CN211790930U - High-reliability high-voltage-stabilizing-precision alternating current and direct current uninterruptible power supply system - Google Patents
High-reliability high-voltage-stabilizing-precision alternating current and direct current uninterruptible power supply system Download PDFInfo
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- CN211790930U CN211790930U CN202020358734.8U CN202020358734U CN211790930U CN 211790930 U CN211790930 U CN 211790930U CN 202020358734 U CN202020358734 U CN 202020358734U CN 211790930 U CN211790930 U CN 211790930U
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Abstract
The utility model provides a high reliability high voltage stabilization accuracy's alternating current-direct current uninterrupted power system, including industrial level AC/DC rectifier module, industrial level DC/DC voltage stabilizing module, industrial level DC/AC contravariant module, storage battery, battery management system and monitoring module, industrial level AC/DC rectifier module simultaneously with storage battery, industrial level DC/DC voltage stabilizing module and industrial level DC/AC contravariant module meet, the similar type module can connect in parallel the hot backup connection, all install high frequency isolation transformer inside, input and output fuse circuit, battery management system establishes the temperature, voltage, electric current and internal resistance measuring device, monitoring module establishes man-machine interaction interface and carries out remote monitoring and management to each industrial level module and storage battery through communication network, can export high accuracy alternating current-direct current constant voltage power supply under the environment that commercial power fluctuation range is big and climatic conditions are abominable, the system has the advantages of less power conversion times, small volume, high reliability and convenient expansion, and is particularly suitable for unattended operation and remote management of power supply systems of oil and gas fields and long-distance pipeline projects.
Description
Technical Field
The utility model relates to an uninterrupted power source technical field especially relates to an alternating current-direct current uninterrupted power source system of high steady voltage precision of high reliability.
Background
In the fields of oil and gas fields, long-distance pipelines, petrochemical industry and the like, the normal operation of production equipment, automation instruments and communication systems is greatly influenced by commercial power outage, and even safety accidents occur. Therefore, the continuous operation device needs an ac/dc uninterruptible power supply system, and especially under the condition of large fluctuation range of the power grid voltage, the reliability of the ac/dc uninterruptible power supply system and the voltage stabilization precision of the power supply voltage have high requirements. For some large-scale industrial systems, because of the long distance between the complete equipment or long-distance pipelines, a complete industrial system needs a plurality of power supply workstations, and each power supply workstation provides uninterrupted power supply for a plurality of equipment, thereby forming a scattered and long-distance power supply layout format.
Fig. 1 is a block diagram of an AC uninterruptible power supply system (DC UPS) commonly used in the industry at present, and is composed of a two-stage structure of an industrial AC uninterruptible power supply UPS1 (AC UPS) and an industrial AC/DC rectifier module REC1 (AC/DC), where first, the industrial AC uninterruptible power supply UPS1 provides an uninterrupted AC output, and then the industrial AC/DC rectifier module REC1 rectifies the AC to become a DC power supply required by a load L1, so as to implement uninterrupted power supply of a DC power supply. In this scheme, the commercial ac UPS1 is widely used in the industrial field because of its high reliability. It also has the following significant disadvantages:
1. although the technical scheme is of a two-stage structure, three-stage power conversion is actually carried out, wherein the first stage is a rectifying unit AC/DC inside the UPS1, the second stage is an inverting unit DC/AC inside the UPS1, and the third stage is an AC/DC of an industrial-grade AC/DC rectifying module REC 1. Each of the three stages of power conversion results in efficiency loss, and thus the conversion efficiency of the whole power system is low.
2. Industrial ac UPS1 generally uses a power frequency phase control technique, and has the problems of large size and high cost. And because the inside of the power supply system is not electrically isolated from the input and the output, an industrial frequency transformer T1 is required to be added, so that the whole power supply system is larger in size and higher in price.
3. The industrial-grade alternating current uninterruptible power supply UPS1 outputs alternating voltage, and the direct parallel power supply output has great technical difficulty, so that the capacity expansion of an uninterruptible power supply system is restricted, or the power supply reliability of the parallel power supply system is reduced.
