JP2013258841A5 - - Google Patents

Claims (8)

A plurality of converter units for mutually converting polyphase AC power and DC power;
Multiple transformers,
Consists of a converter controller,
The AC voltage terminals of the converter units are connected in series via the transformers and connected to the power system,
The DC voltage terminals of the converter unit is independently of one another,
The converter control unit is a transformer multiple power converter that controls each converter unit so that a DC voltage of each converter unit becomes a predetermined value. The transformer multiple power conversion device according to claim 1, wherein the DC voltage terminals of the converter units are connected to each other with high impedance. The power supply or the load is connected to the DC voltage terminal of the converter unit, the DC voltage terminals of the converter unit are independent from each other, and the passing power of each converter unit is substantially the same. The transformer multiple power conversion device as described. The transformer multiple power conversion device according to claim 2, wherein the high impedance is a capacitor, and the smoothing capacitors connected to the DC voltage terminals of the converter units are interconnected by the capacitor. The power source or the load is a second transformer multiple power conversion device having the same configuration as the transformer multiple power conversion device, and the DC voltage terminal of each converter unit and the second transformer multiple power conversion device The transformer multiple power conversion device according to claim 3, wherein a DC voltage terminal of each converter unit is connected. The converter control unit includes a DC voltage detector that detects a DC voltage of each converter unit;
A voltage phase detection unit for detecting a voltage phase reference from an AC voltage detected by an AC voltage detector installed on a connection line to the power system;
An effective reactive current detector for detecting an active current and a reactive current of an alternating current output to the power system based on the voltage phase reference from an alternating current detected by a current detector installed on a connection line to the power system; ,
Based dc voltage detection value and the DC voltage command value, a DC voltage control unit that calculates the active current command value,
A unit individual DC voltage controller that calculates a DC voltage correction value of the DC voltage based on the effective current, the reactive current, and the DC voltage detection value so that the DC voltages of the converter units are the same; ,
A reactive current control unit that calculates a reactive voltage reference value related to the reactive current so that the reactive current matches the reactive current command value;
An active current control unit that calculates an effective voltage reference value related to the active current so that the active current matches an active current command value;
Based on the output invalid voltage reference value, the effective voltage reference value, the DC voltage correction value, and the voltage phase reference, a voltage reference value generation unit that calculates an output AC voltage reference value of each converter unit;
Based on the AC voltage reference value, a gate pulse signal generator for generating a gate pulse signal for driving the switching elements of the respective converter unit,
The transformer multiple power conversion device according to any one of claims 1 to 5, comprising: The DC voltage control unit calculates a DC voltage representative value from the DC voltage detection value, calculates the effective current command value so that the DC voltage representative value matches the DC voltage command value,
The unit individual DC voltage control unit includes a controller that controls a deviation between the DC voltage representative value and the DC voltage detection value to be zero, and the effective DC voltage is calculated from a voltage correction value related to active power that is an output of the controller The transformer multiple power conversion device according to claim 6, wherein an effective voltage correction value related to a current and a reactive voltage correction value related to the reactive current are calculated. The DC voltage control unit calculates a DC voltage representative value from the DC voltage detection value, calculates the effective current command value so that the DC voltage representative value matches the DC voltage command value,
The unit individual DC voltage control unit includes a controller that controls a deviation between the DC voltage representative value and the DC voltage detection value to zero, and an effective voltage related to the active current from an active power deviation that is an output of the controller. The transformer multiple power conversion device according to claim 6, which is configured to calculate a correction value and a reactive voltage correction value related to the reactive current.