High efficiency, low harmonic, bidirectional elevator energy recovery converter with self-stabilizing function

Abstract

The present invention discloses a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function, which belongs to the field of power electronics technology. The main circuit of the bidirectional elevator energy recovery converter of the present invention includes a voltage stabilizing circuit, a bidirectional elevator energy recovery converter circuit and an AC side midpoint generating circuit; the voltage stabilizing circuit can ensure the voltage balance of the DC bus capacitor, so that the converter has a self-stabilizing function; the bidirectional elevator energy recovery converter circuit is used for electric energy recovery of the elevator system, and can recover the regenerative energy generated by the motor and feed it back to the power grid or storage device during the elevator up and down process; the elevator energy recovery converter proposed by the present invention can realize the bidirectional flow of energy and achieve the purpose of energy saving; and it adopts a multi-level topology, with a large number of output voltage levels, which can effectively reduce the output current harmonics and effectively reduce the impact on the power grid.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-voltage stabilization function. Background Art

[0002] The elevator energy recovery converter is an important part of the elevator control system, which can realize the conversion between AC and DC. On the one hand, during the elevator's ascending stage, it needs to absorb energy from the power grid, convert electrical energy into mechanical energy, and provide power for the elevator operation; on the other hand, during the elevator's descending stage, mechanical energy is converted into electrical energy and released to the power grid to achieve energy saving. Due to the unidirectional conductivity of the diode, it is impossible to achieve bidirectional energy flow, so it is not suitable as an elevator energy recovery converter for bidirectional energy flow.

[0003] However, the device voltage stress of the traditional two-level converter is large, and the output current harmonic content is large. The converter topology should be improved to increase the number of output voltage levels and reduce the output current harmonics. However, the DC bus of the traditional multi-level converter has series capacitors, which easily causes the problem of unbalanced capacitor voltage distribution. Effective measures need to be taken for voltage balancing, otherwise the output current harmonics will increase and even cause instability of the elevator energy recovery converter system.

[0004] After years of development and application, traditional silicon power switching devices are very mature in technology, but their performance is close to the physical limit, and their switching loss and conduction loss are large, resulting in low efficiency of elevator energy recovery converters. In summary, it is urgent to propose an elevator energy recovery converter that can achieve bidirectional energy flow, low current harmonics, and high efficiency. Summary of the invention

[0005] The object of the present invention is to provide a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function to solve the problems raised in the above-mentioned background technology.

[0006] The main circuit of the bidirectional elevator energy recovery converter includes a voltage stabilizing circuit, a bidirectional elevator energy recovery converter circuit and an AC side midpoint generating circuit;

[0007] The voltage stabilizing circuit can ensure the balance of the DC bus capacitor voltage, so that the converter has a self-stabilizing function;

[0008] The bidirectional elevator energy recovery converter circuit is used for electric energy recovery in the elevator system, and can recover the regenerative energy generated by the motor and feed it back to the power grid or storage device during the elevator's upward and downward movement;

[0009] The AC side midpoint generating circuit is used for midpoint potential balance control of the bidirectional converter; the circuit provides a stable midpoint potential to achieve symmetrical positive and negative DC bus voltages and balance the load;

[0010] The resistor in the voltage stabilizing circuit One end of the bidirectional elevator energy recovery converter circuit is connected to the silicon carbide power switch device One end of the voltage stabilizing circuit is connected to The other end is connected to the silicon carbide Schottky diode in the bidirectional elevator energy recovery converter circuit The isolation inductor in the bidirectional elevator energy recovery converter circuit is connected to the anode of the and One end of the series resistor , single-phase power grid and filter inductor The capacitor that creates the AC neutral point in the AC side midpoint generating circuit and connected.

[0011] The voltage stabilizing circuit includes a voltage stabilizing circuit input voltage , Silicon carbide power switching devices that constitute the voltage stabilization circuit ,diode ,inductance , The driving pulse signal , voltage stabilization circuit filter capacitor and resistor ;

[0012] The voltage regulator circuit input voltage The positive electrode and the The drain is connected to the Source and cathode of diode and inductance One end is connected; for The driving pulse signal is used to control Opening and shutting down; and In parallel with the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected in parallel with the DC bus capacitor Both sides.

