CN202268709U - Photovoltaic broken network relay zero crossing control circuit and system - Google Patents
Photovoltaic broken network relay zero crossing control circuit and system Download PDFInfo
- Publication number
- CN202268709U CN202268709U CN2011203704075U CN201120370407U CN202268709U CN 202268709 U CN202268709 U CN 202268709U CN 2011203704075 U CN2011203704075 U CN 2011203704075U CN 201120370407 U CN201120370407 U CN 201120370407U CN 202268709 U CN202268709 U CN 202268709U
- Authority
- CN
- China
- Prior art keywords
- circuit
- relay
- control
- signal
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000005288 electromagnetic effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Relay Circuits (AREA)
Abstract
本实用新型实施例提供了一种光伏断网继电器过零控制电路及系统,用于控制在逆变器电流过零时逆变器侧电路与电网侧电路接入或断开。本实用新型实施例光伏断网继电器过零控制电路包括:逆变器输出电流检测电路用于检测逆变器侧电路的输出电流,输出一与逆变器侧电路的输出电流成比例的电流信号;主控DSP电路用于接收与逆变器侧电路的输出电流成比例的电流信号,检测出与逆变器侧电路的输出电流成比例的电流信号的过零点,输出电平信号;继电器驱动电路用于将电平信号转换成开关控制信号,控制继电器驱动信号接通或断开继电器电路;继电器电路用于通过其接通或断开控制逆变器侧电路与电网侧电路的接入或断开。
The embodiment of the utility model provides a photovoltaic grid disconnection relay zero-crossing control circuit and system, which are used to control the connection or disconnection of the inverter-side circuit and the grid-side circuit when the inverter current is zero-crossing. The zero-crossing control circuit of the photovoltaic disconnection relay in the embodiment of the utility model includes: the inverter output current detection circuit is used to detect the output current of the inverter side circuit, and outputs a current signal proportional to the output current of the inverter side circuit ; The main control DSP circuit is used to receive the current signal proportional to the output current of the inverter side circuit, detect the zero crossing point of the current signal proportional to the output current of the inverter side circuit, and output the level signal; the relay drive The circuit is used to convert the level signal into a switch control signal, and control the relay driving signal to turn on or off the relay circuit; the relay circuit is used to control the connection or disconnection of the inverter side circuit and the grid side circuit through it disconnect.
Description
技术领域 technical field
本实用新型涉及电子控制领域,具体的涉及一种光伏断网继电器过零控制电路及系统。The utility model relates to the field of electronic control, in particular to a zero-crossing control circuit and system for a photovoltaic grid disconnection relay.
背景技术 Background technique
现有的光伏逆变器,使用时都需要通过开关控制接入电网。15KW以下的光伏逆变器,因为成本和体积的原因,一般采用继电器作为开关接入电网。Existing photovoltaic inverters need to be connected to the power grid through switch control during use. For photovoltaic inverters below 15KW, due to cost and volume reasons, relays are generally used as switches to connect to the grid.
继电器作为光伏逆变器的关键器件,由铁芯、线圈、衔铁、触点簧片等组成。只要在线圈两端加上一定的电压,线圈中就会流过一定的电流,从而产生电磁效应,使得常开触点吸合。当线圈断电后,电磁效应消失,常开触点释放。通常采用两组继电器控制逆变器侧与电网侧的接入或断开,当一组发生故障时,另一组还能切断电网,保证控制的安全性。如图1所示,K1、K3、K5和K7是一组继电器,K2、K4、K6和K8是另一组继电器,K1与K2串联后连接逆变器侧L1与电网侧AC_L1,K3与K4串联后连接逆变器侧L2与电网侧AC_L2,K5与K6串联后连接逆变器侧L3与电网侧AC_L3,K7与K8串联连接逆变器侧中线N与电网侧中线AC_N,每组继电器共用一个控制信号控制,K1、K3、K5和K7采用JDK1控制,K2、K4、K6和K8采用JDK2控制,通过JDK1和JDK2同时控制逆变器侧三相输入L1、L2、L3和中线N与电网侧接入或断开。As the key device of the photovoltaic inverter, the relay is composed of iron core, coil, armature, contact reed and so on. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect and making the normally open contact close. When the coil is de-energized, the electromagnetic effect disappears and the normally open contact is released. Usually, two sets of relays are used to control the connection or disconnection between the inverter side and the grid side. When one set fails, the other set can also cut off the grid to ensure the safety of the control. As shown in Figure 1, K1, K3, K5 and K7 are a group of relays, K2, K4, K6 and K8 are another group of relays, K1 and K2 are connected in series to the inverter side L1 and the grid side AC_L1, K3 and K4 Connect inverter side L2 and grid side AC_L2 after series connection, K5 and K6 connect inverter side L3 and grid side AC_L3 after series connection, K7 and K8 connect inverter side neutral line N and grid side neutral line AC_N in series, each set of relays share One control signal control, K1, K3, K5 and K7 are controlled by JDK1, K2, K4, K6 and K8 are controlled by JDK2, through JDK1 and JDK2 simultaneously control the three-phase input L1, L2, L3 on the inverter side and the neutral line N and the power grid Side connection or disconnection.
