CN202268709U - Photovoltaic broken network relay zero crossing control circuit and system - Google Patents

Photovoltaic broken network relay zero crossing control circuit and system Download PDF

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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
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申大力
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Shenzhen Invt Electric Co Ltd
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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

一种光伏断网继电器过零控制电路及系统A zero-crossing control circuit and system for a photovoltaic disconnection relay

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 current sensor 21 for extracting all The output current I A of the inverter side circuit, and output a voltage signal V A proportional to the output current of the inverter side circuit; the voltage divider circuit 22 is used to divide the voltage signal V A , to output the divided voltage signal V A '; the non-inverting follower circuit 23 is used to perform in-phase following and impedance matching on the divided voltage signal V A ', and output a current signal proportional to the output current of the inverter side circuit I A '.

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, pin 1 of U3 , Pin 2 and pin 3 are connected to the power supply signal of plus or minus 15V, and pin 4 outputs a voltage signal V A proportional to the output current of the inverter. After being divided and lowered by resistors R2 and R27, the divided voltage signal V A is output ', the divided voltage signal V A ' is followed by the same-phase follow-up operational amplifier U2-A, and after impedance matching, the current signal I A ' that is proportional to the output current of the inverter side circuit is output.

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 optocoupler 41, a freewheeling diode circuit 42, a voltage limiting circuit 43 and a switch circuit 44. The optocoupler 41 has The primary side 411 and the secondary side 412, one input terminal of the primary side 411 receives the first power supply voltage signal V CC1 , the other input terminal receives the level signal RLY1, the input terminal of the secondary side 412 is connected to the second power supply voltage signal V CC2 , the secondary side The output terminal of the side 412 is connected to the control terminal of the switch circuit 44, which is used to convert the level signal RLY1 into a switch control signal to control the relay drive signal JDK1 to switch on or off the relay circuit 10; an input terminal of the freewheeling diode circuit 42 is connected to the first Two power supply voltage signals V CC2 , the other end is connected with the relay circuit 10, used to absorb the induced voltage generated when the coil in the relay circuit 10 is turned on to off; one end of the voltage limiting circuit 43 is connected with the output end of the freewheeling diode circuit 42, and the other One end is connected to one end of the switch circuit 44 for limiting the voltage of the coil in the relay circuit 10;

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 optocoupler 41 to control the connection or disconnection of the relay circuit 10 . The 5V voltage input by the first input power supply voltage V CC1 is input to one end of the primary side 411 of the optocoupler 41 through the resistor R3, and the level signal RLY1 is input to the other end of the primary side 411 of the optocoupler 41. When RLY1 is low, the primary side of the optocoupler 41 There is current flowing through side 411 and is turned on, the secondary side 412 of the optocoupler 41 is turned on, the 12V voltage input by the second power supply voltage V CC2 is controlled by the resistor R6 and the metal oxide field effect transistor MOSFET Q2 as the switch circuit 44 is turned on, The relay driving signal JDK1 makes the relay circuit 10 electrically conductive. Resistors R8, R9, R10 and capacitor C4 are set in parallel to form a voltage limiting circuit 43 to limit the voltage of the coil in the relay circuit 10. When the relay circuit 10 is powered on, the capacitor C4 is equivalent to an open circuit, and the second power supply voltage V CC2 can fully load the relay On the coil of the circuit 10, when the relay circuit 10 is turned on, there is a 3V voltage drop on the resistors R8, R9, and R10, so that the coil of the relay circuit 10 maintains a voltage of only 9V, so that the heat generated by the relay circuit 10 is reduced when it is turned on. When the RLY1 signal is high, the primary side 411 of the optocoupler 41 is blocked, and the secondary side 412 is disconnected so that the MOSFET Q2 as the switch circuit 44 will also be disconnected, and the relay drive signal JDK2 cannot be loaded on both ends of the coil in the relay circuit 10. Circuit 10 is also switched off. The freewheeling diode circuit 42 is composed of diodes D1 and D2 connected in parallel, and is arranged in parallel with the coil in the relay circuit 10. The coil in the relay circuit 10 is an inductive load. voltage, the anti-parallel diodes D1 and D2 will absorb the induced voltage and protect the MOSFET Q2, thereby ensuring the reliability of the circuit during operation.

