Short-time energy source system for direct-current power supply line

Abstract

The utility model discloses a short-time energy source system for a DC power supply line, and the system comprises a short-time energy source which supplies power to electric equipment through a first frequency converter when the commercial power is cut off; during normal use, the mains supply supplies power to the electric equipment and the short-time energy source, when the mains supply is cut off, the short-time energy source automatically supplies power to the electric equipment, the response speed of the whole machine is 0ms, the requirements of any load are met, the short-time energy source system adopts a complete parallel structure to be connected into a protected power distribution and supply line, the independent operation is safer, and the efficiency of the whole machine is greater than 98%. The design life of the whole machine is longer than 15 years, maintenance is not needed in the whole process, normal operation can be achieved in any industrial load places, and by means of the function of the protection capacitor, when 0-90% p.u. Low voltage occurs in the system, it can be guaranteed that the voltage of the load side is constant.

Description

Technical Field

[0001] The utility model relates to the technical field of the electric power industry, in particular to a short-time energy source system for a direct current power supply line. Background Art

[0002] With the rapid economic development, the urban electricity load is growing rapidly, the pressure on the power grid to provide stable power is increasing, and users' requirements for power supply reliability and power quality are also increasing. During the operation of power equipment, especially during peak power consumption and severe weather such as typhoons and thunderstorms, accidents that cannot be repaired in a short time are inevitable. At this time, it is urgent to use the emergency power supply of emergency generators to quickly restore the power supply of important users such as residents, which can not only ensure the reliability of power supply, but also is a good reflection of the high-quality service provided by power supply companies. The ability to quickly restore power supply is of great significance to people's normal production and life.

[0003] For example, the prior art disclosure (announcement) number is CN116979672A, an emergency power supply assembly and an emergency power supply device, the mounting plate of the emergency power supply assembly is adapted to be connected to the wire clamp of the isolating switch at the porcelain bottle to be connected, and the connecting coil is arranged at the end of the mounting plate away from the wire clamp, and is used to be connected with the wiring head configured for the emergency power generation vehicle. When power is required, the wiring head configured for the emergency power generation vehicle is connected to the connecting coil to supply power to the corresponding porcelain bottle.

[0004] When power is not needed, the wiring head of the emergency power generation vehicle is separated from the connection coil to achieve power-off processing. It can be seen that after the emergency power supply assembly provided by this embodiment is installed and fixed with the wire clamp, it is only necessary to clamp the wiring head of the emergency power generation vehicle to the connection coil and fix it, and then the emergency power generation vehicle can be started to supply power. In this way, the time for maintenance work can be greatly reduced, so that the grounding work can be completed simultaneously while the medium-voltage temporary power supply work is completed, which can not only improve the efficiency of maintenance workers, but also improve safety.

[0005] However, this patent requires that the emergency power supply component can only provide emergency power after it is installed and fixed with the wire clamp, and the response speed is slow.

[0006] Therefore, it is necessary to design a short-time energy source system for a DC power supply line. Utility Model Content

[0007] The purpose of the utility model is to provide a short-time energy source system for a DC power supply line to solve the problems raised in the background technology.

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] A short-time energy source system for a DC power supply line comprises a short-time energy source. When the city power is cut off, the short-time energy source supplies power to electrical equipment through a frequency converter.

[0010] The above-mentioned short-time energy source system for a DC power supply line, wherein, further comprises a double-pole switch, a diode five, a diode six, a diode seven, and a diode eight, wherein the positive electrode of the protection resistor two is electrically connected to the negative electrode of the diode six, the positive electrode of the diode seven is electrically connected to the negative electrode of the diode eight, the positive electrode of the diode five is electrically connected to the positive electrode of the diode seven, and the negative electrode of the diode six is ​​electrically connected to the negative electrode of the diode eight;

[0011] One connector of the double-pole switch is electrically connected to the live wire C, and the other connector is electrically connected to the negative electrode of the diode five through the protective resistor one;

[0012] Another connector of the double-pole switch is electrically connected to the neutral line N, and another connector thereof is electrically connected to the positive electrode of the diode eight.

