JPH01105342U

JPH01105342U -

Info

Publication number: JPH01105342U
Application number: JP20142887U
Authority: JP
Priority date: 1987-12-28
Filing date: 1987-12-28
Publication date: 1989-07-17

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図および第３図はそれぞれ第１図の
回路の要部の具体構成を示すブロツク図、第４図
は負荷が純抵抗であるときの第１図の各部の波形
図、第５図は負荷が遅れ力率であるときの第１図
の各部の波形図、第６図は負荷が進み力率である
ときの第１図の各部の波形図、第７図は従来例の
構成を示すブロツク図、第８図および第９図はそ
れぞれ第７図の回路の要部の具体構成を示すブロ
ツク図、第１０図は第７図の回路の等価回路図、
第１１図は各電圧、電流の位相関係の説明図であ
る。１……電力系統、２……負荷、３……発電機、
５……遮断用スイツチ、９……無効電力検出回路
、１０……基準値発生回路、１１……誤差検出回
路、１３……界磁電圧制御回路。 Figure 1 is a block diagram showing the configuration of one embodiment of this invention, Figures 2 and 3 are block diagrams showing the specific configuration of the main parts of the circuit in Figure 1, respectively, and Figure 4 shows a circuit in which the load is a pure resistance. Figure 5 is a waveform diagram of each part in Figure 1 when the load is a lagging power factor, Figure 6 is a waveform diagram of each part in Figure 1 when the load is a leading power factor. 7 is a block diagram showing the configuration of the conventional example, FIGS. 8 and 9 are block diagrams showing the specific configuration of the main parts of the circuit in FIG. 7, and FIG. Equivalent circuit diagram of the circuit in Figure 7,
FIG. 11 is an explanatory diagram of the phase relationship of each voltage and current. 1... Power system, 2... Load, 3... Generator,
5... Cutoff switch, 9... Reactive power detection circuit, 10... Reference value generation circuit, 11... Error detection circuit, 13... Field voltage control circuit.

Claims

[Claims for Utility Model Registration] A grid-connected power supply device that connects with an electric power system and supplies power to a load, comprising: a generator that generates alternating current power at the same frequency as that of the electric power system; A cutoff switch provided between the load and the load, a reactive power detection circuit that detects the reactive power supplied from the generator to the load, and a reactive power reference that alternately changes between zero and a predetermined positive or negative value. a reference value generation circuit that generates a value; an error detection circuit that determines the error between the reactive power reference value output from the reference value generation circuit and the reactive power value detected by the reactive power detection circuit; and this error detection circuit. a field voltage control circuit that causes reactive power supplied from the generator to a load to follow a reactive power reference value by controlling the field voltage of the generator according to the output voltage of the generator; When the voltage across the load exceeds an upper threshold voltage, which is higher than the voltage of the power system, and falls below a lower threshold voltage, which is lower than the voltage of the power system, for a certain period of time or more, the cutoff switch is activated. A power supply device for grid connection equipped with a disconnection detection circuit that opens a grid.