Intelligent rapid emergency power supply system for monitoring high-voltage short-circuit characteristic information by centralized method

Abstract

The invention provides an intelligent rapid emergency power supply system for monitoring high-voltage short-circuit characteristic information by a centralized method, relates to the field of smart power grids and uninterruptible power supplies, and is mainly characterized in that characteristic information monitoring module groups Xa1 to Xa3, Xb1 to Xb3, Xc1 to Xc3 and a shared wide-range switch MS are additionally arranged at phases A, B and C of a commercial power direct transmission branch of a standard ISPS; the ISPS is used for capturing, processing and transmitting characteristic information of a high-voltage short circuit, and starting output end conversion in advance according to the characteristic information, so that a conversion index Tlt is ensured; the time is 0.01 ms. The system further comprises an intelligent controller IPo, a composite quick circuit changer Cf and an abnormal emergency branch Ae which are related to feature information, and further comprises a mains supply direct transmission branch Dt, monitoring instruments IA, IA1-IA3, an intelligent storage battery unit IIU, related switches and other components which are necessary for the ISPS system. At the moment of high-voltage short circuit, the feature information of each feature information monitoring module group is sent to the IPo after being processed by the MS in a centralized manner, and the IPo controls the Cf to convert in advance.

Description

Technical Field

[0001] The present application relates to the fields of smart grids and uninterruptible power supplies, and in particular to an intelligent fast emergency power supply system that monitors high-voltage short-circuit characteristic information in a centralized manner. Technical Background

[0002] Today, with the rapid advancement of power and electronics technologies, the resilience of most critical loads to grid conditions has greatly improved, making historically relevant indicators like frequency stability, voltage stability, and seamless operation obsolete. Furthermore, the natural parameters of the power supply network now exceed the requirements of critical load equipment, making it possible to directly supply power to these loads. Therefore, for most critical loads on ~380V / 220V power supply systems, the only critical requirement is uninterrupted or uninterrupted power. Therefore, the Intelligent Swift Emergency Power System (ISPS) standard (hereinafter referred to as the "Standard ISPS") is a natural alternative to traditional uninterruptible power supplies (UPS), possessing both practical and historical significance. Because the Standard ISPS utilizes an energy-saving mode that prioritizes external grid power output, it not only avoids the drawbacks of traditional UPSs, such as high energy consumption, significant thermal hazards, active harmonic generation, and high failure rates, but also addresses the challenge of ensuring absolute seamless operation at the output end, a challenge that UPSs have struggled to address.

[0003] The technical measure used by the standard ISPS to ensure uninterrupted power supply at the output end is to leverage the "serious parameter anomaly" information that appears immediately before a power outage in the distribution network to quickly initiate output switching, ensuring that the power interruption caused by the switching, T, is ≤ 10ms (as specified in the specifications and standards). For outages caused by grid faults (excluding those caused by human error), the standard "T / ASC04-2019" (the standard designation for the standard ISPS) stipulates T<0.01ms. This takes into account the reality that some aging, critical load equipment, at the end of its life, may experience severe functional degradation, significant device parameter drift, and even a 1ms power outage can cause an incident. However, for short-circuit faults in the high-voltage power supply network, there is a long transition time (hundreds of milliseconds) because one or more transformers and power supply lines of different voltage levels are between the short-circuit point and the ~380 / 220V distribution network (hereinafter referred to as the "terminal network") where the ISPS is located. The "serious parameter abnormality" message will not appear in the terminal network until the short circuit triggers the tripping of the high-voltage circuit breaker and the transition time of the line and transformer (within 200 milliseconds) has passed. However, at this time, the terminal network voltage has dropped below 85%, entering the final stage of physical power outage. The time left for the ISPS control output to switch is very limited, and T<0.01ms cannot be guaranteed.

