CN103872697A - Variable frequency type three-phase photovoltaic inverter system and control method thereof - Google Patents

Variable frequency type three-phase photovoltaic inverter system and control method thereof Download PDF

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CN103872697A
CN103872697A CN201210551272.1A CN201210551272A CN103872697A CN 103872697 A CN103872697 A CN 103872697A CN 201210551272 A CN201210551272 A CN 201210551272A CN 103872697 A CN103872697 A CN 103872697A
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load
frequency
power
system
inverter
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CN201210551272.1A
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李木
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李木
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/563Power conversion electric or electronic aspects for grid-connected applications
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/566Power conversion electric or electronic aspects concerning power management inside the plant, e.g. battery charging/discharging, economical operation, hybridisation with other energy sources

Abstract

The invention relates to a photovoltaic inverter system and a control method thereof, in particular to a variable frequency type three-phase photovoltaic inverter system and a control method thereof. The variable frequency type three-phase photovoltaic inverter system comprises a master control part, an inverter circuit, a detection circuit, a storage battery charging and discharging circuit, a storage battery interface, a photovoltaic assembly interface, a power frequency load interface, a variable frequency load interface, an electronic control switch, a warning answering device, and an optional isolation transformer. The control method comprises the following steps: when the variable frequency load requests to supply power, on the premise that all power frequency loads are allowed to be powered off, all power frequency loads are disconnected and forbidden to be switched on, and the variable frequency load is powered on in a variable frequency mode; when the frequency is changed into a constant power frequency, a system automatically electrifies the power frequency loads which are allowed to be electrified one by one by referring to the important grade set in advance by a user, wherein the power sum of the power frequency loads is not more than the residual power generation capacity of the system. For the photovoltaic power generation system with the motor type load, the amount of the photovoltaic assembly can be reduced at the beginning of the scheme design by the invention, and the installation cost is lowered.

Description

一种可变频型三相光伏逆变系统及其控制方法 A frequency-phase photovoltaic inverter system and control method

技术领域 FIELD

[0001] 本发明涉及一种光伏逆变系统及其控制方法,尤其涉及一种可变频型三相光伏逆变系统及其控制方法。 [0001] The present invention relates to a photovoltaic inverter system and control method, particularly to a three-phase inverter type photovoltaic inverter system and control method.

背景技术 Background technique

[0002] 随着现代工业的发展,石油、煤、天然气等不可再生能源日渐稀少,以太阳能为代表的新能源符合全球低碳经济的时代潮流,已经得到世界各国政府的认可、重视与扶持。 [0002] With the development of modern industry, petroleum, coal, natural gas and other non-renewable energy sources are becoming scarce, solar energy represented by the new global low carbon economy in line with the trend of the times, it has been recognized by governments around the world, attention and support.

[0003] 光伏发电相关产业在最近几年得到了快速发展,但时至今日,相对于使用如煤炭、石油等不可再生能源的传统发电系统,光伏发电在成本上仍处于劣势地位。 [0003] PV-related industries in recent years has been rapid development, but now, with respect to the use of conventional power generation systems, such as coal, oil and other non-renewable energy, photovoltaic power generation is still at a disadvantage in terms of cost. 这就要求科技工作者不断探索,一方面,尽可能的提高光伏发电系统的转换效率,降低损耗,另一方面,想方设法的降低光伏发电系统的装设成本。 This requires that scientists continue to explore, on the one hand, to improve the conversion efficiency of photovoltaic power generation system as much as possible, reduce losses, on the other hand, find ways to reduce the installation cost of photovoltaic power generation system.

[0004] 当今,电力负载中有为数不少的电机类负载,这类负载在启动的短时间内,需要较大的电源功率,光伏发电系统不仅仅提供有功功率,还必须同时提供一定量的无功功率,功率消耗较之稳定运行时大幅增加,因而,光伏发电系统在设计之初,设计人员通常会把光伏组件的容量设计成比负载的额定功率多出一半至几倍的瓦特数,无疑,这大幅提高了以光伏组件为主的光伏发电系统的装设成本。 [0004] Today, there are electrical loads in motor load a large number of classes, such a load in a short time to start, requires a large supply of power, photovoltaic power generation system not only provides active power, it must also provide a certain amount of reactive power, power consumption compared to a substantial increase in stable operation, and thus, photovoltaic power generation system early in the design, designers often put capacity of PV modules are designed to load than the rated power of more than half the wattage to several times, undoubtedly, this greatly increases the installed cost of PV modules to PV-based system.

发明内容 SUMMARY

[0005] 本发明的可变频型三相光伏逆变系统,是光伏发电系统的核心组成部分,成本与传统逆变装置差别不大,功能上可克服上述缺点,对于电机类负载,从变频的角度解决问题,通过减少光伏组件的容量,使光伏发电系统的装设成本大幅降低。 Variable frequency three-phase PV inverter system [0005] of the present invention, the core part of the photovoltaic power generation system, the cost of the conventional inverter apparatus is not very different, the function may overcome the above disadvantages, the motor for the type of load, from the converted angle to solve the problem by reducing the capacity of PV modules, the installation cost of photovoltaic power generation system is greatly reduced. 除此之外,本发明的科学的电源管理与控制方法也对能源的节省与高效利用具有重要意义。 In addition, scientific and power management control method according to the invention is also important for the efficient use of energy saving.

[0006] 本发明所有相关描述中的“工频”含义为一个国家或地区市电、工业用电的频率,包括但不限于50赫兹、60赫兹。 [0006] All relevant description of the present invention, "frequency" meaning mains a country or region, the frequency of the electricity industry, including but not limited to 50 Hz, 60 Hz.