采用此种方案控制,因为信号传输过程中存在时延,会导致继电器不能在逆变器输出电流过零时开通和关断。在有电流断开时,继电器的触点往往会产生拉弧现象,导致其触点发生氧化或受损,长时间使用,会使继电器触点粘连,使得逆变器不能断开电网的连接,容易产生安全事故。同时,采用一个控制信号控制一组继电器,即一个控制信号同时控制三相输入和中线,由于逆变器侧电路中三相输入和中线的不是同时到达电流过零点,会导致一次开关中,可能只有一路的继电器是在电流过零点时动作,其他都不是在电流过零点时动作,存在触点氧化或受损的问题。With this kind of scheme control, because there is a time delay in the signal transmission process, the relay cannot be turned on and off when the inverter output current crosses zero. When the current is disconnected, the contacts of the relay will often produce arcing phenomenon, which will cause the contacts to be oxidized or damaged. If used for a long time, the contacts of the relay will stick, so that the inverter cannot disconnect the power grid. It is easy to cause safety accidents. At the same time, one control signal is used to control a group of relays, that is, one control signal controls the three-phase input and the neutral line at the same time. Since the three-phase input and the neutral line in the inverter side circuit do not reach the current zero crossing at the same time, it will cause a switch. Only one relay operates when the current crosses zero, and the others do not act when the current crosses zero, and there is a problem of contact oxidation or damage.
实用新型内容 Utility model content
本实用新型实施例提供了一种光伏断网继电器过零控制电路,用于控制在逆变器电流过零时逆变器侧电路与电网侧电路接入或断开,延长继电器使用寿命和增加电路安全性。The embodiment of the utility model provides a zero-crossing control circuit of the photovoltaic grid disconnection relay, which is used to control the connection or disconnection of the inverter side circuit and the grid side circuit when the inverter current is zero, so as to prolong the service life of the relay and increase the circuit security.
本实用新型实施例又提供了一种三相光伏断网继电器过零控制系统,用于采用独立的控制信号控制每个继电器,保证每个继电器触点都会在逆变器侧电路输出电流过零时刻动作,延长继电器使用寿命和增加电路安全性。The embodiment of the utility model also provides a three-phase photovoltaic disconnection relay zero-crossing control system, which is used to control each relay with an independent control signal, so as to ensure that the output current of each relay contact will cross zero at the inverter side circuit Always act, prolong the service life of the relay and increase the safety of the circuit.
