A fusion type energy storage all-in-one machine control system and method

Abstract

This disclosure relates to an integrated energy storage system control system and method, belonging to the field of energy storage management technology. The integrated energy storage system control system includes: a main control module, which includes a first control unit and a second control unit connected in communication. The first control unit is used to generate a current control signal based on at least one of the current and voltage of the energy storage system, and the second control unit is used to generate an energy storage battery management signal based on the energy storage battery information of the energy storage system and an energy storage management signal based on the grid information of the energy storage system; and an execution module, which is connected in communication with the main control module. The execution module is used to receive the current control signal, the energy storage battery management signal, and the energy storage management signal sent by the main control module, and to execute corresponding actions based on the current control signal, the energy storage battery management signal, and the energy storage management signal. This integrated energy storage system control system has high response efficiency and collaborative optimization capability, ensuring the stability and operating efficiency of the energy storage system.

Description

Technical Field

[0001] This disclosure relates to the field of energy storage management technology, and more specifically, to an integrated energy storage control system and method. Background Technology

[0002] Existing integrated energy storage systems employ three independent control systems: a Battery Monitoring and Management System (BMS), a Power Conversion System (PCS), and an Energy Management System (EMS). Each system utilizes its own independent hardware architecture and software algorithms, along with specific communication protocols, to achieve its respective functions. This approach offers flexibility and scalability, reducing construction, operation, and maintenance costs, and adapting to energy storage needs of varying scales. However, the three independent control systems (BMS, PCS, and EMS) suffer from low system response efficiency and difficulties in collaborative optimization. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides an integrated energy storage system control system and method.

[0004] In a first aspect, this disclosure provides an integrated energy storage system control system, the integrated energy storage system control system comprising: The main control module includes a first control unit and a second control unit connected by communication. The first control unit is used to generate a current control signal based on at least one of the current and voltage of the energy storage system. The second control unit is used to generate an energy storage battery management signal based on the energy storage battery information of the energy storage system and to generate an energy storage management signal based on the grid information of the energy storage system. An execution module is communicatively connected to the main control module. One end of the execution module is connected to the energy storage battery of the energy storage system, and the other end is connected to the power grid transmission cable. The execution module is used to receive the current control signal, the energy storage battery management signal, and the energy storage management signal sent by the main control module, and to perform corresponding actions based on the current control signal, the energy storage battery management signal, and the energy storage management signal.

[0005] Optionally, the second control unit is further configured to generate a clock reference signal, and the first control unit is further configured to receive the clock reference signal generated by the second control unit.

[0006] Optionally, the execution module includes a first circuit, a second circuit, and a third circuit connected in sequence. The first circuit is connected to the power grid transmission cable at one end, and the third circuit is connected to the DC bus of the energy storage battery. The first circuit is used to control the switching on and off of the input AC power, the second circuit is used to control the conversion between AC and DC power, and the third circuit is used to control the switching on and off of the charging and discharging circuit of the energy storage battery.

[0007] Optionally, the first circuit includes an AC disconnect switch Q1, an AC main contactor KM8, an AC precharge relay KM7, AC precharge resistors R1, R2, R3, and a fuse FU3. One end of the AC disconnect switch Q1 is connected to the power grid transmission cable, and the other end is connected to one end of the AC main contactor KM8. The other end of the AC main contactor KM8 is connected to one end of the fuse FU3, and the other end of the fuse FU3 is connected to the second circuit. The AC precharge relay KM7 and the AC precharge resistors R1, R2, R3 are connected in series and then in parallel across the AC main contactor KM8.

[0008] Optionally, the second circuit includes a power conversion module U1 and a capacitor C1. One end of the power conversion module U1 is connected to the fuse FU3, and the other end is connected to the DC bus of the energy storage battery. The capacitor C1 is connected in parallel at the connection between the power conversion module U1 and the DC bus.

[0009] Optionally, the third circuit includes a main positive contactor KM1, a main negative contactor KM2, a precharge relay KM3, a bus discharge relay KM4, a precharge resistor R4, a fuse FU1, a fuse FU2, and a circuit breaker QF1. The DC bus includes a DC bus WB1 and a DC bus WB2. One end of the DC bus WB1 is connected to the positive terminal of the energy storage battery, and the other end is connected to the power conversion module U1. One end of the DC bus WB2 is connected to the negative terminal of the energy storage battery, and the other end is connected to the power conversion module U1. The first switch of the circuit breaker QF1, the fuse FU1 and the main positive contactor KM1 are connected in series on the DC bus WB1 in sequence, and the second switch of the circuit breaker QF1, the fuse FU2 and the main negative contactor KM2 are connected in series on the DC bus WB2 in sequence.

[0010] Optionally, the execution module further includes a fourth circuit, which is communicatively connected to the second control unit. The fourth circuit includes a voltage acquisition branch, a current acquisition branch, and a temperature acquisition branch. The voltage acquisition branch is used to acquire the voltage at the connection side of the DC bus WB1 and the energy storage battery. The current acquisition branch is used to acquire the current at the connection side of the DC bus WB2 and the energy storage battery. The temperature acquisition branch is used to acquire the temperatures at the connection side of the DC bus WB2 and the energy storage battery, the pre-charge resistor R4, and the AC pre-charge resistors R1, R2, and R3, respectively.

[0011] Optionally, the main control module is also used to generate operating information of the energy storage system; The integrated energy storage control system also includes a centralized control module, which is communicatively connected to the main control module and is used to receive the operating information transmitted by the main control module in order to monitor the operation of the energy storage system.

[0012] Optionally, the integrated energy storage control system further includes a slave control module, which is communicatively connected to the second control unit and electrically connected to the energy storage battery. The slave control module is used to collect information from the energy storage battery and send the information to the second control unit. The second control unit is used to generate a management signal for the energy storage battery based on the information.

