CN113687128A - Current detection method, device and equipment of photovoltaic PID suppression circuit - Google Patents
Current detection method, device and equipment of photovoltaic PID suppression circuit Download PDFInfo
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Abstract
The invention discloses a current detection method, a device and equipment of a photovoltaic PID suppression circuit, wherein the current detection method comprises the following steps: acquiring any one of a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground, or a third voltage of the third phase line to the ground; acquiring a fourth voltage of the PID direct-current power supply; acquiring a phase voltage of a phase line corresponding to the voltage to ground; and determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value. The current of the PID suppression circuit can be obtained without arranging a current sensor and other sampling circuits in the PID suppression circuit, and the complexity of the circuit is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of photovoltaic PID suppression circuits, in particular to a current detection method, a device and equipment of a photovoltaic PID suppression circuit.
Background
The damage of Potential Induced attenuation (PID) effect causes the power, fill factor, open-circuit voltage and short-circuit current of the photovoltaic panel to be rapidly reduced, thereby reducing the output power of the solar power station, reducing the power generation amount and reducing the benefit of the solar power station.
The reason for the PID effect is that when the photovoltaic panel is negatively biased, the leakage current anode ions (generally Na ions) flow into the cell, which reduces the parallel resistance of the cell, i.e. impurities are present in the semiconductor, and these impurities form the conductive channel inside the cell, reducing the current output of the photovoltaic panel, but the above attenuation is reversible.
In order to solve the above technical problem, a voltage to ground is applied to an ac side of a photovoltaic inverter, so as to raise the voltage to ground of the photovoltaic inverter, thereby achieving a PID suppression effect. In the working process of the photovoltaic module, the current of the PID suppression circuit needs to be monitored in real time to judge whether the insulation resistance to ground of the photovoltaic system is abnormal or not, and common current detection methods include a current sensor direct sampling method, a resistance voltage sampling inverse current calculation method and the like, which all need to arrange a sampling circuit in the PID suppression circuit, thereby increasing the complexity of the PID suppression circuit.
Disclosure of Invention
The invention provides a current detection method, a device and equipment of a photovoltaic PID suppression circuit, which are used for obtaining the current of the PID suppression circuit without arranging a current sensor and other sampling circuits in the PID suppression circuit and reducing the complexity of the circuit.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a current detection method for a photovoltaic PID suppression circuit, where the photovoltaic PID suppression circuit includes a PID dc power supply, a first resistor, a second resistor, and a third resistor, one end of the first resistor, one end of the second resistor, and one end of the third resistor are all connected to an anode of the PID dc power supply, the other end of the first resistor is connected to a first phase line, the other end of the second resistor is connected to a second phase line, the other end of the third resistor is connected to a third phase line, and a cathode of the PID dc power supply is grounded; the resistance value of the first resistor, the resistance value of the second resistor and the resistance value of the third resistor are the same and are first resistance values;
the current detection method comprises the following steps:
acquiring any one of a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground, or a third voltage of the third phase line to the ground;
acquiring a fourth voltage of the PID direct-current power supply;
acquiring a phase voltage of a phase line corresponding to the voltage to ground;
and determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value.
According to an embodiment of the present invention, the determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage, and the first resistance value includes:
obtaining the voltage of two ends of a resistor connected with the phase line corresponding to the ground voltage by taking the difference between the ground voltage and the fourth voltage;
obtaining direct current voltages at two ends of the resistor by taking difference between the phase voltage and the voltages at two ends of the resistor;
obtaining the current flowing through the resistor according to the direct-current voltage and the first resistance value;
and acquiring a triple value of the current as the current of the photovoltaic PID suppression circuit.
According to an embodiment of the present invention, the obtaining the phase voltage of the phase line corresponding to the voltage to ground includes:
when a first voltage of the first phase line to the ground is obtained, a first line voltage between the first phase line and the second phase line is obtained; acquiring a first phase voltage according to the first line voltage;
or when a second voltage of the second phase line to the ground is obtained, obtaining a second line voltage between the second phase line and the third phase line; acquiring a second phase voltage according to the second line voltage;
or when a third voltage of the third phase line to the ground is obtained, obtaining a third line voltage between the third phase line and the first phase line; and acquiring a third phase voltage according to the third line voltage.
According to an embodiment of the present invention, the obtaining the first line voltage between the first phase line and the second phase line includes:
when a first voltage of the first phase line to the ground is obtained, a second voltage of the second phase line to the ground is obtained, and the first line voltage is obtained according to a difference value of the first voltage and the second voltage;
the acquiring of the second line voltage between the second phase line and the third phase line comprises:
when a second voltage of the second phase line to the ground is obtained, a third voltage of the third phase line to the ground is obtained, and the second line voltage is obtained according to the difference value of the second voltage and the third voltage;
the acquiring of the third line voltage between the third phase line and the first phase line comprises:
when a third voltage of the third phase line to the ground is obtained, a first voltage of the first phase line to the ground is obtained, and the third line voltage is obtained according to a difference value of the third voltage and the first voltage.
According to one embodiment of the invention, the current detection method of the photovoltaic PID suppression circuit comprises the following steps:
respectively acquiring a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground and a third voltage of the third phase line to the ground;
acquiring a fourth voltage of the PID direct-current power supply;
respectively acquiring a first phase voltage of the first phase line, a second phase voltage of the second phase line and a third phase voltage of the third phase line;
and determining the current of the photovoltaic PID suppression circuit according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first phase voltage, the second phase voltage, the third phase voltage and the first resistance value.