[0007] 本发明的可变频型三相光伏逆变系统包括主控部分、逆变电路、检测电路、蓄电池充放电电路、蓄电池接口、光伏组件接口、工频负载接口、变频负载接口、电控开关、警示应答装置,变压器可选,其中主控部分与逆变电路、检测电路、蓄电池充放电电路、光伏组件接口、工频负载接口、变频负载接口、电控开关、警示应答装置分别电气连接;光伏组件接口、蓄电池充放电电路以及逆变电路的直流侧三者彼此电气连接;蓄电池充放电电路与蓄电池接口电气连接;检测电路与蓄电池充放电电路、电控开关、逆变电路的交直流两侧分别电气连接;工频负载接口、变频负载接口分别与逆变电路交流侧直接电气连接或经变压器间接电气连接。 [0007] The present invention may be a three-phase inverter type photovoltaic inverter system includes a main control section, an inverter circuit, a detection circuit, battery charge and discharge circuit, a battery interface, a photovoltaic module interfaces, interfaces load frequency, frequency load interface, electrically controlled switch, warning transponder, transformer Alternatively, wherein the main control section and the inverter circuit, a detection circuit, battery charge and discharge circuit, a photovoltaic module interfaces, interfaces load frequency, frequency load interface, an electronically controlled switch, the warning means are electrically connected to the response ; PV module interfaces, the DC side of the three battery charge and discharge circuit, an inverter circuit electrically connected to each; battery charge and discharge an interface circuit electrically connected to the battery; detecting circuit and battery charge and discharge circuit, AC and DC electronically controlled switch, the inverter circuit both are electrically connected; frequency load interface, the interface inverter are respectively connected to the AC load side of the inverter circuit via a direct electrical connection or an indirect electrical transformer. 工频负载接口的数量为一个或相互并联的多个,变频负载接口的数量为一个或相互并联的多个。 The number of frequency or load interface for a plurality of mutually parallel, the number of frequency or load interface for a plurality of mutually parallel. 以上各组成部分在功能或结构上可以合并或拆分。 The above components may be combined or split in function or structure.

[0008] 主控部分与电控开关、警示应答装置分别通过有线或无线的方式进行通信:有线通信方式包括但不限于串行总线、并行总线、一根或多根信号线;无线通信方式包括但不限于射频、红外、蓝牙、磁场。 [0008] The main control section and the electronically controlled switch, warning response means, respectively, communicate through a wired or wireless manner: wired communication including but not limited to a serial bus, parallel bus, one or more signal lines; a wireless communication system comprising but are not limited to, radio frequency, infrared, Bluetooth, magnetic field. 此外,电控开关的状态信息也可以选择经检测电路发送至主控部分。 In addition, status information may be electronically controlled switch is transmitted to the main control section via the selected detecting circuit.

[0009] 本发明的主控部分包含微处理器、微控制器中的一种或多种,负责整个系统的信息采集、分析处理、决策输出等核心任务,是整个光伏逆变系统的控制核心。 [0009] The main control section according to the present invention comprises a microprocessor, one or more microcontrollers in charge of the whole system information collection, analysis, decision outputs the core task is to control the core of the PV inverter system . 其中微控制器的类型包括但不限于单片机、DSP、CPLD, FPGA, PLC0 Wherein the microcontroller of the type including but not limited to the microcontroller, DSP, CPLD, FPGA, PLC0

[0010] 本发明的逆变电路可以选择的构成方式包括但不限于:包含若干个变流桥臂或集成功率模块,对于包含变流桥臂的情况,每个桥臂由多个全控开关器件串联构成,每个全控开关器件都反并联一个续流二极管,本发明描述中的“全控开关器件”指既能控制开通又能控制关断的电力电子开关器件,类型包括但不限于晶体管、IGBT, MOSFET, IGCT, IEGT、GT0、SET ;对于包含集成功率模块的情况,集成功率模块的类型包括但不限于IPM功率模块。 [0010] The inverter circuit constituting the embodiment of the present invention may be selected include, but are not limited to: the converter comprises a plurality of integrated power module or the arm, in the case of the converter comprises a bridge arm, each arm by a plurality of full-controlled switches devices in series, each of the full-controlled switching devices are in anti-parallel freewheeling diode, the present invention is described in the "full-controlled switching device" can refer both to control the opening of the control power electronic switching devices turned off, including but not limited to the type of transistor, IGBT, MOSFET, IGCT, IEGT, GT0, SET; in the case of integrated power module comprising, integrated power module types include, but are not limited to for IPM.

[0011] 本发明的逆变电路的拓扑结构的电平数为2或大于2的奇数,其中大于2的奇数个电平的拓扑结构的类型包括但不限于二极管嵌位型、飞跨电容型、单元级联型。 Type of topology [0011] The number of levels of the inverter circuit topology of the present invention is an odd number greater than 2 or 2, wherein the odd number is greater than level 2 include but are not limited diode clamp type, flying capacitor , cascaded unit.

[0012] 本发明中的电控开关指可以通过有线或无线方式控制其开通、关断的开关器件,类型上包含但不限于断路器、接触器、继电器,位于逆变器交流侧与负载之间,可对一路或多路负载的上电、停电进行远程操控。 [0012] The electronically controlled switch means in the present invention which can be controlled open by wire or wireless means, switching off the device, including but not limited to circuit breakers, contactors, relays, located on the AC side of the inverter and the load on the type of between, on one or more channels can be loaded on power-up, power remote control.

[0013] 本发明的检测电路包括但不限于:逆变电路交流侧的电压传感器与电流传感器、逆变电路直流侧的电压传感器与电流传感器、蓄电池充放电电路的电压传感器。 [0013] The detection circuit according to the present invention include, but are not limited to: a voltage sensor and a current sensor, the DC side of the inverter circuit of the voltage sensor and the current sensor AC side of the inverter circuit, the charging and discharging a battery voltage sensor circuit.

