TWM495032U - Micro-grid system with energy accumulation - Google Patents

Abstract

Micro-grid system with energy storage function including a renewable energy device, a rechargeable battery device, a micro-grid and a management device is provided. The renewable energy device provides renewable power. The rechargeable battery device stores charging power or provides discharging power. The management device is coupled to the renewable energy device, rechargeable battery device and the micro-grid. The micro-grid receives auxiliary power and city power, and provides driving power to a first load. The management device receives and converts at least one of the renewable power and the discharging power according to at least one of the renewable power, the state of charge (SOC) of the rechargeable battery device and the driving power to provide at least one of the auxiliary power and the charging power.

Description

Energy storage microgrid system

This creation is about a microgrid system, especially a microgrid system with energy storage.

Global warming is the most serious environmental problem facing all mankind. The increase in surface temperature is mostly caused by greenhouse gases emitted by human activities. Moreover, the depletion of traditional petrochemical energy and the environmental pollution caused by its use have brought great crisis to the sustainable survival of mankind. Therefore, in the case of limited petrochemical energy and global warming, it is imperative to reduce the consumption of non-renewable energy.

In view of this, the present invention provides an energy storage microgrid system that receives regenerative power provided by renewable energy and generates an auxiliary power to an external load according to the regenerative power to reduce the amount of utility power. Furthermore, when the renewable energy is at the peak of power generation, the energy storage microgrid system of the present invention stores excess power, and when the power consumption of the external load increases, the power is stored in parallel with the mains, and the power is supplied to the external load.

To achieve the above object, the energy storage microgrid system of the present invention comprises a regenerative energy device, a rechargeable battery device, a microgrid, and a management device. The renewable energy device provides a regenerative power. Rechargeable battery device to store a charge Electricity, or provide a discharge of electricity. The management device is coupled to the regenerative energy device, the rechargeable battery device, and the microgrid. The microgrid receives an auxiliary power and a mains supply and provides a driving power to a first load. The management device receives and converts at least one of the regenerative electric power and the discharged electric power according to at least one of the regenerative electric power, the charging capacity of the rechargeable battery device, and the driving electric power to provide at least one of the auxiliary electric power and the electric charging electric power.

In order to make the features and advantages of the present invention more comprehensible, the preferred embodiments are described below, and the detailed description is as follows:

100‧‧‧ Energy Storage Microgrid System

102‧‧‧Renewable energy installation

104‧‧‧Rechargeable battery unit

106‧‧‧Power Company

108‧‧‧Microgrid

110‧‧‧Management device

112, 114‧‧‧ load

202‧‧‧Power Converter

204‧‧‧Energy Manager

212, 214, 216, 218‧ ‧ converters

S _C1 ~ S _C4 ‧‧‧ control signal

Regenerative power P _RN ‧‧‧

Charge power P _CH ‧‧‧

P _DCH ‧‧‧Discharge power

P _AC ‧‧‧Power

P _AX ‧‧‧Auxiliary power

P _DR , P _UD ‧‧‧ drive power

SOC‧‧‧Charging capacity

VA ₁ , VA ₂ ‧‧‧ capacity value

The first picture is a schematic diagram of the energy storage microgrid system of the present invention.

Figure 2 is a schematic diagram of one possible embodiment of the management device of the creation.

3 and 4 are schematic views of possible actions of the authoring management apparatus 110.

The first picture is a schematic diagram of the energy storage microgrid system of the present invention. As shown, the energy storage microgrid system 100 includes a renewable energy device 102, a rechargeable battery device 104, a power company 106, a microgrid 108, a management device 110, and loads 112 and 114. This creation does not limit the types of loads 112 and 114. In a possible embodiment, the load 112 is a communication base station, a cloud computing container center, a medical center, a radio station transmitting station, an electric vehicle charging station, or a household appliance. In another possible embodiment, the load 114 is an emergency load such as an emergency exit indicator, an uninterruptible power system, or an emergency lighting device. In other embodiments, the energy storage microgrid system 100 has only the load 112.

The regenerative energy device 102 provides a regenerative power P _RN based on the external regenerative energy. This creation does not limit the type of the renewable energy device 102. For example, the renewable energy device 102 can be a solar power generation system, a wind power generation system, or a hydroelectric power generation system. In the present embodiment, the regenerative power P _RN is continuous current power, but is not intended to limit the present creation. In other embodiments, the regenerative power P _RN is an alternating current power. For convenience of explanation, the following will take a solar power generation system as an example.

