TW201318297A - Energy storage system in microgrid for mode transfer - Google Patents
Energy storage system in microgrid for mode transfer Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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本發明是有關於一種微電網儲能系統模式切換裝置，尤指一種可利用儲能系統與靜態開關之連動，當儲能系統進行控制模式切換時，該靜態開關係則同時動作，而達到以快速切換之方式使微電網進行併網運轉模式或孤島運轉模式之功效者。The invention relates to a micro-grid energy storage system mode switching device, in particular to a combination of an energy storage system and a static switch. When the energy storage system performs a control mode switching, the static open relationship simultaneously acts to achieve The fast switching mode enables the micro grid to perform the functions of the grid-connected operation mode or the island operation mode.
按，能源危機與環境考量等因素，再生能源的研究在近幾年來蓬勃發展，不斷地改善發電效率並降低設置成本。According to factors such as energy crisis and environmental considerations, research on renewable energy has flourished in recent years, continuously improving power generation efficiency and reducing installation costs.
然而，眾多的再生能源如何整合已成為一個重要的課題；目前研究趨向使用微電網(Microgrid)的架構來整合再生能源(如太陽能、風力發電等等)、備用電力以及儲能系統(Energy Storage System,ESS)，以期能達到穩定區域電壓和提升再生能源滲透率的目的。However, how to integrate many renewable energy sources has become an important issue; current research tends to use the microgrid architecture to integrate renewable energy (such as solar energy, wind power, etc.), backup power, and energy storage systems (Energy Storage System). , ESS), in order to achieve the purpose of stabilizing regional voltage and increasing the permeability of renewable energy.
微電網具有兩種操作模式，分別是併網模式與孤島運轉模式，其主要差異在於市電是否與微電網連接。當微電網由併網模式切換至孤島運轉模式時，必須有設備接替市電的角色，於切換期間，穩定微電網電壓，使負載端不受影響。否則負載端可能因電壓驟降造成跳脫或故障。此外，於孤島運轉模式下，再生能源發電量與負載需求必不平衡，多餘或缺少的功率必須有設備來加以調節。當微電網由孤島運轉模式欲重新與市電併聯時，因微電網電壓與市電電壓必有振幅大小、相位及頻率的差異，切換至併網模式前，必須先調整微電網電壓與市電電壓同步，才可進行模式切換。The microgrid has two modes of operation, namely, grid-connected mode and island-connected mode. The main difference is whether the mains is connected to the micro-grid. When the microgrid is switched from the grid-connected mode to the islanding mode, the device must take over the role of the mains. During the switching, the microgrid voltage is stabilized and the load is not affected. Otherwise, the load terminal may trip or malfunction due to a sudden voltage drop. In addition, in the island operation mode, the amount of renewable energy generated and the load demand must be unbalanced, and the excess or lack of power must be adjusted by equipment. When the microgrid is to be reconnected with the mains in the island operation mode, the microgrid voltage and the mains voltage must have different amplitude, phase and frequency. Before switching to the grid-connected mode, the microgrid voltage must be synchronized with the mains voltage. Mode switching is possible.
有鑑於此，本案之發明人特針對前述習用發明問題深入探討，並藉由多年從事相關產業之研發與製造經驗，積極尋求解決之道，經過長期努力之研究與發展，終於成功的開發出本發明「微電網儲能系統模式切換裝置」，可控制儲能電池的充、放電，於孤島運轉模式時，因微電網與市電脫離，故微電網本身須有一電壓控制設備穩定內部電壓，因此，儲能系統此時需操作於電壓模式，其餘再生能源控制方式不變；當再生能源發電量大於負載時，儲能系統必須將多餘的電量回充至儲能電池，故於模式切換期間，儲能系統必須快速切換控制模式，使微電網能夠持續穩定運轉，藉以改善習用之種種問題。In view of this, the inventors of this case have intensively discussed the above-mentioned problems of conventional inventions, and actively pursued solutions through years of experience in R&D and manufacturing of related industries. After long-term efforts in research and development, they finally succeeded in developing this book. Invented the "microgrid energy storage system mode switching device", which can control the charging and discharging of the energy storage battery. In the island operation mode, since the micro grid is separated from the mains, the microgrid itself must have a voltage control device to stabilize the internal voltage. The energy storage system needs to operate in the voltage mode at this time, and the rest of the renewable energy control mode is unchanged; when the regenerative energy generation amount is greater than the load, the energy storage system must recharge the excess electricity to the energy storage battery, so during the mode switching, the storage The system must quickly switch the control mode so that the microgrid can continue to operate stably, so as to improve the problems of the conventional use.