[0004] Therefore, to ensure that the power supply to old and important loads is not interrupted at the moment of a high-voltage network short-circuit fault, we cannot wait until the normal parameters of the terminal network become "severely abnormal" before starting the output-end conversion. We should find characteristic information that is not affected by the grid transition process and can instantly characterize the occurrence of a short-circuit fault in the high-voltage power supply network. Using this information, we can start the output-end conversion of the ISPS when a short-circuit fault occurs in the high-voltage power supply network and before the terminal network shows "serious parameter abnormality" information, thereby ensuring the reliability of power supply to old and important loads.

[0005] Practice has demonstrated that for any of the four types of short-circuit faults that have occurred in high-voltage power supply networks, a cluster of mutations or variants of information with distinct forms, characteristics, and features emerges from the moment of fault onset, under the influence of short-circuit power and electromagnetic fields. These information is transmitted, unimpeded by the transient process, via lines and transformers to distant locations, including the terminal network. This information can be monitored via both three-phase and single-phase lines, and some can even be detected in the neutral line of the terminal network system. The information includes both non-electrical and electrical quantities. Each phase of any short-circuit fault generates a cluster of information, with the total number of emerging information for three-phase circuits exceeding dozens. Because the appearance of this information signals the occurrence of a short-circuit fault in the power supply network, it is referred to as "signature information." Because this information reaches the terminal network far earlier than the "serious parameter anomaly" message, its use in initiating ISPS output switching ensures that the ISPS switching specification, even under high-voltage short-circuit conditions, meets the T<0.01ms requirement. In practice, characteristic information can also serve the rapid analysis and rapid handling of power outages in the management of modern power grids. Summary of the Invention

[0006] The purpose of this application is to provide an intelligent rapid emergency power supply system (ISPS) that monitors the characteristic information of high-voltage short circuits in a centralized manner. That is, on the basis of the standard ISPS structure, a characteristic information monitoring module group that centrally monitors the characteristic information of short circuits (i.e., high-voltage short circuits) in the high-voltage power supply network and a wide-range switch that centrally processes the characteristic information captured by all monitoring modules are added, and the relevant units or modules of the standard ISPS are appropriately optimized to form a new intelligent rapid emergency power supply system (ISPS). The characteristic information of various short circuit faults in the high-voltage power supply network captured by the characteristic information monitoring module group is used to start the ISPS output end conversion in advance, thereby further improving the reliability of the ISPS power supply to old and important loads.

[0007] Because any type of short-circuit fault mutation can generate dozens of energy variation and non-energy mutation signatures on each phase of the A, B, and C lines, it is generally not necessary to utilize all of them unless specifically needed. In practice, the "group method," "attribute method," "centralization method," and "symbol method" can be used to construct a high-voltage short-circuit characteristic information monitoring solution.

[0008] This application adopts a "centralized" monitoring method, that is, a set of characteristic information monitoring module groups for monitoring characteristic information is set on the power incoming line side or each phase A, B, and C of the mains direct transmission branch. Each group contains one monitoring module for characteristic information of power variation, harmonic mutation, and impedance mutation. The characteristic information of different types, personalities, and intensities monitored by the characteristic information monitoring module groups of each phase are uniformly transmitted to the wide-range switch MS, which is centrally analyzed and processed by the MS and converted into a unified signal and then transmitted to the intelligent controller IPo, so that the IPo can control the conversion of the ISPS output end in advance, thereby further improving the power supply reliability of the standard ISPS.

[0009] To achieve the above objectives, the present application provides a solution for an intelligent rapid emergency power supply system (ISPS) that centrally monitors high-voltage short-circuit characteristic information as follows:

[0010] An intelligent rapid emergency power supply system (ISPS) for centralized monitoring of high-voltage short-circuit characteristic information includes: an intelligent controller IPo, a characteristic information monitoring module group for monitoring high-voltage short-circuit characteristic information (including monitoring modules Xa1, Xb1, and Xc1 for power variation characteristic information; monitoring modules Xa2, Xb2, and Xc2 for harmonic mutation characteristic information; and monitoring modules Xa3, Xb3, and Xc3 for impedance mutation characteristic information), a wide-range switch MS, a composite rapid circuit breaker, a mains direct transmission branch Dt, an abnormal emergency branch Ae, a smart battery unit IIU, and intelligent instruments IA, IA1, IA2, and IA3 for monitoring operating parameters.

