Active mode adjustment device for AC load characteristic

Active bi-directional electric power adjuster

Distribution type electric power system island movement detection device and method

Three-arm power conversion device

The invention discloses a three-arm power conversion device, which comprises a first output/input port, a second output/input port, a third output/input port, a three-arm bridge circuit, a controller, a filter circuit and a decoupling loop element. The three-arm power conversion device is only provided with an electric converter and the three-arm bridge circuit, only controls a first current component and a second current component of a second output/input current of a middle end point of the two arms in the three-arm bridge circuit by using the controller to convert electric energy among the first output/input port, the second output/input port and the third output/input port, and has multiple functions according to various circuits which are connected with the output/input ports. Therefore, the three-arm power conversion device can convert the electric energy among the output/input ports only by using the three-arm bridge circuit, and effectively simplifies a power circuit and a control ...

Active bi-directional electric power adjuster

This invention relates to an active two-way power regulator including a DC end, a two-way DC/DC power converter, a DC/AC inverter and an AC end, in which, said DC end can be connected to a DC supply, said two-way DC/DC converter utilizes a HF pulse width modulation technology to generate a pre-set DC voltage or a DC current, said DC/AC inverter is taken as a LF reversing gear to convert the DC voltage or current to a preset AC voltage or current and the AC end can be connected to a load and an AC supply selectively.

Spare electric power supplying system of zero interrupt converting time

The standby electric power supplies power by its first AC power when the first AC power is at normal condition. When the first AC power is failure the power supply is automatically switched into the second AC power by zero power failure transfer time. When the first AC power is normal the DC/AC power transducer controlling the second AC power outputs current approaching to zero so that its output mechanical type switch can be kept at closing state. Thereby the circulation between the first AC power and DC/AC power transducer will be not generated and the zero power failure transfer time can be implemented.

Device and method for charging rechargeable battery of independent generating system

The invention relates to a device and a method for a charging rechargeable battery of an independent generating system having a maximum power tracking function. The device comprises a DC to DC converter and a control circuit, wherein the control circuit is arranged for controlling the DC to DC converter. The method for charging the rechargeable battery comprises the steps of: starting the maximum power tracking function when the output power of the independent generating system is smaller, wherein the charging current is continuous current; adopting a pulse current charging method when the independent generating system is bigger; continuously performing the maximum power tracking function when the power is not higher than the sum of a loading power and a preset maximum pulse charging power of the rechargeable battery; stopping the maximum power tracking function once the output power of the independent generating system is higher than the sum of the loading power and the preset maximum ...

Bidirection DC/DC converter with neutral point

A double way DC/ DC transformation device with neutral point, including: the first DC voltage end and the second DC voltage end with neutral point; the inductor for energy buffering; the first electronic power switch that series connects to the inductor and bridge joint with the positive and the negative poles of the first DC voltage end and controls the storage and delivery of the induction; the second electronic power switch with one end connecting to the inductor and the joint point of the first electronic power switch, and the other end connecting to the positive pole of the DC voltage and controls the energy storage and delivery of the inductor; the first and the second diodes parallel to the first and the second electronic power switches; the condenser bridge joints between the positive end of the first and the second DC voltage to store the delivery of the inductor; the controller connects to the controlling end of the electronic power switch to control the conduction and break of ...

Active harmonic wave suppressing device and control method

The present invention is active harmonic suppression device and its control method. The device includes one serial LC combination comprising one energy accumulating capacitor, one electric energy converter, one filtering inductor and one virtual power compensating capacitor; one filtering CR combination and one control circuit. The energy accumulating capacitor provides one first voltage; the electric energy converter connected electrically to the energy accumulating capacitor switches the first voltage to output and provide one compensating voltage; and the serial LC combination and the filtering CR combination convert the compensating voltage into one compensating current injected to power line to eliminate the harmonic current the load produces and to make the power supply current possess sinusoidal waveform. The control method of the device includes calculating expected output voltage, pulse width regulation to produce switching signal and injecting compensating current.

Three-arm power conversion device

The invention discloses a three-arm power conversion device, which comprises a first output/input port, a second output/input port, a third output/input port, a three-arm bridge circuit, a controller, a filter circuit and a decoupling loop element. The three-arm power conversion device is only provided with an electric converter and the three-arm bridge circuit, only controls a first current component and a second current component of a second output/input current of a middle end point of the two arms in the three-arm bridge circuit by using the controller to convert electric energy among the first output/input port, the second output/input port and the third output/input port, and has multiple functions according to various circuits which are connected with the output/input ports. Therefore, the three-arm power conversion device can convert the electric energy among the output/input ports only by using the three-arm bridge circuit, and effectively simplifies a power circuit and a control ...

Method and device for controlling direct current/direct current power converter with ripple rejection

The invention discloses a method and a device for controlling a direct current/direct current power converter with input direct current voltage ripple rejection. The method comprises the following steps of: detecting an output voltage of the direct current/direct current converter by a voltage-detecting unit; delivering the detected output voltage to an input ripple voltage suppression circuit and an output voltage-stabilizing control circuit to compute an alternating current control signal and a direct current control signal respectively; adding the alternating current control signal and the direct current control signal together to obtain a control signal; and finally transmitting the control signal to a pulse width modulation circuit as a modulating signal to obtain a driving signal of a power switch element of the direct current/direct current power converter to further suppress the input direct current voltage ripple which is caused by the output voltage ripple of the direct current ...

