WO2015169135A1

WO2015169135A1 - Anti-potential induced degradation photovoltaic power generation system, photovoltaic assembly and inverter

Info

Publication number: WO2015169135A1
Application number: PCT/CN2015/075841
Authority: WO
Inventors: 邹海晏; 张建; 陶磊; 余鸿
Original assignee: 阳光电源股份有限公司
Priority date: 2014-05-09
Filing date: 2015-04-03
Publication date: 2015-11-12
Also published as: CN103944502A; CN103944502B

Abstract

An anti-potential induced degradation (PID) photovoltaic power generation system, comprising a photovoltaic assembly (PV1) and an inverter which is connected to the photovoltaic assembly (PV1), and also comprising a diode (VD) of which one end is grounded and the other end is connected to an electrode of the photovoltaic assembly so as to ensure the stability, reliability and anti-PID characteristic of the photovoltaic power generation system. In addition, the anti-potential induced degradation photovoltaic power generation system also comprises an anti-PID photovoltaic assembly (PV1) and an anti-PID inverter.

Description

Resistance to potential potential induced attenuation of photovoltaic systems, photovoltaic modules and inverters

This application claims priority to Chinese Patent Application No. 201410196200.9, entitled "Anti-potential induced-attenuated photovoltaic power generation system, photovoltaic modules and inverters", which was submitted to the Chinese Patent Office on May 9, 2014. The content is incorporated herein by reference.

Technical field

The present invention relates to the field of photovoltaic power generation technology, and more particularly to a potential potential induced attenuation PID photovoltaic power generation system, an anti-PID photovoltaic module, and an anti-PID inverter.

Background technique

The PID (potential induced decay) effect refers to the phenomenon that the potential high voltage between the live part of the photovoltaic module, the grounding frame or the grounded external part causes a large attenuation of the working efficiency of the photovoltaic module.

To avoid the PID effect, the most common method is to ground the PV module. However, when multiple photovoltaic modules in a photovoltaic power generation system pass through the common AC side of the inverter, the application of the method is likely to cause a circulation of the photovoltaic power generation system, thereby threatening the normal operation of the system.

Therefore, how to ensure the stable reliability and anti-PID characteristics of the photovoltaic power generation system has become an urgent problem to be solved by those skilled in the art.

Summary of the invention

In view of this, the present invention provides an anti-PID photovoltaic power generation system, an anti-PID photovoltaic component, and an anti-PID inverter to ensure stable reliability and anti-PID characteristics of the photovoltaic power generation system.

An anti-PID photovoltaic power generation system includes: a photovoltaic module, an inverter connected to the photovoltaic module, and a diode connected to one end of the photovoltaic module and having the other end connected to the electrode of the photovoltaic module.

Wherein, when the photovoltaic component is a photovoltaic component that requires no negative bias of the negative electrode to the ground, the diode anode is grounded and the cathode is connected to the negative electrode of the photovoltaic component.

Wherein, when the photovoltaic component is a photovoltaic component that does not have a negative bias voltage from the positive electrode to the ground, The pole anode is grounded and the cathode is connected to the anode of the photovoltaic module.

Wherein, when the photovoltaic component is a photovoltaic component that does not have a positive bias to the ground, the diode cathode is grounded and the anode is connected to the negative electrode of the photovoltaic component.

Wherein, when the photovoltaic component is a photovoltaic component that does not have a positive bias to the ground, the diode cathode is grounded and the anode is connected to the positive electrode of the photovoltaic component.

Optionally, the method further includes: a resistor connected between the electrode of the photovoltaic component and the diode, or a resistor connected between the diode and the ground.

Optionally, when the photovoltaic component is a photovoltaic component that requires the negative electrode to have no negative bias to the ground, the method further includes: a positive electrode connected to the negative electrode of the photovoltaic component, a negative electrode connected to a cathode of the diode, or a positive electrode The voltage source of the anode and the negative pole of the diode is grounded.

Optionally, when the photovoltaic component is a photovoltaic component that does not have a negative bias to the positive electrode to the ground, the method further includes: a positive electrode connected to the positive electrode of the photovoltaic component, a negative electrode connected to a cathode of the diode, or a positive electrode The voltage source of the anode and the negative pole of the diode is grounded.

