1239131 玖、發明說明： 【發明所屬之技術領域】 本發明係為一種分散式發電系統之獨立運轉偵測方法 及其系統，特別是關於一種利用小波轉換（Wavelet Transform)原理偵測分散式發電系統是否形成獨立運轉之 孤島區域(Independent Power Island)的方法及其系統。 【先前技術】 按，電力產業自由化是政府新定政策，亦是電力發展 的未來趨勢，小型的分散式發電系統，諸如汽電共生發電 系統、太陽能發電系統及風力發電系統等，併入配電系統 運轉亦必將為未來電力自由化發展之方向。 然而將分散式發電系統併入市電網路系統運轉，必將 對電力系統造成運轉及控制上之影響，諸如對配電系統電 力品質影響、獨立運轉現發生之可能性，以及電力系統穩 定度等等。 其中尤以分散式發電系統併入公用電力網路後，所可 能引發之獨立運轉現象，對於電力系統安全性及穩定性， 更可能造成極大威脅。如第一圖所示，係為傳統分散式發 電系統之配電架構示意圖，在此種配電模式中，當市電網 路系統100之分流斷路器101開路時，分散式發電系統DG1 、DG2、DG3卻仍處於受電狀態，即形成不受電力公司掌 控之電力孤島區域110。 關鍵在於分散式發電系統常屬私人擁有，並不受電力 1239131 公司直接控制，因此當電力公司因故供電中斷時，各分散 式發電系統並未能檢知，且未能即時切離市電網路系統100 ，而造成部份配電系統呈單獨運轉供電之現象，如未在事 前以縝密規劃，即有可能擴大事件影響範圍，造成嚴重損 害。 該分散式發電系統獨立運轉現象常發生於其發電量總 和與配電系統的用電負載相當接近的時刻，而此現象將可 能造成下列不利之影響： 1. 因電力孤島區域仍維持受電卻未被檢出，有可能造 成相關區域維修人員之忽略，因而危害工安。 2. 影響配電系統自動復閉動作時序。 3. 獨立運轉現象期間，電壓、頻率不穩定，亦即倘若 孤島區域内分散式發電系統的發電量低於總用電量時，則 系統電壓與頻率將出下降的趨勢。 因此先進國家之電力法規中均已規定：當市電網路系 統故障或停電時，分散式發電系統應即時與市電網路系統 解聯，避免市電網路系統呈現異常充電狀態。 然而使用傳統的電壓頻率型保護電驛，會因市電中斷 時，分散式發電系統仍持續並聯供電，以致配電系統上的 電壓、頻率變動範圍並不顯著，若配電系統内有電動機負 載，則電壓頻率的變化範圍更加不明顯，而不足以觸發傳 統的保護電驛，使分路斷路器無法與市電解聯的誤動作現 象。 目前分散式發電系統之獨立運轉現象係朝向發展電力 1239131 系統參數監測技術，以建構獨立運轉現象轉用之保護電驛 ，進而解決傳統電壓頻率型電驛的偵測死角問題，包含被 動型與主動型偵測法兩類。 被動型偵測法如相位變化偵測及頻率移偵測等，以偵 測系統參數變化來判別獨立運轉事故之發生，具有低安裝 成本之優點，但獨立受電區域内之配電系統的電力供給量 與需求量差距為供給量的1 〇%内時，無法正確檢知獨立運 轉現象的發生。 主動型偵測法則有偵測頻率變化及實功率變化等，係 在發電系統的輸出端加入一微量的小擾動，當系統正常時 ，市電網路系統足夠強健，此小擾動不會造成任何影響， 反之，一旦市電中斷後，此小擾動會引起頻率或電壓的大 幅變化，因此可協助分散式發電系統即時解聯，然而若併 入之市電網路系統的分散式發電系統數目眾多時，將較難 掌握所加入小擾動信號之準霉性，甚至使系統供電不穩定 〇 職是，本案發明人即為解決上述現有分散式發電系統 偵測獨立運轉上所具有的不便與缺失，乃特潛心研究並配 合學理之運用，提出一種以被動型偵測技術為基礎，建構 一獨立運轉之檢測系統，以達到正確及快速檢知系統獨立 運轉之發生，是為一設計合理且能有效改善上述缺失之發 明。 【發明内容】 7 1239131 本發明之目的係提供一種分散式發電系統之獨立運轉 摘測方法及其系統，係利用小波轉換原理偵測分散式發電 系統是否形成獨立運轉之孤島區域，再解聯該分散式發電 系統之發電源，以達成防治獨立運轉現象發生的功效。 為達成上述目的，本發明係提供一種分散式發電系統 之獨立運轉偵測方法，該分散式發電系統中具有一發電源 ，藉由一第一分流斷路器並聯至一獨立配電系統，而該方 法首先讀取該獨立配電系統上之電壓信號或頻率信號，並 =小波轉換該電壓或頻率信號，以形成一時間—高頻成分視 窗及一時間-低頻成分視窗，便以偵測信號暫態時域上的擾 動t號，接著判斷南頻成分的絕對值是否大於一門限值， 且持續時間超過門限值，若是則表示發生獨立運轉現象， 立，產生一警示信號至該第一分流斷路器，驅動該第一分 流斷路器跳脫，以解聯該發電源與該配電系統。 較佳地，本發明提供一種分散式發電系統之獨立運轉 備測系統，包括-發電源、—第—分流斷路器…㈣頻 入裝置及-計算處理裝置，其中該第—分流斷路器係 連接於該發電源與麵立配㈣統之間，而該電壓頻率輸 入裝置連接於該獨立配電純上，用以輸人系統上之電魔 或頻率信餘該計算處縣置，輯算該㈣錢率信號 的„轉換，偵測該獨立配電系統是否發生獨立運轉現象 雷若是則控制該第-分流斷路器解聯該發電源與該獨立配 較k也纟么日月提供上述之散式發電系統之獨立運轉 1239131 偵測系統，其中該小波轉換係解析該電壓或頻率信號，或 兩者一併解析成一時間-高頻成分視窗及一時間-低頻成分 視窗，以觀察信號中的擾動信號。 較佳地，本發明提供上述之散式發電系統之獨立運轉 偵測系統，其中偵測獨立運轉現象之發生，係為偵測為小 波轉換後發生擾動信號的持續時間與高頻訊號絕對值均分 別大於兩者一門限值時。 【實施方式】 為了使貴審查委員能更進一步瞭解本發明為達成預 定目的所採取之技術、手段及功效，請參閱以下有關本發 明之詳細說明與附圖，相信本發明之目的、特徵與特點， 當可由此得一深入且具體之暸解，然而所附圖式僅提供參 考與說明用，並非用來對本發明加以限制者。 本發明係利用小波轉換(Wavelet Transform)的原理建 構一獨立運轉之偵測機制，使獨立運轉現象發生時，得以 即時檢測知並將分散式發電系統與配電系統解聯。 故首先針對小波轉換的原理作一簡單介紹，小波轉換 是將輸入的訊號進行一連串階層式的分解，而在任意階層 中所分解出的訊號即含有欲還原至上一階層訊號所需的重 要資訊，小波轉換具有時頻同時定位之特性，可利用一個 頻率視窗限制時域之寬度，再視高、低頻訊號自動變窄或 變寬，因此較能精確偵測信號之變化量。 如第二圖係為小波轉換之時間-頻率視窗示意圖，其中 1239131 包括一組時間-高頻信號之成分視窗201及一組時間-低頻 訊號之成分視窗202,而頻率成分視窗之中心高即為所欲偵 測信號的頻率範圍，而徑寬則代表單位時間内之解析度， 由圖可知小波轉換之頻寬與中心頻率比值為一定值，此即 意味小波轉換會根據所欲觀察之頻率高低，自動調整解析 度。由於目前已有許多有關於小波轉換之基本函數理論被 提出，而本發明僅為應用該小波轉換之基本函數以偵測電 力孤島運轉上，故其小波轉換之基本函數的理論推導就不 再詳細說明。 而如第三圖係為利用小波轉換作多頻分解之示意圖 。由前述可知小波轉換具有多層解析之特色，而小波轉換 的多層解析是將一電壓及頻率信號S[n]以一低通濾波器h[n] 及一高通濾波器g[n]分解成Ll[n]及Η1[η]兩組訊號，稱為第 一階小波轉換，接著再利用相同的方式將Ll[n]再分解成低 頻訊號L2[n]及高頻訊號H2[n]，此為第二階小波轉換，而 本發明中之訊號解析，係利用三階小波轉換，並考慮第一層濾波 即可。 如第四圖係為本發明分散式發電系統之獨立運轉偵 測系統架構示意圖。本發明之偵測系統10係架構於分散式 發電系統中之一發電源1後，而該發電源1係藉由一第一分 流斷路器11並聯於分散發電系統之獨立配電系統20上，再 藉由一第二分流斷路器21並聯於一市電網路系統30上。其 中該第二分流斷路器21係可由電力公司所控制，使該市電 網路系統30與獨立配電系統20解聯，而該第一分流斷路器 1239131 11則由本發明之偵測系統10所控制，用以解聯該發電源1 與該獨立配電系統20。 該偵測系統10中更設有一電壓頻率輸入裝置12及一 計算處理裝置13，其中該電壓頻率輸入裝置12可使用一比 流器121及一比壓器122連接於該獨立配電系統20上，用以 輸入該獨立配電系統20上之電壓信號或頻率信號至該計算 處理裝置13。 ， 而該計算處理裝置13内設有一微處理器，可用以計算 ‘ 該獨立配電系統20上之該電壓信號或頻率信號的小波轉換 鲁 ，以偵測出該獨立配電系統20是否發生獨立運轉之孤島現 象，如市電網路系統30故障或中斷供電，以便控制該第一 分流斷路器11跳脫，使該發電源1立即與該獨立配電系統20 解除並聯。 . 而本發明偵測及防治獨立運轉之流程示意圖如第五 圖所示。首先本發明讀取該獨立配電系統上之電壓信號或 頻率信號(301)後，即進行輸入信號的放大(302)，主要可放 大訊號之暫態，以利小波轉換後高頻成份的觀察，再以小 修 波轉換該電壓信號或頻率信號(303)，以偵測是否發生異常 . 狀況。 當電壓波形非屬正常時，小波轉換將因波形之暫態而 在時域上出現擾動的監測結果，且因小波轉換對瞬間不連 續之訊號變化具有良好的解析能力，即使頻率出現極微幅 之變化量，亦能將此變化量作有效呈現。 倘若該電壓信號發生擾動現象，或頻率信號發生擾動 11 1239131 現象’抑或兩者皆發生擾動現象時，且持續時間與高頻訊 號絕對值均分別大於兩者-門限值，即表*分散式發電系 統已發生獨立運轉現象，故須將分散式發電系·市電網 路系統解聯。而該門限值的設定是為了提升獨立運轉事件 判斷之精準度，且該Η限值可依據分散式發電系統的特性 予以適度調整。本發明較佳地時間門限值可設為〇.丨3秒， 而雨頻說號絕對值之門限值可設為〇 · 〇 1。 ^ 當該微處理H接收到電壓信號或頻率信鮮生擾動 時(304) ’立即進行獨立運轉之監測⑽），料動制時間 或高頻訊號絕對值兩者未大於該門限值時，則表示是其他 電力擾動現象(3G6)，但若擾動持續時間與高頻訊=對值 均分別大於兩者該門限值(307)，則發生獨立運轉^象，該 計算處理裝置赚生-警示信號至該第_分流斷路器^ 驅動該第一分流斷路器11跳脫’以解除該發電源與該配電 系統的並聯（308)。 ””以- 最後’測试本發明之彳貞測系統之可行性。在本於明之 所測試的分散式發電系統中，其額定電壓為丨丨〇伏特舍=$ 頻率為60Hz ’且電壓與頻率信號之每秒取樣點數為”⑼點 如第六圖（a)及(b)係為本發明測試市電系統跳脫時，獨 立配電系統區域内發生有效功率不平衡之電屋與頻率信號 波形圖。假設在〇.〇5秒後發生獨立運轉事故，j^時電 頻率皆有下降的趨勢。其中在0.3333秒時，電^^減 至〇.915pu’頻率則下降至59.5Hz。惟這些㈣虎之改變均屬 12 12391311239131 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to an independent operation detection method and system for a decentralized power generation system, and more particularly, to a method for detecting a decentralized power generation system using a wavelet transform (Wavelet Transform) principle. Method and system for forming an independent power island area (Independent Power Island). [Previous technology] According to the press, the liberalization of the power industry is a new government policy and also the future trend of power development. Small-scale decentralized power generation systems, such as cogeneration systems, solar power systems, and wind power systems, are integrated into power distribution. The system operation will also be the direction of the future development of power liberalization. However, the integration of the decentralized generation system into the mains network system operation will inevitably affect the operation and control of the power system, such as the impact on the power quality of the distribution system, the possibility of independent operation now occurring, and the stability of the power system. Among them, the decentralized power generation system, especially when it is incorporated into the public power network, may cause independent operation, which may pose a great threat to the safety and stability of the power system. As shown in the first figure, it is a schematic diagram of the power distribution architecture of a traditional distributed power generation system. In this power distribution mode, when the shunt circuit breaker 101 of the mains network system 100 is open, the distributed power generation systems DG1, DG2, and DG3 are It is still in a power receiving state, that is, an electric island area 110 that is not under the control of the power company is formed. The key is that distributed generation systems are often privately owned and not directly controlled by the power company 1239131. Therefore, when the power company's power supply is interrupted for any reason, each distributed generation system is not detected and it cannot be immediately disconnected from the mains network. System 100, and the phenomenon that part of the power distribution system is operating independently to supply power. If you do not plan carefully beforehand, it may expand the scope of the incident and cause serious damage. The phenomenon of independent operation of the decentralized power generation system often occurs when the total amount of power generation is very close to the power load of the power distribution system, and this phenomenon may cause the following adverse effects: 1. Because the island of power is still receiving electricity, it is not affected. Detection may cause neglect of maintenance personnel in the relevant area and thus endanger work safety. 