According to an embodiment of the present invention, the determining the current of the photovoltaic PID suppression circuit according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first phase voltage, the second phase voltage, the third phase voltage, and the first resistance value includes:
obtaining the voltage at two ends of the first resistor by taking the difference between the first voltage and the fourth voltage; obtaining the voltage at two ends of the second resistor by taking the difference between the second voltage and the fourth voltage; obtaining the voltage at two ends of the third resistor by taking the difference between the third voltage and the fourth voltage;
obtaining a direct current voltage at two ends of the first resistor by taking a difference between the first phase voltage and the voltage at two ends of the first resistor; obtaining a direct current voltage at two ends of the second resistor by taking a difference between the second phase voltage and the voltage at two ends of the second resistor; obtaining a direct current voltage at two ends of the third resistor by taking a difference between the third phase voltage and the voltage at two ends of the third resistor;
and acquiring the sum of the direct current voltage at the two ends of the first resistor, the direct current voltage at the two ends of the second resistor and the direct current voltage at the two ends of the third resistor, and determining the current of the photovoltaic PID suppression circuit by taking the ratio of the sum and the first resistance value.
According to an embodiment of the present invention, obtaining the first phase voltage of the first phase line, the second phase voltage of the second phase line, and the third phase voltage of the third phase line, respectively, includes:
respectively acquiring a first line voltage between the first phase line and the second phase line, a second line voltage between the second phase line and the third phase line, and a third line voltage between the third phase line and the first phase line;
acquiring the first phase voltage according to the first line voltage; acquiring the second phase voltage according to the second line voltage; and acquiring the third phase voltage according to the third line voltage.
According to an embodiment of the present invention, the first line voltage is a difference of the first voltage and the second voltage; the second line voltage is a difference between the second voltage and the third voltage; the third line voltage is a difference between the third voltage and the first voltage.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a current detection apparatus for a photovoltaic PID suppression circuit, where the photovoltaic PID suppression circuit includes a PID dc power supply, a first resistor, a second resistor, and a third resistor, one end of the first resistor, one end of the second resistor, and one end of the third resistor are all connected to an anode of the PID dc power supply, the other end of the first resistor is connected to a first phase line, the other end of the second resistor is connected to a second phase line, the other end of the third resistor is connected to a third phase line, and a cathode of the PID dc power supply is grounded; the resistance value of the first resistor, the resistance value of the second resistor and the resistance value of the third resistor are the same and are first resistance values;
the current detection device includes:
a ground voltage acquiring module, configured to acquire any one of a first voltage of the first phase line to ground, a second voltage of the second phase line to ground, and a third voltage of the third phase line to ground;
the fourth voltage acquisition module is used for acquiring a fourth voltage of the PID direct-current power supply;
the phase voltage acquisition module is used for acquiring phase voltage of a phase line corresponding to the voltage to ground;
and the current determining module is used for determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value.
To achieve the above object, a third aspect of the present invention provides an electronic device for detecting current of a photovoltaic PID suppression circuit, the electronic device including:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method for current detection by a photovoltaic PID suppression circuit as previously described.
To achieve the above object, a fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the current detection method of the photovoltaic PID suppression circuit as described above.
According to the current detection method, the device and the equipment of the photovoltaic PID suppression circuit, the current detection method comprises the following steps: acquiring any one of a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground, or a third voltage of the third phase line to the ground; acquiring a fourth voltage of the PID direct-current power supply; acquiring a phase voltage of a phase line corresponding to the voltage to ground; and determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value. The current of the PID suppression circuit can be obtained without arranging a current sensor and other sampling circuits in the PID suppression circuit, and the complexity of the circuit is reduced.
Drawings
FIG. 1 is a schematic diagram of a photovoltaic PID suppression circuit in an embodiment of the invention;
fig. 2 is a flowchart of a current detection method of a photovoltaic PID suppression circuit according to an embodiment of the present invention;
FIG. 3 is a flow chart of a current detection method of a photovoltaic PID suppression circuit according to an embodiment of the invention;
FIG. 4 is a block diagram of a current detection device of a photovoltaic PID suppression circuit according to an embodiment of the invention;
fig. 5 is a block schematic diagram of the current detection electronics of the photovoltaic PID suppression circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before the current detection method of the photovoltaic PID suppression circuit provided by the embodiment of the present invention is introduced, the structure of the photovoltaic PID suppression circuit is introduced. Fig. 1 is a schematic diagram of a photovoltaic PID suppression circuit in an embodiment of the present invention. As shown in fig. 1, the photovoltaic PID suppression circuit 100 includes a PID dc power supply 200, a first resistor R1, a second resistor R2, and a third resistor R3, wherein one end of the first resistor R1, one end of the second resistor R2, and one end of the third resistor R3 are all connected to the positive electrode of the PID dc power supply 200, the other end of the first resistor R1 is connected to the first phase line a, the other end of the second resistor R2 is connected to the second phase line B, the other end of the third resistor R3 is connected to the third phase line C, and the negative electrode of the PID dc power supply 200 is grounded; the resistance of the first resistor R1, the resistance of the second resistor R2 and the resistance of the third resistor R3 are the same and are the first resistance R.
