Temperature monitoring system of energy storage converter equipment

Abstract

The invention relates to a temperature monitoring system of energy storage converter equipment. The temperature monitoring system comprises a converter temperature control circuit and an output circuit temperature protection circuit, the output circuit temperature protection circuit is used for receiving an output circuit voltage signal and outputting a fan driving signal, and the output circuit temperature protection circuit comprises an energy supply circuit and an output circuit temperature control circuit; the converter temperature control circuit is used for receiving a voltage signal of a relay in an energy storage system and outputting a starting signal or a stopping signal, and the converter temperature control circuit comprises a temperature detection circuit, a processor and an energy storage system temperature control circuit. The energy storage system has the beneficial effects that under the condition that the temperature of the energy storage system is kept in a safe state, the common-mode loop energy recovery circuit is used for recovering electric energy which cannot be utilized in a power grid system to supply power to the output circuit temperature protection circuit, and energy saving is achieved.

Description

Technical Field

[0001] The invention belongs to the field of temperature monitoring, and in particular relates to a temperature monitoring system for energy storage converter equipment. Background Art

[0002] The production equipment of the power industry operates under high temperature, high pressure, high current and high speed. The online real-time temperature detection technology is difficult. A large number of equipment in the power system cannot be monitored online, so they have to be used at reduced capacity, resulting in great economic and energy waste. Therefore, it is very important to conduct online temperature detection of electrical equipment to ensure the stable operation of the main equipment of the power system and improve the quality of power production.

[0003] However, the prior art generally uses a separate power supply or an additional power supply for the temperature protection circuit, which cannot effectively utilize the electric energy in the power grid. Summary of the invention

[0004] The purpose of the present invention is to design a temperature monitoring system for energy storage converter equipment.

[0005] The specific technical solution of the present invention is as follows: A temperature monitoring system for an energy storage converter device comprises: a converter temperature control circuit, an output circuit temperature protection circuit;

[0006] The output circuit temperature protection circuit is used to receive the output circuit voltage signal and output the fan driving signal, and the output circuit temperature protection circuit includes an energy supply circuit and an output circuit temperature control circuit;

[0007] The inverter temperature control circuit is used to receive the voltage signal of the relay in the energy storage system and output a start signal or a stop signal. The inverter temperature control circuit includes a temperature detection circuit, a processor and an energy storage system temperature control circuit.

[0008] As an improvement, the energy supply circuit includes a common mode loop energy recovery circuit and an energy storage circuit, and the common mode loop energy recovery circuit includes a transformer T, a capacitor C2, an AC / AC converter, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45 and a breakdown diode.

[0009] As a further improvement, the energy storage circuit includes a resistor R46, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7.

[0010] As a further improvement, the output circuit temperature control circuit includes a temperature detection circuit, an amplification circuit, and a drive circuit.

[0011] As a further improvement, the temperature detection circuit includes a resistor R47, a thermistor R48 and a capacitor C8.

[0012] As a further improvement, the amplifying circuit includes a resistor R49, a resistor R50, a resistor R51, and a bipolar transistor.

[0013] As a further improvement, the driving circuit includes a resistor R52, a capacitor C9, a diode D9, a MOS tube and a parasitic diode of the MOS tube.

[0014] As a further improvement, the temperature detection circuit is used to receive a voltage signal from a relay in the energy storage system and output a voltage comparison signal.

[0015] As a further improvement, the processor is used to receive the voltage comparison signal and output a fan driving signal.

[0016] As a further improvement, the energy storage system fan control circuit is used to receive the fan drive signal and output a start signal or a stop signal.

[0017] The beneficial effect of the present invention is that, while ensuring that the temperature of the energy storage system remains in a safe state, the common-mode loop energy recovery circuit recovers the unusable electric energy in the power grid system to power the output circuit temperature protection circuit, thereby achieving energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a temperature monitoring system for an energy storage converter device according to the present invention;

[0019] Figure 2 A circuit diagram of a common-mode loop energy recovery circuit and an energy storage circuit temperature control circuit of a temperature monitoring system for an energy storage converter device of the present invention;