2. Affects the sequence of automatic closing of the power distribution system. 3. During the period of independent operation, the voltage and frequency are unstable, that is, if the power generation of the distributed generation system in the island area is lower than the total power consumption, the system voltage and frequency will decrease. Therefore, the power regulations of advanced countries have stipulated that when the mains network system fails or fails, the distributed generation system should be disconnected from the mains network system immediately to prevent the mains network system from showing abnormal charging status. However, using the traditional voltage-frequency protection relay station, when the mains power is interrupted, the distributed generation system continues to supply power in parallel, so that the voltage and frequency range of the distribution system is not significant. If there is a motor load in the distribution system, the voltage The frequency change range is even less obvious, and it is not enough to trigger the traditional protection relay, which makes the shunt breaker unable to malfunction with the city electrolytic coupling. At present, the independent operation phenomenon of decentralized power generation systems is toward the development of power 1239131 system parameter monitoring technology to build protection relays that are converted to independent operation phenomena, thereby solving the problem of detecting dead corners of traditional voltage-frequency relays, including passive and active. There are two types of detection methods. Passive detection methods, such as phase change detection and frequency shift detection, detect the change of system parameters to determine the occurrence of independent operation accidents. It has the advantage of low installation cost, but the power supply of the power distribution system in the independent power receiving area When the gap between the demand and the supply is within 10% of the supply, the occurrence of independent operation cannot be accurately detected. Active detection rules include detection of frequency changes and real power changes. A small amount of small disturbance is added to the output of the power generation system. When the system is normal, the mains network system is strong enough. This small disturbance will not cause any impact. On the contrary, once the mains is interrupted, this small disturbance will cause a large change in frequency or voltage, so it can help the decentralized power generation system to disconnect immediately. However, if the number of decentralized power generation systems incorporated in the mains network system is large, it will It is difficult to grasp the quasi-mildness of the added small disturbance signal and even make the power supply of the system unstable. The inventor of this case is dedicated to solving the inconveniences and defects in the independent operation of the existing distributed power generation system described above. Research and cooperate with the application of science to propose a construction of an independent operation detection system based on passive detection technology to achieve correct and rapid detection of the occurrence of independent operation of the system, which is a reasonable design