[0014] 本发明包含辅助控制的警示应答装置,该警示应答装置位于各个负载附近,包含声音报警装置、光报警装置、指示灯、数码管、显示屏、显示器中的一种或多种,还包含警示应答按钮,并具有通信接口,主控部分对一路或多路负载进行通、断电远程操作前的一段时间内,操控对象附近的警示应答装置会选择发声、发光以及信息显示三种形式中的一种或多种进行报警,提示操作人员判断此时是否允许远程操作并通过警示应答按钮予以回复,主控部分根据一段时间内是否得到回复以及回复内容的不同,按照用户预先设定的程序分别进行后续操控。 [0014] The present invention comprises a warning device for assisting control of the response, the alarm transponder is located in the respective load, comprising a sound alarm, alarm light, lamp, LED, display, in the display of one or more further comprising warning answer button, and has a communication interface, the main control section of the one or more channels within a period of time before the load is turned on, the remote operation off, manipulate objects near the selected sound will alert response means, and light emitting displays three forms of information one or more alarm to inform the operator determines whether to permit remote operation at this time and reply by warning answer button, the main control section according to whether the reply over time and respond to different content, in accordance with the user preset follow-up procedures were manipulated.

[0015] 本发明针对可变频型三相光伏逆变系统的具体控制方法如下。 [0015] DETAILED control method for a variable frequency three-phase PV inverter system according to the invention is as follows.

[0016] 1.针对所有负载。 [0016] 1. For all loads.

[0017] 当系统运行在非工频状态时,系统断开并禁止接通所有其它负载接口。 [0017] When the system is running in the non-frequency state, the system is turned OFF and disables all other load interface.

[0018] 系统供电运行时,如系统供电能力下降,经问询后,断开现场应答允许断电且用户预先设定的重要等级相对较低的负载,如供电能力仍然不足,则强制断开用户预先设定的重要等级相对较低的负载,直至系统供电能力可以满足处于运行状态的全部负载。 [0018] power system operation, system power supply capacity decline, after inquiry, off-site response allows the power failure and the user pre-set important relatively low level loads, such as power supply capacity is still insufficient, then forcibly disconnected important relatively low load level preset by the user, until the system capacity to meet the power supply in the full load operating state.

[0019] 系统供电运行时,如系统供电能力提高或有负载停止工作,系统通过对比系统可提供剩余容量与所有请求供电的工频负载的功率需求,经问询后,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一接通。 [0019] The power supply system is running, the ability to increase or the power supply system of a load is stopped, the system may provide a system by comparing the remaining capacity of the power supply requirements of all requests frequency and load, after the inquiry, the response allows on-site power several frequency load in accordance with a predetermined level of importance of the user turns one by one.

[0020] 2.针对变频负载。 [0020] 2. For inverter load.

[0021] 当变频负载请求供电时,视不同情形选择不同的控制对策: [0021] When the variable load is requesting power, depending on the case to select a different control strategies:

第一种情形,系统中没有其它负载处于运行状态,则关闭并禁止接通所有工频负载接口,接通请求供电的变频负载接口,按照用户预先设定的变频方式供电; The first case, there is no other load system is running, it shuts down and turn on all the banned frequency load interface, power supply ON request frequency load interface, power conversion system according to a user set in advance;

第二种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果应答信号中有禁止断电请求,则等待,直至该禁止断电信号消失为止; 第三种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果所有正运行的负载现场无禁止断电信号发出,但存在正在运行的负载未回复应答信号,即回复信号不全,则依据用户设定的逻辑进行后续操作; The second case, the system is in the other frequency load operating state, a warning is issued at the load site, suggesting load frequency electricity application, if there is a power down request response signal is prohibited, it waits until the off prohibiting disappeared electrical signal; a third scenario, the system has another operating frequency is in the load state, a warning is issued at the load site, suggesting load frequency electricity application, if all the load site without running off prohibiting signal issued, but the presence of a load running not reply the response signal, i.e. incomplete reply signal, the subsequent operations according to the logic set by the user;

第四种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果所有正运行的负载现场无禁止断电信号发出,且所有正在运行的负载都回复了应答信号,即回复信号完全,则按照用户预先设定的变频方式供电。 The fourth case, the system has another operating frequency is in the load state, a warning is issued at the load site, suggesting load frequency electricity application, if all the load site without running off prohibiting signal is issued, and all are running load is responded response signal, i.e. full reply signal, the conversion system in accordance with a predetermined power user.

[0022] 针对变频负载,无论何种情况,当变频负载可以上电时,首先断开所有负载接口,之后接通请求供电的变频负载接口,并禁止其它负载接口上电,再后按照用户预先设定的变频方式启动、运行,当频率变为工频时,系统通过对可提供功率与所有此前断开的工频负载容量需求进行对比,经问询后,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一接通。 [0022] For load inverter, in either case, when the variable frequency power load may be, is disconnected from all load interface, after turning on the power supply of the inverter load connection request, and prohibits the other electrical loads on the interface, then the user in advance in accordance with frequency setting mode starting, running, when the frequency becomes frequency, the power system by providing all the previous work on disconnected frequency may compare the load capacity requirements, after inquiry, the response of the field to allow the plurality of power frequency load according to the importance level preset by the user turned on one by one.

[0023] 针对变频负载,无论何种情况,当变频负载工作完毕且断电后,首先问询各个负荷的运行现场,之后系统对比实时可提供功率与先前断开的所有工频负载容量,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一恢复供电。 [0023] For load inverter, in either case, when the frequency and the off-load operation is completed, the first inquiry of the operating site of each load, after the system may provide real-time comparison of all operating power and frequency previously disconnected loading capacity, for response field allowing the power load in accordance with the number of frequency preset by the user one by one to restore power level of importance.

[0024] 3.针对工频负载。 [0024] 3. For frequency load.

[0025] 工频负载请求供电时,视不同情形选择不同的控制对策: When [0025] the load request power frequency, depending on the case to select a different control strategies:

第一种情形,没有其它负载运行,则直接为该工频负载通电。 The first scenario, there is no other load operation, the frequency for energizing the load directly.

[0026] 第二种情形,有其它负载运行在工频状态,且系统可提供剩余容量能够满足其功率要求时,直接接通供电。 [0026] The second case, in the other frequency load operation state, and the remaining capacity of the system can be provided to meet its power requirements, the power supply is turned on directly.