本發明之主要目的係在於，可利用儲能系統與靜態開關之連動，當儲能系統進行控制模式切換時，該靜態開關係則同時動作，而達到以快速切換之方式使微電網進行併網運轉模式或孤島運轉模式之功效。The main purpose of the present invention is to utilize the linkage between the energy storage system and the static switch. When the energy storage system performs the control mode switching, the static open relationship operates at the same time, and the microgrid is connected to the network in a fast switching manner. The function of the operation mode or the island operation mode.
為達上述之目的，本發明係一種微電網儲能系統模式切換裝置其包含有：一能源管理系統；一與能源管理系統連接之儲能系統；一與能源管理系統連接之微渦輪機；一與能源管理系統連接之可控負載；一與能源管理系統及儲能系統連接之靜態開關；以及至少一與儲能系統、微渦輪機、可控負載及靜態開關連接之再生能源。For the above purposes, the present invention is a microgrid energy storage system mode switching device comprising: an energy management system; an energy storage system connected to the energy management system; and a micro turbine connected to the energy management system; A controllable load connected to the energy management system; a static switch connected to the energy management system and the energy storage system; and at least one renewable energy source connected to the energy storage system, the micro turbine, the controllable load, and the static switch.
於本發明之一實施例中，該儲能系統係透過RS485通訊介面與能源管理系統連接。In an embodiment of the invention, the energy storage system is connected to the energy management system via an RS485 communication interface.
於本發明之一實施例中，該儲能系統係包含有一與能源管理系統連接連接之併網運轉模式、一與併網運轉模式連接之切換開關，一與切換開關連接之充/放電電流控制器、一與充/放電電流控制器連接之PWM模組、一與PWM模組連接之功率開關、一與靜態開關連接之電壓控制器、及一連接切換開關、充/放電電流控制器與電壓控制器之孤島運轉模式。In an embodiment of the present invention, the energy storage system includes a grid-connected operation mode connected to the energy management system, a switch connected to the grid-connected operation mode, and a charge/discharge current control connected to the switch. a PWM module connected to the charge/discharge current controller, a power switch connected to the PWM module, a voltage controller connected to the static switch, and a connection switch, a charge/discharge current controller and a voltage The island's island operation mode.
於本發明之一實施例中，該微渦輪機係透過RS485通訊介面與能源管理系統連接。In an embodiment of the invention, the microturbine is coupled to the energy management system via an RS485 communication interface.
於本發明之一實施例中，該可控負載係透過RS485通訊介面與能源管理系統連接。In an embodiment of the invention, the controllable load is connected to the energy management system via the RS485 communication interface.
於本發明之一實施例中，該可控負載係包含有純電阻負載及電感性負載。In an embodiment of the invention, the controllable load comprises a purely resistive load and an inductive load.
於本發明之一實施例中，該靜態開關係透過RS485通訊介面與能源管理系統連接。In an embodiment of the invention, the static open relationship is connected to the energy management system via the RS485 communication interface.
於本發明之一實施例中，該靜態開關更可進一步與市電連接。In an embodiment of the invention, the static switch can be further connected to the mains.
於本發明之一實施例中，該再生能源係可為太陽能發電系統或風力發電系統。In an embodiment of the invention, the renewable energy source may be a solar power generation system or a wind power generation system.
請參閱『第1及第2圖』所示，係分別為本發明之組成架構示意圖及本發明之切換狀態示意圖。如圖所示：本發明係一種微電網儲能系統模式切換裝置，其至少包含有一能源管理系統1、一儲能系統2、一微渦輪機3、一可控負載4、一靜態開關5以及至少一再生能源6所構成。Please refer to the "1st and 2nd drawings" for a schematic diagram of the composition of the present invention and a schematic diagram of the switching state of the present invention. As shown in the figure: the present invention is a microgrid energy storage system mode switching device, which at least includes an energy management system 1, an energy storage system 2, a micro turbine 3, a controllable load 4, a static switch 5, and at least A renewable energy 6 is composed.
