CN210780228U - Silicon controlled energy storage control device for multiple parallel variable frequency power supplies - Google Patents
Silicon controlled energy storage control device for multiple parallel variable frequency power supplies Download PDFInfo
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- CN210780228U CN210780228U CN201921859141.3U CN201921859141U CN210780228U CN 210780228 U CN210780228 U CN 210780228U CN 201921859141 U CN201921859141 U CN 201921859141U CN 210780228 U CN210780228 U CN 210780228U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The utility model discloses a silicon controlled energy storage control device for a plurality of parallel variable frequency power supplies; the system comprises a main variable frequency power supply and at least one slave variable frequency power supply, wherein the input ends of the main variable frequency power supply and the slave variable frequency power supply are respectively connected with three-phase alternating current voltage; the master and slave variable frequency power supplies respectively comprise a control loop, a monitoring loop, a feedback loop, an energy storage control loop, a parallel signal processing loop and an energy storage loop; the parallel signal processing circuit is mainly used for controlling the energy storage circuit by the master variable frequency power supply and each slave variable frequency power supply; the energy storage loop comprises a controlled silicon and an energy storage capacitor, and the controlled silicon is connected with the energy storage capacitor through a copper bar; the monitoring loop, the energy storage control loop and the feedback loop are all connected with the energy storage loop through electric signals, and real-time monitoring and control over the energy storage loop are achieved. The utility model discloses a mode of monitoring, control and feedback for arbitrary variable frequency power supply begins the energy storage for electric capacity at zero-voltage, and guarantees that every variable frequency power supply has all accomplished the energy storage before operating.
Description
Technical Field
The utility model relates to a silicon controlled rectifier energy storage control device among the high-voltage resonance test system in the electric power system field, concretely relates to many silicon controlled rectifier energy storage control device for parallelly connected variable frequency power supply.
Background
With the rapid development of the power industry, the voltage grade and the capacity of the power system transmission are higher and higher, and especially the requirements on the voltage grade and the capacity of a long-distance submarine cable are also higher, so that a series-resonance test system with a large capacity is required to perform an alternating-current voltage withstand test on the submarine cable.
At present, the capacity of a single variable frequency power supply in domestic market can not meet the withstand voltage test of high-capacity power transmission and distribution equipment, the output capacity of the power supply can be increased by connecting the variable frequency power supplies in parallel, the direct current energy storage control loop of the silicon controlled rectifier needs to realize the synchronization start and completion besides the circulation of the output end and the like, and the synchronization of the system work and the control is convenient.
The document retrieval of the prior art finds that Chinese patent document No. CN201710705724.X, publication No. 2018-02-13, discloses a synchronous trigger circuit of parallel thyristors for a frequency converter, which is used for triggering a plurality of parallel thyristors. The pulse signal generating device comprises a pulse signal generating module, a pulse counter module, a synchronous signal generating module, a pulse synthesizing module and a pulse amplifying module. The pulse signal generating module generates a pulse signal for driving the silicon controlled rectifier; the pulse counter module inputs the pulse signal, and the pulse signal is phase-shifted into a plurality of paths of driving pulse signals with different phases; the synchronous signal generating module generates a synchronous signal synchronous with an alternating current power grid; the pulse synthesis module inputs a plurality of paths of pulse signals for driving and outputs a plurality of paths of synchronous pulse signals synchronous with an alternating current power grid according to the synchronous signals; and the pulse amplification module amplifies the power of the multi-path synchronous pulse signal and outputs the amplified power to the gate pole of each corresponding controllable silicon to trigger the conduction of each controllable silicon. However, the above-mentioned technology does not relate to a trigger circuit of a three-phase thyristor, and when the thyristor is in a three-phase state, the synchronous and phase-shift trigger signal is also considered, so a new three-phase thyristor energy storage control loop is needed to solve the timing sequence problem of the three-phase energy storage in the same three-phase variable frequency power supply.