[0013] Optionally, the integrated energy storage control system further includes an environmental monitoring module, which is communicatively connected to the second control unit. The environmental monitoring module is used to collect grid information of the energy storage system and send the grid information to the second control unit. The second control unit is used to generate the energy storage management signal based on the grid information.

[0014] Secondly, this disclosure provides a method for controlling an integrated energy storage unit, applied to the integrated energy storage unit control system provided in the first aspect, the method comprising: A current control signal is generated based on at least one of the current and voltage of the energy storage system; Energy storage battery management signals are generated based on the energy storage battery information of the energy storage system, and energy storage management signals are generated based on the power grid information of the energy storage system. The corresponding actions are performed based on the current control signal, the energy storage battery management signal, and the energy storage management signal.

[0015] The above technical solution integrates the control of the energy storage system into the first control unit and the second control unit, reducing data transmission links and allowing the execution unit to directly control the energy storage system by executing the corresponding control signals. This ensures the timeliness and accuracy of the control actions, improves the response efficiency and collaborative optimization capability of the integrated energy storage control system, and thus guarantees the stability and operating efficiency of the energy storage system.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a structural block diagram of an integrated energy storage control system according to an exemplary embodiment.

[0018] Figure 2 This is an example diagram of the architecture of an execution module shown according to an embodiment of the present disclosure.

[0019] Figure 3 This is a schematic diagram of the circuit structure of the execution module shown according to an embodiment of the present disclosure.

[0020] Figure 4 This is a schematic diagram of the circuit structure of the current acquisition circuit in the execution module according to an embodiment of the present disclosure.

[0021] Figure 5 This is a schematic diagram of the connection structure of the centralized control module according to an embodiment of the present disclosure.

[0022] Figure 6 This is a schematic diagram of the connection structure of the slave control module according to an embodiment of the present disclosure.

[0023] Figure 7 This is a schematic diagram of the connection structure of an environmental monitoring module according to an embodiment of the present disclosure.

[0024] Figure 8 This is a flowchart illustrating an integrated energy storage control method according to an exemplary embodiment. Detailed Implementation

[0025] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0026] In the description of this disclosure, it should be noted that the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0028] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0029] Most existing integrated energy storage systems employ three independent control systems: BMS (Battery Management System), PCS (Power Control System), and EMS (Energy Management System). Each system utilizes its own independent hardware architecture and software algorithms, along with specific communication protocols, to achieve its functions. The BMS is the battery management system, used for functions such as battery balancing. The PCS is the energy storage converter, used to regulate the output voltage, frequency, and power of the energy storage system to meet grid connection requirements and battery charging and discharging needs. The EMS is the energy management system, which collects information from the grid, load, and batteries by connecting various sensors and actuators, and formulates operating strategies for the energy storage system based on this information, achieving functions such as peak shaving, load tracking, and backup power. However, the independent operation of the three systems (BMS, PCS, and EMS) leads to problems such as low system efficiency, difficulty in collaborative optimization, complex data consistency maintenance, high maintenance difficulty, and high costs.

[0030] To address the aforementioned issues, this disclosure proposes an integrated energy storage system control system that can be applied to energy storage systems.

[0031] Figure 1 This is an exemplary embodiment illustrating an integrated energy storage control system 100. This system can be applied to the overall monitoring and management of energy storage systems to enable current interaction between the energy storage system and the external power grid, achieving effective storage and release of electrical energy. For example... Figure 1As shown, the integrated energy storage control system 100 includes a main control module 110, which includes a first control unit 111 and a second control unit 112 connected in communication. The first control unit 111 generates a current control signal based on at least one of the current and voltage of the energy storage system. The second control unit 112 generates an energy storage battery management signal based on the energy storage battery information of the energy storage system and generates an energy storage management signal based on the grid information of the energy storage system. The integrated energy storage control system 100 also includes an execution module 120, which is connected in communication with the main control module 110. One end of the execution module 120 is connected to the energy storage battery 160 of the energy storage system, and the other end is connected to the grid transmission cable. The execution module 120 receives the current control signal, the energy storage battery management signal, and the energy storage management signal sent by the main control module 110, and performs corresponding actions based on the current control signal, the energy storage battery management signal, and the energy storage management signal.

[0032] In this embodiment, the first control unit 111 and the second control unit 112 each use a PCB board, and the two PCB boards are integrated on a single fused motherboard. The main control module 110, which includes the first control unit 111 and the second control unit 112, adopts this fused motherboard structure. The first control unit 111 and the second control unit 112 are communicatively connected, and the communication connection can be achieved by one or more of an internal bus, a serial communication interface, or a parallel communication interface to realize data interaction between the two.

[0033] The first control unit 111 generates a current control signal based on at least one of the current and voltage of the energy storage system, wherein the current and voltage of the energy storage system are acquired by a sampling circuit connected to the first control unit 111. This sampling circuit can be a sampling circuit including current sensors and voltage sensors installed inside the energy storage system, or a sampling circuit including sampling resistors and capacitors installed in the internal loop of the energy storage system. The current and voltage acquired by the sampling circuit are the current and voltage values ​​at at least one location in the energy storage system: across the energy storage battery, in the DC bus, or at the output terminals of the energy storage system. The current control signal generated by the first control unit 111 includes the switching state signal corresponding to the power regulation unit or current regulation unit in the energy storage system, to control the operating state of the power regulation unit or current regulation unit, thereby controlling the AC / DC conversion and power conversion of the current in the energy storage system.

