Novel power saving system

Abstract

The invention discloses a novel power saving system, which relates to the technical field of power saving, and is characterized by comprising a special multi-winding transformer T1, power electronic equipment and a capacitor, the special multi-winding transformer T1 is electrically connected with the power electronic equipment and the capacitor; the specially-made multi-winding transformer T1 comprises two windings; the secondary side of one winding is electrically connected with the power electronic equipment, provides a channel for the control voltage and is used for controlling the output voltage; and the other winding is electrically connected with the capacitor to provide a channel for controlling the impedance network to form the impedance network to be connected with the load in parallel. The technical problem to be solved by the invention is to provide a novel power-saving system, which combines an electromagnetic balance principle and a power electronic technology, realizes the function of simultaneously controlling output voltage and load impedance network balance in real time through a specially-made multi-winding transformer, further improves the energy-saving space, and also solves the problem of power interference of a power supply at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of power saving, and more specifically, to a novel power saving system. Background Art

[0002] The origin of the power saver technology can be traced back several decades. With the continuous growth of energy demand and the strengthening of energy conservation and emission reduction awareness, the power saver technology has developed rapidly. From the initial capacitance compensation technology to thyristor chopping technology, and then to frequency conversion technology, surge suppression technology, and electromagnetic conversion and compensation technology, the power saver technology has undergone several updates, with increasingly obvious power saving effects and less harm to the power grid and equipment.

[0003] A power saver is a device that reduces the electric energy consumed by electrical equipment during use through technical means, thereby improving energy utilization efficiency. Its working principle is mainly based on knowledge in multiple fields such as power electronics technology, control technology, and materials science. A power saver can adjust the working state of electrical equipment to make it operate in a more energy-efficient mode; it can also optimize the operating parameters of electrical equipment, such as adjusting voltage, current, etc., so as to achieve lower energy consumption under the premise of meeting the usage requirements. In addition, a power saver can also reduce the standby energy consumption of electrical equipment by cutting off the standby power supply and reducing the standby power consumption.

[0004] The electromagnetic power saving technology mainly uses the principle of electromagnetic balance, and by using the principles of electromagnetic balance and electromagnetic voltage regulation, according to the load change situation and the actual parameters of the current power supply, it intelligently regulates the actual output power to achieve complete matching, and can also timely transfer the excess energy to the power supply, improve the power factor, greatly reduce the losses on the transmission line, effectively improve the power utilization efficiency, increase the system capacity, improve the voltage fluctuation situation, reduce the ineffective losses of electrical equipment itself, extend the service life of the equipment, and ultimately achieve the comprehensive power saving of the system and realize the benefits of high-efficiency power saving.

[0005] The current electromagnetic balance type power saver cannot control the output voltage in real time. For motor-type loads, there is still room for power saving. And for problems such as power sags in the power supply, it cannot provide effective support. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a novel power saving system, which combines the principle of electromagnetic balance and power electronics technology, and through a specially designed multi-winding transformer, realizes the functions of simultaneously controlling the output voltage and balancing the load impedance network in real time, further improving the energy saving space, and at the same time achieving the treatment of power sags in the power supply.

[0007] The present invention adopts the following technical solutions to achieve the invention purpose:

[0008] A novel power-saving system, characterized in that it includes: a special multi-winding transformer T1, power electronic equipment and capacitors; the special multi-winding transformer T1 is electrically connected to the power electronic equipment and the capacitors; the special multi-winding transformer T1 includes two windings; the secondary side of one winding is electrically connected to the power electronic equipment to provide a channel for controlling the voltage and is used to control the output voltage; the other winding is electrically connected to the capacitors to provide a channel for controlling the impedance network, form an impedance network, and is connected in parallel with the load to control the three-phase current balance and compensate for reactive power.