[0027] 第三种情形,有其它负载运行在工频状态,且系统可提供剩余容量不能满足其功率要求时,经问询后,现场应答允许断电的重要等级比其低的负载功率与系统剩余容量总和可以满足请求供电的工频负载,则系统断开允许断电的重要等级比其低的负载,并对该工频负载通电。 [0027] The third case, in other frequency load operation state, and the system may provide the remaining capacity can not meet the power requirements, after inquiry, allowing off-site response level of importance lower than the load power and the sum of the remaining capacity of the power supply system can meet the request frequency load, the system allows disconnection of power failure the importance level which is lower than the load, and the load power frequency.

[0028] 上述三种情形之外的境况,请求供电的工频负载必须等待。 [0028] other than the above three cases the situation, requesting power load must wait for the frequency.

[0029] 相对于传统光伏逆变系统,本发明的优势包括但不限于如下方面: [0029] with respect to the conventional photovoltaic inverter system, the advantages of the present invention include, but are not limited to, the following:

首先,一个明显的优势在于:针对电机类负载,本发明的光伏逆变系统使光伏组件的设计容量降至接近于极限值,只需略大于负荷的额定功率即可。 First, a distinct advantage in that: the motor for the class load, photovoltaic inverter system of the present invention enables the design capacity down to its limit value of the photovoltaic module, just slightly larger than the rated power to the load. 对于同样的电机类负载,当今广泛应用的传统设计方案中,光伏组件的设计容量一般为本设计方案的1.5倍至3倍,个别无功功率需求较高的应用场合甚至达到3倍以上,这大幅提高了当今以光伏组件为主的光伏发电系统的装设成本。 For the same class of motor load, the traditional design today widely used in the design capacity of the photovoltaic module is generally 1.5 to 3 times the present design, the higher the reactive power requirements of individual applications or even more than 3 times, this a substantial increase in the cost of today's installed PV modules to PV-based system.

[0030] 其次,在长期运行过程中,对于电力负载中大量存在的电机,工频启动一般伴随着大电流、高功率以及诸多谐波,使电机的使用寿命大幅降低,而且,过大的电流、过高的视在功率、过多的谐波含量也容易使逆变装置发生故障或损坏,并且带来额外的损耗。 [0030] Second, in the long run, for the motor load there are a lot of power, frequency start generally accompanied by high current, high power and many harmonics, significantly reduce the life of the motor, but also, excessive current , high apparent power, harmonic content is too easy to damage or malfunction of the inverter device, and the extra losses.

附图说明 BRIEF DESCRIPTION

[0031] 图1为本发明实施例的一次侧电气结构示意图。 [0031] FIG. 1 primary side schematic electrical configuration of an embodiment of the present invention.

[0032] 图2为本发明实施例的控制与检测电路示意图。 [0032] FIG 2 a schematic diagram of a control circuit of the detection of the embodiment of the present invention.

[0033] 图3为本发明实施例的主控部分电路原理图。 [0033] FIG main control section 3 a schematic circuit diagram according to an embodiment of the present invention.

[0034] 图4为本发明实施例的逆变电路原理图。 [0034] FIG. 4 schematic circuit diagram of an inverter according to an embodiment of the present invention. 具体实施方式 Detailed ways

[0035] 以下实施例属于本发明具体形式中的一种,给出的目的是更详细的描述本发明,而不是限制本发明的范围,也不是限定本发明的应用形式。 [0035] The following examples belonging to a particular form of the invention, given for the purpose of the present invention is described in more detail, and not to limit the scope of the present invention, not limiting the application of the present invention.

[0036] 本实施例如图1〜图4所示。 [0036] The present embodiment 4 as shown in FIG. 1 ~ FIG.

[0037] 本实施例包括主控部分、逆变电路、蓄电池充放电电路、蓄电池接口、检测电路、光伏组件接口、工频负载接口、变频负载接口、电控开关、警示应答装置,本实施例的一次侧电气结构示意图如图1所示。 [0037] Examples of the present embodiment includes a main control section, an inverter circuit, a battery charging and discharging circuit, a battery interface, a detection circuit, a photovoltaic module interfaces, interfaces load frequency, frequency load interface, an electronically controlled switch, alarm transponder, the present embodiment the electrical configuration of the primary side is shown in Fig.1.

[0038] 本实施例的检测电路包括但不限于: [0038] The detection circuit of this embodiment include, but are not limited to:

1.逆变电路交流侧的电压传感器; 1. AC side of the inverter voltage sensor circuit;

2.逆变电路交流侧的电流传感器; 2. The inverter circuit the AC side current sensor;

3.逆变电路直流侧的电压传感器; 3. The voltage sensor circuit current side of the inverter;

4.逆变电路直流侧的电流传感器; 4. The current sensor of the DC side of the inverter circuit;

5.蓄电池充放电电路的电压传感器; The battery voltage sensor circuit charging and discharging;

6.电控开关状态感知电路。 6. The electronically controlled switch state sensing circuit.

[0039] 本实施例的控制与检测电路示意图如图2所示。 [0039] This control and detection circuit schematic of an embodiment shown in FIG.