[0034] The second control unit 112 generates energy storage battery management signals based on energy storage battery information of the energy storage system. This energy storage battery information includes at least one of the following: voltage, current, and temperature of a single battery cell. This information can be acquired through a single battery sampling circuit connected to the second control unit 112. The energy storage battery management signals may include charge / discharge control signals for the energy storage battery. For example, if the voltage value received by the second control unit 112 is lower than a preset voltage value, the second control unit 112 generates a charging control signal. The second control unit 112 also generates energy storage management signals based on grid information of the energy storage system. This grid information includes at least one of the following operating status parameters: grid frequency, voltage, and power. The energy storage management signals include charge / discharge time control signals for the energy storage batteries in the energy storage system and energy interaction control signals between the energy storage system and the grid. For example, if the second control unit 112 receives a low peak voltage from the grid, it generates a corresponding discharge management signal.

[0035] The execution module 120 is communicatively connected to the main control module 110 to receive current control signals, energy storage battery management signals, and energy storage management signals generated by the main control module 110. The execution module 120 is connected between the energy storage battery and the external power grid transmission cable, enabling it to perform corresponding actions based on the received signals to control the on / off state of the circuit between the energy storage battery and the power grid. The execution module 120 can be composed of power electronic devices, such as inverters, converters, or switching devices. In one specific embodiment, when the execution module 120 receives a charging management signal, it controls the flow of electrical energy from the power grid to the corresponding branch of the energy storage battery 160; when it receives a discharging management signal, it controls the flow of electrical energy from the energy storage battery 160 to the corresponding branch of the power grid. The actions of the execution module 120 may include, but are not limited to, controlling power conversion, switching on / off states, and adjusting energy flow.

[0036] Through the aforementioned integrated energy storage control system 100, the main control module 110 integrates current and voltage control, energy storage battery management, and grid management within the energy storage system into the first control unit 111 and the second control unit 112. Data interaction between the control units is achieved through a communication connection between the first control unit 111 and the second control unit 112. This avoids the information transmission delays and coordination obstacles inherent in existing independent control systems, improving the overall response efficiency of the energy storage system. Simultaneously, the execution module 120 directly receives and executes the instructions from the main control module 110, ensuring the timeliness and accuracy of control actions and resolving the problems of low system response efficiency and difficulty in collaborative optimization in existing integrated energy storage systems.

[0037] As an optional implementation, the second control unit 112 is also used to generate a clock reference signal, and the first control unit 111 is also used to receive the clock reference signal generated by the second control unit 112.

[0038] In one embodiment of the present disclosure, since the first control unit 111 and the second control unit 112 are two separate PCBs, to ensure that the first control unit 111 and the second control unit 112 can maintain precise timing consistency when processing data and generating control signals, the first control unit 111 receives the clock reference signal generated by the second control unit 112. The second control unit 112 can be generated by an internal crystal oscillator or a phase-locked loop circuit. The first control unit 111 can receive the clock reference signal through a synchronization signal line or a communication bus between the first control unit 111 and the second control unit 112, and synchronize its internal clock with the clock reference signal. Through the clock reference signal generated by the second control unit 112 and received by the first control unit 111, a unified clock reference is formed inside the main control module 110. The unified clock reference ensures the timing consistency of data interaction between the first control unit 111 and the second control unit 112, and avoids signal processing delay problems caused by clock asynchronization. The overall coordination ability of the integrated energy storage control system of the fusion type is enhanced through the unified clock reference.

[0039] In some other embodiments of the present disclosure, a set of DI and DO data points are also connected between the first control unit 111 and the second control unit 112. When the first control unit 111 determines that there is a serious fault, it will send a signal to the corresponding DI data interface of the second control unit 112 through its DO data interface. When the second control unit 112 determines that there is a serious fault, it will send a signal to the corresponding DI data interface of the first control unit 111 through the DO data interface of the second control unit 112. Thus, the communication between the first control unit 111 and the second control unit 112 during serious faults is ensured to be stable, and timely linkage response to serious faults is achieved. For the general alarms and faults of the first control unit 111 and the second control unit 112, the interaction of alarm and fault signals is still carried out through the communication bus between the first control unit 111 and the second control unit 112.

[0040] As Figure 2 shown, as an optional implementation manner, the execution module 120 includes a first circuit 121, a second circuit 122, and a third circuit 123 connected in sequence. The end of the first circuit 121 is connected to the power grid transmission cable, and the third circuit 123 is connected to the DC bus of the energy storage battery (160). Among them, the first circuit 121 is used to control the on and off of the input alternating current, the second circuit 122 is used to control the conversion of alternating current and direct current, and the third circuit 123 is used to control the on and off of the charge and discharge circuit of the energy storage battery 160.

[0041] The first circuit 121 serves as the interface circuit between the execution module 120 and the external power grid, with its end directly connected to the power grid transmission cable. The first circuit 121 primarily controls the switching of AC power between the energy storage battery 160 and the external power grid. The first circuit 121 receives control signals from the main control module 110 and performs connection or disconnection actions based on these signals. The connection or disconnection with the external power grid is achieved through the switching of the first circuit 121. The first circuit 121 may include one or more power electronic devices such as a high-power AC contactor, a relay, or a circuit breaker with overcurrent protection.

[0042] The second circuit 122 is connected in series between the first circuit 121 and the third circuit 123, and is mainly used for AC / DC conversion. Based on the current control signal received from the main control module 110, the second circuit 122 converts AC power from the grid into DC power to charge the energy storage battery 160; or converts DC power from the energy storage battery into AC power to supply power to the grid or AC loads. The second circuit 122 may include a power converter, or an H-bridge or multi-level inverter topology, thereby achieving efficient, stable, and bidirectional AC / DC energy conversion.