Optionally, when the photovoltaic component is a photovoltaic component that does not have a positive bias to the ground, the negative electrode is connected to the negative electrode of the photovoltaic component, the positive electrode is connected to the anode of the diode, or the negative electrode is connected. The voltage source of the cathode and anode of the diode is grounded.

Optionally, when the photovoltaic component is a photovoltaic component that does not have a positive bias to the ground, the negative electrode is connected to the positive electrode of the photovoltaic component, the positive electrode is connected to the anode of the diode, or the negative electrode is connected. The voltage source of the cathode and anode of the diode is grounded.

An anti-PID photovoltaic module comprising a photovoltaic component and a diode with one end grounded and the other end connected to the electrode of the photovoltaic component.

An anti-PID inverter includes an inverter and a diode whose one end is grounded and the other end is connected to an electrode input end of the inverter.

It can be seen from the above technical solution that the present invention integrates the existing photovoltaic module in the photovoltaic power generation system through the diode. Since the diode has unidirectional conductivity, it can not only block the circulation which may occur in the photovoltaic power generation system, but also The ground potential of each of the photovoltaic modules can be clamped to a preset value, thereby ensuring stable reliability and anti-PID characteristics of the photovoltaic power generation system.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1a-1b are schematic structural views of a photovoltaic power generation system in which a negative electrode of a type 1 photovoltaic module is grounded according to the prior art;

2a-2b are schematic structural views of a class 1 anti-PID photovoltaic power generation system disclosed in Embodiment 1 of the present invention;

3a-3b are schematic structural views of a Class 1 anti-PID photovoltaic power generation system with a resistor according to Embodiment 1 of the present invention;

4a-4b are schematic structural views of a Class 1 anti-PID photovoltaic power generation system with a voltage source according to Embodiment 1 of the present invention;

5a-5b are schematic structural diagrams of a class 2 anti-PID photovoltaic power generation system disclosed in Embodiment 2 of the present invention;

6a-6b are schematic structural views of a type 2 anti-PID photovoltaic power generation system with a resistor according to Embodiment 2 of the present invention;

7a-7b are schematic structural views of a class 2 anti-PID photovoltaic power generation system with a voltage source according to Embodiment 2 of the present invention;

8a-8b are schematic structural diagrams of a class 3 anti-PID photovoltaic power generation system disclosed in Embodiment 3 of the present invention;

9a-9b are schematic structural views of a three-type anti-PID photovoltaic power generation system with a resistor according to Embodiment 3 of the present invention;

10a-10b are schematic diagrams showing the structure of a class 3 anti-PID photovoltaic power generation system with a voltage source according to a third embodiment of the present invention;

11a-11b are schematic structural views of a four-type anti-PID photovoltaic power generation system disclosed in Embodiment 4 of the present invention;

12a-12b are schematic structural views of a four-type anti-PID photovoltaic power generation system with a resistor according to Embodiment 4 of the present invention;

13a-13b are schematic diagrams showing the structure of a class 4 anti-PID photovoltaic power generation system with a voltage source according to Embodiment 4 of the present invention.

Detailed ways

PV modules with different production processes need to meet different requirements when avoiding PID effect: some PV modules require that the anode does not have a negative bias to the ground, and some PV modules require that the anode does not have a negative bias to ground, and some PV modules require The negative electrode has no positive bias to ground, and some photovoltaic modules require that the positive electrode has no positive bias to ground. For the convenience of description, the above four types of photovoltaic modules are sequentially classified into a type 1 photovoltaic module, a class 2 photovoltaic module, a class 3 photovoltaic module, and a class 4 photovoltaic module.