[0013] In the above-mentioned short-time energy source system for a DC power supply line, the cathode of the diode eight is electrically connected to an inductor, and the inverter two is electrically connected between the inductor and the anode of the diode seven.

[0014] The above-mentioned short-time energy source system for a DC power supply line, wherein the short-time energy sources are provided with at least two.

[0015] The above-mentioned short-time energy source system for a DC power supply line, wherein the positive electrode of the short-time energy source is electrically connected to the positive electrode of the diode seven, the positive electrode of the short-time energy source is also electrically connected to the positive electrode of the inverter one through the protection resistor two, and the negative electrode of the short-time energy source is electrically connected to the negative electrode of the inverter one through the diode ten.

[0016] In the above-mentioned short-time energy source system for a DC power supply line, a protection capacitor is electrically connected between the cathode of the diode 10 and the protection resistor 2.

[0017] The above-mentioned short-time energy source system for a DC power supply line, wherein the cathode of the diode ten is electrically connected to the cathodes of the diodes two, four and six, the protection resistor two is electrically connected to the anodes of the diodes one, three and five, the cathode of the diode one is electrically connected to the anode of the diode two, the cathode of the diode three is electrically connected to the anode of the diode four, and the cathode of the diode five is electrically connected to the anode of the diode six.

[0018] The above-mentioned short-time energy source system for a DC power supply line, wherein the positive electrode of the diode 2 is electrically connected to the live wire A of the mains, the positive electrode of the diode 4 is electrically connected to the live wire B of the mains, and the positive electrode of the diode 6 is electrically connected to the live wire C of the mains.

[0019] The above-mentioned short-time energy source system for a DC power supply line, wherein the short-time energy source is an energy storage capacitor.

[0020] The utility model has at least the following beneficial effects:

[0021] Wide voltage compensation range: When the system experiences a low voltage of 0-90% pu, the voltage on the load side can be kept constant.

[0022] Fast response speed: The whole machine response speed is 0ms, meeting the requirements of any load.

[0023] Safer: The short-time energy source system adopts a fully parallel structure to access the protected distribution power supply line, and independent operation is safer.

[0024] Strong impact resistance: fully connected in parallel to the power distribution line, the impact current has no effect on VDC.

[0025] High efficiency: The overall efficiency is greater than 98%, saving a lot of electricity costs.

[0026] Long life, maintenance-free: The design life of the whole machine is more than 15 years, and no maintenance is required throughout the whole process.

[0027] Strong adaptability: can operate normally in any industrial load location.

[0028] Small footprint: It occupies only one sixth of the area of ​​UPS with the same capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 This is a circuit schematic diagram of a short-time energy source system for a DC power supply line of the utility model;

[0031] Figure 2 This is a waveform experiment connection diagram of a short-time energy source system for a DC power supply line of the utility model;

[0032] Figure 3 This is a data experimental diagram of the low voltage tolerance capability of the frequency converter itself of the short-time energy source system for the DC power supply line of the utility model;

[0033] Figure 4This is a recording diagram of 2000 power failure compensation tests of the short-time energy source system for DC power supply lines of the utility model;

[0034] Figure 5 This is a diagram of the maximum compensation time experiment of the short-time energy source of the short-time energy source system for a DC power supply line of the utility model.

[0035] Description of Figure Numbers:

[0036] 100. Short-time energy source; 101. Double-pole switch; 102. Protection resistor one; 103. Inverter two; 104. Protection resistor two; 105. Inverter one; 106. Protection capacitor; 110. Diode one; 111. Diode two; 120. Diode three; 121. Diode four; 130. Diode five; 131. Diode six; 121. Diode four; 140. Diode five; 1401. Diode six; 141. Diode seven; 1411. Diode eight; 142. Inductor; 143. Diode nine; 144. Diode ten. DETAILED DESCRIPTION

[0037] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0038] Please refer to Figures 1 to 5 As shown, an embodiment of the utility model provides a short-time energy source system for a DC power supply line, including a short-time energy source 100. When the city power is cut off, the short-time energy source 100 is used to supply power to electrical equipment through a frequency converter 105.