Chinese patent No. CN108880522A, publication No. 2018-11-23, discloses a thyristor trigger circuit, which relates to the field of electric control technology and comprises a time-sharing control circuit, a trigger and a thyristor power output loop. The time-sharing control circuit is used for respectively detecting voltages with different phase angles relative to the two alternating current input ends in the positive half cycle and the negative half cycle of the alternating current, and respectively providing different currents for the controlled silicon power output circuit through the trigger so that the controlled silicon power output circuit outputs different currents for the load, and the problem of triggering the controlled silicon in reverse parallel connection is solved. The circuit can independently control the power output of the positive and negative half cycles and also can accurately adjust the symmetry of the power output of the positive and negative half cycles. The power output stability is good, the circuit is simple, the cost is low, and the method is also suitable for a low-power circuit control system. However, the above technology does not relate to how to control the thyristors in different cabinets in a time-sharing manner when the thyristors are connected in parallel, and a thyristor trigger circuit in one cabinet is required to control the phase angles of the thyristors in the cabinet to be relatively centralized due to only two input end signals, but parallel output is realized between different cabinets, and in order to avoid the generation of circulating current, the voltage error of the thyristors in the cabinet is required to be controlled within 0.5% at the same time after rectification, so that the control mode when the thyristors in different cabinets are simultaneously triggered is considered, and when a plurality of variable frequency power supplies are connected in parallel, if an energy storage loop of one of the variable frequency power supplies does not store energy, the test cannot be carried out.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a mode that adopts monitoring, control and feedback for arbitrary variable frequency power supply begins the energy storage for electric capacity at zero-voltage, and guarantees that every variable frequency power supply all accomplished many parallelly connected for variable frequency power supply silicon controlled energy storage control device of energy storage before operating.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a plurality of silicon controlled energy storage control devices for parallel connection of variable frequency power supplies; the silicon controlled energy storage control device comprises:
the main frequency-conversion power supply is provided with a frequency-conversion power supply,
the interface on the slave variable frequency power supply is connected in parallel with the interface on the main variable frequency power supply through a light drill rod;
the input ends of the master variable frequency power supply and the slave variable frequency power supply are respectively connected with three-phase alternating voltage, and each input end of each variable frequency power supply must be in phase;
the main and the slave variable frequency power supplies all comprise:
the control loop is connected with the parallel signal processing loop through an electric signal to realize the control and state monitoring of the energy storage loop;
the monitoring circuit is mainly used for detecting whether the direct-current voltage on two sides of the energy storage capacitor on the energy storage circuit is within a normal allowable range;
the feedback loop is mainly used for transmitting and receiving alarm signals from a silicon controlled rectifier and an energy storage capacitor on the energy storage loop, so that the energy storage loop is monitored and protected in real time;
the energy storage control circuit is mainly used for triggering, opening and closing the controlled silicon on the energy storage circuit;
the parallel signal processing circuit is mainly used for controlling the energy storage circuit from the variable frequency power supply by the main variable frequency power supply, and the parallel signal processing circuit is connected with the monitoring circuit through optical fiber signals and receives data acquired by the monitoring circuit; the parallel signal processing loop is connected with the feedback loop through an optical fiber signal and receives an abnormal signal of the energy storage loop; the parallel signal processing circuit is connected with the energy storage control circuit through optical fiber signals to realize the control of the energy storage signals;
the energy storage circuit comprises a controlled silicon and an energy storage capacitor, and the controlled silicon is connected with the energy storage capacitor through a copper bar;
the monitoring loop, the energy storage control loop and the feedback loop are all connected with the energy storage loop through electric signals, and real-time monitoring and control over the energy storage loop are achieved.
In one embodiment of the present invention, the interface of the main variable frequency power supply is connected to the parallel signal processing circuit of the main variable frequency power supply, and the interface of the slave variable frequency power supply is connected to the parallel signal processing circuit of the slave variable frequency power supply.
In an embodiment of the present invention, the main variable frequency power supply sends the control signal of the energy storage loop to the slave variable frequency power supply through the parallel signal processing loop, and the slave variable frequency power supply sends the abnormal signal of the energy storage loop from the variable frequency power supply to the main variable frequency power supply through the parallel signal processing loop.
In an embodiment of the present invention, the parallel signal processing circuit is divided into a single-machine mode and a parallel mode, and the control circuit of the main variable frequency power supply after the normal startup of each variable frequency power supply is realized by setting, and when the control circuit is set to the single-machine mode, each signal for parallel connection is set to be in a normal state and is not collected; only when the parallel mode is set, the control loop of the main frequency conversion power supply can collect and process each signal of the signal parallel loop, and the collection confusion and false alarm of the signals under each state are avoided.
