CN106972536B - Control method and device for virtual synchronous generator of photovoltaic power station - Google Patents
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Abstract
本发明公开了一种光伏电站虚拟同步发电机的控制方法及装置，首先对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；再采集所述光伏电站并网点处的电压、电流和频率信号；利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元；所述各个光伏发电单元接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。上述方法实现了光伏电站的虚拟同步发电机功能，增强了光伏电站的安全稳定运行能力，同时能够发挥光伏电站的电压和频率控制能力。
The invention discloses a control method and device for a virtual synchronous generator of a photovoltaic power station. First, each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station is subjected to load reduction control; and then the voltage at the grid connection point of the photovoltaic power station is collected. , current and frequency signals; use the virtual synchronous generator controller to realize the virtual synchronous generator control of the photovoltaic power station, and obtain the active and reactive power reference values of each photovoltaic power generation unit; pass the power command obtained by the virtual synchronous generator controller through the optical fiber The network is sent to each photovoltaic power generation unit; each photovoltaic power generation unit receives the power command, tracks the power reference value, and realizes the power control of the photovoltaic power station. The above method realizes the virtual synchronous generator function of the photovoltaic power station, enhances the safe and stable operation capability of the photovoltaic power station, and at the same time can exert the voltage and frequency control capabilities of the photovoltaic power station.
Description
技术领域technical field
本发明涉及光伏发电系统技术领域，尤其涉及一种光伏电站虚拟同步发电机的控制方法及装置。The invention relates to the technical field of photovoltaic power generation systems, in particular to a control method and device for a virtual synchronous generator of a photovoltaic power station.
背景技术Background technique
随着新能源发电技术的不断发展，近些年来，基于电力电子逆变器接口的新能源发电(光伏发电、风力发电等)在电力系统中所占比重越来越高。世界主要国家均制定了各自的新能源发电发展计划。然而，与传统同步发电机电源相比基于电力电子逆变器接口的新能源发电系统响应速度快，将发电系统的响应与电力系统的动态响应解耦，几乎没有利于保持系统稳定运行的转动惯量和阻尼，其大量接入势必会影响到电力系统的动态特性，无法为电力系统提供必要的电压与频率支撑，为电力系统带来变革，为电力系统的稳定运行控制带来挑战。With the continuous development of new energy power generation technology, in recent years, the proportion of new energy power generation (photovoltaic power generation, wind power generation, etc.) based on power electronic inverter interface in the power system is increasing. Major countries in the world have formulated their own new energy power generation development plans. However, compared with the traditional synchronous generator power supply, the new energy power generation system based on the power electronic inverter interface has a fast response speed, and the decoupling of the response of the power generation system and the dynamic response of the power system has almost no rotational inertia that is conducive to maintaining the stable operation of the system. And damping, its large number of access will inevitably affect the dynamic characteristics of the power system, cannot provide the necessary voltage and frequency support for the power system, bring changes to the power system, and bring challenges to the stable operation and control of the power system.
针对逆变器并网的新能源发电系统，一般采用的控制策略为基于旋转坐标系的电流型控制，这种控制方法能够实现有功、无功功率的解耦控制，采用这种控制方法使新能源发电系统不具备旋转惯性和阻尼特性，不利于系统的稳定运行，采用虚拟同步发电机控制方法能够使基于逆变器并网的新能源发电系统具有类似于同步发电机的特性。但现有技术中的光伏并网系统不具备虚拟同步发电机的特性，如果对现有的光伏单元逆变器进行逐个改造比较费时、费力，而且由于各个光伏单元的逆变器独立运行，其相互之间的影响还需要进一步研究，才能保证整个光伏电站的运行性能。For the new energy power generation system with grid-connected inverters, the control strategy generally adopted is the current mode control based on the rotating coordinate system. This control method can realize the decoupling control of active and reactive power. The energy power generation system does not have the characteristics of rotational inertia and damping, which is not conducive to the stable operation of the system. Using the virtual synchronous generator control method can make the new energy power generation system based on the inverter grid-connected to have characteristics similar to the synchronous generator. However, the photovoltaic grid-connected system in the prior art does not have the characteristics of a virtual synchronous generator. It is time-consuming and laborious to retrofit the existing photovoltaic unit inverters one by one, and since the inverters of each photovoltaic unit operate independently, its The mutual influence needs further research to ensure the operation performance of the entire photovoltaic power station.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供一种光伏电站虚拟同步发电机的控制方法及装置，该方法实现了光伏电站的虚拟同步发电机功能，增强了光伏电站的安全稳定运行能力，同时能够发挥光伏电站的电压和频率控制能力。The purpose of the present invention is to provide a control method and device for a virtual synchronous generator of a photovoltaic power station, the method realizes the function of a virtual synchronous generator of a photovoltaic power station, enhances the safe and stable operation capability of the photovoltaic power station, and can exert the voltage of the photovoltaic power station at the same time. and frequency control capability.
