CN102510081B - Zero-cross control circuit, method and system of photovoltaic network disconnection relay - Google Patents
Zero-cross control circuit, method and system of photovoltaic network disconnection relay Download PDFInfo
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Abstract
The embodiment of the invention provides a zero-cross control circuit, method and system of a photovoltaic network disconnection relay for controlling the connection or disconnection between an inverter side circuit and a power grid side circuit when the inverter current crosses zero. The zero-cross control circuit of the photovoltaic network disconnection relay comprises an inverter output current detection circuit, a master control DSP (digital signal processor) circuit, a relay drive circuit and a relay circuit, wherein the inverter output current detection circuit is used for detecting the output current of the inverter side circuit, and outputting a current signal proportional to the output current of the inverter side circuit; the master control DSP circuit is used for receiving the current signal proportional to the output current of the inverter side circuit, detecting a zero-cross point of the current signal proportional to the output current of the inverter side circuit, and outputting a level signal; the relay drive circuit is used for converting the level signal into a switch control signal, and controlling a relay drive signal to connect or disconnect the relay circuit; and the relay circuit is used for controlling the connection or disconnection between the inverter side circuit and the power grid side circuit through the connection or disconnection thereof.
Description
Technical field
The present invention relates to field of electric control, be specifically related to a kind of photovoltaic broken network relay zero crossing control circuit, method and system.
Background technology
Existing photovoltaic DC-to-AC converter, all needs when use by switch control access electrical network.Photovoltaic DC-to-AC converter below 15KW, because the reason of cost and volume generally adopts relay to access electrical network as switch.
Relay, as the Primary Component of photovoltaic DC-to-AC converter, is made up of iron core, coil, armature, contact reed etc.As long as add certain voltage at coil two ends, in coil, will flow through certain electric current, thereby produce galvanomagnetic effect, make normally opened contact adhesive.When after coil blackout, galvanomagnetic effect disappears, and normally opened contact discharges.Conventionally adopt access or the disconnection of two group relay control inverter sides and grid side, in the time breaking down for one group, another group can also be cut off electrical network, ensures the fail safe of controlling.As shown in Figure 1, K1, K3, K5 and K7 are group relaies, K2, K4, K6 and K8 are another group relaies, K1 is connected inverter side L1 and grid side AC_L1 with after K2 series connection, K3 is connected inverter side L2 and grid side AC_L2 with after K4 series connection, K5 is connected inverter side L3 and grid side AC_L3 with after K6 series connection, K7 and K8 are connected in series inverter side center line N and grid side center line AC_N, every group relay shares a control signal control, K1, K3, K5 and K7 adopt JDK1 to control, K2, K4, K6 and K8 adopt JDK2 to control, by JDK1 and JDK2 control inverter side three-phase input L1 simultaneously, L2, L3 and center line N and grid side access or disconnection.
Adopt this kind of scheme control, because there is time delay in signals transmission, can cause relay in the time of inverter output current zero passage, not turn on and off.In the time having electric current to disconnect, the contact of relay tends to produce arcing phenomenon, causes its contact that oxidation or impaired occurs, and uses for a long time, can make relay contact adhesion, makes inverter can not disconnect the connection of electrical network, easily produces security incident.Simultaneously, adopt control signal control one group relay, a control signal is controlled three-phase input and center line simultaneously, due to three-phase input and center line in inverter side circuit is not to arrive current zero-crossing point simultaneously, can cause in a switch, the relay that may only have a road is to move in the time of current zero-crossing point, and other are not to move in the time of current zero-crossing point, have contact oxidation or impaired problem.
Summary of the invention
The embodiment of the present invention provides a kind of photovoltaic broken network relay zero crossing control circuit and method, and inverter side circuit and the access of grid side circuit or disconnect when being controlled at inverter current zero passage, extend relay useful life and increase circuit safety.