依据本实用新型实施例提供的一种光伏断网继电器过零控制电路,用于控制逆变器侧电路与电网侧电路的接入或断开,其特征在于,包括逆变器输出电流检测电路,主控数字信号处理DSP电路、继电器驱动电路和继电器电路,According to the embodiment of the utility model, a photovoltaic grid disconnection relay zero-crossing control circuit is used to control the connection or disconnection of the inverter side circuit and the grid side circuit, and is characterized in that it includes an inverter output current detection circuit , main control digital signal processing DSP circuit, relay drive circuit and relay circuit,
所述逆变器输出电流检测电路用于检测所述逆变器侧电路的输出电流,输出一与逆变器侧电路的输出电流成比例的电流信号;The inverter output current detection circuit is used to detect the output current of the inverter side circuit, and output a current signal proportional to the output current of the inverter side circuit;
所述主控DSP电路用于接收所述与逆变器侧电路的输出电流成比例的电流信号,检测出所述与逆变器侧电路的输出电流成比例的电流信号的过零点,并对所述过零点设定第一延时时间,所述第一延时时间到达后,输出电平信号;The main control DSP circuit is used to receive the current signal proportional to the output current of the inverter side circuit, detect the zero-crossing point of the current signal proportional to the output current of the inverter side circuit, and A first delay time is set at the zero-crossing point, and a level signal is output after the first delay time is reached;
所述继电器驱动电路用于将所述电平信号转换成开关控制信号,控制继电器驱动信号接通或断开所述继电器电路;The relay drive circuit is used to convert the level signal into a switch control signal, and control the relay drive signal to turn on or off the relay circuit;
所述继电器电路用于通过其接通或断开控制逆变器侧电路与电网侧电路的接入或断开。The relay circuit is used to control the connection or disconnection of the inverter-side circuit and the grid-side circuit through it being turned on or off.
依据本实用新型又一实施例提供的一种三相光伏断网继电器过零控制系统,逆变器侧电路通过三相输出和一根中线与电网侧电路连接,According to a three-phase photovoltaic grid disconnection relay zero-crossing control system provided in another embodiment of the utility model, the inverter side circuit is connected to the grid side circuit through a three-phase output and a neutral line,
采用两组继电器组对所述逆变器侧电路和所述电网侧电路进行连接控制,每组继电器组各自包含四个继电器分别对三相输出和一根中线四路信号进行控制,每路信号中对应的两个继电器串联设置,所述每一个继电器采用一个独立的如本实用新型实施例所述的光伏断网继电器过零控制电路进行控制。Two groups of relay groups are used to connect and control the inverter side circuit and the grid side circuit. Each group of relay groups contains four relays respectively to control the three-phase output and one neutral line four-way signal. Each signal The corresponding two relays are arranged in series, and each of the relays is controlled by an independent zero-crossing control circuit of the photovoltaic grid disconnection relay as described in the embodiment of the present invention.
从以上技术方案可以看出,本实用新型实施例具有以下优点:As can be seen from the above technical solutions, the utility model embodiment has the following advantages:
(1)检测到输出电流过零点后第一延时时间后输出电平信号,输出电平信号至所述继电器电路接通或断开存在第二延时时间,将第一延时时间和第二延时时间设置成逆变器侧电流的半个周期时间,可保证继电器在输出电流过零点接通或断开,避免拉弧现象,继电器触点不会因为有电流时接通或关断产生触点氧化和粘连,保证了继电器控制的安全性;(1) Output the level signal after the first delay time after the zero crossing of the output current is detected, and there is a second delay time from the output level signal until the relay circuit is turned on or off, and the first delay time and the second delay time The second delay time is set to half a cycle time of the inverter side current, which can ensure that the relay is turned on or off at the zero-crossing point of the output current to avoid arcing, and the relay contacts will not be turned on or off due to current. Oxidation and adhesion of contacts occur, which ensures the safety of relay control;
(2)每个继电器采用单独的控制信号进行电流过零点导通和关断,可保证每一路继电器都在零电流时接通或断开,保证了每一路继电器控制的安全性。(2) Each relay uses a separate control signal to conduct current zero-crossing on and off, which can ensure that each relay is turned on or off at zero current, ensuring the safety of each relay control.