Although grounding the photovoltaic components can effectively avoid the PID effect and improve the anti-PID characteristics of the photovoltaic power generation system. However, this method is only applicable to a photovoltaic power generation system in which one photovoltaic module is independently connected to the grid through an inverter, and cannot be applied to a photovoltaic power generation system in which a plurality of similar photovoltaic modules pass through the common AC side of the inverter, and thus in application. There are great limitations. Take a type 1 PV module as an example:

Referring to FIG. 1a, when one type 1 photovoltaic module PV1 is independently connected to the grid through the inverter, the PV1 anti-PID requirement is satisfied because the anode of the PV1 is grounded to ensure zero bias of the anode to ground;

However, when multiple Class 1 PV modules pass through the common AC side of the inverter, there is a certain risk in this method; as shown in Figure 1b, when the negative electrodes of Class 1 PV modules PV1.1 and PV1.2 are grounded, The output voltage of PV1.1 is higher than that of PV1.2, and a large circulating current CI is formed between the ground GND1 and GND2, which threatens the stability and reliability of the system.

In order to overcome the limitations of the prior art, the present invention particularly discloses an anti-PID photovoltaic power generation system, which comprises: a photovoltaic component, an inverter connected to the photovoltaic component, and one end grounded and the other end connected to the photovoltaic component The diode of the electrode. The anti-PID photovoltaic power generation system can directly utilize the unidirectional conductivity of the diode to block the circulation that may occur in the system, thereby ensuring the stability and reliability of the system; and simultaneously utilizing the unidirectional conductivity of the diode The ground potential of the photovoltaic module is clamped to a preset value (ignoring the tube voltage drop), thereby ensuring the anti-PID characteristic of the system, and solving the problems existing in the prior art.

In order to facilitate the understanding and implementation of the solution by those skilled in the art, the present invention is directed to a photovoltaic power generation system using 1, 2, 3, and 4 types of photovoltaic modules as power sources, and correspondingly disclosed in the first, second, third, and fourth embodiments. Class 1, 2, 3, and 4 anti-PID photovoltaic power generation systems. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the reality of the present invention All other embodiments obtained by a person of ordinary skill in the art without creative efforts are within the scope of the present invention.

Embodiment 1:

Referring to FIG. 2a, a class 1 anti-PID photovoltaic power generation system disclosed in the first embodiment includes: a type 1 photovoltaic module PV1, an inverter connected to a type 1 photovoltaic module PV1, and an anode grounded, cathode connected type 1 photovoltaic component. Diode VD of the negative pole of PV1.

According to the analysis, when a single type PV module PV1 equipped with a diode VD is independently connected to the grid through the inverter, since the VD anode is grounded, the VD will clamp the negative pole of the PV1 to the ground potential by using unidirectional conductivity. At this time, PV1 has good anti-PID characteristics due to the negative bias of the negative electrode to ground.

When a plurality of PV modules of the type 1 PV1 configured with a diode VD pass through the common AC side of the inverter, as shown in Fig. 2b (two types of PV modules PV1.1 and 1 with diode VD1 and diode VD2 respectively configured) Photovoltaic module PV1.2 is taken as an example. When the output voltage of PV1.1 is higher than PV1.2, the unidirectional conductivity of VD2 blocks the circulating current CI formed between the ground GND1 and the ground GND2; meanwhile, due to the VD1 anode Grounded and in the on state, VD1 can use the unidirectional conductivity to clamp the negative pole of PV1.1 to the ground zero potential, that is, the negative pole of PV1.1 is biased to ground zero; since the VD2 anode is grounded and is in the off state, Therefore, VD2 can use unidirectional conductivity to raise the negative electrode of PV1.2 to the forward voltage to ground, that is, the negative electrode of PV1.2 is positively biased to ground; at this time, PV1.1 and PV1.2 do not meet the ground due to the negative electrode. The negative bias requires good anti-PID characteristics.

Preferably, referring to FIG. 3a, in order to limit the short-circuit current when the PV1 positive electrode of the first-type photovoltaic module is short-circuited to the ground, the class 1 anti-PID photovoltaic power generation system shown in FIG. 2a may further include: connecting the negative electrode of the PV1 and the cathode of the VD. Resistor R; at this time, PV1 still maintains the negative-to-ground zero bias state.

