A protection method and device for a PCS charge-discharge equipment

Abstract

This invention belongs to the field of charging and discharging equipment, and discloses a protection method for PCS charging and discharging equipment, including: monitoring whether the environmental state of the PCS charging and discharging equipment changes; outputting a closed signal according to a charging and discharging start command, or outputting a disconnect signal according to a charging and discharging stop command; when the environmental state of the PCS charging and discharging equipment does not change and a closed signal is received, configuring a switch module to close so that the load module and the bus are connected through the switch module; when the environmental state of the PCS charging and discharging equipment changes or a disconnect signal is received, configuring a switch module to disconnect so that the load module and the bus are blocked by the switch module. The invention also discloses a protection device for the PCS charging and discharging equipment, including the monitoring module, software control module, and hardware control module as described above. This technical solution can prevent the energy storage converter PCS in the charging and discharging equipment from being damaged by load impacts under abnormal current conditions such as initial power-on, instantaneous abnormal power-off, and instantaneous increase in load.

Description

Technical Field

[0001] This invention relates to the field of charging and discharging equipment, and in particular to a protection method and apparatus for PCS charging and discharging equipment. Background Technology

[0002] Electricity, as a green new energy source, has become one of the public's preferred energy sources due to its environmentally friendly and pollution-free use and low economic burden. It enjoys widespread acceptance and usage among the public. With the increase in application scenarios and the launch of new electric products, it is constantly driving the development of electric energy storage technology and charging and discharging technology. In particular, in order to meet the high-power fast charging of new energy vehicles, charging and discharging equipment such as charging piles that can support high-power and high-voltage charging of vehicles have been developed.

[0003] Currently, charging and discharging equipment mainly consists of a power storage converter (PCS) for obtaining power from the grid, a high-voltage DC bus, and a DC / DC converter for connecting the charging gun. The PCS is the core component, which converts AC and DC power. In practical applications, to achieve a larger power output, charging and discharging equipment often connects multiple PCS and multiple DC / DC converters in parallel. The output side of the parallel PCS is connected to the high-voltage DC bus, and the input side of the parallel DC / DC converters is also connected to the high-voltage DC bus. The high-voltage DC bus acts as an intermediate component, transferring power from the PCS to the DC / DC converter, which then outputs the power to the product. Among these, the bidirectional PCS and DC / DC converters can transmit power back to the grid through product discharge.

[0004] Existing energy storage charging and discharging PCS systems suffer from performance differences even among PCS systems of the same brand due to varying manufacturer standards and quality control requirements. The performance gap is even wider between different brands, leading to internal electrical performance compatibility defects. These defects primarily manifest in the inability of the energy storage PCS to disconnect in a timely manner due to differences in the load-carrying and breaking capacities of its output relays. Furthermore, the parallel connection of different DC / DC converters on the high-voltage bus creates bus capacitance. During power-on or abnormal power-off processes, these bus capacitances become impact loads due to instantaneous high current and power, damaging both the energy storage charging / discharging PCS and the DC / DC converters. In other words, existing charging and discharging equipment is highly susceptible to damage during power-on, power-off, and sudden increases in load, exhibiting low durability and high maintenance costs. Summary of the Invention

[0005] The purpose of this invention is to provide a protection method and device for PCS charging and discharging equipment, so as to prevent the energy storage converter PCS in the charging and discharging equipment from being damaged by load impact under abnormal current conditions such as initial power-on, instantaneous abnormal power-off, and instantaneous increase in load.

[0006] The technical solution provided by this invention is: a protection method for a PCS charging and discharging device, comprising the following steps:

[0007] Monitor whether the environmental conditions of the PCS charging and discharging equipment have changed;

[0008] The switch module is configured to have two power-on states: normally open and detection, and it is determined whether the two power-on states are in a normal state. The two power-on states correspond to the power-on states of the software control module and the hardware control module, respectively.

[0009] When the hardware control module is in a normal power-on state, and the software control module receives a charge / discharge start command based on the fact that the environmental state of the PCS charging / discharging equipment has not changed, it triggers the PCS module to start so that the voltage value of the bus can be increased to a preset voltage value. Then, it configures the switch module to close so that the load module and the bus can be connected through the switch module. Finally, it outputs a disconnect signal according to the charge / discharge stop command.

[0010] When the hardware control module is in a normal power-on state, the software control module also configures the switch module to disconnect when the environmental state of the PCS charging and discharging equipment changes or when the disconnection signal is received, so that the load module and the bus are blocked by the switch module.

[0011] When the power-on state of the hardware control module is abnormal, the software control module is also used to output the first alarm information;

[0012] When the software control module is in a normal power-on state and the environmental conditions of the PCS charging and discharging equipment change, or when the software control module is in an abnormal power-on state, the hardware control module is used to configure the switch module to disconnect.

