JP2005341634A - Control method of inverter apparatus - Google Patents

Control method of inverter apparatus Download PDF

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JP2005341634A
JP2005341634A JP2004152881A JP2004152881A JP2005341634A JP 2005341634 A JP2005341634 A JP 2005341634A JP 2004152881 A JP2004152881 A JP 2004152881A JP 2004152881 A JP2004152881 A JP 2004152881A JP 2005341634 A JP2005341634 A JP 2005341634A
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output power
power value
inverter
determined
range
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JP4575026B2 (en
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Seiya Abe
晴也 安部
Koichi Kishida
耕一 岸田
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Daihen Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method for eliminating the operation of an inverter apparatus within a low conversion efficiency range and efficiently supplying AC power converted into a system power supply, even if the output power value becomes low. <P>SOLUTION: In a power supply system, a plurality of the inverter apparatuses are connected to a DC power supply in parallel, an output power value from the DC power supply is calculated for a predetermined period, the number of the activated inverter apparatuses is determined from the output power value, and the inverter apparatuses are thus operated. In the control method of the inverter apparatus, the number of the activated inverter apparatuses is set to the number at (n-1)th time, at the time of the termination of the n-th period within an output power range determined, in response to the output power value calculated at the n-th time and the number of the inverter apparatuses determined at the (n-1)th time. If the power output lies out of the range, the number of the activated inverter apparatuses is determined again, based on the output power value at the n-th time and a high conversion efficiency input power value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、太陽電池等の直流電源からの直流出力をインバータで交流出力に変換して交流系統に供給する電源システムに係り、特に直流出力の変換を高効率で運転するための技術に関するものである。   The present invention relates to a power supply system that converts a direct current output from a direct current power source such as a solar battery into an alternating current output by an inverter and supplies the alternating current output to an alternating current system, and particularly relates to a technique for operating the conversion of direct current output with high efficiency. is there.

図５は、従来技術の電源システムのブロック図である。同図において、電源システムは、太陽電池からなる直流電源ＤＣと、上記直流電源ＤＣに並列接続されて直流出力をインバータで交流出力に変換して出力する第１インバータ装置ＰＳ１乃至第ｎインバータ装置ＰＳｎと、上記直流電源ＤＣからの出力電力値を検出する電力検出部ＤＳと、上記各インバータ装置を上記出力電力値に基づいて制御する出力制御部ＳＡと、上記直流電源ＤＣに接続された上記各インバータ装置を開閉する開閉器ＳＷ１乃至開閉器ＳＷｎとから形成されている。   FIG. 5 is a block diagram of a conventional power supply system. In the figure, the power supply system includes a direct current power source DC composed of solar cells, and a first inverter device PS1 to an nth inverter device PSn that are connected in parallel to the direct current power source DC and convert a direct current output into an alternating current output by an inverter. A power detection unit DS that detects an output power value from the DC power source DC, an output control unit SA that controls the inverter devices based on the output power value, and each of the above-described DC power sources DC. The switches SW1 to SWn that open and close the inverter device are formed.

図５に示す、第１インバータ装置ＰＳ１は、第１インバータ制御回路ＣＯ１と第１インバータ回路ＰＣ１とで形成され、第２インバータ装置ＰＳ２は、第２インバータ制御回路ＣＯ１と第２インバータ回路ＰＣ１とで形成され、第ｎインバータ装置ＰＳｎは、第ｎインバータ制御回路ＣＯｎと第ｎインバータ回路ＰＣｎとで形成されている。   The first inverter device PS1 shown in FIG. 5 is formed by the first inverter control circuit CO1 and the first inverter circuit PC1, and the second inverter device PS2 is formed by the second inverter control circuit CO1 and the second inverter circuit PC1. The n-th inverter device PSn is formed by an n-th inverter control circuit CON and an n-th inverter circuit PCn.

第１インバータ制御回路ＣＯ１は、出力制御部ＳＡから起動信号が入力すると動作を開始し、第１開閉器ＳＷ１を閉路して第１インバータ回路ＰＣ１に直流電源ＤＣからの出力電力を供給し、かつ、第１インバータ回路ＰＣ１を起動させて直流電圧を交流電圧に変換して系統電源ＡＣに供給する。第２インバータ制御回路ＣＯ２乃至第ｎインバータ制御回路ＣＯｎも上記と同一動作を行なう。   The first inverter control circuit CO1 starts operation when the activation signal is input from the output control unit SA, closes the first switch SW1, supplies the output power from the DC power source DC to the first inverter circuit PC1, and The first inverter circuit PC1 is activated to convert the DC voltage into an AC voltage and supply it to the system power supply AC. The second inverter control circuit CO2 to the nth inverter control circuit CON also perform the same operation as described above.