[0009] As a further limitation of this technical solution, one winding is winding T11, the terminal 1 of winding T11 is electrically connected to the terminal A' of the power electronic equipment, the terminal 2 of winding T11 is electrically connected to the terminal A1' of the power electronic equipment, the terminal 5 of winding T11 is electrically connected to the terminal B' of the power electronic equipment, the terminal 6 of winding T11 is electrically connected to the terminal B1' of the power electronic equipment, the terminal 9 of winding T11 is electrically connected to the terminal C' of the power electronic equipment, the terminal 10 of winding T11 is electrically connected to the terminal C1' of the power electronic equipment, the other winding is winding T12, the terminals 1, 2 and 3 of winding T12 are respectively electrically connected to the capacitors, the terminal 3 of winding T11 is electrically connected to the terminal A of the power grid, the terminal 4 of winding T11 and the terminal 4 of winding T12 are respectively electrically connected to the terminal A1 of the factory power distribution cabinet, the terminal 7 of winding T11 is electrically connected to the terminal B of the power grid, the terminal 8 of winding T11 and the terminal 5 of winding T12 are respectively electrically connected to the terminal B1 of the factory power distribution cabinet, the terminal 11 of winding T11 is electrically connected to the terminal C of the power grid, the terminal 12 of winding T11 and the terminal 6 of winding T12 are respectively electrically connected to the terminal C1 of the factory power distribution cabinet.

[0010] As a further limitation of this technical solution, the power electronic equipment is a voltage source type power electronic device.

[0011] As a further limitation of the present technical solution, the terminal A of the power electronic device is electrically connected to one end of the inductor L1, the other end of the inductor L1 is electrically connected to one ends of the switches S1, S2, diodes D1 and D2, the terminal B of the power electronic device is electrically connected to one end of the inductor L2, the other end of the inductor L2 is electrically connected to one ends of the switches S3, S4, diodes D3 and D4, the terminal C of the power electronic device is electrically connected to one end of the inductor L3, the other end of the inductor L3 is electrically connected to one ends of the switches S5, S6, diodes D5 and D6, the terminal A' of the power electronic device is electrically connected to one end of the inductor L4, the other end of the inductor L4 is electrically connected to one ends of the switches S7, S8, diodes D7 and D8, the terminal B' of the power electronic device is electrically connected to one end of the inductor L5, the other end of the inductor L5 is electrically connected to one ends of the switches S9, S10, diodes D9 and D10, the terminal C' of the power electronic device is electrically connected to one end of the inductor L6, the other end of the inductor L6 is electrically connected to one ends of the switches S11, S12, diodes D11 and D12, the terminals A1', B1' and C1' of the power electronic device are respectively electrically connected to one end of the inductor L7, the other end of the inductor L7 is electrically connected to one ends of the switches S13, S14, diodes D13 and D14, one ends of the switches S1, S3, S5, S7, S9, S11, S13, diodes D1, D3, D5, D7, D9, D11 and D13 are respectively electrically connected to one end of the capacitor C, and one ends of the switches S2, S4, S6, S8, S10, S12, S14, diodes D2, D4, D6, D8, D10, D12 and D14 are respectively electrically connected to the other end of the capacitor C.

[0012] As a further limitation of the present technical solution, the terminal 1 of the winding T12 is electrically connected to one ends of the capacitors C1 and C3, the terminal 2 of the winding T12 is electrically connected to one end of the capacitor C2 and the other end of the capacitor C1, and the terminal 3 of the winding T12 is electrically connected to the other ends of the capacitors C2 and C3.

[0013] As a further limitation of the present technical solution, it further includes a bypass switch S, the terminals A, B and C of the power grid are respectively electrically connected to the bypass switch S, and the terminals A1, B1 and C1 of the factory power distribution cabinet are respectively electrically connected to the bypass switch S.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are:

[0015] The beneficial effects of the present invention are that it can enable motor-type loads to achieve optimal energy efficiency, effectively suppress the problem of power supply voltage sags, and can also effectively suppress the problem of current imbalance. Using the power-saving technology proposed by the present invention can further improve the power-saving effect and further contribute to a green and low-carbon society. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the circuit schematic diagram of the present invention.