[0011] This system uses any set of characteristic information captured by monitoring modules Xa1, Xb1 and Xc1, monitoring modules Xa2, Xb2 and Xc2, and monitoring modules Xa3, Xb3 and Xc3 as its basis. At the moment when a high-voltage short circuit occurs but before the power is tripped and cut off, it starts the output end conversion of the ISPS in advance, solving the problem that the standard ISPS cannot guarantee the output end conversion indicator T<0.01ms when the high-voltage short circuit trips and the power is cut off.

[0012] The intelligent controller IPo can be a single-chip microcomputer, microcomputer, industrial personal computer, editable logic controller, or a logic control module with analysis, calculation, and judgment capabilities, or a parameter monitoring instrument with an embedded computer chip. Its functions include controlling the orderly operation of all components, modules, and units, monitoring information from a wide range of switches and all instruments, and monitoring the operating status of all units and controlled devices. Under IPo control, the ISPS normally operates in a direct mains power transmission mode. If a "serious parameter anomaly" message appears in the terminal network, it automatically switches to an emergency power supply mode and then to a battery inverter power supply mode. If a high-voltage short-circuit characteristic message appears in the terminal network, it automatically switches to an emergency power supply mode. During the emergency power supply period, if the characteristic message disappears before reaching a set value, the system automatically switches back to direct mains power transmission. If the characteristic message persists for a set value, the system automatically switches to a battery inverter emergency power supply mode. If the mains parameters return to normal during the battery inverter emergency power supply mode, the system returns to direct mains power transmission mode.

[0013] The control signal lines of the IPo connect all controlled components and units, all parameter monitoring instruments and wide range switches representing the characteristic information of high voltage short circuit faults.

[0014] The characteristic information monitoring module group for monitoring the characteristic information of high-voltage short-circuit faults are all inductive power electronic intelligent chips or intelligent modules. Among them, Xa1, Xb1, and Xc1 are respectively used to monitor the characteristic information of the quantity (current and voltage) variation of the high-voltage short-circuit sudden change in phases A, B, and C; Xa2, Xb2, and Xc2 are respectively used to monitor the characteristic information of the harmonic mutation of the high-voltage short-circuit instantaneous sudden change in phases A, B, and C; Xa3, Xb3, and Xc3 are respectively used to monitor the characteristic information of the impedance mutation of the high-voltage short-circuit instantaneous sudden change in phases A, B, and C. The characteristic information monitoring modules for monitoring the characteristic information above can be installed at any position on the mains direct transmission branch or the incoming power supply side.

[0015] The wide-range switch MS is an intelligent semiconductor switch composed of various semiconductor devices, modules or chips, embedded with intelligent software, and capable of converting signals of different categories, intensities and characteristics into a unified signal pattern. The finished product can be a semiconductor module or a parameter monitoring instrument, and its multiple input ends are connected to the output signal lines of the monitoring modules Xa1, Xb1, Xc1, Xa2, Xb2, Xc2, Xa3, Xb3 and Xc3 used to monitor characteristic information, while the output ends are connected to the control signal lines of the intelligent controller IPo.

[0016] The composite fast circuit breaker comprises a composite switch ICS1 and a composite switch ICS2. Composite switch ICS1 comprises a contact switch Q1 and a contactless switch I1 connected in parallel, while composite switch ICS2 comprises a contact switch Q2 and a contactless switch I2 connected in parallel. The input of composite switch ICS1 (i.e., the parallel inputs of contactless switches I1 and Q1) is connected to the AC direct power transmission branch, while the input of composite switch ICS2 (i.e., the parallel inputs of contactless switches I2 and Q2) is connected to the output of LC within the abnormal emergency branch Ae. The output of composite switch ICS1 (i.e., the parallel output of contactless switches I1 and Q1) and the output of composite switch ICS2 (i.e., the parallel output of contactless switches I2 and Q2) are connected in parallel, and then connected to the critical load via output switch S2.