[0013] In the above-mentioned protection method for PCS charging and discharging equipment, the environmental state of the PCS charging and discharging equipment changes, including at least one abnormal signal among: access control abnormality monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring and input voltage abnormality monitoring;

[0014] The environmental conditions of the PCS charging and discharging equipment have not changed, including each normal signal in the following: access control anomaly monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring, and input voltage anomaly monitoring;

[0015] Configure the switch module according to the abnormal signal or the normal signal.

[0016] In the above-described protection method for the PCS charging and discharging equipment, the step of following steps is further included after the environmental conditions of the PCS charging and discharging equipment change:

[0017] When the switch module is in the closed state, the delay configuration switch module will disconnect when the environmental conditions of the PCS charging and discharging device change.

[0018] In the above-mentioned protection method for PCS charging and discharging equipment, the step of detecting two power-on states and determining whether the two power-on states are in a normal state includes the following steps:

[0019] Generate a first power-on signal and a second power-on signal that correspond one-to-one with the two power-on states, and determine whether the first power-on signal and the second power-on signal are normal;

[0020] Based on whether the first power-on signal and the second power-on signal are normal, the system will monitor whether the environmental state of the PCS charging and discharging device has changed.

[0021] In the above-described protection method for the PCS charging and discharging device, after the PCS module is triggered to start, the following steps are also included:

[0022] Obtain the start signal of the PCS module and determine whether the start signal is in a normal state;

[0023] When the start signal is normal, execute the output of a closed signal according to the charge / discharge start command, or the output of a disconnect signal according to the charge / discharge stop command;

[0024] If the startup signal is abnormal, restart the PCS module.

[0025] The protection method for the PCS charging and discharging equipment described above also includes obtaining the voltage value of the bus.

[0026] When the voltage value of the bus is not less than the set threshold, the following steps are executed: outputting a closed signal according to the charge / discharge start command, or outputting a disconnect signal according to the charge / discharge stop command.

[0027] When the voltage value of the bus is less than the set threshold, the voltage value of the bus is acquired again and / or a second alarm message is output.

[0028] In the above-mentioned protection method for PCS charging and discharging equipment, if the duration of the bus voltage value being less than a set threshold is within a preset time, the step of obtaining the bus voltage value again is executed.

[0029] If the voltage value of the bus is less than a set threshold for a duration that reaches or exceeds a preset time, the second alarm message will be output.

[0030] The present invention also provides a protection device for a PCS charging and discharging device, comprising:

[0031] The monitoring module is used to monitor whether the environmental conditions of the PCS charging and discharging equipment have changed.

[0032] The switch module is configured to have two power-on states: normally open and detection, and it is determined whether the two power-on states are in a normal state. The two power-on states correspond to the power-on states of the software control module and the hardware control module, respectively.

[0033] When the hardware control module is in a normal power-on state, and the software control module receives a charge / discharge start command based on the fact that the environmental state of the PCS charging / discharging equipment has not changed, it triggers the PCS module to start so that the voltage value of the bus can be increased to a preset voltage value. Then, it configures the switch module to close so that the load module and the bus can be connected through the switch module. The software control module then outputs a disconnect signal according to the charge / discharge stop command.

[0034] When the hardware control module is in a normal power-on state, the software control module is also configured to disconnect the switch module according to the change in the environmental state of the PCS charging and discharging equipment or when the disconnection signal is received, so that the load module and the bus are blocked by the switch module.

[0035] When the power-on state of the hardware control module is abnormal, the software control module is also used to output the first alarm information;

[0036] When the software control module is in a normal power-on state and the environmental conditions of the PCS charging and discharging equipment change, or when the software control module is in an abnormal power-on state, the hardware control module is used to configure the switch module to disconnect.

[0037] The beneficial effects of this invention after adopting the above technical solution are as follows:

[0038] The load module in this technical solution is specifically a single DC / DC converter. A switch module is set between the bus and the load module. The bus and the load module are connected through the switch module. By configuring the switch module to open and close, the output relay in the PCS module is prevented from performing large current operations when it is turned on, off, or under abnormal conditions, thus protecting the PCS module. When configuring the switch module, a combination of environmental monitoring and command control is used, so that the PCS module can cope with abnormal situations such as sudden increases in load and sudden power outages. This prevents the energy storage converter PCS in the charging and discharging equipment from being damaged by load impacts under abnormal current conditions such as initial power-on, sudden abnormal power outages, and sudden increases in load. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the protection device of the PCS charging and discharging equipment according to Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of the software control module and the hardware control module of Embodiment 1 of the present invention;

[0041] Figure 3 This is a flowchart of the control logic of the hardware control module in Embodiment 1 of the present invention;

[0042] Figure 4 This is a schematic diagram of the first power-on signal and the second power-on signal in Embodiment 1 of the present invention;

[0043] Figure 5 This is a flowchart of the protection method for the PCS charging and discharging device according to Embodiment 1 of the present invention.

