201121191 六、發明說明： 【奋明所屬之技術領域】 [0001] 本發明係關於一種三相混合式電力滤波裝置之電力轉換 器’其特別有關於應用於濾除三相三線式配電系統错波 電流之混合式電力濾波裝置之電力轉換器，該電力轉換 器由採用二極體箝位式多階電力轉換器，其可提高整體 混合式電力濾波裝置之效率，降低電力電子開關之耐受 電壓及電磁干擾。 _ 【先前技術】 〇 [0002] 近年來配電系統中由於非線性負載快速增加，產生大量 、 諧波電流，該諧波電流導致嚴重影響電力品質，並導致 配電系統諸多問題，如變壓器過熱現象、旋轉電機之擾 ' 動、電壓失真、破壞電力元件及機器故障等。傳統上解 • 決諧波問題的方法係採用被動式電力濾波器，該被動式 電力濾波器由電感及電容器組成，然而被動式電力遽波 器會造成諸振問題’且會引起鄰ϋ波電流注入問題， 0 而造成被動式電力濾波器之破壞。另外，其濾波特性易 受系統電抗影響，而難以獲得良。好;的濾波效果。 [0003] 另一解決諧波問題的方法係如美國專利US5, 977, 660及 US5, 321，598等採用主動式電力渡波器，請參照第一圖 所示，其揭示習用主動式電力濾波器之電路示意圖。該 主動式電力濾波器8包含一濾波電感, 一橋式電力轉換 器81及一儲能電容器82。該主動式電力濾波器8將產生一 補償電流注入一電力饋線，以遽除負載所產生之諧波電 流。雖然該主動式電力濾波器8具有良好的滤波特性，然 098142901 表單編號Α0101 第3頁/共17頁 0982073660-0 201121191 丨III ^主動式電力濾波器8容量必須等於負載諧波笨流與 电源包壓之襄義’因此該主動式電力濾波器8容量狼大造 成其價格昂貴，因而限制其實用性。 _為了解決被動式電力餘器諧振、鄰近諧波電流注入所 &成過载問題及主動式電力濾波器容量大所造成之價格 叩責問題’而有混合式電力濾波裝置被發展出來，如美 國專利US5, 657, 994及US5, 731，965等，請參照第二圖 所不，其揭示該混合式電力濾波裝置9由一被動式電力濾 波器90結合主動式電力濾波器91而成。該被動式電力濾 波器90用以降低該主動式電力濾波器91之容量，而該主 動式電力濾波器91則用以改善被動式電力濾波器9〇之濾 波效果’並避免諧振及鄰近諧波電流注入等問題，因此 ’該混合式電力濾波裝置可應用於較大電力容量之非線 性負載作為諧波濾除。但其整體混合式電力濾波裝置之 效率仍屬有限。 ； .... .. .... ; 【發明内容】 [0005]有鑑於混合式電力濾波裝置具有被動式電力濾波器及主 動式電力濾波器之優點，在專利US5, 567, 994及 US5, 731，965等混合式電力濾波裝置應用在三相三線式 配電系統時’該主動電力渡波器中之電力轉換器均採用 三相橋式架構’該三相橋式架構使用之電力電子開關元 件之耐壓為直流侧電壓’所導致整體混合式電力渡波裝 置之效率仍屬有限，本發明人為進一步提高整體混合式 電力濾波裝置之效率，降低電力電子開關之耐受電壓及 電磁干擾’特發展出一種以二極體箝位式多階電力轉換 098142901 表單編號A0101 第4頁/共17頁 0982073660-0 201121191 器為基礎之混合式電力濾波裝置，其除了具有提高整體 混合式電力濾波裝置之效率外、更可以降低電力電子開 關之耐受電壓及減少電磁干擾之優點。 [0006] 本發明所使用之技術手段在於設計一種三相混合式電力 濾波裝置，該混合式電力濾波裝置並聯至一電源系統及 一負載；該混合式電力濾波裝置包含： [0007] 一被動式電力濾波器； [0008] —二極體箝位式多階電力轉換器，與該被動式電力濾波 器串聯； [0009] —零序電流迴路，與該二極體箝位式多階電力轉換器電 性連接； [0010] 該混合式電力濾波裝置產生一補償電流注入該電源系統 ，抵銷該負載所產生諧波電流，使該電源系統電流趨於 正弦波。 【實施方式】 W [0011] 為了讓本發明之上述和其他目的，特徵及優點能更明確 被了解，下文特舉本發明之較佳實施例，並配合所附圖 示，作詳細說明如下： [0012] 請參考第三圖所示，其揭示本發明之三相混合式電力濾 波裝置之較佳實施例，該電源1供應一三相電力給負載3 ，該混合式電力濾波裝置2與該負載3並聯，用以濾除該 負載3所產生之諧波電流。 [0013] 請再參考第三圖所示三相混合式電力濾波裝置之較佳實 098142901 表單編號Α0101 第5頁/共17頁 0982073660-0 201121191 細*例°亥/tti合式電力遽波裝置2包括一被動式電力遽、波器 20與一二極體箝位式多階電力轉換器21串聯連接及電性 連接一令序電流迴路22，該被動式電力濾波器20為由電 感器與電容器組成之一組或多組三相單調諧式電力濾波 器組成，該單調諧式電力濾波器選擇調諧在負載主要諧 波頻率，大部分該電源丨之電壓之基本波成分均降在該被 動式電力濾波器20，因此該被動式電力濾波器2〇可以減 少該二極體箝位式多階電力轉換器21之電力容量。 [0014] 該二極體箝位式多階電力轉換器21由一電力電子開關組 21 〇及兩個直流電容2 U、212，該電力電子開關組2丨〇包 含二個直流端（+、N及一）、(一三臂式電力電子開關組及 二個父流端（A，B，C)，該二極體籍位式多階電力轉換器 21為一習知之二極體箝位式多階電力轉換器，該三臂式 電力電子開關組含有三個電力電子開關臂，每一臂電力 電子開關包含四個電力電子開關組及兩個箝位二極體， 該四個電力電子開關組串聯連接，每一個電力電子開關 組由一電力電子開關友一二極體並聯連接，該兩個直流 電容211、212串聯，該兩個直流電容211、212具相同電 容值，該兩個直流電容211、21 2串聯之兩端及其串聯接 點分別連接至該電力電子開關組21〇之三個直流端（+、 —及N) ’該電力電子開關組21〇之三個交流端（a，B, c)連 接至該被動式電力濾波器20。 該零序電流迴路22包含一組三相端（221)及一個中性端 (222)及一三相電感器（223)，該三相端（221)包含三個 點，β亥二相端（2 21)之三個端點分別連接至該二極體籍 098142901 表單編號Α0101 第6頁/共17頁 0982073660-0 [0015] 201121191 - 位式多階電力轉換器21.中該電力電子開關組21 0之三個交 流端（A，B，C) ’而該零序電流迴路22之中性端（222)則連 接至該兩個直流電容211、212串聯接點及該電力電子開 關組210之直流端N。 [0016]該三相電感器（223)包含三個電感器，該三個電感器之一 端構成該零序電流迴路22之三相端221，而該三個電感器 之另一端互相連接在一起構成該零序電流迴路22之中性 端2 2 2。該兩個直流電容211、212建立兩個直流電壓， 0 該兩個直流電壓遠小於該電源1之電壓之峰值，而該電力 電子開關組210切換該兩個直流電容211、212建立之直 流電壓以產生一補償電壓，該二極體箝位式多階電力轉 換器21產生之補償電壓用以提升該被動式電力濾波器2〇 之濾波效果，並保護該被動式電力濾波器2〇免於諧振及 鄰近譜波電流注入之破壞；該二極體箝·位式多階電力轉 換器21之正常操作有賴於該兩個:.直流電容211、212產生 兩相等之直流電壓’然而由...