Method and device for protecting PCS charging and discharging equipment

Abstract

The invention belongs to the field of charging and discharging equipment, and discloses a protection method for PCS charging and discharging equipment, which comprises the following steps: monitoring whether the environment state of the PCS charging and discharging equipment is changed or not; a closing signal is output according to the charging and discharging starting instruction, or a disconnecting signal is output according to the charging and discharging stopping instruction; when the environment state of the PCS charging and discharging equipment does not change and a closing signal is received, the switch module is configured to be closed, so that the load module and the bus are conducted through the switch module; when the environment state of the PCS charging and discharging equipment changes or a disconnection signal is received, the switch module is configured to be disconnected, so that the load module and the bus are disconnected by the switch module, the invention further discloses a protection device of the PCS charging and discharging equipment, and the protection device comprises a monitoring module, a software control module and a hardware control module in the method. According to the technical scheme, the energy storage converter PCS in the charging and discharging equipment can be prevented from being damaged due to load impact under the abnormal current conditions of initial power-on, instant abnormal power-off, instant load increasing and the like.

Description

Technical Field

[0001] The present invention relates to the field of charging and discharging equipment, and in particular to a protection method and device for PCS charging and discharging equipment. Background Art

[0002] As a green and new energy source, electricity has become one of the public's preferred energy sources because of its environmentally friendly and pollution-free use and low economic burden. It has a wide acceptance and usage among the public. With the increase in application scenarios and the launch of new electric products, it has continuously promoted the development of electricity storage technology and charging and discharging technology. Among them, in order to meet the high-power and fast charging of new energy vehicles, charging and discharging equipment such as charging piles have been developed that can support high-power and high-voltage charging of vehicles.

[0003] At present, charging and discharging equipment is mainly composed of an energy storage inverter PCS for obtaining electricity from the power grid, a high-voltage DC bus and a DC converter DC / DC for connecting a charging gun. The energy storage inverter PCS is the core component, which plays the role of power conversion between alternating current AC and direct current DC. In specific use, in order to achieve a higher power output effect, the charging and discharging equipment often sets multiple energy storage inverters PCS in parallel and also sets multiple DC converters DC / DC in parallel. The output side of the multiple energy storage inverters PCS in parallel is mounted on the DC high-voltage bus, and the input side of the multiple DC converters DC / DC in parallel is mounted on the DC high-voltage bus. The DC high-voltage bus serves as an intermediate component to transfer the power on the energy storage inverter PCS to the DC converter DC / DC, and outputs it to the product through the DC converter DC / DC. Among them, the energy storage inverter PCS and DC converter DC / DC with bidirectional functions can transmit power to the power grid through product discharge.

[0004] The existing energy storage charging and discharging PCS has performance differences between energy storage converters PCS of the same brand due to different manufacturer standards and different quality control requirements. The performance differences between energy storage converters PCS of different brands are even greater, resulting in electrical performance compatibility defects inside the charging and discharging equipment. The compatibility defects are mainly reflected in the fact that the storage converter PCS cannot be disconnected in time due to different load-carrying capacity and breaking capacity of the output relay inside the energy storage converter PCS; and different DC / DC converters are connected in parallel on the high-voltage bus to form bus capacitance on the DC high-voltage bus. For the energy storage converter PCS, these bus capacitances will become impact loads due to instantaneous large current and high power during the power-on and startup of the energy storage converter PCS or abnormal power-off process, causing damage to the energy storage charging and discharging PCS and DC / DC converter. That is, the existing charging and discharging equipment is very easy to be damaged under abnormal conditions such as power-on process, power-off process and instantaneous increase in load, and has product defects such as low durability and high maintenance cost. Summary of the invention

[0005] The purpose of the present 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 load increase.

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

[0007] Monitor whether the environmental status of PCS charging and discharging equipment has changed;

[0008] Output a closing signal according to a charge and discharge start instruction, or output a disconnecting signal according to a charge and discharge stop instruction;

[0009] When the environmental state of the PCS charging and discharging equipment has not changed and the closing signal is received, the switch module is configured 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 has changed, or the disconnection signal is received, the switch module is configured to disconnect so that the load module and the bus are blocked by the switch module.