電力検出部ＤＳは、直流電源ＤＣからの出力電力値を検出して出力制御部ＳＡに入力する。上記出力制御部ＳＡは、出力電力演算部ＰＡとインバータ選択部ＣＨとで形成され、上記出力電力演算部ＰＡは、上記出力電力値に基づいてインバータ装置の起動台数を決定する。上記インバータ選択部ＣＨは、上記決定された起動台数に基づいて、各インバータ装置に起動信号を入力する。   The power detector DS detects the output power value from the DC power source DC and inputs it to the output controller SA. The output control unit SA is formed of an output power calculation unit PA and an inverter selection unit CH, and the output power calculation unit PA determines the number of inverter devices to be started based on the output power value. The inverter selection unit CH inputs a start signal to each inverter device based on the determined start number.

特許文献１に記載する従来技術は、図５に示す従来技術の電源システムのインバータ装置１台あたりの最大入力電力値を（定格入力電力値／最大変換効率）で算出し、出力電力値≦（最大入力電力値×ｎ）より起動台数を決定するので、日射強度が曇り等によって低下して、上記出力電力値が低くなっても変換効率の高い状態で起動台数ｎを決定することかできる。例えば、定格入力電力値１００ＫＷ、最大変換効率９５％とすると、上記最大入力電力値は１０５ＫＷとなる。このときに上記出力電力値が２７０ＫＷから１２０ＫＷに低下すると、上記インバータ装置の起動台数が３台から２台に減少し、上記インバータ装置１台の入力電力値が９０ＫＷから６０ＫＷに減少する、しかし、インバータ装置の変換効率を考慮して起動台数を決定しているので、上記出力電力値が低下しても図２に示すインバータ装置の定格入力電力の１０％（１０ＫＷ）以下の低変換効率範囲で動作することがなく、上記出力電力値を無駄なく交流電力に変換できる。   The prior art described in Patent Document 1 calculates the maximum input power value per inverter device of the power supply system of the prior art shown in FIG. 5 by (rated input power value / maximum conversion efficiency), and the output power value ≦ ( Since the startup number is determined from the maximum input power value × n), it is possible to determine the startup number n with high conversion efficiency even when the solar radiation intensity decreases due to cloudiness or the like and the output power value decreases. For example, if the rated input power value is 100 KW and the maximum conversion efficiency is 95%, the maximum input power value is 105 KW. When the output power value is reduced from 270 KW to 120 KW at this time, the number of inverter devices started up is reduced from three to two, and the input power value of one inverter device is reduced from 90 KW to 60 KW. Since the number of starting units is determined in consideration of the conversion efficiency of the inverter device, even if the output power value is reduced, the conversion efficiency range is 10% (10 kW) or less of the rated input power of the inverter device shown in FIG. Without operation, the output power value can be converted into AC power without waste.

特開平８−３３２１１号公報JP-A-8-33211

上述の特許文献１の従来技術を適用すると、出力電力値が低下して小さくなっても、図２に示すようにインバータ装置が定格入力電力値の１０％以下の低変換効率範囲で動作することが無くなり、上記出力電力値を無駄なく交流電力に変換できる。しかし、上記特許文献１の従来技術の出力電力範囲の値は（定格入力電力値／最大変換効率）で決定され、上記出力電力値に急激な変化が生じて上記出力電力範囲外になったとき、図５に示す開閉器の開閉台数とインバータ装置の起動台数とが変化し、上記開閉器及び上記インバータ装置の寿命を短くしてしまう。   When the conventional technique of Patent Document 1 described above is applied, even if the output power value decreases and decreases, the inverter device operates in a low conversion efficiency range of 10% or less of the rated input power value as shown in FIG. The output power value can be converted into AC power without waste. However, the value of the output power range of the prior art of Patent Document 1 is determined by (rated input power value / maximum conversion efficiency), and when the output power value suddenly changes and falls outside the output power range. 5 changes the number of switches opened and closed and the number of inverter devices started, which shortens the life of the switches and the inverter devices.

