201102498 六、發明說明： 【發明所屬之技術領域】 本發明是關於風力發電裝置及其控制方法。 【先前技術】 先前，已知有利用自然能源的風力進行發電的風力發 電裝置。風力發電裝置會因伴隨著外氣溫度下降，空氣中 的過冷卻水滴或者水蒸氣等碰觸風車翼等產生凍結，而在 風車翼等產生著冰。例如：專利文獻1揭示有風力發電裝 置著冰檢測方法。 〔專利文獻1〕美國專利第7,086,8 3 4號公報說明書 【發明內容】 不過’著冰是多數傾向於運轉中產生在風車翼的前緣 部’如上述狀況時，即使風力施加在風車翼，但因爲不會 產生所期望的揚升力，所以風車翼就不會旋轉，無法執行 所期望的運轉。 然而’以往，若風力發電裝置啓動前就產生著冰時， 則不拘著冰程度比照運轉，因此風力發電裝置的啓動較費 時’產生所謂風力發電裝置作業效率降低的問題。 本發明是爲了解決上述問題所硏創的發明，以提供一 種能夠降低風車翼著冰原因造成之風力發電裝置停止時間 的風力發電裝置及其控制方法爲目的。 本發的第1形態是一種具備有風車翼著冰量檢測用 -5- 201102498 的著冰檢測手段’當上述著冰檢測手段所檢測出的著冰量 超過第1指定値時’就將運轉模式轉換成不執行發電的無 負載運轉模式’以上述無負載運轉模式的運轉狀態，利用 上述著冰檢測手段對著冰量進行檢測的風力發電裝置。 根據上述構成時’當著冰檢測手段所檢測出的風車翼 著冰量超過第1指定値時’就會轉換成無負載運轉模式， 於無負載運轉模式的運轉狀態下對著冰量進行檢測。 先前’若產生著冰就立刻停止運轉，因此，例如：停 止期爲長期間時’配備有風車的機器會冷卻，以致有再啓 動時需要頗久時間的問題。相對於此，本發明如以上所述 ’利用無負載運轉模式持續執行運轉，所以就能夠持續執 行暖機。如此一來’例如：在實施無負載運轉模式時若著 冰量減少，再開始運轉時，就能夠從機器已暖機的狀態再 度開始運轉’能夠縮短運轉再度開始的所需時間。 最好是於上述風力發電裝置以上述無負載運轉模式運 轉的狀態下，當上述著冰檢測手段所檢測出著冰量超過比 上述第1指定値還大的第2指定値時，就停止運轉。 根據上述構成時’當著冰量爲較第1指定値還大的第 2指定値以下時’執行無負載運轉模式的運轉，當著冰量 超過第2指定値時’就停止運轉。如此一來，例如：以第 2指定値設定爲風力發電裝置運轉障礙起因的著冰量臨界 値時’在未導致風力發電裝置運轉障礙的範圍內是能夠盡 可能持續執行無負載運轉模式的運轉，能夠增加從暖機狀 態執行運轉再度開始的機會。 -6- 201102498 最好是於上述風力發電裝置以上述無負載運轉模式運 轉的狀態下’當上述著冰檢測手段所檢測出著冰量低於被 設定成上述第1指定値以下的第3指定値時，就轉換成平 常運轉模式。 如上述，於以無負載運轉模式運轉的狀態下，當著冰 量低於被設定成上述第1指定値以下的第3指定値時，就 從無負載運轉模式轉換成平常運轉模式。如此一來，即使 是在著冰量一度成爲比第1指定値還大時，但因在著冰量 減少時就會恢復成平常運轉，所以就能夠防止風力發電裝 置作業效率降低。此外，藉由對從平常運轉要轉換成無負 載運轉的轉換條件和從無負載運轉要轉換成平常運轉的轉 換條件設有磁滯現象，能夠實現運轉控制的穩定性。 最好是於上述風力發電裝置以上述無負載運轉模式運 轉的狀態下，風車轉子的旋轉數設定成在風車轉子旋轉時 不會讓附著在風車翼的冰到達周圍的風力發電裝置。 如上述，於無負載運轉模式，風車轉子的旋轉數是設 定成不會讓附著在風車翼的冰到達周圍的風力發電裝置。 如此一來，就能夠防止附著在風車翼的冰飛散對周圍造成 的影響。 上述風力發電裝置的上述著冰檢測手段，也可構成爲 根據上述風車翼的物理特性檢測出著冰量。 如此一來，就能夠沿用既有裝置算出著冰量。此外， 物理特性，例如是變形等。 上述風力發電裝置的上述著冰檢測手段於運轉停止狀 201102498 態下無法檢測出著冰量時，最好是從風車的運轉停止時經 過指定期間後轉換成上述無負載運轉模式，以上述無負載 運轉模式的運轉狀態，利用上述著冰檢測手段對上述著冰 量進行檢測。 如上述，從運轉停止狀態經過指定期間後就開始執行 無負載運轉模式，能夠以無負載運轉模式運轉的同時對著 冰量進行檢測，因此能夠比先前以目視確認著冰後再啓動 的狀況還能夠降低運轉停止時間。 本發明的第2形態是一種對風車翼的著冰量進行檢測 ’當著冰a超過第1指定値時，將運轉模式轉換成不發 電運轉狀態的無負載運轉模式，以上述無負載運轉模式 的運轉狀態，對著冰量進行檢測之風力發電裝置的控制 方法。 根據本發明時，能夠達到降低風車翼著冰原因造成之 風力發電裝置停止時間的效果。 【ω施方式】 〔發明之最佳實施形態〕 以下，參照圖面對本發明相關的風力發電裝置一實施 形態進行說明。 第1圖是表示本實施形態相關的風力發電裝置1的槪 略構成圖。 風力發電裝置1，如第1圖所示，具有支柱2和設置 在支柱2上端的發動機艙3及可繞著大致水平之軸線旋轉 -8 - 201102498 地設置發動機艙3的旋翼頭4。旋翼頭4，安裝有繞著其 旋轉軸線呈放射狀的3片風車翼1 〇。如此一來，從旋翼頭 4的旋轉軸線方向碰觸到風車翼10的風力，就會轉換成可 使旋翼頭4繞著旋轉軸線的動力，使該動力經由設置在風 力發電裝置1的發電機轉換成電力能源。 此外’風力發電裝置1具備風車翼1 0著冰量檢測用 的著冰檢測部（著冰檢測手段）7，可對各風車翼1 〇的著 冰量進行檢測。本實施形態中，著冰檢測部7是於旋翼頭 4旋轉狀態，對各風車翼1 〇的著冰量進行檢測，其具備： 傳感部71和訊號處理部72。 傳感部71是設置在各風車翼10，可檢測出風車翼1〇 的變形，輸出至訊號處理部72。訊號處理部72是設置在 旋翼頭4內部等，可接收上述傳感部7 1的檢測結果，從 檢測結果算出各風車翼1 0的著冰量。 上述傳感部7 1及訊號處理部72是計測風車翼1 〇相 關載重用的裝置，其爲習知的裝置。例如：傳感部71是 可採用FBG( Fiber Bragg Grating)感測器。該FBG感測 器是一種根據反射光的波長變化讀取變形或熱造成之布拉 格格子其格子間隔變化的感測器。針對傳感部7 1 ( FBG ) 及訊號處理部72的變形算出技術是屬於習知技術（例如 ·· insensys 公司製製品編號 WIND-SPECC-006-5 )，因此 省略詳細說明使用該等技術之變形等的算出方法。 更具體地說，如第2圖所示，訊號處理部72具備訊 號受訊部73、著冰量算出部74及運轉模式轉換部75。 -9 - 201102498 訊號受訊部73是週期性對傳感部71送出光’從其反 射光檢測出波長的變化。訊號受訊部73是將其所檢測出 的波長資訊輸出至著冰量算出部74。 著冰量算出部74是根據從訊號受訊部73取得的波長 資訊算出風車翼1 〇的著冰量。例如：著冰量算出部74是 根據所取得的波長算出變形’接著根據該變形値算出風車 翼1 ο I!曲力矩，然後根據所算出的彎曲力矩算出著冰量 〇 著冰量算出部74是針對著冰量設有複數的臨界値， 執行著冰量是否超過臨界値的判定，將判定結果輸出至運 轉模式轉換部7 5。 此外，著冰量算出部74是對3個風車翼1 0分別執行 判定。 運轉模式轉換部7 5是根據著冰量算出部74的判定結 果轉換運轉模式。此外，最好是當至少其中一個風車翼10 的著冰S超過臨界値時，就轉換運轉模式。 另，所謂臨界値是指針對至少其中1個風車翼1 〇的 著冰量所設定的第1指定値及比第1指定値還大的第2指 定値等。此外’本K施形態中’第3指定値是使用和第1 指定値相等的値。 更具體地說’當判定爲至少其中1個風車翼的著 冰S超過第1指定値時，運轉模式轉換部75就將風力發 電裝置1的運轉模式轉換成無負載運轉模式。所謂無負載 運轉模式’例如是指不發電的運轉（無負載）狀態。此外 -10- 201102498 ，例如：第1指定値，最好是設定成雖然是檢測出有著冰 ’但是該著冰量屬於沒有必要停止運轉的著冰量。 