[0040] 本实施例的主控部分电路原理图如图3所示,Ul是微控制器,对系统的运行进行精确控制,并对传感器数据进行实时分析并决策;U17是为微控制器提供精准时钟的晶体振荡器;U11是用于存储数据的存储器;主控部分通过Jll、J12、J13、J15、J20、J21、J31、J32等接口分别与外部功能模块进行信息交换,其中Jll为开关量输入接口,包含但不限于系统发出的过压保护、欠压保护、过流保护、过温保护、超载等开关量信息;J12为开关量输出接口,主控部分的开关量控制信息经此接口发出;J13为串行通信接口;J15是微控制器编程接口;J21是用于并行通信的数据/地址总线接口;J31是SPI通信接口;J32是SCI通信接口;微控制器精确计算出实时脉宽信息,并经J20接口输出PWM脉冲。 [0040] The main control section according to the present embodiment of the circuit diagram shown in Figure 3, microcontroller Ul for precise control operation of the system, the sensor data and real-time analysis and decision making; U17 is to provide a microcontroller accurate crystal oscillator clock; U11 is a memory for storing data; exchange information by the main control portion Jll, J12, J13, J15, J20, J21, J31, J32 and other interfaces with external functional modules respectively, wherein the switching Jll input interfaces, including, but not sent to the overvoltage protection system, undervoltage protection, overcurrent protection, over-temperature protection, overload switch information; J12 switching output interface, switch control information to the main control section of this Interface issued; serial communication interface J13; J15 micro controller programming interface; the J21 data / address bus interface for parallel communication; J31 SPI is a communication interface; J32 is a communication interface SCI; microcontroller accurately calculated in real time pulse width information, and outputs the PWM pulse J20 via the interface.

[0041] 本实施例中电控开关的类型选择接触器,位于逆变器交流侧与负载之间,可以并只能对其中一路负载的上电、关断进行远程操控。 [0041] In the present embodiment the type of electronically controlled switch selection contactor embodiment, located between the AC side of the inverter and a load, and may be only for the way in which an electrical load, remotely controlled shut-off.

[0042] 本实施例中的主控部分与警示应答装置通过多根信号线的方式进行信息的传递;主控部分的控制命令经信号线传至电控开关;电控开关的状态信息经检测电路中的电控开关状态感知电路发送至主控部分。 [0042] The main control section of the present embodiment and the alert response means performs transmission of information by way of plurality of signal lines of the embodiment; control command of the main control section through a signal line transmitted electronically controlled switch; electronically controlled switch state information detected electronically controlled switch state sensing circuit circuit transmits to the main control section.

[0043] 本实施例中的警示应答装置位于各个负载附近,功能结构上包括声光报警装置以及警示应答按钮,并具有通信接口,主控部分在对一路或多路负载进行通、断电远程操作前的一段时间内,在主控部分的控制下,操控对象附近的警示应答装置会声光报警,提醒操作人员判断此时是否允许远程操作并通过警示应答按钮予以回复,主控部分根据一段时间内是否得到回复以及回复内容的不同,按照用户预先设定的程序分别进行后续操控。 [0043] In this embodiment of the warning device is located in each of the load response, the functional structure comprises a warning sound and light alarm device and answer button, and has a communication interface, the main control section to the load through one or more channels, the remote off period of time prior to operation, under the control of the control section, the response control means will alert nearby target sound alarm to alert the operator determines whether to permit remote operation at this time and reply by warning answer button, the main control section according to the period whether the reply and the contents of the different time responses, according to a program preset by the user for subsequent manipulation, respectively.

[0044] 本实施例的逆变电路原理图如图4所不,该逆变电路米用二相两电平的拓扑结构,含有三个结构完全相同的变流桥臂,每个变流桥臂由两组并联有续流二极管的IGBT串联而成,逆变电路直流侧并联有支撑电容Cdl。 The inverter circuit schematics [0044] Example of the present embodiment is not shown in Figure 4, the inverter circuit topology meters with a two-phase two-level, structure containing identical three converter bridge arms each converter bridge two arm IGBT in series with a freewheeling diode connected in parallel from the inverter circuit in parallel to the DC side of a support capacitor Cdl.

[0045] 本实施例针对不同类型负载,采用的具体控制方法如下: [0045] The embodiment of the present embodiment for different types of loads, using a specific control method is as follows:

1.针对所有负载:当系统运行在非工频状态时,系统断开并禁止接通所有其它负载接口。 1. For all load: When the system is operating in a non-frequency state, the system is turned OFF and disables all other load interface. 系统供电运行时,如系统供电能力下降,经问询后,断开现场应答允许断电且用户预先设定的重要等级相对较低的负载,如供电能力仍然不足,则强制断开用户预先设定的重要等级相对较低的负载,直至系统供电能力可以满足处于运行状态的全部负载。 Power system operation, system power supply capacity decline, after inquiries by, and off-site response allows the user to pre-set off a relatively low level of important loads such as power supply capacity is still insufficient, then forced to disconnect a user preset important given the relatively low level of the load until the system power supply capacity to meet the load in all operating conditions. 系统供电运行时,如系统供电能力提高或有负载停止工作,系统通过对比系统可提供剩余容量与所有请求供电的工频负载的功率需求,经问询后,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一接通。 Runtime system power supply, such as the ability to improve the system power supply or a load is stopped, the system may provide a system by comparing the remaining capacity of the power demand and supply all the frequency requests load, after the inquiry, the response of a plurality of work site to allow the power in accordance with an important frequency load level preset by the user turned on one by one.

[0046] 2.针对变频负载。 [0046] 2. For inverter load. 当变频负载请求供电时,视不同情形选择不同的控制对策: 第一种情形,系统中没有其它负载处于运行状态,则关闭并禁止接通所有工频负载接 When the variable load is requesting power, depending on the case to select a different control strategies: the first case, there is no other load system is running, it shuts down and turn on all the banned frequency load connected

口,接通请求供电的变频负载接口,按照用户预先设定的变频方式供电;第二种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果应答信号中有禁止断电请求,则等待,直至该禁止断电信号消失为止;第三种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果所有正运行的负载现场无禁止断电信号发出,但回复信号有缺失,依据用户设定的逻辑进行后续操作;第四种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果所有正运行的负载现场无禁止断电信号发出,回复信号没有缺失,即所有正在运行的负载都回复了应答信号,则按照用户预先设定的变频方式供电。 Port, turning on the load interface requesting power inverter, power conversion system according to a user set in advance; the second case, the system is in the other frequency load operating state, a warning is issued at the load site, suggesting frequency load electricity application, if the response signal prohibited power down request, wait until the power-off prohibiting signal disappeared; the third case, the system has another operating frequency is in the load state, a warning is issued at the load site , suggesting load frequency electricity application, if all the load site without running off prohibiting signal is issued, but missing reply signal, subsequent operations according to the logic set by the user; the fourth scenario, the system loads in other when the frequency operation state, issued a warning in these loads scene, suggesting the frequency of electricity load application, if all of the running load off the scene without prohibiting signal is issued, the reply signal is not missing, that all loads are running replied response signal, the power conversion system according to a user set in advance.