図６は時間と出力電力値との関係を示すタイミング図である。同図において、時刻ｔ＝ｔ０〜ｔ８の期間において、時間が経過するとともに上記出力電力値が増加し、時刻ｔ＝ｔ８以後は減少する。例えば、時刻ｔ＝ｔ４において、上記出力電力値が増加して上記出力電力範囲を超えたときに、インバータ装置の起動台数は４台から５台に増加する。しかし、時刻ｔ＝ｔ５付近において、上記出力電力値に急激な変化が生じ減少及び増加がおこり上記出力電力範囲外になったとき、図６に示すようにインバータ装置の起動台数は５台から４台に減少し、続いて、４台から６台に増加する。このために、図５に示す開閉器の開閉回数とインバータ装置の起動回数とが増加して上記開閉器及び上記インバータ装置の寿命を短くしてしまう。   FIG. 6 is a timing chart showing the relationship between time and output power value. In the figure, in the period from time t = t0 to t8, the output power value increases as time elapses and decreases after time t = t8. For example, when the output power value increases and exceeds the output power range at time t = t4, the number of inverter devices started up increases from four to five. However, when the output power value suddenly changes and decreases and increases around time t = t5 and falls outside the output power range, the number of inverter devices started up from 5 to 4 as shown in FIG. The number will decrease to 4 and then increase from 4 to 6. For this reason, the number of times of opening / closing of the switch and the number of times of activation of the inverter device shown in FIG. 5 increase, thereby shortening the life of the switch and the inverter device.

そこで、本発明は、上述した課題を解決することができるインバータ装置の制御方法を提供することにある。   Then, this invention is providing the control method of the inverter apparatus which can solve the subject mentioned above.

上述した課題を解決するために、直流電源に複数台のインバータ装置を並列接続し、上記直流電源からの出力電力値を予め定めた周期で算出し、上記周期ごとの出力電力値に基づいて上記インバータ装置の起動台数を決定して運転する電源システムにおいて、第１回目の周期終了時は、第１回目に算出された上記出力電力値と上記インバータ装置の変換効率が高い範囲内で予め定めた高変換効率入力電力値に基づいて起動台数を決定し、第２回目の周期終了時は、第２回目に算出された上記出力電力値が第１回目に決定された起動台数に応じて定まる出力電力範囲内のときには第１回目の起動台数を維持し、上記出力電力範囲外のときには上記第２回目の出力電力値と上記高変換効率入力電力値に基づいて再度起動台数を決定し、続いて、第ｎ回目の周期終了時は、第ｎ回目に算出された出力電力値と第ｎ−１回目に決定された起動台数に応じて定まる出力電力範囲内のときには第ｎ−１回目の起動台数を維持し、上記出力電力範囲外のときには上記第ｎ回目の出力電力値と上記高変換効率入力電力値に基づいて再度起動台数を決定し、以後、上記と同一処理を繰り返すことを特徴とするインバータ装置の制御方法である。   In order to solve the above-described problem, a plurality of inverter devices are connected in parallel to a DC power source, an output power value from the DC power source is calculated at a predetermined cycle, and the above-described output power value for each cycle is In the power supply system that operates by determining the number of inverter devices to be started, at the end of the first cycle, the output power value calculated in the first time and the conversion efficiency of the inverter device are set within a high range. The number of startups is determined based on the high conversion efficiency input power value, and at the end of the second cycle, the output power value calculated at the second time is determined according to the startup number determined at the first time When the number is within the power range, the first number of startups is maintained. When the number is outside the output power range, the number of startups is determined again based on the second output power value and the high conversion efficiency input power value. The second At the end of the cycle, when the output power value is determined according to the output power value calculated for the nth time and the number of startups determined for the (n-1) th time, the (n-1) th startup number is maintained. When the number of start-ups is determined again based on the n-th output power value and the high conversion efficiency input power value when out of the output power range, the same processing is repeated thereafter. It is a control method.

第２の発明の上記高変換効率入力電力値は、上記インバータ装置の変換効率が高い範囲内でありかつ上記インバータ装置の定格入力電力値の１／２を中心値とする所定範囲で予め定めた値であり、上記出力電力範囲は上記高変換効率入力電力値と上記インバータ装置の起動台数との乗算値を中心値とする所定範囲であることを特徴とする請求項１記載のインバータ装置の制御方法である。   The high conversion efficiency input power value of the second aspect of the invention is predetermined within a predetermined range in which the conversion efficiency of the inverter device is within a high range and the center value is 1/2 of the rated input power value of the inverter device. 2. The control of an inverter device according to claim 1, wherein the output power range is a predetermined range centered on a product of the high conversion efficiency input power value and the number of activated inverter devices. Is the method.