[0010] 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 of access control abnormality monitoring, flooding monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring and input voltage abnormality monitoring;

[0011] The environmental status of the PCS charging and discharging equipment has not changed, including: each normal signal in access control abnormality monitoring, flooding monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring and input voltage abnormality monitoring;

[0012] The switch module is configured accordingly according to the abnormal signal or the normal signal.

[0013] In the above-mentioned protection method for PCS charging and discharging equipment, when the environmental state of the PCS charging and discharging equipment changes, the following steps are also included:

[0014] When the switch module is in a closed state, when the environmental state of the PCS charging and discharging equipment changes, the delay configuration switch module is disconnected.

[0015] In the above-mentioned protection method for PCS charging and discharging equipment, before outputting a closing signal according to a charging and discharging start instruction or outputting a disconnecting signal according to a charging and discharging stop instruction, the following steps are also included:

[0016] Configuring the switch module to be normally open and to detect two power-on states, and determining whether the two power-on states are in a normal state;

[0017] The first power-on state is in a normal state, and according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed, the PCS module is triggered to start, so as to increase the voltage value of the bus to a preset voltage value;

[0018] The second switch state is in a normal state, and the switch module is configured to be disconnected according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed.

[0019] In the above-mentioned protection method for PCS charging and discharging equipment, when at least one of the two power-on states is in an abnormal state, the switch module is configured to disconnect and / or output a first alarm message.

[0020] In the above-mentioned protection method for PCS charging and discharging equipment, the detecting of two power-on states and judging whether the two power-on states are in a normal state comprises the following steps:

[0021] Generate a first power-on signal and a second power-on signal corresponding to the two power-on states, and determine whether the first power-on signal and the second power-on signal are normal;

[0022] According to whether the first power-on signal and the second power-on signal are normal, the execution of receiving the monitoring information of whether the environmental state of the PCS charging and discharging equipment is changed is performed respectively.

[0023] In the above-mentioned protection method for PCS charging and discharging equipment, after the triggering of the PCS module to start, the following steps are also included:

[0024] Obtaining a start signal of the PCS module, and determining whether the start signal is in a normal state;

[0025] When the start signal is normal, outputting a closing signal according to the charge and discharge start instruction, or outputting a disconnecting signal according to the charge and discharge stop instruction;

[0026] When the start signal is abnormal, the PCS module is restarted.

[0027] In the above-mentioned protection method for PCS charging and discharging equipment, it also includes obtaining the voltage value of the bus;

[0028] When the voltage value of the bus is not less than a set threshold, outputting a closing signal according to a charge and discharge start instruction, or outputting a disconnecting signal according to a charge and discharge stop instruction;

[0029] When the voltage value of the bus is less than a set threshold, the voltage value of the bus is acquired again and / or a second alarm message is output.

[0030] In the above-mentioned protection method for PCS charging and discharging equipment, if the duration of the voltage value of the bus bar being less than the set threshold value is within a preset time, the step of obtaining the voltage value of the bus bar again is performed;

[0031] When the duration of the voltage value of the bus being less than the set threshold reaches or exceeds the preset time, the output of the second alarm information is executed.

[0032] The present invention also provides a protection device for PCS charging and discharging equipment, comprising:

[0033] Monitoring module, used to monitor whether the environmental status of the PCS charging and discharging equipment has changed;

[0034] A software control module, used to output a closing signal according to a charge and discharge start instruction, or output a disconnection signal according to a charge and discharge stop instruction;

[0035] The hardware control module is used to configure the switch module to close when the environmental state of the PCS charging and discharging device does not change and receives the closing signal, so that the load module and the bus are connected through the switch module; when the environmental state of the PCS charging and discharging device changes, or receives the disconnection signal, configure the switch module to disconnect, so that the load module and the bus are blocked by the switch module.