[0043] The third circuit 123 is the connection circuit between the execution module and the energy storage battery 160. The energy input and output terminals of the energy storage battery 160 are connected to a DC bus, and the third circuit 123 is connected to this DC bus. The third circuit 123 performs on / off operations according to the energy storage battery management signal sent by the main control module 110, thereby realizing the charging and discharging control of the energy storage battery 160 by the main control module 110. The third circuit 123 may include one or more power electronic devices such as DC contactors and DC circuit breakers, or it may include a DC switching circuit composed of power semiconductor devices such as IGBTs and MOSFETs.

[0044] The connection stability between the energy storage system and the external power grid is ensured by three sequentially connected circuits: 121, 122, and 123. Circuit 121 directly connects to the external power grid transmission cable, achieving effective isolation and on / off control of AC input and output. Circuit 122 converts AC to DC power, ensuring accurate and low-loss conversion. Circuit 123 directly connects to the DC bus of the energy storage battery 160, enabling control of charging and discharging and enhancing battery safety. Through the functional allocation of these three circuits, the main control module 110 effectively controls the current input and output of the energy storage system. The connection of these three circuits ensures that the specific actions corresponding to various control and management signals of the energy storage system by the main control module 110 are all implemented within the same control loop, responding and acting synchronously. This solves the problems of poor response efficiency and asynchronous control actions caused by individual control in existing independent systems, improving the smoothness and efficiency of the energy storage system's operation.

[0045] like Figure 3 As shown, in one optional implementation, the first circuit 121 includes an AC disconnect switch Q1, an AC main contactor KM8, an AC precharge relay KM7, AC precharge resistors R1, R2, R3, and a fuse FU3. One end of the AC disconnect switch Q1 is connected to the power grid transmission cable, and the other end is connected to one end of the AC main contactor KM8. The other end of the AC main contactor KM8 is connected to one end of the fuse FU3, and the other end of the fuse FU3 is connected to the second circuit 122. The AC precharge relay KM7 and the AC precharge resistors R1, R2, and R3 are connected in series and then in parallel across the AC main contactor KM8.

[0046] The AC isolating switch Q1 provides physical isolation to the first circuit 121. During maintenance of the integrated energy storage control system 100, the AC isolating switch Q1 is disconnected for safe isolation. The AC main contactor KM8 controls the on / off state of the main circuit under normal operating conditions. The fuse FU3 is an overcurrent protection device that cuts off the current in case of a fault. To effectively suppress inrush current, the AC precharge relay KM7 and AC precharge resistors R1, R2, and R3 are connected in series and then in parallel across the AC main contactor KM8. The AC precharge resistors R1, R2, and R3 limit the charging current during the initial system startup, while the AC precharge relay KM7 controls its connection and disconnection. The first circuit 121 achieves optimized control of the AC power on / off process in the integrated energy storage control system 100. In one specific embodiment, during system startup or initial grid connection, the AC isolating switch Q1 is closed. To prevent direct grid connection from impacting the components in the second circuit 122, the main control module 110 sends a control signal to close the AC pre-charge relay KM7 first, and open the AC main contactor KM8. The AC pre-charge resistors R1, R2, and R3 are connected in series in the circuit. The AC pre-charge resistors R1, R2, and R3 effectively limit the initial charging current, ensuring a smooth pre-charge of the system, suppressing surge current generation, and protecting the first circuit 121 and the second circuit 122 from impact damage. After the pre-charge process is complete, when the main control module 110 determines that the voltage of the second circuit 122 has reached a preset value, it sends a control signal to close the AC main contactor KM8, short-circuit the AC pre-charge resistors R1, R2, and R3, and turn on the main circuit, ensuring the efficiency and stability of energy transmission. Fuse FU3 provides overcurrent protection. In the event of a short circuit or severe overload, fuse FU3 can quickly melt and interrupt the fault current, further ensuring the operational safety of the integrated energy storage control system 100. This improves the reliability, stability, and safety of the integrated energy storage control system 100 when connected to the grid.

[0047] As an optional implementation, the second circuit 122 includes a power conversion module U1 and a capacitor C1. One end of the power conversion module U1 is connected to the fuse FU3, and the other end is connected to the DC bus of the energy storage battery 160. The capacitor C1 is connected in parallel at the connection between the power conversion module U1 and the DC bus.

[0048] The power conversion module U1 primarily converts AC and DC power, rectifying the AC power from the first circuit 121 into DC power for transmission to the third circuit 123, or inverting the DC power from the third circuit 123 into AC power. It also includes voltage and current regulation functions. The power conversion module U1 can be implemented using various topologies, including a bidirectional AC / DC converter. It can receive control signals from the main control module 110 and perform bidirectional control based on these signals to meet the operational requirements of the energy storage system. Capacitor C1 absorbs transient energy and stabilizes the DC bus voltage. Capacitor C1 can be an electrolytic capacitor, film capacitor, or ceramic capacitor. In one specific embodiment, when the energy storage system is operating in charging mode, capacitor C1 stabilizes the rectified DC voltage, reducing disturbances and providing stable DC power to the energy storage battery 160. When the energy storage system is operating in discharging mode, capacitor C1 absorbs transient current surges generated during inversion, stabilizing the DC bus voltage and ensuring stable AC output from the power conversion module U1. The second circuit 122, composed of capacitor C1 and power conversion module U1, ensures the safety and stability of the AC / DC power conversion process of the energy storage system and improves the operating efficiency of the integrated energy storage control system.

[0049] As an optional implementation, the third circuit 123 includes a main positive contactor KM1, a main negative contactor KM2, a pre-charge relay KM3, a bus discharge relay KM4, a pre-charge resistor R4, fuses FU1 and FU2, and a circuit breaker QF1. The DC bus includes DC bus WB1 and DC bus WB2. One end of DC bus WB1 is connected to the positive terminal of the energy storage battery 160, and the other end is connected to the power conversion module U1. One end of DC bus WB2 is connected to the negative terminal of the energy storage battery 160, and the other end is connected to the power conversion module U1. The first switch of circuit breaker QF1, fuse FU1, and main positive contactor KM1 are connected in series on DC bus WB1. The second switch of circuit breaker QF1, fuse FU2, and main negative contactor KM2 are connected in series on DC bus WB2.