The embodiment of the present invention provides again a kind of three-phase photovoltaic broken network relay zero crossing control system, be used for adopting the independently each relay of control signal control, ensure that each relay contact can be in the action of inverter side circuit output current zero passage moment, extend relay useful life and increase circuit safety.
A kind of photovoltaic broken network relay zero crossing control circuit providing according to the embodiment of the present invention, for access or the disconnection of control inverter lateral circuit and grid side circuit, it is characterized in that, comprise inverter output current detection circuit, master control Digital Signal Processing DSP circuit, relay drive circuit and relay circuit
Described inverter output current detection circuit is for detection of the output current of described inverter side circuit, the proportional current signal of output current of output one and inverter side circuit;
Described master control DSP circuit is for receiving the proportional current signal of output current described and inverter side circuit, detect the zero crossing of the proportional current signal of output current of described and inverter side circuit, and described zero crossing is set to the first delay time, after described the first delay time arrives, outputs level signals;
Described relay drive circuit is for converting described level signal to switch controlling signal, and control relay drives signal to be switched on or switched off described relay circuit;
Described relay circuit is for being switched on or switched off access or the disconnection of control inverter lateral circuit and grid side circuit by it.
A kind of photovoltaic broken network relay zero crossing control method providing according to further embodiment of this invention, for passing through access or the disconnection of relay circuit control inverter lateral circuit and grid side circuit, comprises the following steps:
Detect the output current of described inverter side circuit, output one and the proportional current signal of output current of inverter side circuit;
Receive described and the proportional current signal of inverter side circuit output current, detect zero crossing described and the proportional current signal of inverter side circuit output current, and described zero crossing is set to the first delay time, and after described the first delay time arrives, outputs level signals;
Convert described level signal to switch controlling signal, control relay drives signal to be switched on or switched off described relay circuit;
Be used for by the access or the disconnection that are switched on or switched off control inverter lateral circuit and grid side circuit of relay circuit.
A kind of three-phase photovoltaic broken network relay zero crossing control system providing according to further embodiment of this invention, inverter side circuit is exported with a center line and is connected with grid side circuit by three-phase,
Adopt two group relay groups to be connected control to described inverter side circuit with described grid side circuit, each self-contained four relays of every group relay group are controlled three-phase output and center line four road signals respectively, two relays series connection corresponding in the signal of every road arrange, described each relay adopt one independently photovoltaic broken network relay zero crossing control circuit as described in the present embodiment of the invention control.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
(1) outputs level signals after the first delay time detected after output current zero crossing, outputs level signals to described relay circuit is switched on or switched off and has the second delay time, the first delay time and the second delay time are arranged to the half period time of inverter side electric current, can ensure that relay is switched on or switched off at output current zero crossing, avoid arcing phenomenon, relay contact can not turn on and off when having electric current and produce contact oxidation and adhesion, has ensured the fail safe of Control;
(2) each relay adopts independent control signal to carry out current zero-crossing point turn-on and turn-off, can ensure that each road relay is all switched on or switched off in the time of zero current, has ensured the fail safe of each road Control.
Brief description of the drawings
Fig. 1 is prior art network relay structural representation;
Fig. 2 is the theory diagram of embodiment of the present invention photovoltaic broken network relay zero crossing control circuit;
Fig. 3 is the theory diagram of inverter output current detection circuit in embodiment of the present invention photovoltaic broken network relay zero crossing control circuit;
Fig. 4 is the circuit theory diagrams of inverter output current detection circuit in embodiment of the present invention photovoltaic broken network relay zero crossing control circuit;
Fig. 5 is the theory diagram of embodiment of the present invention photovoltaic broken network relay zero crossing control circuit repeat circuit drive circuit;
Fig. 6 is the circuit theory diagrams of embodiment of the present invention photovoltaic broken network relay zero crossing control circuit repeat circuit drive circuit;
Fig. 7 is embodiment of the present invention photovoltaic broken network relay zero crossing control method flow chart;
Fig. 8 is embodiment of the present invention three-phase photovoltaic broken network relay zero crossing control system structural representation.
