CN107748292A - One kind exchange insulation detecting circuit, system and method - Google Patents
One kind exchange insulation detecting circuit, system and method Download PDFInfo
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- CN107748292A CN107748292A CN201711267345.3A CN201711267345A CN107748292A CN 107748292 A CN107748292 A CN 107748292A CN 201711267345 A CN201711267345 A CN 201711267345A CN 107748292 A CN107748292 A CN 107748292A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Abstract
The present invention provides a kind of exchange insulation detecting circuit, system and method, exchange insulation detecting circuit therein is connected between power network and ground by rectifier bridge, current-limiting resistance, gate-controlled switch and switch power module, current-limiting resistance is formed bleeder circuit with AC network ground insulation resistance, realize the calculating of AC network ground insulation resistance；Meanwhile the three-phase virtual impedance unit realized in the prior art using resistance with rectifier bridge replacement, avoid the problem of system is lost greatly with radiating is needed certainly in the prior art.
Description
Technical field
The present invention relates to photovoltaic generation control technology field, more particularly to a kind of exchange insulation detecting circuit, system and side
Method.
Background technology
To ensure the reliability service of high power three-phase isolating transformer and photovoltaic plant, a kind of light in the prior art be present
Photovoltaic generating system and its grid side insulation resistance detection device, it uses resistance and inductance to realize three-phase virtual impedance unit, should
Three phase of impedance in three-phase virtual impedance unit can produce with the equipotential virtual zero line of actual zero line, and then coordinate control single
Member is calculated, and realizes that grid side insulation impedance detects.
But in order to improve the power density of inverter and system generating efficiency, photovoltaic side DC input voitage from
1000V brings up to 1500V, and inverter ac side voltage is also constantly lifted from 400V, and maximum can bring up to 800V.And work of resistance
Rate and voltage it is square directly proportional, with the increase of voltage, system is multiplied from being lost, and needs to radiate, and influences device
Life-span.
Therefore, three-phase virtual impedance unit is realized to detect the scheme of line insulation impedance by resistance in the prior art
No longer it is applicable.
The content of the invention
It is of the invention that a kind of exchange insulation detecting circuit, system and method are provided, it is lost certainly with solving system in the prior art
The problem of greatly and needing radiating.
To achieve the above object, the technical scheme that the application provides is as follows：
One kind exchange insulation detecting circuit, including：Rectifier bridge, current-limiting resistance, gate-controlled switch and switch power module；Its
In：
The current-limiting resistance and the gate-controlled switch are connected in series in the input of the rectifier bridge and the Switching Power Supply
Between the hot end of module；
The output end of the rectifier bridge is connected with power network；
The cold end ground connection of the switch power module.
Preferably, when the power network is single-phase power network, the rectifier bridge is diode；The anode of the diode is institute
The input of rectifier bridge is stated, the negative electrode of the diode is the output end of the rectifier bridge.
Preferably, when the power network is three phase network, the rectifier bridge includes：Two diodes in parallel；
The anode of two diodes is connected, and tie point is the input of the rectifier bridge；
The negative electrode of two diodes is the output end of the rectifier bridge, respectively with any two-phase of the power network one by one
It is corresponding to be connected；
Or the rectifier bridge includes：Three diodes in parallel；
The anode of three diodes is connected, and tie point is the input of the rectifier bridge；
The negative electrode of three diodes is the output end of the rectifier bridge, and the three-phase with the power network corresponds respectively
It is connected.
Preferably, the switch power module is：BUCK topologys, BOOST are topological, BUCK-BOOST is topological, CUK is topological,
Any one in forward topology, flyback topologies, half-bridge topology, full-bridge topology and push-pull topology.