上記第１の発明によれば、上記直流電源ＤＣからの出力電力値が低くなっても、インバータ装置の変換効率を考慮した高変換効率の入力電力値と上記出力電力値とに基づいて起動台数を決定しているので、上記出力電力値が低くなっても上記インバータ装置が低変換効率範囲で運転することがなくなり、系統電源に変換された交流電力が効率よく供給できる。   According to the first aspect of the invention, even if the output power value from the DC power supply DC is low, the number of starting units is based on the input power value with high conversion efficiency considering the conversion efficiency of the inverter device and the output power value. Therefore, even if the output power value decreases, the inverter device does not operate in the low conversion efficiency range, and the AC power converted to the system power supply can be supplied efficiently.

第２の発明によれば、出力電力範囲はインバータ装置の起動台数の増加に応じて広くなる。上記より出力電力値が大きいほど上記出力電力範囲は広くなる。この領域で上記出力電力値に急激な変動が生じても出力電力値の変動値が上記広くなった出力電力範囲外になることは極めて少なく、上記出力電力値の急激な変動に応じてインバータ装置の起動台数が変化することが減少し、電源システムを形成している開閉器及びインバータ装置の寿命が延びる。   According to the second invention, the output power range becomes wider as the number of inverter devices started increases. The output power range becomes wider as the output power value is larger than the above. Even if a sudden fluctuation occurs in the output power value in this region, the fluctuation value of the output power value is very rarely outside the widened output power range, and the inverter device according to the sudden fluctuation of the output power value. The change in the number of start-ups is reduced, and the lifespan of the switches and inverters forming the power supply system is extended.

［実施の形態１］
図１は、本発明の実施の形態の電源システムのブロック図である。同図において、図５に示す、従来技術の電源システムのブロック図と同一符号は同一動作を行なうので説明は省略し符号が相違する構成について説明する。 [Embodiment 1]
FIG. 1 is a block diagram of a power supply system according to an embodiment of the present invention. In the figure, the same reference numerals as those in the block diagram of the conventional power supply system shown in FIG.

図１において、電源システムは、太陽電池からなる直流電源ＤＣと、上記直流電源ＤＣに並列接続されて直流出力をインバータで交流出力に変換して出力する第１インバータ装置ＰＳ１乃至第ｎインバータ装置ＰＳｎと、上記直流電源ＤＣからの出力電力値を検出する電力検出部ＤＳと、上記各インバータ装置を上記出力電力値に基づいて制御する出力台数制御部ＳＫと、上記直流電源ＤＣに接続された上記直流電源ＤＣからの出力電力を開閉する開閉器ＳＷ１乃至開閉器ＳＷｎとから形成されている。   In FIG. 1, the power supply system includes a direct current power source DC composed of solar cells, and a first inverter device PS1 to an nth inverter device PSn that are connected in parallel to the direct current power source DC and convert a direct current output into an alternating current output by an inverter. A power detection unit DS that detects an output power value from the DC power source DC, an output number control unit SK that controls the inverter devices based on the output power value, and the DC power source DC connected to the DC power source DC. The switches SW1 to SWn that open and close the output power from the DC power source DC are formed.

電力検出部ＤＳは、直流電源ＤＣからの出力電力値を検出して出力台数制御部ＳＫに入力する。上記出力台数制御部ＳＫは、台数演算部ＮＡとインバータ選択部ＣＨとで形成され、上記台数演算部ＮＡは、周期ごとの出力電力値と予め定めた高変換率入力電力値に基づいて起動台数を決定し、かつ上記起動台数に応じて出力電力範囲を決定する。上記インバータ選択部ＣＨは、上記決定された起動台数に基づいて、各インバータ装置に起動信号を入力する。   The power detection unit DS detects the output power value from the DC power source DC and inputs it to the output number control unit SK. The output number control unit SK is formed by a number calculation unit NA and an inverter selection unit CH. The number calculation unit NA is based on the output power value for each cycle and a predetermined high conversion rate input power value. And the output power range is determined in accordance with the number of startups. The inverter selection unit CH inputs a start signal to each inverter device based on the determined start number.