一种光伏电站虚拟同步发电机的控制方法，所述方法包括：A control method for a virtual synchronous generator of a photovoltaic power station, the method comprising:
步骤1、对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；
步骤2、采集所述光伏电站并网点处的电压、电流和频率信号；
步骤3、利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；
步骤4、将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元；
步骤5、所述各个光伏发电单元接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。Step 5: Each photovoltaic power generation unit receives a power command, tracks a power reference value, and realizes power control of the photovoltaic power station.
在所述步骤1中，所述对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制的过程具体为：In the
通过改变各个光伏发电单元的功率参考值，使光伏发电单元的有功功率输出偏离其最大功率跟踪值。By changing the power reference value of each photovoltaic power generation unit, the active power output of the photovoltaic power generation unit deviates from its maximum power tracking value.
在所述步骤2中，具体利用电流互感器和电压互感器来采集所述光伏电站并网点处的电压、电流和频率信号。In the
在所述步骤3中，所述获得各个光伏发电单元的有功、无功功率参考值，具体包括：根据测量的电压、电流和频率信号通过虚拟同步发电机控制算法获得各个光伏单元的有功、无功功率参考值。In the
在所述步骤4中，所述功率指令为虚拟同步发电机控制的各个光伏发电单元的功率指令。In the
一种光伏电站虚拟同步发电机的控制装置，所述装置包括：A control device for a virtual synchronous generator of a photovoltaic power station, the device includes:
降载控制模块，用于对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；The load shedding control module is used to perform load shedding control on each photovoltaic power generation unit participating in the virtual synchronous generator control in the photovoltaic power station;
测量模块，用于采集所述光伏电站并网点处的电压、电流和频率信号；a measurement module for collecting voltage, current and frequency signals at the grid-connected point of the photovoltaic power station;
虚拟同步发电机控制模块，用于利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；The virtual synchronous generator control module is used to realize the virtual synchronous generator control of the photovoltaic power station by using the virtual synchronous generator controller, and obtain the active and reactive power reference values of each photovoltaic power generation unit;
通讯模块，用于将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元。The communication module is used to send the power command obtained by the virtual synchronous generator controller to each photovoltaic power generation unit through the optical fiber network.
由上述本发明提供的技术方案可以看出，上述方法实现了光伏电站的虚拟同步发电机功能，增强了光伏电站的安全稳定运行能力，同时能够发挥光伏电站的电压和频率控制能力。It can be seen from the technical solutions provided by the present invention that the above method realizes the virtual synchronous generator function of the photovoltaic power station, enhances the safe and stable operation capability of the photovoltaic power station, and can exert the voltage and frequency control capabilities of the photovoltaic power station at the same time.
附图说明Description of drawings
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他附图。In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.
图1为本发明实施例所提供光伏电站虚拟同步发电机的控制方法流程示意图；1 is a schematic flowchart of a control method for a virtual synchronous generator of a photovoltaic power station according to an embodiment of the present invention;
图2为本发明所举实例中逆变器拓扑结构及其等效的虚拟同步发电机框图；2 is a block diagram of an inverter topology and its equivalent virtual synchronous generator in the example of the present invention;
图3为本发明实施例中虚拟同步发电机控制器的控制框图示意图；3 is a schematic control block diagram of a virtual synchronous generator controller in an embodiment of the present invention;
图4为本发明实施例所举实例中的电力系统模型示意图；FIG. 4 is a schematic diagram of a power system model in an example according to an embodiment of the present invention;
图5为本发明所举实例中光伏单元输出功率的示意图；5 is a schematic diagram of the output power of the photovoltaic unit in the example of the present invention;
图6为本发明所举实例中光伏电站输出功率示意图；6 is a schematic diagram of the output power of the photovoltaic power station in the example of the present invention;
图7为本发明所举实例中电力系统的频率对比示意图；7 is a schematic diagram of the frequency comparison of the power system in the example of the present invention;
图8为本发明实施例中光伏单元的频率控制功率输出示意图；FIG. 8 is a schematic diagram of a frequency-controlled power output of a photovoltaic unit in an embodiment of the present invention;
图9为本发明实施例中光伏电站的频率控制功率输出示意图；9 is a schematic diagram of frequency control power output of a photovoltaic power station in an embodiment of the present invention;
图10为本发明实施例所提供的光伏电站虚拟同步发电机的控制装置示意图。FIG. 10 is a schematic diagram of a control device of a virtual synchronous generator of a photovoltaic power station provided by an embodiment of the present invention.