Embodiment
The embodiment of the present invention provides a kind of photovoltaic broken network relay zero crossing control circuit and method, inverter side circuit and the access of grid side circuit or disconnect when being controlled at inverter current zero passage.
The embodiment of the present invention provides again a kind of photovoltaic broken network relay zero crossing control system, for adopting the independently each relay of control signal control, ensures that each relay contact can move in the inverter side circuit output current zero passage moment.
Below in conjunction with accompanying drawing, several preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any in marrow of the present invention and scope, make substitute, amendment, equivalent method and scheme.In order to make the public that the present invention is had thoroughly and be understood, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have for a person skilled in the art the description of these details also can understand the present invention completely.In addition, for fear of essence of the present invention is caused to unnecessary obscuring, do not describe well-known method, process, flow process, element and circuit etc. in detail.
Referring to Fig. 2, be depicted as the theory diagram of embodiment of the present invention three-phase photovoltaic broken network relay zero crossing control circuit, comprise inverter output current detection circuit 20, master control DSP circuit 30, relay drive circuit 40 and relay circuit 10, inverter output current detection circuit 20 is for detection of the output current IA of inverter side circuit, the proportional current signal IA ' of output current of output one and inverter side circuit; Master control DSP circuit is for receiving and the proportional current signal IA ' of output current of inverter side circuit, detect the zero crossing to the proportional current signal IA ' of output current of inverter side circuit, and zero crossing is set to the first delay time t1, after the first delay time t1 arrives, outputs level signals RLY1; Relay drive circuit is for converting level signal RLY1 to switch controlling signal, and control relay drives signal JDK1 to be switched on or switched off relay circuit 10 coils; Relay circuit 10 is for being switched on or switched off access or the disconnection of control inverter lateral circuit 50 and grid side circuit 60 by it.
Pass through the present embodiment, inverter side circuit is connected with grid side circuit by relay circuit, set a delay time when the output current zero crossing proportional to inverter side output current detecting by master control DSP circuit, after delay time arrives, a level signal of output is removed control relay, can ensure relay closed or disconnection in the time of next output current zero crossing, avoid relay closed or arcing phenomenon of producing while disconnecting in the time having electric current, make relay contact oxidation impaired, can ensure the safe handling of relay circuit.
Particularly, describe the implementation process of embodiment of the present invention photovoltaic broken network relay zero crossing control circuit in detail below in conjunction with Fig. 3 to Fig. 6.
Referring to Fig. 3, be depicted as the theory diagram of inverter output current detection circuit in embodiment of the present invention photovoltaic broken network relay zero crossing control circuit, inverter current testing circuit 20 comprises Hall current sensor 21, for extracting the output current I of described inverter side circuit
a, and export one to the proportional voltage signal V of output current of described inverter side circuit
a; Bleeder circuit 22, for carrying out dividing potential drop V to described voltage signal
a, output branch pressure voltage signal V
a'; Homophase follow circuit 23, for to described branch pressure voltage signal V
a' carry out that homophase is followed and impedance matching, the proportional current signal I of output current of output and inverter side circuit
a'.
The concrete application example of inverter output current detection circuit 20 is referring to Fig. 4, and U3 is the Hall current sensor of PCB plug-in mounting, I
a_INand I
a_OUTbe the cabling of inverter side circuit on pcb board, 1 pin of U3,2 pin, 3 pin are the power supply signals that connect positive and negative 15V, 4 pin output voltage signal V proportional to inverter output current
a, after resistance R 2, the step-down of R27 dividing potential drop, output branch pressure voltage signal V
a', branch pressure voltage signal V
a' homophase of following amplifier U2-A through homophase again follows, and carries out after impedance matching the proportional current signal I of output current of output and inverter side circuit
a'.