4. The storage battery pack B1 is a core component of an energy source of an uninterruptible power supply system, and the industrial-grade alternating current uninterruptible power supply UPS1 detects only the voltage of the storage battery pack B1 and lacks judgment on the health state of the storage battery pack B1. If a certain storage battery in the storage battery pack B1 is degraded in series connection, the power supply to the load L1 is interrupted, and the accelerated degradation of the degraded storage battery is caused because the industrial alternating current uninterruptible power supply UPS1 lacks the detection and early warning functions, so that the reliability of the power supply of the whole uninterruptible power supply system is influenced.
5. The commercial ac UPS1 is limited by the current stress of the power semiconductor devices, and the requirement for higher power or longer standby time is generally satisfied by increasing the number of battery B1, but is difficult to satisfy by increasing the capacity (AH number) of a single battery, and as the number of battery series nodes increases, the cost increases, the size increases, and the reliability decreases.
6. When the places needing uninterrupted power supply are many and the distance between each other is far, the uninterrupted power supply system with independent use of each place is inconvenient for remote management and unattended operation, the management cost is high and potential safety hazards exist.
7. In an industrial power utilization field, not only needs a high-precision uninterrupted direct current power supply, but also needs a stable uninterrupted alternating current power supply, and the high-precision uninterrupted direct current power supply and the stable uninterrupted alternating current power supply need to be combined to meet the needs and save resources.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an alternating current-direct current uninterrupted power system with high steady voltage precision of high reliability makes its power conversion efficiency high, output is big, protect function is strong, the power supply precision is high, the system reliability is good, the dilatation is convenient and be convenient for carry out remote monitoring and management to multichannel alternating current-direct current uninterrupted power system through communication network.
The utility model adopts the technical proposal that: the alternating current-direct current uninterruptible power supply system comprises an industrial-grade AC/DC rectification module REC2, an industrial-grade DC/DC voltage stabilizing module CON1, an industrial-grade DC/AC inversion module NB and a storage battery pack B2, wherein the alternating current input end of the industrial-grade AC/DC rectification module REC2 is connected with a single-phase or three-phase alternating current power supply and rectifies the alternating current power supply into a direct current power supply. The direct current output end of the industrial-grade AC/DC rectification module REC2 is connected with a storage battery pack B2 and is connected with the direct current input ends of an industrial-grade DC/DC voltage stabilizing module CON1 and an industrial-grade DC/AC inversion module NB; the output end of the industrial DC/DC voltage stabilizing module CON1 is connected with a load L2 through a DC main switch K1, and the output end of the industrial DC/AC inverter module NB is connected with an AC load L3 through an AC main switch K2; the battery management system BMS is internally provided with a temperature sensor, a voltage measuring device, a current measuring device and an internal resistance measuring device which are respectively connected with each battery of the storage battery pack B2, and a communication port of the monitoring module MON1 is respectively connected with a communication port of the industrial AC/DC rectifying module REC2, the industrial DC/DC voltage stabilizing module CON1, the industrial DC/AC inverter module NB and the storage battery management system BMS through a communication network.
The industrial-grade AC/DC rectifying module REC2 is one or formed by connecting a plurality of industrial-grade AC/DC rectifying modules in parallel; the industrial DC/DC voltage stabilizing module CON1 is one or formed by connecting a plurality of industrial DC/DC voltage stabilizing modules in parallel; the industrial-grade DC/AC inversion module NB is one or formed by connecting a plurality of industrial-grade DC/AC inversion modules in parallel.
A high-frequency isolation transformer, an alternating current input fusing circuit, a direct current output fusing circuit and an anti-blocking circuit are arranged in the industrial-grade AC/DC rectifying module REC 2; a high-frequency isolation transformer, a direct-current input fusing circuit, a direct-current output fusing circuit and an anti-blocking circuit are arranged in the industrial-grade DC/DC voltage stabilizing module CON 1; and a high-frequency isolation transformer, a direct current input fusing circuit, an alternating current output fusing circuit and an anti-blocking circuit are arranged in the industrial-grade DC/AC inverter module NB.
The storage battery pack B2 is a single storage battery, or is formed by connecting a plurality of storage batteries in series or in parallel; the storage battery type of the storage battery pack B2 is a valve-regulated lead-acid battery, an open lead-acid battery, a nickel-chromium battery, a lithium iron phosphate battery and a ternary lithium battery.