Correspondingly, referring to FIG. 3b, the class 1 anti-PID photovoltaic power generation system shown in FIG. 2b further includes: a resistor R1 connected between PV1.1 and VD1 and a resistor R2 connected between PV1.2 and VD2; PV1.1 still maintains the negative-to-ground zero-bias state, and PV1.2 still maintains the negative-to-ground positive bias state.

Preferably, referring to FIG. 4a, in order to perform discharge recovery on the type 1 photovoltaic module PV1 with induced potential attenuation, the class 1 anti-PID photovoltaic power generation system shown in FIG. 2a may further include: a positive electrode connected to the negative electrode of PV1 and a negative electrode connected to VD. The voltage source U _{S of the} cathode; at this time, the PV1 cathode is positively biased to ground.

Correspondingly, referring to FIG. 4b, the type 1 anti-PID photovoltaic power generation system shown in FIG. 2b further includes: a negative electrode connected to the negative electrode of PV1.1, a voltage source U _S1 of the cathode connected to the negative electrode of VD1, and a negative electrode connected to the positive electrode of PV1.2. The negative electrode is connected to the voltage source U _S2 of the cathode of VD2; at this time, both PV1.1 and PV1.2 are positively biased to ground.

As can be seen from the above description, in the first embodiment, the cathode of the type 1 photovoltaic module is connected to the cathode of the diode, and the anode of the diode is grounded, and a plurality of type 1 photovoltaic modules configured with the diode are commonly communicated through the inverter. On the side, the diode can be disconnected from the circulating current due to the unidirectional conductivity, and the negative electrode of the Class 1 photovoltaic module with a higher output voltage is clamped to the zero potential of the ground, and the negative electrode of the type 1 photovoltaic module with a lower output voltage is lifted. It is a forward voltage to ground, thus ensuring the system's stable reliability and anti-PID characteristics.

Embodiment 2:

Referring to FIG. 5a, a type 2 anti-PID photovoltaic power generation system disclosed in the second embodiment includes: a type 2 photovoltaic module PV2, an inverter connected to a type 2 photovoltaic module PV2, and an anode grounding and cathode connection type 2 photovoltaic module. Diode VD of the anode of PV2.

When a single type of PV module PV2 configured with a diode VD is independently connected to the grid through an inverter, the presence of VD causes the PV2 anode to be zero biased to ground.

When multiple PV modules of type 2 PV2 with diode VD are connected through the common AC side of the inverter, as shown in Figure 5b (two types of PV modules PV2.1 and 2 with diode VD1 and diode VD2 respectively configured) Photovoltaic module PV2.2 is taken as an example. When the output voltage of PV2.1 is higher than PV2.2, the presence of VD1 and VD2 can cut off the circulating current and make the positive electrode of PV2.1 positively biased to ground, and the positive electrode of PV2.2. Ground zero bias.

Preferably, referring to FIG. 6a, in order to limit the short-circuit current when the second-type photovoltaic module PV2 anode is short-circuited to the ground, the class 2 anti-PID photovoltaic power generation system shown in FIG. 5a further includes: a cathode connected between the cathode of the PV2 and the cathode of the VD. Resistor R; at this time, PV2 maintains a positive-to-ground zero bias state. Correspondingly, referring to FIG. 6b, the type 2 anti-PID photovoltaic power generation system shown in FIG. 5b further includes: a resistor R1 connected between PV2.1 and VD1 and a resistor R2 connected between PV2.2 and VD2; PV2.1 maintains the positive pole to ground positive bias state, and PV2.2 maintains the positive pole to ground zero bias state.

Preferably, referring to FIG. 7a, in order to perform discharge recovery on the type 2 photovoltaic module PV2 with induced potential attenuation, the class 2 anti-PID photovoltaic power generation system shown in FIG. 5a may further include: a positive electrode connected to the positive electrode of the PV2 and a negative electrode connected to the VD. The voltage source U _{S of the} cathode; at this time, the positive electrode of PV2 is positively biased to ground. Correspondingly, referring to FIG. 7b, the type 2 anti-PID photovoltaic power generation system shown in FIG. 5b further includes: a positive electrode connected to the positive electrode of PV2.1, a negative electrode connected to the cathode of VD1, a voltage source U _S1 , and a positive electrode connected to the positive electrode of PV2.2. The negative electrode is connected to the voltage source U _S2 of the cathode of VD2; at this time, PV2.1 and PV2.2 are still positively biased to ground.