於該兩個直流電容211、212 〇 ，因製造之誤差，其電容值不今能完全相同，或由於負 載3變化之暫態，其均可能造成該兩個直流電容211、212 產生之直流電壓不均等，而二極體箝位式多階電力轉換 器21應用在混合式電力濾波裝置2時，由於該被動式電力 遽波器20為单調諧式電力濾波器，其每一相單調諧式電 力濾波器由一個電感器與一個電容器串接組成，因此該 被動式電力遽波器20在每一相均包含一個電容器，而·ϊ亥 電容器將阻隔直流電流，造成該二極體箝位式多階電力 轉換器21無法利用一微小直流電流來達到該兩個直流電 098142901 表單編號Α0101 第7頁/共17頁 0982073660-0 201121191 、容211、212之均壓，因此該二極體箝位式多階電力轉換 :¾:力毚21需一零序電流迴路22，与纪零序電流迴路22用以流過 一微小的直流電流以達到該兩個直流電容211、212之均 壓，由於該零序電流迴路22只流過一微小直流電流，且 其端電壓為該兩個直流電容211、212之電壓，其遠小於 該電源1之電壓之峰值，因此其體積非常小。經由該二極 體箝位式多階電力轉換器21之控制，該混合式電力濾波 裝置2產生一三相補償電流，該三相補償電流注入該電源 1之電力饋線後可使得該電源1所提供之三相電流均趨於 正弦波。 [0017] 請參考第四圖所示三相混合式電力濾波裝置之較佳實施 例之電力轉換器之控制方塊，該二極體箝位式多階電力 轉換器21採電壓控制式，由以上分析得知，該二極體箝 位式多階電力轉換器21之控制方塊包含三個控制迴路， 分別為一諧波抑制迴路40用來產生諧波控制信號、一直 流穩壓控制迴路41用來產生直流穩壓控制信號及一直流 均壓控制迴路42用來產生直流均壓控制信號。該諧波抑 制迴路40包含了一三相電流檢出器400、一三相帶拒濾波 器401與一三相放大器402，該三相電流檢出器400用以 檢出該電源1之三相電流送至該三相帶拒濾波器4 01，而 三相帶拒濾波器401是60Hz帶拒濾波器，用以取出該電源 1三相電流之諧波成份，而此諧波成份再經由該三相放大 器402放大，可獲得該諧波控制信號。該直流穩壓控制迴 路41包含了電壓檢出器410、一減法器411、一比例積分 控制器412、一三相電壓檢出器413、一三相相移電路 098142901 表單編號A0101 第8頁/共17頁 0982073660-0 201121191 ❹ .414及一三相乘法器415，該電壓檢出器410檢出該二極 體箝位式多階電力轉換器21之兩個直流電容211、212之 電壓，該電壓檢出器410内部並計算以輸出一兩個直流電 容211、212之電壓和及一兩個直流電容211、212之電屋 差，將該兩個直流電容211、212之電壓和與其設定值以 該減法器411做相減，相減結果再透過該比例積分控制器 412，該三相電壓檢出器413檢出該電源1之三相電壓，再 經該三相相移電路414產生超前90度之相移，將該比例積 分控制器412與該三相相移電路414之輸出利用該三相乘 法器415相乘便可得到該寒流穩壓控制訊號。該直流均壓 控制迴路42包含一比例積分控制器420，將該電壓檢出器 410輸出之該兩個直流電容211 ' 212之電壓差經由該比 例積分控制器420即可產生直流均壓控制訊號。最後將該 諧波控制信號、該直流穩壓控制信號及該直流均壓控制 信號經一三相加法器4 3相加即可得到一:三相電壓控制信 號，將該二相電麗控制p號送至一三相脈兔調變電路Μ ❹ ，該二相脈寬調變電路44之輸出送至一三相驅動電路45 以產生該二極體箝位式多階-電力轉換器21中各電力電子 開關元件之驅動信號。 [0018] 本發明之二相混合式電力濾波裝置中電力轉換器採用該 二極體箝位式多階電力轉換器21，相較於傳統兩階式電 力轉換器其可提高整體混合式電力濾波裝置之效率降 低電力電子開關之耐受電壓及電磁干擾，並利用該零序 電流迴路22可有效解決該二極體箝位式多階電力轉換器 21之該兩個直流電容211、212之均壓問題。 098142901 表單編號A0HU 第9頁/共17頁 0982073660-0 201121191 [0019] 雖然本發明.已以前述較佳實施例揭示，然其並非用以限 定本螫姻，任何熟悉此被藝者，在不號離本發明之精神 和範圍内，當可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。 【圖式簡單說明】 [0020] 第一圖係傳統主動式電力濾波器之電路架構。 [0021] 第二圖係傳統混合式電力濾波裝置之電路架構。 [0022] 第三圖係本發明三相混合式電力濾波裝置之較佳實施例 之電路架構。 [0023] 第四圖係本發明三相混合式電力濾波裝置之較佳實施例 之電力轉換器之控制方塊。 【主要元件符號說明】 [0024] 1.電源 [0025] 2.混合式電力濾波裝置 [0026] 20.被動式電力濾波器 [0027] 21.二極體箝位式多階電力轉換器 [0028] 21 0 _電力電子開關組 [0029] 211.直流電容 [0030] 21 2.直流電容 [0031] 22.零序電流迴路 [0032] 221·三相端 098142901 表單編號A0101 第10頁/共17頁 0982073660-0 201121191 [0033] 222.中性端 [0034] 223.三相電感器 [0035] 3.負載 [0036] 40.諧波抑制迴路 • [0037] 400.三相電流檢出器 [0038] 401.三相帶拒濾波器 [0039] ❹ 402.三相放大器 [0040] 41.直流穩壓控制迴路 [0041] 410.電壓檢出器 [0042] 411.減法器 [0043] 412.比例積分控制器 [0044] 413.三相電壓檢出器 [0045] 〇 ..: 414.三相相移電路 | > Γ'ΙΠ 1?!一 ί ‘ [0046] %!，-,：» ί ii： 415.三相乘法器 [0047] 42.直流均壓控制迴路 [0048] 420.比例積分控制器 [0049] 43.三相加法器 [0050] 44.三相脈寬調變電路 [0051] 45.三相驅動電路 098142901 表單編號A0101 第11頁/共17頁 0982073660-0 201121191 [0052] 8.主動式電力濾波器 [00^3] 8 0 ·濾波電感 [0054] 81.橋式電力轉換器 [0055] 8 2.儲能電容器 [0056] 9.混合式電力濾波裝置 [0057] 90.被動式電力濾波器 [0058] 91.主動式電力濾波器 0982073660-0 098142901 表單編號A0101 第12頁/共17頁201121191 VI. Description of the invention: [Technical field to which Fenming belongs] [0001] The present invention relates to a power converter of a three-phase hybrid power filter device, which is particularly useful for filtering a three-phase three-wire power distribution system A power converter of a current hybrid power filter device, which uses a diode clamp type multi-step power converter, which can improve the efficiency of the integrated hybrid power filter device and reduce the withstand voltage of the power electronic switch And electromagnetic interference. _ [Prior Art] 〇[0002] In recent years, due to the rapid increase of non-linear load in power distribution systems, a large