In the prior art, in order to detect the current of the PID suppression circuit, a current sensor or a resistor is often arranged between the negative electrode of the PID dc power supply 200 and the ground, so as to directly read the current value according to the current sensor, or sample the voltage of the resistor and the resistance value of the resistor to calculate the current value.
The first resistor R1, the second resistor R2 and the third resistor R3 are arranged in a manner of the prior art, and are used for constructing a virtual ground N point.
Therefore, the embodiment of the invention provides a current detection method of a photovoltaic PID suppression circuit, which includes the steps that any one of a first voltage of a first phase line to the ground, a second voltage of a second phase line to the ground, and a third voltage of a third phase line to the ground is acquired; then, acquiring a fourth voltage of the PID direct-current power supply; then obtaining phase voltage of a phase line corresponding to the voltage to ground; and finally, determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value. Therefore, the current of the PID suppression circuit can be obtained by utilizing the numerical value sampled by the existing power grid to ground voltage sampling circuit and the existing PID direct-current power supply voltage by adopting the circuit, the improved scheme cancels the originally special circuit for sampling the current of the PID suppression circuit, the cost is reduced, and compared with the scheme of serially sampling the resistor in a loop, the sampling precision can be improved, the method is simple and efficient, the hardware complexity of the system is reduced, the reliability of the system is improved, and the power loss of the system is also reduced.
The following describes in detail a current detection method of a photovoltaic PID suppression circuit according to an embodiment of the present invention.
Example one
Fig. 2 is a flowchart of a current detection method of a photovoltaic PID suppression circuit according to an embodiment of the present invention.
As shown in fig. 2, the current detection method includes the steps of:
s101, acquiring a first voltage U of a first phase line A to the groundAPOr second voltage U of second phase line B to groundBPOr the third phase line C to groundCPAny one of them is grounded;
that is, the first voltage U is obtainedAPOr the second voltage UBPOr a third voltage UCPAny one of the three. It will be appreciated that the first voltage U of the first phase a to groundAPOr second voltage U of second phase line B to groundBPOr the third phase line C to groundCPCan be obtained from the existing power grid voltage-to-ground sampling circuit. To obtain the first voltage UAPFor example.
S102, acquiring a fourth voltage U of the PID direct-current power supplyPID；
Wherein the fourth voltage UPIDThe method can be obtained from the numerical value sampled by the existing PID direct-current power supply voltage adopting circuit.
S103, acquiring a phase voltage of a phase line corresponding to the voltage to ground;
that is, if the voltage to ground acquired in step S101 is the first voltage UAPThen, in step S103, the first phase voltage U of the first phase line a is obtainedA0If the voltage to ground obtained in step S101 is the second voltage UBPThen the second phase voltage U of the second phase line B is acquired in step S103B0If the voltage to ground acquired in step S101 is the third voltagePress UCPThen, in step S103, the third phase voltage U of the third phase line C is obtainedC0. Since, in step S101, the first voltage U is acquiredAPFurther, in step S103, the first phase voltage U should be acquiredA0。
It should be noted that a sampling circuit may be directly provided in the PID suppression circuit to collect the phase voltage. The phase voltage can also be acquired by acquiring the line voltage and converting the line voltage. The line voltage can also be calculated by the voltage to ground, and then the phase voltage is obtained by conversion. The sampling circuit is arranged, the complexity of the circuit is increased, the line voltage is calculated through the voltage to ground, and the phase voltage is obtained through conversion, so that the complexity of the circuit is reduced.
Specifically, the step S103 of acquiring the phase voltage of the phase line corresponding to the voltage to ground includes:
when a first voltage U of the first phase line A to the ground is obtainedAPThen, a first line voltage U between a first phase line A and a second phase line B is obtainedAB(ii) a According to the first line voltage UABObtaining a first phase voltage UA0；
Or when acquiring the second voltage U of the second phase line B to the groundBPThen, a second line voltage U between the second phase line B and the third phase line C is obtainedBC(ii) a According to the second line voltage UBCObtaining the voltage U of the second phaseB0；
Or when acquiring the third voltage U of the third phase line C to the groundCPThen, a third line voltage U between the third phase line C and the first phase line A is obtainedCA(ii) a According to the third line voltage UCAObtaining a third phase voltage UC0。
Wherein the line voltage is divided by
I.e. the phase voltage. In this embodiment the line voltage can be picked up.
According to one embodiment of the invention, a first line voltage U between a first phase line a and a second phase line B is obtainedABThe method comprises the following steps:
when the first phase line A pair is obtainedFirst voltage U of groundAPThen, a second voltage U of the second phase line B to the ground is obtainedBPAccording to a first voltage UAPAnd a second voltage UBPObtaining a first line voltage UAB；
Obtaining a second line voltage U between a second phase line B and a third phase line CBCThe method comprises the following steps:
when the second voltage U of the second phase line B to the ground is obtainedBPThen, a third voltage U of the third phase line C to the ground is obtainedCPAccording to the second voltage UBPAnd a third voltage UCPObtaining a second line voltage UBC；
Obtaining a third line voltage U between a third phase line C and a first phase line ACAThe method comprises the following steps:
when the third voltage U of the third phase line C to the ground is obtainedCPThen, a first voltage U of the first phase line A to the ground is obtainedAPAccording to a third voltage UCPAnd a first voltage UAPObtaining the third line voltage UCA。
Wherein, in this embodiment, the line voltage may be obtained by calculation. The sampling circuit is omitted.
