Optical storage system with PID (Proportion Integration Differentiation) repairing function

Abstract

The utility model relates to the technical field of photovoltaic power generation and energy storage systems, in particular to an optical storage system with a PID (Proportion Integration Differentiation) repair function. An MPPT controller; the load or the energy storage equipment is configured to be equipment which takes the output electric energy of the MPPT controller as power supply input; the controllable change-over switch is connected in series in an output loop of the MPPT controller; and the PID module is used for carrying out PID repair on the photovoltaic string, and when the PID module needs to be started to carry out photovoltaic string repair, the controllable change-over switch is controlled to be switched off. By disconnecting the controllable change-over switch, the connection between the photovoltaic group string and the system ground wire is effectively isolated in the PID repair process, and a short-circuit-to-ground loop formed by grounding of the alternating current N wire of the load or the energy storage equipment is prevented. According to the design, the correctness of a current path in the PID repair process is ensured, current overload and equipment damage are avoided, the MPPT controller and other key hardware equipment are protected, the service life of the system is prolonged, and the safety and reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation and energy storage system technical field especially relates to a kind of maximum power point tracking (MPPT) control system with PID (Potential Induced Degradation, Potential Induced Degradation) repair function, it is applicable to the technical scheme for improving power generation efficiency and system reliability in photovoltaic power generation system. BACKGROUND

[0002] With the widespread application of renewable energy, photovoltaic power generation system is widely promoted in the world due to its clean and efficient characteristics. However, photovoltaic module string running in long-term high-voltage and high-humidity environment is prone to PID effect, i.e. Potential Induced Degradation phenomenon, which leads to significant decline in power generation efficiency of photovoltaic module and affects performance and economy of the whole photovoltaic system.

[0003] In order to solve the problem of power generation efficiency decline caused by PID effect, researchers have proposed various PID repair methods. The existing document one (CN118508511B) discloses a PID effect repair circuit and control method based on photovoltaic converter. This method realizes the switching of system operating state by setting switching switches and isolation current limiting resistors between photovoltaic module and converter. When performing PID repair, the switching switch conducts a specific branch, so that the DC side of the converter applies high voltage to the photovoltaic module to repair the PID effect. This method can realize smooth switching of grid-connected power generation and PID repair without changing the existing system architecture.

[0004] However, the existing method has the following shortcomings in actual application:

[0005] 1. Increased hardware complexity: The introduction of multiple switching switches and isolation current limiting resistors increases the hardware complexity of the system, which may lead to cost increase and system reliability decline.

[0006] 2. Complex control strategy: Different operating states require switching of control strategy, which increases the complexity of system control and puts higher requirements on the performance of the controller.

[0007] 3. Energy loss: Energy loss may occur during switching process, affecting the overall efficiency of the system.

[0008] 4. Ground short circuit problem: the prior art does not fully consider that in the case of AC N line grounding of the load or energy storage device, the inventor finds that a ground short circuit loop is formed in the PID repair process. This ground short circuit loop can cause the key hardware devices (such as the MPPT controller) in the system to overload, and even be damaged, thereby reducing the overall reliability and service life of the system. Utility model content

[0009] The utility model aims at providing a light storage system with PID repair function aiming at the shortage of prior art, which aims at optimizing the hardware structure and control strategy, simplifying the system design, reducing the cost, and improving the reliability and efficiency of the system.

[0010] The utility model realizes the above-mentioned purpose through the following technical scheme: a light storage system with PID repair function, comprising:

[0011] Photovoltaic group string, for converting light energy into electric energy;

[0012] MPPT controller, for maximum power point tracking of photovoltaic group string;

[0013] Load or energy storage device, configured as a device using the output electric energy of the MPPT controller as power input;

[0014] Controllable switch, connected in series in the output loop of the MPPT controller, for controlling the conduction and disconnection between the MPPT controller and the load or energy storage device;

[0015] PID module, for PID repair of photovoltaic group string;

[0016] When it is necessary to start the PID module to repair the photovoltaic group string, the MPPT controller controls the controllable switch to be disconnected.