The monitoring module MON1 is provided with a human-computer interface and includes the display, inquiry and setting of parameters and operating information.
The communication port is an RS-485 interface.
The alternating current input end is a single-phase three-wire system, the allowable voltage variation range is +/-20%, and the allowable frequency variation range is 50Hz +/-2 Hz.
The output voltage of the industrial grade DC/DC voltage stabilizing module CON1 is DC24V and DC48V, and the error precision is +/-0.3V; the alternating current output voltage of the industrial-grade DC/AC inverter module NB is AC 220V.
The load L2 is in multiple paths and is controlled by a direct current packet switch; the ac load L3 is multi-path and is controlled by ac packet switches.
Compared with the prior art, the beneficial effects of the utility model are that: 1. the electric energy conversion efficiency is high: for direct current voltage stabilization, because only AC/DC conversion and DC/DC voltage stabilization two-stage power conversion are adopted, the intermediate inversion link is saved, the electric energy consumption is reduced, and the conversion efficiency of the power supply is improved.
2. The voltage stabilization precision is high: because the large-size external power frequency isolation transformer is cancelled, and the small-size high-frequency isolation transformer with the high-frequency switching technology is adopted, the total volume is greatly reduced, the external isolation and anti-interference performance is better, the voltage-stabilizing output precision is higher, and the cost is also reduced.
3. The dilatation is convenient: the industrial-grade AC/DC rectifying module, the industrial-grade DC/DC voltage stabilizing module and the industrial-grade DC/AC inversion module can be directly connected in parallel, the number of the industrial-grade AC/DC rectifying module, the industrial-grade DC/DC voltage stabilizing module and the industrial-grade DC/AC inversion module can be dozens of modules in parallel, the load capacity is improved, later expansion is facilitated, hot backup can be carried out on the system by utilizing the parallel connection characteristics of the industrial-grade AC/DC rectifying module, the.
5. The battery maintenance is convenient: because each battery of the storage battery pack is provided with the detection and management system, the storage battery can be subjected to health diagnosis at any time, faults can be found in time, the service life is prolonged, and the stable operation of the system is ensured.
6. Increase output power and prolong the standby power time: because the storage battery has a quick maintenance function, a single large-capacity storage battery can be adopted or a plurality of storage batteries can be used after being expanded, the size is relatively reduced, the output power is increased, the power preparation time is prolonged, and the investment cost is reduced.
7. The networked management can be realized: because each component unit is provided with a communication port, real-time detection, control and alarm can be carried out through a network and an RS-485 bus, the working efficiency and safety of the system are improved, unattended operation and remote automatic management of a power supply system are realized, and human resources are saved.
Drawings
Fig. 1 is a schematic diagram of a prior art solution.
Fig. 2 is a block diagram illustrating the basic principle of the present invention.
Fig. 3 is a block diagram of the battery management system of the present invention.
Fig. 4 is a block diagram of the communication management system of the present invention.
Fig. 5 is a schematic diagram of the communication management system of the present invention.
Fig. 6 is a block diagram of the hot standby system of the present invention.
Fig. 7 is a schematic diagram of the communication port RS-485 bus circuit of the present invention.
The notation in the figure is:
industrial grade AC/DC rectification module: REC 2; industrial grade DC/DC voltage stabilization module: CON 1;
industrial grade DC/AC inverter module: NB; a storage battery pack: b2;
storage battery management system: a BMS; a monitoring module: MON 1;
a direct current main switch: k1; loading: l2;
an AC main switch: k2; and (3) alternating current load: l3;
RS-485 transceiver: IC 1; photoelectric coupling isolation circuit: IC;
a protection circuit: C.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
The utility model discloses technical scheme's embodiment is applied to the uninterrupted power supply system of alternating current-direct current in oil gas field, and this oil gas field contains a plurality of main work areas that have the certain distance, and 1 set or many sets of power supply workstation are disposed to every work area, and every power supply workstation provides alternating current-direct current working power supply for several or tens of consumer to there is the demand of power supply workstation and consumer dilatation. A plurality of working areas of the oil and gas field are in remote areas, the climate conditions are severe, the mains voltage is unstable, and the possibility of power failure often exists. Therefore, there is a need for uninterruptible power supply configuration and networked management of decentralized and unstable power supply systems. The configuration of the uninterrupted power system of each power supply workstation comprises an industrial-grade AC/DC rectification module, an industrial-grade DC/DC voltage stabilizing module, an industrial-grade DC/AC inversion module, a storage battery pack, a storage battery management system and a monitoring module, wherein a host of the computer management system is arranged in a management center.