[0036] After adopting the above technical solution, the present invention has the following beneficial effects:

[0037] The load module in the technical solution is specifically a single DC / DC converter. A switch module is arranged between the bus and the load module. The bus and the load module are connected through the switch module. The switch module is configured to open and close to avoid the output relay in the PCS module from performing actions with large current when it is turned on, off or in abnormal conditions, so as to protect the PCS module. When configuring the switch module, a mixed combination of environmental monitoring and command control is adopted, so that the PCS module can respond to abnormal conditions in which the load increases momentarily and can also cope with momentary power outages. In abnormal current conditions such as initial power-on, momentary abnormal power outages and momentary increase in load, the energy storage converter PCS in the charging and discharging equipment is prevented from being damaged by load impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of a protection device for PCS charging and discharging equipment according to Embodiment 1 of the present invention;

[0039] Figure 2 is a schematic diagram of a software control module and a hardware control module of Embodiment 1 of the present invention;

[0040] Figure 3is a flow chart of the control logic of the hardware control module of embodiment 1 of the present invention;

[0041] Figure 4 is a schematic diagram of a first power-on signal and a second power-on signal in Embodiment 1 of the present invention;

[0042] Figure 5 It is a flow chart of the protection method of the PCS charging and discharging equipment according to the first embodiment of the present invention.

[0043] Figure numerals: 1. PCS module; 2. bus; 3. switch module; 4. load module; 5. software control module; 6. hardware control module; 7. delay unit. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods, but does not constitute any limitation to the present invention.

[0045] Embodiment 1:

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

[0047] Monitor whether the environmental status of PCS charging and discharging equipment has changed;

[0048] Output a closing signal according to a charge and discharge start instruction, or output a disconnecting signal according to a charge and discharge stop instruction;

[0049] When the environmental state of the PCS charging and discharging equipment has not changed and the closing signal is received, the switch module 3 is configured to be closed 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 has changed, or the disconnection signal is received, the switch module 3 is configured to be disconnected 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 power station, or a production tool that uses new energy such as photovoltaics as a power source, etc. This embodiment does not impose too many restrictions on this.

[0051] In practical applications, the technical solution adopts the method of software control module 5 executing instructions and hardware control module 6 monitoring the environment to deal with abnormal current conditions such as initial power-on, instantaneous abnormal power off and instantaneous increase in load. For example, when the PCS charging and discharging equipment has been started and is in standby mode, when the environment of the PCS charging and discharging equipment changes from normal to abnormal, the switch module 3 is configured to disconnect to prevent the PCS module 1 from being impacted by the load module 4 due to the instantaneous increase in load; for another example, when the PCS charging and discharging equipment is initially powered on, the PCS module is started first, and before the PCS module is fully started, the switch module is configured to disconnect the connection between the bus 2 and the load module 4 to prevent the PCS module from starting with load, thereby reducing Starting current to prevent the PCS module from being damaged by large current; or when the PCS charging and discharging equipment is turned on (that is, PCS module 1 is fully started), but the bus 2 and load module 4 are not connected, the user wants to charge and discharge the product. Before configuring the switch module 3 to close, double confirmation is made based on the closing signal corresponding to the charging and discharging starting instruction and the monitoring of the environment of the PCS charging and discharging equipment. Only then is the switch module 3 configured to close to avoid the load from increasing instantly due to the abnormal environment of the PCS charging equipment after the bus 2 and load module 4 are connected. The above scenarios can effectively prevent the load module 4 from becoming a capacitor relative to the PCS module 1 and prevent the PCS module 1 from being impacted by the load of the load module 4 by physical blocking.

[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 of access control abnormality monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus 2 voltage monitoring and input voltage abnormality monitoring;

[0053] The environmental status of the PCS charging and discharging equipment has not changed, including: each normal signal in access control abnormality monitoring, flooding monitoring, emergency stop monitoring, smoke monitoring, bus 2 voltage monitoring and input voltage abnormality monitoring;

[0054] The switch module 3 is configured accordingly according to the abnormal signal or the normal signal.