[0044] Reference numerals in the attached diagram: 1. PCS module; 2. Busbar; 3. Switch module; 4. Load module; 5. Software control module; 6. Hardware control module; 7. Delay unit. Detailed Implementation

[0045] The technical solution of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention. Example

[0046] like Figure 1-5 As shown, the present invention provides a protection method for a PCS charging and discharging device, comprising the following steps:

[0047] Monitor whether the environmental conditions of the PCS charging and discharging equipment have changed;

[0048] Output a closed signal according to the charge / discharge start command, or output an open signal according to the charge / discharge stop command;

[0049] When the environmental state of the PCS charging and discharging equipment remains unchanged and the closing signal is received, the switch module 3 is configured to close so that the load module 4 and the bus 2 are connected through the switch module 3; when the environmental state of the PCS charging and discharging equipment changes or the closing signal is received, the switch module 3 is configured to open so that the load module 4 and the bus 2 are blocked by the switch module 3.

[0050] In this embodiment, the charging and discharging equipment can be a charging pile, a small storage station, or a production tool that uses new energy sources such as photovoltaics as the power source, etc. This embodiment does not impose too many restrictions on this.

[0051] In practical applications, this technical solution employs a software control module 5 to execute instructions and a hardware control module 6 to monitor the environment. This addresses abnormal current conditions such as initial power-on, momentary power outages, and sudden increases in load. For example, when the PCS charging / discharging equipment is already running and in standby mode, if the environment changes from normal to abnormal, the configuration switch module 3 disconnects to prevent the PCS module 1 from being impacted by the load module 4 due to a sudden increase in load. Another example is when the PCS charging / discharging equipment is initially powered on; the PCS module is started first, and before it fully starts, the configuration switch module disconnects the connection between bus 2 and load module 4 to prevent the PCS module from starting under load, thereby reducing current fluctuations. The starting current is used to prevent damage to the PCS module due to high current. Alternatively, if the PCS charging / discharging equipment is already turned on (i.e., PCS module 1 is fully started), but the bus 2 and load module 4 are not connected, and the user wants to charge or discharge the product, the switch module 3 is configured to close only after double confirmation based on the closing signal corresponding to the charging / discharging start command and monitoring the environment of the PCS charging / discharging equipment. This prevents the load from increasing instantaneously due to abnormal environment of the PCS charging equipment after the bus 2 and load module 4 are connected. In the above scenarios, the load module 4 can be effectively prevented from becoming a capacitor relative to the PCS module 1 by physical blocking, thus preventing the PCS module 1 from being subjected to load impact from the load module 4.

[0052] Combination Figure 3 and Figure 5 As shown, in this embodiment, the environmental state of the PCS charging and discharging equipment changes, including at least one abnormal signal among: access control abnormality monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus 2 voltage monitoring and input voltage abnormality monitoring;

[0053] The environmental conditions of the PCS charging and discharging equipment have not changed, including each normal signal among: access control anomaly monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus 2 voltage monitoring and input voltage anomaly monitoring;

[0054] Configure the switch module 3 according to the abnormal signal or the normal signal.

[0055] In actual operation, access control anomaly monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus 2 voltage monitoring, and input voltage anomaly monitoring are all used as quantitative indicators to identify PCS charging and discharging equipment. Each of the above quantitative indicators corresponds to two signals: a normal signal and an abnormal signal. Whenever at least one quantitative indicator generates an abnormal signal, the environment in which the PCS charging and discharging equipment is located is judged to be abnormal, that is, the PCS charging and discharging equipment has changed relative to its initial state (i.e., the state of normal use). Conversely, when all quantitative indicators generate normal signals, the environment in which the PCS charging and discharging equipment is located is judged to be normal, that is, the PCS charging and discharging equipment has not changed relative to its initial state (i.e., the state of normal use).

[0056] In practical applications, in addition to the above-mentioned quantitative indicators, quantitative indicators such as temperature monitoring and vibration monitoring can also be added. This embodiment does not impose too many restrictions on this.

[0057] Combination Figure 3 and Figure 5 As shown, this embodiment can use the above-mentioned quantitative indicators by arranging and combining OR gates and NOT gates, and combine them with logical operations to automatically determine whether the environment of the PCS charging and discharging device has changed. Alternatively, it can use AND gates and OR gates, or other logic gate circuits, to control and replace them. This embodiment does not impose too many restrictions on this.

[0058] A further improvement includes the following step when the environmental conditions of the PCS charging and discharging device change:

[0059] When the switch module 3 is in the closed state, the delay configuration switch module 3 will open when the environmental conditions of the PCS charging and discharging equipment change.

