TW202326576A - Method of power distribution for auxiliary service with microgrid - Google Patents

Abstract

A method is provided for energy distribution. Distributed power generation is integrated with microgrid for auxiliary services. It analyzes distributed power sources in the microgrid for device capacities, response time, and duration. The characteristics and advantages of each distributed power source are used. Based on the power demand and duration of the auxiliary services, corresponding strategy tables are established for energy distribution coordination. Correspondingly, the distributed power sources, such as supercapacitors, lithium batteries, micro-turbines, and diesel engines, are corresponded one by one to provide auxiliary services of backup and transfer for quick response, frequency modulation, instant response, and supplementary, etc. In the present invention, the power output required by the various auxiliary services, as compared with traditional use of generator sets, makes better use of the characteristics of distributed power resources and has better scheduling flexibility, too. Thus, the present invention cooperates with the microgrid and distribution network to distribute and combine power sources in the microgrid through the proposed method to output various auxiliary services for the distribution network and assist the system in stabilizing power supply.

Description

Energy Distribution Method for Ancillary Services in Microgrids

The invention relates to an energy distribution method for providing auxiliary services with a microgrid, especially Refers to an energy distribution method that uses micro-grids to integrate distributed power generation to provide auxiliary services, especially refers to the use of distributed power sources such as supercapacitors, lithium batteries, micro-turbines, and diesel engines in micro-grids to provide auxiliary services to help stabilize power distribution Network voltage and frequency.

Auxiliary service is a kind of short-term standby capacity, which is used in the stability of the power system It is a series of services required to maintain the safe and stable operation of the power system in real-time power dispatch, or restore the system to a normal state after an accident to ensure stable power supply and meet voltage and frequency requirements. In response to a large amount of intermittent renewable energy being connected to the grid, in addition to relying on the power of traditional generators to meet the load demand in the power system, the auxiliary services provided by the micro-grid can improve the stability and reliability of the power system and make the power system balance under dynamic conditions , especially as the proportion of renewable energy power generation increases, it can assist the power system to stabilize power supply, so it is important.

In different power markets, due to power structure, grid structure, load distribution and load Depending on the characteristics, the types and timing of auxiliary services required are also different. Traditionally, auxiliary services are mainly provided by generator sets, but in recent years, demand response and energy storage systems have been added to provide auxiliary services. However, the above-mentioned auxiliary service provision method does not make good use of the distributed power generation that has gradually increased in recent years. However, it cannot directly provide auxiliary services with distributed power generation, because the characteristics of each distributed power generation are different, and the response time, The duration etc. are also different.

In view of the current government of the Republic of China has set a policy of 20% of renewable energy power generation by 2025 With the large amount of intermittent renewable energy connected to the grid, when a disturbance or accident occurs in the distribution network, the dispatching of the distribution network will be more difficult. For this reason, with the increasing popularity of distributed power sources, microgrids and other related power generation sources and systems, the provision of auxiliary services has become a hot topic. , can have more flexible use of space. Therefore, it is necessary to develop a set of inventions that can solve the technical shortcomings of the previous case and satisfy the auxiliary services required after the distribution network encounters an accident.

The main purpose of the present invention is to overcome the above-mentioned problems encountered in the prior art and provide Provides an energy distribution method that integrates distributed power generation with a microgrid to provide auxiliary services.

Another object of the present invention is to provide a micro-grid internal super capacitor, lithium battery Distributed power sources such as pools, micro-turbines, and diesel engines provide auxiliary services, and can make good use of the characteristics of each distributed power source to help stabilize the voltage and frequency of the distribution network. Compared with traditional auxiliary service resources, micro-grids provide auxiliary services. Energy distribution methods for services.