第１インバータ制御回路ＣＯ１は、出力台数制御部ＳＫから起動信号が入力すると動作を開始し、第１開閉器ＳＷ１を閉路して第１インバータ回路ＰＣ１に直流電源ＤＣからの出力電力を供給し、かつ、第１インバータ回路ＰＣ１を起動させて直流電圧を交流電圧に変換して系統電源ＡＣに供給する。第２インバータ制御回路ＣＯ２及び第ｎインバータ制御回路ＣＯｎも上記と同一動作を行なう。また、本発明では電源システムのインバータ装置の接続台数を５台に想定して説明する。   The first inverter control circuit CO1 starts operation when a start signal is input from the output number control unit SK, closes the first switch SW1, and supplies output power from the DC power source DC to the first inverter circuit PC1. Further, the first inverter circuit PC1 is activated to convert the DC voltage into an AC voltage and supply it to the system power supply AC. The second inverter control circuit CO2 and the nth inverter control circuit CON also perform the same operation as described above. In the present invention, the number of connected inverter devices in the power supply system is assumed to be five.

次に、本発明の実施の形態の動作を、図２に示すインバータ装置の入力−変換効率特性図と図３に示すフローチャートとを参照して説明する。   Next, the operation of the embodiment of the present invention will be described with reference to the input-conversion efficiency characteristic diagram of the inverter device shown in FIG. 2 and the flowchart shown in FIG.

図３に示すステップ１００において、直流電源ＤＳから検出される周期ごとの第１回目の出力を計測して第１回目の出力電力値として算出する。   In step 100 shown in FIG. 3, the first output for each cycle detected from the DC power source DS is measured and calculated as the first output power value.

ステップ２００において、本発明のインバータ装置の定格入力電力が、例えば、１００ＫＷのインバータ装置であって、図２に示す、変換効率が高い範囲内であって高変換効率率入力電力値が６０ＫＷとする。そして、上記算出した第１回目の出力電力値を上記高変換効率入力電力値の６０ＫＷで除算して第１回目のインバータ装置の起動台数ｎを決定する。   In step 200, the rated input power of the inverter device of the present invention is, for example, an inverter device of 100 kW, and the conversion efficiency is within a high range shown in FIG. 2, and the high conversion efficiency rate input power value is 60 kW. . Then, the calculated first output power value is divided by the high conversion efficiency input power value of 60 KW to determine the first startup number n of inverter devices.

ステップ３００において、変換効率が高い範囲で、図２より、定格入力電力１００ＫＷの４０％〜９０％のとき、出力電力範囲は下記に示す式
１００ｎ×（０．４〜０．９）
より算出し、第１回目の出力電力範囲を（４０ｎＫＷ〜９０ｎＫＷ）とする。また、図２に示す定格入力電力の４０％〜９０％は、変換効率が９２％〜９４％と高い変換効率を維持している。 In step 300, when the conversion efficiency is high and from 40% to 90% of the rated input power of 100 KW from FIG. 2, the output power range is an expression shown below.
100 nx (0.4-0.9)
And the first output power range is (40 nKW to 90 nKW). Further, 40% to 90% of the rated input power shown in FIG. 2 maintains a high conversion efficiency of 92% to 94%.

ステップ４００において、直流電源ＤＳから検出される周期ごとの第２回目の出力を計測して第２回目の出力電力値として算出する。   In step 400, the second output for each period detected from the DC power source DS is measured and calculated as the second output power value.

ステップ５００において、第２回目に算出された出力電力値と第１回目に決定された起動台数ｎに応じた出力電力範囲（４０ｎＫＷ〜９０ｎＫＷ）とを比較し、上記第２回目の出力電力値が上記第１回目の出力電力範囲内のときにはステップ６００に進み、上記出力電力範囲外のときにはステップ７００に進む。   In step 500, the output power value calculated at the second time is compared with the output power range (40 nKW to 90 nKW) corresponding to the number n of startups determined at the first time, and the second output power value is When it is within the first output power range, the process proceeds to step 600, and when it is outside the output power range, the process proceeds to step 700.

ステップ６００において、上記第２回目の出力電力値が上記第１回目の出力電力範囲（４０ｎＫＷ〜９０ｎＫＷ）内であるので、上記第１回目に決定された起動台数ｎを維持してステップ８００に進む。   In step 600, since the second output power value is within the first output power range (40 nKW to 90 nKW), the number n of startups determined in the first time is maintained, and the process proceeds to step 800. .