[0060] During normal operation, if any abnormalities are detected by AC voltage monitoring, bus 2 voltage monitoring, access control monitoring, water immersion monitoring, smoke monitoring, or emergency stop monitoring, the system enters an abnormal fault protection state and executes an abnormal handling process (including software and hardware control modules). In this abnormal handling process, to ensure more stable operation of the PCS charging and discharging equipment system and to prevent damage to the hardware control module 6 under severe abnormal conditions, signals from the software control module 5 are typically processed first, while the execution instructions from the hardware control module 6 are treated as secondary instructions and executed with a delay. This arrangement allows the software control module 5 time to execute the instructions corresponding to its signals, thereby enabling a soft shutdown to sequentially power off the charging system, energy storage system, and PCS charging and discharging equipment. This maximizes the safe and stable operation of the PCS charging and discharging equipment system and prevents data loss caused by the hardware control module 6 forcibly shutting down the PCS charging and discharging equipment before the software control module 5 signal is executed. In the entire PCS charging and discharging equipment system, the hardware control module 6 serves as the final safety guarantee, ensuring that the system does not suffer serious hardware damage under abnormal conditions.

[0061] The specific execution instruction of the aforementioned hardware control module 6 is that the environmental state of the PCS charging and discharging device changes, and the configuration switch module 3 is disconnected.

[0062] In practical implementation, combined with the above settings, after the monitoring information of the change in the environmental state of the PCS charging and discharging equipment is generated, the configuration switch module 3 will not be immediately disconnected. Instead, a blank time period is left before the configuration switch module 3 is disconnected, forming the effect of delayed execution of the hardware control module 6 instruction, so that the software control module 5 signal can be processed first. The delay time of the hardware control module 6 can be selected as 0.1s, 0.2s, 0.3s or 0.05-0.35s, etc., depending on the actual situation. The delay can also be canceled, i.e., 0s. This implementation does not impose too many restrictions on the delay duration.

[0063] The signals of the software control module 5 mentioned above can be used for electronically controlling the PCS charging and discharging equipment to shut down, retain data, issue alarms, upload to the server, cooperate with the switch module 3 to close or configure the switch module 3 to open, etc. This embodiment does not impose too many restrictions on this.

[0064] Another improvement to this embodiment includes the following steps before outputting a closed signal according to a charge / discharge start command or an open signal according to a charge / discharge stop command:

[0065] The switch module 3 is configured to have two power-on states: normally open and detection, and it is determined whether the two power-on states are in a normal state.

[0066] When the first power-on state is in a normal state, the PCS module 1 is triggered to start based on the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed, so as to increase the voltage value of the bus 2 to a preset voltage value.

[0067] When the second power-on state is in a normal state, the switch module 3 is configured to disconnect based on the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed.

[0068] In most PCS charging and discharging devices, the load module 4 is directly mounted on the bus 2. When the PCS module 1 is started, the PCS module 1, the bus 2, and the load module 4 are energized sequentially. At this time, the load module 4 in the PCS charging and discharging device is equivalent to the capacitor of the PCS module 1. At the moment of PCS module 1 starting, a relatively large instantaneous power will be generated on its DC impulse side, which will become an impulse load impacting the PCS module 1. That is, most existing PCS modules 1 do not have the ability to start under load on their DC output side. Before the PCS module 1 is started, the switch module 3 needs to be configured to be normally open, thereby blocking the conduction between the bus 2 and the load module 4 mounted on the bus 2, ensuring that the PCS module 1 starts under no-load, and avoiding the load impact on its DC side due to the PCS module 1 starting under load, thus preventing damage to the PCS module 1.

[0069] Here, "normally open" means that switch module 3 is configured to be disconnected in the normal state and initial state.

[0070] In practical use, when the software control module 5 determines that the hardware control module 6 is powered on normally, the software control module 5 begins to receive monitoring information on whether the environmental state of the PCS charging and discharging device has changed. If the environmental state of the PCS charging and discharging device has not changed, the software control module 5 triggers the PCS module 1 to start. If the environmental state of the PCS charging and discharging device changes, the configuration switch module 3 is disconnected. Meanwhile, when the hardware control module 6 determines that the software control module 5 is powered on normally, the hardware control module 6 begins to receive monitoring information on whether the environmental state of the PCS charging and discharging device has changed. If the environmental state of the PCS charging and discharging device changes, the configuration switch module 3 is disconnected. That is, whenever the environmental state of the PCS charging and discharging device changes, both the software control module 5 and the hardware control module 6 will issue instructions to the configuration switch module 3. At this time, the switch module 3 can be configured to disconnect upon receiving at least one of the above instructions. Alternatively, based on the characteristics of the software control module 5 being a soft shutdown and the hardware control module 6 being a forced shutdown, it is preferable to prioritize processing the instructions from the software control module 5 and delay processing the instructions from the hardware control module 6.

[0071] In the process of starting up the PCS charging and discharging equipment but not yet entering standby mode, the switch module 3 is configured to be normally open to prevent the PCS module 1 from being loaded during startup. In addition, before the PCS module 1 is officially started, two power-on states are detected. The two power-on states correspond to the power-on states of the software control module 5 and the hardware control module 6, respectively. The power-on states are used to confirm whether the operation is normal. Only when the two power-on states are in normal condition can the detection information of the environment be received.

