1290788 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種虛功補償裝置，其特別有關於與感應發電 ‘機並聯操作以提供該感應發電機所需之虛功，該虛功補償裝 置利用一交流電容及一電能轉換器串聯連接後並接於該感應發 電機’其可避免虛功補償裝置之諧振問題，提供在一特定範圍内 •可線性調整之虛功量，並抑制該感應發電機所產生之諳波，經 罄該虛功補償裝置補償後可使感應發電機送至電齡統之電流趨近 於-弦波且與電壓同相位，以產生_接近單位功因之高品質交流 電力送至電源系統。 【先前技術】 鼠籠式感應發電機因為具有結構簡單、堅固、體積小、成本 低、操作簡單及維護容易等優點而非常適合中低容量之風力發電 系統，由於鼠籠式感應發電機缺乏一個獨立的磁場電路，所以在 #運轉時須注入-額外的虛功電流作為激磁，因此需要一虛功補償 ^統纽善解_，域絲頓產生之實功輪虛功率均隨 者感應發電機轉子的轉速上升而增大。 曰驾用上在感應發電機上並聯電力|容器以便提供超前虛功， =提:整體系統的功因。然而電力電容器並聯到系統上，其補償 里不變’無法隨賴應發電機轉子轉速的變動而變動， 此無法達辟位功因。另外，近年來由於非線性負載使用的增 =成觀嚴重污染，而電源纽中最㈣魏污$破壞的裝 置為電力電容H，電力電容！^_顧抗產生串/並聯諧振造 Γ290788 成或引起鄰近非線性負栽之諧波注入而造成電力電容器過載破 壞。 ··、為了解決電力電容器可能產生之諧振問題，第一解決 .方法為提高電力電容器耐壓等級，如此可避免電力電容哭 因諧振過電壓而破壞，然而它並未解決譜振問題，因此; •能造成鄰近電力設備之破壞。另一解決方法為利用料裝 ，置在電力電容器過電壓或過電流時將交流電力電容器： 鲁離電源系統，然而此法將使得虛功補償功能喪失。 由於固定交流電力電容組提供之虛功量為固定，無法 隨著感紐電機轉子轉速的變動而調整，因此無法達到單位功 因。為了使錢電力電容組提供之虛功量輯著感紐電機 轉子轉速的變動而變動，以達到單位功因，美國專利咖，％9,5〇9 及US6,462,519B1提出閘流體控制電容器，利用閘流體來㈣投 入之電容量H其補償之虛功量為步階，無法線性。二 美國專利US5,672,956提djm定電容閘控電抗器，_閘流體串 聯連接-電抗器再並聯接到電容器組，藉由控制閑流體觸發角可 線性調整補償虛功量，然而，它會產生諳波問題。上述兩種方法 '均仍電㈣，錢於電源綠±，_這些綠仍無法有效 解決諧振及鄰近諧波電流注入問題。 為了解決電力電容器應用在虛功補償上的問題，美國專利 US5187427及US5329221利用單-電能轉換器來產生補償虛功 量，如第-圖所示，其利用-電力轉換器（2)並接於感應發電 機（1)及電源系統（4)間’該電力轉換器可提供超前或落後 1290788 之虛功量’其提供之虛功量可線性調整，且該電力轉換器不會與 電源系統產生_/並鶴振，亦不會引起鄰近雜性貞載諧波注 入。然而由於該專利係彻電力轉換器來提供全部的補償虛功 1 ’該電力轉換1§之容量必須包含感應發電機所需之最大虛功 里’因此魏力轉換n需要非常大的容量，使其價格非常昂貴且 技術困難度較高，因而限制其實用性。 為了解決上述虛功補償技術之缺點，美國專利M6876179及 US6876177等提出之虛功補償裝置，利用一電能轉換器與電力電容 器串聯，它可避免電力電容器產生之諧振及諧波注入等問題，並 降低該虛功補償裝置使用之電能轉換器之容量，然而它只能補償 虛功率，且控制電路較複雜。 有鑑於此，本發明乃提出一種虛功補償裝置，它與美國專利 US6876179及US6876177等提出之虛功補償裝置具有相同架構，由 一^電能轉換斋與電力電谷裔串聯組成’它可避免電力電容器產生 之諧振及諧波注入等問題，該虛功補償裝置使用之電能轉換器具 有低容量優點，與美國專利US6876179及US6876177等作比較， 本發明所提之虛功補償裝置更適合應用於感應發電機，本發明 所提之虛功補償裝置除了補償感應發電機所需之虛功外，更具有 抑制感應發電機產生之諧波電流，使補償後感應發電機送至 電源系統之電流趨於一弦波且與電壓同相位，以產生一接近單位 功因之高品質交流電力送至電源系統，且具有更簡單之控制電 路，因此有其進步性。 【發明内容】 1290788 本發明主要目的係提供—適用於感應發電機之虛功 補償裝置，其用以提供無段調整之虛功量避免虛功補償 裝置之諧波破壞’並抑制該感應發電機所產生之諧波，使感 應發電機發出之電力經補償後送至電源系統之電流趨於一弦波且 與電麗同相位，以產生-接近於單位功因之高品f交流電力送至 ' 電源系統。 根據本發明之適用於感應發電機之虛功補償裝置，該 #虛功補償裝置包含-電容器及一電力轉換器，兩者串聯組 成。該電容器用以提供-基本虛功量，藉此降低該電力轉 換器之财受電壓及容量，該電力轉換器由一直流儲能電容 器、一電力電子開關組、一高頻漣波遽波器及一控制器組 成。該直流儲能電容器建立一直流電壓，而經由該控制器 控制該電力電子開關組產车切換動作，該電力電子開關組 切換该直流電壓並輸出一脈波電壓，該脈波電壓經該高頻 漣波濾、波ϋ及該電容器產生—補償電流，該補償電流與該 感應發電機發出電流合併成送至電職統電流，錢發電機發出 之電力經該虛功補償震置麵後送至電源系統之電流趨於一弦波 且與電壓同相位’以產生—接近單位功因之高品質交流電力送至 電源系統。 【實施方式】 為了讓本發明之上述和其他目的、特徵與優點能更明 確被了解，下文將特舉本發明較佳實施例，並配合所附圖 式，作詳細說明如下。 1290788 第二圖揭露本發明之適用於感應發電機之虛功補償 裝置之較佳實施例之系統架構，本發明適用於感應發電機 之虛功補償裝置（3)並聯於一感應發電機（1 )及一電 源系統（4)之間，該感應發電機（1 )產生一交流電能 回送到該電源系統（4 ),該虛功補償裝置（3 )則用以 補償該感應發電機（1)所需之虛功率，以提高從該感應 發電機（1)送至電源系統（4)之電力的功率因數至接 近單位功因。該虛功補償裝置（3)其包含一電容器（3 0)及一電力轉換器（3 1 )串聯組成。該電容器（3 〇) 用以提供一虛功量，藉此降低該電力轉換器（3丄）所提 供之虛功量，該電力轉換器（3 1 )包含一電力電子開關 組（3 1 0 )、一直流儲能電容器（3丄丄）、一高頻漣波 濾波器（3 1 2)及一控制器（5)。該電力轉換器（3 1 )用以使該虛功補償裝置（3)可在某一特定範圍内無 段調整其補償之虛功量，並濾除該感應發電機（1 )產生 之諳波電流，且該電力轉換器（3 1 )亦可避免該虛功補 償裝置（3)所可能產生之諧振破壞。該直流儲能電容器 (3 1 1 )建立一直流電壓，而經由該控制器（5)控制 $玄電力電子開關組（3 1 0)產生切換動作，該電力電子 開關組（3 1 0)切換該直流電壓並輸出一脈波電壓，該 脈波電壓經該南頻連波濾、波器（3 1 2)及該電容器（3 0)產生一補償電流，該高頻漣波濾波器（3丄2)為一 電感斋，§玄補償電流與該感應發電機（1 )發出電流合併成送 1290788 至電源系統（4 )之電流。因此，感應發電機⑴發 經該虛功爾裝置（3 )補償魏至電職統（4 )之電流趨 -弦波且與電壓_位，以產生—接近單位功因之高品質=流電 力送至電源系統（4)。該虛功補償裝置（3 )之操作原理如 下： 且可表示為 (1) 假設三相電源系統（4)之電壓為平衡， ν8α(0= Vssin(〇t vsb(t)= Vssin(cot -120。）