[0055] In specific operations, access control abnormality monitoring, water immersion monitoring, emergency stop monitoring, smoke monitoring, bus 2 voltage monitoring and input voltage abnormality monitoring are all used as quantitative indicators to identify PCS charging and discharging equipment. Each of the above quantitative indicators corresponds to two signals, one is a normal signal and the other is 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 the initial state (that is, the state of normal use). On the contrary, all quantitative indicators generate normal signals, and 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 the initial state (that is, the state of normal use).

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

[0057] Combination Figure 3 and Figure 5 As shown, in this embodiment, the above quantitative indicators can be arranged and combined by OR gate plus NOT gate, combined with logical operation to automatically determine whether the environment of the PCS charging and discharging equipment has changed. In addition, other logic gate circuits such as AND gate plus OR gate can be used for replacement. This embodiment does not impose too many restrictions on this.

[0058] Further improvement, when the environmental state of the PCS charging and discharging equipment changes, the following steps are also included:

[0059] The switch module 3 is in a closed state. When the environmental state of the PCS charging and discharging equipment changes, the delay configuration switch module 3 is disconnected.

[0060] During normal operation, if the AC voltage monitoring, bus 2 voltage monitoring, access control monitoring, flood monitoring, smoke monitoring, and emergency stop monitoring are abnormal, the abnormal fault protection state is entered and the abnormal processing flow (including software and hardware control modules) is executed. In the process of executing the abnormal processing, in order to make the system operation of the PCS charging and discharging equipment more stable, and also to avoid the hardware control module 6 being damaged in the system under severe abnormal conditions, the software control module 5 signal is often processed first, and the execution instruction of the hardware control module 6 is used as a secondary instruction and delayed execution. The above setting method enables the software control module 5 to have time to execute the instruction corresponding to the software control module 5 signal, so as to strive to shut down the charging system, energy storage system and PCS charging and discharging equipment in sequence in a soft shutdown manner, so as to maximize the safe and stable operation of the PCS charging and discharging equipment system, and avoid the PCS charging and discharging equipment being forced to shut down by the hardware control module 6 instruction when the software control module 5 signal is not executed, resulting in data loss; in the entire PCS charging and discharging equipment system, the hardware control module 6 is the last safety guarantee to ensure that the system will not suffer serious hardware damage under abnormal conditions.

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

[0062] In specific 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 disconnected immediately, but a blank time period will be left before the configuration switch module 3 is disconnected, forming the effect of delayed execution of the hardware control module 6 instruction, so as to provide priority processing for the signal of the software control module 5; wherein, the delay time of the execution of the hardware control module 6 can be selected as 0.1s, 0.2s, 0.3s or 0.05-0.35s, etc. according to actual conditions, and the delay setting can also be canceled, that is, 0s. This implementation does not impose too many restrictions on the delay duration.

[0063] The above-mentioned software control module 5 signal can be specifically used to electronically control the PCS charging and discharging equipment to shut down, retain data, issue an alarm, upload to a server, cooperate with the switch module 3 to close or configure the switch module 3 to disconnect, etc. This embodiment does not impose too many restrictions on this.

[0064] Another improvement of this embodiment, before outputting a closing signal according to the charge and discharge start instruction, or outputting a disconnecting signal according to the charge and discharge stop instruction, further comprises the following steps:

[0065] Configuring the switch module 3 to be normally open and to detect two power-on states, and determining whether the two power-on states are in a normal state;

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

[0067] The second switch state is in a normal state, and the switch module 3 is configured to be disconnected according to 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 in sequence. At this time, the load module 4 in the PCS charging and discharging device is equivalent to the capacitor of the PCS module 1. The moment the PCS module 1 is started, a relatively large instantaneous power will be caused on its DC impact side, and it will become an impact load that impacts the PCS module 1. That is, most of the existing PCS modules 1 do not have the ability to start with 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, so as to block the conduction between the bus 2 and the load module 4 mounted on the bus 2, so as to ensure that the PCS module 1 is started without load, avoid the DC side of the PCS module 1 being subjected to load impact due to the load starting, and prevent damage to the PCS module 1.