[0072] If the hardware control module 6 determines that it is operating normally, the software control module 5 will begin to execute the relevant startup procedures step by step. If the software control module 5 determines that it is operating normally, the hardware control module 6 will begin to execute the relevant instructions. Only when both the software control module 5 and the hardware control module 6 are operating normally will the PCS charging and discharging equipment system officially start up and operate.

[0073] When at least one of the two power-on states is in an abnormal state, the switch module 3 is configured to disconnect and / or output a first alarm message.

[0074] In practice, if the hardware control module 6 determines that there is an abnormal operation or startup, the software control module 5 outputs the first alarm message; if the software control module 5 determines that there is an abnormal operation or startup, the hardware control module 6 configures the switch module 3 to disconnect. This is intended to provide physical protection by physically blocking the PCS module 1 before the software control module 5 has fully started operating.

[0075] In practical use, the power from the AC grid serves as the power source for both the software control module 5 and the hardware control module 6. Both the software control module 5 and the hardware control module 6 obtain power and power information from the AC grid. The power information can be used to determine whether the input voltage is normal, thus playing a role in monitoring whether the input voltage is normal.

[0076] During operation, the software control module 5 and the hardware control module 6 detect each other. For example, the software control module 5 detects the hardware control module 6, specifically detecting the first power-on signal of the hardware control module 6; the hardware control module 6 detects the software control module 5, specifically detecting the second power-on signal of the software control module 5.

[0077] Specifically, detecting two power-on states and determining whether the two power-on states are in a normal state includes the following steps:

[0078] Generate a first power-on signal and a second power-on signal that correspond one-to-one with the two power-on states, and determine whether the first power-on signal and the second power-on signal are normal;

[0079] When the first power-on state is in a normal state, the PCS module is triggered to start based on the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed, so as to increase the voltage value of the bus to a preset voltage value.

[0080] When the second power-on state is in normal condition, the switch module is configured to disconnect based on the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed.

[0081] When the software control module 5 is operating normally, it simultaneously generates a first power-on signal and outputs it to the hardware control module 6. The hardware control module 6 matches the received first power-on signal. The first power-on signal output by the software control module 5 during normal operation is also normal. The identification principle is that the first power-on signal is selected as a heartbeat signal. The hardware control module 6 uses a clock circuit to match the pulse interval frequency to identify whether the first power-on signal is normal, thus inferring whether the software control module 5 is functioning correctly. Similarly, when the hardware control module 6 is operating normally, it simultaneously generates a second power-on signal and outputs it to the software control module 5. The software control module 5 matches the received second power-on signal. The second power-on signal output by the hardware control module 6 during normal operation is also normal. The identification principle is that the second power-on signal is selected as a heartbeat signal. The software control module 5 uses a clock circuit to match the pulse interval frequency to identify whether the second power-on signal is normal, thus inferring whether the hardware control module 6 is functioning correctly. Besides the heartbeat signal, other types of pulse signals can also be selected for the first and second power-on signals; this example does not impose many restrictions on this.

[0082] In practice, if the first power-on signal generated and output by the software control module 5 is normal, the hardware control module 6 will receive monitoring information on whether the environmental state of the PCS charging and discharging device has changed; otherwise, if the first power-on signal generated and output by the software control module 5 is abnormal, the hardware control module 6 will configure the switch module 3 to disconnect.

[0083] Similarly, if the second power-on signal generated and output by the hardware control module 6 is normal, the software control module 5 receives monitoring information on whether the environmental state of the PCS charging and discharging device has changed; conversely, if the second power-on signal generated and output by the hardware control module 6 is abnormal, the software control module 5 executes the output of the first alarm information.

[0084] As a further improvement to this embodiment, after the PCS module 1 is started, the following steps are also included:

[0085] Obtain the start signal of the PCS module 1 and determine whether the start signal is in a normal state;

[0086] When the start signal is normal, execute the output of a closed signal according to the charge / discharge start command, or the output of a disconnect signal according to the charge / discharge stop command;

[0087] If the startup signal is abnormal, restart the PCS module 1.

[0088] After PCS module 1 starts normally, software control module 5 acquires the voltage value of bus 2 in real time and compares the acquired voltage value of bus 2 with a preset threshold to determine whether the voltage value of bus 2 is normal. Based on whether the voltage value of bus 2 is normal, it can be deduced in reverse whether there is any damage to the components on the input side of bus 2. When the voltage of bus 2 is abnormal and its voltage value is lower than the preset threshold, software control module 5 activates the protection mechanism and restarts PCS module 1. In addition, when the start signal is abnormal, it also includes outputting abnormal alarm information.

[0089] The threshold value is preferably 0.8, but it can also be selected as 0.7, 0.9, or 0.6-0.9s, etc., depending on the actual situation. This implementation does not impose too many restrictions on the threshold value.