amount of harmonic current is generated, which causes serious impact on power quality and causes problems in power distribution systems, such as transformer overheating. Rotating motor disturbances, voltage distortion, damage to power components and machine failures. Traditionally, the method of solving the harmonic problem is to use a passive power filter composed of an inductor and a capacitor. However, a passive power chopper can cause vibration problems and cause adjacent chopping current injection problems. 0 causes damage to the passive power filter. In addition, its filtering characteristics are susceptible to system reactance and are difficult to obtain. Good; the filtering effect. [0003] Another method for solving the harmonic problem is to use an active power waver, such as the US patents US 5, 977, 660 and US 5, 321, 598, as shown in the first figure, which discloses a conventional active power filter. Schematic diagram of the circuit. The active power filter 8 includes a filter inductor, a bridge power converter 81 and a storage capacitor 82. The active power filter 8 injects a compensation current into a power feeder to remove harmonic currents generated by the load. Although the active power filter 8 has good filtering characteristics, 098142901 Form No. 1010101 Page 3 of 17 page 0982073660-0 201121191 丨III ^Active Power Filter 8 capacity must be equal to the load harmonics and power pack Therefore, the capacity of the active power filter 8 is so expensive that it is limited in practicality. _ In order to solve the problem of passive power residual resonance, adjacent harmonic current injection & overload problem and the price blame caused by the large capacity of active power filter, a hybrid power filter device has been developed, such as the United States. Patent Nos. 5,657,994 and 5,731,965, etc., refer to the second figure, which discloses that the hybrid power filter device 9 is formed by a passive power filter 90 in combination with an active power filter 91. The passive power filter 90 is used to reduce the capacity of the active power filter 91, and the active power filter 91 is used to improve the filtering effect of the passive power filter 9' and avoid resonance and adjacent harmonic current injection. Such a problem, therefore, the hybrid power filter device can be applied to a non-linear load of a large power capacity as a harmonic filter. However, the efficiency of its integrated hybrid power filter is still limited. [0005] In view of the advantages of the hybrid power filter device having a passive power filter and an active power filter, in the patents US 5, 567, 994 and US 5, When the hybrid power filter device such as 731,965 is applied to the three-phase three-wire power distribution system, the power converters in the active power waver adopt a three-phase bridge architecture. The power electronic switching components used in the three-phase bridge architecture The efficiency of the integrated hybrid power wave device caused by the voltage withstand voltage is still limited. The inventors have further improved the efficiency of the integrated hybrid power filter device and reduced the withstand voltage and electromagnetic interference of the power electronic switch. A hybrid power filter device based on a two-pole clamp