上述所提之能源管理系統1係可監控儲能系統2、微渦輪機3、可控負載4及靜態開關5，並且計算微電網內部的功率流向，當微電網整體需轉換模式或是必要性停機等作用時，送出相關訊號。The above-mentioned energy management system 1 can monitor the energy storage system 2, the micro-turbine 3, the controllable load 4 and the static switch 5, and calculate the power flow direction inside the micro-grid, when the micro-grid needs to be switched overall or necessary to stop When the effect is equal, the relevant signal is sent.
該儲能系統2係透過RS485通訊介面20與能源管理系統1連接，可提供能量或是吸收再生能源多餘的發電量，因此，功率流向是雙向的，而該儲能系統2係包含有一與能源管理系統1連接連接之併網運轉模式21、一與併網運轉模式21連接之切換開關22，一與切換開關22連接之充/放電電流控制器23、一與充/放電電流控制器23連接之PWM模組24、一與PWM模組24連接之功率開關25、一與靜態開關5連接之電壓控制器26、及一連接切換開關22、充/放電電流控制器23與電壓控制器26之孤島運轉模式27，可由能源管理系統1設定併網運轉模式21或孤島運轉模式27，當進行運轉模式切換時，係同時下達命令給靜態開關5。The energy storage system 2 is connected to the energy management system 1 through the RS485 communication interface 20, and can provide energy or absorb excess power generation of the renewable energy. Therefore, the power flow direction is bidirectional, and the energy storage system 2 includes an energy source. The management system 1 is connected to the connected grid operation mode 21, a switch 22 connected to the grid operation mode 21, a charge/discharge current controller 23 connected to the switch 22, and a charge/discharge current controller 23. The PWM module 24, a power switch 25 connected to the PWM module 24, a voltage controller 26 connected to the static switch 5, and a connection switch 22, a charge/discharge current controller 23 and a voltage controller 26 In the island operation mode 27, the grid operation mode 21 or the island operation mode 27 can be set by the energy management system 1, and when the operation mode is switched, the command is given to the static switch 5 at the same time.
該微渦輪機3係透過RS485通訊介面30與能源管理系統1連接，可作為備用電力而於微電網進行孤島運轉模式27時產生運作。The microturbine 3 is connected to the energy management system 1 via the RS485 communication interface 30, and can be operated as backup power when the microgrid performs the island operation mode 27.
該可控負載4係透過RS485通訊介面40與能源管理系統1連接，而該可控負載4係包含有純電阻負載41及電感性負載42，係用於模擬微電網用戶的用電特性，可讓能源管理系統1藉由RS485通訊介面40下達負載啟動之指令。The controllable load 4 is connected to the energy management system 1 through the RS485 communication interface 40, and the controllable load 4 includes a purely resistive load 41 and an inductive load 42 for simulating the electrical characteristics of the microgrid user. Let the energy management system 1 issue a load start command through the RS485 communication interface 40.
該靜態開關5係透過RS485通訊介面50與能源管理系統1及儲能系統2連接，而該靜態開關5更可進一步與市電7連接，可由外部訊號控制其閉合或斷開，且該靜態開關5亦可監測市電7與微電網交流匯流排之電壓大小、頻率，並透過RS485通訊介面50將數據回傳給能源管理系統1。The static switch 5 is connected to the energy management system 1 and the energy storage system 2 through the RS485 communication interface 50, and the static switch 5 can be further connected to the commercial power 7, and can be controlled to be closed or disconnected by an external signal, and the static switch 5 is The voltage and frequency of the AC bus 7 and the microgrid AC bus can also be monitored, and the data is transmitted back to the energy management system 1 through the RS485 communication interface 50.
該再生能源6係與儲能系統2、微渦輪機3、可控負載4及靜態開關5連接，而該再生能源6係可為太陽能發電系統61或風力發電系統62，而當進行併網運轉模式21之操作時，可將產生之電力輸出電流注入微電網中。The regenerative energy 6 is connected to the energy storage system 2, the micro turbine 3, the controllable load 4, and the static switch 5, and the regenerative energy 6 can be the solar power generation system 61 or the wind power generation system 62, and when the grid operation mode is performed When the operation of 21, the generated power output current can be injected into the micro grid.