另外’當在無負載運轉模式的運轉狀態下，至少其中 1個風車翼1 0的著冰量由著冰量算出部7 4判定爲第1指 定値以下時’運轉模式轉換部75是將風力發電裝置1的 運轉模式轉換成平常運轉模式。 此外’當在無負載運轉模式的運轉狀態下，至少其中 1個風車翼1 0的著冰量由著冰量算出部7 4判定爲超過第 2指定値時，運轉模式轉換部7 5是停止風力發電裝置1的 運轉。更具體地說，第2指定値是設定成比第1指定還大 的値。另外，以將會妨礙到風力發電裝置1運轉的冰量設 爲第2指定値爲佳。所謂會妨礙到風力發電裝置1運轉的 冰量是指不利於風力發電裝置1運轉的著冰量値。例如： 是指當支柱2下部的應力成爲比指定値還大時，或者是超 過軸承、增速機等的容許載重時等。 如上述，藉由另項設有停止風力發電裝置1運轉的著 冰量臨界値，當著冰量在比第1指定値還大的第2指定値 以下的範圍，以無負載運轉模式運轉，就能夠監視著冰的 狀態，當著冰的狀態減少時，就能夠迅速轉換成平常運轉 模式。 此外，從風車翼1 〇爲停止狀態要開始運轉時，風力 發電裝置1是轉換成無負載運轉模式，執行和上述相同的 臨界値判定。另，當因確認出著冰量比第2指定値還大， 以致停止風力發電裝置1的運轉時，以指定時間間隔對著 -11 - 201102498 冰S進行檢測，當確認出著冰量成爲第2指定値以 就再度開始無負載運轉模式。另，本實施形態所採 感部7 1，在轉子的旋轉爲停止狀態時無法檢測出著 因此當風力發電裝置1的運轉爲停止時，以指定時 使轉子旋轉，於該狀態下對著冰量進行檢測。 上述無負載運轉模式中，風車轉子的旋轉數是 當風車轉子旋轉時，可使附著在風車翼1 〇的冰飛 比到達周圍風力發電裝置1的距離還小的旋轉數。 地說’是算出某旋轉數（例如基於成爲不發電的運 ，所以是低的旋轉數）時風車翼10的速度，以可 出的速度下附著在前緣部份的冰飛散距離爲其與鄰 的風力發電裝置1之距離以下的條件設定旋轉數。 風車間的間隔爲1 9 0公尺時，轉子4的旋轉數是名 控制成6rpm。 其次’針對本實施形態相關風力發電裝置1的 依順序追加說明運轉中檢測出著冰時的作用和從運 狀態啓動時的作用。 首先’針對風力發電裝置1的運轉中檢測出著 作用，使用第3圖進行說明。 風力發電裝置1爲運轉中時，由著冰檢測部7 部71和訊號受訊部7 3對變形進行計測（步驟s A 1 計測結果會輸出至著冰算出部74。此外，於著冰 74 ’根據所計測出的變形算出附著在風車翼1 〇的 W i ’定期對著冰量W i是否超過第1指定値進行判 下時， 用的傳 冰量， 間間隔 設定成 散距離 更具體 轉狀態 使所算 近設置 例如： έ 1 rpm 作用， 轉停止 冰時的 的傳感 )，該 算出部 著冰量 定，於 -12- 201102498 運轉模式轉換部7 5轉換運轉模式（步驟S A 2 )。 當著冰量Wi未超過第1指定値時’就使風力發電裝 置1的運轉模式爲「平常運轉」模式。當判定爲著冰量 Wi超過第1指定値時’運轉模式轉換部75就將風力發電 裝置1的運轉模式轉換成「無負載運轉」模式（步驟SA4 )° 於無負載運轉模式運轉時’對著冰量Wi是否超過第 2指定値進行定期判定（步驟SA5 ) ’當超過第2指定値 時，表示著冰量Wi增加’因此就停止風力發電裝置1的 運轉（步驟S A 6 )。此外’當著冰量W i未超過第2指定 値時，就回到步驟S A 1，繼續進行著冰量Wi的計測。 接著，針對風力發電裝置1從運轉停止狀態啓動時的 作用，使用第3圖進行說明。 從著冰量Wi超過第2指定値使風力發電裝置1爲停 止的狀態，對是否經過指定時間（例如1小時）進行判定 (步驟SA7 )。當判定爲經過指定時間時，就以「無負載 運轉」模式開始運轉（步驟S A8 )，然後回到步驟S A 1， 繼續進行著冰量Wi的計測。此外，當未經過指定時間時 ，重覆對是否經過指定時間進行判定（步驟SA7 )。 如以上所說明的內容，根據本實施形態相關的風力發 電裝置1及其控制方法時，可根據從風車翼1 0所計測到 的變形算出附著在風車翼1 〇的著冰量，對該著冰量是否 超過第1指定値進行判定，若是超過時就轉換成無負載運 轉模式。再加上，根據無負載運轉模式的狀況，對是否超 -13- 201102498 過第2指定値，或是否低於第1指定値進行判定藉此轉換 運轉模式。 如上述，根據本實施形態時，當檢測出著冰時，不會 立刻停止運轉，而是設定以無負載運轉模式運轉的期間， 根據該無負載運轉模式運轉中的著冰狀態判斷是否停止運 轉，或者，是否轉換成平常運轉模式。如此一來，例如： 當著冰Μ減少成爲第1指定値以下時，就能夠從無負載運 轉模式的狀態迅速轉換成平常運轉模式。藉此，就能夠提 昇風力發電裝置1的工作效率。 另，本實施形態中，雖然是構成於旋翼頭4旋轉的狀 態下檢測出著冰量，但並不限於此。例如也可使用旋翼頭 4不旋轉的狀態下就可檢測出著冰量的構成。於該狀況時 ’因是從運轉停止狀態檢測出著冰量所以就可不需要有轉 換成無負載運轉模式的運轉過程。 此外，本實施形態中，第3指定値是和第1指定値相 等’但並不限於此。例如：第3値也可以是比第1値還小 的値。 【圖式簡單說明】 第1匿1爲表示本發明實施形態相關的風力發電裝置的 槪略構成圖。 第2圖爲表示著冰檢測部一例的功能方塊圖。 胃3 ®爲表示本發明實施形態相關的風力發電裝置運 轉狀態變化的動作流程圖。 -14 - 201102498 【主要元件符號說明】 1 :風力發電裝置 4 :旋翼頭 7 :著冰檢測部（著冰檢測手段） 10 :風車翼 7 1 :傳感部 72 :訊號處理部 73 :訊號受訊部 74 :著冰量算出部 7 5 ’·運轉模式轉換部 -15-201102498 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a wind power generation device and a control method therefor. [Prior Art] Previously, a wind power generating device that generates power using wind power of natural energy has been known. In the wind power generator, ice is generated in the wind turbine blade or the like due to the temperature drop of the outside air, and the supercooled water droplets or the water vapor in the air are caught by the wind turbine blade or the like. For example, Patent Document 1 discloses a method of detecting ice on a wind power generator. [Patent Document 1] U.S. Patent No. 7,086,8, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 However, because the desired lift is not generated, the windmill wings will not rotate and the desired operation cannot be performed. However, in the past, when ice was generated before the wind power generation device was started, the operation of the wind power generation device