[0039] The double-pole switch 101, the diode 5 130, the diode 6 1401, the diode 7 141, and the diode 8 1411 are also included. The positive electrode of the protection resistor 2 104 is electrically connected to the negative electrode of the diode 6 1401, the positive electrode of the diode 7 141 is electrically connected to the negative electrode of the diode 8 1411, the positive electrode of the diode 5 130 is electrically connected to the positive electrode of the diode 7 141, and the negative electrode of the diode 6 1401 is electrically connected to the negative electrode of the diode 8 1411;

[0040] One terminal of the double-pole switch 101 is electrically connected to the live wire C, and the other terminal thereof is electrically connected to the cathode of the diode 5 130 via the protective resistor 102;

[0041] Another connector of the double-pole switch 101 is electrically connected to the neutral line N, and another connector thereof is electrically connected to the positive electrode of the diode eight 1411 .

[0042] The cathode of the diode eight 1411 is electrically connected to the inductor 142 , and the inverter two 103 is electrically connected between the inductor 142 and the anode of the diode seven 141 .

[0043] There are at least two short-time energy sources 100 .

[0044] Among them, the positive electrode of the short-time energy source 100 is electrically connected to the positive electrode of the diode seven 141, and the positive electrode of the short-time energy source 100 is also electrically connected to the positive electrode of the inverter one 105 through the protection resistor two 104, and the negative electrode of the short-time energy source 100 is electrically connected to the negative electrode of the inverter one 105 through the diode ten 144.

[0045] A protection capacitor 106 is electrically connected between the cathode of the diode 144 and the protection resistor 2 104 .

[0046] Among them, the cathode of diode ten 144 is electrically connected to the cathode of diode two 111, diode four 121 and diode six 1401, the protection resistor two 104 is electrically connected to the anode of diode one 110, diode three 120 and diode five 130, the cathode of diode one 110 is electrically connected to the anode of diode two 111, the cathode of diode three 120 is electrically connected to the anode of diode four 121, and the cathode of diode five 130 is electrically connected to the anode of diode six 1401.

[0047] Among them, the anode of the diode 2 111 is electrically connected to the live wire A of the mains, the anode of the diode 4 121 is electrically connected to the live wire B of the mains, and the anode of the diode 6 1401 is electrically connected to the live wire C of the mains.

[0048] The short-time energy source 100 is an energy storage capacitor.

[0049] Working principle: In normal use, the mains is used to supply power to the electrical equipment and the short-time energy source 100. When the mains is cut off, the short-time energy source 100 automatically supplies power to the electrical equipment. The response speed of the whole machine is 0ms, which meets the requirements of any load. The short-time energy source system adopts a fully parallel structure to access the protected distribution power supply line. It is safer to operate independently. The efficiency of the whole machine is greater than 98%, which saves a lot of electricity costs. The design life of the whole machine is greater than 15 years. It does not require maintenance throughout the whole process and can operate normally in any industrial load location. Through the protection capacitor 106, when the system has a low voltage of 0-90% pu, the voltage on the load side can be kept constant;

[0050] The combined action of diode 1 110, diode 2 111, diode 3 120, diode 4 121, diode 5 130, diode 6 1401, diode 5 130, diode 6 1401, diode 7 141, diode 8 1411, diode 9 143, and diode 10 144 prevents current from flowing back into the mains, thereby preventing damage to the maintenance.