One kind exchange Insulation Inspection System, including：Voltage sample module, control unit and any described friendship as described above
Flow insulation detecting circuit；Wherein：
The input of the voltage sample module is connected with the power network；
The output end of the voltage sample module is connected with the input of described control unit；
The output end of described control unit is connected with the control terminal for exchanging gate-controlled switch in insulation detecting circuit；
Described control unit is used for：Control the gate-controlled switch to disconnect, detect what is obtained according to the voltage sample module
Power network phase voltage calculation obtains phase voltage peak value；Control the gate-controlled switch to close, detected according to the voltage sample module
To power network phase voltage calculation obtain phase voltage average value over the ground；AC network insulation against ground resistance is calculated according to Ohm's law
It is anti-；Judge whether the AC network ground insulation resistance is less than default impedance reference, if the AC network insulation against ground hinders
Resist and be less than the default impedance reference, then output alarm signal.
Preferably, when the power network is three phase network, described control unit detects according to the voltage sample module
To power network phase voltage calculation obtain phase voltage peak value, used formula is：
Ua=Ub=Uc=Umsin ω t；
Wherein, Ua, Ub, Uc are respectively the power network phase voltage of three-phase, and Um is the phase voltage peak value, and ω is angular frequency
Rate, t are the time.
Preferably, when the power network is three phase network, alternating current is calculated according to Ohm's law in described control unit
Net ground insulation resistance, used formula are：
Wherein, UZFor power network voltage-to-ground, U1 is the output voltage of switch power module, UEFor the input of the rectifier bridge
Center line N DC component is held, andRZFor the AC network ground insulation resistance, R1 is current-limiting resistance
Resistance.
Preferably, in addition to：Data acquisition unit, the input of the data acquisition unit is connected with each inverter, described
The output end of data acquisition unit is connected with the input of described control unit；
The output end of described control unit also with the control terminal phase for exchanging switch power module in insulation detecting circuit
Even；
Described control unit is additionally operable to the information obtained according to the data acquisition unit, adjusts the switch power module
Output, to reduce the PID effects of photovoltaic battery panel.
One kind exchange insulation detecting method, applied to the control unit in exchange Insulation Inspection System, the exchange insulation
Detecting system also includes：Voltage sample module and as described above any described exchange insulation detecting circuit；Wherein, the voltage
The input of sampling module is connected with the power network；The output end of the voltage sample module and the input of described control unit
It is connected；The output end of described control unit is connected with the control terminal for exchanging gate-controlled switch in insulation detecting circuit；
The exchange insulation detecting method includes：
The gate-controlled switch is controlled to disconnect；
Phase voltage peak value is obtained according to the power network phase voltage calculation that the voltage sample module detects to obtain；
The gate-controlled switch is controlled to close；
The power network phase voltage calculation for detecting to obtain according to the voltage sample module obtains phase voltage average value over the ground；
AC network ground insulation resistance is calculated according to Ohm's law；
Judge whether the AC network ground insulation resistance is less than default impedance reference；
If the AC network ground insulation resistance is less than the default impedance reference, output alarm signal.
Preferably, when the power network is three phase network, the power network for detecting to obtain according to the voltage sample module
Phase voltage calculation obtains phase voltage peak value, including：
Power network phase voltage Ua, Ub or Uc for any one phase for detecting to obtain according to the voltage sample module, pass through public affairs
Formula Ua=Ub=Uc=Umsin ω t, the phase voltage peak value Um is calculated；
Wherein, ω is angular frequency, and t is the time.
Preferably, when the power network is three phase network, described according to Ohm's law AC network to be calculated exhausted over the ground
Edge impedance, including：
According to Ohm's law, pass through formulaThe AC network ground insulation resistance is calculated；
Wherein, UZFor power network voltage-to-ground, U1 is the output voltage of switch power module, UEFor the input of the rectifier bridge
Center line N DC component is held, andRZFor the AC network ground insulation resistance, R1 is current-limiting resistance
Resistance.
