High-voltage phase-shifting transformer device capable of realizing uninterrupted power supply

Abstract

The high-voltage phase-shifting transformer device comprises a phase-shifting transformer and a high-voltage frequency converter, a primary side 6kV / 10kV winding of the phase-shifting transformer is connected with a power grid, a secondary side phase-shifting multi-winding of the phase-shifting transformer is connected with an input end of the high-voltage frequency converter, and an output end of the high-voltage frequency converter is connected with a motor load; the system is characterized in that a secondary side 690V non-phase-shifting winding of the phase-shifting transformer is connected with an energy storage converter; and when the power grid is abnormal, the energy storage converter supplies power to the motor load at the rear stage of the secondary side phase-shift multi-winding through the secondary side 690V non-phase-shift winding. According to the high-voltage phase-shifting transformer device capable of realizing uninterruptible power supply, when a power grid is abnormal, the energy storage converter provides energy for the motor load at the rear stage of the secondary side phase-shifting multi-winding through the secondary side 690V non-phase-shifting winding, so that the high-voltage phase-shifting transformer device can realize uninterruptible power supply, and the operation reliability of the motor load is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power electronics technical field, more specifically, especially relate to a kind of high-voltage phase-shift transformer device of uninterrupted power supply. BACKGROUND

[0002] High-voltage frequency conversion technology can control the operation of alternating current motor by changing the frequency of load motor power supply, and can realize soft start, energy saving, motor and load equipment protection and many other functions. As a key device of high-voltage frequency converter, one of the effective methods for phase-shift transformer to suppress harmonics is to phase-shift the high-voltage side of rectifier transformer. This method can basically eliminate low-order harmonics with large amplitude.

[0003] The phase-shift transformer used in ordinary high-voltage frequency converter provides energy for subsequent cascaded units through power grid. If the power grid is abnormal, the primary side of the phase-shift transformer will lose power, and the high-voltage frequency converter unit cannot be powered, which leads to the failure of the controlled motor load to operate normally, and even shutdown. The power grid abnormality will have a great impact on most important types of loads such as fans and power supplies, which will cause irreparable loss. SUMMARY

[0004] The utility model discloses in order to overcome the shortcoming of above-mentioned technical problem, provide a kind of high-voltage phase-shift transformer device of uninterrupted power supply.

[0005] The high-voltage phase-shift transformer device of uninterrupted power supply of the utility model, including phase-shift transformer and high-voltage frequency converter, the primary side of phase-shift transformer, secondary side is respectively primary side 6kV / 10kV winding and secondary side phase-shift multi-winding, the primary side 6kV / 10kV winding of phase-shift transformer is connected with power grid, and the secondary side phase-shift multi-winding of phase-shift transformer is connected with the input end of high-voltage frequency converter, and the output end of high-voltage frequency converter is connected with motor load;AC power input by power grid is input to high-voltage frequency converter after the transformation and phase-shift of phase-shift transformer, and high-voltage frequency converter is frequency conversion to control motor load variable frequency operation to the input AC power;Its characterized in that: the secondary side 690V non-phase-shift winding of phase-shift transformer is provided with secondary side, and the secondary side 690V non-phase-shift winding of phase-shift transformer is connected with energy storage converter;When power grid is abnormal: energy storage converter supplies power to motor load of the rear stage of secondary side phase-shift multi-winding through secondary side 690V non-phase-shift winding.

[0006] The utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, and the utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, when the power grid is normal: the power grid is powered for high -tension frequency changer through the secondary side phase -shift multi -winding group of phase -shift transformer, to make high -tension frequency changer control motor class load's variable frequency operation, and the power grid provides the energy of charging time for energy storage converter through the secondary side 690V non -phase -shift winding group of phase -shift transformer, simultaneously, energy storage converter releases energy to the power grid through the secondary side 690V non -phase -shift winding group.

[0007] The utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, and the utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, when the power grid is normal: the power grid is powered for high -tension frequency changer through the secondary side phase -shift multi -winding group of phase -shift transformer, to make high -tension frequency changer control motor class load's variable frequency operation, and the power grid provides the energy of charging time for energy storage converter through the secondary side 690V non -phase -shift winding group of phase -shift transformer, simultaneously, energy storage converter releases energy to the power grid through the secondary side 690V non -phase -shift winding group.