1290788 IX. Description of the Invention: [Technical Field] The present invention relates to a virtual work compensation device, which is particularly related to a virtual work required to operate in parallel with an induction power generator to provide the induction generator, the virtual work compensation The device uses an AC capacitor and an electric energy converter connected in series and is connected to the induction generator to avoid the resonance problem of the virtual work compensation device, and provides a linearly adjustable virtual work amount within a certain range, and suppresses the The chopping wave generated by the induction generator can be compensated by the virtual power compensation device, so that the current sent by the induction generator to the electric age system approaches the sine wave and is in phase with the voltage, so as to generate a near-unit power factor. High quality AC power is delivered to the power system. [Prior Art] The squirrel-cage induction generator is very suitable for low- and medium-capacity wind power generation systems because of its simple structure, firmness, small size, low cost, simple operation and easy maintenance. Independent magnetic field circuit, so it must be injected during operation # additional virtual work current as excitation, so it needs a virtual work compensation ^ New Zealand solution _, the real power of the real power wheel generated by the domain is the induction generator The rotation speed of the rotor increases and increases.曰Use the parallel power on the induction generator | container to provide advanced virtual work, = mention: the overall system's power factor. However, the power capacitor is connected in parallel to the system, and the compensation is constant. It cannot be changed depending on the fluctuation of the rotor speed of the generator. In addition, in recent years, due to the increase in the use of non-linear loads, it has become a serious pollution, and the most (four) Wei pollution $ destruction device in the power supply is the power capacitor H, power capacitor! ^_顾抗 generates a series/parallel resonance Γ 290788 or causes harmonic injection of a neighboring nonlinear load to cause the power capacitor to be overloaded and damaged. ································································································ • Can cause damage to nearby electrical equipment. Another solution is to use the material package to place the AC power capacitor when the power capacitor is over-voltage or over-current: it is away from the power system, but this method will make the virtual power compensation function lost. Since the amount of virtual work provided by the fixed AC power capacitor group is fixed, it cannot be adjusted with the fluctuation of the rotor speed of the sense motor, so the unit function cannot be achieved. In order to make the virtual power provided by the Qian Power Capacitor Group change the rotational speed of the rotor of the new motor to achieve the unit power factor, the US patent coffee, %9,5〇9 and US6,462,519B1 propose a thyristor control capacitor. The sluice fluid is used to (4) the electric capacity H of the input, and the amount of virtual work compensated is step-by-step, which is not linear. 2. U.S. Patent No. 5,672,956 proposes a djm fixed capacitance gate-controlled reactor, _ thyristor series connection-reactor is connected in parallel to the capacitor bank, and the compensation dummy energy can be linearly adjusted by controlling the idle fluid firing angle, however, it will generate Chopper problem. The above two methods are still electric (four), money on the power supply green ±, _ these green can not effectively solve the problem of resonance and adjacent harmonic current injection. In order to solve the problem of power capacitor application in virtual power compensation, U.S. Patent Nos. 5,187,427 and 5,329,221 use a single-to-electric energy converter to generate a compensation virtual amount of power. As shown in the figure, the power converter (2) is connected in parallel. Between the induction generator (1) and the power system (4) 'The power converter can provide lead or trailing virtual power of 1290788'. The virtual power provided can be linearly adjusted, and the power converter will not be generated with the power system. _ / and He Zhen, will not cause adjacent hybrid interference. However, since the patent is based on a power converter to provide full compensation for virtual work 1 'the capacity of the power conversion 1 § must contain the maximum virtual work required for the induction generator', so the Wei force conversion n requires a very large capacity, so that The price is very expensive and the technical difficulty is high, thus limiting its practicality. In order to solve the shortcomings of the above-mentioned virtual work compensation technology, the virtual work compensation device proposed by US Pat. No. 6,687,179 and US Pat. No. 6,876,177 uses a power converter in series with a power capacitor, which can avoid the problems of resonance and harmonic injection generated by the power capacitor and reduce The virtual power compensation device uses the capacity of the power converter, however it can only compensate for the virtual power, and the control circuit is complicated. In view of the above, the present invention provides a virtual power compensation device which has the same structure as the virtual power compensation device proposed by US Pat. No. 6,878,179 and US Pat. No. 6,876,177, and is composed of a series of electric energy conversion and electric power. The problem of resonance and harmonic injection generated by the capacitor, the power converter used by the virtual work compensation device has the advantage of low capacity, and compared with the US patents US6876179 and US6876177, the virtual work compensation device proposed by the present invention is more suitable for induction. The generator, the virtual power compensation device proposed by the invention not only compensates for the virtual work required by the induction generator, but also suppresses the harmonic current generated by the induction generator, so that the current sent to the power system after the compensation of the induction generator tends to A chord wave and the same phase as the voltage to generate a high-quality AC power close to the unit power is sent to the power supply system, and has a simpler control circuit, so it is progressive. SUMMARY OF THE INVENTION The main object of the present invention is to provide a virtual power compensation device suitable for an induction generator, which is used to provide a virtual power without step adjustment to avoid harmonic damage of the virtual work compensation device and to suppress the induction generator. The generated harmonics cause the electric power generated by the induction generator to be compensated and then sent to the power supply system. The current tends to be a sine wave and is in phase with the electric galvanic to generate a high-quality electric power that is close to the unit power. ' Power Systems. According to the virtual work compensation device of the present invention, which is suitable for an induction generator, the #virtual work compensation device comprises a capacitor and a power converter, which are formed in series. The capacitor is configured to provide a basic virtual power amount, thereby reducing the voltage and capacity of the power converter. The power converter comprises a DC storage capacitor, a power electronic switch group, and a high frequency chopper chopper. And a controller composition. The DC