當本發明於，微電網進行全黑啟動時，該儲能系統2以電壓控制器26建立微電網內部電壓及頻率，此時，微電網係為孤島運轉模式27，而儲能系統2根據市電7之電壓狀態微調電網電壓，一旦電壓同步後，則由能源管理系統1命令靜態開關5投入，並將自身切換至充/放電電流控制器23，讓儲能系統2於電流控制模式下對儲能電池進行充、放電之動作，而如何動作則由能源管理系統1之設定方式進行。When the present invention is used, the micro-grid performs full black start, the energy storage system 2 establishes the internal voltage and frequency of the micro-grid by the voltage controller 26, at this time, the micro-grid is the island operation mode 27, and the energy storage system 2 is based on the mains supply. The voltage state of 7 fine-tunes the grid voltage. Once the voltage is synchronized, the energy management system 1 commands the static switch 5 to input, and switches itself to the charge/discharge current controller 23, so that the energy storage system 2 stores in the current control mode. The battery can be charged and discharged, and the operation is performed by the energy management system 1.
另當微電網於併網運轉模式21時，偵測到市電7故障後，此時，儲能系統2必須快速反應，命令靜態開關5跳脫，由切換開關22切換至電壓控制器26以維持微電網內部電壓；於孤島運轉模式27下，根據再生能源6發電量與負載需量，使儲能系統2自動偵測電壓變化趨勢決定是否充、放電，尤以再生能源6發電量大於負載需量時，儲能系統2除維持微電網電壓之外，必須吸收多餘的發電量加以儲存，否則微電網電壓可能不斷上升，造成設備損壞；一旦偵測到市電7恢復後，該儲能系統2將再次調整電壓及頻率與市電7同步，再重新併入市電7呈併網運轉模式21。In addition, when the microgrid is in the grid-connected operation mode 21, after detecting the mains 7 fault, at this time, the energy storage system 2 must respond quickly, commanding the static switch 5 to trip, and the switch 22 is switched to the voltage controller 26 to maintain The internal voltage of the microgrid; in the island operation mode 27, according to the regenerative energy 6 power generation and load demand, the energy storage system 2 automatically detects the voltage change trend to determine whether to charge or discharge, especially the regenerative energy 6 power generation is greater than the load In addition to the maintenance of the microgrid voltage, the energy storage system 2 must absorb excess power generation for storage, otherwise the microgrid voltage may rise continuously, causing equipment damage; once the mains 7 is detected, the energy storage system 2 The voltage and frequency will be adjusted again in synchronization with the mains 7, and then reintegrated into the mains 7 in the grid-connected operation mode 21.
而該儲能系統2模式利用切換開關22進行切換時，該切換開關22由能源管理系統1命令控制，以選擇併網運轉模式21或孤島運轉模式27對應之電流作切換，可於孤島運轉模式27下，使電壓控制器26用於控制三相交流輸出電壓，藉由交流額定電壓設定值以及電壓回授值計算出對應的電流命令，而於併網運轉模式21下，該電流命令係直接由能源管理系統1設定且該充/放電電流控制器23，而回授三相電感電流，並依據電流命令大小及正負號產生PWM的控制訊號給PWM模組24，以決定功率開關25之切換模式；所以。When the energy storage system 2 mode is switched by the switch 22, the switch 22 is commanded and controlled by the energy management system 1 to select the current corresponding to the grid operation mode 21 or the island operation mode 27 for switching, and can be used in the island operation mode. 27, the voltage controller 26 is used to control the three-phase AC output voltage, and the corresponding current command is calculated by the AC rated voltage set value and the voltage feedback value, and in the grid-connected operation mode 21, the current command is directly The charge/discharge current controller 23 is set by the energy management system 1, and the three-phase inductor current is fed back, and the PWM control signal is generated according to the current command size and the positive and negative signs to the PWM module 24 to determine the switching of the power switch 25. Mode; so.
