CN103986183B - A kind of grid-connected control system - Google Patents
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Abstract
本发明涉及光伏发电领域,尤其涉及一种光伏并网控制系统,包括:光伏组件;逆变器;交流负载和电网,其接收逆变器输送的正弦交流电,电网和交流负载之间设置有变压器;DSP控制器,其输入端通过电压采样器与逆变器的输出端电连接,DSP控制器的输出端分别与交流负载和电网电连接,电压采样器实时采集逆变器输送的正弦交流电的电压值,并将采集到的电压值传送至DSP控制器,DSP控制器将电压采样器输送的电压值与交流负载所需的额定电压值进行比较,通过多个功能切换开关控制交流负载与电网的连通情况。本发明根据交流负载的需要输送相应大小的电压,最大限度降低因输送电压过高或过低对交流负载造成的损害,延长交流负载的使用寿命。
The present invention relates to the field of photovoltaic power generation, in particular to a photovoltaic grid-connected control system, comprising: a photovoltaic module; an inverter; an AC load and a power grid, which receives sinusoidal alternating current delivered by the inverter, and a transformer is arranged between the power grid and the AC load ; DSP controller, its input terminal is electrically connected with the output terminal of the inverter through the voltage sampler, the output terminal of the DSP controller is respectively connected with the AC load and the power grid, and the voltage sampler collects the sinusoidal alternating current delivered by the inverter in real time Voltage value, and the collected voltage value is sent to the DSP controller, the DSP controller compares the voltage value delivered by the voltage sampler with the rated voltage value required by the AC load, and controls the AC load and the power grid through multiple function switching switches connectivity. The invention transmits a corresponding voltage according to the requirement of the AC load, minimizes the damage to the AC load caused by the transmission voltage being too high or too low, and prolongs the service life of the AC load.
Description
技术领域technical field
本发明涉及光伏发电领域,尤其涉及一种光伏并网控制系统。The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic grid-connected control system.
背景技术Background technique
光伏并网发电系统就是太阳能光伏发电系统与常规电网相连,共同承担供电任务。当有阳光时,逆变器将光伏系统所发的直流电逆变成正弦交流电,产生的交流电可以直接供给交流负载,然后将剩余的电能输入电网,或者直接将产生的全部电能并入电网。在没有太阳时,负载用电全部由电网供给。由于光强时刻处于变化中,光伏系统接收利用的光能也是变化的,从而造成产生的电能大小也不是固定不变的,而交流负载正常工作时所需要的电压是一定的,若将光伏系统所发的电能直接全部供给交流负载,可能会因电压过高或过低对交流负载造成不同程度的损害,缩短交流负载的使用寿命。The photovoltaic grid-connected power generation system is that the solar photovoltaic power generation system is connected to the conventional power grid to jointly undertake the power supply task. When there is sunlight, the inverter inverts the direct current generated by the photovoltaic system into sinusoidal alternating current, and the generated alternating current can be directly supplied to the alternating current load, and then the remaining electric energy is input into the grid, or all the generated electric energy is directly integrated into the grid. When there is no sun, all load electricity is supplied by the grid. Since the light intensity is changing all the time, the light energy received and utilized by the photovoltaic system is also changing, so the amount of electric energy generated is not fixed, and the voltage required for the normal operation of the AC load is certain. If the photovoltaic system All the generated electric energy is directly supplied to the AC load, which may cause varying degrees of damage to the AC load due to excessively high or low voltage, and shorten the service life of the AC load.
发明内容Contents of the invention
针对上述技术问题,本发明设计开发了一种光伏并网控制系统,目的在于能够实时监测逆变器输送的电压大小,并根据交流负载的需要输送相应大小的电压,最大限度降低因输送电压过高或过低对交流负载造成的损害,延长交流负载的使用寿命。In view of the above technical problems, the present invention designs and develops a photovoltaic grid-connected control system, the purpose of which is to be able to monitor the voltage delivered by the inverter in real time, and deliver a corresponding voltage according to the needs of the AC load, so as to minimize the damage caused by excessive transmission voltage. High or too low damage to the AC load, prolong the service life of the AC load.