was time-consuming, so that the operation efficiency of the wind power generation device was lowered. The present invention has been made to solve the above problems, and an object of the present invention is to provide a wind power generator and a control method thereof capable of reducing a stop time of a wind power generator caused by ice on a wind turbine blade. The first aspect of the present invention is an ice detecting means for detecting the ice amount of the wind turbine wing - 5, 201102498. 'When the amount of ice detected by the ice detecting means exceeds the first designated number, the operation will be performed. The mode is converted into a no-load operation mode in which power generation is not performed. The wind power generation device that detects the amount of ice by the above-described ice detection means in the operation state of the above-described no-load operation mode. According to the above configuration, when the amount of ice on the wind turbine detected by the ice detecting means exceeds the first specified 値, it is converted into the no-load operation mode, and the amount of ice is detected in the operating state of the no-load operation mode. . In the past, if the ice was stopped, the operation was stopped immediately. Therefore, for example, when the stop period is long, the machine equipped with the windmill will be cooled, so that it takes a long time to restart. On the other hand, the present invention continues to perform the operation in the no-load operation mode as described above, so that the warm-up can be continuously performed. In this way, for example, when the amount of ice is reduced when the no-load operation mode is implemented and the operation is resumed, the operation can be resumed from the state in which the machine is warmed up, and the time required to start the operation again can be shortened. Preferably, when the wind power generation device is operated in the no-load operation mode, the ice detecting means stops the operation when the amount of ice detected exceeds the second designated number greater than the first designated value. . According to the above configuration, when the amount of ice is less than or equal to the first designation of the first designation ’, the operation in the no-load operation mode is executed, and when the amount of ice exceeds the second predetermined 値, the operation is stopped. In this way, for example, when the second designation is set as the threshold of the amount of ice that causes the operation of the wind power generator to malfunction, the operation of the no-load operation mode can be continued as much as possible within a range in which the operation of the wind turbine is not hindered. It is possible to increase the chance of starting the operation again from the warm-up state. -6-201102498 Preferably, when the wind power generator is operated in the no-load operation mode, the ice-detecting means detects that the amount of ice is lower than the third designation set to be less than the first designation When it is ,, it is converted into the normal operation mode. As described above, when the amount of ice is lower than the third designation set to be less than or equal to the first predetermined value in the state of operating in the no-load operation mode, the mode is changed from