具体实施方式Detailed ways
下面结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明的保护范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
本发明实施例提供了一种更为有效简洁的光伏电站虚拟同步发电机的控制方法，能够较为容易的建立光伏电站的虚拟同步发电机控制功能，提高光伏电站的稳定运行能力和对频率、电压的控制能力。下面将结合附图对本发明实施例作进一步地详细描述，如图1所示为本发明实施例所提供光伏电站虚拟同步发电机的控制方法流程示意图，所述方法包括：The embodiments of the present invention provide a more effective and concise control method for a virtual synchronous generator of a photovoltaic power station, which can easily establish a virtual synchronous generator control function of the photovoltaic power station, improve the stable operation ability of the photovoltaic power station and the control of frequency and voltage. control ability. The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. FIG. 1 is a schematic flowchart of a control method for a virtual synchronous generator of a photovoltaic power station provided by an embodiment of the present invention, and the method includes:
步骤1、对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；
在该步骤1中，对各个光伏发电单元进行降载控制的过程具体为：In this
通过改变各个光伏发电单元的功率参考值，使光伏发电单元的有功功率输出偏离其最大功率跟踪值(根据当时的光照强度光伏单元能够发出的最大功率)，从而为光伏发电单元参与虚拟同步发电机控制留出备用容量。By changing the power reference value of each photovoltaic power generation unit, the active power output of the photovoltaic power generation unit deviates from its maximum power tracking value (the maximum power that the photovoltaic unit can emit according to the current light intensity), so as to participate in the virtual synchronous generator for the photovoltaic power generation unit Controls setting aside spare capacity.
步骤2、采集所述光伏电站并网点处的电压、电流和频率信号；
该步骤中，具体是利用电流互感器和电压互感器来采集所述光伏电站并网点处的电压、电流和频率信号。In this step, a current transformer and a voltage transformer are specifically used to collect the voltage, current and frequency signals at the grid connection point of the photovoltaic power station.
步骤3、利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；
该步骤中，所述获得各个光伏发电单元的有功、无功功率参考值的过程具体包括：根据测量的电压、电流和频率信号通过虚拟同步发电机控制算法获得各个光伏单元的有功、无功功率参考值。In this step, the process of obtaining the active and reactive power reference values of each photovoltaic power generation unit specifically includes: obtaining the active and reactive power of each photovoltaic unit through a virtual synchronous generator control algorithm according to the measured voltage, current and frequency signals Reference.
下面以具体的实例对上述虚拟同步发电机控制原理进行详细说明：The following describes the control principle of the virtual synchronous generator in detail with a specific example:
如图2所示为本发明所举实例中逆变器拓扑结构及其等效的虚拟同步发电机框图，同步发电机的机械方程为Figure 2 shows the inverter topology structure and its equivalent virtual synchronous generator block diagram in the example of the present invention. The mechanical equation of the synchronous generator is:
式中，J为同步发电机的转动惯量，单位为kg·m2Tm、Te和Td分别为同步发电机的机械、电磁和阻尼转矩，单位为N·m，D为阻尼系数，单位为N·m·s/rad，ω0为电网同步角速度，单位为rad/s。其中发电机的电磁转矩Te由虚拟同步发电机电势eabc和输出电流iabc计算得到，如式(2)所示：In the formula, J is the moment of inertia of the synchronous generator, in kg m 2 T m , Te and T d are the mechanical, electromagnetic and damping torques of the synchronous generator, in N m, and D is the damping coefficient , the unit is N·m·s/rad, ω 0 is the grid synchronous angular velocity, the unit is rad/s. The electromagnetic torque Te of the generator is calculated from the virtual synchronous generator potential e abc and output current i abc , as shown in formula (2):
Te＝Pe/ω＝(eaia+ebib+ecic)/ω (2)T e =P e /ω=(e a i a +e b i b +e c i c )/ω (2)
式中，Pe为虚拟同步发电机输出的电磁功率。In the formula, P e is the electromagnetic power output by the virtual synchronous generator.