To achieve the above purpose, the present invention is an energy distribution system that provides auxiliary services with a microgrid. The distribution method at least includes the following steps: Step 1: According to the power demand and duration of several distributed power sources in the microgrid, obtain the output operation status of each distributed power source, wherein each distributed power source is a supercapacitor (Supercapacitor , SC), lithium battery, microturbine and diesel engine; and Step 2: The microgrid establishes an energy coordination allocation strategy table according to the power demand and duration of each distributed power supply, and correspondingly uses the supercapacitor, The lithium battery, the micro-turbine, and the diesel engine provide one-by-one correspondence with quick-response standby auxiliary services, frequency modulation standby auxiliary services, instant standby auxiliary services, and supplementary standby auxiliary services to help stabilize the voltage and frequency of the distribution network; , the quick-response backup auxiliary service has a fast response time and a short duration requirement, and the supercapacitor corresponds to the output; the frequency modulation backup auxiliary service has a slightly longer response time and duration than the quick response backup auxiliary service, and the Lithium battery corresponds to the output; the instant backup auxiliary service is within 10 minutes of response time and lasts for more than 1 hour, and the micro turbine corresponds to the output; and the supplementary backup auxiliary service is within 30 minutes of response time and duration of 2 to 4 Hours or more, the corresponding output of the diesel engine.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand If the requirement is within 50 kW, and the duration is within 10 seconds, the supercapacitor is used to provide the quick-response standby auxiliary service.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand It is required to be between 50-200 kW, and the duration is within 10 seconds, and the supercapacitor (full) and the lithium battery (remaining) are used to provide the quick-response backup auxiliary service.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand If it is within 200 kW, and the duration is between 11 seconds and 1 minute, the lithium battery is used to provide the FM backup auxiliary service.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand If it is within 100 kW, and the duration is between 1 minute and 1 hour, use the lithium battery to provide the FM backup auxiliary service.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand It is required that the lithium battery and the micro-turbine are used to provide the frequency modulation backup auxiliary service between 100-200 kW, and the duration is between 1 minute and 1 hour.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand The requirement is within 150 kW, and the duration is between 1 and 2 hours, and the instant standby auxiliary service is provided by the micro turbine.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand It is required that the microturbine and the diesel engine provide the instant standby auxiliary service between 150-200 kW, and the duration is between 1-2 hours.

In the above-mentioned embodiments of the present invention, in the energy coordination allocation strategy table, according to the power demand If the requirement is within 200 kW, and the duration is between 2 and 4 hours, the supplementary backup auxiliary service is provided by the diesel engine.

Please refer to "Figure 1 and Figure 2", which are respectively the flow of energy distribution in the present invention Schematic diagram of the process, and a schematic diagram of the energy distribution provided by the microgrid to provide auxiliary services in the present invention. As shown in the figure: the present invention is an energy distribution method for providing auxiliary services with a microgrid, which at least includes the following steps: Step s1: According to the power demand and duration of several distributed power sources in the microgrid, obtain the output operation status of each distributed power source, where each distributed power source is a supercapacitor (Supercapacitor, SC), lithium battery, microturbine and diesel engines. Step s2: According to the power demand and duration of each of the distributed power sources, the microgrid correspondingly establishes an energy coordination distribution strategy table, and corresponds to the supercapacitor, the lithium battery, the microturbine, and the diesel engine one by one Provide rapid response backup auxiliary service, frequency regulation backup auxiliary service, instant backup auxiliary service, and supplementary backup auxiliary service to help stabilize the voltage and frequency of the distribution network. If so, the process disclosed above constitutes a brand-new energy distribution method that provides auxiliary services through microgrids.

The innovation of the present invention lies in that, according to different auxiliary service requirements, each with different characteristics The decentralized power supply is provided accordingly. When in use, the above-mentioned quick-response backup auxiliary service has a fast response time and a short duration requirement, and the super capacitor corresponds to the output; the above-mentioned frequency modulation backup auxiliary service has a slightly longer response time and duration than the quick-response backup auxiliary service. Lithium battery corresponds to the output; the above-mentioned instant backup auxiliary service has a response time of 10 minutes and a duration of more than 1 hour, which is suitable for the corresponding output of the micro-turbine; And the above-mentioned supplementary transfer auxiliary service is within 30 minutes of response time and lasts for more than 2 to 4 hours, which is suitable for Output corresponding to diesel engine.