the no-load operation mode to the normal operation mode. In this case, even if the amount of ice is once larger than the first designation, since the normal operation is resumed when the amount of ice is reduced, it is possible to prevent the operation efficiency of the wind power generation device from being lowered. Further, hysteresis is provided by the switching condition for switching from the normal operation to the no-load operation and the conversion condition for switching from the no-load operation to the normal operation, whereby the stability of the operation control can be achieved. Preferably, in the state in which the wind power generator is operated in the no-load operation mode, the number of rotations of the wind turbine rotor is set so that the ice attached to the wind turbine blade does not reach the surrounding wind power generator when the wind turbine rotor rotates. As described above, in the no-load operation mode, the number of rotations of the wind turbine rotor is set so as not to allow the ice attached to the wind turbine blade to reach the surrounding wind power generation device. In this way, it is possible to prevent the influence of the ice scattering attached to the wind turbine blade on the surroundings. The ice detecting means of the wind power generator may be configured to detect the amount of ice based on the physical characteristics of the wind turbine blade. In this way, the amount of ice can be calculated using the existing device. Further, physical characteristics such as deformation and the like. In the above-described ice detecting device of the wind turbine generator, when the amount of ice cannot be detected in the state of the stop state of the operation stop 102102498, it is preferable to switch to the no-load operation mode after the specified period of time has elapsed since the operation of the wind turbine is stopped, and the above-described no-load operation is performed. In the operating state of the operation mode, the amount of ice is detected by the above-described ice detecting means. As described above, when the no-load operation mode is executed after the predetermined period of time has elapsed from the operation stop state, the amount of ice can be detected while the operation is performed in the no-load operation mode. Therefore, it is possible to visually confirm the situation after restarting the ice. It can reduce the operation stop time. According to a second aspect of the present invention, in a no-load operation mode in which the amount of ice of the wind turbine blade is detected, when the ice a exceeds the first designation, the operation mode is changed to the non-power generation operation state, and the no-load operation mode is used. The operating state of the wind power generation device for detecting the amount of ice. According to the present invention, it is possible to achieve an effect of reducing the stop time of the wind power generator caused by the ice of the wind turbine blade. [Of. MODE FOR CARRYING OUT THE INVENTION] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a wind power generator according to the present invention will be described with reference to the drawings. Fig. 1 is a schematic block diagram showing a wind power generator 1 according to the present embodiment. The wind power generator 