該充/放電電流控制器23在併網運轉模式21下，電流命令由能源管理系統1提供，孤島運轉模式27時則由電壓控制器26產生電流命令，而達到快速模式切換之目的，因此可使本發明於模式切換時僅透過改變電流命令的來源就可實現。如此，可使本發明至少達到下列之優點：The charge/discharge current controller 23 is in the grid-connected operation mode 21, and the current command is provided by the energy management system 1. When the island operation mode 27 is generated, the voltage controller 26 generates a current command to achieve the purpose of fast mode switching. The invention can be implemented only by changing the source of the current command during mode switching. Thus, the present invention can at least achieve the following advantages:
1. 儲能系統2與靜態開關5連動，根據命令進行模式切換：1. The energy storage system 2 is linked with the static switch 5, and the mode is switched according to the command:
(A)併網運轉模式21切換至孤島運轉模式27時，儲能系統2延續市電7電壓，穩定孤島運轉模式27時的電壓及頻率。(A) When the grid-connected operation mode 21 is switched to the island operation mode 27, the energy storage system 2 continues the voltage of the commercial power supply 7 and stabilizes the voltage and frequency at the time of the island operation mode 27.
(B)孤島運轉模式27切換至併網運轉模式21時，先進行微電網內部電壓與市電7電壓同步確認，待同步後再投入靜態開關5完成併網動作。(B) When the island operation mode 27 is switched to the grid-connected operation mode 21, the internal voltage of the micro-grid and the voltage of the commercial power supply 7 are synchronously confirmed, and after being synchronized, the static switch 5 is input to complete the grid-connecting operation.
2. 在孤島運轉模式27下，當再生能源6發電量低於使用量時，儲能系統2放電提供能量，若再生能源6發電量高於使用量時，儲能系統2將多餘之能量回充至電池以穩定微電網電壓。2. In the island operation mode 27, when the amount of power generated by the renewable energy source 6 is lower than the usage amount, the energy storage system 2 discharges to provide energy. If the amount of power generated by the renewable energy source 6 is higher than the usage amount, the energy storage system 2 will return excess energy. Charge the battery to stabilize the microgrid voltage.
綜上所述，本發明微電網儲能系統模式切換裝置可有效改善習用之種種缺點，可利用儲能系統與靜態開關之連動，當儲能系統進行控制模式切換時，該靜態開關係則同時動作，而達到以快速切換之方式使微電網進行併網運轉模式或孤島運轉模式之功效；進而使本發明之產生能更進步、更實用、更符合消費者使用之所須，確已符合發明專利申請之要件，爰依法提出專利申請。In summary, the micro-grid energy storage system mode switching device of the present invention can effectively improve various disadvantages of the conventional use, and can utilize the linkage between the energy storage system and the static switch. When the energy storage system performs the control mode switching, the static open relationship is simultaneously Action, and achieve the effect of making the grid-connected operation mode or the island operation mode of the micro-grid in a fast switching manner; thereby making the invention more progressive, more practical, and more in line with the needs of the consumer, indeed conforming to the invention For the requirements of the patent application, the patent application is filed according to law.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍；故，凡依本發明申請專利範圍及發明說明書內容所作之簡單的等效變化與修飾，皆應仍屬本發明專利涵蓋之範圍內。However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of the invention patent.
1．．．能源管理系統1. . . Energy management system
2．．．儲能系統2. . . Energy storage system
20、30、40、50．．．RS485通訊介面20, 30, 40, 50. . . RS485 communication interface
21．．．併網運轉模式twenty one. . . Grid operation mode
22．．．切換開關twenty two. . . Toggle switch
23．．．充/放電電流控制器twenty three. . . Charge/discharge current controller
24．．．PWM模組twenty four. . . PWM module
25．．．功率開關25. . . Power switch
26．．．電壓控制器26. . . Voltage controller
27．．．孤島運轉模式27. . . Island operation mode
3．．．微渦輪機3. . . Micro turbine
4．．．可控負載4. . . Controllable load
41．．．純電阻負載41. . . Pure resistive load
42．．．電感性負載42. . . Inductive load
5．．．靜態開關5. . . Static switch
6．．．再生能源6. . . renewable energy
61．．．太陽能發電系統61. . . The Sun can generate system
62．．．風力發電系統62. . . Wind power system
7．．．市電7. . . Mains
第1圖，係本發明之組成架構示意圖。Figure 1 is a schematic diagram of the composition of the present invention.