type multi-stage power conversion 098142901 Form No. A0101 Page 4 / 17 page 0982073660-0 201121191, which has the advantages of improving the efficiency of the integrated hybrid power filter device. It can also reduce the withstand voltage of power electronic switches and reduce the advantages of electromagnetic interference. [0006] The technical means used in the present invention is to design a three-phase hybrid power filter device, which is connected in parallel to a power system and a load; the hybrid power filter device includes: [0007] a passive power source a filter; [0008] a diode clamped multi-order power converter in series with the passive power filter; [0009] - a zero sequence current loop, and the diode clamped multi-level power converter [0010] The hybrid power filter device generates a compensation current injected into the power system to offset the harmonic current generated by the load, so that the current of the power system tends to be sinusoidal. [0011] The above and other objects, features and advantages of the present invention will become more <RTIgt; Referring to the third figure, a preferred embodiment of the three-phase hybrid power filter device of the present invention is disclosed. The power source 1 supplies a three-phase power to the load 3. The hybrid power filter device 2 and the The load 3 is connected in parallel to filter out the harmonic current generated by the load 3. [0013] Please refer to the third embodiment of the three-phase hybrid power filter device as shown in the third figure. 098142901 Form No. 1010101 Page 5 / Total 17 Page 0982073660-0 201121191 Fine * Example ° Hai / tti combined power chopper device 2 The passive power filter 20 is composed of an inductor and a capacitor. The passive power filter 20 is composed of an inductor and a capacitor. The passive power filter 20 is connected in series with a two-pole clamped multi-step power converter 21 and electrically connected to a sequencing current loop 22 . One or more sets of three-phase single-tuned power filters, the single-tuned power filter is selected to be tuned to the main harmonic frequency of the load, and most of the fundamental wave components of the voltage of the power supply are reduced to the passive power filter. 20. Therefore, the passive power filter 2 can reduce the power capacity of the diode-clamped multi-step power converter 21. [0014] The diode-clamped multi-step power converter 21 comprises a power electronic switch group 21 and two DC capacitors 2 U, 212, and the power electronic switch group 2 includes two DC terminals (+, N and a), (a three-arm power electronic switch group and two parent current terminals (A, B, C), the diode-type multi-stage power converter 21 is a conventional diode clamp Multi-step power converter, the three-arm power electronic switch group includes three power electronic switch arms, each arm power electronic switch includes four power electronic switch groups and two clamp diodes, the four power electronics The switch groups are connected in series, and each power electronic switch group is connected in parallel by a power electronic switch friend-diode, the two DC capacitors 211, 212 are connected in series, and the two DC capacitors 211, 212 have the same capacitance value, the two The two ends of