WO2021024293A1 - 発電システムおよびプラント制御装置 - Google Patents
発電システムおよびプラント制御装置 Download PDFInfo
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- WO2021024293A1 WO2021024293A1 PCT/JP2019/030441 JP2019030441W WO2021024293A1 WO 2021024293 A1 WO2021024293 A1 WO 2021024293A1 JP 2019030441 W JP2019030441 W JP 2019030441W WO 2021024293 A1 WO2021024293 A1 WO 2021024293A1
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- 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
- 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
- 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
-
- 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
Definitions
- This application relates to a power generation system and a plant control device.
- control for simulating VSG is performed by one power conversion device.
- the present application has been made to solve the above-mentioned problems, and an object of the present application is to provide an improved power generation system and a plant control device so that VSG can be simulated by a plurality of power conversion devices. To do.
- the power generation system for this application is Multiple power converters that convert DC power from DC power sources to AC power, A plant control device that controls the plurality of power conversion devices, and With The plant control device includes a virtual synchronous generator model unit that outputs a power command value based on a current value and a voltage value of a grid interconnection point on the output side of the plurality of power conversion devices.
- the plurality of power conversion devices output the AC power according to the power command value.
- the power generation system and plant control device are A plant control device that controls multiple power converters that convert DC power from a DC power source into AC power.
- the plant control device includes a virtual synchronous generator model unit that outputs a power command value based on a current value and a voltage value of a grid interconnection point on the output side of the plurality of power conversion devices, and the plant control device includes the virtual synchronous generator model unit according to the power command value. It is constructed so that a plurality of power conversion devices output the AC power.
- the plant control device since the plant control device has a virtual synchronous generator model unit, it is not necessary to mount the model on the control circuit of each of the plurality of power conversion devices. Since the plant control device can perform integrated control of a plurality of power converters, it is possible to simulate a VSG (virtual synchronous generator) in the entire system including the plurality of power converters.
- VSG virtual synchronous generator
- FIG. 1 is a diagram showing a configuration of a power generation system 1 and a plant control device 10 according to an embodiment.
- the power generation system 1 operates in grid interconnection with the power grid 100 via the grid interconnection point S.
- the power generation system 1 includes a power plant 2, an interconnection transformer 3, an instrument transformer 5, and a current transformer 4.
- the power plant 2 includes a plurality of power conversion devices 22, a plurality of DC power supplies 23 and 24, a plurality of switches 20, and a plant control device 10.
- an interconnection transformer 3 is interposed between the power plant 2 and the grid interconnection point.
- the signal outputs of the instrument transformer 5 and the current transformer 4 are transmitted to the plant control device 10.
- the plant control device 10 can measure the value of the system current Is and the value of the system voltage Vs at the grid interconnection point.
- a series circuit including a switch 20 and a plurality of transformers 21 is interposed between the interconnection transformer 3 and each of the plurality of power conversion devices 22.
- the plurality of power conversion devices 22 convert DC power from the plurality of DC power supplies 23 and 24 into AC power.
- the power conversion device 22 is a three-phase AC inverter circuit constructed of a plurality of semiconductor switching elements.
- the plurality of power conversion devices 22 include a first power conversion device 22 and a second power conversion device 22.
- the DC power source 23 to which the first power conversion device 22 is connected is a renewable energy power generation device, and an example is a photovoltaic power generation module.
- the DC power supply 24 to which the second power conversion device 22 is connected is a storage battery. Such a system is also called an AC link system.
- the second power conversion device 22 and the DC power supply 24 are provided as an energy storage system (ESS) 25.
- ESS energy storage system
- the power converter is also referred to as a power conditioner system (PCS).
- the plant control device 10 controls a plurality of power conversion devices 22.
- the plant control device 10 is also referred to as a Power Plant Controller (PPC).
- the plant control device 10 includes a virtual synchronous generator model unit 10a.
- the virtual synchronous generator model unit 10a outputs power command values P * and Q * based on the system current value Is and the system voltage value Vs.
- the power command values P * and Q * include the active power command value P * and the reactive power command value Q * .
- the plurality of power converters 22 output AC power according to the power command values P * and Q * .
- a virtual synchronous generator is also referred to as a Virtual Synchronous Generator (VSG).
- the virtual synchronous generator model unit 10a includes a rotor equation of motion model, a governor model, and an AVR control model. As a result, a control model simulating the rotor equation of motion of the synchronous generator and the governor and AVR is incorporated into the plant control device 10.
- the virtual synchronous generator model unit 10a controls so that the tidal current at the grid interconnection point S is virtually the output of the synchronous generator.
