CN104808093A - Anti-islanding protection testing circuit and method based on constant impedance load simulation - Google Patents
Anti-islanding protection testing circuit and method based on constant impedance load simulation Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
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Abstract
The invention aims to provide an anti-islanding protection testing circuit based on constant impedance load simulation; the circuit comprises a constant impedance load simulation unit, a monitoring unit and a measuring unit; the input end of the measuring unit is connected with the output end of a grid-connected photovoltaic inverter; the first output end of the measuring unit is connected with a 0.4kV power distribution network; a bypass switch is connected between the input end of the constant impedance load simulation unit and the first output end in parallel; the first input end of the monitoring unit is connected with the second output end of the measuring unit; the second input end of the monitoring unit is connected with the output end of the constant impedance load simulation unit; the third input end of the monitoring unit is connected with the second output end of the bypass switch. The constant impedance load simulation unit accurately simulates load characteristics of a parallel RLC (radio link control) load and feeds an active power output by the grid-connected photovoltaic inverter to the power distribution network in a unit power factor, so that the anti-islanding protection of the grid-connected photovoltaic inverter is enabled to be triggered in testing process; the circuit and the method disclosed by the invention have the advantages of no obvious heating, compact device and the like.
Description
Technical field
The present invention relates to a kind of test circuit, particularly a kind of anti-island protect test circuit based on constant impedance load simulation.
Background technology
Along with distributed photovoltaic power is in a large amount of accesses of power distribution network, the possibility that unplanned property isolated island occurs also increases thereupon.If there is unplanned property isolated island, the safety of distributed photovoltaic power " power transmission " serious threat electric power operation maintenance personnel.Distributed photovoltaic power adopts inverter interface grid-connected, and in order to prevent at the unplanned property isolated island of generation, grid-connected photovoltaic inverter must configure anti-island protect function.At present; generally adopt the anti-island protect function of scheme to grid-connected photovoltaic inverter based on adjustable RLC load to carry out testing authentication, exist device profile excessive, need powerful fan to carry out dispelling the heat, cannot realize that feedback is energy-conservation, long-play degree of regulation declines and be difficult to carry out the problems such as the anti-island protect test job of grid-connected photovoltaic inverter distributed photovoltaic power generation access is on-the-spot.
Adopt the active power exported based on power electronic equipment real-time follow-up grid-connected photovoltaic inverter; the part throttle characteristics of accurate analog RLC constant impedance load; guarantee the anti-island protect triggering grid-connected photovoltaic inverter in test process; the feedback realizing electric energy is energy-conservation, without obvious heating and device compact, there is remarkable advantage.
Summary of the invention
The present invention carries out testing authentication in order to solve to adopt based on the anti-island protect function of scheme to grid-connected photovoltaic inverter of adjustable RLC load; exist device profile excessive, need powerful fan to carry out dispelling the heat, cannot realize that feedback is energy-conservation, long-play degree of regulation declines and be difficult to, in the on-the-spot problem of carrying out the anti-island protect test job of grid-connected photovoltaic inverter of distributed photovoltaic power generation access, propose a kind of anti-island protect test circuit based on constant impedance load simulation.
The present invention realizes by the following technical solutions: based on the anti-island protect test circuit of constant impedance load simulation, it is characterized in that: comprise constant impedance load simulation unit, monitoring unit and measuring unit; The first input end of described measuring unit connects the output of grid-connected photovoltaic inverter; First output terminal of monitoring unit described in second input termination of described measuring unit; First of described measuring unit exports constant impedance load simulation unit described in termination; First of described constant impedance load simulation unit exports and connects power distribution network; Second of described constant impedance load simulation unit exports and connects monitoring unit second input end; Between the input end that described by-pass switch is parallel to constant impedance load simulation unit and the first output terminal; Second of described monitoring unit exports an input of by-pass switch described in termination.
Further, described constant impedance load simulation unit is one based on the three-phase independence full-bridge type AC-DC-AC transverter of IGBT, comprises full-bridge type AC-DC rectification circuit and full-bridge type DC-AC inverter circuit; Described AC-DC rectification circuit is for testing the part throttle characteristics of the RLC load in parallel of the anti-island protect of grid-connected photovoltaic inverter; The active power that input end absorbs is fed to power distribution network with unity power factor by described full-bridge type DC-AC inverter circuit.
