KR-20260065630-A - home power total control system using PEMFC

Abstract

The present invention relates to a household power integrated control system applying a PEMFC, comprising: an isolated DC/DC converter that converts power generated from a polymer electrolytic fuel cell into a DC voltage through first and second common input lines and outputs it; a bidirectional DC/DC converter connected to an energy storage device and converting the DC voltage in both directions; an MPPT converter connected to a solar panel, controlled by maximum power point tracking, and constructed with a switch element, an inductor, and a capacitor; a DAB converter capable of boosting power input through first and second common input lines and outputting it through first and second common output lines; a bidirectional single-phase inverter capable of converting the DC voltage output from the DAB converter into an AC voltage and supplying it to the grid power supply; and a control unit that controls the operation of the isolated DC/DC converter, the bidirectional DC/DC converter, the MPPT converter, the DAB converter, and the bidirectional single-phase inverter. A residential power integrated control system utilizing such a PEMFC offers the advantages of increasing self-generated power capacity, facilitating power control and management with the grid, and enabling stable power control even when the voltage fluctuation range of the solar panel output widens.

Inventors

• 정판검
• 정인성
• 최성균
• 마서빈

Assignees

• 재단법인 녹색에너지연구원

Dates

Publication Date

20260511

Application Date

20241029

Claims (5)

1. Polymer electrolyte fuel cell and; An isolated DC/DC converter that converts power generated from the above-mentioned polymer electrolytic fuel cell and output through the first and second output lines into a DC voltage in an isolated manner and outputs it through the first and second common input lines; An energy storage device capable of charging or discharging power through a battery; A bidirectional DC/DC converter connected between the energy storage device and the first and second common input lines to convert DC voltage in both directions; A solar panel that generates power from incident sunlight; An MPPT converter connected between the solar cell panel and the first and second common input lines, and controlled by maximum power point tracking for the power output from the solar cell panel; A DAB converter configured to boost power input through the first and second common input lines and output it through the first and second common output lines; A bidirectional single-phase inverter capable of converting the DC voltage output through the first and second common output lines of the above DAB converter into an AC voltage and supplying it to the grid power supply; A control unit that receives a first output voltage and a first output current of the polymer electrolyte fuel cell, a second output voltage and a second output current of the energy storage device, a third output voltage and a third output current of the solar panel, and a fourth output voltage and a fourth output current of the bidirectional single-phase inverter, and controls the operation of the isolated DC/DC converter, the bidirectional DC/DC converter, the MPPT converter, the DAB converter, and the bidirectional single-phase inverter; The above MPPT converter 11th and 12th switch elements, each having one end connected to the first and second common input lines respectively and the other end connected in series to each other through the 6th series connection line, and turned on or off by the control unit; A second inductor, one end of which is connected to the sixth series connection line and the other end of which is connected to the fifth output line of the solar cell panel; and A household power integrated control system using a PEMFC, characterized by having a third capacitor connected between the other end of the second inductor and the eleventh switch element.
2. A household power integrated control system applying a PEMFC, characterized in that, in claim 1, the control unit controls the operation of the isolated DC/DC converter, the bidirectional DC/DC converter, the MPPT converter, the DAB converter, and the bidirectional single-phase inverter according to power adjustment information received from the power management server via a communication network.
3. A household power integrated control system applying a PEMFC according to paragraph 2, wherein the control unit determines whether power can be supplied from the solar panel when it receives a signal from the power management server to supply charging power to the grid power through the communication unit, and if it is determined that power can be supplied from the solar panel, it controls the power generated from the solar panel to be supplied to the grid power, and if it is determined that power cannot be supplied from the solar panel, it controls the power charged in the energy storage device to be supplied to the grid power.
4. In paragraph 1, the isolated DC/DC converter First and second switch elements, each having one end connected to a first and second output line through which power generated from the polymer electrolyte fuel cell is output, and the other end connected in series with each other via a first series connection line, and turned on or off by the control unit; A third and fourth switch element, each having one end connected to the first and second output lines respectively and the other end connected in series with respect to the first and second switch elements, which are turned on or turned off by the control unit and connected in parallel with respect to the first and second switch elements; A fifth and sixth switch element, each having one end connected to the first and second common input lines respectively and the other end connected in series to each other through a third series connection line, and turned on or off by the control unit; A seventh and eighth switch element, each having one end connected to the first and second common input lines respectively and the other end connected in series with respect to the fifth and sixth switch elements, which are turned on or turned off by the control unit; A first coil having one end connected to the first series connection line and the other end connected to the second series connection line; A second coil coupled to the first coil, with one end connected to the third series connection line and the other end connected to the fourth series connection line; comprising A household power integrated control system using a PEMFC, characterized in that a first capacitor is connected between the first common input line and the second common input line.
5. In paragraph 4, the above-mentioned bidirectional DC/DC converter A ninth and tenth switch element, each having one end connected to the third and fourth output lines of the energy storage device and the other end connected in series with each other through a fifth series connection line, and turned on or off by the control unit; A household power integrated control system using a PEMFC, characterized by having a first inductor connected to the fifth series connection line at one end and connected to the first common input line at the other end.

