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Energy management system

An energy management system, DC voltage technology, applied in the direction of control/regulation system, energy saving and emission reduction, adjusting electric variables, etc., can solve the problem of unable to output power

Active Publication Date: 2017-08-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a solar power generation system, if the HDVC bus voltage fluctuates due to the increase or decrease of the power generation of the solar power generation device, it may not be possible to stably output constant power from the inverter.

Method used

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Embodiment Construction

[0028] figure 1 It is a figure which shows the energy management system 1 which concerns on this embodiment.

[0029] The energy management system 1 includes a power generation device 20 , a bidirectional DC-DC converter 30 , an inverter 40 , and a control unit 50 . The power generation device 20 , the bidirectional DC-DC converter 30 and the inverter 40 are connected to the HVDC bus 10 .

[0030] The power generation device 20 includes a photovoltaic power generation panel 21 and a PV inverter 22 . The PV inverter 22 outputs the electric power generated by the photovoltaic power generation panel 21 to the HVDC bus 10 . In addition, the power generation device 20 may be a wind power generation device, a gas power generation device, or the like.

[0031] The power generator 20 detects an output voltage and an output current, and performs maximum power point tracking (MPPT: Maximum Power Point Tracking) control for maximizing output power based on the output voltage and the o...

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PUM

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Abstract

This energy management system (1) is provided with a power generating device (20), a bidirectional DC-DC converter (30) and an inverter (40), which are connected to an HVDC bus (10). The bidirectional DC-DC converter (30) and the inverter (40) each have the same voltage change gain relative to a change in current. If the output power from the inverter (40) or the bidirectional DC-DC converter (30) varies concomitant with a variation in the output current from the power generating device (20), the energy management system (1) adjusts an offset delta V of the gain characteristic of the bidirectional DC-DC converter (30) relative to the gain characteristic of the inverter (40), and causes the output power from the inverter (40) to converge to a target value. In this way it is possible to provide an energy management system with which the output power of an inverter can be stabilized using simple control.

Description

technical field [0001] The present invention relates to an energy management system using electric power generated in a home environment or a factory or the like. Background technique [0002] A solar power generation system that uses power generated by a generator such as a solar panel in a home environment, etc., includes a DC voltage bus (hereinafter referred to as HDVC) that transmits the power generated by the generator or stored in a storage battery to the power system. bus). A PV converter, an inverter, a bidirectional DC-DC converter, and the like are connected to the HDVC bus. A PV inverter outputs electric power generated by a solar power generation device at a given voltage. A storage battery is connected to the bidirectional DC-DC converter, which converts the DC voltage supplied and received between the storage battery and the HDVC bus into a given constant voltage. In such a solar power generation system, if the HDVC bus voltage fluctuates due to an increase...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J7/35H02M3/00H02M7/48
CPCH02J7/35Y02P90/50H02J2300/26H02J3/381Y02E10/56H02J7/0013
Inventor 马跃辻仁司
Owner MURATA MFG CO LTD