And S104, determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value.
According to one embodiment of the invention, determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value comprises:
obtaining the voltage of two ends of a resistor connected with the phase line corresponding to the voltage of the earth voltage by taking the difference between the earth voltage and the fourth voltage;
the voltage difference between the phase voltage and the voltage at the two ends of the resistor is obtained to obtain the direct current voltage at the two ends of the resistor;
obtaining the current flowing through the resistor according to the direct-current voltage and the first resistance value;
and acquiring a triple value of the current as the current of the photovoltaic PID suppression circuit.
It should be noted that the voltage to ground is taken as the first voltage UAPFor example, the phase voltage and its counterpart are the first phase voltage UA0First resistanceA value r, and a first voltage UAPThe corresponding phase line is a first phase line A, the resistor connected with the first phase line A is a first resistor R1, and the voltage at two ends of the first resistor R1 is UAP-UPIDWherein the first voltage UAPBoth AC and DC components; then, pass through UA0-(UAP-UPID) I.e. the ac component is subtracted from the phase voltage leaving only a dc component. Thus, the direct-current voltage U across the first resistor R1 is obtainedA0-(UAP-UPID) Then, according to ohm's law, the current I flowing through the first resistor R1 is obtained1＝[UA0-(UAP-UPID)]And r, finally, the current I of the photovoltaic PID suppression circuit is 3I1. Wherein the content of the first and second substances,
that is to say that the first and second electrodes,
therefore, the current of the photovoltaic PID suppression circuit is obtained through the method, a sampling circuit or a current sensor is not required to be arranged, the complexity of the circuit is reduced, and the cost is reduced. The method has simple steps.
Example two
Fig. 3 is a flowchart of a current detection method of a photovoltaic PID suppression circuit according to an embodiment of the present invention. The embodiment is a further optimization of the first embodiment, wherein, as shown in fig. 3, the current detection method of the photovoltaic PID suppression circuit includes the following steps:
s201, respectively obtaining a first voltage U of a first phase line A to the groundAPA second voltage U of the second phase line B to the groundBPAnd a third voltage U of the third phase line C to groundCP(ii) a Wherein the first voltage UAPA second voltage UBPA third voltage UCPCan be obtained from the existing power grid voltage-to-ground sampling circuit.
S202, acquiring a fourth voltage U of the PID direct-current power supplyPID(ii) a Wherein the fourth voltage UPIDCan be supplied from the existing PID direct current power supplyThe voltage is obtained from the value sampled by the circuit.
S203, respectively obtaining first phase voltages U of the first phase lines AA0A second phase voltage U of a second phase line BB0And a third phase voltage U of a third phase line CC0；
First phase voltage UA0Second phase voltage UB0A third phase voltage UC0Can be obtained by a sampling circuit; or from line voltage conversion.
According to one embodiment of the invention, the first phase voltages U of the first phase lines a are respectively detectedA0A second phase voltage U of a second phase line BB0And a third phase voltage U of a third phase line CC0The method comprises the following steps:
respectively obtaining a first line voltage U between a first phase line A and a second phase line BABA second line voltage U between the second phase line B and the third phase line CBCA third line voltage U between the third phase line C and the first phase line ACA；
According to the first line voltage UABObtaining a first phase voltage UA0(ii) a According to the second line voltage UBCObtaining the voltage U of the second phaseB0(ii) a According to the third line voltage UCAObtaining a third phase voltage UC0。
It can be understood that the first line voltage UABSecond line voltage UBCThird line voltage UCACan be directly acquired by the sampling circuit.
According to one embodiment of the invention, the first line voltage UABIs a first voltage UAPAnd a second voltage UBPA difference of (d); second line voltage UBCIs a second voltage UBPAnd a third voltage UCPA difference of (d); third line voltage UCAIs a third voltage UCPAnd a first voltage UAPThe difference of (a).
It can be understood that the first line voltage UABSecond line voltage UBCThird line voltage UCAMay be obtained by calculation. And a sampling circuit is not required.
S204, according to the first voltage UAPA second voltage UBPA third voltage UCPA fourth voltage UPIDA first phase voltage UA0Second phase voltage UB0A third phase voltage UC0And the first resistance r determines the current of the photovoltaic PID suppression circuit.
According to an embodiment of the invention, the first voltage U is usedAPA second voltage UBPA third voltage UCPA fourth voltage UPIDA first phase voltage UA0Second phase voltage UB0A third phase voltage UC0And the first resistance r determining the current of the photovoltaic PID suppression circuit comprises:
for the first voltage UAPAnd a fourth voltage UPIDTaking the difference to obtain the voltage at two ends of the first resistor R1; for the second voltage UBPAnd a fourth voltage UPIDTaking the difference to obtain the voltage at two ends of the second resistor R2; for the third voltage UCPAnd a fourth voltage UPIDObtaining the voltage at two ends of the third resistor R3 by difference;
to the first phase voltage UA0The difference is obtained between the voltage of the two ends of the first resistor R1 to obtain the direct current voltage of the two ends of the first resistor R1; for second phase voltage UB0The difference is obtained between the voltage of the two ends of the second resistor R2 to obtain the direct current voltage of the two ends of the second resistor R2; to the third phase voltage UC0The difference is obtained between the voltage at the two ends of the third resistor R3 to obtain the direct current voltage at the two ends of the third resistor R3;
and acquiring the sum of the direct current voltage at the two ends of the first resistor R1, the direct current voltage at the two ends of the second resistor R2 and the direct current voltage at the two ends of the third resistor R3, and determining the current of the photovoltaic PID suppression circuit by taking the ratio of the sum and the first resistance value R.