[0017] As a further scheme of the utility model: the MPPT controller comprises a DC / DC conversion circuit, for converting the input direct current electric energy, and outputting the voltage and current matched with the load or energy storage device to the direct current bus under the action of the control signal, and sharing the direct current bus with the PID module, the controllable switch and the load or energy storage device.

[0018] As a further scheme of the utility model: the load or energy storage device is a direct current system or a power grid system, for using the direct current output of the MPPT controller as direct current power input.

[0019] As a further scheme of the utility model: the controllable switch is a semiconductor device or other controllable switch that can be turned on and off.

[0020] As a further scheme of the utility model: the PID module is used for taking electricity from the DC bus of the DC system, and provides a forward bias voltage to the positive pole or the negative pole of the photovoltaic module string, so as to realize the repair of the PID effect.

[0021] As a further scheme of the utility model: the load or the energy storage device is also used for keeping power supply when the photovoltaic module string has no electricity at night.

[0022] As a further scheme of the utility model: the system also comprises a control module built in the MPPT controller, which is used for disconnecting the controllable switch and triggering the PID module to repair the photovoltaic module string.

[0023] As a further scheme of the utility model: the controllable switch is connected with the PID module and the load or the energy storage device respectively, and the PID module is also connected with the photovoltaic module string.

[0024] It needs to be supplemented that, through repeated research of the present case, it is found that in the traditional PID repair method, especially based on the design of the prior art one, if the AC N line of the load or the energy storage device is grounded, and the switch is closed in the PID repair process, the applied forward bias voltage may form a short circuit loop to the ground through the grounding path.

[0025] 1. Current overload: the additional current in the ground loop may exceed the rated current of the system components, causing overload.

[0026] 2. Equipment damage: the overload current may cause overheating, burning or functional failure of the MPPT controller and other connected devices.

[0027] 3. System instability: the existence of the ground loop may interfere with the normal operation of the system, causing voltage fluctuations and instability.

[0028] 4. Safety hazard: the formation of the ground short circuit loop may cause electrical safety problems such as short circuit, fire, etc., threatening the safety of personnel and equipment.

[0029] Compared with the prior art one, the utility model has the beneficial effects:

[0030] 1. Simplification of hardware structure: this scheme only needs to add a controllable switch in the output loop of the MPPT controller, reduces the introduction of additional elements (such as isolation current limiting resistor and multiple switches), reduces the hardware complexity and manufacturing cost of the system, and improves the reliability of the system.

[0031] 2. Control strategy simplification: By disconnecting the controllable switch before PID repair, the complex state switching control strategy is avoided, making the system control more simple and efficient, reducing the requirements for controller performance, and improving the overall stability of the system.

[0032] 3. Avoiding ground short circuit loop: By disconnecting the controllable switch, the connection between the photovoltaic string and the system ground is effectively isolated during the PID repair process, preventing the formation of a ground short circuit loop due to the AC N line grounding of the load or energy storage device, protecting the MPPT controller and other key hardware devices, prolonging the service life of the system, and ensuring the safe operation of the system.

[0033] 4. Reduce energy loss: Disconnect the controllable switch during PID repair to avoid unnecessary current flow, thereby reducing energy loss and improving the overall energy efficiency of the system.

[0034] 5. System protection enhancement: By disconnecting the switch, the formation of a ground loop caused by the AC side N line grounding is prevented, protecting the MPPT controller and other connected devices in the system, prolonging the service life of the system, and ensuring the safety of the system.

[0035] 6. Continuous power supply capability improvement: The design of the direct current system ensures that even in the absence of power from the photovoltaic string, the system can still provide stable power through the energy storage device, ensuring the continuous power demand of the household or load, and improving the practicality and reliability of the system.