the DC capacitors 211, 21 2 and their series contacts are respectively connected to the three DC terminals (+, - and N) of the power electronic switch group 21'. The three AC terminals of the power electronic switch group 21〇 (a, B, c) is connected to the passive power filter 20. The zero The current loop 22 includes a set of three-phase ends (221) and a neutral end (222) and a three-phase inductor (223). The three-phase end (221) includes three points, and the β-half phase end (2 21 The three terminals are respectively connected to the diode 098142901. Form number Α 0101 Page 6 / Total 17 page 0982073660-0 [0015] 201121191 - The bit type multi-stage power converter 21. The power electronic switch group 21 0 The three AC terminals (A, B, C)' and the neutral terminal (222) of the zero sequence current loop 22 are connected to the two DC capacitors 211, 212 series contacts and the DC of the power electronic switch group 210 Terminal N. [0016] The three-phase inductor (223) includes three inductors, one of the three inductors forming a three-phase terminal 221 of the zero-sequence current loop 22, and the other ends of the three inductors are mutually Connected together to form the neutral terminal 2 2 2 of the zero sequence current loop 22. The two DC capacitors 211, 212 establish two DC voltages, 0 which are much smaller than the peak value of the voltage of the power source 1, and the The power electronic switch group 210 switches the DC voltages established by the two DC capacitors 211 and 212 to generate a compensation voltage. The compensation voltage generated by the diode clamp type multi-level power converter 21 is used to improve the filtering effect of the passive power filter 2, and protect the passive power filter 2 from resonance and adjacent spectrum current injection. The normal operation of the diode clamp-position multi-stage power converter 21 depends on the two: the DC capacitors 211, 212 generate two equal DC voltages 'however by the two DC capacitors 211, 212 〇, due to manufacturing error, the capacitance value can not be exactly the same, or due to the transient state of load 3, it may cause the DC voltage generated by the two DC capacitors 211, 212 to be inequality, and the diode clamp When the bit type multi-step power converter 21 is applied to the hybrid power filter device 2, since the passive power chopper 20 is a single tuned power filter, each phase of the single tuned power filter consists of an inductor and a The capacitors are connected in series, so the passive power chopper 20 includes a capacitor in each phase, and the capacitors will block the direct current, resulting in the diode-clamped multi-step power converter 2 1 can not use a small DC current to achieve the two DC power 098142901 Form No. Α 0101 Page 7 / Total 17 page 0982073660-0 201121191, the capacitance of 211, 212, so the two-pole clamp multi-level power conversion: 3⁄4: Force 21 requires a zero-sequence current loop 22, and the zero-sequence current loop 22 is used to flow a small direct current to achieve the equalization of the two DC capacitors 211, 212 due to the zero-sequence current loop 22 Only a small DC current flows, and its terminal voltage is the voltage of the two DC capacitors 211, 212, which is much smaller than the peak value of the voltage