附图说明 Description of drawings
图1是现有技术电网继电器结构示意图;Fig. 1 is a schematic structural diagram of a grid relay in the prior art;
图2是本实用新型实施例光伏断网继电器过零控制电路的原理框图;Fig. 2 is a functional block diagram of the zero-crossing control circuit of the photovoltaic disconnection relay of the utility model embodiment;
图3是本实用新型实施例光伏断网继电器过零控制电路中逆变器输出电流检测电路的原理框图;Fig. 3 is a functional block diagram of the inverter output current detection circuit in the zero-crossing control circuit of the photovoltaic disconnection relay in the embodiment of the utility model;
图4是本实用新型实施例光伏断网继电器过零控制电路中逆变器输出电流检测电路的电路原理图;Fig. 4 is a schematic circuit diagram of the inverter output current detection circuit in the zero-crossing control circuit of the photovoltaic grid disconnection relay in the embodiment of the present invention;
图5是本实用新型实施例光伏断网继电器过零控制电路中继电器驱动电路的原理框图;Fig. 5 is a functional block diagram of the relay drive circuit in the zero-crossing control circuit of the photovoltaic grid disconnection relay in the embodiment of the present invention;
图6是本实用新型实施例光伏断网继电器过零控制电路中继电器驱动电路的电路原理图;Fig. 6 is a schematic circuit diagram of the relay drive circuit in the zero-crossing control circuit of the photovoltaic grid disconnection relay in the embodiment of the present invention;
图7是本实用新型实施例三相光伏断网继电器过零控制系统结构示意图。Fig. 7 is a schematic structural diagram of a zero-crossing control system of a three-phase photovoltaic network disconnection relay according to an embodiment of the present invention.
具体实施方式 Detailed ways
本实用新型实施例提供了一种光伏断网继电器过零控制电路,用于控制在逆变器电流过零时逆变器侧电路与电网侧电路接入或断开。The embodiment of the utility model provides a zero-crossing control circuit of a photovoltaic grid disconnection relay, which is used to control the connection or disconnection of the inverter-side circuit and the grid-side circuit when the inverter current is zero-crossing.
本实用新型实施例又提供了一种光伏断网继电器过零控制系统,用于采用独立的控制信号控制每个继电器,保证每个继电器触点都会在逆变器侧电路输出电流过零时刻动作。The embodiment of the utility model also provides a zero-crossing control system for photovoltaic grid disconnection relays, which is used to control each relay with an independent control signal, so as to ensure that each relay contact will act when the output current of the inverter side circuit crosses zero. .
以下结合附图对本实用新型的几个优选实施例进行详细描述,但本实用新型并不仅仅限于这些实施例。本实用新型涵盖任何在本实用新型的精髓和范围上做的替代、修改、等效方法以及方案。为了使公众对本实用新型有彻底的了解,在以下本实用新型优选实施例中详细说明了具体的细节,而对本领域技术人员来说没有这些细节的描述也可以完全理解本实用新型。另外,为了避免对本实用新型的实质造成不必要的混淆,并没有详细说明众所周知的方法、过程、流程、元件和电路等。Several preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments. The utility model covers any replacement, modification, equivalent method and scheme made on the spirit and scope of the utility model. In order to make the public have a thorough understanding of the utility model, specific details are described in the following preferred embodiments of the utility model, and those skilled in the art can fully understand the utility model without the description of these details. In addition, in order to avoid unnecessary confusion to the essence of the present invention, well-known methods, procedures, processes, components and circuits are not described in detail.
参见图2,所示为本实用新型实施例三相光伏断网继电器过零控制电路的原理框图,包括逆变器输出电流检测电路20,主控DSP电路30、继电器驱动电路40和继电器电路10,逆变器输出电流检测电路20用于检测逆变器侧电路的输出电流IA,输出一与逆变器侧电路的输出电流成比例的电流信号IA’;主控DSP电路用于接收与逆变器侧电路的输出电流成比例的电流信号IA’,检测出与逆变器侧电路的输出电流成比例的电流信号IA’的过零点,并对过零点设定第一延时时间t1,第一延时时间t1到达后,输出电平信号RLY1;继电器驱动电路用于将电平信号RLY1转换成开关控制信号,控制继电器驱动信号JDK1接通或断开继电器电路10中线圈;继电器电路10用于通过其接通或断开控制逆变器侧电路50与电网侧电路60的接入或断开。Referring to Fig. 2, it is a functional block diagram of the zero-crossing control circuit of the three-phase photovoltaic grid disconnection relay of the embodiment of the present invention, including the inverter output current detection circuit 20, the main control DSP circuit 30, the relay drive circuit 40 and the relay circuit 10 , the inverter output current detection circuit 20 is used to detect the output current IA of the inverter side circuit, and outputs a current signal IA' proportional to the output current of the inverter side circuit; the main control DSP circuit is used for receiving and inverting The current signal IA' proportional to the output current of the inverter side circuit, detect the zero crossing point of the current signal IA' proportional to the output current of the inverter side circuit, and set the first delay time t1 for the zero crossing point, After the first delay time t1 arrives, output the level signal RLY1; the relay drive circuit is used to convert the level signal RLY1 into a switch control signal, and control the relay drive signal JDK1 to turn on or off the coil in the relay circuit 10; the relay circuit 10 It is used to control the connection or disconnection of the inverter-side circuit 50 and the grid-side circuit 60 through it.