In one embodiment, the present invention uses distributed power sources such as supercapacitors, lithium batteries, microturbines, and diesel engines to provide auxiliary services one by one, as shown in FIG. 2 . The strategy flow of this method is: the output operation status of each distributed power source in the microgrid depends on the two indicators of power demand and required duration, and the microgrid receives instructions and outputs auxiliary services to assist in stabilizing the voltage of the distribution network, frequency. Table 1 summarizes the microgrid energy coordination and distribution strategy table. Table I power requirement duration Within 10 seconds 11th second ~ 1 minute 1 minute ~ 1 hour 1 ~ 2 hours 2 ~4 hours Within 50kW Super Capacitor SC lithium battery lithium battery microturbine diesel engine 50~100 kW SC (full) + lithium battery (remaining) lithium battery lithium battery microturbine diesel engine 100~150 kW SC (full) + lithium battery (remaining) lithium battery Lithium battery + micro turbine microturbine diesel engine 150~200 kW SC (full) + lithium battery (remaining) lithium battery Lithium battery + micro turbine Micro turbine + diesel engine diesel engine

In the above energy coordinated distribution strategy table, according to the power demand within 50 kW, and keep If the duration is within 10 seconds, supercapacitors are used to provide quick-response backup auxiliary services; according to power requirements between 50 and 200 kW, and the duration is within 10 seconds, supercapacitors (full) and lithium batteries (remaining) are used to provide Quick response backup auxiliary service.

In the above energy coordinated distribution strategy table, according to the power demand within 200 kW, and keep When the duration is between 11 seconds and 1 minute, lithium batteries are used to provide FM backup auxiliary services; according to power requirements within 100 kW, and the duration is between 1 minute and 1 hour, lithium batteries are used to provide FM backup services Auxiliary service: According to the power demand between 100-200 kW, and the duration is between 1 minute and 1 hour, the frequency modulation backup auxiliary service is provided by lithium batteries and micro-turbines.

In the above energy coordinated distribution strategy table, according to the power demand within 150 kW, and keep The duration is between 1 and 2 hours, and the microturbine is used to provide instant standby auxiliary service; according to the power demand, the power demand is between 150 and 200 kW, and the duration is between 1 and 2 hours, the microturbine and diesel engine are used to provide instant backup. Transfer to ancillary services.

In the above energy coordinated distribution strategy table, according to the power demand within 200 kW, and keep The duration is between 2 and 4 hours, and the diesel engine is used to provide supplementary standby auxiliary service.

In summary, the architecture of the present invention is based on the microgrid: supercapacitor, lithium battery, microvortex Distributed power sources such as turbines and diesel engines are provided one by one according to the energy coordination and distribution strategy table of the microgrid (ie, Table 1): quick response backup, frequency modulation backup, instant backup, and supplementary backup auxiliary services. The present invention uses a microgrid to integrate distributed power generation to provide auxiliary services, which is a brand new method pioneered in Taiwan.

The present invention integrates distributed power generation with a microgrid to provide auxiliary services The source allocation method can analyze the device capacity, response time, and duration of each distributed power source in the microgrid, make good use of the different characteristics and advantages of each distributed power source, and establish energy coordination accordingly according to the power demand and duration of auxiliary services Allocation strategy table, and correspondingly use distributed power sources such as super capacitors, lithium batteries, micro turbines, and diesel engines to provide quick response backup auxiliary services, frequency modulation auxiliary transfer services, instant backup auxiliary services, and supplementary backup transfers Ancillary services and other ancillary services require power output. Compared with traditional ancillary service resources, generator sets are used to provide ancillary services, which can make better use of the characteristics of distributed power sources, and the scheduling flexibility is also better than traditional generators. In this way, the present invention cooperates with the microgrid and the distribution network, dispatches and combines the distributed power sources in the microgrid through the proposed energy distribution method, and outputs various auxiliary services, which can provide auxiliary services for the distribution network and assist the system to stabilize power supply.

In summary, the present invention is an energy distribution method that provides auxiliary services with microgrids. This method can effectively improve the various shortcomings of conventional use, and provide auxiliary services with decentralized power sources such as supercapacitors, lithium batteries, micro turbines, and diesel engines in the microgrid. It can make good use of the characteristics of each distributed power source to help stabilize the power distribution network. Voltage and frequency are more flexible than traditional auxiliary service resources, which makes the production of this invention more advanced, more practical, and more in line with the needs of users.