[0050] Among them, the main positive contactor KM1 and the main negative contactor KM2 are used to control the on and off of DC bus WB1 and DC bus WB2, thereby realizing the on and off control of the charging and discharging circuit of the energy storage battery 160.

[0051] The pre-charge relay KM3 and pre-charge resistor R4 work together to achieve a soft-start function when the energy storage battery 160 is connected to the DC bus. Before charging the energy storage battery 160, the main control module 110 first controls the pre-charge relay KM3 to close, the main positive contactor KM1 to open, and the main negative contactor KM2 to close, so that the DC power transmitted from the second circuit 122 first passes through the pre-charge resistor R4 and the pre-charge relay KM3 before charging the energy storage battery 160. The pre-charge resistor R4 is used to limit the pre-charge current to avoid the impact of the inrush current on the energy storage battery 160 in the early stage of charging.

[0052] The bus discharge relay KM4 is used to control the energy release on the DC bus. When the integrated energy storage control system shuts down, the main control module 110 sends a control signal to close the bus discharge relay KM4, releasing the residual charge on the DC bus.

[0053] Fuse FU1 and fuse FU2 are respectively installed on DC bus WB1 and DC bus WB2 to provide overcurrent protection. When the current on the DC bus exceeds a preset safety threshold, fuse FU1 or fuse FU2 will quickly melt, interrupting the fault current and thus protecting the energy storage battery 160, power conversion module U1, and first circuit 121 from damage caused by short circuits or overloads. Fuses FU1 and FU2 can be fast-acting fuses to interrupt the fault current in a very short time, or time-delay fuses to allow for short-term overloads to accommodate certain load characteristics with inrush currents.

[0054] Circuit breaker QF1 has a first switch and a second switch for rapid fault isolation of DC buses WB1 and WB2. The first switch of circuit breaker QF1 is connected in series with DC bus WB1, and the second switch is connected in series with DC bus WB2. When a fault is detected in the system, circuit breaker QF1 can quickly disconnect its first and second switches, thereby disconnecting the entire third circuit 123, improving the safety and reliability of the energy storage integrated machine control system. Circuit breaker QF1 can be a dedicated DC circuit breaker or an intelligent circuit breaker.

[0055] The main control module 110, through the third circuit 123, can effectively and safely control the charging and discharging of the energy storage battery 160, ensuring that the energy storage system operates stably, safely, and efficiently under various operating conditions.

[0056] As an optional implementation, the execution module 120 further includes a fourth circuit 124, which is communicatively connected to the second control unit 112. The fourth circuit 124 includes a voltage acquisition branch 1241, a current acquisition branch 1242, and a temperature acquisition branch 1243. The voltage acquisition branch 1241 is used to acquire the voltage at the connection side of the DC bus WB1 and the energy storage battery 160; the current acquisition branch 1242 is used to acquire the current at the connection side of the DC bus WB2 and the energy storage battery 160; and the temperature acquisition branch 1243 is used to acquire the temperatures at the connection side of the DC bus WB2 and the energy storage battery 160, the pre-charge resistor R4 side, and the AC pre-charge resistors R1, R2, and R3 sides, respectively.

[0057] The fourth circuit 124 is communicatively connected to the second control unit 112, sending the collected parameters such as current, voltage, and temperature to the second control unit 112. Specifically, the voltage acquisition branch 1241 can use a voltage divider resistor circuit with an analog-to-digital converter or a voltage sensor to measure the voltage at the connection side of the DC bus WB1 and the energy storage battery 160. The current acquisition branch 1242 can use a shunt resistor connected in series with the DC bus WB2 and a differential amplifier to measure the voltage across the shunt resistor, then convert it into a digital current value via an analog-to-digital converter and transmit it to the second control unit 112. Alternatively, a current sensor can be used to directly acquire the current at the connection side of the DC bus WB2 and the energy storage battery 160. The temperature acquisition branch 1243 can use a thermistor or a resistance temperature detector to acquire the temperature at the connection side of the DC bus WB2 and the energy storage battery 160, the pre-charge resistor R4 side, and the AC pre-charge resistors R1, R2, and R3 sides, and send the acquired temperature data to the second control unit 112. The fourth circuit 124 enables real-time acquisition of multi-dimensional operating parameters of the energy storage system, and timely feedback of current, voltage and temperature data to the second control unit 112, providing accurate real-time basis for the second control unit 112 to generate energy storage battery management signals and energy storage management signals.

[0058] In other embodiments of this disclosure, such as Figure 4 As shown, the current acquisition branch 1242 can use a shunt RS1, which is connected in series with the DC bus WB2 to detect the current flowing through the DC bus WB2 in real time. The shunt RS1 indirectly obtains the accurate value of the current flowing through it by measuring the voltage drop across its terminals, and acquires current signals at three locations, feeding these three current signals back to the second control unit 112. The shunt RS1 can be a high-precision manganese-copper alloy shunt or a Hall effect current sensor, etc.

[0059] In other embodiments of this disclosure, such as Figure 3 or Figure 4As shown, the first circuit 121 also includes a common-mode inductor L1 and a differential-mode inductor L2. The common-mode inductor L1 is connected in series between the AC disconnect switch Q1 and the AC main contactor KM8, and is used to suppress common-mode interference. The differential-mode inductor L2 is connected in series between the first circuit 121 and the second circuit 122, and is used to suppress differential-mode interference.