Through the proportional current signal I of inverter output current detection circuit 20 output current that export and inverter side circuit
a' inputing to master control DSP circuit 30, the specific works process of master control DSP circuit 30 is: judge whether to want conducting or turn-off relay; When needing conducting or turn-offing relay, detect the proportional current signal I of output current to inverter side circuit
a' zero crossing; Detect after inverter output current zero crossing, set the first delay time t1, after the first delay time t1 arrives, outputs level signals RLY1.Because master control DSP outputs level signals RLY1 converts relay contact to, action has the second delay time t2, therefore t1+t2 is arranged to the half period time of inverter side circuit output current signal, can ensure that relay circuit opens or turn-off in the time of next current zero-crossing point, thereby making relay is to be switched on or switched off for 1 o'clock at electric current, avoid arcing phenomenon, contact also can not be oxidized and adhesion, improves fail safe.
The level signal RLY1 that master control DSP circuit 30 is exported exports relay drive circuit 40 to and processes, relay drive circuit 40 further comprises: optocoupler 41, fly-wheel diode circuit 42, pressure limiting circuit 43 and switching circuit 44, optocoupler 41 has former limit 411 and secondary 412, and former limit 411 1 inputs receive the first power supply voltage signal V
cC1, another input receives described level signal RLY1, and secondary 412 is inputted termination second source voltage signal V
cC2, secondary 412 is exported termination switching circuit 44 control ends, and for converting level signal RLY1 to switch controlling signal, control relay drives signal JDK1 to be switched on or switched off relay circuit 10; Second source voltage signal V described in fly-wheel diode circuit 42 1 input terminations
cC2, the other end is connected with relay circuit 10, for absorbing the induced voltage producing when relay circuit 10 coils are switched to disconnection; Pressure limiting circuit 43 one end are connected with fly-wheel diode circuit 42 outputs, and one end of other end connecting valve circuit 44, for limiting the voltage of relay circuit 10 coils; The other end ground connection of switching circuit 44, by the conducting of switching circuit 44 and being switched on or switched off of shutoff control relay circuit 10.
The concrete application example of relay drive circuit 40 is referring to Fig. 6, and RLY1 is the level signal from master control DSP circuit 30, and level signal RLY1 converts by optocoupler 41 connection or the disconnection that switch controlling signal can control relay circuit 10 to.The first input supply voltage V
cC1the 5V voltage of input is inputted 411 one end, former limit of optocoupler 41 by resistance R 3, the other end on the level signal RLY1 input former limit 411 of optocoupler 41, when RLY1 is while being low, the former limit 411 of optocoupler 41 has electric current to flow through and conducting, secondary 412 conductings of optocoupler 41, second source voltage V
cC2the 12V voltage of input is controlled the metal-oxide-semiconductor field effect t MOSFET Q2 conducting as switching circuit 44 through resistance R 6, and relay drive signal JDK1 must conduct relay circuit 10.Resistance R 8, R9, R10 and capacitor C 4 are arranged in parallel composition pressure limiting circuit 43 and limit the voltage of relay circuit 10 coils, and in the time that relay circuit 10 must conduct, capacitor C 4 is equivalent to open circuit, second source voltage V
cC2can load completely on the coil of relay circuit 10, when after relay circuit 10 conductings, resistance R 8, R9, above R10, have 3V voltage drop, make relay circuit 10 coils keep voltages to only have 9V, make like this relay circuit 10 minimizing of generating heat in the time of conducting.When RLY1 signal is while being high, the former limit 411 of optocoupler 41 is obstructed, and secondary 412 disconnects and makes also can disconnect as the MOSFET Q2 of switching circuit 44, and relay drive signal JDK2 cannot be carried in relay circuit 10 coil two ends, and relay circuit 10 also can turn-off.Fly-wheel diode circuit 42 is composed in parallel by diode D1 and D2; and be arranged in parallel with relay circuit 10 coils; relay circuit 10 coils are inductive loads; MOSFET Q2 is by being conducting to when cut-off; coil two ends can produce higher induced voltage; anti-paralleled diode D1, D2 will absorb induced voltage, protection MOSFET Q2, thus ensure the reliability in circuit working process.