In an embodiment of the present invention, also comprise a host computer interface, the 3rd input end of described monitoring unit is connected with described host computer interface.
The present invention also provides a kind of method of testing based on the above-mentioned anti-island protect test circuit based on constant impedance load simulation: comprise the following steps: step S1: send instructions under monitoring unit closes bypass switch, starts grid-connected photovoltaic inverter; Step S2: the active power that unit inspection to be monitored exports to grid-connected photovoltaic inverter steadily after, monitoring unit sends test instruction; Step S3: analog electrical resistance R, the inductance value L, the capacitance C that are calculated RLC load in parallel by monitoring unit, and the reactive power making RLC consume equals the reactive power that grid-connected photovoltaic inverter exports, the active power that RLC consumes equals the active power that tested photovoltaic generating system exports, and the quality factor of RLC resonant circuit are set to 1 ± 0.2; Step S4: step S3 result of calculation is issued to constant impedance load simulation unit, when the active power that grid-connected photovoltaic inverter exports by load simulation unit feeding power distribution network and the fundamental current flowing through by-pass switch is less than 5% of grid-connected photovoltaic inverter output current time, monitoring unit sends instruction bypass switch opens; Step S5: after by-pass switch is disconnected, monitoring unit starts to record test process, electric quantity information will be sent to the host computer outside test circuit simultaneously; Step S6: monitoring unit presets a setting-up time, if detect in setting-up time, the active power that grid-connected photovoltaic inverter exports drops to zero, monitoring unit sends the water conservancy diversion device that load simulation unit is blocked in instruction, preserves test result, go to step S7 by host computer; If exceed setting-up time and the active power that grid-connected photovoltaic inverter exports also does not drop to zero, monitoring unit sends instruction and stops test process, regulates LC, the reactive power that LC is consumed changes at every turn ± and 2%, return step S4; Step S7: analyze test result, judges whether the anti-island protect of grid-connected photovoltaic inverter meets the demands.
Further, step S3 also comprises following concrete steps: step S31: the active-power P exported according to effective value E and the tested grid-connected photovoltaic inverter of the voltage of full-bridge type AC-DC rectification circuit input end
pwith reactive power P
q, calculating simulation resistance value R:R=E
2/ P
pif, reactive power P
qfor just, calculating idle inductance value L
q: L
q=E
2/ ω P
p, otherwise be L
q=0, if reactive power P
qbe negative, calculate idle capacitance C
q: C
q=P
p/ ω E
2, otherwise be C
q=0; Step S32: according to setting value Q, analog electrical resistance R and the idle inductance value L of electric voltage frequency ω during test, quality factor
q, calculating simulation inductance value L:L=L
q+ R/ ω Q; Step S33: the active-power P exported according to the effective value E of the voltage of full-bridge type AC-DC rectification circuit input end, tested grid-connected photovoltaic inverter
p, quality factor setting value Q and test time electric voltage frequency ω, if P
qfor just, calculating simulation capacitance C:C=Q/ω R-P
p/ ω E
2+ C
q; Step S34: according to the voltage e of the analog electrical resistance R, the inductance value L that calculate, capacitance C and full-bridge type AC-DC rectification circuit input end, set up the equation equation of Parallel RLC Circuit: i
r=e
2/ R, e=Ldi
l/ dt, i
c=Cde/dt; Step S35: equation equation in discretize step S34, obtains i
r_n+1=e
n 2/ R, i
l_n+1=2 π e
n/ N ω L+i
l_n, i
c_n+1=N ω C (e
n-e
n-1)/2 π, in formula, N is the sampling number of each cycle of the voltage of full-bridge type AC-DC rectification circuit input end; Step S36: the reference value choosing the input current of full-bridge type AC-DC rectification circuit input end: i
cov_ref=i
r_n+1+ i
l_n+1+ i
c_n+1; The input current controlling unit adoption rate resonance of step S37: full-bridge type AC-DC rectification circuit and Voltage Feedback compensate, and realize i
cov_refaccurate tracking, the part throttle characteristics of accurate analog RLC constant impedance in parallel load; Step S38: stablize full-bridge type DC-AC inverter circuit DC voltage, controls the output current of feedback end, and the active power that grid-connected photovoltaic inverter exports is fed back to power distribution network with unity power factor.