Exchange insulation detecting circuit provided by the invention, by rectifier bridge, current-limiting resistance, gate-controlled switch and Switching Power Supply mould
Block is connected between power network and ground, current-limiting resistance is formed bleeder circuit with AC network ground insulation resistance, is realized alternating current
The calculating of net ground insulation resistance；Meanwhile the three-phase virtual impedance for replacing being realized using resistance in the prior art with rectifier bridge
Unit, avoid the problem of system is lost greatly with radiating is needed certainly in the prior art.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly or in prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, the accompanying drawing in description is only this below
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of exchange Insulation Inspection System provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of single phase ac insulation detecting circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of equivalent circuit diagram of three-phase alternating current insulation detecting circuit provided in an embodiment of the present invention；
Fig. 4 is the equivalent circuit diagram of another three-phase alternating current insulation detecting circuit provided in an embodiment of the present invention；
Fig. 5 is rectified waveform schematic diagram of the A points with respect to center line N provided in an embodiment of the present invention；
Fig. 6 is another equivalent circuit diagram of three-phase alternating current insulation detecting circuit provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of three-phase alternating current insulation detecting method provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of the application protection.
A kind of exchange insulation detecting circuit of present invention offer, with solution, system greatly and needs to radiate from loss in the prior art
The problem of.
Specifically, referring to Fig. 1, the exchange insulation detecting circuit, including：Rectifier bridge 101, current-limiting resistance R1, gate-controlled switch
K1 and switch power module 102；Wherein：
Current-limiting resistance R1 and gate-controlled switch K1 is connected in series in the input and switch power module 102 of rectifier bridge 101
Between hot end；
The output end of rectifier bridge 101 is connected with power network；
The cold end ground connection of switch power module 102.
In specific practical application, the order of connection of current-limiting resistance R1 and gate-controlled switch K1 series connection is not limited to Fig. 1
Shown form, Fig. 1 are only a kind of example, can be depending on its concrete application environment, in the protection domain of the application.
And Fig. 1 is shown by taking three phase network as an example, when power network is single-phase power network, rectifier bridge 101 is a diode
, as shown in Fig. 2 the output end that the anode of the diode is the input of rectifier bridge 101, negative electrode is rectifier bridge 101.
When power network is three phase network, rectifier bridge 101 can be the form shown in Fig. 1, including：Three two poles in parallel
Pipe；And the anode of these three diodes is connected, tie point is the input of rectifier bridge 101；The negative electrode of these three diodes is whole
The output end of bridge 101 is flowed, corresponds be connected with the three-phase of power network respectively.
Or when power network is three phase network, rectifier bridge 101 can be the form shown in Fig. 3, including：Two parallel connections
Diode；And the anode of the two diodes is connected, tie point is the input of rectifier bridge 101；The moon of the two diodes
The extremely output end of rectifier bridge 101, correspond be connected with any two-phase of power network respectively；
Illustrated below by taking Fig. 1 as an example, Ra, Rb, Rc be three-phase alternating current power network per phase earth impedance, RZTo want meter
Obtained AC network ground insulation resistance, namely the equiva lent impedance over the ground of three-phase alternating current power network, its value be Ra, Rb, Rc simultaneously
Connection gained；Current-limiting resistance R1 resistance be, it is known that and its not only current limiting effect, but also participate in the calculating of electric network impedance,
Therefore this current-limiting resistance R1 answers the higher resistance of choice accuracy.Gate-controlled switch K1 can be contactor, relay or semiconductor
Controllable component, is not specifically limited herein, depending on its application environment, in the protection domain of the application.Switching Power Supply
The output voltage of module 102 is U1, and its amplitude size is controllable.
It is the equivalent circuit diagram that insulation detecting circuit is exchanged shown in Fig. 1 referring to Fig. 4, it is mutually electric according to the power network of any one phase
Ua, Ub or Uc are pressed, by Ua=Ub=Uc=Umsin ω t, phase voltage peak value Um can be calculated；Wherein, ω is angular frequency
Rate, t are the time.