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

[0070] In specific use, when the software control module 5 determines that the startup state of the hardware control module 6 is normal, the software control module 5 starts to receive the monitoring information of whether the environmental state of the PCS charging and discharging device has changed. When 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. When the environmental state of the PCS charging and discharging device has changed, the configuration switch module 3 is disconnected; and the hardware control module 6 determines that the startup state of the software control module 5 is normal, the hardware control module 6 starts to receive the monitoring information of whether the environmental state of the PCS charging and discharging device has changed. When the environmental state of the PCS charging and discharging device has changed, the configuration switch module 3 is disconnected; that is, whenever the environmental state of the PCS charging and discharging device has not changed, the software control module 5 and the hardware control module 6 will respectively issue instructions to configure the switch module 3. At this time, the switch module 3 can be configured to be disconnected when at least one of the above instructions is received, or it can be preferably configured to give priority to the instructions of the software control module 5 and delay the processing of the instructions of the hardware control module 6 according to the characteristics that the software control module 5 is soft shutdown and the hardware control module 6 is forced shutdown.

[0071] Among them, when the PCS charging and discharging equipment starts to start but has not entered the standby state, the switch module 3 is configured to be normally open to prevent the PCS module 1 from being loaded during the startup process. In addition, before the PCS module 1 is officially started, two startup states are detected. The two switch states correspond to the startup states of the software control module 5 and the hardware control module 6 respectively. Whether it is operating normally is confirmed by the startup state. The two startup states are each in a normal state, and then the detection information of the environment is received respectively;

[0072] If the hardware control module 6 determines that it is operating normally, the software control module 5 begins to gradually execute relevant startups, and if the software control module 5 determines that it is operating normally, the hardware control module 6 begins to execute relevant instructions, so that the system of the PCS charging and discharging equipment is officially started and operated only when both the software control module 5 and the hardware control module 6 are operating normally.

[0073] Wherein, 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 a specific implementation, if the hardware control module 6 determines that the operation or startup is abnormal, the software control module 5 outputs a first alarm message; if the software control module 5 determines that the operation or startup is abnormal, the hardware control module 6 configures the switch module 3 to disconnect, aiming at physically blocking the PCS module 1 through the hardware control module 6 before the software control module 5 is fully operational, thereby providing physical protection.

[0075] In actual use, the power on the AC power grid is the power source of 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 power grid. The power information can be used to determine whether the input voltage is normal, thereby playing the role of monitoring whether the input voltage is normal.

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

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

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

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

[0080] The second switch state is in a normal state, and the switch module is configured to be disconnected according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed.

[0081] When the software control module 5 operates normally, a first power-on signal is generated and output to the hardware control module 6 at the same time. The hardware control module 6 matches the received first power-on signal. The first power-on signal output by the normal operation of the software control module 5 is also normal. The recognition principle is that the first power-on signal is selected as a heartbeat signal. The hardware control module 6 matches the pulse interval frequency through a clock circuit to identify whether the first power-on signal is normal, thereby reversely deducing whether the software control module 5 is normal; similarly, when the hardware control module 6 operates normally, a second power-on signal is generated and output to the software control module 5 at the same time. The software control module 5 matches the received second power-on signal. The second power-on signal output by the normal operation of the hardware control module 6 is also normal. The recognition principle is that the second power-on signal is selected as a heartbeat signal. The software control module 5 matches the pulse interval frequency through a clock circuit to identify whether the second power-on signal is normal, thereby reversely deducing whether the hardware control module 6 is normal; in addition to selecting a heartbeat signal, the first power-on signal and the second power-on signal can also select other types of pulse signals, and this example does not impose too many restrictions on this.

[0082] In the specific implementation, the first power-on signal generated and output by the software control module 5 is normal, and the hardware control module 6 executes the receiving of the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed; otherwise, the first power-on signal generated and output by the software control module 5 is abnormal, and the hardware control module 6 executes the configuration of disconnecting the switch module 3.