Compared with prior art the present invention has the following advantages: adopt the part throttle characteristics that AC-DC and DC-AC Two Stages, three-phase are independent, the constant impedance load simulation unit accurate analog of modular construction is used for the RLC load in parallel of the anti-island protect of test distributed grid-connected photovoltaic inverter; realize electric energy feedback; dispel the heat without the need to powerful fan; device compact appearance; modular construction can fast be spliced, and is convenient in the on-the-spot anti-island protect test job carrying out grid-connected photovoltaic inverter of distributed photovoltaic power generation access.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is constant impedance load simulation cellular construction schematic diagram.
Fig. 3 is RLC load model in parallel.
Fig. 4 is the process flow diagram of method of testing of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
See Fig. 1, the invention provides a kind of anti-island protect test circuit based on constant impedance load simulation, this test circuit comprises constant impedance load simulation unit, monitoring unit and measuring unit; The first input end of described measuring unit connects the output of grid-connected photovoltaic inverter; First output terminal of monitoring unit described in second input termination of described measuring unit; First of described measuring unit exports constant impedance load simulation unit described in termination; First of described constant impedance load simulation unit exports and connects power distribution network; Second of described constant impedance load simulation unit exports and connects monitoring unit second input end; Between the input end that described by-pass switch is parallel to constant impedance load simulation unit and the first output terminal; Second of described monitoring unit exports an input of by-pass switch described in termination.
Further, described constant impedance load simulation unit is one based on the three-phase independence full-bridge type AC-DC-AC transverter of IGBT, comprises full-bridge type AC-DC rectification circuit and full-bridge type DC-AC inverter circuit.The structure of constant impedance load simulation unit is see Fig. 2.AC-DC rectification circuit is for testing the part throttle characteristics of the RLC load in parallel of the anti-island protect of grid-connected photovoltaic inverter, and RLC load model in parallel as shown in Figure 3.The active power that input end absorbs by described full-bridge type DC-AC inverter circuit is fed to 0.4kV power distribution network with unity power factor.
Preferably this test circuit also comprises a host computer interface, and the 3rd input end of described monitoring unit is connected with described host computer interface.
The present invention also provides a kind of method of testing based on the above-mentioned anti-island protect test circuit based on constant impedance load simulation: comprise the following steps: step S1: send instructions under monitoring unit closes bypass switch, starts grid-connected photovoltaic inverter; Step S2: the active power that unit inspection to be monitored exports to grid-connected photovoltaic inverter steadily after, monitoring unit sends test instruction; Step S3: analog electrical resistance R, the inductance value L, the capacitance C that are calculated RLC load in parallel by monitoring unit, and the reactive power making RLC consume equals the reactive power that grid-connected photovoltaic inverter exports, the active power that RLC consumes equals the active power that tested photovoltaic generating system exports, and the quality factor of RLC resonant circuit are set to 1 ± 0.2; Step S4: step S3 result of calculation is issued to constant impedance load simulation unit, when the active power that grid-connected photovoltaic inverter exports by load simulation unit feeding power distribution network and the fundamental current flowing through by-pass switch is less than 5% of grid-connected photovoltaic inverter output current time, monitoring unit sends instruction bypass switch opens; Step S5: after by-pass switch is disconnected, monitoring unit starts to record test process, electric quantity information will be sent to the host computer outside test circuit simultaneously; Step S6: monitoring unit presets a setting-up time, if detect in setting-up time, the active power that grid-connected photovoltaic inverter exports drops to zero, monitoring unit sends the water conservancy diversion device that load simulation unit is blocked in instruction, preserves test result, go to step S7 by host computer; If exceed setting-up time and the active power that grid-connected photovoltaic inverter exports also does not drop to zero, monitoring unit sends instruction and stops test process, regulates LC, the reactive power that LC is consumed changes at every turn ± and 2%, return step S4; Step S7: analyze test result, judges whether the anti-island protect of grid-connected photovoltaic inverter meets the demands.Process flow diagram of the present invention is see Fig. 4.