- the model configuration of the virtual synchronous generator including the rotor equation of motion model, the governor model, and the AVR control model is already known and new matter, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2014-168351. Absent. Therefore, the description of the specific configuration of the model will be omitted.
- the plant control device 10 Since the plant control device 10 has the virtual synchronous generator model unit 10a, it is not necessary to mount the model on the control circuit of each of the plurality of power conversion devices 22. Since the plant control device 10 can integrally control a plurality of power conversion devices 22, a VSG (virtual synchronous generator) can be simulated in the entire system including the plurality of power conversion devices 22. As a result, economies of scale can be obtained, so that there is an advantage that the system price per unit capacity is reduced.
- VSG virtual synchronous generator
- the plant control device 10 optimally controls a plurality of power conversion devices 22 in the power plant 2, thereby realizing frequency stabilization and voltage stabilization of the power system 100.
- the system frequency and system voltage Vs are maintained, and a system stabilizing effect can be obtained.
- the virtual synchronous generator model unit 10a is mounted on the plant control device 10 instead of each of the plurality of inverter control circuits 22b. Therefore, there is an advantage that it is not necessary to change the hardware and software for the inverter control circuit 22b of each of the large number of power converters 22.
- the virtual synchronous generator can be simulated in the entire system including the plurality of power conversion devices 22 connected by the AC link method.
- the storage batteries can be collectively connected to the second power conversion device 22, so that there is an advantage that it is not necessary to connect the storage batteries to the individual power conversion devices 22 as in the DC link method.
- the storage batteries can be centrally installed in one place without being distributed in the power generation plant 2, so that cost reduction related to the storage battery configuration is also expected.
- FIG. 2 is a diagram showing a configuration of an inverter control circuit included in the power generation system 1 according to the embodiment.
- Each of the plurality of power conversion devices 22 includes a power conversion circuit 22a and an inverter control circuit 22b.
- the inverter control circuit 22b is a power conversion control circuit that controls the power conversion circuit 22a according to the power command values P * and Q * .
- the inverter control circuit 22b preferably includes a PLL circuit 22c.
- the PLL circuit 22c is a phase-locked loop. Since the phase-locked loop can be controlled by the PLL circuit 22c, the control timings of the plurality of power conversion devices 22 can be aligned.
- the technique according to Japanese Patent Application Laid-Open No. 2014-168351 is characterized in that control is realized without using a PLL circuit, and this point is clearly defined as the present embodiment in which the PLL circuit 22c is positively used. Is different.
- the power command values P * and Q * transmitted by the plant control device 10 to the inverter control circuit 22b are preferably analog signals. If it is an analog signal, it is not necessary to perform digital arithmetic processing like a digital signal. By transmitting the power command values P * and Q * with analog signals, the arithmetic processing inside the inverter control circuit 22b can be simplified or omitted. As a result, the feedback control speed can be increased.
- the plant control device 10 directly acquires the system current Is and the system voltage Vs via the current transformer 4 and the instrument transformer 5 without using a measuring instrument called a multimeter. There is. This has the advantage that signal transmission can be performed at a higher speed than via a multimeter, and the control speed can be increased.
- the control cycle of the feedback control performed by the plant control device 10 based on the system voltage Vs and the system current Is is 10 msec or less. If the feedback control cycle is 10 msec or less, the system voltage change or system frequency change on the power system 100 side is reflected in the power command values P * and Q * in the VSG model 10a at a practically sufficient response speed. Such high-speed feedback control can be implemented.
- FIG. 3 is a diagram showing a configuration of a power generation system 1 and a plant control device 10 according to a modified example of the embodiment.
- the plurality of DC power supplies 23 and 24 to which the plurality of power conversion devices 22 are connected are the renewable energy power generation device which is the first DC power supply 23 and the second DC power supply.
- the storage battery of 24 may be connected in parallel.
- a VSG Virtual Synchronous Generator
- the power generation system 1 and the plant control device 10 according to the embodiment may be provided as the power generation method and the plant control method according to the embodiment.
- the power generation method and plant control method according to the embodiment may be implemented by adding the plant control device 10 according to the embodiment after the fact to the existing power generation system and the plant control device.