storage capacitor establishes a DC voltage, and the power electronic switch group controls the switching operation of the power electronic switch group, and the power electronic switch group switches the DC voltage and outputs a pulse voltage, and the pulse voltage passes through the high frequency The chopper filter, the wave and the capacitor generate a compensation current, and the compensation current is combined with the current generated by the induction generator to be sent to the electric job current, and the power generated by the money generator is sent to the vibration surface through the virtual work compensation surface. The current of the power system tends to be a sine wave and is in phase with the voltage 'to generate - high quality AC power close to the unit power is sent to the power system. The above and other objects, features and advantages of the present invention will become more apparent from 1290788 The second figure discloses a system architecture of a preferred embodiment of the virtual work compensation device for an induction generator of the present invention. The present invention is applicable to a virtual work compensation device (3) for an induction generator connected in parallel to an induction generator (1). And a power supply system (4), the induction generator (1) generates an alternating current power back to the power system (4), and the virtual work compensation device (3) is used to compensate the induction generator (1) The required virtual power is used to increase the power factor of the power delivered from the induction generator (1) to the power system (4) to near unit power. The virtual work compensation device (3) comprises a capacitor (30) and a power converter (3 1 ) connected in series. The capacitor (3 〇) is used to provide a virtual power amount, thereby reducing the amount of virtual work provided by the power converter (3 )), and the power converter (3 1 ) includes a power electronic switch group (3 1 0) ), a current storage capacitor (3丄丄), a high frequency chopper filter (3 1 2) and a controller (5). The power converter (3 1 ) is configured to enable the virtual work compensation device ( 3 ) to adjust the compensated virtual work amount without a segment within a certain range, and filter the chopping generated by the induction generator (1 ) The current, and the power converter (3 1 ) can also avoid the resonance damage that may be generated by the virtual work compensation device (3). The DC energy storage capacitor (3 1 1 ) establishes a DC voltage, and the controller (5) controls the power transmission switch (3 1 0) to generate a switching action, and the power electronic switch group (3 1 0) switches. The DC voltage outputs a pulse wave voltage, and the pulse wave voltage generates a compensation current through the south frequency continuous wave filter, the wave device (3 1 2) and the capacitor (30), and the high frequency chopping filter (3)丄 2) is an inductance fast, § 补偿 compensation current and the induction generator (1) output current combined to send 1290788 to the power system (4) current. Therefore, the induction generator (1) transmits the current sine wave and the voltage _ bit of the Wei to the electric system (4) through the virtual power device (3) to generate a high quality = flow power close to the unit power factor Send to the power system (4). The operation principle of the virtual work compensation device (3) is as follows: and can be expressed as (1) assuming that the voltage of the three-phase power supply system (4) is balanced, ν8α(0=Vssin(〇t vsb(t)= Vssin(cot - 120.)