[0047] 针对变频负载,无论何种情况,当变频负载可以上电时,首先断开所有负载接口,之后接通请求供电的变频负载接口,并禁止其它负载接口上电,再后按照用户预先设定的变频方式启动、运行,当频率变为工频时,系统通过对可提供功率与所有此前断开的工频负载容量需求进行对比,经问询后,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一接通。 [0047] For load inverter, in either case, when the variable frequency power load may be, is disconnected from all load interface, after turning on the power supply of the inverter load connection request, and prohibits the other electrical loads on the interface, then the user in advance in accordance with frequency setting mode starting, running, when the frequency becomes frequency, the power system by providing all the previous work on disconnected frequency may compare the load capacity requirements, after inquiry, the response of the field to allow the plurality of power frequency load according to the importance level preset by the user turned on one by one.

[0048] 针对变频负载,无论何种情况,当变频负载工作完毕且断电后,首先问询各个负荷的运行现场,之后系统对比实时可提供功率与先前断开的所有工频负载容量,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一恢复供电。 [0048] For load inverter, in either case, when the frequency and the off-load operation is completed, the first inquiry of the operating site of each load, after the system may provide real-time comparison of all operating power and frequency previously disconnected loading capacity, for response field allowing the power load in accordance with the number of frequency preset by the user one by one to restore power level of importance.

[0049] 3.针对工频负载。 [0049] 3. For frequency load. 工频负载请求供电时。 Load request power frequency. 视不同情形选择不同的控制对策: 第一种情形,没有其它负载运行,则直接为该工频负载通电;第二种情形,有其它负载 Depending on the case to select a different control strategies: the first case, there is no other load operation, load power frequency directly for work; the second case, there are other loads

运行在工频状态,且系统可提供剩余容量能够满足其功率要求时,直接接通供电;第三种情形,有其它负载运行在工频状态,且系统可提供剩余容量不能满足其功率要求时,经问询后,现场应答允许断电的重要等级比其低的负载功率与系统剩余容量总和可以满足请求供电的工频负载,则系统断开允许断电的重要等级比其低的负载,并对该工频负载通电;上述三种情形之外的境况,请求供电的工频负载必须等待。 When the third case, in other frequency load operation state, and the system may provide the remaining capacity can not meet the power requirements; running frequency state, and the remaining capacity of the system can be provided to meet its power requirements, directly connected to the power supply , after inquiry, allowing off-site response level of importance lower than the sum of the remaining load capacity of the power supply system can meet the request frequency load, the system allows disconnection of power-off duty ratio of the lower level of importance thereof, and the load power frequency; situation other than the above three cases, the power supply frequency request must wait for the load.

[0050] 相对于传统光伏逆变系统,本发明的优势在于:首先,可变频型光伏逆变系统使光伏组件的设计容量降至接近于极限值,只需略大于负荷的额定功率即可,较之传统设计方案,本发明使光伏发电系统的装设成本得以大幅降低。 [0050] with respect to the conventional photovoltaic inverter system, the advantages of the present invention is that: firstly, the PV inverter system allows conversion type photovoltaic module design capacity down to its limit value, just slightly larger than the rated power to the load, compared with traditional designs, the present invention is that the cost of installation of photovoltaic power generation system can be greatly reduced. 其次,电力负载中存在大量的电机,变频启动使得电机的使用寿命大幅增加,而且,尽量减少谐波电流以及视在功率也使逆变装置的故障几率大大降低,并且减少损耗。 Secondly, there are a lot of power load motor, so that frequency conversion of a substantial increase in the service life of the motor, and to minimize the harmonic current, and also the apparent power of the inverter device failure probability is greatly reduced, and reduced losses.

[0051] 除上述以外,本发明的科学的电源管理与控制方法也对能源的高效利用与节省具 [0051] In addition to the above, the scientific power management and control method of the present invention is also efficient use of energy saving and having

有重要意义。 There's important meaning. [0052] 本发明在新能源以及节能减排领域具有较高的推广价值。 [0052] The present invention has the promotion of high value in the new field of energy and energy saving.

Claims (10)