and can effectively improve the above-mentioned defects Invention. [Summary of the Invention] 7 1239131 The purpose of the present invention is to provide an independent operation extraction method and system for a distributed power generation system, which uses the wavelet transform principle to detect whether the distributed power generation system forms an isolated island region and then unlinks the island. The power generation of the decentralized power generation system to achieve the effect of preventing and controlling independent operation. In order to achieve the above object, the present invention provides an independent operation detection method for a decentralized power generation system. The decentralized power generation system has a power source, and is connected in parallel to an independent power distribution system through a first shunt breaker. First read the voltage signal or frequency signal on the independent power distribution system, and transform the voltage or frequency signal with wavelet to form a time-high frequency component window and a time-low frequency component window. Perturbation t on the domain, and then determine whether the absolute value of the south frequency component is greater than a threshold value and the duration exceeds the threshold value. If it is, it indicates that an independent operation phenomenon has occurred, and a warning signal is generated to the first shunt circuit breaker. The first shunt breaker is driven to trip to disconnect the power source from the power distribution system. Preferably, the present invention provides an independent operation standby test system for a decentralized power generation system, including a power generation source, a first shunt circuit breaker, a frequency input device, and a calculation processing device, wherein the first shunt circuit breaker is connected Between the power source and the noodle distribution system, and the voltage and frequency input device is connected to the independent power distribution unit for inputting electric magic or frequency information on the human system, the calculation department should set it, and calculate the The conversion of the money rate signal to detect whether the independent power distribution system is operating independently. If it is, then the third shunt circuit breaker is disconnected to disconnect the power source from the independent power distribution system. Does the day and month provide the above-mentioned distributed power generation? The system operates independently of the 1239131 detection system, where the wavelet transform analyzes the voltage or frequency signal, or both, into a time-high frequency component window and a time-low frequency component window to observe the perturbation signal in the signal. Preferably, the present invention provides the above-mentioned independent operation detection system for the distributed power generation system, wherein the occurrence of the independent operation phenomenon is detected in order to detect that disturbance occurs after wavelet conversion. When both the duration of the signal and the absolute value of the high-frequency signal are greater than the two thresholds respectively. [Embodiment] In order to allow your review committee to further understand the technology, means and effects adopted by the present invention to achieve the intended purpose, please refer to The following detailed description of the present invention and the accompanying drawings, it is believed that the purpose, features and