[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 the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed; otherwise, 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 of this embodiment, after the PCS module 1 is started, the following steps are further included:

[0085] Obtaining a start signal of the PCS module 1, and determining whether the start signal is in a normal state;

[0086] When the start signal is normal, outputting a closing signal according to the charge and discharge start instruction, or outputting a disconnecting signal according to the charge and discharge stop instruction;

[0087] When the start signal is abnormal, the PCS module 1 is restarted.

[0088] After the PCS module 1 is started normally, the software control module 5 obtains the voltage value of the bus 2 in real time, and compares the obtained voltage value of the bus 2 with the preset threshold value, so as to determine whether the voltage value of the bus 2 is normal. According to whether the voltage value of the bus 2 is normal, it can be reversely deduced whether there are any damaged components on the input side of the bus 2. When the voltage of the bus 2 is abnormal and its voltage value is lower than the preset threshold, the software control module 5 starts the protection mechanism and restarts the PCS module 1. In addition, when the startup signal is abnormal, it also includes output abnormal alarm information.

[0089] The above threshold is preferably 0.8s, and can also be selected as 0.7, 0.9 or 0.6-0.9s, etc. according to actual conditions. This implementation does not impose too many restrictions on the threshold.

[0090] Another improvement of this embodiment further 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 output of the closing signal according to the charge and discharge start instruction or the output of the disconnection signal according to the charge and discharge stop instruction is executed;

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

[0093] After the PCS module 1 is started, the voltage value of the bus 2 gradually increases until the voltage value of the bus 2 reaches the system nominal voltage, i.e., the preset threshold value. The startup of the PCS module 1 is completed, so as to avoid the PCS module 1 from carrying the load module 4 before the startup is completed, and to prevent the PCS module 1 from being subjected to load shock. When the voltage peak of the bus 2 is less than the preset threshold value, the corresponding signals are stopped according to the charge and discharge start instruction and the charge and discharge stop instruction, which also serves to prevent the PCS module 1 from being subjected to load shock.

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

[0095] When the duration of the voltage value of the bus 2 being less than the set threshold reaches or exceeds the preset time, the output of the second alarm information is executed.

[0096] In this embodiment, a preset time is set, and the duration that the voltage value of bus 2 is less than the set threshold is compared with the preset time. When the duration is within the preset time, the voltage value of bus 2 is obtained again for comparison 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 obtained to avoid the formation of a logical dead loop.

[0097] In addition, the present embodiment may also use the number of acquisitions of the voltage value of the bus 2 as a comparison point to replace the preset time, and the present embodiment does not impose too many restrictions on the comparison point.

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

[0099] As a further improvement of this embodiment, after the closing signal is output according to the charge and discharge start instruction, or the disconnection signal is output according to the charge and discharge stop instruction, the on-off state of the switch module 3 is also obtained;

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

[0102] After the switch module 3 is configured to be closed, the switch module 3 is in an open state and outputs a third alarm information;

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

[0104] Before configuring the switch module 3, the switch module 3 is opened and closed at this time, and the opening and closing state at this time is compared with the opening and closing state corresponding to the instruction. If the two are the same, the software control module 5, the switch module 3 and the cloud platform and other components are damaged or down, and a third alarm message is issued, and the configuration of the switch module 3 is terminated;

[0105] Similarly, after configuring the switch module 3, the opening and closing state of the switch module 3 at this time is obtained, and the opening and closing state at this time is compared with the opening and closing state corresponding to the instruction. If the two are opposite, the software control module 5, the switch module 3, the cloud platform and other components are damaged or down, and a third alarm message is issued, and the execution of the configuration of the switch module 3 is terminated.

[0106] In some embodiments, the first alarm information, the second alarm information, the third alarm information and the abnormal alarm information can be relatively general and abstract warning contents, or detailed descriptions; the four alarm information can also be exactly the same, or each can have a specified description, and the setting form can be selected in a variety of ways, without too many restrictions.