As shown in fig. 2, an industrial AC/DC rectifier module REC2 rectifies an AC single-phase power supply or an AC three-phase power supply into a DC power supply, a DC output port of the DC rectifier module REC2 is connected to DC input terminals of a battery pack B2 and an industrial DC/DC regulator module CON1, a DC output terminal of the industrial DC/DC regulator module CON1 is connected to a load L2, and when a commercial AC power system loses power or fails, the battery pack B2 supplies power to the load L2 through the industrial DC/DC regulator module CON 1. In the scheme, the commercial power is a single-phase three-wire system, the alternating-current voltage is AC220, the voltage allowable variation range is +/-20%, the frequency allowable variation range is 50Hz +/-0.2V, the load L2 is a direct-current load, the direct-current output voltage of the storage battery pack B2 and the industrial-grade DC/DC voltage stabilizing module CON1 can be configured into 24V or 48V according to requirements, and under the configuration, the accuracy of direct-current voltage stabilizing output can reach +/-0.3V. Because the allowable variation range of the alternating-current input voltage is large, and the error range of the direct-current output voltage is small, the uninterrupted high-precision direct-current power supply is provided for the direct-current load.
The battery pack B2 is a single battery, and has a capacity increased compared with the past, or is composed of a plurality of batteries connected in series or in parallel, so that a larger capacity storage is realized. The storage battery type of the storage battery pack B2 can be respectively selected from valve-regulated lead-acid batteries, open lead-acid batteries, nickel-chromium batteries, lithium iron phosphate batteries and ternary lithium batteries according to specific application and cost performance.
As shown in fig. 3, a battery management system BMS is added to the solution of fig. 2, and a temperature sensor, a voltage measuring device, a current measuring device and an internal resistance measuring device are arranged inside the battery management system BMS and are respectively connected to each cell of a single battery or a battery pack B2. The monitoring system is used for monitoring the health state of each battery, including but not limited to health parameters such as temperature, voltage, current and internal resistance, and timely uploading and alarming after problems are detected.
As shown in fig. 4 and 5, based on the solutions shown in fig. 2 and 3, the output terminal of the industrial-grade AC/DC rectification module REC2 is connected to the DC input terminal of the industrial-grade DC/AC inversion module NB, so as to add an AC uninterruptible power supply function to the DC uninterruptible power supply system. In practical application, in order to separate the power supply of the direct current load from the power supply of the alternating current load, the output end of the industrial-grade DC/DC voltage stabilization module CON1 is connected with the load L2 through a direct current main switch K1, the load L2 at this time is a direct current load, the output end of the industrial-grade DC/AC inverter module NB is connected with an alternating current load L3 through an alternating current main switch K2, and the direct current load or the alternating current load can be determined to be connected by controlling the two main switches. In each power supply workstation, a communication port of the monitoring module MON1 is respectively connected with a communication port of an industrial AC/DC rectification module REC2, an industrial DC/DC voltage stabilizing module CON1, an industrial DC/AC inversion module NB and a communication port of a storage battery management system BMS through an RS-485 bus and a communication network. The monitoring module MON1 is provided with a human-computer interaction interface and includes display, query and setting of parameters and operation information, and the monitoring module MON1 of the control center is a computer in the embodiment and is used for receiving, storing, managing and controlling related parameters or operation information of the alternating current/direct current uninterruptible power supply system so as to realize high-precision functions of remote measurement, remote signaling, remote control and remote regulation through a network. The present embodiment adopts MODBUS communication protocol, but not limited thereto. The specific working process is as follows: the industrial-grade AC/DC rectifying module, the industrial-grade DC/DC voltage stabilizing module, the industrial-grade DC/AC inverting module and the storage battery management system upload dynamic operation parameters in a grading manner according to the requirements of the monitoring module, receive issued control instructions and carry out voltage limiting and constant-current intelligent floating charging on the storage battery pack B2. According to the requirement, the man-machine interaction interface adopts a large-screen color touch screen and is used for displaying and inquiring information such as the running state, fault alarm and the like of the AC/DC uninterrupted power supply system, and a user can set control parameters.