[0090] Another improvement of this embodiment includes obtaining the voltage value of the bus 2;

[0091] When the voltage value of the bus 2 is not less than the set threshold, the following steps are executed: output a closed signal according to the charge / discharge start command, or output a disconnect signal according to the charge / discharge stop command.

[0092] When the voltage value of bus 2 is less than the set threshold, the voltage value of bus 2 is acquired again and / or a second alarm message is output.

[0093] After PCS module 1 starts up, the voltage value of bus 2 gradually increases until the voltage value of bus 2 reaches the system nominal voltage, i.e., the preset threshold. At this point, PCS module 1 has completed its startup. This prevents PCS module 1 from being connected to load module 4 before it has finished starting up, thus preventing PCS module 1 from being subjected to load impact. When the peak voltage of bus 2 is less than the preset threshold, the corresponding signals are stopped from being output according to the charge / discharge start command and charge / discharge stop command. This also serves to prevent PCS module 1 from being subjected to load impact.

[0094] Preferably, if the duration for which the voltage value of bus 2 is less than a set threshold is within a preset time, the step of obtaining the voltage value of bus 2 again is performed.

[0095] If the voltage value of bus 2 is less than the set threshold for a duration that reaches or exceeds a preset time, the second alarm message will be output.

[0096] In this embodiment, by setting a preset time, the duration for which the voltage value of bus 2 is less than a set threshold is compared with the preset time. When the duration is within the preset time, the voltage value of bus 2 is acquired again for comparison, so as to avoid misjudgment of the voltage value of bus 2 due to instantaneous voltage fluctuations. When the duration reaches or exceeds the preset time, a second alarm message is output and the voltage value of bus 2 is no longer acquired, so as to avoid forming a logical dead loop.

[0097] In addition, this embodiment can also use the number of times the voltage value of the set bus 2 is obtained as the comparison point to replace the preset time. This embodiment does not impose too many restrictions on the comparison point.

[0098] Similarly, the preset time or preset number of acquisitions can also be set after restarting the PCS module 1. The restart duration or number of restarts of the PCS module 1 is compared with the comparison point, and an alarm is output and the PCS module 1 is restarted in a selective manner, thereby avoiding the formation of a logical dead loop.

[0099] As a further improvement to this embodiment, after outputting a closed signal according to the charge / discharge start command or an open signal according to the charge / discharge stop command, the method further includes obtaining the open / closed state of the switch module 3.

[0100] Before the switch module 3 is configured to close, the switch module 3 is in a closed state, outputs a third alarm message and terminates the configuration of the switch module 3;

[0101] Before the switch module 3 is configured to be disconnected, the switch module 3 is in the disconnected state, outputs the third alarm information and terminates the execution of configuring the switch module 3;

[0102] When the switch module 3 is configured to close, the switch module 3 is in the open state and outputs the third alarm information;

[0103] When the switch module 3 is configured to be disconnected, the switch module 3 is in a closed state and outputs a third alarm message.

[0104] Before configuring switch module 3, obtain the current open / closed state of switch module 3. By comparing the current open / closed state with the corresponding open / closed state in the instruction, if the two are the same, then the software control module 5, switch module 3 and cloud platform and other components are damaged or down, and issue a third alarm message, and terminate the execution of configuring switch module 3.

[0105] Similarly, after configuring switch module 3, the current open / closed state of switch module 3 is obtained. By comparing the current open / closed state with the corresponding open / closed state in the instruction, if the two are opposite, then the software control module 5, switch module 3, cloud platform and other components are damaged or down, and a third alarm message is issued, and the execution of configuring switch module 3 is terminated.

[0106] In some embodiments, the first alarm message, the second alarm message, the third alarm message, and the abnormal alarm message can be relatively general and vague warning content, or they can be detailed; the four alarm messages can be completely identical, or each can have a specified description. The setting format can be varied and there are no excessive restrictions on it.

[0107] The present invention also provides a protection device for a PCS charging and discharging device, comprising:

[0108] like Figures 1-5 As shown, the monitoring module is used to monitor whether the environmental conditions of the PCS charging and discharging equipment have changed.

[0109] Software control module 5 is used to output a closed signal according to the charge / discharge start command, or to output a closed signal according to the charge / discharge stop command;

[0110] The hardware control module 6 is configured to close the switch module 3 when the environmental state of the PCS charging and discharging equipment does not change and the closing signal is received, so that the load module 4 and the bus 2 are connected through the switch module 3; and to open the switch module 3 when the environmental state of the PCS charging and discharging equipment changes or the opening signal is received, so that the load module 4 and the bus 2 are blocked by the switch module 3.

[0111] In specific implementation, the software control module 5 is preferably the software control module 5, and the hardware control module 6 is preferably the hardware control module 6. In addition, the software control module 5 and the hardware control module 6 can be replaced by other chips or PLC modules. This embodiment does not impose too many restrictions on this.