Further, step S3 also comprises following concrete steps: step S31: the active-power P exported according to effective value E and the tested grid-connected photovoltaic inverter of the voltage of full-bridge type AC-DC rectification circuit input end
pwith reactive power P
q, calculating simulation resistance value R:R=E
2/ P
pif, reactive power P
qfor just, calculating idle inductance value L
q: L
q=E
2/ ω P
p, otherwise be L
q=0, if reactive power P
qbe negative, calculate idle capacitance C
q: C
q=P
p/ ω E
2, otherwise be C
q=0; Step S32: according to setting value Q, analog electrical resistance R and the idle inductance value L of electric voltage frequency ω during test, quality factor
q, calculating simulation inductance value L:L=L
q+ R/ ω Q; Step S33: the active-power P exported according to the effective value E of the voltage of full-bridge type AC-DC rectification circuit input end, tested grid-connected photovoltaic inverter
p, quality factor setting value Q and test time electric voltage frequency ω, if P
qfor just, calculating simulation capacitance C:C=Q/ω R-P
p/ ω E
2+ C
q; Step S34: according to the voltage e of the analog electrical resistance R, the inductance value L that calculate, capacitance C and full-bridge type AC-DC rectification circuit input end, set up the equation equation of Parallel RLC Circuit: i
r=e
2/ R, e=Ldi
l/ dt, i
c=Cde/dt; Step S35: equation equation in discretize step S34, obtains i
r_n+1=e
n 2/ R, i
l_n+1=2 π e
n/ N ω L+i
l_n, i
c_n+1=N ω C (e
n-e
n-1)/2 π, in formula, N is the sampling number of each cycle of the voltage of full-bridge type AC-DC rectification circuit input end; Step S36: the reference value choosing the input current of full-bridge type AC-DC rectification circuit input end: i
cov_ref=i
r_n+1+ i
l_n+1+ i
c_n+1; The input current controlling unit adoption rate resonance of step S37: full-bridge type AC-DC rectification circuit and Voltage Feedback compensate, and realize i
cov_refaccurate tracking, the part throttle characteristics of accurate analog RLC constant impedance in parallel load; Step S38: stablize full-bridge type DC-AC inverter circuit DC voltage, controls the output current of feedback end, and the active power that grid-connected photovoltaic inverter exports is fed back to power distribution network with unity power factor.Those skilled in the art are found out by the electric current of a upper sampled point, magnitude of voltage and sampling period by step S35, S36, can extrapolate the current reference value of subsequent time.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (5)
1. based on the anti-island protect test circuit of constant impedance load simulation, it is characterized in that: comprise constant impedance load simulation unit, monitoring unit and measuring unit;
The first input end of described measuring unit connects the output of grid-connected photovoltaic inverter; First output terminal of monitoring unit described in second input termination of described measuring unit; First of described measuring unit exports constant impedance load simulation unit described in termination;
First of described constant impedance load simulation unit exports and connects power distribution network; Second of described constant impedance load simulation unit exports and connects monitoring unit second input end;
Between the input end that described by-pass switch is parallel to constant impedance load simulation unit and the first output terminal;
Second of described monitoring unit exports an input of by-pass switch described in termination.
2. the anti-island protect test circuit based on constant impedance load simulation according to claim 1, it is characterized in that: described constant impedance load simulation unit is one based on the three-phase independence full-bridge type AC-DC-AC transverter of IGBT, comprises full-bridge type AC-DC rectification circuit and full-bridge type DC-AC inverter circuit; Described AC-DC rectification circuit is for testing the part throttle characteristics of the RLC load in parallel of the anti-island protect of grid-connected photovoltaic inverter; The active power that input end absorbs is fed to power distribution network with unity power factor by described full-bridge type DC-AC inverter circuit.
3. the anti-island protect test circuit based on constant impedance load simulation according to claim 1, is characterized in that: also comprise a host computer interface, and the 3rd input end of described monitoring unit is connected with described host computer interface.