本发明提供的技术方案为:The technical scheme provided by the invention is:
一种光伏并网控制系统,包括:A photovoltaic grid-connected control system, comprising:
光伏组件,其将接收的太阳辐射能量经过高频直流转化成高压直流电;Photovoltaic modules, which convert the received solar radiation energy into high-voltage direct current through high-frequency direct current;
逆变器,其将所述光伏组件输出的高压直流电逆变为正弦交流电;an inverter, which inverts the high-voltage direct current output by the photovoltaic module into a sinusoidal alternating current;
交流负载和电网,其接收所述逆变器输送的正弦交流电,电网和交流负载之间设置有变压器;AC load and grid, which receive the sinusoidal AC power delivered by the inverter, and a transformer is arranged between the grid and the AC load;
DSP控制器,其输入端通过电压采样器与所述逆变器的输出端电连接,所述DSP控制器的输出端分别与所述交流负载和电网电连接,所述电压采样器实时采集所述逆变器输送的正弦交流电的电压值,并将采集到的电压值传送至所述DSP控制器,所述DSP控制器将所述电压采样器输送的电压值与所述交流负载所需的额定电压值进行比较,通过多个功能切换开关控制所述交流负载与电网的连通。DSP controller, its input end is electrically connected with the output end of described inverter through the voltage sampler, the output end of described DSP controller is respectively connected with described AC load and grid electricity, and described voltage sampler collects all in real time The voltage value of the sinusoidal alternating current delivered by the inverter, and the collected voltage value is sent to the DSP controller, and the DSP controller compares the voltage value delivered by the voltage sampler with the required value of the AC load. The rated voltage value is compared, and the connection between the AC load and the power grid is controlled through multiple function switching switches.
优选的是,所述的光伏并网控制系统中,若所述电压采样器输送的电压值小于所述交流负载所需的额定电压值,则将所述DSP控制器与所述交流负载之间的第一功能切换开关连通,同时接通所述DSP控制器与所述电网之间的第二功能切换开关以及电网和交流负载之间的第三功能切换开关,所述变压器在所述DSP控制器的作用下将所述交流负载所需的额定电压值与所述电压采样器输送的电压值的差值输送至所述交流负载;若所述电压采样器输送的电压值大于所述交流负载所需的额定电压值,则将所述DSP控制器与所述交流负载之间的第一功能切换开关连通,同时接通所述DSP控制器与所述电网之间的第二功能切换开关,断开电网和交流负载之间的第三功能切换开关,将多余的电压输送至电网中;若所述电压采样器输送的电压值等于所述交流负载所需的额定电压值,则将所述DSP控制器与所述交流负载之间的第一功能切换开关连通,同时断开所述DSP控制器与所述电网之间的第二功能切换开关以及电网和交流负载之间的第三功能切换开关。Preferably, in the photovoltaic grid-connected control system, if the voltage value delivered by the voltage sampler is less than the rated voltage value required by the AC load, the connection between the DSP controller and the AC load The first function switching switch is connected, and the second function switching switch between the DSP controller and the power grid and the third function switching switch between the power grid and the AC load are turned on at the same time, and the transformer is controlled by the DSP Under the action of the AC load, the difference between the rated voltage value required by the AC load and the voltage value delivered by the voltage sampler is delivered to the AC load; if the voltage value delivered by the voltage sampler is greater than the AC load required rated voltage value, connect the first function switching switch between the DSP controller and the AC load, and simultaneously turn on the second function switching switch between the DSP controller and the grid, Disconnect the third function switching switch between the grid and the AC load, and deliver the excess voltage to the grid; if the voltage value delivered by the voltage sampler is equal to the rated voltage value required by the AC load, the The first function switching switch between the DSP controller and the AC load is connected, and the second function switching switch between the DSP controller and the grid and the third function switching between the grid and the AC load are disconnected at the same time switch.
优选的是,所述的光伏并网控制系统中,所述第一至第三功能切换开关为机械开关或电子开关。Preferably, in the photovoltaic grid-connected control system, the first to third function switching switches are mechanical switches or electronic switches.
优选的是,所述的光伏并网控制系统中,所述光伏组件包括40~50片太阳能电池,所述太阳能电池封装在边框中。Preferably, in the photovoltaic grid-connected control system, the photovoltaic module includes 40-50 solar cells, and the solar cells are packaged in the frame.
优选的是,所述的光伏并网控制系统中,所述太阳能电池每5片串联成第一太阳能电池组,每两个第一太阳能电池组并联成第二太阳能电池组,每两个第二太阳能电池组串联成第三太阳能电池组,所述第三太阳能电池组并联成所述光伏组件。Preferably, in the photovoltaic grid-connected control system, every five solar cells are connected in series to form a first solar battery group, every two first solar battery groups are connected in parallel to form a second solar battery group, and every two second The solar cell groups are connected in series to form a third solar cell group, and the third solar cell groups are connected in parallel to form the photovoltaic module.