[0036] 7. Efficient PID repair: The PID module can efficiently take power from the DC bus of the direct current system and apply a forward bias voltage to the positive or negative pole of the photovoltaic string, achieving precise and efficient PID repair, restoring the power generation capacity of the photovoltaic string, and ensuring long-term stable operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A structural connection diagram of the utility model.

[0038] Figure 2 For Figure 1 further refinement of the structural connection diagram.

[0039] Figure 3 PID repair work logic structure diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application. It can be understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for clear description, and does not limit the connection mode.

[0041] It should be noted that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0042] In related technologies, for example, existing document one (CN118508511B) discloses a PID effect repair circuit and control method based on a photovoltaic converter. The method realizes the switching of the system operating state by setting switching switches and isolation current limiting resistors between the photovoltaic module and the converter. When performing PID repair, the switching switch conducts a specific branch, and the DC side of the converter applies high voltage to the photovoltaic module to repair the PID effect. The method can realize smooth switching of grid-connected power generation and PID repair without changing the existing system architecture.

[0043] However, the existing method has the following deficiencies in actual application:

[0044] 1. Increased hardware complexity: The introduction of multiple switching switches and isolation current limiting resistors increases the hardware complexity of the system, which may lead to increased cost and decreased system reliability.

[0045] 2. Complex control strategy: Different operating state switching control strategies are required, increasing the complexity of system control and placing higher demands on the performance of the controller.

[0046] 3. Energy loss: Energy loss may occur during switching, affecting the overall efficiency of the system.

[0047] 4. Ground short circuit problem: The existing literature does not fully consider the case where the AC N line of the load or energy storage device is grounded. Through the research of the present inventor, it is found that a ground short circuit loop will be formed during the PID repair process. This ground short circuit loop can cause the key hardware devices (such as MPPT controllers) in the system to overload or even be damaged, thereby reducing the overall reliability and service life of the system.

[0048] It needs to be noted that through repeated research by the present inventor, it is found that in the traditional PID repair method, especially based on the design of the existing literature, when the AC N line of the load or energy storage device is grounded, if the switch is closed during the PID repair process, the positive bias voltage applied may form a ground short circuit loop through the ground path. This short circuit loop can cause the following problems:

[0049] 1. Current overload: The additional current in the ground loop may exceed the rated current of the system components, causing overload.

[0050] 2. Device damage: Overload current can cause overheating, burning or functional failure of the MPPT controller and other connected devices.

[0051] 3. System instability: The presence of a ground loop can interfere with the normal operation of the system, causing voltage fluctuations and instability.

[0052] 4. Safety hazards: The formation of a ground short circuit loop can cause electrical safety problems such as short circuits, fires, etc., threatening the safety of personnel and equipment.

[0053] Therefore, the embodiments of the present application provide a photovoltaic energy storage system with PID repair function, which can avoid the ground short circuit loop caused by the grounding of the AC N line of the load or energy storage device by adding a controllable switch in the output loop of the MPPT controller and disconnecting the switch before PID repair, preventing damage to the system hardware. At the same time, the PID module takes power from the DC bus of the DC system to provide a positive bias voltage for the positive or negative pole of the photovoltaic string, repair the PID effect, and ensure efficient and reliable operation of the system.

[0054] As shown in Figures 1-3 The photovoltaic energy storage system with PID repair function provided in the embodiments of the present application includes the following main components:

[0055] Photovoltaic string 1: used to convert light energy into electrical energy and output DC power.

[0056] MPPT controller 2: as a DC / DC converter, receives the output power of photovoltaic string 1, realizes maximum power point tracking, and delivers power to load or energy storage device 5 through controllable switch 3, and shares the DC bus with PID module 4.

[0057] Controllable switch 3: connected in series in the output loop of MPPT controller 2, can control on and off according to the PID repair needs.