ステップ７００において、上記第２回目の出力電力値が上記第１回目の出力電力範囲（４０ｎＫＷ〜９０ｎＫＷ）外のときには、上記第２回目に算出した出力電力値を上記高変換効率入力電力値の６０ＫＷで除算して再度起動台数ｎを決定する。   In step 700, when the second output power value is outside the first output power range (40 nKW to 90 nKW), the second calculated output power value is set to 60 KW of the high conversion efficiency input power value. Divide by to determine the number of startups n again.

ステップ８００において、
１００ｎ×（０．４〜０．９）
の式に、上記再度決定した起動台数ｎを入力して第２回目の出力電力範囲を算出する。 In step 800,
100 nx (0.4-0.9)
The second determined output power range is calculated by inputting the re-started number n in the above equation.

以上でルーチンが終了し、電源システムの動作が終了するまで、以後上記ステップ４００〜ステップ８００のルーチンを繰り返す。   The routine from step 400 to step 800 is repeated thereafter until the routine is finished and the operation of the power supply system is finished.

上述したように、上記周期ごとの出力電力値を上記インバータ装置の高変換効率入力電力値で除算して起動台数を決定しているので、日射強度が曇り等によって低下して、上記出力電力値が低くなっても、図２に示す、低変換効率範囲で運転されることがなくなる。   As described above, since the number of starting units is determined by dividing the output power value for each cycle by the high conversion efficiency input power value of the inverter device, the solar radiation intensity decreases due to clouding or the like, and the output power value 2 is not operated in the low conversion efficiency range shown in FIG.

図４は、時間と出力電力値との関係を示すタイミング図である。同図において、上記出力電力範囲は、１００ｎ×（０．４〜０．９）の式より算出しているので、上記インバータ装置の起動台数の増加に応じて出力電力範囲が広くなる。上記より図４に示す時刻ｔ＝ｔ５において、上記出力電力値に急激な変動が生じても、上記広くなった出力電力範囲の
効果によって上記インバータ装置の起動台数が変化することが減少する。また、時刻ｔ＝ｔ６において、上記出力電力範囲はさらに広くなる。 FIG. 4 is a timing chart showing the relationship between time and output power value. In the figure, since the output power range is calculated from the equation of 100n × (0.4 to 0.9), the output power range becomes wider as the number of inverter devices started increases. From the above, even when the output power value fluctuates suddenly at time t = t5 shown in FIG. 4, the number of inverter devices started up is reduced due to the effect of the widened output power range. Further, at time t = t6, the output power range is further widened.

本発明の実施形態に係る太陽電池の電源システムのブロック図である。It is a block diagram of the power supply system of the solar cell which concerns on embodiment of this invention. インバータ装置の入力−変換効率特性を示す線図である。It is a diagram which shows the input-conversion efficiency characteristic of an inverter apparatus. 本発明の実施の形態の動作を説明するフローチャートである。It is a flowchart explaining operation | movement of embodiment of this invention. 本発明の動作を説明するタイミング図である。It is a timing diagram explaining operation | movement of this invention. 従来技術の太陽電池の電源システムのブロック図である。It is a block diagram of the power supply system of the solar cell of a prior art. 従来技術の動作を説明するタイミング図である。It is a timing diagram explaining operation | movement of a prior art.

符号の説明Explanation of symbols

ＡＣ 交流系統
ＣＨ インバータ選択部
ＣＯ１ 第１インバータ制御回路
ＣＯ２ 第２インバータ制御回路
ＣＯｎ 第ｎ３インバータ制御回路
ＤＣ 直流電源（太陽電池）
ＤＳ 電力検出部
ＮＡ 台数演算部
ＰＡ 出力電力演算部
ＰＣ１ 第１インバータ回路
ＰＣ２ 第２インバータ回路
ＰＣｎ 第ｎインバータ回路
ＰＳ１ 第１インバータ装置
ＰＳ２ 第２インバータ装置
ＰＳｎ 第ｎインバータ装置
ＳＡ 出力制御部
ＳＫ 出力台数制御部
ＳＷ１ 第１開閉器
ＳＷ２ 第２開閉器
ＳＷ３ 第３開閉器
ＳＷ４ 第４開閉器
ＳＷｎ−１ 第ｎ−１開閉器
ＳＷｎ 第ｎ開閉器
