[0013] The bidirectional elevator energy recovery converter circuit includes a DC bus total voltage , DC bus capacitor , and , Silicon Carbide Power Switching Devices , , , , and , Silicon Carbide Schottky Diode , , , , and ,resistance and isolation inductor , , , , and ;

[0014] The total DC bus voltage Connect the DC bus capacitors in series from top to bottom , and ; Drain and Positive terminal and The cathode end is connected, Source and , , as well as The cathode terminal is connected to ; Drain and The cathode end is connected, Source and Negative terminal connected; Drain and The cathode end is connected, Source and One end is connected; Drain and Negative terminal connected, Source and The cathode end is connected; Source and One end is connected, Drain and The cathode end is connected; Drain and One end is connected, Source and Negative terminal connected; Anode terminal and , and connected; Anode terminal and One end is connected; Anode terminal and The anode ends are connected; Anode terminal and One end is connected; Anode terminal and Negative terminal connected; Anode terminal and DC bus capacitor Negative terminal connected; and and Connected, intersecting at a point ; , and Connected, intersecting at a point ; and The other end is connected, and connected in series from left to right , and .

[0015] The AC side midpoint generating circuit includes a capacitor for generating an AC neutral point. and and resistor and ;

[0016] The capacitor Positive terminal and The cathode end is connected, Negative terminal and The other end is connected; and Connect in parallel and Both sides.

[0017] The single modulation wave generation module is used to limit and select the signal to obtain a single modulation wave ;

[0018] The single modulation wave splitting module is used to split a single modulation wave signal into multiple component signals;

[0019] The pulse generation module is used to generate a driving pulse signal;

[0020] The single carrier modulation is a basic digital modulation technique, in which the transmitted data is modulated onto a single carrier frequency; the single carrier modulation occupies only one frequency band in the frequency domain.

[0021] The single carrier modulation is specifically:

[0022] is a single-phase sinusoidal modulation wave, is a single modulation wave, , and For three split modulation waves, , , , , and is the driving signal of the power switching device;

[0023] Single-phase sinusoidal modulation wave The single modulation wave is obtained by the single modulation wave generation module ; Single modulation wave Then, after the single modulation wave splitting module, three split modulation waves can be obtained. , and ; , and The driving signal of the power switch device is obtained by sending it to the pulse generation module , , , , and .

[0024] The single modulation wave generation module includes a limit value Saturation unit and a selection switch Switch unit;

[0025] The saturation unit is used to limit the input signal to a given range by giving an upper limit and a lower limit of the signal, and output the upper limit or the lower limit of the saturation value for a signal exceeding the upper limit or the lower limit;

[0026] The upper limits of the three limit values ​​in the limit value Saturation unit are all 0.5, and the lower limits are all -0.5.

[0027] The selection switch unit includes two upper and lower signal input terminals, a "+" terminal and a "-" terminal, a comparison signal input terminal I terminal and a signal output terminal O terminal; when the comparison signal received at the I terminal is greater than or equal to the value behind, the O terminal outputs the signal received at the "+" terminal; when the comparison signal received at the I terminal is less than the value behind, the O terminal outputs the signal received at the "-" terminal; For auxiliary modulation wave;

[0028] The comparison input signals of Switch1 and Switch2 are both single-phase sinusoidal modulation waves. ; After Saturation2, the “+” input signal of Switch1 is obtained. , After adding "1", the "-" input signal of Switch1 is obtained through Saturation3. ;Switch1 output signal Connect to the "-" terminal of Switch2. After subtracting "1", the "+" input signal of Switch2 is obtained through Saturation1. , the signal output by Switch2 That is a single modulation wave.

[0029] The single modulation wave splitting module includes a single-phase sinusoidal modulation wave , select switches Switch3, Switch4, Switch5 and Switch6, split modulation wave , and , single modulation wave and auxiliary modulation wave ;

[0030] The comparison terminal input signals of the selection switches Switch3, Switch4 and Switch5 are all single-phase sinusoidal modulation waves. , the comparison input signal of the selection switch Switch6 is the auxiliary modulation wave ; The input signal of the “+” terminal of Switch3 is a single modulation wave The input signal at the “-” end is -0.5, and the output signal is a split modulation wave ; The input signal of the “+” terminal of Switch4 is 0.5, and the input signal of the “-” terminal is a single modulation wave , the output signal is the auxiliary modulation wave ; The input signal of the “+” terminal of Switch5 is 0.5, and the input signal of the “-” terminal is a single modulation wave , the output signal is a split modulation wave ; The input signal of the “+” terminal of Switch6 is The input signal at the “-” end is -0.5, and the output signal is a split modulation wave .