1, as shown in Fig. 1, has a strut 2, an engine compartment 3 provided at the upper end of the strut 2, and a rotor head 4 which is provided with an engine compartment 3 which is rotatable about a substantially horizontal axis -8 - 201102498. The rotor head 4 is mounted with three wind turbine blades 1 呈 radially around its axis of rotation. As a result, the wind that hits the wind turbine blade 10 from the direction of the rotation axis of the rotor head 4 is converted into a power that can rotate the rotor head 4 about the rotation axis, and the power is transmitted via the generator provided in the wind power generator 1. Converted into electric energy. Further, the wind turbine generator 1 includes an ice detecting unit (ice detecting means) 7 for detecting the amount of ice of the wind turbine blade 10, and can detect the amount of ice of each wind turbine blade 1〇. In the present embodiment, the ice detecting unit 7 detects the amount of ice of each of the wind turbine blades 1 in a state in which the rotor head 4 is rotated, and includes a sensor unit 71 and a signal processing unit 72. The sensor unit 71 is provided in each of the wind turbine blades 10, and can detect deformation of the wind turbine blade 1〇, and outputs it to the signal processing unit 72. The signal processing unit 72 is provided inside the rotor head 4 and the like, and can receive the detection result of the sensor unit 71, and calculates the amount of ice of each of the wind turbine blades 10 from the detection result. The sensor unit 7 1 and the signal processing unit 72 are devices for measuring the associated load of the wind turbine blade 1 and are conventional devices. For example, the sensing portion 71 is an FBG (Fiber Bragg Grating) sensor. The FBG sensor is a sensor that reads a deformation or a thermally induced Bragg grid whose lattice spacing changes according to the wavelength change of the reflected light. The technique for calculating the deformation of the sensor unit 7 1 (FBG) and the signal processing unit 72 is a conventional technique (for example, product number WIND-SPECC-006-5 manufactured by Insensys Co., Ltd.), and therefore the detailed description of the use of the techniques is omitted. A method of calculating deformation or the like. More specifically, as shown in Fig. 2, the signal processing unit 72 includes a signal receiving unit 73, an ice amount calculating unit 74, and an operation mode converting unit 75. -9 - 201102498 The signal receiving unit 73 periodically emits light to the sensor unit 71 to detect a change in wavelength from the reflected light. The signal receiving unit 73 outputs the wavelength information detected by the signal receiving unit 73 to the ice amount calculating unit 74. The ice amount calculation unit 74 calculates the amount of ice of the wind turbine blade 1 based on the wavelength information acquired from the signal receiving unit 73. For example, the ice amount calculating unit 74 calculates the deformation based on the acquired wavelength, and then calculates the wind turbine blade 1 ο I crank torque based on the deformation ,, and calculates the ice amount 〇 ice amount calculating unit 74 based on the calculated bending moment. A determination is made as to whether or not the amount of ice exceeds the critical threshold for the amount of ice, and