[0017] The contact switch Q1 is used to continuously carry the load current in the AC direct power supply mode, and the contact switch Q2 is used to continuously carry the load current in the abnormal emergency power supply mode or the battery inverter emergency power supply mode. The contact switch Q1 and the contact switch Q2 can be various types of contactors, various types of relays and various other electric types of electromechanical switches.

[0018] The contactless switches I1 and I2 are used to carry load current during the transition between the mains direct power supply mode and the emergency power supply mode. They can be various dual-control power electronic switching devices or modules, including but not limited to thyristors, power MOS transistors, IGBTs, IPMs, IGCTs, IEBTs, and power semiconductor devices or modules made of gallium nitride or silicon carbide.

[0019] The abnormal emergency branch Ae consists of a surge-resistant rectifier RU, an enhanced inverter ELn, and a filter LC, connected in series. If the potential for surge current during the switching moment is not a concern, the RU can be a standard rectifier or rectifier module. If the potential for overload during the emergency power supply period is not a concern, the ELn can also be a standard inverter or inverter module. The RU's input is connected to the output of the incoming switch K01, and its output is connected to the input of the ELn and the discharge output of the intelligent battery unit IIU. The output of the ELn is connected to the input of the LC, and the output of the LC is connected to the input of the composite switch ICS2 within the composite fast circuit breaker Cf.

[0020] The intelligent battery unit IIU is a smart energy storage unit that integrates the functions of the battery pack and monitoring unit (BM), intelligent charger IC, and battery online protector (BP) described in T / ASC 04-2019, while also incorporating several new features. In this application, it serves only as a required energy storage unit for the ISPS and is not described in detail. Preferably, the intelligent battery unit IIU can also be a conventional lead-acid intelligent battery unit IIU or a lithium-ion battery pack, provided that the functional requirements are met.

[0021] The parameter monitoring instrument is mainly used to monitor the dynamic parameters under various power supply modes. In this application, IA is used to monitor the dynamic values ​​of normal operating parameters (current, voltage, active power, reactive power, power factor and battery voltage, etc.), IA2 is used to monitor the dynamic values ​​of inverter output parameters, and IA1 and IA3 are used to monitor the "serious abnormality" information of each dynamic parameter. The display dials of IA and IA2 can be set on the ISPS cabinet surface, and IA1 and IA3 may not be provided with display dials. The primary detection elements of all instruments are set on the side of the cabinet close to the corresponding power line. The finished instrument can be a modern intelligent electrical parameter meter, or a DDC-Ⅲ or DDC-Ⅳ type automation instrument or other types of intelligent instruments. The connection relationship between its primary element and the main circuit is the normal connection relationship commonly used in various engineering applications in the industry (or determined by the instrument technical manual), wherein the output signal lines of IA1 and IA3 are connected to the control signal line of the intelligent controller IPo. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the single-line principle of a traditional UPS, which is different from the standard ISPS;

[0023] Figure 2 This is a single-line principle diagram that is different from the standard ISPS of this application;

[0024] Figure 3 Schematic diagram of the ISPS based on centralized monitoring of high-voltage short-circuit characteristic information described in this application;

[0025] Figure 4 This is a wiring diagram for a wide range switch;

[0026] Figure 5 This is a schematic diagram of the high-voltage power supply network. DETAILED DESCRIPTION

[0027] like Figure 1As shown in the figure, the sinusoidal AC power input from the external power grid undergoes rectification, inversion, filtering, and conversion via the output thyristor switch. Regardless of the quality of the external power supply, it is always converted to DC by the AC / DC rectifier module. The DC / AC inverter module then converts the DC to AC pulses (power sine). The filter then processes the AC pulses into standard sinusoidal AC power before delivering it to the critical loads via the thyristor switch SCR2. This conversion and transmission process carries a number of side effects, including energy waste, thermal hazards such as high-temperature damage to semiconductors and batteries, harmonic side effects from rectification, and shortened system life. Furthermore, when inrush current flows at the load end, intelligent bypass switching occurs, resulting in power interruptions. Even more ominous, a short-circuit fault on the load side can cause the inverter to freeze or be damaged, or even lead to serious accidents such as battery fires.