In an embodiment of the present invention, the parallel signal processing loop is composed of an optical fiber transmission line and a signal processing module; wherein: the optical fiber transmission line is used for transmitting a control signal and an abnormal signal which are sent by the main variable frequency power supply and are used for an energy storage loop to the main variable frequency power supply, the slave variable frequency power supply is responsible for receiving the signal sent by the optical fiber transmission line, and when the slave variable frequency power supply is abnormal, the abnormal signal is sent to the main variable frequency power supply through the optical fiber transmission line; the signal processing module processes the detected abnormal data and the control signal and sends two paths of same signals, one path of same signals is sent to the main variable frequency power supply, the other path of same signals is transmitted to the slave variable frequency power supply through the optical fiber transmission line, all states and control of the energy storage loop are synchronized, and when the main variable frequency power supply receives the abnormal signals sent by the parallel signal processing loop, the main variable frequency power supply interrupts operation and sends a brake separating instruction.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a with main, from variable frequency power supply's energy storage control circuit parallelly connected processing, realized by the many reliable energy storage and the control from variable frequency power supply's energy storage circuit of a main variable frequency power supply control, satisfied centralized control, operate advantage such as few, the risk is low, reliability height.
2. Energy storage circuits of the master-slave machine variable frequency power supply are connected through optical fibers through parallel signal processing circuits, integrated design is carried out, and the master-slave machine variable frequency power supply is controlled by the master variable frequency power supply to ensure the synchronism of silicon controlled rectifier energy storage signals. The parallel signal processing circuit is divided into a single machine mode and a parallel mode, the main control circuit after the normal startup of each variable frequency power supply is realized through setting, and when the single machine mode is set, each signal for parallel connection is set to be in a normal state and is not collected; only when the parallel mode is set, the control loop of the main frequency conversion power supply can collect and process each signal of the signal parallel loop, thereby avoiding the collection confusion and false alarm of the signals under each state and reducing the fault points.
3. When a plurality of variable frequency power supplies are operated in parallel, in the energy storage stage, when an energy storage loop of any one variable frequency power supply fails, a fault signal is sent to the failed variable frequency power supply, the failed variable frequency power supply makes response protection through logic judgment and is cut off and output by a main variable frequency power supply, the whole parallel system stops operating, the reliability of a test system is improved, and the safety of equipment and the test system is ensured.
4. The main variable frequency power supply and the slave variable frequency power supply can be used in parallel, and can also independently run, the expansibility is good, and any variable frequency power supply can be used as the main variable frequency power supply.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the control of the parallel signal processing circuit of the present invention;
the corresponding part names indicated by the numbers and letters in the drawings:
10. the system comprises a main variable frequency power supply 11, an interface 12, a parallel signal processing circuit 13, a control circuit 14, a monitoring circuit 15, a feedback circuit 16, an energy storage control circuit 17, an energy storage unit 20, a slave variable frequency power supply 21, an interface 22, a parallel signal processing circuit 23, a control circuit 24, a monitoring circuit 25, a feedback circuit 26, an energy storage control circuit 27, an energy storage unit 30, an optical fiber transmission line 40 and a signal processing module.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
Referring to fig. 1 and 2, the utility model discloses a silicon controlled energy storage control device for a plurality of parallel variable frequency power supplies; the silicon controlled energy storage control device comprises at least one variable frequency power supply, and when the number of the variable frequency power supplies exceeds one, one main variable frequency power supply is provided, and the other variable frequency power supplies are all slave variable frequency power supplies. The interface on the slave variable frequency power supply is connected with the interface on the main variable frequency power supply in parallel through optical fibers, and control and protection signals among the plurality of variable frequency power supplies are transmitted by adopting the optical fibers, so that the synchronism of the signals and the control is ensured; the interface on the main variable frequency power supply is connected with the parallel signal processing loop on the main variable frequency power supply, and the interface on the slave variable frequency power supply is connected with the parallel signal processing loop on the slave variable frequency power supply; the slave variable frequency power supply sends an abnormal signal of an energy storage loop on the slave variable frequency power supply to the master variable frequency power supply through the parallel signal processing loop, the master variable frequency power supply sends a control signal of the energy storage loop to the slave variable frequency power supply through the parallel signal processing loop, and the master variable frequency power supply sends an interrupt signal when receiving the abnormal signal.
The input ends of the master variable frequency power supply and the slave variable frequency power supply are respectively connected with three-phase alternating voltage, and the three-phase input ends of the master variable frequency power supply and the slave variable frequency power supply are required to be in one-to-one correspondence and in phase; the main variable frequency power supply and the slave variable frequency power supply can be used in parallel, and can also independently run, the expansibility is good, any variable frequency power supply can be used as the main variable frequency power supply, and specifically, when three-phase 380V alternating current is input and stored in a capacitor through a rectifier bridge, signals from a signal parallel loop are respectively received, and the energy storage loop is stored; the master variable frequency power supply and the slave variable frequency power supply can be independently used, and the energy storage loops of a plurality of variable frequency power supplies can be connected in parallel and combined for use through optical fibers.