4., based on the method for testing of the anti-island protect test circuit of the anti-island protect based on constant impedance load simulation according to claim 1, it is characterized in that: comprise the following steps:
Step S1: send instructions under monitoring unit closes bypass switch, starts grid-connected photovoltaic inverter;
Step S2: the active power that unit inspection to be monitored exports to grid-connected photovoltaic inverter steadily after, monitoring unit sends test instruction;
Step S3: analog electrical resistance R, the inductance value L, the capacitance C that are calculated RLC load in parallel by monitoring unit, and the reactive power making RLC consume equals the reactive power that grid-connected photovoltaic inverter exports, the active power that RLC consumes equals the active power that tested photovoltaic generating system exports, and the quality factor of RLC resonant circuit are set to 1 ± 0.2;
Step S4: step S3 result of calculation is issued to constant impedance load simulation unit, when the active power that grid-connected photovoltaic inverter exports by load simulation unit feeding power distribution network and the fundamental current flowing through by-pass switch is less than 5% of grid-connected photovoltaic inverter output current time, monitoring unit sends instruction bypass switch opens;
Step S5: after by-pass switch is disconnected, carry out anti-island protect test, monitoring unit starts to record test process, electric quantity information will be sent to the host computer outside test circuit simultaneously;
Step S6: monitoring unit presets a setting-up time, if detect in setting-up time, the active power that grid-connected photovoltaic inverter exports drops to zero, monitoring unit sends the water conservancy diversion device that load simulation unit is blocked in instruction, preserves test result, go to step S7 by host computer; If exceed setting-up time and the active power that grid-connected photovoltaic inverter exports also does not drop to zero, monitoring unit sends instruction and stops test process, regulates LC, the reactive power that LC is consumed changes at every turn ± and 2%, return step S4;
Step S7: analyze test result, judges whether the anti-island protect of grid-connected photovoltaic inverter meets the demands.
5. the anti-island protect method of testing based on constant impedance load simulation according to claim 4, is characterized in that: step S3 also comprises following concrete steps:
Step S31: the active-power P exported according to effective value E and the tested grid-connected photovoltaic inverter of the voltage of full-bridge type AC-DC rectification circuit input end
pwith reactive power P
q, calculating simulation resistance value R:R=E
2/ P
pif, reactive power P
qfor just, calculating idle inductance value L
q: L
q=E
2/ ω P
p, otherwise be L
q=0, if reactive power P
qbe negative, calculate idle capacitance C
q: C
q=P
p/ ω E
2, otherwise be C
q=0;
Step S32: according to setting value Q, analog electrical resistance R and the idle inductance value L of electric voltage frequency ω during test, quality factor
q, calculating simulation inductance value L:L=L
q+ R/ ω Q;
Step S33: the active-power P exported according to the effective value E of the voltage of full-bridge type AC-DC rectification circuit input end, tested grid-connected photovoltaic inverter
p, quality factor setting value Q and test time electric voltage frequency ω, if P
qfor just, calculating simulation capacitance C:C=Q/ω R-P
p/ ω E
2+ C
q;
Step S34: according to the voltage e of the analog electrical resistance R, the inductance value L that calculate, capacitance C and full-bridge type AC-DC rectification circuit input end, set up the equation equation of Parallel RLC Circuit: i
r=e
2/ R, e=Ldi
l/ dt, i
c=Cde/dt;
Step S35: equation equation in discretize step S34, obtains i
r_n+1=e
n 2/ R, i
l_n+1=2 π e
n/ N ω L+i
l_n, i
c_n+1=N ω C (e
n-e
n-1)/2 π, in formula, N is the sampling number of each cycle of the voltage of full-bridge type AC-DC rectification circuit input end;
Step S36: the reference value choosing the input current of full-bridge type AC-DC rectification circuit input end: i
cov_ref=i
r_n+1+ i
l_n+1+ i
c_n+1;
The input current controlling unit adoption rate resonance of step S37: full-bridge type AC-DC rectification circuit and Voltage Feedback compensate, and realize i
cov_refaccurate tracking, the part throttle characteristics of accurate analog RLC constant impedance in parallel load;
Step S38: stablize full-bridge type DC-AC inverter circuit DC voltage, controls the output current of feedback end, and the active power that grid-connected photovoltaic inverter exports is fed back to power distribution network with unity power factor.
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| CN104808093B (en) | 2017-10-20 |
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