[0112] The monitoring module includes an access control anomaly monitoring unit, a water immersion monitoring unit, an emergency stop monitoring unit, a smoke monitoring unit, and an input voltage anomaly monitoring unit;

[0113] When the environmental conditions of the PCS charging and discharging equipment change, the hardware control module 6 is used to receive an abnormal signal output from at least one of the access control anomaly monitoring unit, the water immersion monitoring unit, the emergency stop monitoring unit, the smoke monitoring unit, and the input voltage anomaly monitoring unit.

[0114] When the environmental conditions of the PCS charging and discharging device do not change, the hardware control module 6 is used to receive the normal signal output from each of the access control anomaly monitoring unit, the water immersion monitoring unit, the emergency stop monitoring unit, the smoke monitoring unit, and the input voltage anomaly monitoring unit.

[0115] like Figure 3 As shown, in actual use, the hardware control module 6 is equipped with a delay unit 7. The hardware control module 6 uses the delay unit 7 to delay the processing of abnormal signals received from the monitoring module. During operation, at the moment when the abnormal signal of the monitored module is triggered, the hardware control module 6 still keeps the PCS charging and discharging device in a powered state for a certain period of time, so that the software control module 5 is kept powered on and executes instructions such as saving data and shutting down, thereby avoiding damage to the hardware.

[0116] The switch module 3 is configured to be normally open; the software control module 5 and the hardware control module 6 are also used to detect the two power-on states and determine whether the two power-on states are in a normal state.

[0117] When the first power-on state is in a normal state, the software control module 5 uses the monitoring information of whether the environmental state of the monitoring PCS charging and discharging equipment has changed to trigger the PCS module to start, so that the voltage value of the bus can be increased to the preset voltage value.

[0118] When the second power-on state is in a normal state, the hardware control module 6 configures the switch module 3 to disconnect based on the monitoring information of whether the environmental state of the PCS charging and discharging device has changed.

[0119] When at least one of the two power-on states is in an abnormal state, the software control module 5 is used to output a first alarm and / or the hardware control module 6 is used to configure the switch module 3 to disconnect.

[0120] The software control module 5 and the hardware control module 6 are further configured to perform the detection of two power-on states and determine whether the two power-on states are in a normal state, including:

[0121] The software control module 5 is used to generate a first power-on signal and output it to the hardware control module 6;

[0122] The hardware control module 6 is also used to, according to whether the first power-on signal is normal, execute the receiving of the monitoring information to receive whether the environmental state of the monitoring PCS charging and discharging device has changed, or configure the switch module 3 to disconnect.

[0123] The hardware control module 6 is also used to generate a second power-on signal and output it to the software control module 5;

[0124] The software control module 5 is further configured to, based on whether the second power-on signal is normal, execute the receiving of monitoring information regarding whether the environmental state of the monitoring PCS charging and discharging device has changed, or output the first alarm information.

[0125] After the PCS module 1 is triggered to start, the software control module 5 is also used to obtain the start signal of the PCS module 1 and determine whether the start signal is in a normal state.

[0126] When the start signal is normal, the software control module 5 is used to execute the output of a closed signal according to the charge / discharge start command, or the output of a disconnect signal according to the charge / discharge stop command;

[0127] When the startup signal is abnormal, the software control module 5 is used to restart the PCS module 1.

[0128] The software control module 5 is also used to acquire the voltage value of the bus 2;

[0129] When the voltage value of the bus 2 is not less than the set threshold, the software control module 5 is used to execute the output of a closed signal according to the charge / discharge start command, or the output of a disconnect signal according to the charge / discharge stop command;

[0130] When the voltage value of the bus 2 is less than the set threshold, the software control module 5 is used to obtain the voltage value of the bus 2 again and / or output a second alarm message.

[0131] If the duration of the voltage value of bus 2 being less than a set threshold is within a preset time, the software control module 5 is used to execute the re-acquisition of the voltage value of bus 2.

[0132] If the voltage value of bus 2 is less than the set threshold for a duration that reaches or exceeds a preset time, the software control module 5 is used to execute the output of the second alarm information.

[0133] After the software control module 5 outputs a closed signal according to the charge / discharge start command or an open signal according to the charge / discharge stop command, it is also used to obtain the open / closed state of the switch module 3.

[0134] Before the hardware control module 6 configures the switch module 3 to close, the switch module 3 is in a closed state, outputs a third alarm message and terminates the execution of configuring the switch module 3.

[0135] Before the hardware control module 6 configures the switch module 3 to be disconnected, the switch module 3 is in the disconnected state, outputs the third alarm information and terminates the execution of configuring the switch module 3;

[0136] When the hardware control module 6 configures the switch module 3 to close, the switch module 3 is in the open state and outputs the third alarm information;

[0137] When the hardware control module 6 configures the switch module 3 to be disconnected, the switch module 3 is in a closed state and outputs a third alarm message.