[0017] Figure 2 is the circuit schematic diagram of the power electronic device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following will combine with the drawings to describe in detail a specific embodiment of the present invention. However, it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0019] The present invention includes: a special multi-winding transformer T1, a power electronic device, and a capacitor; the special multi-winding transformer T1 is electrically connected to the power electronic device and the capacitor; the special multi-winding transformer T1 includes two windings; the secondary side of one winding is electrically connected to the power electronic device to provide a channel for controlling the voltage and is used to control the output voltage; the other winding is electrically connected to the capacitor to provide a channel for controlling the impedance network, form an impedance network, and is connected in parallel with the load to control the three-phase current balance and compensate for reactive power.

[0020] One winding is winding T11. Terminal 1 of winding T11 is electrically connected to terminal A’ of the power electronic device. Terminal 2 of winding T11 is electrically connected to terminal A1’ of the power electronic device. Terminal 5 of winding T11 is electrically connected to terminal B’ of the power electronic device. Terminal 6 of winding T11 is electrically connected to terminal B1’ of the power electronic device. Terminal 9 of winding T11 is electrically connected to terminal C’ of the power electronic device. Terminal 10 of winding T11 is electrically connected to terminal C1’ of the power electronic device. The other winding is winding T12. Terminals 1, 2 and 3 of winding T12 are respectively electrically connected to capacitors. Terminal 3 of winding T11 is electrically connected to terminal A of the power grid. Terminal 4 of winding T11 and terminal 4 of winding T12 are respectively electrically connected to terminal A1 of the factory power distribution cabinet. Terminal 7 of winding T11 is electrically connected to terminal B of the power grid. Terminal 8 of winding T11 and terminal 5 of winding T12 are respectively electrically connected to terminal B1 of the factory power distribution cabinet. Terminal 11 of winding T11 is electrically connected to terminal C of the power grid. Terminal 12 of winding T11 and terminal 6 of winding T12 are respectively electrically connected to terminal C1 of the factory power distribution cabinet.

[0021] 7. The novel power saving system according to claim 2, characterized in that: the power electronic device is a voltage source type power electronic device.

[0022] The voltage source type power electronic device controls the output voltage and includes IGBT or silicon carbide power devices, an intelligent control system, a heat dissipation system, etc. It can automatically control the output voltage in real time to be a constant voltage that is not affected by the input voltage, so that the motor-type load can achieve the highest energy efficiency. At the same time, it provides voltage support for the power supply voltage sag of the power supply.

[0023] The terminal A of the power electronic device is electrically connected to one end of the inductor L1. The other end of the inductor L1 is electrically connected to one ends of the switch S1, the switch S2, the diode D1 and the diode D2. The terminal B of the power electronic device is electrically connected to one end of the inductor L2. The other end of the inductor L2 is electrically connected to one ends of the switch S3, the switch S4, the diode D3 and the diode D4. The terminal C of the power electronic device is electrically connected to one end of the inductor L3. The other end of the inductor L3 is electrically connected to one ends of the switch S5, the switch S6, the diode D5 and the diode D6. The terminal A' of the power electronic device is electrically connected to one end of the inductor L4. The other end of the inductor L4 is electrically connected to one ends of the switch S7, the switch S8, the diode D7 and the diode D8. The terminal B' of the power electronic device is electrically connected to one end of the inductor L5. The other end of the inductor L5 is electrically connected to one ends of the switch S9, the switch S10, the diode D9 and the diode D10. The terminal C' of the power electronic device is electrically connected to one end of the inductor L6. The other end of the inductor L6 is electrically connected to one ends of the switch S11, the switch S12, the diode D11 and the diode D12. The terminals A1', B1' and C1' of the power electronic device are respectively electrically connected to one end of the inductor L7. The other end of the inductor L7 is electrically connected to one ends of the switch S13, the switch S14, the diode D13 and the diode D14. The switches S1, S3, S5, S7, S9, S11, S13, the diodes D1, D3, D5, D7, D9, D11 and D13 are respectively electrically connected to one end of the capacitor C. The switches S2, S4, S6, S8, S10, S12, S14, the diodes D2, D4, D6, D8, D10, D12 and D14 are respectively electrically connected to the other end of the capacitor C.