[0008] The utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, and the utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, when the power grid is normal: the power grid is powered for high -tension frequency changer through the secondary side phase -shift multi -winding group of phase -shift transformer, to make high -tension frequency changer control motor class load's variable frequency operation, and the power grid provides the energy of charging time for energy storage converter through the secondary side 690V non -phase -shift winding group of phase -shift transformer, simultaneously, energy storage converter releases energy to the power grid through the secondary side 690V non -phase -shift winding group.

[0009] The utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, and the utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, when the power grid is normal: the power grid is powered for high -tension frequency changer through the secondary side phase -shift multi -winding group of phase -shift transformer, to make high -tension frequency changer control motor class load's variable frequency operation, and the power grid provides the energy of charging time for energy storage converter through the secondary side 690V non -phase -shift winding group of phase -shift transformer, simultaneously, energy storage converter releases energy to the power grid through the secondary side 690V non -phase -shift winding group.

[0010] The utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, and the utility model discloses a high -tension phase -shift transformer device of realization uninterrupted power supply, when the power grid is normal: the power grid is powered for high -tension frequency changer through the secondary side phase -shift multi -winding group of phase -shift transformer, to make high -tension frequency changer control motor class load's variable frequency operation, and the power grid provides the energy of charging time for energy storage converter through the secondary side 690V non -phase -shift winding group of phase -shift transformer, simultaneously, energy storage converter releases energy to the power grid through the secondary side 690V non -phase -shift winding group. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the circuit schematic diagram of the utility model's realization uninterrupted power supply's high -tension phase -shift transformer device.

[0012] In the drawing: 1 phase -shift transformer, 2 high -tension frequency changer, 3 energy storage converter. DETAILED DESCRIPTION

[0013] The utility model will be further explained below in connection with the drawings and examples.

[0014] AsFigure 1 As shown, the circuit principle diagram of the high-voltage phase-shifting transformer device for realizing uninterrupted power supply is shown, which is composed of a phase-shifting transformer 1, a high-voltage frequency converter 2 and an energy storage converter 3, the primary side of the phase-shifting transformer 1 is a primary side 6kV / 10kV winding, the secondary side of the phase-shifting transformer 1 is provided with a secondary side phase-shifting multi-winding and a secondary side 690V winding, the primary side 6kV / 10kV winding of the phase-shifting transformer 1 is connected with a power grid, the secondary side phase-shifting multi-winding of the phase-shifting transformer 1 is connected with the input end of the high-voltage frequency converter 2, and the secondary side 690V winding of the phase-shifting transformer 1 is connected with the energy storage converter 3. The output end of the high-voltage frequency converter 2 is connected with a motor load, and the high-voltage frequency converter 2 converts the alternating current input by the secondary side phase-shifting multi-winding into a frequency-controllable alternating current after rectification and inversion, so as to drive the motor load to run in frequency conversion mode.

[0015] The phase-shifting transformer 1 performs phase-shifting transformation on the 6kV or 10kV high-voltage alternating current input by the power grid, so as to eliminate low-order harmonics with large amplitude, and the alternating current is input to the high-voltage frequency converter 2 through the secondary side phase-shifting winding. The high-voltage frequency converter 2 controls the frequency conversion operation of the motor load by using the alternating current provided by the secondary side phase-shifting winding of the phase-shifting transformer 1. At the same time, the power grid provides energy for the energy storage converter 3 during charging through the secondary side 690V non-phase-shifting winding of the phase-shifting transformer 1, and the energy storage converter 3 can also release energy to the power grid through the secondary side 690V non-phase-shifting winding and the primary side 6kV / 10kV winding at the same time.

[0016] When the power grid is abnormal, the primary side 6kV / 10kV winding of the phase-shifting transformer 1 is disconnected from the power grid. At this time, the secondary side 690V winding of the phase-shifting transformer 1 is equivalent to a primary winding, and the secondary side phase-shifting multi-winding of the phase-shifting transformer 1 outputs alternating current to the high-voltage frequency converter 2 through electromagnetic induction with the secondary side phase-shifting multi-winding of the phase-shifting transformer 1, so that the high-voltage frequency converter 2 can still control the uninterrupted operation of the motor load when the power grid is abnormal, and uninterrupted power supply of important loads such as fans and motors during power grid abnormality is realized, so as to avoid the occurrence of immeasurable loss caused by power grid abnormality.