As shown in fig. 6, the industrial-grade AC/DC rectifying module REC2, the industrial-grade DC/DC voltage stabilizing module CON1, and the industrial-grade DC/AC inverting module NB are respectively composed of a plurality of same modules connected in parallel, and in this embodiment, 5 modules are connected in parallel. All modules with the same function are connected in parallel and then connected with the input bus and the output bus to form hot backup of a plurality of modules with the same function, so that the total power of the AC/DC uninterrupted power supply system is improved, and meanwhile, the reliability and the voltage stabilization output precision of the system are improved.
The industrial AC/DC rectification module REC2 is internally provided with a high-frequency isolation transformer, an alternating current input fusing circuit, a direct current output fusing circuit and an anti-blocking circuit; a high-frequency isolation transformer, a direct-current input fusing circuit, a direct-current output fusing circuit and an anti-blocking circuit can be arranged in the industrial-grade DC/DC voltage stabilizing module CON 1; a high-frequency isolation transformer, a direct current input fusing circuit, an alternating current output fusing circuit and an anti-blocking circuit can be arranged in the industrial-grade DC/AC inverter module NB; the protection circuit is respectively used for electrical isolation inside the module, overload protection outside an input end or an output end and parallel protection among modules of the same type, and normal work of upper and lower modules and modules among the modules can not be influenced due to the failure of one module. The anti-blocking circuit has the function of preventing the fault or short circuit outside the port from being reversely conducted into the port, and the normal work of the parallel module is ensured.
As shown in fig. 7, as an embodiment of the communication port, the communication port adopts an RS-485 standard interface circuit, which is composed of an RS-485 transceiver IC1 (model number of ADM483EAR in this embodiment), a plurality of photocoupling isolation circuits IC and a protection circuit C, the transmitting and receiving terminals of the RS-485 transceiver IC1 are connected to the transmitting and receiving terminals of the communication port through the photocoupling isolation circuits IC, respectively, the output terminal of the RS-485 transceiver IC1 is connected to the 485 bus through the protection circuit C, and the two-wire bidirectional differential signal transmission has multipoint and bidirectional communication capabilities, strong anti-interference capability and long transmission distance, and can communicate with each other between the man-machine interface MON1, the industrial AC/DC rectification module REC2, the industrial DC/DC voltage stabilizing module CON1 and the battery management system BMS.
In conclusion, because the utility model discloses an embodiment has adopted industrial grade AC/DC rectifier module REC2, industrial grade DC/DC voltage regulator module CON1 and industrial grade DC/AC contravariant module NB, internally mounted at these modules has high frequency isolation transformer, alternating current input fusing circuit, direct current output fusing circuit and anti stifled circuit to with the parallelly connected use of same module, make these modules have anti-interference, fault protection, make things convenient for dilatation and hot backup function, the output accuracy of alternating current-direct current uninterrupted power source has been improved under the big condition of grid voltage variation scope. And because the storage battery management system is arranged for the storage battery pack, and the detection device for the parameters such as temperature, voltage, current, internal resistance and the like is arranged for each section of storage battery, the capacity expansion of the storage battery is facilitated, the service life of the storage battery is prolonged, and the high-reliability operation of the uninterrupted power supply system is ensured. And because each functional module and the storage battery pack are connected in a network mode through the communication port, the monitoring module carries out remote monitoring, control and management, the management efficiency is improved, the operation cost is saved, and the stable operation of the system is ensured.
