CN-119291504-B - PCS-based multi-battery non-isolation insulation detection system, method, medium, program product and terminal

CN119291504BCN 119291504 BCN119291504 BCN 119291504BCN-119291504-B

Abstract

The invention provides a PCS-based multi-battery non-isolation insulation detection system, a method, a medium, a program product and a terminal, wherein a charging pile is formed by using PCS to charge and discharge a battery of a power exchange station, and the battery insulation detection is closed after the insulation detection is respectively carried out before the battery and the charging pile are interacted, then the PCS charging pile is used for executing global direct current loop insulation detection, and meanwhile, each direct current loop is subjected to leakage current detection.

Inventors

GUO PENG
WANG SHOUKANG
SUN MINGXIANG
MA JIE
LV FENG
CAI NING

Assignees

上海融和智电新能源有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (9)

1. The multi-battery non-isolation insulation detection system based on PCS is characterized by comprising a plurality of groups of PCS non-isolation charge-discharge devices and battery units which are arranged in pairs, wherein the interaction process of each group of PCS non-isolation charge-discharge devices and the battery units comprises the following steps: After receiving a charging instruction, the PCS non-isolated charging and discharging equipment sends a wake-up message to the battery unit so as to start a charging and discharging time sequence of the current round; the battery unit continuously receives the awakening message, and after receiving the awakening message, the first insulation detection of the battery unit end is started, and then the battery unit and the PCS non-isolated charging and discharging equipment start a handshake flow; The process of generating a corresponding first detection result by the battery unit based on the detection result of the first insulation detection and closing the first insulation detection comprises the steps of generating a third message by the battery unit as a first detection result if the detection result of the first insulation detection is not passed, transmitting the third message to the PCS non-insulation charge-discharge device, and terminating the charge-discharge time sequence of the current round, generating a fourth message by the battery unit as a first detection result if the detection result of the first insulation detection is passed, and transmitting the fourth message to the PCS non-insulation charge-discharge device; And responding to the success of the handshake flow, continuously receiving the first detection result by the PCS non-isolated charge-discharge equipment, if the first detection result is passed, starting a second ground edge detection of the PCS non-isolated charge-discharge equipment end, and executing a circuit closing operation after the second ground edge detection is passed so as to execute non-isolated charge-discharge operation, and simultaneously executing third insulation detection of a charge-discharge loop until the non-isolated charge-discharge operation is finished.
2. The PCS-based multi-battery non-isolation insulation detection system of claim 1, wherein initiating a handshake procedure between the battery cell and the PCS non-isolation charge-discharge device comprises: The PCS non-isolated charge-discharge device sends a first message to the battery unit in a preset period, the battery unit continuously receives the first message, the battery unit sends a second message to the PCS non-isolated charge-discharge device in the preset period after receiving the first message, the PCS non-isolated charge-discharge device continuously receives the second message, and when the PCS non-isolated charge-discharge device receives the second message sent back by the battery unit in the preset time, the handshake process is successful.
3. The PCS-based multi-battery non-isolation insulation detection system of claim 1, further comprising performing the following interaction process if the PCS non-isolation charging and discharging device does not receive a fourth message sent by the battery unit within a preset time: And the PCS non-isolated charge-discharge equipment judges whether the non-isolated charge-discharge operation is finished, if so, sends a charge completion signal to the battery unit, otherwise, terminates the charge-discharge time sequence of the current round and continuously waits for the charge instruction.
4. The PCS-based multi-battery non-isolation insulation detection system of claim 2 wherein if the PCS non-isolation charging and discharging device fails to receive the second message sent back by the battery unit within a preset time, the handshake process fails, and the system further performs the following interaction process: Responding to the failure of the handshake flow, and executing isolated charging and discharging operation by the battery unit; And responding to the failure of the handshake flow, the PCS non-isolated charge-discharge equipment judges whether the isolated charge-discharge operation is executed, if so, a charge completion signal is sent to the battery unit, otherwise, the charge-discharge time sequence of the current round is terminated, and the charge instruction is continuously waited.
5. A PCS-based multi-battery non-isolation insulation detection method, wherein the method is applied to the PCS non-isolation charging and discharging device of the PCS-based multi-battery non-isolation insulation detection system as claimed in claim 1, and the method comprises: After receiving a charging instruction, sending a wake-up message to a battery unit to start a charging and discharging time sequence of the current round; And responding to the successful handshake flow, continuously receiving the first detection result, if the first detection result is passed, starting a second ground edge detection of the PCS non-isolated charging and discharging equipment end, and executing a circuit closing operation after the second ground edge detection is passed so as to execute the non-isolated charging and discharging operation, and simultaneously executing a third insulation detection of a charging and discharging loop until the non-isolated charging and discharging operation is finished.
6. The PCS-based multi-battery non-isolation insulation detection method applied to the battery unit of the PCS-based multi-battery non-isolation insulation detection system of claim 1, the method comprising: Continuously receiving a wake-up message, and starting a first insulation detection of a battery unit end after receiving the wake-up message; And responding to the success of the handshake flow, generating a corresponding first detection result based on the detection result of the first insulation detection, sending the first detection result to the PCS non-isolated charging and discharging equipment, and closing the first insulation detection.
7. A computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the PCS-based multi-cell non-isolation insulation detection method of any one of claims 5 or 6.
8. A computer program product comprising computer program code embodied therein, which when run on a computer causes the computer to implement the PCS-based multi-cell non-isolation insulation detection method as claimed in any of claims 5 or 6.
9. An electronic terminal comprising a memory, a processor, and a computer program stored on the memory, wherein the processor executes the computer program to implement the PCS-based multi-battery non-isolation insulation detection method of any one of claims 5 or 6.