The current of the photovoltaic PID suppression circuit is described in formula as follows:
in the embodiment, the three-phase voltage of the alternating current is taken into consideration, and the mutual influence among the three-phase voltages is taken into consideration, so that the obtained current of the photovoltaic PID suppression circuit has real-time performance, and the sampling frequency level of the current sensor can be reached.
EXAMPLE III
Fig. 4 is a block schematic diagram of a current detection device of a photovoltaic PID suppression circuit according to an embodiment of the present invention. The photovoltaic PID suppression circuit comprises a PID direct-current power supply, a first resistor, a second resistor and a third resistor, wherein one end of the first resistor, one end of the second resistor and one end of the third resistor are connected with the anode of the PID direct-current power supply, the other end of the first resistor is connected with a first phase line, the other end of the second resistor is connected with a second phase line, the other end of the third resistor is connected with a third phase line, and the cathode of the PID direct-current power supply is grounded; the resistance value of the first resistor, the resistance value of the second resistor and the resistance value of the third resistor are the same and are first resistance values;
as shown in fig. 4, the current detection device includes:
a ground voltage acquiring module 101, configured to acquire any one of a first voltage of a first phase line to ground, a second voltage of a second phase line to ground, or a third voltage of a third phase line to ground;
a fourth voltage obtaining module 102, configured to obtain a fourth voltage of the PID dc power supply;
a phase voltage acquisition module 103, configured to acquire a phase voltage of a phase line corresponding to the voltage to ground;
and a current determining module 104, configured to determine a current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage, and the first resistance value.
According to one embodiment of the invention, the current determination module comprises:
the first calculating unit is used for obtaining the voltage of the voltage to ground corresponding to two ends of a resistor connected with a phase line by taking the difference between the voltage to ground and the fourth voltage;
the second calculation unit is used for obtaining direct-current voltages at two ends of the resistor by taking the difference between the phase voltage and the voltage at two ends of the resistor;
the third calculating unit is used for acquiring the current flowing through the resistor according to the direct-current voltage and the first resistance value;
and the fourth calculation unit is used for acquiring a triple value of the current as the current of the photovoltaic PID suppression circuit.
According to one embodiment of the present invention, a phase voltage acquisition module includes:
the first phase voltage acquisition module is used for acquiring a first line voltage between the first phase line and the second phase line when acquiring a first voltage of the first phase line to the ground; acquiring a first phase voltage according to the first line voltage;
or the second phase voltage obtaining module is used for obtaining a second line voltage between the second phase line and the third phase line when obtaining a second voltage of the second phase line to the ground; acquiring a second phase voltage according to the second line voltage;
or the third phase voltage obtaining module is used for obtaining a third line voltage between the third phase line and the first phase line when obtaining a third voltage of the third phase line to the ground; and acquiring a third phase voltage according to the third line voltage.
According to an embodiment of the invention, the apparatus further comprises:
the first line voltage acquisition module is used for acquiring a second voltage of a second phase line to the ground when acquiring a first voltage of the first phase line to the ground, and acquiring a first line voltage according to a difference value of the first voltage and the second voltage;
or the second line voltage obtaining module is used for obtaining a third voltage of a third phase line to the ground when obtaining a second voltage of the second phase line to the ground, and obtaining a second line voltage according to a difference value of the second voltage and the third voltage;
or the third line voltage obtaining module is configured to, when obtaining a third voltage of the third phase line to the ground, obtain a first voltage of the first phase line to the ground, and obtain the third line voltage according to a difference between the third voltage and the first voltage.
According to an embodiment of the present invention, the current detection apparatus of the photovoltaic PID suppression circuit further includes:
the first voltage acquisition module is used for acquiring a first voltage of a first phase line to the ground;
the second voltage acquisition module is used for acquiring a second voltage of the second phase relative to the ground;
the third voltage acquisition module is used for acquiring a third voltage of a third phase line to the ground;
the fourth voltage acquisition module is used for acquiring a fourth voltage of the PID direct-current power supply;
the first phase voltage acquisition module is used for acquiring a first phase voltage of a first phase line;
the second phase voltage acquisition module is used for acquiring a second phase voltage of a second phase line;
the third phase voltage acquisition module is used for acquiring a third phase voltage of a third phase line;
and the current determining module is used for determining the current of the photovoltaic PID suppression circuit according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first phase voltage, the second phase voltage, the third phase voltage and the first resistance value.