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

[0108] like Figure 1-Figure 5 As shown, the monitoring module is used to monitor whether the environmental state of the PCS charging and discharging equipment changes;

[0109] The software control module 5 is used to output a closing signal according to a charge and discharge start instruction, or output a disconnection signal according to a charge and discharge stop instruction;

[0110] The hardware control module 6 is used to configure the switch module 3 to close when the environmental state of the PCS charging and discharging equipment has not changed and the closing signal is received, 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 disconnection signal is received, configure the switch module 3 to disconnect, so that the load module 4 and the bus 2 are blocked by the switch module 3.

[0111] In a 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 also be replaced by other chips or PLC modules, and this embodiment does not impose too many restrictions on this.

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

[0113] When the environmental state of the PCS charging and discharging equipment changes, the hardware control module 6 is used to receive an abnormal signal output by at least one of the access control abnormality monitoring unit, the water immersion monitoring unit, the emergency stop monitoring unit, the smoke monitoring unit, and the input voltage abnormality monitoring unit;

[0114] When the environmental state of the PCS charging and discharging equipment has not changed, the hardware control module 6 is used to receive a normal signal output by each of the access control abnormality monitoring unit, the water immersion monitoring unit, the emergency stop monitoring unit, the smoke monitoring unit and the input voltage abnormality monitoring unit.

[0115] like Figure 3 As shown, in actual use, a delay unit 7 is provided in the hardware control module 6, and the hardware control module 6 delays the processing of the abnormal signal received from the monitoring module through the delay unit 7; 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 equipment in a powered-on state for a certain period of time, keeps the software control module 5 powered-on, and executes instructions such as saving data and shutting down, so as to avoid 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 execute the detection of the two power-on states and determine whether the two power-on states are in a normal state;

[0117] The first power-on state is in a normal state, and the software control module 5 is used to trigger the PCS module to start according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed, so that the voltage value of the busbar is increased to a preset voltage value;

[0118] When the second switch state is in a normal state, the hardware control module 6 is used to configure the switch module 3 to disconnect according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment 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 be disconnected.

[0120] The software control module 5 and the hardware control module 6 are further used to execute the detection of the 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 further configured to, according to whether the first power-on signal is normal, correspondingly execute the receiving of the monitoring information to receive the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed, or configure the switch module 3 to be disconnected;

[0123] The hardware control module 6 is further 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 execute the receiving of the monitoring information to monitor whether the environmental state of the PCS charging and discharging equipment has changed, or the output of the first alarm information, according to whether the second power-on signal is normal.

[0125] After the PCS module 1 is triggered to start, the software control module 5 is further used to obtain a 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 the closing signal according to the charge and discharge start instruction, or output the disconnection signal according to the charge and discharge stop instruction;

[0127] When the start 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 obtain the voltage value of the bus 2;

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

[0130] When the voltage value of the bus 2 is less than a 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] The duration of the voltage value of the bus 2 being less than the set threshold is within a preset time, and the software control module 5 is used to execute the step of obtaining the voltage value of the bus 2 again;

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

[0133] The software control module 5 is further used to obtain the opening and closing state of the switch module 3 after outputting the closing signal according to the charge and discharge start instruction or outputting the opening signal according to the charge and discharge stop instruction;

[0134] Before the hardware control module 6 configures the switch module 3 to be closed, the switch module 3 is in a closed state, outputs a third alarm message and terminates the configuration of 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 a disconnected state, outputs a third alarm message and terminates the configuration of the switch module 3;

[0136] After the hardware control module 6 configures the switch module 3 to be closed, the switch module 3 is in an open state and outputs a third alarm message;

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

[0138] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A protection method for PCS charging and discharging equipment, characterized in that: The following steps are involved: Monitor whether the environmental status of PCS charging and discharging equipment has changed; Output a closing signal according to a charge and discharge start instruction, or output a disconnecting signal according to a charge and discharge stop instruction; When the environmental state of the PCS charging and discharging equipment has not changed and the closing signal is received, the switch module is configured 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 has changed, or the disconnection signal is received, the switch module is configured to disconnect so that the load module and the bus are blocked by the switch module.