The photovoltaic broken network relay zero crossing control circuit that the embodiment of the present invention provides can be applicable to three-phase or single-phase photovoltaic DC-to-AC converter circuit, those skilled in the art are appreciated that simultaneously, also can be applicable to the inverter circuit of other types, the present invention is not restricted the concrete application of the photovoltaic broken network relay zero crossing control circuit providing.
Flow chart shown in Figure 7, the embodiment of the present invention also provides the three-phase photovoltaic broken network relay zero crossing control method corresponding with three-phase photovoltaic broken network relay zero crossing control circuit, comprises the following steps:
S10, detects the output current of inverter side circuit, the proportional current signal of output current of output one and inverter side circuit;
S20, receives and the proportional current signal of inverter side circuit output current, and detect and the zero crossing of the proportional current signal of inverter side circuit output current, and zero crossing is set to a delay time, after delay time arrival, outputs level signals;
S30, converts level signal to switch controlling signal, and control relay drives signal to be switched on or switched off relay circuit;
S40, by the conducting of control relay circuit or access or the disconnection of disconnection control inverter lateral circuit and grid side circuit.
Pass through the present embodiment, set the first delay time when being controlled at the output current zero crossing proportional to inverter side output current detecting, can ensure relay closed or disconnection in the time of next output current zero crossing, avoid relay closed or disconnection generation arcing phenomenon in the time having electric current, make relay contact oxidation impaired, ensure the safe handling of relay circuit.
The photovoltaic broken network relay zero crossing control method that the embodiment of the present invention provides can be applicable to three-phase or the control of single-phase photovoltaic DC-to-AC converter circuit, those skilled in the art are appreciated that simultaneously, also can be applicable to the inverter circuit control of other types, the present invention is not restricted the concrete application of the photovoltaic broken network relay zero crossing control method providing.
Further, the output current of detection inverter side circuit is specially:
S101, extracts the output current of inverter side circuit, and export one to the proportional voltage signal of output current of inverter side circuit;
S102, carries out dividing potential drop to voltage signal, output branch pressure voltage signal;
S103, carries out to branch pressure voltage signal that homophase is followed and impedance matching, the proportional current signal of output current of output one and inverter side circuit.
Receive described and the proportional current signal of inverter side circuit output current, detect zero crossing described and the proportional current signal of inverter side circuit output current, and described zero crossing is set to a delay time, after delay time arrives, outputs level signals is specially:
S201, receives and the proportional current signal of inverter side circuit output current;
S201, judges whether to want conducting or turn-offs relay;
S202, when needing conducting or turn-offing relay, detects output current zero crossing proportional to inverter side circuit output current;
S203, detects after inverter output current zero crossing, sets the first delay time, after the first delay time reaches, and outputs level signals.
Further, exporting the described level signal delay time that extremely described relay circuit is switched on or switched off is the second delay time, the first delay time and described the second delay time sum are arranged to the half period time of inverter side circuit output current signal, can ensure that relay circuit opens or turn-off in the time of next current zero-crossing point, thereby making relay is to be switched on or switched off for 1 o'clock at electric current, avoid arcing phenomenon, contact also can not be oxidized and adhesion, improves fail safe.