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)

1.一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,1. A photovoltaic grid disconnection relay zero-crossing control circuit, used to control the connection or disconnection of the inverter side circuit and the grid side circuit, is characterized in that it includes an inverter output current detection circuit, and the 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. 2.根据权利要求1所述的光伏断网继电器过零控制电路,其特征在于,所述逆变器输出电流检测电路进一步包括:2. The photovoltaic grid disconnection relay zero-crossing control circuit according to claim 1, wherein the inverter output current detection circuit further comprises: 霍尔电流传感器,用于抽取所述逆变器侧电路的输出电流,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;The Hall current sensor is used to extract the output current of the inverter side circuit and output a voltage signal proportional to the output current of the inverter side circuit; 分压电路,用于对所述电压信号进行分压,输出分压电压信号;A voltage dividing circuit, used to divide the voltage signal and output the divided voltage signal; 同相跟随电路,用于对所述分压电压信号进行同相跟随和阻抗匹配,输出一与所述逆变器侧电路的输出电流成比例的电流信号。The in-phase follower circuit is used to perform in-phase follow and impedance matching on the divided voltage signal, and output a current signal proportional to the output current of the inverter side circuit. 3.根据权利要求1所述的光伏断网继电器过零控制电路,其特征在于,所述主控DSP电路的具体工作过程为:3. The photovoltaic grid disconnection relay zero-crossing control circuit according to claim 1, characterized in that, the specific working process of the main control DSP circuit is: 接收所述输出电流信号;receiving the output current signal; 判断是否要导通或关断继电器;Determine whether to turn on or off the relay; 需要导通或关断继电器时,检测出所述输出电流过零点;When the relay needs to be turned on or off, the zero-crossing point of the output current is detected; 对所述过零点设定一个延时时间,延时时间到达后,输出电平信号。A delay time is set for the zero-crossing point, and a level signal is output after the delay time is reached. 4.根据权利要求1或3所述的光伏断网继电器过零控制电路,其特征在于,进一步包括:4. The photovoltaic grid disconnection relay zero-crossing control circuit according to claim 1 or 3, further comprising: 输出所述电平信号至所述继电器电路接通或断开的延时时间为第二延时时间,将所述第一延时时间和所述第二延时时间之和设置成逆变器侧电路输出电流信号的半个周期时间。The delay time from outputting the level signal until the relay circuit is turned on or off is the second delay time, and the sum of the first delay time and the second delay time is set as the inverter The half cycle time of the output current signal of the side circuit. 5.根据权利要求1所述的光伏断网继电器过零控制电路,其特征在于,所述继电器驱动电路进一步包括:光耦、续流二极管电路、限压电路和开关电路,5. The photovoltaic grid disconnection relay zero-crossing control circuit according to claim 1, wherein the relay drive circuit further comprises: an optocoupler, a freewheeling diode circuit, a voltage limiting circuit and a switch circuit, 所述光耦具有原边和副边,所述原边一输入端接收第一电源电压信号,另一输入端接收所述电平信号,The optocoupler has a primary side and a secondary side, one input terminal of the primary side receives the first power supply voltage signal, and the other input terminal receives the level signal, 所述副边输入端接第二电源电压信号,所述副边输出端接所述开关电路控制端,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 input terminal of the secondary side is connected to the second power supply voltage signal, and the output terminal of the secondary side is connected to the control terminal of the switch circuit, which is used to convert the level signal into a switch control signal and control the relay driving signal to be turned on or off. said relay circuit; 所述续流二极管电路一端接所述第二电源电压信号,另一端与继电器电路连接,用于吸收所述继电器电路中线圈接通至断开时产生的感应电压;One end of the freewheeling diode circuit is connected to the second power supply voltage signal, and the other end is connected to the relay circuit for absorbing the induced voltage generated when the coil in the relay circuit is turned on and turned off; 所述限压电路一端与所述续流二极管电路输出端连接,另一端连接所述开关电路的一端,用于限制所述继电器电路中线圈的电压;One end of the voltage limiting circuit is connected to the output end of the freewheeling diode circuit, and the other end is connected to one end of the switch circuit for limiting the voltage of the coil in the relay circuit; 所述开关电路的另一端接地,用于通过所述开关电路的导通与关断控制所述继电器电路的接通或断开。The other end of the switch circuit is grounded, and is used to control the on or off of the relay circuit by turning on and off the switch circuit. 6.一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,其特征在于,6. A three-phase photovoltaic grid disconnection relay zero-crossing control system, the inverter side circuit is connected to the grid side circuit through a three-phase output and a neutral line, characterized in that, 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权利要求1-5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 for photovoltaic grid disconnection relays as described in claims 1-5.
CN2011203704075U 2011-09-30 2011-09-30 Photovoltaic broken network relay zero crossing control circuit and system Withdrawn - After Issue CN202268709U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

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