通过本实施例,逆变器侧电路通过继电器电路与电网侧电路连接,通过主控DSP电路在检测出的与逆变器侧输出电流成比例的输出电流过零点时设定一个延时时间,在延时时间到达后输出一个电平信号去控制继电器,可保证继电器在下一个输出电流过零点时闭合或断开,避免了继电器在有电流时闭合或断开时产生的拉弧现象,使得继电器触点氧化受损,可保证继电器电路的安全使用。Through this embodiment, the inverter side circuit is connected to the grid side circuit through the relay circuit, and a delay time is set when the detected output current proportional to the output current of the inverter side crosses zero through the main control DSP circuit, After the delay time is up, a level signal is output to control the relay, which can ensure that the relay is closed or disconnected when the next output current crosses zero, avoiding the arcing phenomenon when the relay is closed or disconnected when there is current, so that the relay The contacts are oxidized and damaged, which can ensure the safe use of the relay circuit.
具体地,以下结合图3至图6详细说明本实用新型实施例光伏断网继电器过零控制电路的实施过程。Specifically, the implementation process of the zero-crossing control circuit of the photovoltaic grid disconnection relay of the embodiment of the present utility model will be described in detail below in conjunction with FIGS. 3 to 6 .
参见图3,所示为本实用新型实施例光伏断网继电器过零控制电路中逆变器输出电流检测电路的原理框图,逆变器电流检测电路20包括霍尔电流传感器21,用于抽取所述逆变器侧电路的输出电流IA,并输出一与所述逆变器侧电路的输出电流成比例的电压信号VA;分压电路22,用于对所述电压信号进行分压VA,输出分压电压信号VA’;同相跟随电路23,用于对所述分压电压信号VA’进行同相跟随和阻抗匹配,输出与逆变器侧电路的输出电流成比例的电流信号IA’。Referring to FIG. 3 , it shows a functional block diagram of the inverter output current detection circuit in the zero-crossing control circuit of the photovoltaic grid disconnection relay according to the embodiment of the present utility model. The inverter current detection circuit 20 includes a Hall
逆变器输出电流检测电路20的具体应用实例参见图4,U3是PCB插装的霍尔电流传感器,IA_IN和IA_OUT是逆变器侧电路在PCB板上的走线,U3的1脚、2脚、3脚是连接正负15V的电源信号,4脚输出与逆变器输出电流成比例的电压信号VA,经过电阻R2、R27分压降压后,输出分压电压信号VA’,分压电压信号VA’再经过同相跟随运放U2-A的同相跟随,进行阻抗匹配后,输出与逆变器侧电路的输出电流成比例的电流信号IA’。Refer to Figure 4 for a specific application example of the inverter output current detection circuit 20, U3 is a Hall current sensor inserted into the PCB, I A_IN and I A_OUT are the wiring of the inverter side circuit on the PCB,
经过逆变器输出电流检测电路20输出的与逆变器侧电路的输出电流成比例的电流信号IA’输入至主控DSP电路30,主控DSP电路30的具体工作过程为:判断是否要导通或关断继电器;需要导通或关断继电器时,检测出与逆变器侧电路的输出电流成比例的电流信号IA’过零点;检测到逆变器输出电流过零点后,设定第一延时时间t1,第一延时时间t1到达后,输出电平信号RLY1。因为主控DSP输出电平信号RLY1转换成继电器触点动作会有第二延时时间t2,因此将t1+t2设置成逆变器侧电路输出电流信号的半个周期时间,可保证继电器电路在下一个电流过零点时开通或关断,从而使得继电器在电流为零时接通或断开,避免拉弧现象,触点也不会氧化和粘连,提高安全性。The current signal I A ' that is proportional to the output current of the inverter side circuit output through the inverter output current detection circuit 20 is input to the main control DSP circuit 30, and the specific working process of the main control DSP circuit 30 is: judge whether to Turn on or off the relay; when the relay needs to be turned on or off, detect the zero-crossing point of the current signal I A ' that is proportional to the output current of the inverter side circuit; after detecting the zero-crossing point of the inverter output current, set The first delay time t1 is set, and the level signal RLY1 is output after the first delay time t1 is reached. Because there will be a second delay time t2 when the main control DSP output level signal RLY1 is converted into a relay contact action, so setting t1+t2 as half a cycle time of the output current signal of the inverter side circuit can ensure that the relay circuit operates in the next step. It is turned on or off when a current crosses zero, so that the relay is turned on or off when the current is zero, avoiding arcing, and the contacts will not be oxidized and stuck, improving safety.
