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Power conversion control device and solar power generation system

A control device and power conversion technology, applied in control/regulation systems, circuit devices, emergency protection circuit devices, etc., can solve problems such as difficulty in dealing with sudden voltage changes, and achieve the effects of improving reliability and reducing costs

Active Publication Date: 2019-03-22
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these techniques use filters that take time to converge, so it is difficult to respond to sudden changes in voltage

Method used

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  • Power conversion control device and solar power generation system
  • Power conversion control device and solar power generation system
  • Power conversion control device and solar power generation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0051]

[0052] figure 1 It is an explanatory diagram showing an example of the configuration of the solar power generation system 10 according to the first embodiment.

[0053] Such as figure 1 As shown, a solar power generation system 10 has a solar cell array 11 , a power conditioning system 12 and a user interface 50 . The solar cell array 11 is constituted by a plurality of solar cell panels formed by arranging a plurality of solar cells. A solar cell unit converts sunlight energy into electricity.

[0054] A power conditioning system 12 serving as a power conversion control device is connected between the solar cell array 11 and a three-phase 200V power system PW supplied by a power company or the like. The power conditioning system 12 converts the DC voltage generated by the solar cell array 11 into an AC voltage, and makes it equal to the voltage and frequency of the power system PW.

[0055] The power conditioning system 12 has voltage sensors 15 , 16 , a main ci...

Embodiment approach 2

[0157]

[0158] In the above Embodiment 1, the figure 1 Although the voltage control unit 27 has a hardware configuration, the function of the voltage control unit 27 can also be realized by program processing. Therefore, in the second embodiment, control processing when the function of the voltage control unit 27 is realized by a program will be described.

[0159] 〈Structure of the control part〉

[0160] In addition, other functions in the control unit 22 , that is, each function of the MPPT control unit 25 , the current control unit 26 , and the PWM control unit 28 are also processed by programs.

[0161] In this case, the control unit 22 is constituted by a microcomputer or the like, for example, in figure 1 A program for realizing the function of the voltage control unit 27 is stored in the memory 24 . Similarly, programs for realizing the respective functions of the MPPT control unit 25 , the current control unit 26 , and the PWM control unit 28 are also stored in t...

Embodiment approach 3

[0182]

[0183] In the third embodiment, the voltage control unit 27 of the control unit 22 has a function of generating a door lock signal GB in addition to the function of passing through / bypassing the phase shift filters 31 and 32 in the first embodiment.

[0184] The voltage control unit 27 included in the control unit 22 compares the sudden variable with a new threshold TH2 serving as the second threshold, and generates a door lock signal GB when the threshold TH2 is larger. Threshold TH2 and threshold TH1 are different thresholds.

[0185]

[0186] Figure 7 It is an explanatory diagram showing an example of the configuration of the solar power generation system 10 according to the third embodiment.

[0187] Figure 7 The solar power generation system 10 shown is the same as that of Embodiment 1 above. figure 1 The difference lies in the newly provided "OR" circuit 46. The other configurations are the same, so descriptions are omitted.

[0188] A door lock contr...

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Abstract

When the voltage of the power system drops instantaneously, the overcurrent is suppressed, and the unbalanced current is suppressed by the unbalance compensation when the voltage of the power system drops. The power conditioning system includes a voltage control unit (27) that generates a voltage compensation signal based on the current control signal and the detection voltage. The voltage control unit (27) has an overcurrent suppression unit composed of differentiators (42, 43), a square adder (44), a comparison unit (45), and a switch (34). The overcurrent suppressing unit calculates an abrupt variable indicating a change ratio of the voltage of the electric power system based on the input voltage before separation of the normal phase and the reverse phase of the voltage of the electric power system and the output voltage after separation, where the abrupt variable is larger than the first threshold value In the case of , the input voltage is used as the detection voltage, and when the abrupt variable is smaller than the first threshold value, the output voltage is used as the detection voltage.

Description

technical field [0001] The present invention relates to a power conversion control device and a solar power generation system, and more particularly to a technique contributing to operation control capable of stably supplying power to a power system. Background technique [0002] In recent years, with the increasing attention to renewable energy and the guidance of the government's power purchase system, solar power generation systems based on solar cells (PV: Photovoltaic, photovoltaic) have been greatly developed. [0003] Along with this, in the solar power generation system, there is an increasing demand for a power conditioning system for smoothly connecting the power of the solar cell to the power system. [0004] The basic function of the power conditioning system is to make the output voltage and frequency consistent with each power system, and to convert DC power generated by PV into AC. However, when the voltage of the power system changes suddenly due to an accid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02J3/38H02M1/12G05F1/67H02J3/26H02M1/32H02M7/5387H02M7/5395
CPCG05F1/67H02H7/122H02J3/26Y02E40/50H02M1/126H02M1/32H02M7/5387H02M7/5395H02J2300/24H02J3/381Y02E10/56
Inventor 古田太松永俊佑栗田将纪
Owner HITACHI IND EQUIP SYST CO LTD
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