The master and slave variable frequency power supplies respectively comprise a control loop, a monitoring loop, a feedback loop, an energy storage control loop, a parallel signal processing loop and an energy storage unit; the control loop is connected with the parallel signal processing loop through an electric signal to realize the control and state monitoring of the energy storage loop; the monitoring circuit is mainly used for detecting whether the direct-current voltage on two sides of the energy storage capacitor on the energy storage circuit is within a normal allowable range; the feedback loop is mainly used for transmitting and receiving alarm signals from a silicon controlled rectifier and an energy storage capacitor on the energy storage loop, so that the energy storage loop is monitored and protected in real time; the energy storage control loop mainly completes the control of triggering, opening and closing of the controllable silicon on the energy storage loop; the parallel signal processing circuit is mainly used for controlling the main variable frequency power supply to each secondary variable frequency power supply to the energy storage circuit, is connected with the monitoring circuit through optical fiber signals and receives data acquired by the monitoring circuit; the parallel signal processing loop is connected with the feedback loop through an optical fiber signal and receives an abnormal signal of the energy storage loop; the parallel signal processing circuit is connected with the energy storage control circuit through optical fiber signals to realize the control of the energy storage signals; when three-phase 380V alternating current is input and energy is stored in the capacitor through the rectifier bridge, the energy storage control circuit receives a control signal from the signal parallel circuit and stores energy in the energy storage circuit; the energy storage loop comprises a controlled silicon and an energy storage capacitor, and the controlled silicon is connected with the energy storage capacitor through a copper bar; the monitoring loop, the energy storage control loop and the feedback loop are all connected with the energy storage loop through electric signals, and real-time monitoring and control over the energy storage loop are achieved.
The main frequency conversion power supply or the secondary frequency conversion power supply converts three-phase 380V alternating current into direct current voltage after passing through the energy storage loop, wherein a control loop of any frequency conversion power supply is equivalent to a human neural center and is used for coordinating safe and reliable work of each part, and the control of each module, the measurement and display of each parameter, the reception of an external input instruction, the realization of various protections of a system and the like are included.
The parallel signal processing circuit is mainly used for realizing the control of the master frequency conversion power supply to each slave frequency conversion power supply to the energy storage circuit, and the signals of the master and slave machines are transmitted through optical fibers and controlled by the master frequency conversion power supply, so that the synchronism of the silicon controlled energy storage signals is ensured; the parallel signal processing circuit is divided into a single machine mode and a parallel mode, the control circuit of the main variable frequency power supply after the normal startup of each variable frequency power supply is realized through setting, and when the control circuit is set to be the single machine mode, all signals for parallel connection are set to be in a normal state and are not collected; only when the parallel mode is set, the control loop of the main frequency conversion power supply can collect and process each signal of the signal parallel loop, and the collection confusion and false alarm of the signals under each state are avoided.