[0058] PID module 4: used for detecting and repairing PID effect. When it is needed to start the PID module to repair the photovoltaic string, the control module MCU of MPPT controller 2 controls the controllable switch 3 to open, to cut off the connection between the load or energy storage device 5 and the photovoltaic string 1, to avoid forming a loop to ground in the repair process.

[0059] DC system 5: including energy storage devices (such as batteries) or power grid, can still provide power when the photovoltaic string 1 is without electricity at night, to ensure the continuous operation and stability of the system.

[0060] Workflow

[0061] 1. Normal operation mode:

[0062] The photovoltaic string 1 works under sunlight, converts light energy into electrical energy;

[0063] The MPPT controller 2 performs maximum power point tracking on the output of the photovoltaic string 1, and the power flows to the load or energy storage device 5 through the controllable switch 3, and is stored in the DC system 5.

[0064] 2. PID repair mode:

[0065] When the PID module 4 detects that the photovoltaic string 1 has PID effect, it needs to be repaired;

[0066] The control module MCU of MPPT controller 2 controls the controllable switch 3 to open, to cut off the connection between the MPPT controller 2 and the load or energy storage device 5, and then cut off the connection between the photovoltaic string 1 and the load or energy storage device 5 (that is, cut off the connection between the photovoltaic string 1 and the DC system 5), to avoid forming a loop to ground in the repair process;

[0067] The PID module 4 takes power from the DC bus of the DC system 5, and applies a forward bias voltage to the positive or negative electrode of the photovoltaic string 1, to repair the PID effect;

[0068] After the PID repair is completed, the control module MCU of MPPT controller 2 controls the controllable switch 3 to close again, to restore the normal operation mode.

[0069] It is worth mentioning that the inventor has found that the ground loop in the traditional PID repair method is caused by the following reasons: In the traditional PID (Potential Induced Degradation) repair method, the PID effect is usually eliminated by applying a forward bias voltage to the positive or negative electrode of the photovoltaic panel. However, in many photovoltaic systems, the neutral line N on the AC side is already grounded. When a forward bias voltage is applied, current not only flows between the photovoltaic panel and the controller, but also may return through the ground path, forming a ground loop. The specific reasons are as follows:

[0070] 1. Circuit connection structure: A photovoltaic system usually contains components such as photovoltaic strings, MPPT controllers, loads or energy storage devices, etc. In grid-connected operation mode, the output of the MPPT controller is grounded through the neutral line N, forming a closed loop with the power grid.

[0071] 2. Apply forward bias voltage: When the PID repair module applies a forward bias voltage, a return path is required for the voltage source. Since the neutral line N is already grounded, the return path of the bias voltage may form a closed loop through the ground.

[0072] 3. Formation of ground loop: The forward bias voltage returns through the ground, forming a ground loop between the photovoltaic panel, the MPPT controller and the ground.

[0073] Problems caused by the ground loop: The formation of the ground loop can cause a series of problems, including: 1. Current overload: The ground loop may cause additional current to flow through the MPPT controller and other connected devices. These devices are usually not designed to withstand high current and may be damaged by overload. 2. Device damage: Excessive current can cause the MPPT controller, switching devices and other electronic components to overheat, reducing their service life and even causing device failure or burning. 3. System instability: The ground loop can interfere with the normal operation of the system, causing voltage fluctuations and instability, affecting the overall performance and power generation efficiency of the photovoltaic system. 4. Safety hazards: The formation of the ground loop may cause electrical safety problems such as electrical short circuit, fire, etc., threatening the safety of personnel and equipment.

[0074] This scheme can effectively avoid the formation of the ground loop. In order to effectively avoid the formation of the ground loop during the PID repair process, this scheme introduces a controllable switching switch, which realizes the protection of the ground loop in the following way:

[0075] 1. Introduce a controllable switching switch: A controllable switching switch 3 is connected in series in the output loop of the MPPT controller 1. The controllable switching switch 3 can control the conduction and disconnection between the MPPT controller 1 and the load / energy storage device 5 according to the PID repair requirements.