主控DSP电路30输出的电平信号RLY1输出至继电器驱动电路40进行处理,继电器驱动电路40进一步包括:光耦41、续流二极管电路42、限压电路43和开关电路44,光耦41具有原边411和副边412,原边411一输入端接收第一电源电压信号VCC1,另一输入端接收所述电平信号RLY1,副边412输入端接第二电源电压信号VCC2,副边412输出端接开关电路44控制端,用于将电平信号RLY1转换成开关控制信号,控制继电器驱动信号JDK1接通或断开继电器电路10;续流二极管电路42一输入端接所述第二电源电压信号VCC2,另一端与继电器电路10连接,用于吸收继电器电路10中线圈接通至断开时产生的感应电压;限压电路43一端与续流二极管电路42输出端连接,另一端连接开关电路44的一端,用于限制继电器电路10中线圈的电压;开关电路44的另一端接地,通过开关电路44的导通与关断控制继电器电路10的接通或断开。The level signal RLY1 output by the main control DSP circuit 30 is output to the relay drive circuit 40 for processing. The relay drive circuit 40 further includes: an
继电器驱动电路40的具体应用实例参见图6,RLY1是来自主控DSP电路30的电平信号,电平信号RLY1通过光耦41转换成开关控制信号能够控制继电器电路10的连接或断开。第一输入电源电压VCC1输入的5V电压通过电阻R3输入光耦41的原边411一端,电平信号RLY1输入光耦41原边411的另一端,当RLY1为低时,光耦41的原边411有电流流过并导通,光耦41的副边412导通,第二电源电压VCC2输入的12V电压经过电阻R6控制作为开关电路44的金属氧化物场效应管MOSFET Q2导通,继电器驱动信号JDK1使得继电器电路10得电导通。电阻R8、R9、R10和电容C4并联设置组成限压电路43限制继电器电路10中线圈的电压,在继电器电路10得电导通时,电容C4相当于断路,第二电源电压VCC2能够完全加载继电器电路10的线圈上,当继电器电路10导通后,电阻R8、R9、R10上面有3V电压降,使得继电器电路10线圈保持电压只有9V,这样使得继电器电路10在导通时发热减少。当RLY1信号为高时,光耦41的原边411不通,副边412断开使得作为开关电路44的MOSFET Q2也会断开,继电器驱动信号JDK2无法加载在继电器电路10中线圈两端,继电器电路10也会关断。续流二极管电路42由二极管D1和D2并联组成,并与继电器电路10中线圈并联设置,继电器电路10中线圈是感性负载,MOSFET Q2由导通到截止时,线圈两端会产生较高的感应电压,反并联二极管D1、D2就会吸收感应电压,保护MOSFET Q2,从而保证电路工作过程中的可靠性。Refer to FIG. 6 for a specific application example of the relay drive circuit 40 . RLY1 is a level signal from the main control DSP circuit 30 . The level signal RLY1 is converted into a switch control signal through the
本实用新型实施例提供的光伏断网继电器过零控制电路可应用于三相或单相光伏逆变器电路,同时本领域内的技术人员可以理解,也可应用于其他类型的逆变器电路,本实用新型对提供的光伏断网继电器过零控制电路的具体应用并不作限制。The photovoltaic disconnection relay zero-crossing control circuit provided by the embodiment of the utility model can be applied to three-phase or single-phase photovoltaic inverter circuits, and those skilled in the art can understand that it can also be applied to other types of inverter circuits , the utility model does not limit the specific application of the zero-crossing control circuit of the photovoltaic disconnection relay provided.