[0024] The terminal 1 of the winding T12 is electrically connected to one ends of the capacitor C1 and the capacitor C3. The terminal 2 of the winding T12 is electrically connected to one end of the capacitor C2 and the other end of the capacitor C1. The terminal 3 of the winding T12 is electrically connected to the other ends of the capacitor C2 and the capacitor C3.

[0025] It further includes a bypass switch S. The terminals A, B and C of the power grid are respectively electrically connected to the bypass switch S. The terminals A1, B1 and C1 of the factory power distribution cabinet are respectively electrically connected to the bypass switch S. Specific embodiments:

[0027] Taking the transformer capacity of 1000 kVA and the control output voltage fluctuation range of ±10% as the preconditions, the specific implementation manners of the present invention will be described.

[0028] First, design a 4-winding transformer. The first group of windings (transformers T11, T12, and T13) serves as a voltage control loop and is connected in series to the main circuit. The designed turns ratio of the primary to secondary is 1:10. The designed value of the primary current is 1800 A, the designed value of the secondary current is 180 A, and the rated secondary voltage is 400 V. The second group of windings (transformer T14) serves as an impedance network loop and is connected in parallel to the main circuit. It adopts the Yd type, with a designed current of 100 A, a turns ratio of 1:1, 3 taps on the primary side, and the taps are designed as 100%, 95%, and 90%. The designed equivalent leakage inductance of the secondary side is 100 μH.

[0029] Design a back-to-back (ACDC-DCAC) voltage source type power electronic device. The designed capacity is 200 kW. Select IGBT as the power device. The input rated voltage is 380 V, and the output rated voltage is 400 V. The power electronic device can automatically control the output voltage to be a stable 380 V three-phase balanced voltage. The front-end ACDC is connected to the power grid through three terminals A, B, and C, and the back-end DCAC is connected to the secondary side of the first winding of the multi-winding transformer through six terminals A', B', C', A1', B1', and C1'. When the grid voltage is higher than 380 V, the amplitude of the output voltage of the back-end DCAC is the grid voltage minus 380, and the phase is opposite to that of the grid. The front-end ACDC outputs active power to the power grid, reducing the voltage on the load side to 380 V. When the grid voltage is lower than 380 V, the amplitude of the output voltage of the back-end DCAC is 380 minus the grid voltage, and the phase is the same as that of the grid. The front-end ACDC draws active power from the power grid, controlling the voltage on the load side at 380 V. The ACDC-DCAC voltage source type power electronic device can also adopt a 4-arm structure to independently control the output voltage of each phase, thus achieving three-phase balance and stable amplitude of the three-phase voltage.

[0030] Design an impedance network, select 157.2 μF, with a reactive power compensation capacity of 10 kVA.

[0031] Select a contactor with a rated current of 1300 A as the bypass switch.

[0032] The new energy-saving device designed by the present invention is connected to the power grid at the front end, connected in series to the main circuit, and connected to the factory low-voltage power distribution cabinet at the back end. By detecting the input voltage, output voltage, and input current, and using power electronic technology, it automatically adjusts the output voltage to a stable and balanced 380 V voltage, automatically selects the taps of the second winding transformer, and automatically compensates for unbalanced current and reactive current, improving the current quality.

[0033] The specific embodiments of the present invention disclosed above are only for illustration. However, the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A new type of power-saving system, characterized in that, Including: A specially designed multi-winding transformer T1, a power electronic device, and a capacitor; The specially designed multi-winding transformer T1 is electrically connected to the power electronic device and the capacitor; The specially designed multi-winding transformer T1 includes two windings; The secondary side of one winding is electrically connected to the power electronic device, providing a channel for the control voltage to control the output voltage; The other winding is electrically connected to the capacitor, providing a channel for the control impedance network, forming an impedance network, connected in parallel with the load, and used to control the three-phase current balance and compensate for reactive power.

