Manual Download. Total input and output points: 16 points. Input points: 16 points. Output type: DC24V. FX2N extension module. In step S , voltage target value determination unit compares the absolute value of rate of change Vrate of detection voltage RMS Ve with the magnitude of reference value K4. In step S , voltage target value determination unit maintains voltage target value Vref. In step S , since voltage fluctuations and power fluctuations that are greater than an action of the SVR are present, the possibility of a grid fault cannot be ruled out.
Therefore, it may be preferable to not output a reactive power. Thus, voltage control unit sets reactive power command value Qr to zero. This can suppress output of reactive power. Part of a FIG. As illustrated in a of FIG. As illustrated in b of FIG. Part c of FIG. Part d of FIG. As illustrated in c of FIG. As illustrated in d of FIG.
As described above, according to the present embodiment, the power conversion device, which does not receive any information from a central management device, autonomously determines the voltage control deadband, thereby correcting the voltage target value for controlling the reactive power. This allows the voltage of the power distribution grid to be stabilized, without requiring to output a reactive power. The power conversion device also autonomously determines an action performed by the step voltage regulator, using the upper and lower limits for a generally-presumed rate of change of a step voltage.
For voltage fluctuations which may be caused by a grid fault, the reactive power command value is set to zero to stop output of a reactive power output. This can suppress fluctuations of the voltage of the power distribution grid that is caused by unwanted voltage control. Operations corresponding to the operations of power conversion device 50 according to Embodiments 1 and 2 may be implemented in hardware for a digital circuit or software.
If the functionality of power conversion device 50 is implemented using software, a power controller can include, for example, a processor and a memory , as shown in FIG. The presently disclosed embodiments should be considered in all aspects as illustrative and not restrictive.
The scope of the present invention is indicated by the appended claims, rather than by the description above, and all changes that come within the scope of the claims and the meaning and range of equivalency of the claims are intended to be embraced within their scope. A power conversion device in a power conversion system which includes an automatic voltage regulator installed in a power distribution grid and a decentralized power supply, the power conversion device, comprising:.
Jan 11, - Mitsubishi Electric Corporation. Latest Mitsubishi Electric Corporation Patents:. Advantageous Effects of Invention According to the present invention, when it is detected that the automatic voltage regulator has performed an action, the voltage target value is corrected, and, if the voltage at the point of interconnection deviates from the voltage control deadband referenced to the voltage target value, a reactive power is output based on the magnitude of the deviated amount of voltage.
Embodiment 1 FIG. Embodiment 2 Embodiment 2 is now described with reference to a method of stabilization control over the voltage of a power distribution grid included in a power conversion system in which a decentralized power supply system is interconnected with a high-voltage grid. REFERENCE SIGNS LIST 10 substation; 20 step voltage regulator SVR ; 30 central management device; 40 pole transformer; 50 power conversion device; 60 solar power generation; 70 storage battery; 80 load; 90 decentralized power supply system; power conversion system; - a , - b , voltage detector; - a , - b , current detector; correction unit; command unit; voltage detection unit; voltage target value generation unit, current detection unit; control circuit; power converter circuit; memory; processor; memory; SVR action detection unit; voltage target value correction amount calculation unit; overvoltage output unit; limiter, , subtractor; voltage control unit; , adder; reactive power control unit; real power control unit; current control unit; voltage target value determination unit; deadband determination unit; and LA, LA 2 power distribution grid.
The power conversion system according to claim 1, wherein the correction unit detects that the automatic voltage regulator has performed an action, when an absolute value of a rate of change of the voltage at the point of interconnection detected by the voltage detection unit is above a first reference value and an absolute value of a varying amount of a real power output from the power converter circuit is less than a second reference value.
The power conversion system according to claim 2, wherein the correction unit detects that the automatic voltage regulator has performed an action, when the absolute value of the rate of change of the voltage at the point of interconnection detected by the voltage detection unit continues to be above the first reference value for a prescribed time period and the absolute value of the varying amount of the real power output from the power converter circuit is less than the second reference value.
The power conversion system according to claim 2, wherein when the correction unit detects that the automatic voltage regulator has performed an action, the correction unit corrects the voltage target value based on a voltage step width of the automatic voltage regulator.
The power conversion system according to claim 4, wherein when the correction unit detects that the automatic voltage regulator has performed an action, the correction unit corrects the voltage target value by adding an absolute value of the voltage step width of the automatic voltage regulator to the voltage target value when the rate of change of the voltage at the point of interconnection is positive, and subtracting the absolute value of the voltage step width of the automatic voltage regulator from the voltage target value when the rate of change of the voltage at the point of interconnection is negative.
The power conversion system according to claim 1, wherein the command unit includes: a subtractor to output a deviation of the voltage at the point of interconnection from the voltage target value; an overvoltage output unit to output a difference between an absolute value of the deviation and the voltage control deadband when the absolute value of the deviation is above the voltage control deadband, and output zero when the absolute value of the deviation is within or below the voltage control deadband; and a voltage control unit to output a control amount as a reactive power command value, the control amount being obtained by amplifying output of the overvoltage output unit.
The power conversion system according to claim 6, wherein the voltage control deadband is smaller than a voltage control deadband width for the automatic voltage regulator. The power conversion system according to claim 7, comprising a central management device to manage a state of the power distribution grid, wherein the power conversion device receives information indicating the voltage control deadband, from the central management device.
The power conversion system according to claim 1, wherein the correction unit detects that the automatic voltage regulator has performed an action, when an absolute value of a rate of change of the voltage at the point of interconnection detected by the voltage detection unit is above a first reference value and less than a second reference value and an absolute value of a varying amount of a real power output from the power converter circuit is less than a third reference value.
The power conversion system according to claim 9, wherein the correction unit detects that the automatic voltage regulator has performed an action, when the absolute value of the rate of change of the voltage at the point of interconnection detected by the voltage detection unit continues to be above the first reference value and less than the second reference value for a prescribed time period, and the absolute value of the varying amount of the real power output from the power converter circuit is less than the third reference value.
The power conversion system according to claim 9, wherein when the correction unit detects that the automatic voltage regulator has performed an action, the correction unit corrects the voltage target value to a voltage target value upper limit when the rate of change of the voltage at the point of interconnection is positive, and corrects the voltage target value to a voltage target value lower limit when the rate of change of the voltage at the point of interconnection is negative.
The power conversion system according to claim 11, wherein the correction unit sets the voltage target value upper limit and the voltage target value lower limit, based on the voltage target value and a voltage step width of the automatic voltage regulator. The power conversion system according to claim 7, wherein the command unit sets the voltage control deadband based on a distance between the power converter circuit and the automatic voltage regulator. Patent History.
Input points: 14 points. Output form: relay output. Power consumption: 32W. Outline dimension: 90x90x86mm. Third generation standard model.
Easy to use integrated models and flexible scalability. Condensed convenience of using the usual FX3 series. Its high price by the most suitable for small scale control. High speed operation. Basic instructions: 0. Application instruction: 0. Large capacity memory.
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