本发明所述的光伏并网控制系统中,所述电压采样器实时采集所述逆变器输送的正弦交流电的电压值,并将采集到的电压值传送至所述DSP控制器,所述DSP控制器将所述电压采样器输送的电压值与所述交流负载所需的额定电压值进行比较,根据二者差值的大小控制所述第一功能切换开关、第二功能切换开关和第三功能切换开关的连通情况,从而实现实时监测逆变器输送的电压大小,并根据交流负载的需要输送相应大小的电压,将光伏组件产生的多余电压输入电网,并利用电网补足所述光伏组件不足以支持交流负载正常工作所需的电压差,最大限度降低因输送电压过高或过低对交流负载造成的损害,延长交流负载的使用寿命。光伏组件的太阳能电池采用多次串联多次并联的连接方式,提高了光伏组件对太阳能的利用率。In the photovoltaic grid-connected control system of the present invention, the voltage sampler collects the voltage value of the sinusoidal alternating current delivered by the inverter in real time, and transmits the collected voltage value to the DSP controller, and the DSP The controller compares the voltage value delivered by the voltage sampler with the rated voltage value required by the AC load, and controls the first function switch, the second function switch and the third function switch according to the difference between the two. The function switches the connection of the switch, so as to realize the real-time monitoring of the voltage delivered by the inverter, and transmit the corresponding voltage according to the needs of the AC load, input the excess voltage generated by the photovoltaic module into the grid, and use the grid to make up for the shortage of the photovoltaic module To support the voltage difference required for the normal operation of the AC load, minimize the damage to the AC load caused by the transmission voltage being too high or too low, and prolong the service life of the AC load. The solar cells of the photovoltaic module are connected multiple times in series and multiple times in parallel, which improves the utilization rate of solar energy of the photovoltaic module.
附图说明Description of drawings
图1是本发明所述的光伏并网控制系统的示意图。Fig. 1 is a schematic diagram of a photovoltaic grid-connected control system according to the present invention.
具体实施方式detailed description
下面结合附图对本发明做进一步的详细说明,以令本领域技术人员参照说明书文字能够据以实施。The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
如图1所示,本发明提供一种光伏并网控制系统,包括:As shown in Figure 1, the present invention provides a photovoltaic grid-connected control system, including:
光伏组件,其将接收的太阳辐射能量经过高频直流转化成高压直流电,一个太阳能电池只能产生大约0.5V的电压,远低于实际使用所需电压,为了满足实际使用所需电压,需要把太阳能电池连接成组件;Photovoltaic modules, which convert the received solar radiation energy into high-voltage direct current through high-frequency direct current, a solar cell can only generate a voltage of about 0.5V, which is far lower than the voltage required for actual use. In order to meet the required voltage for actual use, it is necessary to The solar cells are connected into modules;
逆变器,其将所述光伏组件输出的高压直流电逆变为正弦交流电,由于太阳能电池发出的是直流电,而一般的负载是交流负载,所以需要逆变器将光伏组件输出的高压直流电逆变为正弦交流电;Inverter, which inverts the high-voltage direct current output by the photovoltaic module into sinusoidal alternating current. Since the solar cell emits direct current, and the general load is an alternating current load, an inverter is required to invert the high-voltage direct current output by the photovoltaic module is a sinusoidal alternating current;
交流负载和电网,其接收所述逆变器输送的正弦交流电,电网和交流负载之间设置有变压器,变压器将电网输出的电压进行降压后输送给交流负载;An AC load and a power grid, which receive the sinusoidal AC power delivered by the inverter, a transformer is arranged between the grid and the AC load, and the transformer reduces the voltage output by the power grid and then sends it to the AC load;
DSP控制器,其输入端通过电压采样器与所述逆变器的输出端电连接,所述DSP控制器的输出端分别与所述交流负载和电网电连接,所述电压采样器实时采集所述逆变器输送的正弦交流电的电压值,并将采集到的电压值传送至所述DSP控制器,所述DSP控制器将所述电压采样器输送的电压值与所述交流负载所需的额定电压值进行比较,通过多个功能切换开关控制所述交流负载与电网的连通,保证交流负载正常工作所需的额定电压。DSP controller, its input end is electrically connected with the output end of described inverter through the voltage sampler, the output end of described DSP controller is respectively connected with described AC load and grid electricity, and described voltage sampler collects all in real time The voltage value of the sinusoidal alternating current delivered by the inverter, and the collected voltage value is sent to the DSP controller, and the DSP controller compares the voltage value delivered by the voltage sampler with the required value of the AC load. The rated voltage value is compared, and the connection between the AC load and the power grid is controlled through multiple function switching switches to ensure the rated voltage required for the normal operation of the AC load.