characteristics of the present invention can be obtained from this in-depth and specific understanding, but the drawings are provided for reference and illustration purposes only, and are not intended to be used to modify the present invention. Limiters. The present invention uses the principle of wavelet transform to construct an independent operation detection mechanism, so that when independent operation occurs, real-time detection can be known and the decentralized power generation system and the power distribution system can be disconnected. The principle of wavelet transformation is briefly introduced. Wavelet transformation is a series of hierarchical decomposition of the input signal, and the signal decomposed in any hierarchy contains important information needed to restore the signal to the previous hierarchy. Wavelet transformation has The characteristic of simultaneous time-frequency positioning can use a frequency window to limit the width of the time domain. Depending on whether the high and low frequency signals are automatically narrowed or widened, it is more accurate to detect the amount of change in the signal. For example, the second picture is a schematic diagram of the time-frequency window of wavelet conversion, where 1239131 includes a set of time-high frequency signals A component window 201 and a set of time-low frequency signal component windows 202. The center height of the frequency component window is the frequency range of the signal to be detected, and the path width represents the resolution in unit time. The wavelet transformation can be seen from the figure The ratio of the frequency bandwidth to the center frequency is a certain value, which means that the wavelet transform will automatically adjust the resolution according to the desired frequency. Since many basic function theory about wavelet transform have been proposed, the present invention only In order to apply the basic function of the wavelet transform to detect the operation of power islands, the theoretical derivation of the basic function of the wavelet transform will not be described in detail. The third picture is a schematic diagram of multi-frequency decomposition using wavelet transform. It can be seen from the foregoing that the wavelet transform has the characteristics of multi-layer analysis, and the multi-layer analysis of wavelet transform is to decompose a voltage and frequency signal S [n] into a low-pass filter h [n] and a high-pass filter g [n] into Ll The two sets of signals [n] and 两组 1 [η] are called the first-order wavelet transform, and then L1 [n] is decomposed into a low-frequency signal L2 [n] and a high-frequency signal H2 [n] in the same way. It is the second-order wavelet transform, and the signal analysis in the present invention uses the third-order wavelet transform and considers the first-layer filtering. For example, the fourth figure is a schematic diagram of the independent operation detection system architecture of the distributed power generation system of the present invention. The detection system 10 of the present invention is constructed after one of the distributed power generation systems 1 in the decentralized power generation system, and the power generation 1 is connected in parallel to the independent power distribution system 20 of the decentralized power generation system through a first shunt circuit breaker 11, and then A second shunt circuit breaker 21 is connected in parallel to a mains network system 30. The second shunt circuit breaker 21 can be controlled