Method and device for controlling direct current/direct current power converter with ripple rejection

The invention discloses a method and a device for controlling a direct current/direct current power converter with input direct current voltage ripple rejection. The method comprises the following steps of: detecting an output voltage of the direct current/direct current converter by a voltage-detecting unit; delivering the detected output voltage to an input ripple voltage suppression circuit and an output voltage-stabilizing control circuit to compute an alternating current control signal and a direct current control signal respectively; adding the alternating current control signal and thedirect current control signal together to obtain a control signal; and finally transmitting the control signal to a pulse width modulation circuit as a modulating signal to obtain a driving signal ofa power switch element of the direct current/direct current power converter to further suppress the input direct current voltage ripple which is caused by the output voltage ripple of the direct current/ ...

Active electric power regulating mechanism

The invention relates to an active power adjusting device which comprises a first group of power electronic switch element series circuits, a second group of power electronic switch element series circuits and a third group of power electronic switch element series circuits. The active power adjusting device utilizes one of the second group of power electronic switch element series circuits and the third group of power electronic switch element series circuits to carry out high-frequency switching when power supply voltage is changed, other two groups of power electronic switch element seriescircuits are utilized to carry out low-frequency switching. Therefore, the active power adjusting device can maintain the voltage stability of the two end points of a load and does not need to arrangea DC capacitor to stabilize DC voltage.

Cell health state diagnosis method

The invention is a method for diagnosing battery health state, comprising the steps of: providing discharge voltage and current data of a battery; setting a preset time interval and acceptable valuesof discharge current variation in the preset time interval; analyzing the changes of the discharge voltage and current data in the preset time interval; recording the discharge voltage and current data and the change data; comparing the discharge voltage data with the change data within the acceptable values of discharge current variation; and displaying the comparative result with a health statediagnosis pointer.

Solar energy generation system maximum power tracking method and device

A solar energy power generation system maximum power tracking method and device; a direct current/direct current transformation device is connected with a solar energy battery group; a controller operates the direct current/direct current transformation device into an electricity energy transformation device with the character of active resistance to supply power to a direct current/direct currentelectricity energy transformation device or direct current load; a maximum power tracking circuit is used to regulate the direct current/direct current transformation device and change the quantity of the operated active resistance; variable quantity of the output power of the solar energy battery group is observed by the user; if the variable quantity of the output power of the solar energy battery group is positive, the direct current/direct current transformation device is continuous to be regulated so that the property of the active resistance is changed in the same direction; otherwise,if ...

Solar energy generation system most power tracking method and device

A solar energy power generation system maximum power tracking method and device; a direct current/direct current transformation device is connected with a solar energy battery group; a controller operates the direct current/direct current transformation device into an electricity energy transformation device with the character of active resistance to supply power to a direct current/direct current electricity energy transformation device or direct current load; a maximum power tracking circuit is used to regulate the direct current/direct current transformation device and change the quantity of the operated active resistance; variable quantity of the output power of the solar energy battery group is observed by the user; if the variable quantity of the output power of the solar energy battery group is positive, the direct current/direct current transformation device is continuous to be regulated so that the property of the active resistance is changed in the same direction; otherwise, if ...

Solar-battery-module shielding-compensating device

The invention provides a solar-battery-module shielding-compensating device, which comprises an input port, an isolated DC (Direct Current)-DC electric-energy converter and an output port. The input port of the solar-battery-module shielding-compensating device is connected to both ends of a solar-battery array which comprises a plurality of series solar-battery modules, and the output port of the solar-battery-module shielding-compensating device is connected to one solar-battery module of the solar-battery array; when the solar-battery module connected with the output port is shielded or partially shielded, compensating current is output by the isolated DC-DC electric-energy converter and injected into the solar-battery module connected with the output port, so as to increase the voltage of the shielded or partially-shielded solar-battery module and increase the output voltage and the power of the solar-battery array. Through the solar-battery-module shielding-compensating device, the ...

Active electric power regulating mechanism

The invention relates to an active power adjusting device which comprises a first group of power electronic switch element series circuits, a second group of power electronic switch element series circuits and a third group of power electronic switch element series circuits. The active power adjusting device utilizes one of the second group of power electronic switch element series circuits and the third group of power electronic switch element series circuits to carry out high-frequency switching when power supply voltage is changed, other two groups of power electronic switch element series circuits are utilized to carry out low-frequency switching. Therefore, the active power adjusting device can maintain the voltage stability of the two end points of a load and does not need to arrange a DC capacitor to stabilize DC voltage.

Direct current/alternating current transformer

The invention discloses a direct current/alternating current transformer, which comprises a direct current power supply input port, a buck converter, a boost/buck converter, an output filter and an alternating current output port, wherein the direct current power supply input port of the direct current/alternating current transformer is provided with a positive input end and a negative input end which are connected to a direct current power supply; the alternating current output port is connected to a single-phase alternating current commercial power system; when the single-phase alternating current commercial power system is in a positive half cycle, the buck converter acts to generate a positive half cycle signal of alternating current sinusoid current; when the single-phase alternating current commercial power system is in a negative half cycle, the boost/buck converter acts to generate a negative half cycle signal of alternating current sinusoid current; no matter the single-phase alternating ...