[0028] like Figure 2 As shown, the fundamental difference from a traditional UPS is that after external grid power is introduced through the incoming line switch, it is directly transmitted to the critical load via switch S1, contact switch Q1 within the ISTS, and output switch S2. No semiconductor devices are involved, and no conversion is required, thus eliminating the many drawbacks of a UPS. In the event of a grid failure or power outage, parameter monitoring instruments IA1 and IA3 will detect a "serious parameter anomaly" message immediately before the grid loses power. Based on this information, the control module IPC preemptively initiates power conversion at the output end, ensuring that the parameter T<0.01ms. However, if a short circuit occurs on the high-voltage side of the power supply network, due to the presence of power lines and isolation transformers, it will take IA1 and IA3 over a hundred milliseconds to detect the "serious parameter anomaly" message, making it difficult to maintain T<0.01ms. This poses a serious risk to the power supply of older, critical loads.

[0029] like Figure 3As shown, the differences from the standard ISPS are: 1) a characteristic information monitoring module group is set up to monitor the characteristic information of high-voltage short-circuit faults; 2) the characteristic information is used as the main signal to initiate output-end conversion in the event of a high-voltage short-circuit fault, while the "serious parameter abnormality" information in the standard ISPS architecture is used as the backup signal for output-end conversion; 3) the core control module IPC in the standard ISPS is removed from the "intelligent fast power supply converter ISTS" unit and its new functions are added, making it the intelligent controller IPo of the ISPS system; 4) the "intelligent fast power supply converter ISTS" in the standard ISPS is replaced by a "composite fast power supply converter Cf" controlled by IPo; 5) through the cooperation of the intelligent controller IPo and the characteristic information monitoring module group that monitors characteristic information, an instantaneous transient output function (i.e., "AC-DC-AC" function) of the "abnormal emergency branch" under high-voltage short-circuit conditions is added. The effect of these improvements is that even in the event of a high-voltage short-circuit fault causing a trip and power outage, the conversion of the ISPS output can ensure T<0.01ms, thereby further improving the power supply reliability of the ISPS. The basic operating mode and status of the new ISPS are briefly described as follows.

[0030] 1) Mains direct transmission power supply mode: Under normal mains conditions (i.e., "normal conditions"), the mains power is transmitted directly to the load through the incoming switch K01 along the mains direct transmission branch Dt, through the switch S1, the contact switch Q1 of ICS1 in the composite fast circuit changer Cf, and the output switch S2.

[0031] 2) Abnormal Emergency Power Supply Mode: At the instant a characteristic signal appears on the terminal network, the intelligent controller IPo controls the positive switching between the composite switches ICS1 and ICS2 within the composite fast-acting circuit breaker Cf and activates the battery discharge switch. The system seamlessly transitions from direct utility power supply mode to abnormal emergency power supply mode. During this transition, utility power flows through the incoming switch K01, the surge-resistant rectifier RU, the enhanced inverter ELn, and the filter LC of the abnormal emergency branch Ae, and finally through the contactor switch Q2 and output switch S2 of ICS2 in Cf to the load.

[0032] 3) In battery inverter power supply mode, when the system enters emergency power supply mode, the discharge switch of the intelligent battery unit IIU automatically turns on, preparing for battery inverter power supply. When the characteristic information duration reaches the set value, or when the terminal network displays a "serious parameter abnormality" message, the IPo controls the impact-resistant rectifier RU to shut down, and the system enters battery inverter power supply mode.

[0033] 4) Restore AC power direct transmission: In abnormal emergency power supply mode or battery power supply mode, if the AC power parameters of the terminal network have returned to normal, the intelligent controller IPo controls the composite switches ICS1 and ICS2 in the composite fast switch Cf to complete "negative conversion" and turn off the battery discharge switch, seamlessly restoring the system to AC power direct transmission mode.