[0031] The pulse generation module includes a single carrier , Split Modulation Wave , Split Modulation Wave , Split Modulation Wave , three judgment units and drive signals , , , , and ;

[0032] when hour, When high level hour, is low level; when hour, is low level; when hour, is high level;

[0033] when hour, When high level hour, is low level; when hour, is low level; when hour, is high level;

[0034] when hour, When high level hour, is low level; when hour, is low level; when hour, is high level.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0036] 1. The elevator energy recovery converter proposed in the present invention can realize bidirectional energy flow, which can absorb energy from the power grid during the elevator ascending stage and release energy to the power grid during the elevator descending stage, thereby achieving the purpose of energy saving.

[0037] 2. The DC bus capacitor voltage of the elevator energy recovery converter proposed in the present invention has a self-stabilizing effect, which can ensure the balance of the DC bus capacitor voltage, and adopts a multi-level topology, with a large number of output voltage levels, which can effectively reduce the output current harmonics and effectively reduce the impact on the power grid.

[0038] 3. The DC bus capacitor voltage of the elevator energy recovery converter proposed in the present invention has a self-stabilizing effect, has a large number of output voltage levels, can effectively reduce output current harmonics, and effectively reduce the impact on the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 This is the main circuit diagram of the high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-voltage stabilization function of the present invention;

[0041] Figure 2 It is a single carrier modulation principle diagram of a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function according to the present invention;

[0042] Figure 3 It is a schematic diagram of a single modulation wave generation module of a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function according to the present invention;

[0043] Figure 4 It is a schematic diagram of a single modulation wave splitting module of a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function according to the present invention;

[0044] Figure 5 It is a driving signal generation principle diagram of a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function according to the present invention;

[0045] Figure 6 It is an output current and grid voltage waveform diagram of the high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function of the present invention;

[0046] Figure 7 It is an output current and grid voltage waveform diagram of the high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-voltage stabilization function of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1-Figure 7 The present invention provides a technical solution: a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function, comprising:

[0049] The main circuit of the bidirectional elevator energy recovery converter includes a voltage stabilizing circuit, a bidirectional elevator energy recovery converter circuit and an AC side midpoint generating circuit;

[0050] The voltage stabilizing circuit can ensure the balance of the DC bus capacitor voltage, so that the converter has a self-stabilizing function;

[0051] The bidirectional elevator energy recovery converter circuit is used for electric energy recovery in the elevator system, and can recover the regenerative energy generated by the motor and feed it back to the power grid or storage device during the elevator's upward and downward movement;

[0052] The AC side midpoint generating circuit is used for midpoint potential balance control of the bidirectional converter; the circuit provides a stable midpoint potential to achieve symmetrical positive and negative DC bus voltages and balance the load;

[0053] The resistor in the voltage stabilizing circuit One end of the bidirectional elevator energy recovery converter circuit is connected to the silicon carbide power switch device One end of the voltage stabilizing circuit is connected to The other end is connected to the silicon carbide Schottky diode in the bidirectional elevator energy recovery converter circuit The isolation inductor in the bidirectional elevator energy recovery converter circuit is connected to the anode of the elevator; and One end of the series resistor , single-phase power grid and filter inductor The capacitor that creates the AC neutral point in the AC side midpoint generating circuit and connected.

[0054] The voltage stabilizing circuit includes a voltage stabilizing circuit input voltage , Silicon carbide power switching devices that constitute the voltage stabilization circuit ,diode ,inductance , The driving pulse signal , voltage stabilization circuit filter capacitor and resistor ;

[0055] The voltage regulator circuit input voltage The positive electrode and the The drain is connected to the Source and cathode of diode and inductance One end is connected; for The driving pulse signal is used to control Opening and shutting down; and In parallel with the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected in parallel with the DC bus capacitor Both sides.