[0020] Figure 3 The present invention is a circuit diagram of a temperature control circuit of a temperature monitoring system of an energy storage converter device. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0022] The specific technical solution of the present invention is as follows: Figure 1As shown, a temperature monitoring system for an energy storage inverter device includes an inverter temperature control circuit and an output circuit temperature protection circuit; the output circuit temperature protection circuit is used to receive an output circuit voltage signal and output a fan drive signal, and the output circuit temperature protection circuit includes an energy supply circuit and an output circuit temperature control circuit; the inverter temperature control circuit is used to receive a voltage signal from a relay in an energy storage system and output a start signal or a stop signal, and the inverter temperature control circuit includes a temperature detection circuit, a processor and an energy storage system temperature control circuit; the temperature detection circuit is used to receive a voltage signal from a relay in an energy storage system and output a voltage comparison signal, the processor is used to receive the voltage comparison signal and output a drive signal, and the energy storage system temperature control circuit is used to receive the drive signal and output a start signal or a stop signal. It should be noted that the output start signal or stop signal is used to control the built-in air conditioner in the energy storage system for temperature control.

[0023] like Figure 2 As shown, the energy supply circuit includes a common-mode loop energy recovery circuit and an energy storage circuit. The common-mode loop energy recovery circuit includes a transformer T (wherein, L1 and L2 are two windings of the transformer T, L1 is the primary coil, and L2 is the secondary coil. The transformer T converts 220Vac alternating current into 24V direct current), a capacitor C2, an AC / AC converter, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45 and a breakdown diode. The energy storage circuit includes a resistor R46 (24V power supply port), a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7. The above resistors are preferably 10 ohm PTC thermistors. The capacitors are all 100uF / 35V, and the function of the capacitors is to convert the alternating current 24V into direct current 24V. It should be noted that the transformer T in the common-mode loop energy recovery circuit is connected to the output circuit, and the electric energy that cannot be used in the power grid system is recovered through the common-mode loop energy recovery circuit to power the output circuit temperature protection circuit, thereby achieving energy saving.

[0024] like Figure 3 As shown, the output circuit temperature control circuit includes a temperature detection circuit, an amplifier circuit, and a drive circuit. The temperature detection circuit includes a resistor R47, a thermistor R48, and a capacitor C8. The amplifier circuit includes a resistor R49, a resistor R50, a resistor R51, and a bipolar transistor. The drive circuit includes a resistor R52, a capacitor C9, a diode D9, a MOS tube, and a parasitic diode of the MOS tube. Among them, the capacitor is used for filtering, and the diode is used to protect the fan.

[0025] It should be noted that it also includes a battery temperature protection module. There are 7 temperature collection points in the battery module, of which 4 are set on the side of the battery cell pole, mainly used to detect the temperature of the battery cell body; 3 temperature collection points are used to detect the contact effect between the copper busbar and the aviation plug of the battery plug box. The battery temperature protection module is fanless, and heat dissipation ducts are reserved between the internal modules to ensure the temperature consistency of the battery cell. With the battery cluster air duct drainage, the maximum operating temperature does not exceed 40℃, and the temperature difference is ≤5℃.

[0026] It should be noted that it also includes a thermal management system. The thermal management system (TMS) consists of air conditioning, integral air ducts (built-in flow control devices), cabinet air ducts, built-in cooling fans, temperature and humidity sensors, etc. The system uses active air cooling to control the temperature of the energy storage system. Thermal performance analysis is performed according to the operating conditions of the battery system, and the cooling and heating requirements of the entire system are analyzed. Industrial air conditioning and reasonable air duct design, as well as the optimized design of fans and air ducts inside each battery cluster, are used to achieve effective temperature, humidity, and condensation control of the internal cells and key components of the energy storage system, so that the working environment of the energy storage system is suitable, the service life of the entire system is extended, and the operation is safe and reliable.

[0027] Box system level

[0028] 1) After multiple rounds of CFD optimization, the curved air duct and parallel air duct design were adopted, and the relative positions of industrial air conditioners and battery clusters were reasonably configured to ensure the temperature uniformity between each battery cluster.

[0029] 2) The box as a whole has good thermal insulation performance, which effectively reduces the heat exchange with the outside world, ensuring the thermal performance of the system while significantly reducing the energy consumption of the system.

[0030] 3) The container is integrated with air conditioning to achieve heating and cooling functions;

[0031] 4) An integral air duct is set above the box and equipped with a fan to achieve uniform temperature distribution throughout the box.