vsc(t)=Vssin(cot + 1200) 其中G為電源系統（4 )之電壓的振幅，在電力轉換器（3 1) 未輸出電壓時，則由電容器（3 〇)所提供基本的虛功量為·· ^ -^cvs2 x 2 (2) 在此ω為電源系統（4)之角頻率，c為電容器（3 〇)之電容 量。由於電力轉換器（31)只使用一直流儲能電容器（3 i工） 放在其直流侧作為能量緩衝器，因此在穩態且不考慮電力轉換器 (31)本身之損失時電力轉換器（31)不可吸入實功，僅可 作為輸出補償虛功量之調整，因此電力轉換器（31)必須輪出 一與電源系統電壓同相位之弦波電壓，它可表示為·· vc^)-±Vc&m&t vcb(t)-±Vcsin(0t-12O°) ( 3 ) vcc(t)= ±V。sin(cot +120。） 其中乙為電力轉換器（3 1 )之輸出電壓之振幅，此時橫跨在電 容器（3 0)上的電壓振幅為： (4) 1290788Vsc(t)=Vssin(cot + 1200) where G is the amplitude of the voltage of the power system (4). When the power converter (3 1) does not output voltage, the basic virtual work is provided by the capacitor (3 〇). The quantity is ·· ^ -^cvs2 x 2 (2) where ω is the angular frequency of the power supply system (4) and c is the capacitance of the capacitor (3 〇). Since the power converter (31) uses only the DC storage capacitor (3 i) placed on its DC side as an energy buffer, the power converter is in a steady state and does not consider the loss of the power converter (31) itself ( 31) The non-inhalable real work can only be used as the output compensation virtual power adjustment. Therefore, the power converter (31) must rotate a sine wave voltage in the same phase as the power supply system voltage, which can be expressed as ·· vc^)- ±Vc&m&t vcb(t)-±Vcsin(0t-12O°) ( 3 ) vcc(t)= ±V. Sin(cot +120.) where B is the amplitude of the output voltage of the power converter (3 1 ), and the amplitude of the voltage across the capacitor (30) is: (4) 1290788
Vp=(Vs+Vc) 則虛功補償裝置（3)送出之總虛功輸出為： Qc=|qCVs(Vs+Vc) (5) 經由虛功補償裝置（3)送出之總虛功輸出與電容器（30) 單獨存在時提供的基本虛功量之關係為：Vp=(Vs+Vc) The total virtual power output sent by the virtual power compensation device (3) is: Qc=|qCVs(Vs+Vc) (5) Total virtual power output sent by the virtual power compensation device (3) The relationship of the basic virtual work volume provided by the capacitor (30) when it is present separately is:
由（6)式可知藉由串聯電力轉換器（3 1 )輸出電壓振幅之控制 可以改變虛功補償裝置（3)所提供的虛功量。在電力轉換器 (3 1)沒有過調變的情況下，輸出最大的基波電壓振幅ve，max與 電力轉換器（3 1)之直流儲能電容器（3 1 1 )之電壓vde之關 係可表示為：It can be seen from equation (6) that the amount of virtual power provided by the virtual power compensation device (3) can be changed by the control of the output voltage amplitude of the series power converter (3 1 ). In the case that the power converter (3 1) is not over-modulated, the relationship between the output of the maximum fundamental voltage amplitude ve,max and the voltage vde of the DC storage capacitor (3 1 1 ) of the power converter (31) may be Expressed as:
(7)(7)
因此虛功補償裝置（3)最小虛功輸出為： (8) 而虛功補償裝置（3)最大虛功輸出為： (9) 因此，虛功補償裝置（3)之虛功輸出可在Qmin和Qmax之間做線 性調。 第三圖揭露本發明較佳實施例中電力轉換器（3 1 ) 11 1290788 之控制器（5)之方塊圖，該和法丨哭, 遠控制為（5)包含一第一電 壓檢出器（5 0 0 )、一減法器Γ 5 η Ί h ^ 0、 命C5 〇1)、一第一控制器C 5 0 =)、-第二電驗出器（5〇3)、—弦波產生器（5()4)、一 乘法電路（5 〇 5 )、一電流檢出 “、 _(5〇6)、-第二控制器（5 ◦ 7)及一三相脈寬調變器（5 〇、 、υ 8 )等。為了獲得較好的響應 、度’電力轉換器（31)採用電流控制模式，雖然電力轉換器 j 31)採用電流控制模式，但前面最大虛功及最小虛功之補償 範圍仍有效。 由於期魏紐錢（1 )送至魏系統（4 )之電流為純 正弦波且與電齡統（4)電朗她以達到單位功因，因此補 償後之電源系統（4 )電流為·· ^α(ή=^1^η(ωί) ^sb (f) = —/ jsin{(^ t — 720°) (1 〇 ) ν*(〇= -Ijsin((〇t + J200) 其中L為期望市電電流的振幅，而負號代表電力是域應發電機 (1 )送至電源系統⑷。該虛功補償裝置（3)之電力轉換器 (31)之控制對象為電源系統⑷電流，因此必先計算出電 去片缺（4 )電机之參考信號’由式⑽中可以看出市電電流參 γ僅有振t«為未知參數，而振幅可由該直流儲能電容器（3 流儲能’因此第三圖之控制方塊中首先將該直 H m 1：>電壓送到該第-電壓檢出H (500)， r R n / 5〇〇)之輸出再與其設定值送到該減法器 、咸錢法器（5 〇 1)輸出送到該第一控制器（5 12 1290788 〇2)料到—振幅信號；該電源錢u)的：相電私^ 二電壓檢_(5Q3) ^ 經該第 出i该w ^饱® 5亥第二電壓檢出器（5〇3)於 出再达到s亥弦波產生器（5〇4 )輪 的：相雷厭pm U4)以產生一組與該電源系統（4) =目:壓同相位之单位振幅之參专弦波信號 4) 〇4)輪出之該參考弦波信號與該第—控制哭（5產生為（5 振幅信號送到該乘法電路（5 )輪出之 該電源系統（4)電相乘以得到電流參考信銳， 3路咖5)與該電流檢出器(5 0 6 )之輸出“乘 = ·(5〇„7)，最後該第二控制器⑽7)輸出再送 目良調變益（5〇8)以產生該電力電子開關組 Λ 驅動信號》 、〇丄υ)之 綜上所述，由本發贿提虛功補償裝置（3)可藉 簡單的控制方塊即可達到使感應發電機（工）送至電源系 之電流趨於-弦纽與電壓_位，以產生—接近單位功因之言 品質交流電力送至電源系統（4 )。 门 第四圖所示為未經該虛功補償裝置（3)補償且電源系統電 壓正常時該電源系統（4 )之R相電塵及該感應發電機⑴送 至電源系統（4)之三相電流波形之實測結果，從第四圖中可以 看出送回该電源系統（4 )的電流與電壓存在著相當大的相位移， 因此其功率因數相當低；第五圖所示為經該虛功補償裝置（3) 補償且電源系統（4)電壓失真時該電源系統（4)之R相電壓 及該感應發電機（1)送至電源系統（4)之三相電流波形之實 測結果，由第五圖中可以發現，經虛功補償裝置（3)之補償後 13 1290788 送回該電源系統（4)的電流與電壓其相位移接近零，其功率因 ^ 數趨近於單位功因。