AC AC system CH Inverter selection unit CO1 First inverter control circuit CO2 Second inverter control circuit CONn n3 inverter control circuit DC DC power supply (solar cell)
DS power detection unit NA number calculation unit PA output power calculation unit PC1 first inverter circuit PC2 second inverter circuit PCn nth inverter circuit PS1 first inverter device PS2 second inverter device PSn nth inverter device SA output control unit SK number of outputs Control part SW1 1st switch SW2 2nd switch SW3 3rd switch SW4 4th switch SWn-1 n-1 switch SWn nth switch
































Claims (2)

直流電源に複数台のインバータ装置を並列接続し、前記直流電源からの出力電力値を予め定めた周期で算出し、前記周期ごとの出力電力値に基づいて前記インバータ装置の起動台数を決定して運転する電源システムにおいて、第１回目の周期終了時は、第１回目に算出された前記出力電力値と前記インバータ装置の変換効率が高い範囲内で予め定めた高変換効率入力電力値に基づいて起動台数を決定し、第２回目の周期終了時は、第２回目に算出された前記出力電力値が第１回目に決定された起動台数に応じて定まる出力電力範囲内のときには第１回目の起動台数を維持し、前記出力電力範囲外のときには前記第２回目の出力電力値と前記高変換効率入力電力値に基づいて再度起動台数を決定し、続いて、第ｎ回目の周期終了時は、第ｎ回目に算出された出力電力値と第ｎ−１回目に決定された起動台数に応じて定まる出力電力範囲内のときには第ｎ−１回目の起動台数を維持し、前記出力電力範囲外のときには前記第ｎ回目の出力電力値と前記高変換効率入力電力値に基づいて再度起動台数を決定し、以後、前記と同一処理を繰り返すことを特徴とするインバータ装置の制御方法。   A plurality of inverter devices are connected in parallel to the DC power source, the output power value from the DC power source is calculated at a predetermined cycle, and the number of inverter devices started is determined based on the output power value for each cycle. In the operating power supply system, at the end of the first cycle, based on the output power value calculated at the first time and a high conversion efficiency input power value determined in advance within a range in which the conversion efficiency of the inverter device is high At the end of the second cycle, when the output power value calculated at the second time is within the output power range determined according to the startup number determined at the first time, the first time is determined. The number of activated units is maintained, and when it is out of the output power range, the number of activated units is determined again based on the second output power value and the high conversion efficiency input power value, and then at the end of the nth cycle , Nth When the output power value is within the output power range determined according to the calculated output power value and the number of startups determined for the (n-1) th time, the (n-1) th startup number is maintained, and when it is outside the output power range, the nth time. A control method for an inverter device, wherein the number of activated devices is determined again based on a first output power value and the high conversion efficiency input power value, and thereafter, the same processing as above is repeated. 前記高変換効率入力電力値は前記インバータ装置の変換効率が高い範囲内でありかつ前記インバータ装置の定格入力電力値の１／２を中心値とする所定範囲で予め定めた値であり、前記出力電力範囲は前記高変換効率入力電力値と前記インバータ装置の起動台数との乗算値を中心値とする所定範囲であることを特徴とする請求項１記載のインバータ装置の制御方法。





























The high conversion efficiency input power value is a value determined in advance within a range in which the conversion efficiency of the inverter device is high and a center value of 1/2 of the rated input power value of the inverter device, and the output 2. The method of controlling an inverter device according to claim 1, wherein the power range is a predetermined range having a center value of a product of the high conversion efficiency input power value and the number of activated inverter devices.





























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Publication number Priority date Publication date Assignee Title
JP2008182836A (en) * 2007-01-25 2008-08-07 Daihen Corp System interconnection inverter system and its power control method
JP2013172567A (en) * 2012-02-21 2013-09-02 Mitsubishi Heavy Ind Ltd Power control device and power control method
CN104393618A (en) * 2014-11-21 2015-03-04 南车株洲电力机车研究所有限公司 Multi-inversion-unit parallel connection based photovoltaic inverter control method
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JP2017011901A (en) * 2015-06-23 2017-01-12 株式会社Ｎｔｔファシリティーズ Control device of photovoltaic power generation system, photovoltaic power generation system, and control program
JP2017189086A (en) * 2016-04-08 2017-10-12 エルエス産電株式会社Lsis Co., Ltd. Method for controlling inverter system

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