1.一种可变频型三相光伏逆变系统,其特征在于包括主控部分、逆变电路、检测电路、光伏组件接口、一个或相互并联的多个工频负载接口、一个或相互并联的多个变频负载接口,变压器可选,其中主控部分与逆变电路、检测电路、光伏组件接口、工频负载接口、变频负载接口分别电气连接;光伏组件接口与逆变电路的直流侧电气连接;工频负载接口、变频负载接口分别与逆变电路交流侧直接电气连接或经变压器间接电气连接,以上各组成部分在功能或结构上可以合并或拆分。 1. A three-phase inverter type photovoltaic inverter system, comprising main section, an inverter circuit, a detection circuit, a photovoltaic module interfaces, parallel to each other or a plurality of frequency load interface, or parallel with each other in a a plurality of frequency load interface, an optional transformer, wherein the main control section and the inverter circuit, a detection circuit, a photovoltaic module interfaces, frequency load interface, the interface inverter are electrically connected to a load; PV module DC side electric interface circuit is connected to the inverter ; frequency load interface, the interface inverter are respectively connected to the AC load side of the inverter circuit through a direct electrical connection or through an indirect electrical transformer, the above components may be combined or split in function or structure.
2.根据权利要求1所述的可变频型三相光伏逆变系统,其特征在于逆变电路可以选择的构成方式包括但不限于:包含若干个变流桥臂或集成功率模块,对于包含变流桥臂的情况,每个桥臂由多个全控开关器件串联构成,每个全控开关器件都反并联一个续流二极管,本发明描述中的“全控开关器件”指既能控制开通又能控制关断的电力电子开关器件,类型包括但不限于晶体管、IGBT, MOSFET, IGCT, IEGT、GT0、SET ;对于包含集成功率模块的情况,集成功率模块的类型包括但不限于IPM功率模块。 The variable frequency three-phase PV inverter system according to claim 1, characterized in that the inverter circuit constituting the embodiment may be selected include, but are not limited to: the converter comprises a plurality of integrated power module or the arm, for the variant comprising where the bridge arm, each arm is constituted by a plurality of full-controlled switching device connected in series, each of the full-controlled switching devices are in anti-parallel freewheeling diode, the present invention is described in the "full-controlled switching device" refers both to control the opening but off control power electronic switching devices, including but not limited to the type of transistor, IGBT, MOSFET, IGCT, IEGT, GT0, SET; in the case of integrated power module comprising, integrated power module types include, but are not limited to for IPM .
3.根据权利要求2所述的可变频型三相光伏逆变系统,其特征在于包括蓄电池充放电电路、蓄电池接口,蓄电池充放电电路与蓄电池接口、逆变电路直流侧、主控部分分别电气连接。 The variable frequency three-phase PV inverter system according to claim 2, characterized in that the charge and discharge circuit includes a battery, a battery interface, a battery charge and discharge the battery and the interface circuit, the DC side of the inverter circuit, the main control section are electrically connection.
4.根据权利要求3所述的可变频型三相光伏逆变系统,其特征在于检测电路包括但不限于:逆变电路交流侧的电压传感器与电流传感器、逆变电路直流侧的电压传感器与电流传感器、蓄电池充放电电路电压传感器。 The variable frequency three-phase PV inverter system according to claim 3, characterized in that the detection circuit include, but are not limited to: a voltage sensor voltage sensor and the current sensor AC side of the inverter circuit, the DC side of the inverter circuit a current sensor, a voltage sensor circuit battery charge and discharge.
5.根据权利要求4所述的可变频型三相光伏逆变系统,其特征在于主控部分包含微处理器、微控制器中的一种或多种,其中微控制器的类型包括但不限于单片机、DSP、CPLD、FPGA、PLC,主控部分实时控制的逆变电路采用的拓扑结构的电平数为2或大于2的奇数,其中大于2的奇数个电平的拓扑结构的`类型包括但不限于二极管嵌位型、飞跨电容型、单元级联型。 The variable frequency three-phase PV inverter system according to claim 4, characterized in that the main control section includes one microprocessor, microcontroller or more, wherein the type of microcontroller include, but are not `microcontroller type topology is limited, the number of levels topology DSP, CPLD, FPGA, PLC, real-time control of the main control section used in the inverter circuit 2 is an odd number greater than or 2, wherein the odd number is greater than level 2 including but not limited to a diode clamp type, flying capacitor, cascaded units.
6.根据权利要求1至权利要求5所述的可变频型三相光伏逆变系统,其特征在于包括电控开关,该电控开关位于逆变器交流侧与负载之间,可对一路或多路负载进行远程电动操控,类型上包含但不限于断路器、接触器、继电器,主控部分与电控开关通过有线或无线的方式进行信号传递:有线通信方式包括但不限于串行总线、并行总线、一根或多根信号线;无线通信方式包括但不限于射频、红外、蓝牙、磁场,除此之外,电控开关的状态信息也可以选择经检测电路发送至主控部分。 6. The variable frequency three-phase PV inverter system according to claim claim 1, characterized by comprising electronically controlled switch, the electronically controlled switch is located between the AC side of the inverter and the load, or may be on the way multiple load electric remote control, comprising but not limited to the type of circuit breakers, contactors, relays, and the main control section electronically controlled switch signal transmitted through a wired or wireless manner: wired communication including but not limited to a serial bus, a parallel bus, one or more signal lines; wireless communications including but not limited to, radio frequency, infrared status information, a Bluetooth, a magnetic field, in addition, electronically controlled switch may also be transmitted to the detection circuit via the selected main control section.
7.根据权利要求1至权利要求5所述的可变频型三相光伏逆变系统,其特征在于包括警示应答装置,该警示应答装置位于各个负载附近,包含声音报警装置、光报警装置、指示灯、数码管、显示屏、显示器中的一种或多种以及警示应答按钮,并具有通信接口,主控部分对一路或多路负载进行通、断电远程操作前的一段时间内,操控对象附近的警示应答装置会以声、光或信息显示的方式报警,提醒操作人员判断此时是否允许远程操作并通过警示应答按钮予以回复,主控部分根据一段时间内是否得到回复以及回复内容的不同,按照用户预先设定的程序分别进行后续操控,主控部分与警示应答装置之间通过有线或无线的方式进行通信:有线方式采用的通信媒介包括但不限于串行总线、并行总线、一根或多根信号线;无线方式采用的通信媒介包括但不限于射频 7. The variable frequency three-phase PV inverter system according to claim claim 1, wherein the response means comprises a warning, the alarm transponder is located in the respective load, comprising an audible alarm device, an optical warning device, indicating lamp, LED, display, displays one or more alert and answer button, and has a communication interface, the main control section of the one or more channels within a period of time before the load is turned on, the remote operation off, manipulate objects alert response means so as to be close to sound, light, or alarm information is displayed to alert the operator determines whether to permit remote operation at this time and reply by warning answer button, the main control section according to whether the reply period of time and respond to different content according to the program preset by the user for subsequent manipulation, respectively, between the main section and the alarm transponder via a wired or wireless communication: using wired communication media include but are not limited to a serial bus, parallel bus, a or a plurality of signal lines; wireless communication medium employed include but are not limited to, radio frequency 红外、蓝牙、磁场。 Infrared, Bluetooth, a magnetic field.