As can be seen from the above description, in the second embodiment, the cathode of the type 2 photovoltaic module is connected to the cathode of the diode, and the anode of the diode is grounded, and when a plurality of types of photovoltaic modules configured with the diode are connected through the inverter. On the side, because the diode has unidirectional conductivity, the current can be disconnected, and the positive electrode of the 2 types of photovoltaic modules with lower output voltage is clamped to the ground potential zero, and the positive electrode of the 2 types of photovoltaic modules with lower output voltage is raised. It is a forward voltage to ground, thus ensuring the system's stable reliability and anti-PID characteristics. It should be noted that the solution in the second embodiment is consistent with the principle of the first embodiment, so the description is relatively simple, and the relevant points can be referred to each other.

Embodiment 3:

Referring to FIG. 8a, a three-type anti-PID photovoltaic power generation system disclosed in the third embodiment includes: a PV module of the third type, a PV3, an inverter connected to the PV module of the third type, and a cathode of the third type. Diode VD of the negative electrode of PV3.

The analysis shows that when a single type of PV module PV3 equipped with a diode VD is independently connected to the grid through the inverter, since the VD cathode is grounded, the VD will clamp the negative pole of the PV3 to the ground potential by using unidirectional conductivity. At this time, PV3 has good anti-PID characteristics due to the negative bias of the negative electrode to ground.

When multiple PV modules of the type 3 PV3 configured with diode VD pass through the common AC side of the inverter, as shown in Figure 8b (with two types of PV modules PV3.1 and 3, respectively configured with diode VD1 and diode VD2) PV3.2 is taken as an example. When the output voltage of PV3.1 is higher than PV3.2, the unidirectional conductivity of VD1 and VD2 makes it impossible to form a circulating current CI between the ground GND1 and the ground GND2. VD1 cathode is grounded and is in the off state. Therefore, VD1 can pull the negative pole of PV3.1 to the ground reverse potential by unidirectional conductivity, that is, the negative pole of PV3.1 is negatively biased to ground, because the VD2 cathode is grounded and is conducting. State, therefore VD2 can use unidirectional conductivity to clamp the negative pole of PV3.2 to ground zero potential, that is, the negative pole of PV3.2 is biased to ground zero; at this time, PV3.1 and PV3.2 meet the negative pole to ground It has good anti-PID characteristics without the requirement of positive bias.

Preferably, referring to FIG. 9a, in order to limit the short-circuit current when the third-type photovoltaic module PV3 positive electrode is short-circuited to the ground, the class 3 anti-PID photovoltaic power generation system shown in FIG. 8a may further include: a negative electrode connected to the PV3 and The resistance R between the anodes of the diodes VD; at this time, the PV3 still maintains the negative-to-ground zero bias state.

Correspondingly, referring to FIG. 9b, the class 3 anti-PID photovoltaic power generation system shown in FIG. 8b further includes: a resistor R1 connected between PV3.1 and VD1 and a resistor R2 connected between PV3.2 and VD2; PV3.1 still maintains the negative bias state of the negative pole to ground, and PV3.2 maintains the negative bias state of the negative pole to ground.

Preferably, referring to FIG. 10a, in order to perform discharge recovery on the type 3 photovoltaic module PV3 with induced potential attenuation, the class 3 anti-PID photovoltaic power generation system shown in FIG. 8a may further include: a negative electrode connected to the negative electrode of the PV3 and a positive electrode connected to the VD. The voltage source U _{S of the} anode; at this time, the negative electrode of PV3 is negatively biased to ground.

Correspondingly, referring to FIG. 10b, the three types of anti-PID photovoltaic power generation system shown in FIG. 8b further includes: a negative electrode connected to the anode of PV3.1, a voltage source U _S1 of the anode of the positive electrode connected to the diode VD1, and a negative electrode of the negative electrode connected to the PV3.2. The positive electrode is connected to the voltage source U _S2 of the anode of the diode VD2; at this time, both PV3.1 and PV3.2 are negatively biased to the ground.