by a power company to disconnect the mains network system 30 from the independent power distribution system 20, and the first shunt circuit breaker 1239131 11 is controlled by the detection system 10 of the present invention. It is used to disconnect the power source 1 and the independent power distribution system 20. The detection system 10 is further provided with a voltage-frequency input device 12 and a calculation processing device 13. The voltage-frequency input device 12 can be connected to the independent power distribution system 20 by using a current ratior 121 and a voltage ratior 122. It is used to input a voltage signal or a frequency signal from the independent power distribution system 20 to the calculation processing device 13. A microprocessor is provided in the calculation processing device 13 to calculate the wavelet transform of the voltage signal or frequency signal on the independent power distribution system 20 to detect whether the independent power distribution system 20 is operating independently. An island phenomenon, such as the failure or interruption of power supply of the mains network system 30, in order to control the first shunt circuit breaker 11 to trip, so that the power source 1 is immediately disconnected from the independent power distribution system 20. The flow chart of the independent operation of detection and prevention of the present invention is shown in the fifth figure. First, the present invention reads the voltage signal or frequency signal (301) on the independent power distribution system, and then amplifies the input signal (302), which mainly amplifies the transient state of the signal to facilitate the observation of high-frequency components after wavelet transformation. The voltage signal or frequency signal (303) is converted by a small wave to detect whether an abnormal condition occurs. When the voltage waveform is not normal, the wavelet transform will have a monitoring result of the disturbance in the time domain due to the transient state of the waveform, and the wavelet transform has a good analysis ability for instantaneous discontinuous signal changes, even if the frequency appears extremely small. The amount of change can also be effectively presented. If the voltage signal is disturbed, or the frequency signal is disturbed 11 1239131 phenomenon, or both of them are disturbed, and the duration and the absolute value of the high-frequency signal are both greater than the two-threshold values, that is, the table * decentralized power generation The system has been operating independently, so it is necessary to disconnect the distributed generation system and the mains network system. The threshold value is set to improve the accuracy of the independent operation event judgment, and the threshold value can be adjusted appropriately according to the characteristics of the decentralized power generation system. In the present invention, a preferred time threshold can be set to 0.13 seconds, and the absolute value of the rain frequency indicator can be set to 0 · 〇1. ^ When the micro processor H receives a voltage signal or a frequency signal with fresh disturbances (304) 'Immediately monitor the independent operation ⑽), when neither the material control time nor the absolute value of the high-frequency signal exceeds the threshold, then It indicates that it is other electric disturbance phenomenon (3G6), but if the duration of disturbance and high-frequency signal = pair value are both greater than the threshold value (307) of both, independent