of the power source 1, so its volume is very small. The hybrid power filter device 2 generates a three-phase compensation current through the control of the diode-type multi-step power converter 21, and the three-phase compensation current is injected into the power feeder of the power source 1 to make the power source 1 The three-phase currents supplied tend to be sinusoidal. [0017] Please refer to the control block of the power converter of the preferred embodiment of the three-phase hybrid power filter device shown in FIG. 4, the diode clamp type multi-step power converter 21 adopts a voltage control type, and the above It is found that the control block of the two-pole clamp multi-level power converter 21 includes three control loops, one for the harmonic suppression loop 40 for generating the harmonic control signal, and the DC regulator control loop 41. The DC voltage stabilization control signal and the DC current equalization control circuit 42 are used to generate a DC voltage equalization control signal. The harmonic suppression circuit 40 includes a three-phase current detector 400, a three-phase band rejection filter 401 and a three-phase amplifier 402. The three-phase current detector 400 is used to detect the three phases of the power source 1. The current is sent to the three-phase rejection filter 410, and the three-phase rejection filter 401 is a 60Hz rejection filter for extracting harmonic components of the three-phase current of the power supply 1, and the harmonic component is further The three-phase amplifier 402 is amplified to obtain the harmonic control signal. The DC voltage regulator control circuit 41 includes a voltage detector 410, a subtractor 411, a proportional integral controller 412, a three-phase voltage detector 413, and a three-phase phase shift circuit 098142901. Form No. A0101 Page 8 / A total of 17 pages 0982073660-0 201121191 ❹ .414 and a three-phase multiplier 415, the voltage detector 410 detects the voltages of the two DC capacitors 211, 212 of the diode-clamped multi-stage power converter 21. The voltage detector 410 internally calculates and calculates the voltage of one or two DC capacitors 211 and 212 and the electrical difference between one or two DC capacitors 211 and 212, and the voltages of the two DC capacitors 211 and 212 and The set value is subtracted by the subtracter 411, and the subtraction result is transmitted through the proportional integral controller 412. The three-phase voltage detector 413 detects the three-phase voltage of the power source 1 and passes through the three-phase phase shift circuit 414. A phase shift of 90 degrees is generated, and the output of the proportional integral controller 412 and the three-phase phase shift circuit 414 is multiplied by the three-phase multiplier 415 to obtain the cold current regulation control signal. The DC voltage equalization control circuit 42 includes a proportional integral controller 420, and the voltage difference between the two DC capacitors 211 '212 outputted by the voltage detector 410 is generated by the proportional integral controller 420 to generate a DC voltage equalization control signal. . Finally, the harmonic control signal, the DC voltage stabilization control signal and the DC voltage equalization control signal are added