[0034] 5) Functional Improvement: The "serious parameter anomaly" information from IA1 and IA3 in the standard ISPS can be used as a backup feature to start the output conversion program in the event of a high-voltage short-circuit fault, ensuring that the conversion index T at the ISPS output is ≤ 10ms. In the event of a non-high-voltage short-circuit power grid fault, it can be used as the main information to determine the precursor of the fault power outage and start the output conversion program to ensure that the conversion index T at the ISPS output is < 0.01ms.

[0035] As described above, for the "positive transition" or "negative transition" between ICS1 and ICS2 within Cf, the operating sequence of its internal contactless switches I1 and I2 and contact switches Q1 and Q2 is: positive transition: I1 on → Q1 off → I1 off → I2 on → Q2 on → I2 off; negative transition: I2 on → Q2 off → I2 off → I1 on → Q1 on → I1 off.

[0036] Implementation method of the primary circuit structure.

[0037] like Figure 3 As shown, the mains power is introduced through switch K01 and split into two paths: one connected to the input of switch S1 in the mains direct transmission branch Dt; the other connected to the input of the surge-resistant rectifier RU in the emergency branch Ae. The output of S1 is directly connected to the input of the composite switch ICS1 in the composite fast-acting circuit breaker Cf (i.e., the parallel inputs of contactor switch Q1 and contactless switch I1). The output of RU in the emergency branch is connected to the input of the enhanced inverter ELn and the discharge port of the smart battery unit IIU. The output of ELn is connected to the input of the filter LC, and the output of LC is connected to the input of the composite switch ICS2 in the composite fast-acting circuit breaker (i.e., the parallel inputs of contactor switch Q2 and contactless switch I2). The output of ICS1 (i.e., the parallel outputs of I1 and Q1) and the output of ICS2 (i.e., the parallel outputs of Q2 and I2) are connected in parallel and then connected to the input of output switch S2. The output of S2 is then connected to the load distribution box.

[0038] Secondary circuit structure implementation method.

[0039] like Figure 3As shown, an inductive characteristic information monitoring module group Xa1, Xa2, Xa3, Xb1, Xb2, Xb3, Xc1, Xc2 and Xc3 is set at any position along the power supply line side or the mains direct transmission branch close to the power line to monitor the characteristic information of the high-voltage short-circuit fault. The signal output end of each intelligent mode is connected to the input end of the wide-range switch MS, and the signal output end of MS is connected to the control signal line of the intelligent controller IPo, as shown Figure 4 As shown, the installation location of the MS is not limited.

[0040] The display panel of parameter monitoring instrument IA is installed on the ISPS cabinet, and its primary and secondary wiring are the same as the conventional methods of traditional UPS and standard ISPS; the display panel of IA2 is installed on the ISPS cabinet, and its information sampling point is located at any position between the output end of the filter LC and the input end of the composite fast circuit changer Cf. Its primary and secondary wiring can be implemented according to the requirements of the product manual; IA1 and IA3 can only have primary monitoring elements, among which the information sampling point of IA1 is located at any position on the power supply line side or the mains direct transmission branch, and the information sampling point of IA3 is located between Cf and S2 or at any position of the output end. The signal lines of IA1 and IA3 are connected to the control signal lines of the intelligent controller IPo.

[0041] The control signal line of the intelligent controller connects the wide-range switch MS and IA, IA1, IA2 and IA3; connects the controlled coil switches of the contact switches Q1 and Q2 in the composite fast circuit changer Cf; connects the control poles of the contactless switches I1 and I2 in Cf; connects the impact-resistant rectifier RU, enhanced inverter ELn and filter LC of the abnormal emergency branch; connects the smart battery unit IIU and the related switches inside it.