However, what is described above is only a preferred embodiment of the present invention, and should not be limited thereto. The scope of the implementation of the present invention; therefore, all brief descriptions made according to the scope of patent application for the present invention and the content of the description of the invention Any single equivalent change and modification shall still fall within the scope covered by the patent of the present invention.

s1～s2: steps

Figure 1 is a schematic flow chart of the energy distribution of the present invention. Figure 2 is a schematic diagram of the energy distribution of the present invention to provide auxiliary services with the microgrid.

s1~s2: steps

Claims (9)

An energy distribution method for providing auxiliary services through a microgrid, which at least includes the following steps: Step 1: According to the power demand and duration of several distributed power sources in the microgrid, obtain the output operation status of each distributed power source, where each distributed power source is a supercapacitor (Supercapacitor, SC), lithium battery, micro turbine and diesel engines; and Step 2: According to the power demand and duration of each of the distributed power sources, the micro-grid correspondingly establishes an energy coordination distribution strategy table, and correspondingly corresponds to the supercapacitor, the lithium battery, the micro-turbine, and the diesel engine one by one Provide rapid response backup auxiliary services, frequency modulation backup auxiliary services, instant backup auxiliary services, and supplementary backup auxiliary services to help stabilize the voltage and frequency of the distribution network; among them, The quick-response backup auxiliary service has a fast response time and a short duration requirement, and the super capacitor corresponds to the output; the frequency modulation backup auxiliary service has a response time and duration slightly longer than the quick response backup auxiliary service, and the lithium battery The corresponding output of the pool; the instant backup auxiliary service is within 10 minutes of response time and the duration is more than 1 hour, and the corresponding output of the micro turbine; and the supplementary backup auxiliary service is within 30 minutes of response time and the duration of 2 to 4 hours Above, output correspondingly with this diesel engine. According to the energy distribution method for providing auxiliary services through the microgrid as described in item 1 of the scope of the patent application, in the energy coordination distribution strategy table, according to the power demand is within 50 kW, and the duration is within 10 seconds, and The supercapacitor provides the fast-response backup auxiliary service. The energy distribution method for providing auxiliary services by microgrid according to item 1 of the scope of the patent application, wherein, in the coordinated energy distribution strategy table, the power demand is between 50 and 200 kW, and the duration is 10 seconds Within this period, the supercapacitor (full) and the lithium battery (remaining) are used to provide the quick-response backup auxiliary service. According to item 1 of the patent application, the energy source that provides auxiliary services through microgrid The allocation method, wherein, according to the energy coordination allocation strategy table, the power demand is within 200 kW, and the duration is between 11 seconds and 1 minute, and the lithium battery is used to provide the frequency modulation backup auxiliary service. The energy distribution method for providing auxiliary services through microgrids according to item 1 of the patent application, wherein, in the energy coordination distribution strategy table, according to the power demand is within 100 kW, and the duration is between 1 minute and 1 Hours, the lithium battery is used to provide the FM backup auxiliary service. According to the energy distribution method of microgrid providing auxiliary services as described in item 1 of the patent application, wherein, in the energy coordination distribution strategy table, the power demand is between 100 and 200 kW, and the duration is in the first From one minute to one hour, the lithium battery and the micro-turbine are used to provide the frequency modulation backup auxiliary service. According to the energy distribution method for providing auxiliary services through microgrids as described in item 1 of the patent application, wherein, in the energy coordination distribution strategy table, according to the power demand is within 150 kW, and the duration is within 1 to 2 hours During this time, the microturbine is used to provide the instant standby auxiliary service. According to the energy distribution method of microgrid providing auxiliary services described in item 1 of the patent application, wherein, in the energy coordinated distribution strategy table, the power demand is between 150-200 kW, and the duration is between 1-200 kW. Within 2 hours, the instant standby auxiliary service is provided by the micro-turbine and the diesel engine. According to the energy distribution method for providing auxiliary services through the microgrid as described in item 1 of the patent application, wherein, in the energy coordinated distribution strategy table, according to the power demand is within 200 kW, and the duration is within 2 to 4 hours During the period, the diesel engine is used to provide the supplementary standby auxiliary service.