operation will occur, the calculation processing device earns a warning signal Until the _th shunt circuit breaker ^ drives the first shunt circuit breaker 11 to trip 'to release the parallel connection of the power generation source and the power distribution system (308). "" -Finally 'tests the feasibility of the present invention. In the distributed power generation system tested by Ben Yuming, its rated voltage is 丨 丨 0 Voltsjo = $ 60Hz ', and the number of sampling points per second for voltage and frequency signals is “⑼”, as shown in Figure 6 (a). And (b) are waveform diagrams of an electric house and a frequency signal where an effective power imbalance occurs in the area of an independent power distribution system when the utility power system is tested in the present invention. Assume that an independent operation accident occurs after .05 seconds. The electric frequency has a downward trend. Among them, at 0.3333 seconds, the electric frequency is reduced to 0.915pu ', and the frequency is reduced to 59.5Hz. However, these changes are all 12 1239131.
職是，本發明確絲上述露之技術，提供-種迥 堪能提高整體之使用價值，又其 使用，誠已符合發明專利之要件 然不同於習知者的設計，堪能 申明剷未見於刊物或公開使用 ’爰依法提出發明專利申請。 惟，上述所揭露之圖式、說明，僅為本發明之實施例 而已凡精于此項技藝者當可依據上述之說明作其他種種 之改良’而這些改變仍屬於本發明之發明精神及以下所界 定之專利範圍中。 【圖式簡單說明】 (一）、圖式說明·· 第一圖係為傳統分散式發電系統之配電架構示意圖； 第二圖係為小波轉換之時間_頻率視窗示意圖； 第二圖係為利用小波轉換作多頻分解之示意圖； 第四圖係為本發明分散式發電系統之獨立運轉偵測 13 1239131 系統架構示意圖； 區域内之電壓 發明侦測獨立運轉之流程示意圖; 與頻率信二圖’·:，獨立配_ 頻率信號的 為利用小波轉換電壓及 (二）、主要部分之代表符號·· 市電網路系統 100 分流斷路器 101 分散式發電系統 DG1、DG2、DG3 電力孤島區域 110 高頻訊號之頻率視窗 201 低頻訊號之頻率視窗 202 發電源 1 偵測系統 10 第一分流斷路器 11 電壓頻率輸入裳置 12 比流器 121 比壓器 122 計算處理裝置 13 獨立配電系統 20 第二分流斷路器 21 市電網路系統 30The purpose of the present invention is to provide a technology that can improve the overall value of use, and its use, which has already met the requirements of the invention patent, is different from the design of the acquaintance, and can declare that the shovel has not been seen in the publication or Publicly use '爰 to file an invention patent application according to law. However, the drawings and descriptions disclosed above are only examples of the present invention. Those skilled in the art can make other improvements based on the above descriptions. These changes still belong to the spirit of the invention and the following. Within the scope of the defined patents. [Schematic description] (I). Schematic description ... The first diagram is a schematic diagram of the distribution structure of a traditional decentralized power generation system; the second diagram is a time_frequency window of a wavelet transform; the second diagram is a utilization diagram Schematic diagram of wavelet transform for multi-frequency decomposition; The fourth diagram is the schematic diagram of the independent operation detection of the distributed power generation system of the invention 13 1239131; the schematic diagram of the independent operation process of the voltage invention detection in the area; : Independently assigned _ The frequency signal is converted by the wavelet voltage and (two), the representative symbols of the main part. · Mains network system 100 Shunt circuit breaker 101 Decentralized power generation system DG1, DG2, DG3 Power island area 110 High-frequency signal Frequency window 201 Frequency window for low-frequency signals 202 Power source 1 Detection system 10 First shunt circuit breaker 11 Voltage frequency input switch 12 Current transformer 121 Voltage regulator 122 Calculation processing device 13 Independent power distribution system 20 Second current breaker 21 Mains network system 30