Fig. 5 show rectified waveform of the A points with respect to center line N in Fig. 1 and Fig. 4, in view of DC component is only considered in the application,
Therefore after this waveform removes AC compounent, it is U to obtain DC componentE, its approximate value is：
In addition, as shown in Figure 4, power network phase voltage Ua, Ub of three-phase and Uc DC component are zero, therefore can not be considered
It is as shown in Figure 6 further to simplify isoboles to influence topological shown in Fig. 4 for three-phase power grid voltage.Herein, can according to Ohm's law
To draw：Wherein, UZFor power network voltage-to-ground, its value is equal to the average value of power network phase voltage.
In specific detection process, due to needing to know power network phase voltage Ua, Ub or Uc, if switch power module
102 are directly connected in circuit, then can influence the waveform of power network phase voltage Ua, Ub, Uc voltage-to-ground, therefore should first disconnect controllable
K1 is switched, detects power network phase voltage Ua, Ub or Uc；Afterwards close gate-controlled switch K1, further according to power network phase voltage Ua, Ub,
Uc detected value obtains its average value UZ.Then, in power network voltage-to-ground UZ, switch power module 102 output voltage U1, whole
Flow the input center line N of bridge 101 DC component UE, current-limiting resistance R1 resistance R1 it is known in the case of, according to above-mentioned
Ohm's law calculation formula can try to achieve AC network ground insulation resistance RZ。
The present embodiment provide the exchange insulation detecting circuit, by rectifier bridge 101, current-limiting resistance R1, gate-controlled switch K1 with
And switch power module 102 is connected between power network and ground, current-limiting resistance R1 is formed with AC network ground insulation resistance and divide
Volt circuit, realize the calculating of AC network ground insulation resistance；Meanwhile replaced in the prior art so that small rectifier bridge 101 is lost
The three-phase virtual impedance unit realized using resistance, the system in the prior art that avoids are asked greatly from loss with what needs radiated
Topic.
What deserves to be explained is switch power module 102 can be：BUCK topologys, BOOST are topological, BUCK-BOOST is topological,
Any one in CUK topologys, forward topology, flyback topologies, half-bridge topology, full-bridge topology and push-pull topology, does not do and has herein
Body limits, depending on its concrete application environment, in the protection domain of the application.
Another embodiment of the present invention additionally provides a kind of exchange Insulation Inspection System, referring to Fig. 1, including：Voltage sample mould
Block 104, control unit 103 and exchange insulation detecting circuit；Wherein：
The input of voltage sample module 104 is connected with power network；
The output end of voltage sample module 104 is connected with the input of control unit 103；
The output end of control unit 103 is connected with exchanging the control terminal of gate-controlled switch K1 in insulation detecting circuit；
Control unit 103 is used for：Control gate-controlled switch K1 to disconnect, obtained power network is detected according to voltage sample module 104
Phase voltage calculation obtains phase voltage peak value；Gate-controlled switch K1 closures are controlled, obtained power network is detected according to voltage sample module 104
Phase voltage calculation obtains phase voltage average value over the ground；AC network ground insulation resistance is calculated according to Ohm's law；Judge
Whether AC network ground insulation resistance is less than default impedance reference, if AC network ground insulation resistance is less than default impedance base
Standard, then output alarm signal.
Also, the exchange insulation detecting circuit, including：Rectifier bridge 101, current-limiting resistance R1, gate-controlled switch K1 and switch
Power module 102；Wherein：
Current-limiting resistance R1 and gate-controlled switch K1 is connected in series in the input and switch power module 102 of rectifier bridge 101
Between hot end；
The output end of rectifier bridge 101 is connected with power network；
The cold end ground connection of switch power module 102.
In specific practical application, the order of connection of current-limiting resistance R1 and gate-controlled switch K1 series connection is not limited to Fig. 1
Shown form, Fig. 1 are only a kind of example, can be depending on its concrete application environment, in the protection domain of the application.