The parallel signal processing loop consists of an optical fiber transmission line and a signal processing module; wherein: the optical fiber transmission line is used for transmitting a control signal and an abnormal signal which are sent by the main variable frequency power supply and are used for an energy storage loop to the main variable frequency power supply, the slave variable frequency power supply is responsible for receiving the signal sent by the optical fiber transmission line, and when the slave variable frequency power supply is abnormal, the abnormal signal is sent to the main variable frequency power supply through the optical fiber transmission line; the signal processing module processes the detected data, abnormity and control signals and then sends two paths of same signals, one path of same signals is sent to the main variable frequency power supply, the other path of same signals is transmitted to the slave variable frequency power supply through the optical fiber transmission line, all states and control of the energy storage loop are synchronized, and when the main variable frequency power supply receives the abnormal signals sent by the parallel signal processing loop, the main variable frequency power supply interrupts operation and sends a brake separating instruction.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. Many for parallelly connected variable frequency power supply silicon controlled rectifier energy storage control device, its characterized in that, silicon controlled rectifier energy storage control device includes:
the main frequency-conversion power supply is provided with a frequency-conversion power supply,
the interface on the slave variable frequency power supply is connected in parallel with the interface on the main variable frequency power supply through a light drill rod;
the input ends of the master variable frequency power supply and the slave variable frequency power supply are respectively connected with three-phase alternating voltage, and each input end of each variable frequency power supply must be in phase;
the main and the slave variable frequency power supplies all comprise:
the control loop is connected with the parallel signal processing loop through an electric signal to realize the control and state monitoring of the energy storage loop;
the monitoring circuit is mainly used for detecting whether the direct-current voltage on two sides of the energy storage capacitor on the energy storage circuit is within a normal allowable range;
the feedback loop is mainly used for transmitting and receiving alarm signals from a silicon controlled rectifier and an energy storage capacitor on the energy storage loop, so that the energy storage loop is monitored and protected in real time;
the energy storage control circuit is mainly used for triggering, opening and closing the controlled silicon on the energy storage circuit;
the parallel signal processing circuit is mainly used for controlling the energy storage circuit from the variable frequency power supply by the main variable frequency power supply, and the parallel signal processing circuit is connected with the monitoring circuit through optical fiber signals and receives data acquired by the monitoring circuit; the parallel signal processing loop is connected with the feedback loop through an optical fiber signal and receives an abnormal signal of the energy storage loop; the parallel signal processing circuit is connected with the energy storage control circuit through optical fiber signals to realize the control of the energy storage signals;
the energy storage circuit comprises a controlled silicon and an energy storage capacitor, and the controlled silicon is connected with the energy storage capacitor through a copper bar;
the monitoring loop, the energy storage control loop and the feedback loop are all connected with the energy storage loop through electric signals, and real-time monitoring and control over the energy storage loop are achieved.
2. The scr energy storage control system of claim 1, wherein the interface of the master variable frequency power supply is connected to the parallel signal processing circuit of the master variable frequency power supply, and the interface of the slave variable frequency power supply is connected to the parallel signal processing circuit of the slave variable frequency power supply.
3. The scr energy storage control system of claim 1, wherein the master variable frequency power supply sends the control signal of the energy storage circuit to the slave variable frequency power supply through the parallel signal processing circuit, and the slave variable frequency power supply sends the abnormal signal of the energy storage circuit on the slave variable frequency power supply to the master variable frequency power supply through the parallel signal processing circuit.
4. The silicon controlled energy storage control device for multiple parallel variable frequency power supplies according to claim 1, wherein the parallel signal processing circuit is divided into a single machine mode and a parallel mode, the control circuit of the main variable frequency power supply after each variable frequency power supply is normally started is realized by setting, and when the control circuit is set to be the single machine mode, each signal for parallel connection is set to be a normal state and is not collected; only when the parallel mode is set, the control loop of the main frequency conversion power supply can collect and process each signal of the signal parallel loop, and the collection confusion and false alarm of the signals under each state are avoided.
5. The silicon controlled energy storage control device for multiple parallel variable frequency power supplies according to claim 1, wherein the parallel signal processing loop is composed of an optical fiber transmission line and a signal processing module; wherein: the optical fiber transmission line is used for transmitting a control signal and an abnormal signal which are sent by the main variable frequency power supply and are used for an energy storage loop to the main variable frequency power supply, the slave variable frequency power supply is responsible for receiving the signal sent by the optical fiber transmission line, and when the slave variable frequency power supply is abnormal, the abnormal signal is sent to the main variable frequency power supply through the optical fiber transmission line; the signal processing module processes the detected abnormal data and the control signal and sends two paths of same signals, one path of same signals is sent to the main variable frequency power supply, the other path of same signals is transmitted to the slave variable frequency power supply through the optical fiber transmission line, all states and control of the energy storage loop are synchronized, and when the main variable frequency power supply receives the abnormal signals sent by the parallel signal processing loop, the main variable frequency power supply interrupts operation and sends a brake separating instruction.
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| CN201921859141.3U CN210780228U (en) | 2019-10-31 | 2019-10-31 | Silicon controlled energy storage control device for multiple parallel variable frequency power supplies |
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Effective date of registration: 20210426 Address after: 201108 building 3 and 4, No. 4399, Jindu Road, Minhang District, Shanghai Patentee after: SHANGHAI SIYUAN PHOTOELECTRIC Co.,Ltd. Patentee after: SIEYUAN ELECTRICAL Co.,Ltd. Address before: 201108, No. 4399 Jin Du Road, Shanghai, Minhang District Patentee before: SIEYUAN ELECTRICAL Co.,Ltd. |