Claims (10)
1. The utility model provides a high voltage regulation precision's of high reliability alternating current-direct current uninterrupted power source system, includes industrial grade AC/DC rectifier module (REC 2), industrial grade DC/DC voltage regulation module (CON 1), industrial grade DC/AC contravariant module (NB) and storage battery (B2), and the alternating current input of industrial grade AC/DC rectifier module (REC 2) is connected with single-phase or three-phase alternating current power supply and rectifies alternating current power supply into direct current power supply, its characterized in that: the direct current output end of the industrial grade AC/DC rectifying module (REC 2) is connected with a storage battery pack (B2) and is connected with the direct current input ends of the industrial grade DC/DC voltage stabilizing module (CON 1) and the industrial grade DC/AC inverting module (NB); the output end of the industrial DC/DC voltage stabilizing module (CON 1) is connected with a load (L2) through a direct current main switch (K1), and the output end of the industrial DC/AC inverter module (NB) is connected with an alternating current load (L3) through an alternating current main switch (K2); the storage Battery Management System (BMS) is internally provided with a temperature sensor, a voltage measuring device, a current measuring device and an internal resistance measuring device, and is respectively connected with each battery of the storage battery pack (B2), and a communication port of the monitoring module (MON 1) is respectively connected with communication ports of the industrial AC/DC rectifying module (REC 2), the industrial DC/DC voltage stabilizing module (CON 1), the industrial DC/AC inverter module (NB) and the storage Battery Management System (BMS) through a communication network.
2. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the industrial grade AC/DC rectifying module (REC 2) is one or formed by connecting a plurality of industrial grade AC/DC rectifying modules in parallel; the industrial grade DC/DC voltage stabilizing module (CON 1) is one or formed by connecting a plurality of industrial grade DC/DC voltage stabilizing modules in parallel; the industrial-grade DC/AC inversion module (NB) is formed by connecting one or a plurality of industrial-grade DC/AC inversion modules in parallel.
3. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: a high-frequency isolation transformer, an alternating current input fusing circuit, a direct current output fusing circuit and an anti-blocking circuit are arranged in the industrial AC/DC rectifying module (REC 2); the industrial DC/DC voltage stabilizing module (CON 1) is internally provided with a high-frequency isolation transformer, a direct-current input fusing circuit, a direct-current output fusing circuit and an anti-blocking circuit; the industrial DC/AC inverter module (NB) is internally provided with a high-frequency isolation transformer, a direct current input fusing circuit, an alternating current output fusing circuit and an anti-blocking circuit.
4. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the storage battery pack (B2) is a single storage battery, or is formed by connecting a plurality of storage batteries in series or in parallel.
5. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the storage battery type of the storage battery pack (B2) is a valve-regulated lead-acid battery, an open lead-acid battery, a nickel-chromium battery, a lithium iron phosphate battery and a ternary lithium battery.
6. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the monitoring module (MON 1) is provided with a human-computer interaction interface and comprises parameters and operation information display, query and setting.
7. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the communication port is an RS-485 interface.
8. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the alternating current input end is a single-phase three-wire system, the voltage is AC220V, the allowable voltage variation range is +/-20%, and the allowable frequency variation range is 50Hz +/-2 Hz.
9. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the output voltage of the industrial grade DC/DC voltage stabilizing module (CON 1) is DC24V and DC48V, and the error precision is +/-0.3V; the alternating current output voltage of the industrial grade DC/AC inversion module (NB) is AC 220V.
10. The ac-dc uninterruptible power supply system with high reliability and high voltage-stabilizing precision according to claim 1, characterized in that: the load (L2) is in multi-path and is controlled by a direct current packet switch; the AC load (L3) is multiplexed and controlled by an AC packet switch.
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| CN202020358734.8U CN211790930U (en) | 2020-03-20 | 2020-03-20 | High-reliability high-voltage-stabilizing-precision alternating current and direct current uninterruptible power supply system |
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| CN202020358734.8U CN211790930U (en) | 2020-03-20 | 2020-03-20 | High-reliability high-voltage-stabilizing-precision alternating current and direct current uninterruptible power supply system |
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Effective date of registration: 20210218 Address after: 100027 Chaoyangmen North Street, Chaoyang District, Chaoyang District, Beijing Patentee after: SINOPEC Group Patentee after: SINOPEC OILFIELD SERVICE Corp. Patentee after: SINOPEC PETROLEUM ENGINEERING DESIGN Corp. Address before: 100020 Building 2, Chaoyang Gate office area, Sinopec, 9 jishikou Road, Chaoyang District, Beijing Patentee before: SINOPEC OILFIELD SERVICE Corp. Patentee before: SINOPEC PETROLEUM ENGINEERING DESIGN Corp. |