[0056] The bidirectional elevator energy recovery converter circuit includes a DC bus total voltage , DC bus capacitor , and , Silicon Carbide Power Switching Devices , , , , and , Silicon Carbide Schottky Diode , , , , and ,resistance and isolation inductor , , , , and ;

[0057] The total DC bus voltage Connect the DC bus capacitors in series from top to bottom , and ; Drain and Positive terminal and The cathode end is connected, Source and , , as well as The cathode end is connected to ; Drain and The cathode end is connected, Source and Negative terminal connected; Drain and The cathode end is connected, Source and One end is connected; Drain and Negative terminal connected, Source and The cathode end is connected; Source and One end is connected, Drain and The cathode end is connected; Drain and One end is connected, Source and Negative terminal connected; Anode terminal and , and connected; Anode terminal and One end is connected; Anode terminal and The anode ends are connected; Anode terminal and One end is connected; Anode terminal and Negative terminal connected; Anode terminal and DC bus capacitor Negative terminal connected; and and Connected, intersecting at a point ; , and Connected, intersecting at a point ; and The other end is connected, and connected in series from left to right , and .

[0058] The AC side midpoint generating circuit includes a capacitor for generating an AC neutral point. and and resistor and ;

[0059] The capacitor Positive terminal and The cathode end is connected, Negative terminal and The other end is connected; and Connect in parallel and Both sides.

[0060] The driving pulse signal in the voltage stabilizing circuit is generated by single carrier modulation, and the single carrier modulation includes a single modulation wave generating module, a single modulation wave splitting module and a pulse generating module;

[0061] The single modulation wave generation module is used to limit and select the signal to obtain a single modulation wave ;

[0062] The single modulation wave splitting module is used to split a single modulation wave signal into multiple component signals;

[0063] The pulse generation module is used to generate a driving pulse signal;

[0064] The single carrier modulation is a basic digital modulation technique, in which the transmitted data is modulated onto a single carrier frequency; the single carrier modulation occupies only one frequency band in the frequency domain.

[0065] The single carrier modulation is specifically:

[0066] is a single-phase sinusoidal modulation wave, is a single modulation wave, , and For three split modulation waves, , , , , and is the driving signal of the power switching device;

[0067] Single-phase sinusoidal modulation wave The single modulation wave is obtained by the single modulation wave generation module ; Single modulation wave Then, after the single modulation wave splitting module, three split modulation waves can be obtained. , and ; , and The driving signal of the power switch device is obtained by sending it to the pulse generation module , , , , and .

[0068] The single modulation wave generation module includes a limit value Saturation unit and a selection switch Switch unit;

[0069] The saturation unit is used to limit the input signal to a given range by giving an upper limit and a lower limit of the signal, and output the upper limit or the lower limit of the saturation value for a signal exceeding the upper limit or the lower limit;

[0070] The upper limits of the three limit values ​​in the limit value Saturation unit are all 0.5, and the lower limits are all -0.5.

[0071] The selection switch unit includes two upper and lower signal input terminals, a "+" terminal and a "-" terminal, a comparison signal input terminal I terminal and a signal output terminal O terminal; when the comparison signal received at the I terminal is greater than or equal to the value behind, the O terminal outputs the signal received at the "+" terminal; when the comparison signal received at the I terminal is less than the value behind, the O terminal outputs the signal received at the "-" terminal; For auxiliary modulation wave;

[0072] The comparison input signals of Switch1 and Switch2 are both single-phase sinusoidal modulation waves. ; After Saturation2, the “+” input signal of Switch1 is obtained. , After adding "1", the "-" input signal of Switch1 is obtained through Saturation3. ;Switch1 output signal Connect to the "-" terminal of Switch2. After subtracting "1", the "+" input signal of Switch2 is obtained through Saturation1. , the signal output by Switch2 That is a single modulation wave.

[0073] The single modulation wave splitting module includes a single-phase sinusoidal modulation wave , select switches Switch3, Switch4, Switch5 and Switch6, split modulation wave , and , single modulation wave and auxiliary modulation wave ;

[0074] The comparison terminal input signals of the selection switches Switch3, Switch4 and Switch5 are all single-phase sinusoidal modulation waves. , the comparison input signal of the selection switch Switch6 is the auxiliary modulation wave ; The input signal of the “+” terminal of Switch3 is a single modulation wave The input signal at the “-” end is -0.5, and the output signal is a split modulation wave ; The input signal of the “+” terminal of Switch4 is 0.5, and the input signal of the “-” terminal is a single modulation wave , the output signal is the auxiliary modulation wave ; The input signal of the “+” terminal of Switch5 is 0.5, and the input signal of the “-” terminal is a single modulation wave , the output signal is a split modulation wave ; The input signal of the “+” terminal of Switch6 is The input signal at the “-” end is -0.5, and the output signal is a split modulation wave .