[0076] 2. Disconnection of the switching switch before PID repair: When the PID module 4 detects that PID repair is needed, it first controls the switching controllable switch 3 to be disconnected. After the controllable switching switch 3 is disconnected, the connection between the photovoltaic string 1 and the load or energy storage device 5 is cut off, thereby isolating the connection between the photovoltaic string 1 and the system ground. Among them, the photovoltaic string and the MPPT controller are kept connected, and the load or energy storage device 5 is disconnected, which will form a short circuit loop through the AC when they are AC side N line grounded.

[0077] 3. Preventing the formation of a ground loop: Since the controllable switching switch 3 has been disconnected, when the PID module 4 applies a forward bias voltage, the current can only flow within the photovoltaic string 1 and cannot return through the ground. In this way, even if a forward bias voltage is applied, the current path is strictly limited within the photovoltaic string 1, avoiding the formation of a ground loop through the ground.

[0078] 4. Safe PID repair: In the state of disconnecting the switching controllable switch 3, the PID module 4 applies a forward bias voltage to the positive or negative electrode of the photovoltaic string 1, effectively repairing the PID effect. Since the ground loop is blocked, other parts of the system do not need to bear additional current load, protecting the MPPT controller 1 and other devices from damage.

[0079] 5. Resume normal operation: After the PID repair is completed, the PID module 4 controls the switching controllable switch 3 to be closed again, restoring the normal connection between the photovoltaic string 1 and the load or energy storage device 5, and the system returns to normal power generation mode.

[0080] Through the above analysis, it can be clearly seen that the present scheme can effectively solve the problem of the ground loop in the traditional PID repair method, specifically:

[0081] Introduction of controllable switching switch: 1. Solving the problem of hardware complexity, compared with the existing literature, which requires multiple switching switches and isolation current limiting resistors, the present scheme only adds one controllable switching switch, simplifying the hardware structure and reducing the system complexity and cost. 2. Preventing the formation of a ground loop, by disconnecting the switching switch before PID repair, the connection between the photovoltaic string 1 and the system ground is directly isolated, effectively preventing the formation of a ground loop and protecting the system hardware.

[0082] Design of PID module 4: 1. Simplify the control strategy. The PID module 4 realizes the switching of the system mode through simple switch control, avoiding complex control strategies and improving the stability and reliability of the system. 2. Ensure safe repair, the PID module 4 applies a forward bias voltage in the state of disconnecting the switch, ensuring that the current path is limited only within the photovoltaic string 1, avoiding current overload and device damage caused by the ground loop.

[0083] Configuration of the DC system: 1. Improve system protection, the DC system not only stores the output of the MPPT controller 1, but also provides stable power supply during the PID repair process, ensuring that the PID module 4 has reliable power support, further improving the protection capability of the system. 2. Enhance the ability of continuous power supply, the DC system ensures that even when the photovoltaic string 1 has no power, the system can still provide stable power through the energy storage device, ensuring the continuity and stability of the system.

[0084] By introducing a controllable switching switch in the output loop of the MPPT controller 1 and disconnecting the switch before PID repair, this scheme effectively isolates the connection between the photovoltaic string 1 and the system ground, thereby avoiding the formation of a ground loop. This design not only protects the MPPT controller 1 and other devices in the system, preventing current overload and hardware damage caused by the ground loop, but also simplifies the hardware structure and control strategy of the system, improving the overall reliability and efficiency of the system. Therefore, this scheme effectively solves the problems of hardware complexity, complex control strategy and energy loss in the traditional PID repair method, and has significant technical advantages and practical value.

[0085] On the other hand, this scheme:

[0086] 1. Introduction of controllable switching switch 3:

[0087] A controllable switching switch 3 is connected in series in the output loop of the MPPT controller 2, so that the circuit can be disconnected before PID repair, avoiding the formation of a ground loop due to the grounding of the AC side N line, thereby preventing damage to the system hardware. The switch is controlled by the MCU chip of the MPPT controller 2, realizing fast and accurate switching operation, and ensuring stable switching of the system in different operating modes.