8.—种可变频型三相光伏逆变系统的控制方法,其特征在于:当系统运行在非工频状态时,系统断开并禁止接通所有其它负载;系统供电运行时,如系统供电能力下降,经问询后,断开现场应答允许断电且用户预先设定的重要等级相对较低的负载,如供电能力仍然不足,则强制断开用户预先设定的重要等级相对较低的负载,直至系统供电能力可以满足处于运行状态的全部负载;系统供电运行时,如系统供电能力提高或有负载停止工作,系统通过对比系统可提供剩余容量与所有请求供电的工频负载的功率需求,经问询后,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一接通。 8.- Method species may control the frequency of the three-phase PV inverter system, wherein: when the system is operating in a non-frequency state, the system is turned OFF and disables all other loads; runtime system power supply, the power supply system relatively low drop capabilities, the inquiry after energized and off-site response allows the user to pre-set level of importance relatively low load, such as power supply capacity is still insufficient, then forced to disconnect users pre-set level of importance load, until the system capacity to meet the power supply in the full load operating state; running power supply system, such as the system power supply or a load to improve the ability to stop working, the system may provide a system by comparing the remaining capacity of the power demand and supply all the frequency requests load , after inquiry, the response allows several on-site work load on the pilot power is turned on one by one according to the importance level preset by the user.
9.根据权利要求8所述的可变频型三相光伏逆变系统的控制方法,其特征在于:当变频负载请求供电时,视不同情形选择不同的控制对策:第一种情形,系统中没有其它负载处于运行状态,则关闭并禁止接通所有工频负载,接通请求供电的变频负载,按照用户预先设定的变频方式供电;第二种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果应答信号中有禁止断电请求,则等待,直至该禁止断电信号消失为止,视具体情况采取后面第三、第四两种情形下控制方法中的一种;第三种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果正运行的负载现场无禁止断电信号发出,但存在正在运行的负载未回复应答信号,即存在信号缺失的现象,则 The method of controlling three-phase variable frequency PV inverter system according to claim 8, wherein: when the load is requesting power frequency, depending on the case to select a different control strategies: the first case, the system does not other load is running, shut down and turn on all the banned frequency loads, the load request power conversion is turned on, the power conversion system in accordance with a predetermined user; the second case, the system has another operating state of the load is frequency when the load is issued in the scene warning, suggesting variable frequency power load application, if the response signal prohibiting power-off request, wait until the power-off prohibiting signal disappears, as the case may take back the third, fourth a method for control in both cases; the third case, the system has another operating frequency is in the load state, a warning is issued at the load site, suggesting frequency power load application, if the running load site no ban off signal is issued, but the load did not respond to the presence of a running phenomenon acknowledge signal, a signal that there is missing, then 据用户设定的逻辑进行后续操作;第四种情形,系统中有其它负载处于工频运行状态时,则在这些负载现场发出警示,提示有变频负载申请用电,如果所有正运行的负载现场无禁止断电信号发出,且所有正在运行的负载都回复了应答信号,不存在信号缺失的现象,则按照用户预先设定的变频方式供电,无论何种情况,当变频负载可以上电时,首先断开所有负载,之后接通请求供电的变频负载,并禁止其它负载上电,再后按照用户预先设定的变频方式启动、运行,当频率变为工频时,系统通过对可提供功率与所有此前断开的工频负载容量需求进行对比,经问询后,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一接通,无论何种情况,当变频负载工作完毕且断电后,首先问询各个负荷的运行现场,之后系统对比实时可提供功率与 According to the logic set by the user subsequent operations; fourth scenario, the system has another operating frequency is in the load state, a warning is issued at the load site, suggesting frequency power load application, if the site is running all loads no ban off signal is issued, and all loads are running replied response signal, the signal missing phenomenon does not exist, according to a preset user-conversion mode power supply, no matter what the situation, when the inverter can power up the load, first disconnect all loads, after turning on the power supply frequency load request, and prohibits the other electrical load, then after the start conversion system according to a user preset operation, when the frequency becomes frequency, power may be provided by the system All previously disconnected and the load capacity requirements for frequency comparison, after the inquiry, the response allows several on-site work load on the pilot power is turned on one by one according to the importance level preset by the user, no matter what the situation, when the load frequency after the work is completed and off, the respective first load the operating site inquiry, then the system may provide real-time comparison of power 先前断开的所有工频负载容量,对现场应答允许上电的若干工频负载依照用户预先设定的重要等级逐一恢复供电。 All previously disconnected frequency load capacity, allows on-site response on several frequency power load in accordance with the level of importance of the recovery of power by one preset by the user.
10.根据权利要求8至权利要求9所述的可变频型三相光伏逆变系统的控制方法,其特征在于:工频负载请求供电时,视不同情形选择不同的控制对策:第一种情形,没有其它负载运行,则直接为该工频负载通`电;第二种情形,有其它负载运行在工频状态,且系统可提供剩余容量能够满足请求供电的工频负载的功率要求时,直接接通供电;第三种情形,有其它负载运行在工频状态,且系统可提供剩余容量不能满足请求供电的工频负载的功率要求时,经问询后,现场应答允许断电的重要等级比其低的负载功率与系统剩余容量总和可以满足请求供电的工频负载,则系统断开允许断电的重要等级比其低的负载,并对请求供电的工频负载通电;上述三种情形之外的境况,请求供电的工频负载必须等待。 The method of controlling three-phase variable frequency PV inverter system 10.8 to claim according to claim 9, wherein: when a load request power frequency, depending on the case to select a different control strategies: the first case when the second case, in the other frequency load operation state, and the remaining capacity of the system can be provided to meet the load request power frequency power requirements; no other load operation, the load on workers for the direct frequency electrical ` directly connected to the power supply; when the third case, in other frequency load operation state, and the system may provide the remaining capacity of the power supply can not meet the request frequency load power requirements, after the inquiry, a response field allowing significant outages level lower than the sum of the remaining load capacity of its power supply system can meet the request of load frequency, the system allows disconnection of power-off level of importance lower than the load, and requesting power load power frequency; the three situation outside the case, requesting power load must wait for the frequency.
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