[0060] In other embodiments of this disclosure, the second control unit 112 receives current, voltage and temperature data collected by the fourth circuit 124 and sends the data to the first control unit 111. The first control unit 111 determines a current control signal based on the data and other control commands sent by the second control unit 112, and sends the current control signal to the second circuit 122. The second circuit 122 performs corresponding actions based on the current control signal.

[0061] like Figure 5 As shown, as an optional implementation, the main control module 110 is also used to generate operating information of the energy storage system. The integrated energy storage control system 100 also includes a central control module 130, which is communicatively connected to the main control module 110 and is used to receive operating information transmitted by the main control module 110 to monitor the operation of the energy storage system.

[0062] The operational information of the energy storage system includes at least one of the following: various status data, performance parameters, fault alarms, etc., generated by the energy storage system 100 during operation. The operational information may also include the operational status information of the execution module 120, which includes at least one of the following: insulation status, total voltage of the energy storage battery 160, total current of the energy storage battery 160, temperatures of AC pre-charge resistors R1, R2, and R3, temperature of pre-charge resistor R4, DC bus temperature, and feedback signals of the open / close positions of the main positive contactor KM1, main negative contactor KM2, pre-charge relay KM3, bus discharge relay KM4, AC pre-charge relay KM7, and AC main contactor KM8. The main control module 110 can acquire the above data through internal sensors or other monitoring modules, process and analyze it to generate this operational information. The centralized control module 130 is an independent monitoring module used to receive and process the operational information sent by the main control module 110, and to centrally monitor and manage the energy storage system based on the operational information. The centralized control module 130 can adopt a cloud computing or edge computing platform and communicate with the main control module 110 via a network. Alternatively, the centralized control module 130 can adopt an HMI-based local monitoring platform and communicate with the main control module 110 via Ethernet or serial communication. When using an HMI-based local monitoring platform, the centralized control module 130 can display the real-time operating parameters of the energy storage system through a graphical human-machine interface. This enables monitoring of the energy storage system's operating information, facilitating a better understanding of the system's operating status and improving response efficiency to emergencies. Monitoring through operating information directly generated by the main control module 110, rather than independent data acquisition, reduces system redundancy and improves the overall management efficiency and operational reliability of the integrated energy storage control system 100.

[0063] like Figure 6 As shown, as an optional implementation, the integrated energy storage control system 100 further includes a slave control module 140, which is communicatively connected to the second control unit 112 and electrically connected to the energy storage battery 160. The slave control module 140 is used to collect energy storage battery information and send the energy storage battery information to the second control unit 112. The second control unit 112 is used to generate energy storage battery management signals based on the energy storage battery information.

[0064] The energy storage battery information includes at least one of the cell voltage and battery temperature. The slave module 140 can be a microcontroller-based module, an embedded system, or a dedicated battery management slave module, capable of detailed, real-time acquisition of data from the energy storage battery 160. The slave module 140 and the second control unit 112 can communicate using various protocols and physical interfaces.

[0065] As an optional implementation, the slave control module 140 can accurately collect energy storage battery information corresponding to the energy storage battery 160 through a direct electrical connection with the energy storage battery 160. The slave control module 140 can be directly wired to the voltage sampling points, current shunt, and temperature sensor inside the energy storage battery 160. Alternatively, the slave control module 140 can be daisy-chained with the energy storage battery 160, with each module monitoring the voltage and temperature of its individual battery cells in series. The energy storage battery information collected by the slave control module 140, reflecting the current state and health status of the energy storage battery 160, includes at least one of the following: individual battery cell voltage, overall battery pack voltage or voltage of a specific battery module, charging / discharging current, battery cell temperature, module temperature, or ambient temperature of the battery compartment. By directly collecting energy storage battery information from the control module 140 and sending it to the second control unit 112 in a timely manner, the second control unit 112 is able to receive accurate and real-time energy storage battery management information and generate accurate energy storage battery management signals based on the energy storage battery management information, thereby improving the response efficiency of the integrated energy storage control system and thus improving the stability and safety of the energy storage battery 160.

[0066] like Figure 7 As shown, as an optional implementation, the integrated energy storage control system 100 also includes an environmental monitoring module 150. The environmental monitoring module 150 is communicatively connected to the second control unit 112. The environmental monitoring module 150 is used to collect grid information of the energy storage system and send the grid information to the second control unit 112. The second control unit 112 is used to generate energy storage management signals based on the grid information.

[0067] The environmental monitoring module 150 includes a power supply monitoring unit, which collects grid information from the energy storage system. This grid information includes at least one of the following: grid voltage, grid current, grid frequency, grid power, grid harmonic content, grid fault status, and grid dispatch instructions. The power supply monitoring unit can employ built-in voltage transformers, current transformers, frequency sensors, or grid-side smart meters, distribution automation terminals, etc. The power supply monitoring unit collects the grid information and sends it to the second control unit 112. The second control unit 112 receives the grid information, analyzes and processes it, and generates energy storage management signals. These signals include control signals for the charging and discharging time of the energy storage batteries in the energy storage system, as well as control signals for energy interaction between the energy storage system and the grid. In one specific embodiment, the second control unit 112 calculates the charging and discharging power, charging and discharging mode, grid-connected or off-grid switching instructions, etc., based on real-time grid load conditions, electricity price signals, grid frequency deviation, voltage fluctuations, and other information, combined with a preset operating strategy, and outputs these instructions as energy storage management signals. This enables 100% collaborative optimization of the integrated energy storage control system, improving the real-time response capability and operational efficiency of energy storage management, allowing the energy storage system to better adapt to grid demands and realize its value.

[0068] In some other embodiments of this disclosure, the environmental monitoring module 150 further includes a temperature and humidity control unit. This unit collects the external ambient humidity of the energy storage system and can regulate the external ambient humidity of the energy storage system through its own dehumidification function. This ensures the stable operation of the energy storage system 100.