Therefore, the minimum virtual work output of the virtual power compensation device (3) is: (8) and the maximum virtual work output of the virtual work compensation device (3) is: (9) Therefore, the virtual work output of the virtual work compensation device (3) can be in Qmin Make a linear adjustment between Qmax and Qmax. The third figure discloses a block diagram of a controller (5) of a power converter (3 1 ) 11 1290788 in a preferred embodiment of the present invention. The method is crying, and the remote control is (5) including a first voltage detector. (5 0 0 ), a subtractor Γ 5 η Ί h ^ 0, life C5 〇 1), a first controller C 5 0 =), - a second electrical detector (5 〇 3), - sine wave Generator (5 () 4), a multiplying circuit (5 〇 5 ), a current detection ", _ (5 〇 6), - second controller (5 ◦ 7) and a three-phase pulse width modulator (5 〇, υ 8 ), etc. In order to obtain better response, the power converter (31) adopts the current control mode, although the power converter j 31) adopts the current control mode, but the front maximum virtual power and the minimum virtual The compensation range of the power is still valid. Because the current of the Weixin money (1) sent to the Wei system (4) is pure sine wave and the electric age system (4) is used to reach the unit power factor, the compensated power source The system (4) current is ··^α(ή=^1^η(ωί) ^sb (f) = —/ jsin{(^ t — 720°) (1 〇) ν*(〇= -Ijsin(( 〇t + J200) where L is the amplitude of the desired mains current and negative is the electric The domain should be sent to the power system (4) by the generator (1). The power converter (31) of the virtual power compensation device (3) is controlled by the power system (4) current, so the power chip must be calculated first (4) The reference signal of the motor 'from equation (10) can be seen that the mains current parameter γ only vibration t« is an unknown parameter, and the amplitude can be obtained by the DC storage capacitor (3 flow energy storage) so the control block in the third figure will first The straight H m 1:> voltage is sent to the first voltage detection H (500), r R n / 5〇〇) and the output is sent to the subtractor and the salt money processor (5 〇1) The output is sent to the first controller (5 12 1290788 〇 2) to - amplitude signal; the power supply money u): phase electric private ^ two voltage detection _ (5Q3) ^ by the first i i w ^ full ® 5 Hai Second Voltage Detector (5〇3) in the sigma-wave generator (5〇4) wheel: Phase Thunder pm U4) to generate a set with the power system (4) =目: The sine wave signal of the unit amplitude of the same phase is pressed 4) 〇4) The reference sine wave signal is rotated and the first control is crying (5 is generated as (5 amplitude signal is sent to the multiplication circuit (5) wheel Out The power system (4) is multiplied by the electric phase to obtain the current reference letter sharp, the 3 way coffee 5) and the output of the current detector (5 0 6 ) "multiply = · (5 〇 „ 7), and finally the second controller (10) 7) Output and re-deliver the good change (5〇8) to generate the power electronic switch group Λ drive signal 》, 〇丄υ) In summary, the bribe-free virtual work compensation device (3) can be simple The control block can achieve the current that the induction generator (work) sends to the power system tends to - the chord and the voltage _ bit to generate - close to the unit of the power of the quality of the AC power is sent to the power system (4). The fourth figure of the door shows the R phase electric dust of the power system (4) and the induction generator (1) sent to the power system (4) without the compensation of the virtual power compensation device (3) and the power system voltage is normal. The measured result of the phase current waveform, it can be seen from the fourth figure that there is a considerable phase shift between the current and the voltage returned to the power system (4), so the power factor is quite low; the fifth figure shows The virtual power compensation device (3) compensates and the power system (4) voltage is distorted when the power system (4) R phase voltage and the induction generator (1) sent to the power system (4) three-phase current waveform measured results It can be found from the fifth figure that after the compensation of the virtual work compensation device (3), 13 1290788 returns the current and voltage of the power system (4) with a phase shift close to zero, and its power is closer to unit work. because.