In addition, when power network is single-phase power network, rectifier bridge 101 is a diode, as shown in Fig. 2 the diode
Anode be the input of rectifier bridge 101, the output end that negative electrode is rectifier bridge 101.When power network is three phase network, rectifier bridge
101 can be the form shown in Fig. 1, including：Three diodes in parallel；And the anode of these three diodes is connected, connection
Point is the input of rectifier bridge 101；The negative electrode of these three diodes be rectifier bridge 101 output end, respectively with the three-phase of power network
Correspond and be connected.Or when power network is three phase network, rectifier bridge 101 can be the form shown in Fig. 3, including：Two
Diode in parallel；And the anode of the two diodes is connected, tie point is the input of rectifier bridge 101；The two diodes
Negative electrode be rectifier bridge 101 output end, correspond be connected with any two-phase of power network respectively；
Optionally, switch power module 102 can be：BUCK topologys, BOOST topologys, BUCK-BOOST topologys, CUK are opened up
Flutter, any one in forward topology, flyback topologies, half-bridge topology, full-bridge topology and push-pull topology, do not do specific limit herein
It is fixed, depending on its concrete application environment, in the protection domain of the application.
Preferably, when power network is three phase network, control unit 103 detects obtained electricity according to voltage sample module 104
Net phase voltage calculation obtains phase voltage peak value, and used formula is：
Ua=Ub=Uc=Umsin ω t；
Wherein, Ua, Ub, Uc are respectively the power network phase voltage of three-phase, and Um is phase voltage peak value, and ω is angular frequency, when t is
Between.
Preferably, when power network is three phase network, AC network is calculated over the ground according to Ohm's law in control unit 103
Insulation impedance, used formula are：
Wherein, UZFor power network voltage-to-ground, equal to the average value of power network phase voltage, U1 is the defeated of switch power module 102
Go out voltage, UEFor the input center line N of rectifier bridge 101 DC component, andRZFor AC network over the ground
Insulation impedance, R1 are current-limiting resistance R1 resistance.
According to the analysis of above-described embodiment, it is known that needing to obtain power network phase voltage Ua, Ub or Uc in calculating process
Detected value, this just needs voltage sample module 104 to realize；And due to needing control gate-controlled switch K1 conducting and shut-off,
Come realize conducting before and after power network phase voltage Ua, Ub or Uc detection, so needing the corresponding control of control unit 103；In addition,
Corresponding calculating process in above-described embodiment, it can also be realized by control unit 103.Also, when control unit 103 calculates
The AC network ground insulation resistance R arrivedZLess than built-in default impedance reference RTWhen, it should be alarmed.
The control unit 103 can be master controller or single controller in system, not do herein specific
Limit, can be depending on its concrete application environment, in the protection domain of the application.
Specific operation principle is same as the previously described embodiments, no longer repeats one by one herein.
Preferably, also include referring to Fig. 1, the exchange Insulation Inspection System：Data acquisition unit 105, data acquisition unit 105
Input is connected with each inverter, and the output end of data acquisition unit 105 is connected with the input of control unit 103；
The output end of control unit 103 is also connected with exchanging the control terminal of switch power module 102 in insulation detecting circuit；
Control unit 103 is additionally operable to the information obtained according to data acquisition unit 105, adjusting switch power module 102 it is defeated
Go out, to reduce the PID effects of photovoltaic battery panel.
Voltage sample module 104 and gate-controlled switch K1 coordinate control unit 103 to realize AC network ground insulation resistance
Detection and calculating；Meanwhile the information of each photovoltaic DC-to-AC converter of acquisition is transmitted to control unit 103, made by data acquisition unit 105
Control unit 103 can according to be transmitted through come information adjusting switch power module 102 output, so as to reduce photovoltaic battery panel
PID effects.
Another embodiment of the present invention additionally provides a kind of exchange insulation detecting method, exhausted applied to being exchanged in above-described embodiment
The control unit 103 of edge detecting system, the structure and principle of the exchange Insulation Inspection System are same as the previously described embodiments, herein
No longer repeat one by one.