The rechargeable battery device 104 stores a charging power P _CH or provides a discharging power P _DCH . This creation does not limit the type of the rechargeable battery device 104. Any battery having a charging function can be used as the rechargeable battery device 104. In some embodiments, the rechargeable battery device 104 is comprised of a plurality of rechargeable batteries that may be connected in parallel or in series. In addition, the rechargeable battery device 104 has a power detector (not shown) for detecting the state of charge (SOC) of the rechargeable battery. In other embodiments, the rechargeable battery device 104 further has other detectors (not shown) for detecting the charging current, temperature and voltage of the battery.

The management device 110 is coupled to the regenerative energy device 102, the rechargeable battery device 104, and the microgrid 108. The microgrid 108 receives the mains P _AC and an auxiliary power P _AX from the utility company 106 and provides a drive power P _DR to the load 112. In the present embodiment, the management device 110 receives and converts at least one of the regenerative electric power P _RN and the electric discharge electric power P _{DCH based} on at least one of the regenerative electric power P _RN , the charging capacity of the rechargeable battery device 104 , and the driving electric power P _DR . At least one of the auxiliary power P _AX and the charging power P _CH is provided.

In the present embodiment, the management device 110 uses the regenerative energy as a basis for energy storage management. For example, when the power generation amount of the regenerative energy device 102 is greater than the power consumption of the load 112, the rechargeable battery device 104 is charged; when the power generation amount of the regenerative energy device 102 is less than the power consumption of the load 112, the rechargeable battery is not Device 104 is charging. In a possible embodiment, the management device 110 retrieves power from the rechargeable battery device 104 for providing auxiliary power P _AX with the regenerative energy device 102. Therefore, the use efficiency of the renewable energy device 102 can be increased. Moreover, during the low power price period, the management device 110 charges the rechargeable battery device 104 to reduce the cost of electricity. The principle of operation of the management device 110 will be described in detail later.

Figure 2 is a schematic diagram of one possible embodiment of the management device of the creation. As shown, the management device 110 includes a power converter 202 and an energy manager 204. The power converter 202 converts the received power and outputs the corresponding power according to the control signals S _C1 to S _C4 . In the present embodiment, power converter 202 includes converters 212, 214, 216, and 218.

The converter 212 converts the regenerative electric power P _RN according to the control signal S _C1 and supplies the converted result to the bus bar 220. In a possible embodiment, if the regenerative power P _RN is a DC power, the converter 212 is a DC/DC converter. In another possible embodiment, if the regenerative power P _RN is an alternating current power, the converter 212 is an AC/DC converter.

The converter 214 converts the power on the bus bar 220 into the charging power P _CH according to the control signal S _C2 , or draws the power of the rechargeable battery device 104 to obtain a discharging power P _DCH , and then converts the discharging power P _DCH , and The converted result is supplied to the bus bar 220. In a possible embodiment, the converter 214 is a bi-directional converter for converting the power of the bus bar 220 and the rechargeable battery device 104.

The converter 216 converts the power on the bus bar 220 into the auxiliary power P _AX or the commercial power P _AC according to the control signal S _C3 and supplies the converted result to the bus bar 220. In a possible embodiment, the converter 216 is a bidirectional power inverter for converting the power of the bus bar 220 from direct current to alternating current or converting the mains P _AC from alternating current to direct current.

The converter 218 converts the power on the bus bar 220 into the driving power P _UD according to the control signal S _C4 and supplies the driving power P _UD to the load 114. In the present embodiment, when the power company 106 is unable to provide the commercial power P _AC normally, the management device 110 provides the driving power P _UD to the load 114 for driving the emergency device.

This creation does not limit the type of converter 218. In a possible embodiment, if the load 114 is a DC load, the converter 218 is a DC/DC converter. In another possible embodiment, if the load 114 is an AC load, the converter 218 is a DC/AC converter.

The energy manager 204 generates control signals S _C1 ~ S _C4 for energy scheduling, and can increase the efficiency of regenerative energy use, reduce the cost of electricity, and provide emergency power. In other embodiments, the energy manager 204 generates control signals S _C1 ~S _C4 based on the detection signal S _DT . In a possible embodiment, the detection signal S _DT represents the state of the rechargeable battery device 104, such as the amount of charge, current, voltage, and/or temperature.

