot be eliminated, avoid the safe and stable operation of long-time inverse probability influence on system operation external power grid.
In order further to strengthen the accuracy of differentiating, current acquisition module of the present invention and voltage acquisition module adopt high-precision measurement level current transformer and voltage transformer, can guarantee certainty of measurement, to realize and the accurate collection of site three-phase current and three-phase voltage.
In C2 step of the present invention, when pulsed instruction output module receives after the signal of adverse current discrimination module transmission, pulsed instruction output module is adjusted instruction to inverter power output, and what power adjusted that instruction comprises that power adjusts instruction and adverse current discrimination module internal preset send performance number threshold value; Power is adjusted instruction and is adopted pulsed output, and pulsewidth is set voluntarily by user, and pulsed instruction output module carries out communication by wired or wireless mode and inverter.Inverter is adjusted after instruction and immediately power output is adjusted receiving power output, until power output meets service requirement, realizes counterflow-preventing control.If inverter is not realized the requirement that power is adjusted within the regular hour,, by the judgement processing of adverse current discrimination module, time timing module can send trip command in time, disconnects grid-connected point breaker.
In the present invention, forward-order current computing module, positive sequence voltage computing module, adverse current discrimination module, time timing module, pulsed instruction output module can be equipped with relevant software program by MCS-51 single-chip microcomputer, ARM7 or other Single Chip Microcomputer (SCM) system and be achieved, relevant software program and computational methods are the routine techniques that those skilled in the art grasp, and do not repeat them here.
Claims (8)
1. be applied to a distributed power generation grid integration counterflow-preventing intelligent detecting method, it is characterized in that, comprise the following steps:
A: the three-phase current and the three-phase voltage that utilize current acquisition module and voltage acquisition module collection site;
B: the three-phase current and the three-phase voltage that utilize forward-order current computing module and positive sequence voltage computing module respectively current acquisition module and voltage acquisition module to be collected carry out digitized processing, and calculate and forward-order current and the positive sequence voltage of site;
C: utilize adverse current discrimination module to monitor in real time the differential seat angle of forward-order current and positive sequence voltage, judge whether to occur inverse probability operating mode, if there is inverse probability operating mode, adverse current discrimination module drives trip command output module to send instruction to rising edge; If there is not inverse probability operating mode, return to step B;
D: rising edge drives trip command output module to receive after the instruction that adverse current discrimination module sends, and sends trip command to breaker control module, disconnects grid-connected point breaker.
2. the distributed power generation grid integration counterflow-preventing intelligent detecting method that is applied to according to claim 1, is characterized in that, described C step is further comprising the steps of:
C1: at adverse current discrimination module inner setting forward-order current threshold value and positive sequence voltage threshold value; Utilize adverse current discrimination module to monitor in real time the numerical value of forward-order current and positive sequence voltage; If forward-order current numerical value is greater than forward-order current threshold value and positive sequence voltage numerical value is greater than positive sequence voltage threshold value, enter step C2; If forward-order current numerical value is less than forward-order current threshold value and/or positive sequence voltage numerical value is less than positive sequence voltage threshold value, return to step B;
C2: adverse current discrimination module is monitored the differential seat angle of forward-order current and positive sequence voltage in real time, in the time that the differential seat angle of forward-order current and positive sequence voltage is 88 °, judge inverse probability operating mode occurs, adverse current discrimination module sends high level signal to time timing module, then enters step C3; In the time that the differential seat angle of forward-order current and positive sequence voltage is less than 88 °, adverse current discrimination module sends low level signal to time timing module, then returns to step B;
C3: in the time that time timing module receives the high level signal of adverse current discrimination module transmission, time timing module starts timing; In the time that in the time of setting, the output of adverse current discrimination module is always high level signal, time timing module drives trip command output module to send high level signal to rising edge, then enters step D; In the time that in the time of setting, adverse current discrimination module is output as low level signal, time timing module drives trip command output module to send low level signal to rising edge, then returns to step B.
3. the distributed power generation grid integration counterflow-preventing intelligent detecting method that is applied to according to claim 2, it is characterized in that, in described C2 step, judge and occur after inverse probability operating mode when adverse current discrimination module, when adverse current discrimination module sends high level signal to time timing module, adverse current discrimination module is also to pulsed instruction output module transmitted signal, and the current performance number of sending of Real-Time Monitoring; When send performance number be less than adverse current discrimination module internal preset send performance number threshold value time, adverse current discrimination module to the time timing module send low level signal, return to step B.
4. according to being applied to distributed power generation grid integration counterflow-preventing intelligent detecting method described in claim 2 or 3, it is characterized in that, in described D step, in the time that rising edge drives trip command output module to receive the high level signal that time timing module sends, send trip command to breaker control module, disconnect grid-connected point breaker; In the time that rising edge drives trip command output module to receive the low level signal that time timing module sends, regain trip command to breaker control module.
5. the distributed power generation grid integration counterflow-preventing intelligent detecting method that is applied to according to claim 4, it is characterized in that: in described C2 step, when pulsed instruction output module receives after the signal of adverse current discrimination module transmission, pulsed instruction output module is adjusted instruction to inverter power output, and what power adjusted that instruction comprises that power adjusts instruction and adverse current discrimination module internal preset send performance number threshold value.
6. the distributed power generation grid integration counterflow-preventing intelligent detecting method that is applied to according to claim 5, it is characterized in that: described power is adjusted instruction and adopted pulsed output, and pulsed instruction output module carries out communication by wired or wireless mode and inverter.
7. the distributed power generation grid integration counterflow-preventing intelligent detecting method that is applied to according to claim 6, is characterized in that: described rising edge drives trip command output module and breaker control module by wired or wireless mode communication.
8. the distributed power generation grid integration counterflow-preventing intelligent detecting method that is applied to according to claim 7, is characterized in that: in described A step, current acquisition module and voltage acquisition module adopt respectively high-acruracy survey level current transformer and voltage transformer.
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