Referring to Fig. 7, the exchange insulation detecting method includes：
S101, control gate-controlled switch disconnect；
S102, the power network phase voltage calculation for detecting to obtain according to voltage sample module obtain phase voltage peak value；
S103, control gate-controlled switch closure；
S104, the power network phase voltage calculation for detecting to obtain according to voltage sample module obtain phase voltage average value over the ground；
S105, AC network ground insulation resistance is calculated according to Ohm's law；
S106, judge whether AC network ground insulation resistance is less than default impedance reference；
If AC network ground insulation resistance is less than default impedance reference, step S107 is performed；
S107, output alarm signal.
Preferably, when power network is three phase network, step S102, including：
Power network phase voltage Ua, Ub or Uc of obtained any one phase are detected according to voltage sample module 104, passes through formula
Ua=Ub=Uc=Umsin ω t, phase voltage peak value Um is calculated；
Wherein, ω is angular frequency, and t is the time.
Preferably, when power network is three phase network, step S105 includes：
According to Ohm's law, pass through formulaAC network ground insulation resistance is calculated；
Wherein, UZFor power network voltage-to-ground, U1 is the output voltage of switch power module 102, UEFor the defeated of rectifier bridge 101
Enter to hold center line N DC component, andRZFor AC network ground insulation resistance, R1 is current-limiting resistance R1's
Resistance.
Specific principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described by the way of progressive in the present invention, and what each embodiment stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical scheme makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent
Change and modification, still fall within technical solution of the present invention protection in the range of.
Claims (11)
1. one kind exchange insulation detecting circuit, it is characterised in that including：Rectifier bridge, current-limiting resistance, gate-controlled switch and switch electricity
Source module；Wherein：
The current-limiting resistance and the gate-controlled switch are connected in series in the input of the rectifier bridge and the switch power module
Hot end between；
The output end of the rectifier bridge is connected with power network；
The cold end ground connection of the switch power module.
2. exchange insulation detecting circuit according to claim 1, it is characterised in that when the power network is single-phase power network,
The rectifier bridge is diode；The anode of the diode is the input of the rectifier bridge, and the negative electrode of the diode is institute
State the output end of rectifier bridge.
3. exchange insulation detecting circuit according to claim 1, it is characterised in that when the power network is three phase network,
The rectifier bridge includes：Two diodes in parallel；
The anode of two diodes is connected, and tie point is the input of the rectifier bridge；
The negative electrode of two diodes is the output end of the rectifier bridge, and any two-phase with the power network corresponds respectively
It is connected；
Or the rectifier bridge includes：Three diodes in parallel；
The anode of three diodes is connected, and tie point is the input of the rectifier bridge；
The negative electrode of three diodes is the output end of the rectifier bridge, and the three-phase with the power network corresponds phase respectively
Even.
4. exchange insulation detecting circuit according to any one of claims 1 to 3, it is characterised in that the switch power module
For：BUCK topologys, BOOST topologys, BUCK-BOOST topologys, CUK topologys, forward topology, flyback topologies, half-bridge topology, full-bridge
Topology and push-pull topology in any one.
5. one kind exchange Insulation Inspection System, it is characterised in that including：Voltage sample module, control unit and as right will
Seek 1 to 4 any described exchange insulation detecting circuit；Wherein：
The input of the voltage sample module is connected with the power network；
The output end of the voltage sample module is connected with the input of described control unit；
The output end of described control unit is connected with the control terminal for exchanging gate-controlled switch in insulation detecting circuit；
Described control unit is used for：The gate-controlled switch is controlled to disconnect, the power network for detecting to obtain according to the voltage sample module
Phase voltage calculation obtains phase voltage peak value；Control the gate-controlled switch to close, detect what is obtained according to the voltage sample module
Power network phase voltage calculation obtains phase voltage average value over the ground；AC network ground insulation resistance is calculated according to Ohm's law；
Judge whether the AC network ground insulation resistance is less than default impedance reference, if the AC network ground insulation resistance is small
In the default impedance reference, then output alarm signal.