• 第五圖所示為經該虛功補償裝置3補償時該電源系統4之R 相電壓及該感應發電機1送至電源系統4之三相電流波形之實測 結果，由第5圖中上面第1波形及第2波形所示之R相電壓與!^ 相電流可看出R相電壓與R相電流之相位幾乎相差18〇度，此時R 相電流為經補償後流入發電機系統之電流，若改為由發電機系統 鲁流出時其相位幾乎相差0度，故「經該虛功補償裝置補償後可使 感應發電機系統送至該電源系統之電流趨於一弦波且與該電源系 統之電壓同相位」得以驗證。 又，第五圖所示為經該虛功補償裝置3補償時該電源系統4 之R相電壓及該輯祕4送至錢發電機丨及該虛功補償裝置 3之三相電流波形之實測結果，第5圖中由上而下分別為R相電 磨、R相電'流、S相電流及τ相電流，由帛5圖中可以發現，經虛 _功補償裝置3之補償後送回該電齡統4的電流與電壓其相位移 接近零，其功率因數趨近於單位功因。 第六圖所示為未經該虛功補償裝置（3 )補償且電源系統（4 )1：壓失真時該電源系統⑷之_電壓及該感應發電機（1 )送至電職統⑷之三相電流波形之實測結果，從第六圖中 可以看出送回該電源系統（4)的電流會受到該電源系統（4) 電壓真的’讀而使得其波形也產生畸變；第七圖所示為經該虛 功補償裝置（3)補償且電源系統（4)電壓失真時該電源系統 (4 )之R相電壓及该感應發電機（1)送至電源系統（*)之 1290788 二相電流波形之實測結果，由第七圖中可以發現，在電壓失真的 情形之下經虛功補償裝置（3)之補償後之送賴電源系統Μ )之三相電流仍能維持為弦波且與該電源系統（4)之電壓同相 •位，因此證明本發明所提虛功補償裝置（3 )可使感應發電機（丄 )即使在該電源祕（4 )電壓失真下’亦能送回高品質的三相 電力。 雖然本發明已以前述較佳實施例揭露，然其並非用以限定本 鲁發明，任何熟習此技藝者，在不脫離本發明之精神和範圍内，當 了作各種之更動與修改，因此本發明之保護範圍當視後附之申請 專利範圍所界定者為準。• Figure 5 shows the measured results of the R-phase voltage of the power system 4 and the three-phase current waveform sent by the induction generator 1 to the power system 4 when compensated by the virtual power compensation device 3, as shown in Figure 5 The R-phase voltage and the ?-phase current shown in the first waveform and the second waveform show that the phase of the R-phase voltage and the R-phase current are almost 18 degrees apart, and the R-phase current is compensated and flows into the generator system. If the current is changed to 0 degrees by the generator system, the phase of the induction generator system can be sent to the power system and the current tends to be a string of waves. The voltage phase of the power system is verified. Moreover, the fifth figure shows the R phase voltage of the power system 4 and the three-phase current waveform of the secret generator 4 and the virtual power compensation device 3 when the virtual power compensation device 3 compensates. As a result, in the fifth figure, the R-phase electric grind, the R-phase electric 'flow, the S-phase current, and the τ-phase current are respectively from the top to the bottom, which can be found from the figure 帛5, and is compensated by the virtual-power compensation device 3 The current and voltage of the battery system 4 are close to zero, and the power factor is close to the unit power factor. The sixth figure shows the voltage of the power system (4) and the induction generator (1) sent to the electric service system (4) without the compensation of the virtual power compensation device (3) and the power system (4)1: pressure distortion. The measured result of the three-phase current waveform can be seen from the sixth figure. The current sent back to the power system (4) is subject to the true reading of the voltage of the power system (4), and the waveform is also distorted; Shown is the R phase voltage of the power system (4) compensated by the virtual power compensation device (3) and the power system (4) voltage distortion and the induction generator (1) is sent to the power system (*) 1290788 II The measured results of the phase current waveform can be found in the seventh figure. In the case of voltage distortion, the three-phase current of the power supply system 补偿) compensated by the virtual power compensation device (3) can still be maintained as a sine wave. And the voltage of the power system (4) is in phase, so it is proved that the virtual power compensation device (3) of the present invention can make the induction generator (丄) even if the power supply (4) voltage distortion is Return high quality three-phase power. The present invention has been disclosed in the foregoing preferred embodiments, and is not intended to limit the invention. It is to be understood that the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