FIG. 3 is a schematic diagram of a possible action of the authoring management device 110. As shown in the figure, when the charge capacity SOC of the rechargeable battery device 104 is less than the capacity value VA ₁ , the management device 110 generates the charging power P _CH according to the regenerative power P _RN generated by the regenerative energy device (here, a solar power generation system is taken as an example). .

For example, on sunny or cloudy days, the regenerative power generated by the solar power system is sufficient to charge the battery. Therefore, the management device 110 converts the regenerative electric power P _RN generated by the solar power generation system to generate the charging electric power P _CH . However, at night, the power generation capability of the solar power generation system is weak, so the management device 110 does not convert the regenerative power P _RN . In a possible embodiment, the management device 110 stops generating the charging power P _CH . In another possible embodiment, the management device 110 converts the mains P _AC to generate the charging power P _CH .

In other embodiments, the management device 110 has a timer (not shown) for determining that the current time is a high or low price of electricity. When the regenerative power P _{RN is} less than a regeneration threshold, the management device 110 is configured to convert the mains P _AC to generate the charging power according to the count value of the timer. In another possible embodiment, the management device 110 does not provide the charging power P _CH if it is in the high electricity price period.

When the charging capacity SOC of the rechargeable battery device 104 is greater than the capacity value VA ₁ but smaller than the capacity value VA ₂ , the management device 110 generates the charging power P _CH and the auxiliary according to the state of use of the regenerative power P _RN and the load 112 generated by the solar power generation system. At least one of the power P _AX .

For example, on a sunny day, the solar power system is at a peak in power generation. When the regenerative power P _{RN is} sufficient to cope with the power required by the load 112, the management device 110 converts the regenerative power P _RN to generate the auxiliary power P _AX and the charging power P _CH . When the regenerative power P _RN is approximately equal to the power required by the load 112, the management device 110 generates only the auxiliary power P _AX without charging the rechargeable battery device 104. In this embodiment, since the regenerative power P _RN without conversion to generate a charging power P _CH, also charging power P _CH without conversion to generate auxiliary power, it can reduce the power converter twice, to avoid unnecessary energy loss.

When it is cloudy, the regenerative power P _RN generated by the solar power generation system is low, and therefore, the management device 110 converts the regenerative electric power P _RN to generate the charging electric power P _CH . At this time, if the load 112 is a heavy load, the management device 110 can extract the power of the rechargeable battery device 104 to obtain the discharged power P _DCH , and convert the discharged power P _DCH to generate the auxiliary power P _AX to the micro grid 108 . In other embodiments, the management device 110 does not draw power from the rechargeable battery device 104, but converts the regenerative power P _RN to generate the auxiliary power P _AX .

At night, the power generation capability of the solar power generation system is weak, so the management device 110 draws the power of the rechargeable battery device 104 to obtain the discharge power P _DCH and converts the discharge power P _DCH for generating the auxiliary power P _AX to the micro grid. 108. In other embodiments, the management device 110 may retrieve and convert the commercial power P _AC for generating the charging power P _CH during the low-cost electricity period.

When the charge capacity SOC of the rechargeable battery device 104 is greater than the capacity value V _A2 , the management device 110 generates the auxiliary power P _AX based on the regenerative power P _RN generated by the solar power generation system. For example, on sunny days and cloudy days, the management device 110 converts the regenerative power P _RN to generate the auxiliary power P _AX . At night, the power generation capability of the solar power generation system is weak and the amount of charge of the rechargeable battery device 104 is sufficient, so the management device 110 does not generate the charging power P _CH . In a possible embodiment, the management device 110 captures the discharged power P _{DCH of the} rechargeable battery device 104 and converts the discharged power P _DCH to generate the auxiliary power P _AX to reduce the demand of the commercial power.

FIG. 4 is another possible operational principle of the authoring management apparatus 110. In the present embodiment, when the regenerative energy device 102 is not generating a peak, the management device 110 performs the power flow direction adjustment according to the usage state of the load. For example, when the load 112 is lightly loaded (ie, the driving power P _{DR is} less than a predetermined value), the management device 110 stops providing the charging power P _CH . Even if the rechargeable battery device 104 has sufficient power, the management device 110 does not draw power from the rechargeable battery device 104. In a possible embodiment, the management device 110 only converts the regenerative power P _RN for generating the auxiliary power P _AX . At this time, the regenerative power is connected in parallel with the mains, and is supplied to the load 112 in synchronization with the commercial power. In other embodiments, the management device 110 does not convert the regenerative power P _RN .