[0042] K01 is an electromechanical switch with overload protection and short-circuit protection functions, including but not limited to automatic load switches or automatic air switches; S1 is an ordinary electromechanical switch, including but not limited to ordinary isolating switches or various manual switches with protection functions; the output switch S2 can be a switch with or without protection, manual or electric; the contact switch Q1 and the contact switch Q2 in the composite fast circuit changer Cf can be various contactors, various relays and other electric types of electromechanical switches, among which the contact switch Q1 is used to carry the load current in the AC direct transmission mode, and the contact switch Q2 is used to carry the load current in the abnormal emergency mode or the battery inverter emergency mode; and the contactless switch I1 and the contactless switch I2 in the composite fast circuit changer Cf are used to carry the load current in the instant of switching between the AC direct transmission power supply mode and the abnormal emergency power supply mode. Load current, the finished product can be various types of dual-control power electronic switching devices or modules, including but not limited to thyristors, power MOS, IGBT, IPM, IGCT, IEBT and gallium nitride, silicon carbide-type power semiconductor devices or modules; the pit impact rectifier RU in the abnormal emergency branch Ae is a rectifier device or module that can resist current impact. When there is no load-side current impact at the moment of abnormal emergency, the pit impact rectifier RU can also be an ordinary rectifier device or module; similarly, the enhanced inverter ELn in the abnormal emergency branch Ae refers to an inverter device or module with overload carrying capacity under emergency conditions. When the load under emergency conditions does not have the possibility of overload, the enhanced inverter ELn can also be an ordinary inverter device or module; and the filter LC in the abnormal emergency branch Ae can be any type of filtering device or module.

[0043] Practice has proved that this application not only maintains the energy-saving, environmentally friendly, intelligent, safe, reliable and long-life characteristics of the standard ISPS compared to UPS power supply, but also ensures that the conversion index T of the ISPS output end is less than 0.01ms when a short circuit occurs in the high-voltage power supply network, making the ISPS power supply system safer, more reliable and more complete, which has both practical and historical significance. Figure 5 As shown, the ~380V / 220V network is taken as the terminal as an example, and the 10kV~220kV network is the high-voltage power supply network.

[0044] In reality, the technology of centralized monitoring of high-voltage short-circuit characteristic information can assist in the rapid monitoring, automatic dispatching and automatic emergency response of modern smart grids, so as to shorten the power outage time of the lower-level network caused by high-voltage short circuits. However, this application only uses it to control the rapid conversion of the ISPS output end in advance to ensure that when a short circuit fault occurs in the high-voltage power supply network, the important loads in the terminal power supply network will not be at risk of power interruption.

[0045] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. An intelligent rapid emergency power supply system for centralized monitoring of high-voltage short-circuit characteristic information, characterized by: On the A, B, and C phases of the standard ISPS mains incoming line or mains direct transmission branch, characteristic information monitoring module groups Xa1 to Xa3, characteristic information monitoring module groups Xb1 to Xb3, and characteristic information monitoring module groups Xc1 to Xc3 are added, along with a shared wide-range switch MS. Each characteristic information monitoring module group is used to capture high-voltage short-circuit characteristic information. The wide range switch MS is used to process and transmit characteristic information representing a high voltage short circuit fault from the characteristic information monitoring module group; the high voltage short circuit is a short circuit of the high voltage power supply network; The intelligent fast emergency power supply system includes the characteristic information monitoring module group, the intelligent controller IPo, the composite fast switch Cf and the abnormal emergency branch Ae, and is equipped with the mains direct transmission branch Dt of the ISPS, the parameter monitoring instrument IA, the parameter monitoring instrument IA1, the parameter monitoring instrument IA2, the parameter monitoring instrument IA3 and the intelligent battery unit IIU; At the moment of high-voltage short circuit, the characteristic information from each characteristic information monitoring module is centrally processed by the wide-range switch MS and then sent to the intelligent controller IPo. The intelligent controller IPo controls the output end conversion of the composite fast circuit switch Cf in advance, switching the output of the mains direct transmission branch Dt to the abnormal emergency branch Ae, realizing seamless output conversion. The working characteristics of the intelligent fast emergency power supply system are: operating in the mains direct transmission power supply mode under normal circumstances; seamlessly switching to the abnormal emergency power supply mode at the moment the intelligent controller IPo detects characteristic information; seamlessly switching to the battery inverter emergency power supply mode at the moment the characteristic information duration reaches the set value or the terminal network has power outage precursor information; during the abnormal emergency power supply mode or the battery inverter emergency power supply mode, if the mains power returns to normal, it seamlessly switches back to the mains direct transmission operation mode; the power outage precursor information is "serious parameter abnormality" information.