the determination result is output to the operation mode conversion unit 75. Further, the ice amount calculation unit 74 performs determination on each of the three wind turbine blades 10. The operation mode conversion unit 705 switches the operation mode based on the determination result of the ice amount calculation unit 74. Further, it is preferable that the operation mode is switched when the ice S of at least one of the wind turbine blades 10 exceeds the critical threshold. Further, the critical enthalpy is a first designated 设定 which is set for the amount of ice of at least one of the wind turbine blades 1 値 and a second designated 値 which is larger than the first designated 値, and the like. In addition, the third designation in the "K" form is the same as the first designation. More specifically, when it is determined that the ice S of at least one of the wind turbine blades exceeds the first designation, the operation mode switching unit 75 converts the operation mode of the wind power generator 1 into the no-load operation mode. The "no-load operation mode" is, for example, an operation (no load) state in which power generation is not performed. In addition, -10-201102498, for example, the first designation, it is preferable to set the amount of ice that is not necessary to stop the operation although the ice is detected. In the operation state of the no-load operation mode, when the amount of ice of at least one of the wind turbine blades 10 is determined by the ice amount calculation unit 7 to be the first designation or less, the operation mode conversion unit 75 is the wind power. The operation mode of the power generating device 1 is switched to the normal operation mode. In the operating state of the no-load operation mode, when the amount of ice of at least one of the wind turbine blades 10 is determined by the ice amount calculation unit 74 to exceed the second designation, the operation mode conversion unit 75 is stopped. The operation of the wind power generator 1 . More specifically, the second designation 値 is set to be larger than the first designation. Further, it is preferable to set the amount of ice that will hinder the operation of the wind power generator 1 to the second designation. The amount of ice that hinders the operation of the wind power generator 1 refers to the amount of ice that is not conducive to the operation of the wind power generator 1. For example, it means that when the stress in the lower part of the strut 2 is larger than the specified crucible, or when the allowable load exceeds the bearing or the speed increaser, etc. As described above, in another case, the amount of ice that stops the operation of the wind power generator 1 is set, and the amount of ice is operated in the no-load operation mode in the range below the second designated value that is larger than the first designation. It is possible to monitor the state of the ice, and when the state of the ice is reduced, it can be quickly converted into the normal operation mode. Further, when the wind turbine blade 1 is in the stopped state to start the operation, the wind power generator 1 is switched to the no-load operation mode, and the same critical threshold determination as described above is executed. In addition, when it is confirmed that the amount of ice is larger than the second designation, the operation of the wind power generator 1 is stopped, and the ice S is detected at the specified time interval, and the ice volume is confirmed. 