2. The novel power-saving system according to claim 1, characterized in that: One winding is winding T11. The terminal 1 of winding T11 is electrically connected to terminal A' of the power electronic device, the terminal 2 of winding T11 is electrically connected to terminal A1' of the power electronic device, the terminal 5 of winding T11 is electrically connected to terminal B' of the power electronic device, the terminal 6 of winding T11 is electrically connected to terminal B1' of the power electronic device, the terminal 9 of winding T11 is electrically connected to terminal C' of the power electronic device, the terminal 10 of winding T11 is electrically connected to terminal C1' of the power electronic device. The other winding is winding T12. The terminals 1, 2, and 3 of winding T12 are respectively electrically connected to the capacitor. The terminal 3 of winding T11 is electrically connected to terminal A of the power grid. The terminal 4 of winding T11 and the terminal 4 of winding T12 are respectively electrically connected to terminal A1 of the factory power distribution cabinet. The terminal 7 of winding T11 is electrically connected to terminal B of the power grid. The terminal 8 of winding T11 and the terminal 5 of winding T12 are respectively electrically connected to terminal B1 of the factory power distribution cabinet. The terminal 11 of winding T11 is electrically connected to terminal C of the power grid. The terminal 12 of winding T11 and the terminal 6 of winding T12 are respectively electrically connected to terminal C1 of the factory power distribution cabinet.

3. The novel power-saving system according to claim 2, characterized in that: The power electronic device is a voltage source type power electronic device.

4. The novel power-saving system according to claim 2 or 3, characterized in that: The terminal A of the power electronic device is electrically connected to one end of the inductor L1. The other end of the inductor L1 is electrically connected to one ends of the switch S1, switch S2, diode D1 and diode D2. The terminal B of the power electronic device is electrically connected to one end of the inductor L2. The other end of the inductor L2 is electrically connected to one ends of the switch S3, switch S4, diode D3 and diode D4. The terminal C of the power electronic device is electrically connected to one end of the inductor L3. The other end of the inductor L3 is electrically connected to one ends of the switch S5, switch S6, diode D5 and diode D6. The terminal A' of the power electronic device is electrically connected to one end of the inductor L4. The other end of the inductor L4 is electrically connected to one ends of the switch S7, switch S8, diode D7 and diode D8. The terminal B' of the power electronic device is electrically connected to one end of the inductor L5. The other end of the inductor L5 is electrically connected to one ends of the switch S9, switch S10, diode D9 and diode D10. The terminal C' of the power electronic device is electrically connected to one end of the inductor L6. The other end of the inductor L6 is electrically connected to one ends of the switch S11, switch S12, diode D11 and diode D12. The terminals A1', B1' and C1' of the power electronic device are respectively electrically connected to one end of the inductor L7. The other end of the inductor L7 is electrically connected to one ends of the switch S13, switch S14, diode D13 and diode D14. The switch S1, switch S3, switch S5, switch S7, switch S9, switch S11, switch S13, diode D1, diode D3, diode D5, diode D7, diode D9, diode D11 and diode D13 are respectively electrically connected to one end of the capacitor C. The switch S2, switch S4, switch S6, switch S8, switch S10, switch S12, switch S14, diode D2, diode D4, diode D6, diode D8, diode D10, diode D12 and diode D14 are respectively electrically connected to the other end of the capacitor C.

5. The novel power-saving system according to claim 2, characterized in that: The terminal 1 of the winding T12 is electrically connected to one ends of the capacitor C1 and capacitor C3. The terminal 2 of the winding T12 is electrically connected to one end of the capacitor C2 and the other end of the capacitor C1. The terminal 3 of the winding T12 is electrically connected to the other ends of the capacitor C2 and the capacitor C3.

6. The novel power-saving system according to claim 1, wherein: It further includes a bypass switch S. The terminals A, B and C of the power grid are respectively electrically connected to the bypass switch S. The terminals A1, B1 and C1 of the factory power distribution cabinet are respectively electrically connected to the bypass switch S.

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