Referring to Fig. 8, be depicted as embodiment of the present invention three-phase photovoltaic broken network relay zero crossing control system structural representation, relay is as the switching device of inverter access electrical network, its reliability design is extremely important, therefore, adopt two group relay groups to be connected control to inverter side circuit with grid side circuit, each self-contained four relays of every group relay group are controlled three-phase output and center line four road signals respectively, two relay series connection corresponding in the signal of every road arrange, described each relay adopts a photovoltaic broken network relay zero crossing control circuit independently providing as the embodiment of the present invention to control.Concrete K1, K3, K5, K7 are one group as shown in Figure 8, and K2, K4, K6, K8 are one group, and two group relay controls can ensure when out of order in a group relay time, and a normal group relay can ensure that inverter and electrical network disconnect in addition.K1 is connected inverter side L1 and grid side AC_L1 with after K2 series connection, K3 is connected inverter side L2 and grid side AC_L2 with after K4 series connection, K5 is connected inverter side L3 and grid side AC_L3 with after K6 series connection, K7 and K8 are connected in series inverter side center line N and grid side center line AC_N, JDK1-JDK8 is respectively the driving signal of 8 relays, JDK1 control relay K1, JDK2 control relay K2, JDK3 control relay K3, JDK4 control relay K4, JDK5 control relay K5, JDK6 control relay K6, JDK7 control relay K7, JDK8 control relay K8, each relay adopts independently control signal, can ensure that each relay contact can be in the action of the moment of inverter output current zero passage, avoid relay contact oxidation or adhesion, improve the fail safe of control system.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
Above a kind of three-phase photovoltaic broken network relay zero crossing control circuit provided by the present invention, method and system are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. a photovoltaic broken network relay zero crossing control circuit, for access or the disconnection of control inverter lateral circuit and grid side circuit, it is characterized in that, comprise inverter output current detection circuit, master control Digital Signal Processing DSP circuit, relay drive circuit and relay circuit
Described inverter output current detection circuit is for detection of the output current of described inverter side circuit, the proportional current signal of output current of output one and inverter side circuit;
Described master control Digital Signal Processing DSP circuit is for receiving the proportional current signal of output current described and inverter side circuit, detect the zero crossing of the proportional current signal of output current of described and inverter side circuit, and described zero crossing is set to the first delay time, after described the first delay time arrives, outputs level signals, wherein, exporting the described level signal delay time that extremely described relay circuit is switched on or switched off is the second delay time, described the first delay time and described the second delay time sum are arranged to the half period time of inverter side circuit output current signal,
Described relay drive circuit is for converting described level signal to switch controlling signal, and control relay drives signal to be switched on or switched off described relay circuit;
Described relay circuit is for being switched on or switched off access or the disconnection of control inverter lateral circuit and grid side circuit by it.
2. photovoltaic broken network relay zero crossing control circuit according to claim 1, is characterized in that, described inverter output current detection circuit further comprises:
Hall current sensor, for extracting the output current of described inverter side circuit, and export one to the proportional voltage signal of output current of described inverter side circuit;
Bleeder circuit, for described voltage signal is carried out to dividing potential drop, output branch pressure voltage signal;
Homophase follow circuit, for described branch pressure voltage signal is carried out, homophase is followed and impedance matching, output one and the proportional current signal of output current of described inverter side circuit.
3. photovoltaic broken network relay zero crossing control circuit according to claim 1, is characterized in that, the specific works process of described master control Digital Signal Processing DSP circuit is:
Receive described output current signal;
Judge whether to want conducting or turn-off relay;
When needing conducting or turn-offing relay, detect described output current zero crossing;
Described zero crossing is set to a delay time, after delay time arrives, outputs level signals.
4. photovoltaic broken network relay zero crossing control circuit according to claim 1, is characterized in that, described relay drive circuit further comprises: optocoupler, fly-wheel diode circuit, pressure limiting circuit and switching circuit,
Described optocoupler has former limit and secondary, and described former limit one input receives the first power supply voltage signal, and another input receives described level signal,
Described secondary input termination second source voltage signal, switching circuit control end described in described secondary output termination, for converting described level signal to switch controlling signal, control relay drives signal to be switched on or switched off described relay circuit;
Second source voltage signal described in described fly-wheel diode circuit one termination, the other end is connected with relay circuit, for absorbing the induced voltage producing when described relay circuit coil is switched to disconnection;
Described pressure limiting circuit one end is connected with described fly-wheel diode circuit output end, and the other end connects one end of described switching circuit, for limiting the voltage of described relay circuit coil;
The other end ground connection of described switching circuit, controls being switched on or switched off of described relay circuit for the conducting by described switching circuit and shutoff.