第2圖，係本發明之切換狀態示意圖。Fig. 2 is a schematic diagram showing the switching state of the present invention.
1．．．能源管理系統1. . . Energy management system
2．．．儲能系統2. . . Energy storage system
20、30、40、50．．．RS485通訊介面20, 30, 40, 50. . . RS485 communication interface
3．．．微渦輪機3. . . Micro turbine
4．．．可控負載4. . . Controllable load
41．．．純電阻負載41. . . Pure resistive load
42．．．電感性負載42. . . Inductive load
5．．．靜態開關5. . . Static switch
6．．．再生能源6. . . renewable energy
61．．．太陽能發電系統61. . . The Sun can generate system
62．．．風力發電系統62. . . Wind power system
7．．．市電7. . . Mains
Claims (9)
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| TW100139186A TWI467881B (en) | 2011-10-27 | 2011-10-27 | Energy storage system in microgrid for mode transfer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015074417A1 (en) * | 2013-11-22 | 2015-05-28 | 国家电网公司 | System for starting large-scale power load in micro grid |
| TWI506920B (en) * | 2013-10-29 | 2015-11-01 | Inst Nuclear Energy Res Atomic Energy Council | Device of Mode-Switching Controller for Micro-Grid Current Converter |
| TWI559646B (en) * | 2014-11-10 | 2016-11-21 | Chunghwa Telecom Co Ltd | Hybrid energy regulation control method |
| US9620960B2 (en) | 2014-01-13 | 2017-04-11 | Abb Schweiz Ag | Control of a stabilizing energy storage in a microgrid |
| TWI736496B (en) * | 2020-12-30 | 2021-08-11 | 義守大學 | Power control method and power control system |
| TWI773372B (en) * | 2021-06-09 | 2022-08-01 | 談光雄 | Micro grid system and pre-synchronization estimation method |
| TWI805155B (en) * | 2021-06-30 | 2023-06-11 | 台達電子工業股份有限公司 | Power supply apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TW546886B (en) * | 2001-11-15 | 2003-08-11 | Ind Tech Res Inst | Central monitoring power quality control system |
| US7353083B2 (en) * | 2004-01-15 | 2008-04-01 | Vrb Power Systems Inc. | Vanadium redox battery energy storage and power generation system incorporating and optimizing diesel engine generators |
| TW200931751A (en) * | 2008-01-08 | 2009-07-16 | Wen-Yu Zhang | Island protective relaying system of grid-connected induction generators and detection method for island effect thereof |
| WO2010109262A2 (en) * | 2009-03-27 | 2010-09-30 | Clipper Windpower, Inc. | A redundant, supercapacitor, back-up power supply for wind turbine conversion and control systems |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI506920B (en) * | 2013-10-29 | 2015-11-01 | Inst Nuclear Energy Res Atomic Energy Council | Device of Mode-Switching Controller for Micro-Grid Current Converter |
| WO2015074417A1 (en) * | 2013-11-22 | 2015-05-28 | 国家电网公司 | System for starting large-scale power load in micro grid |
| US9882385B2 (en) | 2013-11-22 | 2018-01-30 | State Grid Hebei Electric Power Research Institute | System for starting large-scale power load in micro-grid |
| US9620960B2 (en) | 2014-01-13 | 2017-04-11 | Abb Schweiz Ag | Control of a stabilizing energy storage in a microgrid |
| TWI559646B (en) * | 2014-11-10 | 2016-11-21 | Chunghwa Telecom Co Ltd | Hybrid energy regulation control method |
| TWI736496B (en) * | 2020-12-30 | 2021-08-11 | 義守大學 | Power control method and power control system |
| TWI773372B (en) * | 2021-06-09 | 2022-08-01 | 談光雄 | Micro grid system and pre-synchronization estimation method |
| TWI805155B (en) * | 2021-06-30 | 2023-06-11 | 台達電子工業股份有限公司 | Power supply apparatus |
| US11728675B2 (en) | 2021-06-30 | 2023-08-15 | Delta Electronics, Inc. | Power supply apparatus |
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