Description

PCS-based multi-battery non-isolation insulation detection system, method, medium, program product and terminal Technical Field The present invention relates to the field of insulation detection, and in particular, to a PCS-based multi-battery non-isolated insulation detection system, method, medium, program product, and terminal. Background In the fields of multi-battery energy storage and electric energy management, with the rapid development of electric vehicles and renewable energy sources, energy exchange and control technologies between batteries and a power grid are increasingly attracting attention. However, there are significant drawbacks to the prior art that limit the efficient use of multi-cell systems. Most of the current systems use unidirectional AC/DC isolation modules for battery charging, although the efficiency peaks up to 95%, such unidirectional modules severely limit the flexibility of the system, especially in terms of switching capability between grid-connected and off-grid. Meanwhile, the unidirectional AC/DC module commonly adopted by the power exchange station is low in efficiency and cannot perform reverse power grid interaction. This mode affects the overall efficiency and functionality of the system. Furthermore, standard transformers do not meet the dynamic power requirements of multi-cell systems. Therefore, a specially designed multi-winding special transformer must be used, thereby raising the overall transformer cost by about 50%. Although the bi-directional AC/DC isolation module can achieve 95% efficiency, its high price limits its wide application in the market, further exacerbating the cost and efficiency contradiction. In addition, when multi-battery systems are connected in parallel and combined with PCS charging piles, mutual interference of battery insulation detection balance bridges causes false reduction of insulation detection resistance values, increasing complexity and affecting reliability of the system. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention is directed to providing a PCS-based multi-battery non-isolated insulation detection system, method, medium, program product and terminal, for solving the problems in the prior art that the unidirectional AC/DC isolation module has insufficient flexibility, the standard transformer cannot be parallel grid-connected or off-grid powered through the PCS, and the bidirectional AC/DC module has high cost and the multi-battery system needs a special multi-winding transformer. In order to achieve the above and other related objects, a first aspect of the present invention provides a multi-battery non-isolated insulation detection system based on a PCS, where the system includes a plurality of sets of PCS non-isolated charge-discharge devices and battery units, each set of PCS non-isolated charge-discharge devices and battery units, and the interaction process between each set of PCS non-isolated charge-discharge devices and battery units includes that the PCS non-isolated charge-discharge devices send a wakeup message to the battery units after receiving a charge command to start a charge-discharge time sequence of a current round, the battery units continuously receive the wakeup message, and after receiving the wakeup message, a first insulation detection at a battery unit end is started, then the battery units and the PCS non-isolated charge-discharge devices start a handshake process, and in response to success of the handshake process, the battery units generate a corresponding first detection result based on a detection result of the first insulation detection, send the first detection result to the PCS non-isolated charge-discharge devices, and close the first insulation detection is successful, in response to success of the PCS non-isolated charge-discharge devices receive the first detection result, and if the PCS non-isolated charge-discharge devices continuously receive the first detection result, and if the PCS non-isolated charge-discharge operation is performed by the PCS non-isolated charge-discharge devices through the first insulation detection circuit, and the first insulation detection operation is performed at the end, and the closed operation is performed at the end. In some embodiments of the first aspect of the present invention, the process of starting a handshake procedure between the battery unit and the PCS non-isolated charging and discharging device includes that the PCS non-isolated charging and discharging device sends a first message to the battery unit in a preset period while the battery unit continuously receives the first message, after the battery unit receives the first message, sends a second message to the PCS non-isolated charging and discharging device in a preset period while the PCS non-isolated charging and discharging device continuously receives the second message, and when the PCS non-isolated charging and discharg