It can be seen from the above description that in the third embodiment, the anode of the three types of photovoltaic modules is connected to the anode of the diode, and the cathode of the diode is grounded, and the three types of photovoltaic modules configured with the diodes are commonly communicated through the inverter. On the side, because the diode has unidirectional conductivity, the current can be disconnected, and the negative electrode of the third-type PV module with higher output voltage is pulled down to the reverse voltage of the ground, and the negative electrode of the three types of photovoltaic modules with lower output voltage is clamped. The ground potential is zero, thus ensuring the system's stable reliability and anti-PID characteristics.

Embodiment 4:

Referring to FIG. 11a, a four-type anti-PID photovoltaic power generation system disclosed in the fourth embodiment includes: a PV module of the fourth type, a PV4, an inverter connected to the PV module of the fourth type, and a cathode of the fourth type. Diode VD of the anode of PV4.

The analysis shows that when a single type of PV module PV4 equipped with a diode VD is independently connected to the grid through the inverter, the presence of VD causes the PV4 anode to be zero biased to ground.

When a plurality of PV modules of the type 4 PV4 configured with a diode VD pass through the common AC side of the inverter, as shown in FIG. 11b (two types of PV modules PV4.1 and 4, respectively configured with diode VD1 and diode VD2) Photovoltaic module PV4.2 is taken as an example. When the output voltage of PV4.1 is higher than PV4.2, the presence of VD1 and VD2 can block the circulating current and clamp the positive electrode of PV4.1 to zero potential to ground, and PV4. The positive pole of 2 is pulled down to the ground potential.

Preferably, referring to FIG. 12a, in order to limit the short-circuit current when the negative electrode of the photovoltaic module PV4 is short-circuited to the ground, the class 4 anti-PID photovoltaic power generation system shown in FIG. 11a may further include: connecting between the positive electrode of the PV4 and the anode of the diode VD. Resistor R; at this time, PV4 still maintains a positive-to-ground zero bias state. Correspondingly, referring to FIG. 12b, the four types of anti-PID photovoltaic power generation system shown in FIG. 11b further includes: a resistor R1 connected between PV4.1 and VD1 and a resistor R2 connected between PV4.2 and VD2; PV4.1 still maintains the positive-to-ground zero-bias state, and PV4.2 still maintains the positive-to-ground negative bias state.

Preferably, referring to FIG. 13a, in order to perform discharge recovery on the PV module PV4 with induced potential attenuation, the Class 4 anti-PID photovoltaic power generation system shown in FIG. 11a may further include: a cathode connected to the anode of the negative electrode and an anode connected to the VD of the positive electrode. Voltage source U _S ; at this time, the negative electrode of PV4 is negatively biased to ground. Correspondingly, referring to FIG. 13b, the four types of anti-PID photovoltaic power generation system shown in FIG. 11b further includes: a positive electrode connected to the positive electrode of PV4.1, a positive electrode connected to the anode of the diode VD1, a voltage source U _S1 , and a positive electrode connected to the positive electrode of the PV4.2. The positive electrode is connected to the voltage source U _S2 of the anode of the diode VD2; at this time, both PV4.1 and PV4.2 are negatively biased to the ground.

As can be seen from the above description, in the fourth embodiment, the anode of the four types of photovoltaic modules is connected to the anode of the diode, and the cathode of the diode is grounded, and the plurality of types of photovoltaic modules configured with the diodes are commonly communicated through the inverter. On the side, the diode has unidirectional conductivity to disconnect the loop, and the anode of the 4 types of PV modules with lower output voltage is pulled down to the reverse voltage of the ground, and the positive pole of the 4 types of PV modules with higher output voltage is clamped. The ground potential is zero, thus ensuring the system's stable reliability and anti-PID characteristics. It should be noted that the solution in the fourth embodiment is consistent with the principle of the third embodiment, so the description is relatively simple, and the relevant points can be referred to each other.