by a three-phase adder 43 to obtain a three-phase voltage control signal, and the two-phase electric control is controlled. The p number is sent to a three-phase pulse rabbit modulation circuit Μ , and the output of the two-phase pulse width modulation circuit 44 is sent to a three-phase driving circuit 45 to generate the two-pole clamp multi-stage power conversion The drive signal of each power electronic switching element in the device 21. [0018] The power converter of the two-phase hybrid power filter device of the present invention adopts the two-pole clamp type multi-step power converter 21, which can improve the overall hybrid power filter compared with the conventional two-step power converter. The efficiency of the device reduces the withstand voltage and electromagnetic interference of the power electronic switch, and the zero-sequence current loop 22 can effectively solve the two DC capacitors 211 and 212 of the diode-clamped multi-stage power converter 21 Pressure problem. 098142901 Form No. A0HU Page 9 of 17 0982073660-0 201121191 [0019] Although the present invention has been disclosed in the foregoing preferred embodiments, it is not intended to limit the marriage, any person familiar with the art, The scope of the present invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS [0020] The first figure is a circuit architecture of a conventional active power filter. [0021] The second figure is a circuit architecture of a conventional hybrid power filter device. [0022] The third figure is a circuit architecture of a preferred embodiment of the three-phase hybrid power filter device of the present invention. [0023] The fourth figure is a control block of a power converter of a preferred embodiment of the three-phase hybrid power filter device of the present invention. [Main component symbol description] [0024] 1. Power supply [0025] 2. Hybrid power filter device [0026] 20. Passive power filter [0027] 21. Diode clamp type multi-step power converter [0028] 21 0 _Power electronic switch group [0029] 211. DC capacitor [0030] 21 2. DC capacitor [0031] 22. Zero-sequence current loop [0032] 221· Three-phase terminal 098142901 Form No. A0101 Page 10 of 17 0982073660-0 201121191 [0033] 222. Neutral end [0034] 223. Three-phase inductor [0035] 3. Load [0036] 40. Harmonic suppression loop • [0037] 400. Three-phase current detector [0038] 401. Three-phase band rejection filter [0039] ❹ 402. Three-phase amplifier [0040] 41. DC voltage regulation control loop [0041] 410. Voltage detector [0042] 411. Subtractor [0043] 412. Proportion Integral controller [0044] 413. Three-phase voltage detector [0045] 〇..: 414. Three-phase phase shift circuit | > Γ'ΙΠ 1?! a ί ' [0046] %!,-,:» ί ii: 415. Three-phase multiplier [0047] 42. DC voltage equalization control loop [0048] 420. Proportional integral controller [0049] 43. Three-phase adder [0050] 44. Three-phase pulse width modulation Circuit [0051] 45. Three-phase drive Circuit 098142901 Form No. A0101 Page 11 of 17 0982073660-0 201121191 [0052] 8. Active Power Filter [00^3] 8 0 · Filter Inductor [0054] 81. Bridge Power Converter [0055] 8 2. Energy storage capacitor [0056] 9. Hybrid power filter device [0057] 90. Passive power filter [0058] 91. Active power filter 0992073660-0 098142901 Form number A0101 Page 12 of 17