Description

Home Power Total Control System Using PEMFC The present invention relates to a household power integrated control system using a PEMFC, and more specifically, to a household power integrated control system using a PEMFC that supports bidirectional power supply and charging with a grid power source. An Energy Storage System (ESS) is a system that stores energy for later use. By using an ESS, it is possible to efficiently handle fluctuations in power consumption over time and to provide stable power in the event of voltage drops caused by sudden accidents. Such ESS is an assembly of batteries for energy storage, and has a battery cell and a module including a plurality of cells as the basic constituent unit. In addition, ESS stores excess power produced and allows it to be transmitted and used when there is a temporary shortage of power. Recently, there has been active development of systems that combine a solar power generation device and an ESS to store electricity generated by solar power and use it for various loads, and various proposals have been made, such as domestic registered patent No. 10-1871237. Meanwhile, recently, there has been a steady demand for a structure that expands beyond solar power generation devices to include fuel cells capable of generating electricity, enabling small-scale power consumers such as households to increase their self-supply capabilities while facilitating easy power control with the grid. FIG. 1 is a block diagram showing a household power integrated control system applying a PEMFC according to the present invention, and Figure 2 is a detailed circuit diagram according to an example of a household power integrated control system applying the PEMFC of Figure 1. Hereinafter, a household power integrated control system applying a PEMFC according to a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings. FIG. 1 is a block diagram showing a household power integrated control system with a PEMFC according to the present invention, and FIG. 2 is a detailed circuit diagram according to an example of a household power integrated control system with a PEMFC according to FIG. 1. Referring to FIGS. 1 and 2, the power integrated control system (100) according to the present invention comprises a polymer electrolyte fuel cell (102), an isolated DC/DC converter (110), an energy storage device (104), a bidirectional DC/DC converter (130), a solar panel (106), an MPPT converter (140), a DAB converter (150), a bidirectional single-phase inverter (170), and a control unit (190). Polymer Electrolyte Membrane Fuel Cells (PEMFC) (102) are configured to generate electricity by electrochemically reacting a fuel gas containing hydrogen and an oxidant gas containing oxygen. The polymer electrolyte fuel cell (102) consists of a polymer electrolyte membrane that selectively transports hydrogen ions and an anode and a cathode formed on both sides of the polymer electrolyte membrane. The detailed structure is disclosed in various forms, such as Korean Registered Patent No. 10-0938948 and Korean Published Patent No. 10-2006-0098240, so a detailed description is omitted. These polymer electrolyte fuel cells offer excellent output characteristics, low operating temperatures, and fast start-up and response capabilities. Furthermore, since they can use hydrogen produced by reforming methanol, ethanol, or natural gas as fuel, they have the advantage of a wide range of applications, including mobile power sources, distributed power sources for homes and public buildings, and small power sources for electronic devices. The isolated DC/DC converter (110) converts power generated from the polymer electrolytic fuel cell (102) and output through the first and second output lines (102a) (102b) into an isolated DC voltage and outputs it through the first and second common input lines (150a) (150b). The isolated DC/DC converter (110) is equipped with first to eighth switch elements (Q1 to Q8) and first and second coils (111) (112). The first and second switch elements (Q1)(Q2) each have one end connected to the first and second output lines (102a)(102b) through which power generated from the polymer electrolyte fuel cell (102) is output, and the other end is connected in series with each other through the first series connection line (S1) and is turned on or turned off by the control unit (190). The third and fourth switch elements (Q3)(Q4) each have one end connected to the first and second output lines (102a)(102b) and the other end connected in series through the second series connection line (S2), and are turned on or turned off by the control unit (190), and are connected in parallel with respect to the first and second switch elements (Q1)(Q2). One end of each of the 5th and 6th switch elements (Q5)(Q6) is connected to the 1st and 2nd common input lines (150a)(150b) separated from the 1st and 2nd output lines (102a)(102b), and the other end