2 Specify 値 to start the no-load operation mode again. Further, in the first embodiment, the sensing unit 171 is not detected when the rotation of the rotor is stopped. Therefore, when the operation of the wind power generator 1 is stopped, the rotor is rotated at the designated time, and the ice is opposed to the state. The amount is tested. In the above-described no-load operation mode, the number of revolutions of the wind turbine rotor is such that the number of revolutions in which the ice flies adhering to the wind turbine blades 1 are smaller than the distance to the surrounding wind power generator 1 when the wind turbine rotor rotates. It is said that 'the speed of the wind turbine blade 10 when the number of rotations is calculated (for example, based on the number of rotations that are not generated, so the number of rotations is low), and the distance of the ice flying from the leading edge portion at a detachable speed is The number of rotations is set under the condition that the distance between the adjacent wind power generators 1 is equal to or less. When the interval of the wind workshop is 190 meters, the number of revolutions of the rotor 4 is controlled to be 6 rpm. Next, in the order of the wind power generator 1 according to the present embodiment, the action at the time of detecting the ice during operation and the action at the time of starting the slave state will be described. First, the function is detected during the operation of the wind power generator 1, and will be described using Fig. 3 . When the wind turbine generator 1 is in operation, the deformation is measured by the ice detecting unit 7 unit 71 and the signal receiving unit 73 (the measurement result in step s A 1 is output to the ice calculating unit 74. Further, in the ice 74 'When the W i ' attached to the wind turbine blade 1 定期 is calculated based on the measured deformation, it is determined whether the ice amount W i exceeds the first specified 値, and the amount of ice used is set to a more specific distance. The rotation state causes the calculated near setting to be, for example, έ 1 rpm action, the sensor when the ice is stopped, and the calculation unit sets the amount of ice, and the operation mode conversion unit 7 switches the operation mode at -12-201102498 (step SA 2). ). When the ice amount Wi does not exceed the first designation ’, the operation mode of the wind power generator 1 is set to the "normal operation" mode. When it is determined that the ice amount Wi exceeds the first designation ', the operation mode conversion unit 75 converts the operation mode of the wind power generator 1 into the "no-load operation" mode (step SA4) ° when operating in the no-load operation mode. When the amount of ice Wi exceeds the second designation, it is periodically determined (step SA5). 