[0069] In some other embodiments of this disclosure, the environmental monitoring module 150 further includes a temperature regulation unit, which collects the external ambient temperature of the energy storage system and regulates the external ambient temperature of the energy storage system through its own cooling function. This ensures the stable operation of the energy storage system 100.

[0070] In some other embodiments of this disclosure, the environmental monitoring module 150 further includes a fire-fighting linkage unit. This unit collects signals from the external environment of the energy storage system, including temperature, smoke, and combustible gas concentration, and outputs a fire alarm signal to the control module 110. In the event of a fire, the fire-fighting linkage unit can control the fire extinguishing device to extinguish the fire and open the fire safety valve, thereby ensuring the safety of the energy storage system 100.

[0071] Figure 8 This is an exemplary embodiment illustrating an integrated energy storage unit control method, applied to the integrated energy storage unit control system provided in the above embodiments. The integrated energy storage unit control method includes: S201. Generate a current control signal based on at least one of the current and voltage of the energy storage system.

[0072] The current and voltage values ​​are those at certain points in the circuit connecting the energy storage system's battery 160 to the external power grid, acquired through current or voltage sensors. The acquired current and voltage values ​​are input to the first control unit 111 in the main control module 110. Based on preset algorithms, such as proportional-integral-derivative (PID), fuzzy control, or model predictive control, the first control unit 111 analyzes and processes the current and voltage to generate current control signals for adjusting the power input and output of the energy storage system. In one specific embodiment, when the energy storage system needs to supply specific power to the grid, the first control unit 111 calculates the required current control signal based on real-time current and voltage data to ensure the stability and accuracy of the power output. The first control unit 111 can also integrate a high-precision data acquisition module to directly digitize analog signals and quickly generate current control signals through an internal digital signal processor or microcontroller to meet the system's response speed requirements.

[0073] S202. Generate energy storage battery management signals based on energy storage battery information of the energy storage system.

[0074] The energy storage battery information can be acquired by the slave control module 140, and includes at least one of the following data: voltage, current, and temperature of individual cells. The slave control module 140 sends the energy storage battery information to the second control unit 112. The second control unit 112 processes and analyzes the energy storage battery information using a preset battery management strategy, including overcharge protection, over-discharge protection, over-temperature protection, equalization management, and fault diagnosis, thereby generating an energy storage battery management signal. In one specific embodiment, when an overvoltage or overcurrent risk is detected in the energy storage battery 160, the second control unit 112 generates an energy storage battery management signal, which is sent to the execution module 120. The execution module 120 then cuts off the third circuit 123 to protect the energy storage battery 160. Furthermore, the second control unit 112 can optimize the charging and discharging strategy based on the state of charge and health status of the energy storage battery 160 to extend its lifespan.

[0075] S203. Generate energy storage management signals based on grid information from the energy storage system.

[0076] The grid information includes at least one of the following: grid voltage, grid current, grid frequency, grid power, grid harmonic content, grid fault status, and grid dispatch instructions. The grid information is collected by the environmental monitoring module 150 and then sent to the second control unit 112. The second control unit 112 comprehensively analyzes the received grid information according to preset energy storage operation strategies, such as peak shaving and valley filling, frequency and voltage regulation, reserve capacity, and grid-connected or off-grid switching, and generates corresponding energy storage management signals. For example, when the grid load peaks, the second control unit 112 generates an energy storage management signal requiring the energy storage system to discharge, based on electricity price information and load forecasts, to support the grid; while during periods of low grid load, it generates an energy storage management signal requiring the energy storage system to charge, to absorb excess power.

[0077] S204. Perform corresponding actions based on the current control signal, the energy storage battery management signal, and the energy storage management signal.

[0078] The execution module 120 is communicatively connected to the main control module 110, with one end connected to the energy storage battery 160 of the energy storage system and the other end connected to the power grid transmission cable. The execution module 120 receives current control signals, energy storage battery management signals, and energy storage management signals from the main control module 110. The execution elements inside the execution module 120, such as the power conversion module U1, AC disconnect switch Q1, AC main contactor KM8, main positive contactor KM1, and main negative contactor KM2, perform corresponding actions based on the current control signals, energy storage battery management signals, and energy storage management signals. For example, the current control signal is directly sent to the power conversion module U1 to regulate its AC / DC conversion process, achieving precise control of the charging and discharging current and voltage. The energy storage battery management signal controls the on / off switching of the main positive contactor KM1 and the main negative contactor KM2 to connect or disconnect the battery. The energy storage management signal can control the switching on and off of the AC disconnect switch Q1 and the AC main contactor KM8 to enable grid connection or off-grid operation of the energy storage system. In this way, the energy storage system can operate efficiently, safely, and stably under various operating conditions.

[0079] By integrating the signal generation and execution processes, the problems of low response efficiency and difficulty in collaborative optimization in existing energy storage systems are solved. Current control signals are generated based on at least one of the current and voltage of the energy storage system, ensuring the real-time performance and accuracy of the control signals and avoiding response delays caused by information lag or a single data source. Energy storage battery management signals are generated based on battery information, and energy storage management signals are generated based on grid information, allowing for specialized management of battery status and grid conditions respectively. This enhances the system's adaptability and reliability, avoiding coordination problems caused by mixed information. Executing corresponding actions based on each control signal achieves comprehensive signal utilization and unified execution, improving the collaborative optimization capability and response efficiency of the integrated energy storage control system. Multiple control signals are collaboratively generated by the first control unit 111 and the second control unit 112 in the main control module 110, and then uniformly executed by the execution module 120. This achieves close collaboration and optimized control among the various functional modules of the energy storage system, improving the overall operational efficiency and reliability of the energy storage system.