[0088] 2. Design of PID module 4:

[0089] The PID module 4 takes power from the DC bus of the DC system 5, ensuring stable power supply during PID repair;

[0090] By providing a positive bias voltage to the positive or negative pole of the photovoltaic string 1, the PID effect is repaired and the power generation capacity of the photovoltaic string is restored.

[0091] 3. Configuration of the DC system 5:

[0092] The DC system 5 not only stores the DC output of the MPPT controller 2, but also continues to supply power when the photovoltaic string 1 has no power at night, ensuring the continuous operation and stability of the system. The DC system can include energy storage devices such as batteries.

[0093] 4. Role of control module 7:

[0094] The control module 7 is controlled by the MCU chip of the MPPT controller 2, and is responsible for disconnecting the controllable switch 3 and triggering the repair operation of the PID module 5 when it is necessary to start the PID module for repairing the photovoltaic string, so as to ensure that the system is switched to the PID repair mode safely and efficiently during the repair process.

[0095] The present scheme solves the technical problems in the prior art by the following ways:

[0096] 1. Simplification of hardware structure: Compared with the prior art document 1 which requires multiple switches and isolation current limiting resistors, the present scheme only adds a controllable switch in the output circuit of the MPPT controller, reduces the introduction of additional elements, reduces the complexity and cost of the system, and improves the reliability of the system.

[0097] 2. Simplification of control strategy: by disconnecting the controllable switch before PID repair, the complex state switching control strategy is avoided, the system control is more simple and efficient, the requirement for the performance of the controller is reduced, and the overall stability of the system is improved.

[0098] 3. Reduce energy loss: disconnect the controllable switch during PID repair to avoid unnecessary current flow, thereby reducing energy loss and improving the overall energy efficiency of the system.

[0099] 4. Enhanced system protection: by disconnecting the switch, the formation of the ground return loop caused by the grounding of the N line on the AC side is prevented, the MPPT controller and other connected devices in the system are protected, the service life of the system is prolonged, and the safety of the system is ensured.

[0100] 5. Improved continuous power supply capability: the design of the direct current system 5 ensures that even when the photovoltaic string 1 has no power, the system can still provide stable power through the energy storage device, ensuring the continuous power demand of the household or load, and improving the practicality and reliability of the system.

[0101] In summary, the present scheme optimizes the hardware structure and simplifies the control strategy, effectively solves the problems of hardware complexity, complex control strategy and energy loss in the existing PID repair method, and at the same time enhances the protection capability and continuous power supply capability of the system, significantly improves the reliability and efficiency of the photovoltaic power generation system.

[0102] In the specification and claims of the present application, the words "comprise / contain" and the words "have / including" and their variants are used to specify the presence of the stated features, values, steps or components, but do not exclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0103] For the sake of clarity, some features of the present application are described in different embodiments, however, these features can also be combined in a single embodiment. Conversely, some features of the present application, for the sake of brevity, are described in a single embodiment, however, these features can also be described in different embodiments, alone or in any suitable combination.

[0104] Finally, it should be noted that: the skilled in the art will cross reference or superimposed each embodiment of the present application, still belongs to the original disclosure range of the present application. In addition, the above only for the preferred embodiments of the present application, and does not limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or the equivalent replacement of part of the technical features recorded in the foregoing embodiments, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A photostorage system with a PID repair function, characterized in that The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module.

2. The optical storage system with PID repair function according to claim 1, wherein, The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module.

3. The optical storage system with PID repair function according to claim 1, wherein, The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module.

4. The optical storage system with PID repair function according to claim 1, wherein, The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module.

5. The optical storage system with PID repair function according to claim 1, wherein, The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a photovoltaic module string, an MPPT controller, a load or energy storage device, a controllable switch and a PID module. The application relates to a phot

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