'When the second designation is exceeded, the amount of ice Wi is increased'. Therefore, the operation of the wind power generator 1 is stopped (step SA6). Further, when the ice amount W i does not exceed the second designation ,, the process returns to step S A1 to continue the measurement of the ice amount Wi. Next, the action when the wind turbine generator 1 is started from the operation stop state will be described using Fig. 3 . When the amount of ice Wi exceeds the second designation, the wind turbine generator 1 is stopped, and it is determined whether or not a predetermined time (for example, one hour) has elapsed (step SA7). When it is determined that the designated time has elapsed, the operation is started in the "no-load operation" mode (step S A8), and then the flow returns to step S A1 to continue the measurement of the ice amount Wi. Further, when the designated time has not elapsed, it is repeatedly determined whether or not the designated time has elapsed (step SA7). As described above, according to the wind power generator 1 and the control method therefor according to the present embodiment, the amount of ice adhering to the wind turbine blade 1 can be calculated based on the deformation measured from the wind turbine blade 10, and Whether the amount of ice exceeds the first designation is determined, and if it is exceeded, it is converted to the no-load operation mode. In addition, according to the state of the no-load operation mode, it is determined whether or not the second designation is exceeded, or whether it is lower than the first designation, thereby determining the operation mode. As described above, according to the present embodiment, when ice is detected, the operation is not immediately stopped, but the operation is performed in the no-load operation mode, and it is determined whether or not the operation is stopped based on the ice-holding state during the no-load operation mode operation. Or, whether it is converted to the normal operation mode. In this way, for example, when the hail is reduced to the first designated value or less, the state of the no-load operation mode can be quickly changed to the normal operation mode. Thereby, the operational efficiency of the wind power generator 1 can be improved. Further, in the present embodiment, the amount of ice is detected in the state in which the rotor head 4 is rotated, but the present invention is not limited thereto. For example, the configuration in which the amount of ice can be detected can be detected in a state where the rotor head 4 is not rotated. In this case, since the amount of ice is detected from the operation stop state, it is not necessary to have an operation process of switching to the no-load operation mode. Further, in the present embodiment, the third designation is the same as the first designation, but is not limited thereto. For example, the third can also be a smaller one than the first one. [Brief Description of the Drawings] The first block 1 is a schematic configuration diagram of a wind power generator according to an embodiment of the present invention. Fig. 2 is a functional block diagram showing an example of the ice detecting unit. The stomach 3 ® is an operational flowchart showing a change in the operational state of the wind power generator according to the embodiment of the present invention. -14 - 201102498 [Description of main component symbols] 1 : Wind turbine generator 4 : Rotor head 7 : Ice detecting unit (Ice detecting device) 10 : Wind turbine blade 7 1 : Sensor unit 72 : Signal processing unit 73 : Signal receiving Signal portion 74: Ice amount calculation unit 7 5 '· Operation mode conversion unit -15-