5. a photovoltaic broken network relay zero crossing control method, for by access or the disconnection of relay circuit control inverter lateral circuit and grid side circuit, is characterized in that, comprises the following steps:
Detect the output current of described inverter side circuit, output one and the proportional current signal of output current of inverter side circuit;
Receive described and the proportional current signal of inverter side circuit output current, detect zero crossing described and the proportional current signal of inverter side circuit output current, and described zero crossing is set to the first delay time, after described the first delay time arrives, outputs level signals, wherein, exporting the delay time that described level signal to relay circuit is switched on or switched off is the second delay time, described the first delay time and described the second delay time sum is arranged to the half period time of inverter side circuit output current signal;
Convert described level signal to switch controlling signal, control relay drives signal to be switched on or switched off described relay circuit;
Be used for by the access or the disconnection that are switched on or switched off control inverter lateral circuit and grid side circuit of relay circuit.
6. photovoltaic broken network relay zero crossing control method according to claim 5, is characterized in that, detects the output current of described inverter side circuit, and output one is specially to the proportional current signal of output current of inverter side circuit:
Extract the output current of described inverter side circuit, and export one to the proportional voltage signal of output current of described inverter side circuit;
Described voltage signal is carried out to dividing potential drop, output branch pressure voltage signal;
Described branch pressure voltage signal is carried out to homophase is followed and impedance matching, the proportional current signal of output current of output one and described inverter side circuit.
7. photovoltaic broken network relay zero crossing control method according to claim 5, it is characterized in that, receive described and the proportional current signal of inverter side circuit output current, detect zero crossing described and the proportional current signal of inverter side circuit output current, and described zero crossing is set to a delay time, after delay time arrives, outputs level signals is specially:
Receive described and the proportional current signal of inverter side circuit output current;
Judge whether to want conducting or turn-off relay;
When needing conducting or turn-offing relay, detect zero crossing described and the proportional current signal of inverter side circuit output current;
Described zero crossing is set to a delay time, after delay time arrives, outputs level signals.
8. a three-phase photovoltaic broken network relay zero crossing control system, inverter side circuit is exported with a center line and is connected with grid side circuit by three-phase, it is characterized in that,
Adopt two group relay groups to be connected control to described inverter side circuit with described grid side circuit, each self-contained four relays of every group relay group are controlled three-phase output and center line four road signals respectively, two relays series connection corresponding in the signal of every road arrange, described each relay adopt one independently the photovoltaic broken network relay zero crossing control circuit as described in claim 1-4 any one control.
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| CN100413174C (en) * | 2006-03-02 | 2008-08-20 | 华中科技大学 | Method and apparatus for carrying out combining-net using voltage control type inverter |
| CN101587785A (en) * | 2008-05-23 | 2009-11-25 | 沈阳市睿宝电子有限公司 | Diode arc extinguishing alternating-current switch |
| CN101577192B (en) * | 2009-06-12 | 2011-05-04 | 百利通电子(上海)有限公司 | Method of zero passage switch of electromagnetic relay and circuit |
| CN101908439B (en) * | 2010-07-09 | 2012-09-12 | 北海市深蓝科技发展有限责任公司 | Self-adaptive electromagnetic relay zero-crossing on and off control method |
| CN202268709U (en) * | 2011-09-30 | 2012-06-06 | 深圳市英威腾电气股份有限公司 | Photovoltaic broken network relay zero crossing control circuit and system |
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2011
- 2011-09-30 CN CN201110297724.3A patent/CN102510081B/en active Active
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Effective date of registration: 20180115 Address after: 518055 Guangdong city of Shenzhen province Nanshan District Taoyuan streets Beihuan Industrial Zone in the high mountain cat No. 7 Building 5 layer 504 Patentee after: Shenzhen yingweiteng Photovoltaic Technology Co. Ltd. Address before: 518055 Nanshan District, Shenzhen Province, Longjing high tech Industrial Park, No. 4 plant on the ground floor, No. Patentee before: Shenzhen Yingweiteng Electric Co., Ltd. |
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