In addition, the present invention also discloses an anti-PID photovoltaic component, comprising a photovoltaic component and a diode with one end grounded and the other end connected to the electrode of the photovoltaic component; and an anti-PID inverter including an inverter and one end grounded, The other end is connected to the diode of the power supply input of the inverter. The photovoltaic power generation system using the anti-PID photovoltaic module or the anti-PID inverter has good stability reliability and anti-PID characteristics, and its working principle is consistent with the anti-PID photovoltaic power generation system disclosed in the present invention, and is no longer here. One by one.

In summary, the present invention connects the existing photovoltaic module to the ground through the diode, and utilizes the one-way of the diode. Conductivity blocks the circulation that may occur in the photovoltaic power generation system, ensuring the stability and reliability of the system. At the same time, the unidirectional conductivity of the diode is used to clamp the ground potential of the PV module to a preset value, which ensures the anti-PID of the system. characteristic. In addition, based on the above solution, the present invention can also add some auxiliary electronic devices between the photovoltaic module and the diode to achieve additional beneficial effects, such as resistance for limiting the short-circuit current when the photovoltaic module is short-circuited to the ground, for the existing potential. The voltage source for inducing the attenuation of the photovoltaic module for discharge recovery, the DC fuse for preventing the photovoltaic module from short-circuiting to the ground, or the current sensor for detecting the leakage current of the photovoltaic module to the ground, and the like are not limited.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the embodiments of the invention. . Therefore, the embodiments of the present invention are not limited to the embodiments shown in the drawings, but the broadest scope consistent with the principles and novel features disclosed herein.

Claims

An anti-potential induced-induced attenuation PID photovoltaic power generation system comprising a photovoltaic component and an inverter connected to the photovoltaic component, further comprising: a diode having one end grounded and the other end connected to an electrode of the photovoltaic component.
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic component is a photovoltaic component that requires the negative electrode to have no negative bias to the ground, the diode anode is grounded and the cathode is connected to the negative electrode of the photovoltaic component. .
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic component is a photovoltaic component that does not have a negative bias voltage from the positive electrode to the ground, the diode anode is grounded and the cathode is connected to the positive electrode of the photovoltaic component. .
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic component is a photovoltaic component that requires the anode to be non-positively biased to the ground, the diode cathode is grounded and the anode is connected to the anode of the photovoltaic module. .
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic component is a photovoltaic component that does not have a positive bias to the ground, the diode cathode is grounded and the anode is connected to the positive electrode of the photovoltaic component. .
The anti-PID photovoltaic power generation system according to claim 1, further comprising: a resistor connected between the electrode of the photovoltaic module and the diode, or a resistor connected between the diode and the ground.
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic module is a photovoltaic module that requires the negative electrode to have no negative bias to the ground, the method further includes: connecting the negative electrode to the negative electrode and the negative electrode of the photovoltaic module. The voltage source of the cathode of the diode, or the positive electrode is connected to the voltage source of the anode of the diode and the ground of the negative pole.
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic component is a photovoltaic component that does not have a negative bias voltage to the ground, the positive electrode is connected to the positive electrode and the negative electrode of the photovoltaic component. The voltage source of the cathode of the diode, or the positive electrode is connected to the voltage source of the anode of the diode and the ground of the negative pole.
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic module is a photovoltaic module that does not have a positive bias to the ground, the negative electrode is connected to the photovoltaic group. The negative electrode of the piece, the positive electrode is connected to the voltage source of the anode of the diode, or the negative electrode is connected to the cathode of the diode and the voltage source of the positive electrode to the ground.
The anti-PID photovoltaic power generation system according to claim 1, wherein when the photovoltaic component is a photovoltaic component that does not have a positive bias to the ground, the negative electrode is connected to the positive electrode and the positive electrode of the photovoltaic component. A voltage source of the anode of the diode, or a voltage source whose anode is connected to the cathode of the diode and the anode is grounded.
An anti-PID photovoltaic component, comprising a photovoltaic component, characterized by further comprising: a diode having one end grounded and the other end connected to an electrode of the photovoltaic component.
An anti-PID inverter includes an inverter, and further includes: a diode having one end grounded and the other end connected to a power input end of the inverter.