[0051] according to Figures 2 to 5 Experimental data:

[0052] The digital control time relay JS controls the AC contactor KM to open once every 1 minute. After opening, it delays 200 milliseconds and controls the AC contactor KM to close. Every time the AC contactor opens, its auxiliary contact is counted once on the counter, and the total number of simulated power interruptions is no less than 2000 times. The verification time is about 48 hours. The voltage waveform of the power interruption and the inverter output can be captured at any time on the oscilloscope for comparison.

[0053] From the experimental data, we can know that this system:

[0054] Wide voltage compensation range: When the system experiences a low voltage of 0-90% pu, the voltage on the load side can be kept constant.

[0055] Fast response speed: The whole machine response speed is 0ms, meeting the requirements of any load.

[0056] Safer: The short-time energy source system adopts a fully parallel structure to access the protected distribution power supply line, and independent operation is safer.

[0057] Strong impact resistance: fully connected in parallel to the power distribution line, the impact current has no effect on VDC.

[0058] High efficiency: The overall efficiency is greater than 98%, saving a lot of electricity costs.

[0059] Long life, maintenance-free: The design life of the whole machine is more than 15 years, and no maintenance is required throughout the whole process.

[0060] Strong adaptability: can operate normally in any industrial load location.

[0061] Small footprint: It occupies only one sixth of the area of ​​UPS with the same capacity.

[0062] The above description shows and describes several preferred embodiments of the utility model, but as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A short-time energy source system for a DC power supply line, characterized in that: It comprises a short-time energy source (100), and when the city power is cut off, the short-time energy source (100) is used to supply power to the electrical equipment through a frequency converter (105); It also includes a double-pole switch (101), a diode five (130), a diode six (1401), a diode seven (141), and a diode eight (1411); the positive electrode of the protection resistor two (104) is electrically connected to the negative electrode of the diode six (1401); the positive electrode of the diode seven (141) is electrically connected to the negative electrode of the diode eight (1411); the positive electrode of the diode five (130) is electrically connected to the positive electrode of the diode seven (141); and the negative electrode of the diode six (1401) is electrically connected to the negative electrode of the diode eight (1411); One connector of the double-pole switch (101) is electrically connected to the live wire C, and the other connector is electrically connected to the negative electrode of the diode five (130) through the protective resistor one (102); Another connector of the double-pole switch (101) is electrically connected to the neutral line N, and another connector thereof is electrically connected to the positive electrode of the diode eight (1411); The cathode of the diode eight (1411) is electrically connected to the inductor (142), and the inverter two (103) is electrically connected between the inductor (142) and the anode of the diode seven (141); The positive electrode of the short-time energy source (100) is electrically connected to the positive electrode of the diode seven (141), the positive electrode of the short-time energy source (100) is also electrically connected to the positive electrode of the inverter one (105) through the protection resistor two (104), and the negative electrode of the short-time energy source (100) is electrically connected to the negative electrode of the inverter one (105) through the diode ten (144); A protection capacitor (106) is electrically connected between the cathode of the diode ten (144) and the protection resistor two (104); The cathode of the diode ten (144) is electrically connected to the cathodes of the diode two (111), the diode four (121) and the diode six (1401); the protection resistor two (104) is electrically connected to the anodes of the diode one (110), the diode three (120) and the diode five (130); the cathode of the diode one (110) is electrically connected to the anode of the diode two (111); the cathode of the diode three (120) is electrically connected to the anode of the diode four (121); the cathode of the diode five (130) is electrically connected to the anode of the diode six (1401); The positive electrode of the diode 2 (111) is electrically connected to the live wire A of the mains, the positive electrode of the diode 4 (121) is electrically connected to the live wire B of the mains, and the positive electrode of the diode 6 (1401) is electrically connected to the live wire C of the mains.

2. A short-time energy source system for a DC power supply line according to claim 1, characterized in that: The short-time energy sources (100) are provided with at least two.

3. A short-time energy source system for a DC power supply line according to claim 2, characterized in that: The short-time energy source (100) is an energy storage capacitor.

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