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Abstract
Description
直流電源からの直流電力を交流電力に変換する複数の電力変換装置と、
前記複数の電力変換装置を制御するプラント制御装置と、
を備え、
前記プラント制御装置は、前記複数の電力変換装置の出力側における系統連系点の電流値および電圧値に基づいて電力指令値を出力する仮想同期発電機モデル部を含み、
前記複数の電力変換装置は前記電力指令値に従って前記交流電力を出力する。
直流電源からの直流電力を交流電力に変換する複数の電力変換装置を制御するプラント制御装置であって、
前記プラント制御装置は、前記複数の電力変換装置の出力側における系統連系点の電流値および電圧値に基づいて電力指令値を出力する仮想同期発電機モデル部を含み、前記電力指令値に従って前記複数の電力変換装置に前記交流電力を出力させるように構築されたものである。
Claims (7)
- 直流電源からの直流電力を交流電力に変換する複数の電力変換装置と、
前記複数の電力変換装置を制御するプラント制御装置と、
を備え、
前記プラント制御装置は、前記複数の電力変換装置の出力側における系統連系点の電流値および電圧値に基づいて電力指令値を出力する仮想同期発電機モデル部を含み、
前記複数の電力変換装置は前記電力指令値に従って前記交流電力を出力する発電システム。 - 前記複数の電力変換装置は、第一電力変換装置と第二電力変換装置とを含み、
前記第一電力変換装置が接続する直流電源は、再生可能エネルギー発電装置であり、
前記第二電力変換装置が接続する直流電源は、蓄電池である請求項1に記載の発電システム。 - 前記複数の電力変換装置それぞれが接続する直流電源の少なくとも一つは、第一直流電源である再生可能エネルギー発電装置と第二直流電源である蓄電池とが並列接続したものである請求項1に記載の発電システム。
- 前記プラント制御装置が前記電力変換装置に伝達する前記電力指令値はアナログ信号である請求項1~3のいずれか1項に記載の発電システム。
- 前記プラント制御装置が前記系統連系点の前記電流値および前記電圧値に基づいて実施するフィードバック制御の制御周期が10msec以下である請求項1~4のいずれか1項に記載の発電システム。
- 前記複数の電力変換装置それぞれが、電力変換回路と、前記電力指令値に従って前記電力変換回路を制御する電力変換制御回路とを含み、
前記電力変換制御回路は、PLL回路を含む請求項1~5のいずれか1項に記載の発電システム。 - 直流電源からの直流電力を交流電力に変換する複数の電力変換装置を制御するプラント制御装置であって、
前記プラント制御装置は、前記複数の電力変換装置の出力側における系統連系点の電流値および電圧値に基づいて電力指令値を出力する仮想同期発電機モデル部を含み、前記電力指令値に従って前記複数の電力変換装置に前記交流電力を出力させるように構築されたプラント制御装置。
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AU2019316537A AU2019316537B2 (en) | 2019-08-02 | 2019-08-02 | Power generation system and plant control device |
PCT/JP2019/030441 WO2021024293A1 (ja) | 2019-08-02 | 2019-08-02 | 発電システムおよびプラント制御装置 |
JP2020504050A JP6981528B2 (ja) | 2019-08-02 | 2019-08-02 | 発電システムおよびプラント制御装置 |
GB2002133.3A GB2596503B (en) | 2019-08-02 | 2019-08-02 | Power generation system and plant control device |
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JP2015100234A (ja) * | 2013-11-20 | 2015-05-28 | 川崎重工業株式会社 | 電力変換装置 |
WO2016185661A1 (ja) * | 2015-05-18 | 2016-11-24 | パナソニックIpマネジメント株式会社 | 分散電源システム、および、分散電源システムの制御方法 |
WO2019116419A1 (ja) * | 2017-12-11 | 2019-06-20 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
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JP5408889B2 (ja) * | 2008-03-18 | 2014-02-05 | 川崎重工業株式会社 | 電力変換装置 |
JP6084863B2 (ja) * | 2013-02-28 | 2017-02-22 | 川崎重工業株式会社 | 系統連系する電力変換装置 |
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JP2015100234A (ja) * | 2013-11-20 | 2015-05-28 | 川崎重工業株式会社 | 電力変換装置 |
WO2016185661A1 (ja) * | 2015-05-18 | 2016-11-24 | パナソニックIpマネジメント株式会社 | 分散電源システム、および、分散電源システムの制御方法 |
WO2019116419A1 (ja) * | 2017-12-11 | 2019-06-20 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
Non-Patent Citations (1)
Title |
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NOGAMI, SHUN ET AL: "System Stabilization Effect of Virtual Synchronization Generator Control in Large-Scale Systems withConsideration for Subordinate Systems", THE 2017 ANNUAL MEETING RECORD I.E.E, 17 March 2017 (2017-03-17), Japan, pages 103 - 104 * |
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JP6981528B2 (ja) | 2021-12-15 |
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GB2596503B (en) | 2023-06-14 |
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