参见图7,所示为本实用新型实施例三相光伏断网继电器过零控制系统结构示意图,继电器作为逆变器接入电网的开关器件,其可靠性设计非常重要,因此,采用两组继电器组对逆变器侧电路和电网侧电路进行连接控制,每组继电器组各自包含四个继电器分别对三相输出和一根中线四路信号进行控制,每路信号中对应的两个继电器串联设置,所述每一个继电器采用一个独立的如本实用新型实施例提供的光伏断网继电器过零控制电路进行控制。具体的如图8所示,K1、K3、K5、K7是一组,K2、K4、K6、K8是一组,两组继电器控制能够保证当一组继电器中有故障的时候,另外正常的一组继电器能够保证逆变器和电网断开。K1与K2串联后连接逆变器侧L1与电网侧AC_L1,K3与K4串联后连接逆变器侧L2与电网侧AC_L2,K5与K6串联后连接逆变器侧L3与电网侧AC_L3,K7与K8串联连接逆变器侧中线N与电网侧中线AC_N,JDK1-JDK8分别是8个继电器的驱动信号,JDK1控制继电器K1,JDK2控制继电器K2,JDK3控制继电器K3,JDK4控制继电器K4,JDK5控制继电器K5,JDK6控制继电器K6,JDK7控制继电器K7,JDK8控制继电器K8,每个继电器采用独立的控制信号,能够保证每个继电器触点都会在逆变器输出电流过零的时刻动作,避免继电器触点氧化或粘连,提高控制系统的安全性。Referring to Figure 7, it is a schematic structural diagram of the zero-crossing control system of the three-phase photovoltaic grid disconnection relay of the embodiment of the present invention. The relay is used as a switching device for the inverter to connect to the grid, and its reliability design is very important. Therefore, two sets of relays are used The group connects and controls the inverter side circuit and the grid side circuit. Each group of relays contains four relays to control the three-phase output and one neutral line four-way signal respectively. The corresponding two relays in each signal are set in series. , each of the relays is controlled by an independent zero-crossing control circuit for photovoltaic disconnection relays as provided in the embodiment of the present invention. Specifically, as shown in Figure 8, K1, K3, K5, and K7 are a group, and K2, K4, K6, and K8 are a group. The two sets of relay control can ensure that when there is a fault in one group of relays, the other normal one A group relay can ensure that the inverter is disconnected from the grid. K1 and K2 are connected in series to inverter side L1 and grid side AC_L1; K3 and K4 are connected in series to inverter side L2 and grid side AC_L2; K5 and K6 are connected in series to inverter side L3 and grid side AC_L3; K7 and K8 is connected in series with the neutral line N on the inverter side and the neutral line AC_N on the grid side. JDK1-JDK8 are the driving signals of 8 relays respectively. JDK1 controls relay K1, JDK2 controls relay K2, JDK3 controls relay K3, JDK4 controls relay K4, and JDK5 controls relay K5, JDK6 control relay K6, JDK7 control relay K7, JDK8 control relay K8, each relay adopts independent control signal, which can ensure that each relay contact will act when the inverter output current crosses zero, avoiding relay contact Oxidation or adhesion, improve the safety of the control system.
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件完成,所述的程序可以存储于一种计算机可读存储介质中,上述提到的存储介质可以是只读存储器,磁盘或光盘等。Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the above-mentioned storage The medium can be read-only memory, magnetic or optical disk, etc.