2. The protection method for PCS charging and discharging equipment according to claim 1, characterized in that: The environmental state of the PCS charging and discharging equipment changes, including: At least one abnormal signal from among access control abnormality monitoring, flood monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring and input voltage abnormality monitoring; The environmental status of the PCS charging and discharging equipment has not changed, including: Each normal signal in access control abnormality monitoring, flood monitoring, emergency stop monitoring, smoke monitoring, bus voltage monitoring and input voltage abnormality monitoring; The switch module is configured accordingly according to the abnormal signal or the normal signal.

3. The protection method for PCS charging and discharging equipment according to claim 1, characterized in that: When the environmental state of the PCS charging and discharging equipment changes, the following steps are also included: When the switch module is in a closed state, when the environmental state of the PCS charging and discharging equipment changes, the delay configuration switch module is disconnected.

4. The protection method for PCS charging and discharging equipment according to claim 1, characterized in that: Before outputting a closing signal according to the charge and discharge start instruction or outputting a disconnecting signal according to the charge and discharge stop instruction, the following steps are also included: Configuring the switch module to be normally open and to detect two power-on states, and determining whether the two power-on states are in a normal state; The first power-on state is in a normal state, and according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed, the PCS module is triggered to start, so as to increase the voltage value of the bus to a preset voltage value; The second switch state is in a normal state, and the switch module is configured to be disconnected according to the monitoring information of whether the environmental state of the PCS charging and discharging equipment has changed.

5. The protection method for PCS charging and discharging equipment according to claim 4, characterized in that: When at least one of the two power-on states is in an abnormal state, the switch module is configured to disconnect and / or output a first alarm message.

6. The protection method for PCS charging and discharging equipment according to claim 4, characterized in that: The detecting of the two power-on states and judging whether the two power-on states are in a normal state comprises the following steps: Generate a first power-on signal and a second power-on signal corresponding to the two power-on states, and determine whether the first power-on signal and the second power-on signal are normal; According to whether the first power-on signal and the second power-on signal are normal, the receiving of monitoring information of whether the environmental state of the PCS charging and discharging equipment is changed is respectively performed.

7. The protection method for PCS charging and discharging equipment according to claim 4, characterized in that: After the PCS module is triggered to start, the following steps are also included: Obtaining a start signal of the PCS module, and determining whether the start signal is in a normal state; When the start signal is normal, outputting a closing signal according to the charge and discharge start instruction, or outputting a disconnecting signal according to the charge and discharge stop instruction; When the start signal is abnormal, the PCS module is restarted.

8. The protection method for PCS charging and discharging equipment according to claim 1, characterized in that: It also includes obtaining the voltage value of the bus; When the voltage value of the bus is not less than a set threshold, outputting a closing signal according to a charge and discharge start instruction, or outputting a disconnecting signal according to a charge and discharge stop instruction; When the voltage value of the bus is less than a set threshold, the voltage value of the bus is acquired again and / or a second alarm message is output.

9. The protection method for PCS charging and discharging equipment according to claim 8, characterized in that: The duration of the voltage value of the bus being less than the set threshold is within a preset time, and the step of obtaining the voltage value of the bus again is executed; When the duration that the voltage value of the bus is less than the set threshold reaches or exceeds the preset time, the output of the second alarm information is executed.

10. A protection device for PCS charging and discharging equipment, characterized in that: include: Monitoring module, used to monitor whether the environmental status of the PCS charging and discharging equipment has changed; A software control module, used to output a closing signal according to a charge and discharge start instruction, or output a disconnection signal according to a charge and discharge stop instruction; The hardware control module is used to configure the switch module to close when the environmental state of the PCS charging and discharging device does not change and receives the closing signal, so that the load module and the bus are connected through the switch module; when the environmental state of the PCS charging and discharging device changes, or receives the disconnection signal, configure the switch module to disconnect, so that the load module and the bus are blocked by the switch module.

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