15 1290788 【圖式簡單說明】 第一圖係習用電力轉換器作為虛功補償之架構示意圖。 第二圖係本發明較佳實施例虛功補償裝置之架構示意圖。 第三圖係本發明較佳實施例虛功補償裝置之電力轉換器 之控制器之方塊圖。 第四圖係未經該虛功補償裝置補償且電源系統電壓正常時該電 源系統之R相電壓及該感應發電機送至電源系統之三相電 _ 流波形之實測結果。 第五圖係經該虛功補償裝置補償且電源系統電壓正常時該電源 系統之R相電壓及該感應發電機送至電源系統之三相電流 波形之實測結果。 第六圖係未經該虛功補償裝置補償且電源系統電壓失真時該電 源系統之R相電壓及該感應發電機送至電源系統之三相電 流波形之實測結果。 第七圖係經該虛功補償裝置補償且電源系統電壓失真時該電源 > 系統之R相電壓及該感應發電機送至電源系統之三相電流 波形之實測結果。 16 1290788 【主要元件符號說明】 ~ (1)感應發電機 ^ (2)電力轉換器 (3) 虛功補償裝置 (3 0 )電容器 (31)電力轉換器 (3 1 0)電力電子開關組 _( 3 1 1)直流儲能電容器 (3 1 2)高頻漣波濾波器 (4) 電源系統 (5 )控制器 (5 0 0 )第一電壓檢出器 (5 0 1 )減法器 (5 0 2)第一控制器 (503)第二電壓檢出器 • (5 0 4)弦波產生器 ( 5 0 5 )乘法電路 (506) 電流檢出器 (507) 第二控制器 (508) 三相脈寬調變器 (S > 1715 1290788 [Simple description of the diagram] The first diagram is a schematic diagram of the conventional power converter as a virtual power compensation. The second figure is a schematic structural diagram of a virtual work compensation apparatus according to a preferred embodiment of the present invention. Figure 3 is a block diagram of a controller of a power converter of a virtual power compensation device in accordance with a preferred embodiment of the present invention. The fourth graph is the measured result of the R-phase voltage of the power system and the three-phase current waveform sent by the induction generator to the power system without the compensation of the virtual power compensation device and the power system voltage is normal. The fifth graph is the measured result of the R phase voltage of the power system and the three-phase current waveform sent by the induction generator to the power system when the virtual power compensation device compensates and the power system voltage is normal. The sixth graph is the measured result of the R-phase voltage of the power system and the three-phase current waveform sent by the induction generator to the power system without the compensation of the virtual power compensation device and the voltage distortion of the power supply system. The seventh picture is the measured result of the R phase voltage of the power > system and the three-phase current waveform sent by the induction generator to the power system when the virtual power compensation device compensates and the power system voltage is distorted. 16 1290788 [Explanation of main component symbols] ~ (1) Induction generator ^ (2) Power converter (3) Virtual power compensation device (3 0) Capacitor (31) Power converter (3 1 0) Power electronic switch group _ ( 3 1 1) DC storage capacitor (3 1 2) high frequency chopper filter (4) power system (5) controller (5 0 0) first voltage detector (5 0 1) subtractor (5 0 2) First controller (503) Second voltage detector • (5 0 4) Sine wave generator ( 5 0 5 ) Multiplication circuit (506) Current detector (507) Second controller (508) Three-phase pulse width modulator (S > 17