[0032] Battery Cluster Level

[0033] 1) Air conditioning air enters from the top of the cabinet, flows to the back of the cabinet, passes through the plug-in box, and blows out from the front;

[0034] 2) The air duct guide plate adopts a multi-stage structural design, and the air volume of each air outlet is more evenly distributed;

[0035] 3) Install a fan on the top of the cabinet to increase the flow rate and velocity of cold air and increase the convection heat transfer coefficient;

[0036] 4) A parallel air path design is adopted, and a cold air compensation port is opened at the top of the battery cluster to ensure temperature balance between each plug-in box.

[0037] 5) Strict CFD simulation calculations are performed at the battery cluster level, and multiple optimizations are performed to ensure uniform wind speed and cell temperature in each part of the battery cluster.

[0038] Battery module level

[0039] 1) The module is supported and fixed by the bottom beam structure, which reduces weight while effectively increasing the contact area between the module surface and the cooling air, thereby improving thermal management performance;

[0040] 2) A guide structure is added at the air outlet to effectively control the cooling air volume and direction to ensure uniform air volume for each battery cell inside the module.

[0041] Thermal Management Calculations Instructions

[0042] According to the heating power / rate of the battery system during the project operation, the most stringent operating conditions are extracted to evaluate the short-time temperature rise and extreme design.

[0043] The battery heat generation is determined according to the equivalent charge and discharge rate, and the heat load demand is determined by considering the heat generation of components such as fans and auxiliary power supplies, as well as the heat exchange requirements with the external environment. Four 20kW integrated variable-frequency air conditioners are selected.

[0044] It should be noted that it also includes the converter ventilation and heat dissipation solution, adopts intelligent fan speed regulation technology, fan redundancy design and fan fault diagnosis technology to further improve the reliability of the product. The technical measures taken for PCS ventilation and heat dissipation are as follows;

[0045] (a) The heat dissipation design with high wind pressure, high wind speed and low wind volume reduces the heat generation of power devices while reducing the ventilation requirements of the converter room, effectively alleviating the contradiction between the air volume and dust prevention design in the current converter room ventilation design process.

[0046] (b) Unique and complete in-machine environment detection network. This detection network covers the temperature data of each IGBT and each magnetic component, as well as the analog data of the ambient temperature and humidity of the converter power compartment and control compartment; and the above data is used to realize the intelligent speed control of the fan inside the PCS and the intelligent start and stop control of the fan in the converter room.

[0047] (c) The converter can provide an intelligent control interface for the converter room fan, which can directly connect a three-phase or single-phase fan from the port provided by the converter, simplifying the external fan power distribution design of the converter room.

[0048] (d) An optional dual power supply option for installing an external fan in the converter can be used to achieve automatic switching between station power supply and self-generation of the converter room fan.

[0049] (e) The whole machine adopts a special air duct forced air cooling measure to effectively avoid the accumulation of hot air in the cabin.

[0050] Unlike the "start-stop" control method adopted by most manufacturers in the industry, the internal heat dissipation fan of the converter involved in the present invention adopts a multi-gear intelligent fan speed control system. Since the output voltage of the converter remains unchanged, when the output load increases, the output current of the energy storage converter increases, the internal resistance of the energy storage converter remains unchanged, the output current increases, the power consumption increases, and the power consumption is dissipated in the form of heat. At this time, the temperature of the key components IGBT inside the energy storage converter will rise rapidly. At this time, in order to increase the speed of the heat dissipation fan, it is necessary to increase it. According to the temperature of the key components in the machine, the output load size and other comprehensive factors, the heat dissipation fan in the machine will work in three states of "no rotation", "low speed" and "high speed", realizing the optimal matching with the operating state of the converter. Through this control method, the mechanical impact caused by frequent start and stop of the fan is avoided, the service life of the fan is greatly extended, and the power consumption of the fan is also reduced. By adding options, the converter can also realize intelligent control of the external environment heat dissipation fan, and the environmental fan is also included in the converter control system.

[0051] Including the external environment cooling fan, the converter involved in the present invention can monitor the operating status of each cooling fan in real time, and can immediately issue an alarm in case of failure to remind the user to replace it. Due to the "redundancy" consideration in the design of ventilation and heat dissipation, under rated conditions, the failure of a fan will not affect the normal power generation of the whole machine. If replaced in time, it will reduce the power generation loss caused by the system overheating shutdown due to the failure of the cooling fan, and correspondingly improve the system reliability. In order to maximize the system's power generation, the PCS can still "reduce power" when the external environment temperature exceeds 55 degrees, or when the PCS fan fails. At this time, the PCS will automatically reduce the output power generation, and the temperature of the internal key components will be limited to the maximum allowable point.