[0138] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A protection method for a PCS charging and discharging device, characterized in that, Includes the following steps: Monitor whether the environmental conditions of the PCS charging and discharging equipment have changed; The switch module is configured to have two power-on states: normally open and detection, and it is determined whether the two power-on states are in a normal state. The two power-on states correspond to the power-on states of the software control module and the hardware control module, respectively. When the hardware control module is in a normal power-on state, and the software control module receives a charge / discharge start command based on the fact that the environmental state of the PCS charging / discharging equipment has not changed, it triggers the PCS module to start so that the voltage value of the bus can be increased to a preset voltage value. Then, it configures the switch module to close so that the load module and the bus can be connected through the switch module. Finally, it outputs a disconnect signal according to the charge / discharge stop command. When the hardware control module is in a normal power-on state, the software control module also configures the switch module to disconnect when the environmental state of the PCS charging and discharging equipment changes or when the disconnection signal is received, so that the load module and the bus are blocked by the switch module. When the power-on state of the hardware control module is abnormal, the software control module is also used to output the first alarm information; When the software control module is in a normal power-on state and the environmental conditions of the PCS charging and discharging equipment change, or when the software control module is in an abnormal power-on state, the hardware control module is used to configure the switch module to disconnect.

2. The protection method for the PCS charging and discharging device according to claim 1, characterized in that, The environmental conditions of the PCS charging and discharging equipment change, including: At least one abnormal signal from the following: access control anomaly monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring, and input voltage anomaly monitoring; The environmental conditions of the PCS charging and discharging equipment remained unchanged, including: Each normal signal in access control anomaly monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring, and input voltage anomaly monitoring; Configure the switch module according to the abnormal signal or the normal signal.

3. The protection method for the PCS charging and discharging device according to claim 1, characterized in that, When the environmental conditions of the PCS charging and discharging equipment change, the method further includes the following steps: When the switch module is in the closed state, the delay configuration switch module will disconnect when the environmental conditions of the PCS charging and discharging device change.

4. The protection method for the PCS charging and discharging device according to claim 1, characterized in that, The detection of two power-on states and the determination of whether the two power-on states are in a normal state includes the following steps: Generate a first power-on signal and a second power-on signal that correspond one-to-one with the two power-on states, and determine whether the first power-on signal and the second power-on signal are normal; Based on whether the first power-on signal and the second power-on signal are normal, the monitoring information on whether the environmental state of the monitoring PCS charging and discharging device has changed is executed accordingly.

5. The protection method for the PCS charging and discharging device according to claim 1, characterized in that, After the PCS module is triggered to start, the following steps are also included: Obtain the start signal of the PCS module and determine whether the start signal is in a normal state; When the start signal is normal, execute the output of a closed signal according to the charge / discharge start command, or the output of a disconnect signal according to the charge / discharge stop command; If the startup signal is abnormal, restart the PCS module.

6. The protection method for the PCS charging and discharging device according to claim 1, characterized in that, It also includes acquiring the voltage value of the bus; When the voltage value of the bus is not less than the set threshold, the system executes the output of a closed signal according to the charge / discharge start command, or the output of a disconnect signal according to the charge / discharge stop command. When the voltage value of the bus is less than the set threshold, the voltage value of the bus is acquired again and / or a second alarm message is output.

7. The protection method for the PCS charging and discharging device according to claim 6, characterized in that, If the duration of the bus voltage value being less than a set threshold is within a preset time, then the step of obtaining the bus voltage value again is executed. If the voltage value of the bus is less than a set threshold for a duration that reaches or exceeds a preset time, the second alarm message will be output.

8. A protection device for a PCS charging and discharging device, characterized in that, include: The monitoring module is used to monitor whether the environmental conditions of the PCS charging and discharging equipment have changed. The switch module is configured to have two power-on states: normally open and detection, and it is determined whether the two power-on states are in a normal state. The two power-on states correspond to the power-on states of the software control module and the hardware control module, respectively. When the hardware control module is in a normal power-on state, and the software control module receives a charge / discharge start command based on the fact that the environmental state of the PCS charging / discharging equipment has not changed, it triggers the PCS module to start so that the voltage value of the bus can be increased to a preset voltage value. Then, it configures the switch module to close so that the load module and the bus can be connected through the switch module. The software control module then outputs a disconnect signal according to the charge / discharge stop command. When the hardware control module is in a normal power-on state, the software control module is also configured to disconnect the switch module according to the change in the environmental state of the PCS charging and discharging equipment or when the disconnection signal is received, so that the load module and the bus are blocked by the switch module. When the power-on state of the hardware control module is abnormal, the software control module is also used to output the first alarm information; When the software control module is in a normal power-on state and the environmental conditions of the PCS charging and discharging equipment change, or when the software control module is in an abnormal power-on state, the hardware control module is used to configure the switch module to disconnect.

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