[0017] The secondary side phase-shifting multi-winding of the phase-shifting transformer 1 adopts a side-extended triangle connection method. Since the side-extended triangle connection method is adopted, the secondary side phase-shifting multi-winding of the phase-shifting transformer 1 can further eliminate low-order harmonics with large amplitude while providing energy for the high-voltage frequency converter 2.

[0018] The energy storage converter 3 and the high-voltage frequency converter 2 are connected through a communication line, so that the energy storage converter 3 and the high-voltage frequency converter 2 can exchange signals with each other to complete power switching during power grid abnormality. The primary side 6kV / 10kV winding of the phase-shifting transformer 1 is connected with the power grid through a high-voltage switch cabinet, and the on-off connection of the phase-shifting transformer 1 and the power grid is realized by controlling the on-off of the high-voltage switch cabinet.

[0019] In summary, the primary side 6kV / 10kV winding of the phase-shifting transformer 1 can control the frequency conversion operation of the motor load behind through the secondary side phase-shifting multi-winding under normal grid, can provide energy for the charging of the energy storage converter 3 through the secondary side 690V non-phase-shifting winding, and can also simultaneously realize the function of releasing energy from the energy storage converter 3 to the grid. When the grid is abnormal, the energy storage converter 3 provides energy for the motor load behind the secondary side phase-shifting multi-winding through the secondary side 690V non-phase-shifting winding, so that the high-voltage phase-shifting transformer device can be uninterruptedly powered, and the reliability of the motor load operation is ensured.

Claims

1. A high-voltage phase-shifting transformer device for realizing uninterrupted power supply, comprising a phase-shifting transformer (1) and a high-voltage frequency converter (2), the primary side and the secondary side of the phase-shifting transformer being a primary side 6kV / 10kV winding and a secondary side phase-shifting multi-winding respectively, the primary side 6kV / 10kV winding of the phase-shifting transformer being connected with a power grid, the secondary side phase-shifting multi-winding of the phase-shifting transformer being connected with an input end of the high-voltage frequency converter, and an output end of the high-voltage frequency converter being connected with a motor load; AC power input from the power grid is input to the high-voltage frequency converter after being transformed and phase-shifted by the phase-shifting transformer, and the high-voltage frequency converter performs frequency conversion on the input AC power to control the motor load to run in frequency conversion mode; characterized in that: The secondary side of the phase-shifting transformer is provided with a secondary side 690V non-phase-shifting winding, and the secondary side 690V non-phase-shifting winding of the phase-shifting transformer is connected with an energy storage converter (3); when the power grid is abnormal: the energy storage converter supplies power to the motor load of the secondary side phase-shifting multi-winding of the phase-shifting transformer through the secondary side 690V non-phase-shifting winding.

2. The high-voltage phase-shift transformer arrangement enabling uninterrupted power supply according to claim 1, characterized in that When the power grid is normal: the power grid supplies power to the high-voltage frequency converter (2) through the secondary side phase-shifting multi-winding of the phase-shifting transformer (1), so that the high-voltage frequency converter controls the frequency conversion operation of the motor load, and the power grid supplies energy to the energy storage converter through the secondary side 690V non-phase-shifting winding of the phase-shifting transformer during charging, and at the same time, the energy storage converter releases energy to the power grid through the secondary side 690V non-phase-shifting winding.

3. The high-voltage phase-shift transformer arrangement enabling uninterrupted power supply according to claim 1 or 2, characterized in that: The secondary side phase-shifting multi-winding of the phase-shifting transformer (1) adopts a delay edge triangle connection method which can eliminate low-order harmonics with large amplitude.

4. The high-voltage phase-shift transformer arrangement enabling uninterrupted power supply according to claim 1 or 2, characterized in that: The primary side 6kV / 10kV winding of the phase-shifting transformer (1) is connected with the power grid through a high-voltage switch cabinet.

5. The high-voltage phase-shift transformer arrangement enabling uninterrupted power supply according to claim 1 or 2, characterized in that The energy storage converter (3) and the high-voltage frequency converter (2) are connected through a communication line.

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