[0052] It should be noted that there is also another inverter ventilation and heat dissipation solution, an integrated box internal equipment heat dissipation and outlet protection solution: there are shutters and dust screens at the door of the inverter room, which are the air inlets; there are earmuffs on the rear sides of the box, which are the air outlets, and the inverter hot air outlet duct and the power station environment heat dissipation duct are designed to be separated. The converters are all designed with thermal simulation optimization, which has been verified by actual measurements to effectively avoid heat accumulation inside the equipment and short circuit in the air duct. The converter hot air outlet duct is built with high-quality large-diameter axial flow centrifugal fans (EBM), which have better air outlet effect and lower noise. The fan is started and stopped by the internal temperature control of the converter, and the converter controls the fan speed to reduce energy consumption. The fan power supply adopts dual power supply to ensure the operation of the fan. The converter can continuously monitor the operating status of the cooling fan and control the fan operation in real time. The converter outlet is equipped with an arc duct with enhanced anti-corrosion treatment to resist strong headwinds and ensure that the protective duct has a long working life. Dustproof nets and protective nets or wind control shutters can be installed in the converter outlet arc duct to prevent foreign objects or small insects from invading and ensure the safe operation of the converter. Each converter in the power station is equipped with a separate cooling system, and the patented multi-stage AC fan speed regulation technology achieves the optimal match between heat generation and air output, further reduces control system losses, and significantly improves the operating life of the fan.

[0053] It should be noted that the maximum heat consumption of PCS is 12kW and the maximum exhaust volume is 6000m^3 / h.

[0054] The above-described embodiments are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A temperature monitoring system for an energy storage converter device, characterized in that: include: Converter temperature control module, output circuit temperature protection module; The output circuit temperature protection module is used to receive the output circuit voltage signal and output the fan driving signal. The output circuit temperature protection module includes an energy supply circuit and an output circuit temperature control circuit. The inverter temperature control module is used to receive the voltage signal of the relay in the energy storage system and output a start signal or a stop signal. The inverter temperature control module includes a temperature detection circuit, a processor and an energy storage system temperature control circuit.

2. A temperature monitoring system for an energy storage converter device according to claim 1, characterized in that: The energy supply circuit includes a common mode loop energy recovery circuit and an energy storage circuit. The common mode loop energy recovery circuit includes a transformer T, a capacitor C2, an AC / AC converter, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45 and a breakdown diode D7.

3. A temperature monitoring system for an energy storage converter device according to claim 2, characterized in that: The energy storage circuit includes a resistor R46, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7.

4. The temperature monitoring system of an energy storage converter device according to claim 1, characterized in that: The output circuit temperature protection circuit is used to receive the electric energy of the power supply circuit and the temperature information of the output circuit, and the output is an output circuit fan driving signal. The output circuit temperature control circuit includes a temperature detection circuit, an amplification circuit, and a driving circuit.

5. A temperature monitoring system for an energy storage converter device according to claim 4, characterized in that: The temperature detection circuit includes a resistor R47, a thermistor R48 and a capacitor C8.

6. A temperature monitoring system for an energy storage converter device according to claim 4, characterized in that: The amplifier circuit includes a resistor R49, a resistor R50, a resistor R51, and a bipolar transistor.

7. A temperature monitoring system for an energy storage converter device according to claim 4, characterized in that: The driving circuit includes a resistor R52, a capacitor C9, a diode D9, a MOS tube and a parasitic diode of the MOS tube.

8. The temperature monitoring system for an energy storage converter device according to claim 1, characterized in that: The temperature detection circuit is used to receive the voltage signal of the relay in the energy storage converter device, and the output is a voltage comparison signal.

9. The temperature monitoring system for an energy storage converter device according to claim 1, characterized in that: The processor is used to receive the voltage comparison signal and output a fan driving signal.

10. A temperature monitoring system for energy storage converter equipment according to claim 1, characterized in that: The energy storage system temperature control circuit is used to receive the drive signal and output a start signal or a stop signal.

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