2. The intelligent fast emergency power supply system for centralized monitoring of high-voltage short-circuit characteristic information according to claim 1 is characterized in that: The intelligent controller IPo is used to control the orderly operation of all components and units, monitor the information of all monitoring modules and parameter monitoring instruments, and control the conversion of the ISPS output end according to the "serious parameter anomaly" information or characteristic information. The finished product of the intelligent controller IPo is a single-chip microcomputer, microcomputer, industrial computer, programmable controller, logic control module with analysis, calculation and judgment functions, or parameter monitoring instrument with embedded computer chip. The control signal line of the intelligent controller IPo connects all instruments, intelligent modules, controlled components, controlled units and related components inside the intelligent battery unit IIU.

3. The intelligent fast emergency power supply system for centralized monitoring of high-voltage short-circuit characteristic information according to claim 1 or 2, characterized in that the characteristic information The monitoring module group is used to monitor the characteristic information of high-voltage short-circuit faults; among them, the monitoring modules Xa1, Xb1 and Xc1 are respectively used to monitor the characteristic information of power variation of high-voltage short-circuit sudden changes in phases A, B and C; the monitoring modules Xa2, Xb2 and Xc2 are respectively used to monitor the characteristic information of harmonic mutation of high-voltage short-circuit sudden changes in phases A, B and C; the monitoring modules Xa3, Xb3 and Xc3 are respectively used to monitor the characteristic information of impedance mutation of high-voltage short-circuit sudden changes in phases A, B and C; The output signals of all monitoring modules are centrally transmitted to the wide range switch MS, which processes them centrally and then transmits them to the intelligent controller IPo; The finished product of the monitoring module is an inductive power electronic chip, module or instrument embedded with software and having processing, calculation and editing functions; the output signal of the monitoring module is a dynamic current signal of 4 to 20 mA or a dynamic voltage signal of 1 to 5 V.

4. The intelligent fast emergency power supply system for centralized monitoring of high-voltage short-circuit characteristic information according to claim 1, 2 or 3, characterized in that: The wide range switch MS is composed of semiconductor devices, modules or chips; The wide range switch MS is an intelligent semiconductor switch embedded with intelligent software that can process signal clusters with different intensities and characteristics into a unified signal pattern. The finished product of the wide range switch MS is a semiconductor module, a single chip microcomputer, an intelligent chip with single chip microcomputer function or a parameter monitoring instrument.

5. The intelligent rapid emergency power supply system for centralized monitoring of high-voltage short-circuit characteristic information according to claim 1 is characterized in that: The composite fast circuit breaker is composed of a composite switch ICS1 and a composite switch ICS2; wherein the composite switch ICS1 is composed of a contact switch Q1 and a contactless switch I1 connected in parallel; and the composite switch ICS2 is composed of a contact switch Q2 and a contactless switch I2 connected in parallel; The contactless switches I1 and I2 are dual-control power electronic switch devices or modules, including but not limited to power MOS, IGBT, IPM, IGCT, IEBT, gallium nitride, and silicon carbide power semiconductor devices or modules; the control stages of the contactless switches I1 and I2 are connected to the intelligent controller IPo via control signal lines; The contact switch Q1 and the contact switch Q2 are electrically controlled electromechanical switches, including but not limited to contactors, magnetic starters, relays, magnetic saturators, relays and electric transfer switches; the control contacts of the controlled coils of the contact switch Q1 and the contact switch Q2 are connected to the intelligent controller IPo through control signal lines.

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