[0075] The pulse generation module includes a single carrier , Split Modulation Wave , Split Modulation Wave , Split Modulation Wave , three judgment units and drive signals , , , , and ;

[0076] when hour, When high level hour, is low level; when hour, is low level; when hour, is high level;

[0077] when hour, When high level hour, is low level; when hour, is low level; when hour, is high level;

[0078] when hour, When high level hour, is low level; when hour, is low level; when hour, is high level.

[0079] In an embodiment of the present invention,

[0080] The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function proposed in the present invention is experimentally verified by conducting simulation experiments in MATLAB / Simulink;

[0081] DC Source and Both , The driving pulse signal The duty cycle is set to , for , for , , and Both , and for , 10Ω, is 1Ω, and Both ,inductance , , , , , and Both ;

[0082] Figure 6 The output current and grid voltage waveforms of the elevator energy recovery converter in the inverter state. It can be seen that the grid voltage and output current The phase is reversed, indicating that the elevator energy recovery converter is in the inverter state, and the energy flows from the DC side to the AC side; at the same time, the current output High sinusoidality and low distortion rate;

[0083] Figure 7 The output current and grid voltage waveform of the elevator energy recovery converter in the rectification state. It can be seen that the grid voltage and output current In phase, it means that the elevator energy recovery converter is in rectification state, and energy flows from the AC side to the DC side; and the current output Also, it has high sinusoidality, low distortion rate and low harmonic content;

[0084] This verifies the effectiveness of the high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function proposed in the present invention.

[0085] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0086] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. High-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function, characterized by: The main circuit of the bidirectional elevator energy recovery converter includes a voltage stabilizing circuit, a bidirectional elevator energy recovery converter circuit and an AC side midpoint generating circuit; The voltage stabilizing circuit can ensure the balance of the DC bus capacitor voltage, so that the converter has a self-stabilizing function; The bidirectional elevator energy recovery converter circuit is used for electric energy recovery in the elevator system, and can recover the regenerative energy generated by the motor and feed it back to the power grid or storage device during the elevator's upward and downward movement; The AC side midpoint generating circuit is used for midpoint potential balance control of the bidirectional converter; the circuit provides a stable midpoint potential to achieve symmetrical positive and negative DC bus voltages and balance the load; The resistor in the voltage stabilizing circuit One end of the bidirectional elevator energy recovery converter circuit is connected to the silicon carbide power switch device One end of the voltage stabilizing circuit is connected to The other end is connected to the silicon carbide Schottky diode in the bidirectional elevator energy recovery converter circuit The isolation inductor in the bidirectional elevator energy recovery converter circuit is connected to the anode of the and One end of the series resistor , single-phase power grid and filter inductor The capacitor that creates the AC neutral point in the AC side midpoint generating circuit and connected.

2. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 1 is characterized in that: The voltage stabilizing circuit includes a voltage stabilizing circuit input voltage , Silicon carbide power switching devices that constitute the voltage stabilization circuit ,diode ,inductance , The driving pulse signal , voltage stabilization circuit filter capacitor and resistor ; The voltage regulator circuit input voltage The positive electrode and the The drain is connected to the Source and cathode of diode and inductance One end is connected; for The driving pulse signal is used to control Opening and shutting down; and In parallel with the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected in parallel with the DC bus capacitor Both sides.

3. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 1 is characterized in that: The bidirectional elevator energy recovery converter circuit includes a DC bus total voltage , DC bus capacitor , and , Silicon Carbide Power Switching Devices , , , , and , Silicon Carbide Schottky Diode , , , , and ,resistance and isolation inductor , , , , and ; The total DC bus voltage Connect the DC bus capacitors in series from top to bottom , and ; Drain and Positive terminal and The cathode end is connected, Source and , , as well as The cathode terminal is connected to ; Drain and The cathode end is connected, Source and Negative terminal connected; Drain and The cathode end is connected, Source and One end is connected; Drain and Negative terminal connected, Source and The cathode end is connected; Source and One end is connected, Drain and The cathode end is connected; Drain and One end is connected, Source and Negative terminal connected; Anode terminal and , and connected; Anode terminal and One end is connected; Anode terminal and The anode ends are connected; Anode terminal and One end is connected; Anode terminal and Negative terminal connected; Anode terminal and DC bus capacitor Negative terminal connected; and and Connected, intersecting at a point ; , and Connected, intersecting at a point ; and The other end is connected, and connected in series from left to right , and .

4. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 1, characterized in that: The AC side midpoint generating circuit includes a capacitor for generating an AC neutral point. and and resistor and ; The capacitor Positive terminal and The cathode end is connected, Negative terminal and The other end is connected; and Connect in parallel and Both sides.

5. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 2, characterized in that: The driving pulse signal in the voltage stabilizing circuit is generated by single carrier modulation, and the single carrier modulation includes a single modulation wave generating module, a single modulation wave splitting module and a pulse generating module; The single modulation wave generation module is used to limit and select the signal to obtain a single modulation wave ; The single modulation wave splitting module is used to split a single modulation wave signal into multiple component signals; The pulse generation module is used to generate a driving pulse signal; The single carrier modulation is a basic digital modulation technique in which the transmitted data is modulated onto a single carrier frequency; Single carrier modulation occupies only one frequency band in the frequency domain.

6. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 5, characterized in that: The single carrier modulation is specifically: is a single-phase sinusoidal modulation wave, is a single modulation wave, , and For three split modulation waves, , , , , and is the driving signal of the power switching device; Single-phase sinusoidal modulation wave The single modulation wave is obtained by the single modulation wave generation module ; Single modulation wave Then, after the single modulation wave splitting module, three split modulation waves can be obtained. , and ; , and The driving signal of the power switch device is obtained by sending it to the pulse generation module , , , , and .

7. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 5, characterized in that: The single modulation wave generation module includes a limit value Saturation unit and a selection switch Switch unit; The saturation unit is used to limit the input signal within a given range by giving an upper limit and a lower limit of the signal, and output the upper limit or the lower limit of the saturation value for a signal exceeding the upper limit or the lower limit; The upper limits of the three limit values ​​in the limit value Saturation unit are all 0.5, and the lower limits are all -0.

5.

8. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 7, characterized in that: The selection switch unit includes two upper and lower signal input terminals, a "+" terminal and a "-" terminal, a comparison signal input terminal I terminal and a signal output terminal O terminal; When the comparison signal received at the I terminal is greater than or equal to the value behind it, the O terminal outputs the signal received at the "+" terminal; When the comparison signal received at the I terminal is less than the value behind, the O terminal outputs the signal received at the "-" terminal; is the auxiliary modulation wave; The comparison input signals of Switch1 and Switch2 are both single-phase sinusoidal modulation waves. ; After Saturation2, the "+" input signal of Switch1 is obtained , After adding "1", the "-" input signal of Switch1 is obtained through Saturation3. ; Switch1 output signal Connect to the "-" terminal of Switch2. After subtracting "1", the "+" input signal of Switch2 is obtained through Saturation1. , the signal output by Switch2 That is a single modulation wave.

9. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 5, characterized in that: The single modulation wave splitting module includes a single-phase sinusoidal modulation wave , Select switches Switch3, Switch4, Switch5 and Switch6, Split modulation wave , and , single modulation wave and auxiliary modulation wave ; The comparison terminal input signals of the selection switches Switch3, Switch4 and Switch5 are all single-phase sinusoidal modulation waves. , the comparison input signal of the selection switch Switch6 is the auxiliary modulation wave ; The input signal of the "+" terminal of Switch3 is a single modulation wave , the input signal at the "-" end is -0.5, and the output signal is a split modulation wave ; The input signal of the "+" end of Switch4 is 0.5, and the input signal of the "-" end is a single modulation wave , the output signal is the auxiliary modulation wave ; The input signal of the "+" end of Switch5 is 0.5, and the input signal of the "-" end is a single modulation wave , the output signal is a split modulation wave ; The input signal of the "+" terminal of Switch6 is , the input signal at the "-" end is -0.5, and the output signal is a split modulation wave .

10. The high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with self-stabilizing function according to claim 5, characterized in that: The pulse generation module includes a single carrier , Split Modulation Wave , Split Modulation Wave , Split Modulation Wave , three judgment units and drive signals , , , , and ; when hour, When high level hour, is low level; when hour, is low level; when hour, is high level; when hour, When high level hour, is low level; when hour, is low level; when hour, is high level; when hour, When high level hour, is low level; when hour, is low level; when hour, is high level.

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