According to one embodiment of the invention, the current determination module comprises:
the fifth calculating unit is used for obtaining the voltage at two ends of the first resistor by taking the difference between the first voltage and the fourth voltage; obtaining the voltage at two ends of the second resistor by taking the difference between the second voltage and the fourth voltage; obtaining the voltage at two ends of a third resistor by taking the difference between the third voltage and the fourth voltage;
the sixth calculating unit is used for obtaining the direct-current voltage at the two ends of the first resistor by taking the difference between the first phase voltage and the voltage at the two ends of the first resistor; obtaining direct current voltages at two ends of a second resistor by taking difference between the second phase voltage and the voltage at two ends of the second resistor; obtaining the direct current voltage at the two ends of the third resistor by taking the difference between the third phase voltage and the voltage at the two ends of the third resistor;
and the seventh calculating unit is used for obtaining the sum of the direct current voltage at the two ends of the first resistor, the direct current voltage at the two ends of the second resistor and the direct current voltage at the two ends of the third resistor, and determining the current of the photovoltaic PID suppression circuit by taking the ratio of the sum and the first resistance value.
According to an embodiment of the present invention, the current detection device of the photovoltaic PID suppression circuit further includes:
the first line voltage acquisition module is used for acquiring a first line voltage between the first phase line and the second phase line;
the second line voltage acquisition module is used for acquiring second line voltage between the second phase line and the third phase line;
the third line voltage acquisition module is used for acquiring a third line voltage between a third phase line and the first phase line;
the first phase voltage acquisition module is used for acquiring a first phase voltage according to the first line voltage; the second phase voltage acquisition module is used for acquiring a second phase voltage according to a second line voltage; and the third phase voltage acquisition module is used for acquiring a third phase voltage according to the third line voltage.
According to an embodiment of the present invention, the first line voltage is a difference between the first voltage and the second voltage; the second line voltage is the difference value of the second voltage and the third voltage; the third line voltage is a difference between the third voltage and the first voltage.
The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. The functions of the related modules are already described in the foregoing, and are not described in detail herein.
Example four
Fig. 5 is a block schematic diagram of the current detection electronics of the photovoltaic PID suppression circuit according to an embodiment of the present invention. As shown in fig. 5, the electronic device 400 includes:
one or more processors 401;
a storage 402 for storing one or more programs;
when the one or more programs are executed by the one or more processors 401, the one or more processors 401 may cause the one or more processors 401 to implement the current sensing method of the photovoltaic PID suppression circuit as previously described.
As shown in fig. 5, the electronic device 400 includes a processor 401, a storage device 402, an input device 403, and an output device 404; the number of the processors 401 in the device may be one or more, and one processor 401 is taken as an example in fig. 5; the processor 401, the storage means 402, the input means 403 and the output means 404 in the device may be connected by a bus or other means, as exemplified by a bus in fig. 5.
The storage device 402 is a computer-readable storage medium, and can be used to store software programs, computer-executable programs, and modules, such as program instructions corresponding to the current detection method of the photovoltaic PID suppression circuit in the embodiment of the present invention. The processor 401 executes various functional applications and data processing of the device by running software programs, instructions and modules stored in the storage device 402, that is, implements the above-described current detection method of the photovoltaic PID suppression circuit.
The storage device 402 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the storage 402 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the storage 402 may further include memory located remotely from the processor 401, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 403 is operable to receive an inputted instruction request and generate key signal inputs related to the setting and function control of the apparatus. The output device 404 may include a display device such as a display screen.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by the processor 401, implements the current detection method of the photovoltaic PID suppression circuit as described above.
That is to say, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, where the computer-executable instructions can perform related operations in the current detection method of the photovoltaic PID suppression circuit provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
In summary, according to the current detection method, apparatus and device of the photovoltaic PID suppression circuit provided in the embodiments of the present invention, the current detection method includes the following steps: acquiring any one of a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground, or a third voltage of the third phase line to the ground; acquiring a fourth voltage of the PID direct-current power supply; acquiring a phase voltage of a phase line corresponding to the voltage to ground; and determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value. The current of the PID suppression circuit can be obtained without arranging a current sensor and other sampling circuits in the PID suppression circuit, and the complexity of the circuit is reduced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The current detection method of the photovoltaic PID suppression circuit is characterized in that the photovoltaic PID suppression circuit comprises a PID direct-current power supply, a first resistor, a second resistor and a third resistor, wherein one end of the first resistor, one end of the second resistor and one end of the third resistor are connected with the anode of the PID direct-current power supply, the other end of the first resistor is connected with a first phase line, the other end of the second resistor is connected with a second phase line, the other end of the third resistor is connected with a third phase line, and the cathode of the PID direct-current power supply is grounded; the resistance value of the first resistor, the resistance value of the second resistor and the resistance value of the third resistor are the same and are first resistance values;
the current detection method comprises the following steps:
acquiring any one of a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground, or a third voltage of the third phase line to the ground;
acquiring a fourth voltage of the PID direct-current power supply;
acquiring a phase voltage of a phase line corresponding to the voltage to ground;
and determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value.
2. The method for detecting the current of the photovoltaic PID suppression circuit according to claim 1, wherein the determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value includes:
obtaining the voltage of two ends of a resistor connected with the phase line corresponding to the ground voltage by taking the difference between the ground voltage and the fourth voltage;
obtaining direct current voltages at two ends of the resistor by taking difference between the phase voltage and the voltages at two ends of the resistor;
obtaining the current flowing through the resistor according to the direct-current voltage and the first resistance value;
and acquiring a triple value of the current as the current of the photovoltaic PID suppression circuit.