所述的光伏并网控制系统中,若所述电压采样器输送的电压值小于所述交流负载所需的额定电压值,则将所述DSP控制器与所述交流负载之间的第一功能切换开关连通,同时接通所述DSP控制器与所述电网之间的第二功能切换开关以及电网和交流负载之间的第三功能切换开关,所述变压器在所述DSP控制器的作用下将电网的输出电压进行降压,并将所述交流负载所需的额定电压值与所述电压采样器输送的电压值的差值输送至所述交流负载,以保证交流负载正常工作时所需的电压;若所述电压采样器输送的电压值大于所述交流负载所需的额定电压值,则将所述DSP控制器与所述交流负载之间的第一功能切换开关连通,同时接通所述DSP控制器与所述电网之间的第二功能切换开关,断开电网和交流负载之间的第三功能切换开关,将多余的电压输送至电网中,以减小电压过高对交流负载产生的损害;若所述电压采样器输送的电压值等于所述交流负载所需的额定电压值,则将所述DSP控制器与所述交流负载之间的第一功能切换开关连通,同时断开所述DSP控制器与所述电网之间的第二功能切换开关以及电网和交流负载之间的第三功能切换开关。In the photovoltaic grid-connected control system, if the voltage value delivered by the voltage sampler is less than the rated voltage value required by the AC load, the first function between the DSP controller and the AC load The switching switch is connected, and the second function switching switch between the DSP controller and the grid and the third function switching switch between the grid and the AC load are connected at the same time, and the transformer is under the action of the DSP controller Step down the output voltage of the power grid, and deliver the difference between the rated voltage value required by the AC load and the voltage value delivered by the voltage sampler to the AC load, so as to ensure the normal operation of the AC load. voltage; if the voltage value delivered by the voltage sampler is greater than the rated voltage value required by the AC load, connect the first function switching switch between the DSP controller and the AC load, and turn on at the same time The second function switching switch between the DSP controller and the power grid disconnects the third function switching switch between the power grid and the AC load, and sends excess voltage to the power grid to reduce the impact of excessive voltage on the AC load. Damage caused by the load; if the voltage value delivered by the voltage sampler is equal to the rated voltage value required by the AC load, connect the first function switching switch between the DSP controller and the AC load, and at the same time Disconnecting the second function switching switch between the DSP controller and the grid and the third function switching switch between the grid and the AC load.
所述的光伏并网控制系统中,所述第一至第三功能切换开关为机械开关或电子开关。In the photovoltaic grid-connected control system, the first to third function switching switches are mechanical switches or electronic switches.
所述的光伏并网控制系统中,所述光伏组件包括40~50片太阳能电池,所述太阳能电池封装在边框中,边框为不锈钢边框、铝边框或非金属边框。In the photovoltaic grid-connected control system, the photovoltaic module includes 40-50 solar cells, and the solar cells are packaged in a frame, and the frame is a stainless steel frame, an aluminum frame or a non-metal frame.
所述的光伏并网控制系统中,所述太阳能电池每5片串联成第一太阳能电池组,每两个第一太阳能电池组并联成第二太阳能电池组,每两个第二太阳能电池组串联成第三太阳能电池组,所述第三太阳能电池组并联成所述光伏组件。In the photovoltaic grid-connected control system, every five solar cells are connected in series to form a first solar cell group, every two first solar cell groups are connected in parallel to form a second solar cell group, and every two second solar cell groups are connected in series into a third solar battery group, and the third solar battery group is connected in parallel to form the photovoltaic module.
尽管本发明的实施方案已公开如上,但其并不仅仅限于说明书和实施方式中所列运用,它完全可以被适用于各种适合本发明的领域,对于熟悉本领域的人员而言,可容易地实现另外的修改,因此在不背离权利要求及等同范围所限定的一般概念下,本发明并不限于特定的细节和这里示出与描述的图例。Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.
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