6. exchange Insulation Inspection System according to claim 5, it is characterised in that when the power network is three phase network,
The power network phase voltage calculation that described control unit detects to obtain according to the voltage sample module obtains phase voltage peak value, is used
Formula be：
Ua=Ub=Uc=Umsin ω t；
Wherein, Ua, Ub, Uc are respectively the power network phase voltage of three-phase, and Um is the phase voltage peak value, and ω is angular frequency, and t is
Time.
7. exchange Insulation Inspection System according to claim 5, it is characterised in that when the power network is three phase network,
AC network ground insulation resistance is calculated according to Ohm's law in described control unit, and used formula is：
<mrow>
<mfrac>
<msub>
<mi>U</mi>
<mi>Z</mi>
</msub>
<msub>
<mi>R</mi>
<mi>Z</mi>
</msub>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<mi>U</mi>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>U</mi>
<mi>E</mi>
</msub>
</mrow>
<mrow>
<mi>R</mi>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>R</mi>
<mi>Z</mi>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, UZFor power network voltage-to-ground, U1 is the output voltage of switch power module, UEFor the input pair of the rectifier bridge
Center line N DC component, andRZFor the AC network ground insulation resistance, R1 is the resistance of current-limiting resistance.
8. exchange Insulation Inspection System according to claim 5, it is characterised in that also include：Data acquisition unit, the number
It is connected according to the input of collector with each inverter, the output end of the data acquisition unit and the input of described control unit
It is connected；
The output end of described control unit is also connected with the control terminal for exchanging switch power module in insulation detecting circuit；
Described control unit is additionally operable to the information obtained according to the data acquisition unit, adjusts the defeated of the switch power module
Go out, to reduce the PID effects of photovoltaic battery panel.
9. one kind exchange insulation detecting method, it is characterised in that described applied to the control unit in exchange Insulation Inspection System
Exchange Insulation Inspection System also includes：Voltage sample module and the exchange Insulation monitoring electricity as described in Claims 1-4 is any
Road；Wherein, the input of the voltage sample module is connected with the power network；The output end of the voltage sample module with it is described
The input of control unit is connected；The output end of described control unit and the control for exchanging gate-controlled switch in insulation detecting circuit
End processed is connected；
The exchange insulation detecting method includes：
The gate-controlled switch is controlled to disconnect；
Phase voltage peak value is obtained according to the power network phase voltage calculation that the voltage sample module detects to obtain；
The gate-controlled switch is controlled to close；
The power network phase voltage calculation for detecting to obtain according to the voltage sample module obtains phase voltage average value over the ground；
AC network ground insulation resistance is calculated according to Ohm's law；
Judge whether the AC network ground insulation resistance is less than default impedance reference；
If the AC network ground insulation resistance is less than the default impedance reference, output alarm signal.
10. exchange insulation detecting method according to claim 9, it is characterised in that when the power network is three phase network,
The power network phase voltage calculation for detecting to obtain according to the voltage sample module obtains phase voltage peak value, including：
Power network phase voltage Ua, Ub or Uc for any one phase for detecting to obtain according to the voltage sample module, pass through formula Ua
=Ub=Uc=Umsin ω t, the phase voltage peak value Um is calculated；
Wherein, ω is angular frequency, and t is the time.
11. exchange insulation detecting method according to claim 9, it is characterised in that when the power network is three phase network,
It is described that AC network ground insulation resistance is calculated according to Ohm's law, including：
According to Ohm's law, pass through formulaThe AC network ground insulation resistance is calculated；
Wherein, UZFor power network voltage-to-ground, U1 is the output voltage of switch power module, UEFor the input pair of the rectifier bridge
Center line N DC component, andRZFor the AC network ground insulation resistance, R1 is the resistance of current-limiting resistance.
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