[0080] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0081] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0082] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A fusion-type integrated energy storage control system (100), characterized in that, The integrated energy storage control system (100) includes: The main control module (110) includes a first control unit (111) and a second control unit (112) connected by communication. The first control unit (111) is used to generate a current control signal based on at least one of the current and voltage of the energy storage system. The second control unit (112) is used to generate an energy storage battery management signal based on the energy storage battery information of the energy storage system and to generate an energy storage management signal based on the grid information of the energy storage system. An execution module (120) is communicatively connected to the main control module (110). One end of the execution module (120) is connected to the energy storage battery (160) of the energy storage system, and the other end is connected to the power grid transmission cable. The execution module (120) is used to receive the current control signal, the energy storage battery management signal, and the energy storage management signal sent by the main control module (110), and to perform corresponding actions based on the current control signal, the energy storage battery management signal, and the energy storage management signal.

2. The integrated energy storage control system (100) according to claim 1, characterized in that, The second control unit (112) is also used to generate a clock reference signal, and the first control unit (111) is also used to receive the clock reference signal generated by the second control unit (112).

3. The integrated energy storage control system (100) according to claim 1, characterized in that, The execution module (120) includes a first circuit (121), a second circuit (122), and a third circuit (123) connected in sequence. The first circuit (121) is connected to the power grid transmission cable at one end, and the third circuit (123) is connected to the DC bus of the energy storage battery (160). The first circuit (121) is used to control the switching on and off of the input AC power, the second circuit (122) is used to control the conversion between AC and DC power, and the third circuit (123) is used to control the switching on and off of the charging and discharging circuit of the energy storage battery (160).

4. The integrated energy storage control system (100) according to claim 3, characterized in that, The first circuit (121) includes an AC disconnect switch Q1, an AC main contactor KM8, an AC precharge relay KM7, AC precharge resistors R1, R2, R3, and a fuse FU3. One end of the AC disconnect switch Q1 is connected to the power grid transmission cable, and the other end is connected to one end of the AC main contactor KM8. The other end of the AC main contactor KM8 is connected to one end of the fuse FU3. The other end of the fuse FU3 is connected to the second circuit (122). The AC precharge relay KM7 and the AC precharge resistors R1, R2, R3 are connected in series and then connected in parallel across the two ends of the AC main contactor KM8.

5. The integrated energy storage control system (100) according to claim 4, characterized in that, The second circuit (122) includes a power conversion module U1 and a capacitor C1. One end of the power conversion module U1 is connected to the fuse FU3, and the other end is connected to the DC bus of the energy storage battery (160). The capacitor C1 is connected in parallel at the connection between the power conversion module U1 and the DC bus.

6. The integrated energy storage control system (100) according to claim 5, characterized in that, The third circuit (123) includes a main positive contactor KM1, a main negative contactor KM2, a precharge relay KM3, a bus discharge relay KM4, a precharge resistor R4, fuses FU1 and FU2, and a circuit breaker QF1. The DC bus includes DC bus WB1 and DC bus WB2. One end of DC bus WB1 is connected to the positive terminal of the energy storage battery (160), and the other end is connected to the power conversion module U1. One end of DC bus WB2 is connected to the negative terminal of the energy storage battery (160), and the other end is connected to the power conversion module U1. The first switch of the circuit breaker QF1, the fuse FU1, and the main positive contactor KM1 are connected in series on the DC bus WB1. The second switch of the circuit breaker QF1, the fuse FU2, and the main negative contactor KM2 are connected in series on the DC bus WB2.

7. The integrated energy storage control system (100) according to claim 6, characterized in that, The execution module (120) further includes a fourth circuit (124), which is communicatively connected to the second control unit (112). The fourth circuit (124) includes a voltage acquisition branch (1241), a current acquisition branch (1242), and a temperature acquisition branch (1243). The voltage acquisition branch (1241) is used to acquire the voltage at the connection side of the DC bus WB1 and the energy storage battery (160). The current acquisition branch (1242) is used to acquire the current at the connection side of the DC bus WB2 and the energy storage battery (160). The temperature acquisition branch (1243) is used to acquire the temperature at the connection side of the DC bus WB2 and the energy storage battery (160), the pre-charge resistor R4 side, and the AC pre-charge resistors R1, R2, and R3 side, respectively.

8. The integrated energy storage control system (100) according to any one of claims 1-7, characterized in that, The main control module (110) is also used to generate the operating information of the energy storage system; The integrated energy storage control system (100) further includes a central control module (130), which is communicatively connected to the main control module (110) and is used to receive the operating information transmitted by the main control module (110) to monitor the operation of the energy storage system.

9. The integrated energy storage control system (100) according to any one of claims 1-7, characterized in that, The integrated energy storage control system (100) further includes a slave control module (140), which is communicatively connected to the second control unit (112). The slave control module (140) is also electrically connected to the energy storage battery (160) and is used to collect the energy storage battery information and send the energy storage battery information to the second control unit (112). The second control unit (112) is used to generate the energy storage battery management signal based on the energy storage battery information.

10. The integrated energy storage control system (100) according to any one of claims 1-7, characterized in that, The integrated energy storage control system (100) further includes an environmental monitoring module (150), which is communicatively connected to the second control unit (112). The environmental monitoring module (150) is used to collect the grid information of the energy storage system and send the grid information to the second control unit (112). The second control unit (112) is used to generate the energy storage management signal based on the grid information.

11. A method for controlling an integrated energy storage unit, applied to the integrated energy storage unit control system (100) according to any one of claims 1-10, characterized in that, The energy storage integrated machine control method includes: A current control signal is generated based on at least one of the current and voltage of the energy storage system; Energy storage battery management signals are generated based on the energy storage battery information of the energy storage system, and energy storage management signals are generated based on the power grid information of the energy storage system. The corresponding actions are performed based on the current control signal, the energy storage battery management signal, and the energy storage management signal.

Images