以上对本实用新型所提供的一种三相光伏断网继电器过零控制电路、方法及系统进行了详细介绍,对于本领域的一般技术人员,依据本实用新型实施例的思想,在具体实施方式及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本实用新型的限制。The above has introduced in detail the zero-crossing control circuit, method and system of a three-phase photovoltaic network disconnection relay provided by the utility model. There will be changes in the scope of application. In summary, the content of this specification should not be understood as limiting the utility model.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2011203704075U CN202268709U (en) | 2011-09-30 | 2011-09-30 | Photovoltaic broken network relay zero crossing control circuit and system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2011203704075U CN202268709U (en) | 2011-09-30 | 2011-09-30 | Photovoltaic broken network relay zero crossing control circuit and system |
Publications (1)
Publication Number | Publication Date |
---|---|
CN202268709U true CN202268709U (en) | 2012-06-06 |
Family
ID=46159493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2011203704075U Withdrawn - After Issue CN202268709U (en) | 2011-09-30 | 2011-09-30 | Photovoltaic broken network relay zero crossing control circuit and system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN202268709U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102510081A (en) * | 2011-09-30 | 2012-06-20 | 深圳市英威腾电气股份有限公司 | Zero-cross control circuit, method and system of photovoltaic network disconnection relay |
CN109787290A (en) * | 2019-03-19 | 2019-05-21 | 矽力杰半导体技术(杭州)有限公司 | Photovoltaic system and its control circuit and control method |
-
2011
- 2011-09-30 CN CN2011203704075U patent/CN202268709U/en not_active Withdrawn - After Issue
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102510081A (en) * | 2011-09-30 | 2012-06-20 | 深圳市英威腾电气股份有限公司 | Zero-cross control circuit, method and system of photovoltaic network disconnection relay |
CN109787290A (en) * | 2019-03-19 | 2019-05-21 | 矽力杰半导体技术(杭州)有限公司 | Photovoltaic system and its control circuit and control method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103779828B (en) | Bidirectional, dc based on artificial zero passage cut-offs circuit and cutoff method thereof | |
CN106427673B (en) | Without powered off split-phase power device | |
CN102777666A (en) | Electromagnetic valve control circuit and electromagnetic valve closing self-checking method thereof | |
CN204178188U (en) | A kind of standby zero power consumption circuit and washing machine | |
CN102611189A (en) | Double-power-supply switching device and controlling method thereof | |
CN105034841A (en) | Strong electricity charging and discharging control method of hybrid electric vehicle and apparatus thereof | |
CN207801476U (en) | A kind of CPCI power supply backplanes with alternating current-direct current automatic switching function | |
CN107845519B (en) | Double power supply automatic transfer switch and its control method | |
CN105932927A (en) | Automatic control device for AC power phase sequence of air compressor | |
CN202268709U (en) | Photovoltaic broken network relay zero crossing control circuit and system | |
CN103353569A (en) | Relay connection state detecting apparatus | |
CN105652769A (en) | Relay anti-adhesion circuit and control method thereof | |
CN205453147U (en) | Three -phase unbalanced load adjusting device | |
CN102624080A (en) | A dual power supply automatic transfer switch device | |
CN205029421U (en) | Power supply switching device | |
CN103311921B (en) | A kind of power supply entering line switch and bus connection switch interlock connection circuit | |
CN102510081B (en) | Zero-cross control circuit, method and system of photovoltaic network disconnection relay | |
CN202435637U (en) | Zero-power-consumption standby control circuit of electromagnetic induction heating device | |
CN102916482A (en) | Low-voltage switching circuit | |
CN205178889U (en) | Public dc bus system of two converters after optimization | |
CN204759096U (en) | Three -way formula switching device remote monitoring terminal | |
CN202872457U (en) | Mechanical-electronic mixing type dual-supply automatic change-over switch | |
CN203365599U (en) | Relay connection state detecting device | |
CN204304829U (en) | Inverter charge switch and inverter | |
CN104134967B (en) | A neutral line disconnection protection device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
AV01 | Patent right actively abandoned |
Granted publication date: 20120606 Effective date of abandoning: 20140618 |
|
AV01 | Patent right actively abandoned |
Granted publication date: 20120606 Effective date of abandoning: 20140618 |
|
RGAV | Abandon patent right to avoid regrant |