3. The current detection method of the photovoltaic PID suppression circuit according to claim 1, wherein the obtaining the phase voltage of the phase line corresponding to the voltage to ground comprises:
when a first voltage of the first phase line to the ground is obtained, a first line voltage between the first phase line and the second phase line is obtained; acquiring a first phase voltage according to the first line voltage;
or when a second voltage of the second phase line to the ground is obtained, obtaining a second line voltage between the second phase line and the third phase line; acquiring a second phase voltage according to the second line voltage;
or when a third voltage of the third phase line to the ground is obtained, obtaining a third line voltage between the third phase line and the first phase line; and acquiring a third phase voltage according to the third line voltage.
4. The method of current detection by a photovoltaic PID suppression circuit according to claim 3,
the acquiring of the first line voltage between the first phase line and the second phase line includes:
when a first voltage of the first phase line to the ground is obtained, a second voltage of the second phase line to the ground is obtained, and the first line voltage is obtained according to a difference value of the first voltage and the second voltage;
the acquiring of the second line voltage between the second phase line and the third phase line comprises:
when a second voltage of the second phase line to the ground is obtained, a third voltage of the third phase line to the ground is obtained, and the second line voltage is obtained according to the difference value of the second voltage and the third voltage;
the acquiring of the third line voltage between the third phase line and the first phase line comprises:
when a third voltage of the third phase line to the ground is obtained, a first voltage of the first phase line to the ground is obtained, and the third line voltage is obtained according to a difference value of the third voltage and the first voltage.
5. The current detection method of the photovoltaic PID suppression circuit according to claim 1, characterized by comprising the steps of:
respectively acquiring a first voltage of the first phase line to the ground, a second voltage of the second phase line to the ground and a third voltage of the third phase line to the ground;
acquiring a fourth voltage of the PID direct-current power supply;
respectively acquiring a first phase voltage of the first phase line, a second phase voltage of the second phase line and a third phase voltage of the third phase line;
and determining the current of the photovoltaic PID suppression circuit according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first phase voltage, the second phase voltage, the third phase voltage and the first resistance value.
6. The method according to claim 5, wherein the determining the current of the photovoltaic PID suppression circuit according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first phase voltage, the second phase voltage, the third phase voltage, and the first resistance value comprises:
obtaining the voltage at two ends of the first resistor by taking the difference between the first voltage and the fourth voltage; obtaining the voltage at two ends of the second resistor by taking the difference between the second voltage and the fourth voltage; obtaining the voltage at two ends of the third resistor by taking the difference between the third voltage and the fourth voltage;
obtaining a direct current voltage at two ends of the first resistor by taking a difference between the first phase voltage and the voltage at two ends of the first resistor; obtaining a direct current voltage at two ends of the second resistor by taking a difference between the second phase voltage and the voltage at two ends of the second resistor; obtaining a direct current voltage at two ends of the third resistor by taking a difference between the third phase voltage and the voltage at two ends of the third resistor;
and acquiring the sum of the direct current voltage at the two ends of the first resistor, the direct current voltage at the two ends of the second resistor and the direct current voltage at the two ends of the third resistor, and determining the current of the photovoltaic PID suppression circuit by taking the ratio of the sum and the first resistance value.
7. The method for detecting the current of the photovoltaic PID suppression circuit according to claim 5, wherein the obtaining the first phase voltage of the first phase line, the second phase voltage of the second phase line, and the third phase voltage of the third phase line respectively comprises:
respectively acquiring a first line voltage between the first phase line and the second phase line, a second line voltage between the second phase line and the third phase line, and a third line voltage between the third phase line and the first phase line;
acquiring the first phase voltage according to the first line voltage; acquiring the second phase voltage according to the second line voltage; and acquiring the third phase voltage according to the third line voltage.
8. The method of current detection by a photovoltaic PID suppression circuit according to claim 7,
the first line voltage is a difference between the first voltage and the second voltage;
the second line voltage is a difference between the second voltage and the third voltage;
the third line voltage is a difference between the third voltage and the first voltage.
9. The current detection device of the photovoltaic PID suppression circuit is characterized in that the photovoltaic PID suppression circuit comprises a PID direct-current power supply, a first resistor, a second resistor and a third resistor, wherein one end of the first resistor, one end of the second resistor and one end of the third resistor are connected with the anode of the PID direct-current power supply, the other end of the first resistor is connected with a first phase line, the other end of the second resistor is connected with a second phase line, the other end of the third resistor is connected with a third phase line, and the cathode of the PID direct-current power supply is grounded; the resistance value of the first resistor, the resistance value of the second resistor and the resistance value of the third resistor are the same and are first resistance values;
the current detection device includes:
a ground voltage acquiring module, configured to acquire any one of a first voltage of the first phase line to ground, a second voltage of the second phase line to ground, and a third voltage of the third phase line to ground;
the fourth voltage acquisition module is used for acquiring a fourth voltage of the PID direct-current power supply;
the phase voltage acquisition module is used for acquiring phase voltage of a phase line corresponding to the voltage to ground;
and the current determining module is used for determining the current of the photovoltaic PID suppression circuit according to the voltage to ground, the fourth voltage, the phase voltage and the first resistance value.