When the load 112 is heavy (ie, the driving power P _{DR is} greater than a preset value), the management device 110 captures the power of the rechargeable battery device 104 and converts the discharged power P _DCH to generate the auxiliary power P _AX . In this example, the power of the battery is output to the microgrid through the mains grid-connected inverter, and the parallel power is supplied to the load 112 in synchronization with the commercial power.

In other embodiments, the management device 110 determines the allocation of power based on the status of the mains P _AC . For example, when the utility power is lost, the management device 110 initiates an independent power supply mode. In the independent power supply mode, power is supplied by the regenerative energy device 102 and/or the rechargeable battery device 104 as backup power. In a possible embodiment, the management device 110 converts the regenerative power P _RN and/or the discharged power P _DCH to generate the driving power P _UD to the load 114. In another possible embodiment, when the charging power SOC of the rechargeable battery device 104 is lower than 20%, the management device 110 converts only the regenerative electric power P _RN .

Since the management device is based on the availability of external renewable energy as the basis for energy storage management, the function of actively managing energy storage can be achieved. When the renewable energy is sufficient, the surplus renewable energy is stored to increase the efficiency of the use of renewable energy. Further, the management device performs energy scheduling based on the amount of power generation of the regenerative energy, the state of the rechargeable battery, the amount of power used by the load, and the state of the commercial power, thereby reducing the cost of power consumption and providing emergency power appropriately.

Although the present invention has been disclosed above in the preferred embodiment, it is not To limit the creation of this work, anyone with ordinary knowledge in the technical field can make some changes and refinements without departing from the spirit and scope of this creation. Therefore, the scope of protection of this creation should be attached to the scope of patent application. The definition is final.

100‧‧‧ Energy Storage Microgrid System

102‧‧‧Renewable energy installation

104‧‧‧Rechargeable battery unit

106‧‧‧Power Company

108‧‧‧Microgrid

110‧‧‧Management device

112, 114‧‧‧ load

P _RN ‧‧‧Renewable electricity

P _CH ‧‧‧Charging power

P _DCH ‧‧‧Discharge power

P _AC ‧‧‧Power

P _AX ‧‧‧Auxiliary power

Driving power P _DR ‧‧‧

Claims (10)

An energy storage microgrid system comprising: a regenerative energy device providing a regenerative power; a rechargeable battery device storing a charging power or providing a discharging power; a microgrid receiving an auxiliary power and a mains supply, and providing a The first driving power is supplied to a first load; a management device coupled to the regenerative energy device, the rechargeable battery device, and the microgrid, wherein the management device is based on the regenerative power, a charging capacity of the rechargeable battery device, and the first At least one of the driving power receives and converts at least one of the regenerative power and the discharged power to provide at least one of the auxiliary power and the charging power. The energy storage microgrid system of claim 1, wherein when the charging capacity of the rechargeable battery device is less than a first capacity value, the management device converts the regenerative power to generate the charging power. The energy storage microgrid system of claim 2, further comprising a timer, wherein when the regenerative power is less than a regeneration threshold, the management device converts the utility power according to the count value of the timer for This charging power is generated. The energy storage microgrid system of claim 1, wherein the management device converts the regenerative power when the charging capacity of the rechargeable battery device is greater than the first capacity value and less than a second capacity value. This auxiliary power is generated. An energy storage microgrid system as described in claim 4, wherein The management device further converts the regenerative power to generate the charging power. The energy storage microgrid system of claim 4, wherein the management device does not generate the charging power. The energy storage microgrid system of claim 1, wherein the management device generates the auxiliary according to the discharged power when the regenerative power is less than a regeneration threshold and the first driving power is greater than a predetermined value. electric power. The energy storage microgrid system of claim 7, wherein the management device stops generating the auxiliary power when the regenerative power is less than the regeneration threshold and the first driving power is not greater than the preset value Charging power. The energy storage microgrid system of claim 1, further comprising a second load, wherein the management device converts at least one of the regenerative power and the discharged power when the microgrid does not receive the utility power And generating a second driving power and providing the second driving power to the second load. The energy storage microgrid system of claim 9, wherein when the charging capacity of the rechargeable battery device is less than the first capacity value, the management device converts only the regenerative power to generate the second driving power. .