NOVELTY - The converter (11) has frequency control circuit (50) that produces electrical angle of single phase voltage type AC/DC converting circuit (40) based on voltage related to phase difference from frequency command signal and phase difference generating circuit (30). The voltage command signal is added to the multiplied signal value based on electrical angle and standard voltage from frequency control circuit. A low-order voltage control circuit (60) outputs difference of electromotive voltage and single phase alternating voltage as pulse width modulation (PWM) command.    USE - Single phase voltage type alternating current/direct current (AC/DC) converter for grid connection apparatus used as power supply of electric power system and uninterruptible power system, and inverter for distributed power supply such as inverter for photovoltaic power generation, inverter for fuel cell, inverter for electrical storage system, and inverter for wind power generation with DC link, rectifier, reactive power compensating device (SVC).    ADVANTAGE - The autonomous parallel running with each grid apparatus is controlled by user and an output deviation of system is controlled, when connecting parallelly and carrying out the parallel running of multiple units by single phase alternating current, so that the single phase voltage type AC/DC converter can independently control an active power and a reactive power. The autonomous parallel running compensates the voltage bias with respect to electric power system, so that the reliability of apparatus is increased, and the distribution of single phase voltage type AC/DC converter is attained. The single phase voltage type AC/DC converter can make a single phase alternating voltage to track the frequency of electric power system. The single phase voltage type AC/DC converter can prevent an excessive high-order instruction vector as input and abnormal single phase alternating current as output to the electric power system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the single phase voltage type AC/DC converter. (Drawing includes non-English language text)    Single phase voltage type AC/DC converter (11)    Phase difference generating circuit (30)    Single phase voltage type AC/DC converting circuit (40)    Frequency control circuit (50)    Low-order voltage control circuit (60)