10. A current sensing electronic device of a photovoltaic PID suppression circuit, the electronic device comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of current detection for a photovoltaic PID suppression circuit as claimed in any one of claims 1 to 8;
wherein the program of the current detection method of the photovoltaic PID suppression circuit is also stored on a computer readable storage medium.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116722590A (en) * | 2023-08-08 | 2023-09-08 | 锦浪科技股份有限公司 | PID effect inhibition method and system and photovoltaic system |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5529300B1 (en) * | 2013-01-23 | 2014-06-25 | 一般財団法人 関西電気保安協会 | High voltage insulation monitoring method and high voltage insulation monitoring device |
| CN103973217A (en) * | 2014-05-19 | 2014-08-06 | 无锡上能新能源有限公司 | Device for restraining PID effect of photovoltaic panel |
| CN104300584A (en) * | 2014-11-07 | 2015-01-21 | 深圳市永联科技有限公司 | High-security PID effect inhibition method |
| CN104617873A (en) * | 2015-02-02 | 2015-05-13 | 北京格林科电技术有限公司 | Method and device for suppressing potential induced degradation (PID) phenomenon of photovoltaic module through inverter |
| WO2015180623A1 (en) * | 2014-05-28 | 2015-12-03 | 阳光电源股份有限公司 | Non-isolated photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system |
| CN106526355A (en) * | 2016-10-13 | 2017-03-22 | 湖南工业大学 | Online testing method and online testing device for electric energy quality and insulating performance of micro power grid three-phase IT system |
| CN106771834A (en) * | 2017-02-25 | 2017-05-31 | 华为技术有限公司 | A kind of many DC source input wires detecting systems and photovoltaic group string formula inverter system |
| CN106961118A (en) * | 2017-03-24 | 2017-07-18 | 江苏固德威电源科技股份有限公司 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
| CN107069661A (en) * | 2017-04-28 | 2017-08-18 | 南京南瑞太阳能科技有限公司 | A kind of device for suppressing photovoltaic module PID effects |
| CN206962426U (en) * | 2017-04-28 | 2018-02-02 | 南京南瑞太阳能科技有限公司 | A kind of device for suppressing photovoltaic module PID effects |
| CN207442731U (en) * | 2017-09-22 | 2018-06-01 | 北京铂阳顶荣光伏科技有限公司 | A kind of electrical regulating system of the potential induction attenuation of photovoltaic generation |
| CN109188167A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
| CN111077356A (en) * | 2019-12-16 | 2020-04-28 | 广东格兰仕集团有限公司 | Current detection circuit, method, apparatus and storage medium |
| CN210608534U (en) * | 2019-09-24 | 2020-05-22 | 阳光电源股份有限公司 | Photovoltaic inverter system and PID control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111668817A (en) * | 2020-06-09 | 2020-09-15 | 广东电网有限责任公司东莞供电局 | Photovoltaic grid-connected control method and system for blocking fault current |
-
2021
- 2021-09-08 CN CN202111048218.0A patent/CN113687128B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5529300B1 (en) * | 2013-01-23 | 2014-06-25 | 一般財団法人 関西電気保安協会 | High voltage insulation monitoring method and high voltage insulation monitoring device |
| CN103973217A (en) * | 2014-05-19 | 2014-08-06 | 无锡上能新能源有限公司 | Device for restraining PID effect of photovoltaic panel |
| WO2015180623A1 (en) * | 2014-05-28 | 2015-12-03 | 阳光电源股份有限公司 | Non-isolated photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system |
| CN104300584A (en) * | 2014-11-07 | 2015-01-21 | 深圳市永联科技有限公司 | High-security PID effect inhibition method |
| CN104617873A (en) * | 2015-02-02 | 2015-05-13 | 北京格林科电技术有限公司 | Method and device for suppressing potential induced degradation (PID) phenomenon of photovoltaic module through inverter |
| CN106526355A (en) * | 2016-10-13 | 2017-03-22 | 湖南工业大学 | Online testing method and online testing device for electric energy quality and insulating performance of micro power grid three-phase IT system |
| CN106771834A (en) * | 2017-02-25 | 2017-05-31 | 华为技术有限公司 | A kind of many DC source input wires detecting systems and photovoltaic group string formula inverter system |
| CN106961118A (en) * | 2017-03-24 | 2017-07-18 | 江苏固德威电源科技股份有限公司 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
| CN107069661A (en) * | 2017-04-28 | 2017-08-18 | 南京南瑞太阳能科技有限公司 | A kind of device for suppressing photovoltaic module PID effects |
| CN206962426U (en) * | 2017-04-28 | 2018-02-02 | 南京南瑞太阳能科技有限公司 | A kind of device for suppressing photovoltaic module PID effects |
| CN207442731U (en) * | 2017-09-22 | 2018-06-01 | 北京铂阳顶荣光伏科技有限公司 | A kind of electrical regulating system of the potential induction attenuation of photovoltaic generation |
| CN109188167A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
| CN210608534U (en) * | 2019-09-24 | 2020-05-22 | 阳光电源股份有限公司 | Photovoltaic inverter system and PID control circuit |
| CN111077356A (en) * | 2019-12-16 | 2020-04-28 | 广东格兰仕集团有限公司 | Current detection circuit, method, apparatus and storage medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116722590A (en) * | 2023-08-08 | 2023-09-08 | 锦浪科技股份有限公司 | PID effect inhibition method and system and photovoltaic system |
| CN116722590B (en) * | 2023-08-08 | 2023-12-05 | 锦浪科技股份有限公司 | PID effect inhibition method and system and photovoltaic system |
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