逆变器的虚拟同步发电机控制在其有功功率环中引入式(1)的控制，通过控制的手段实现了同步发电机的机械特性。由于引入了转动惯量J，使得并网逆变器在有功功率和频率动态过程中具有了惯性，引入阻尼参数D，使得逆变器具有了阻尼电网功率振荡的能力，这两个变量的引入是逆变器具有了同步发电机的性能，对于改善逆变器运行特性具有重要意义。The virtual synchronous generator control of the inverter introduces the control of formula (1) into its active power loop, and realizes the mechanical characteristics of the synchronous generator by means of control. Due to the introduction of the moment of inertia J, the grid-connected inverter has inertia in the dynamic process of active power and frequency, and the introduction of the damping parameter D makes the inverter have the ability to damp the power oscillation of the grid. The introduction of these two variables is The inverter has the performance of a synchronous generator, which is of great significance for improving the operating characteristics of the inverter.
由图2同时可以得到虚拟同步发电机的电磁方程为：From Figure 2, the electromagnetic equation of the virtual synchronous generator can be obtained as:
式中，L为同步发电机的同步电抗，R为同步发电机的同步电阻，uabc为同步发电机机端电压，iabc为同步发电机机端电流，eabc表示同步发电机电势。In the formula, L is the synchronous reactance of the synchronous generator, R is the synchronous resistance of the synchronous generator, u abc is the terminal voltage of the synchronous generator, i abc is the terminal current of the synchronous generator, and e abc is the synchronous generator potential.
由虚拟同步发电机的电磁方程能够得到虚拟同步发电机的机端电流，从而由机端电流和电压计算得到功率指令，该功率指令为虚拟同步发电机控制的各个光伏发电单元的总功率指令。The terminal current of the virtual synchronous generator can be obtained from the electromagnetic equation of the virtual synchronous generator, so that the power command can be calculated from the terminal current and voltage, and the power command is the total power command of each photovoltaic power generation unit controlled by the virtual synchronous generator.
进一步的，在虚拟同步发电机控制中可以同时实现频率控制和电压控制，如图3所示为本发明实施例中虚拟同步发电机控制器的控制框图示意图，频率控制通过测量并网点的频率，将其与系统额定频率的偏差用于调节总有功功率：Further, in the virtual synchronous generator control, frequency control and voltage control can be realized at the same time. FIG. 3 is a schematic diagram of the control block diagram of the virtual synchronous generator controller in the embodiment of the present invention. Use its deviation from the system's rated frequency to adjust the total active power:
ΔP＝Kf(fref-fmeas) (3)ΔP=K f (f ref -f meas ) (3)
式中，Kf为调频系数，fref为系统额定频率，fmeas为测量的并网点频率。In the formula, K f is the frequency modulation coefficient, f ref is the rated frequency of the system, and f meas is the measured grid-connected point frequency.
电压控制位于无功功率控制环，将电压偏差用于调节虚拟同步机的电势The voltage control is located in the reactive power control loop, and the voltage deviation is used to adjust the potential of the virtual synchronous machine
ΔE＝Kv(Vref-Vmeas) (4)ΔE=K v (V ref -V meas ) (4)
由虚拟同步发电机控制器得到有功、无功功率参考值，然后再由功率分配单元将该功率指令按照各个光伏发电单元的额定容量按比例分配下发给各个光伏发电单元，如式(5)所示The active and reactive power reference values are obtained by the virtual synchronous generator controller, and then the power distribution unit distributes the power command to each photovoltaic power generation unit proportionally according to the rated capacity of each photovoltaic power generation unit, as shown in formula (5) shown
式中，Prefi为第i个光伏单元的有功功率指令，Si为第i个光伏单元的额定容量，N为虚拟同步发电机控制的总的光伏发电单元数，PTotal为由虚拟同步发电机控制得到的总功率参考值，对于无功功率的分配方法与有功功率相同。In the formula, P refi is the active power command of the ith photovoltaic unit, S i is the rated capacity of the ith photovoltaic unit, N is the total number of photovoltaic power generation units controlled by the virtual synchronous generator, and P Total is the power generated by the virtual synchronous generator. The total power reference value obtained by the machine control, the allocation method for reactive power is the same as that for active power.
步骤4、将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元；
由于虚拟同步发电机控制器与各个光伏发电单元分布于不同的地理位置，为了保证信号传输的速度，可以采用光纤网络将功率指令下发到各个光伏发电单元。Since the virtual synchronous generator controller and each photovoltaic power generation unit are distributed in different geographical locations, in order to ensure the speed of signal transmission, an optical fiber network can be used to issue power commands to each photovoltaic power generation unit.
所述功率指令为虚拟同步发电机控制的各个光伏发电单元的功率指令。The power command is the power command of each photovoltaic power generation unit controlled by the virtual synchronous generator.
步骤5、所述各个光伏发电单元接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。Step 5: Each photovoltaic power generation unit receives a power command, tracks a power reference value, and realizes power control of the photovoltaic power station.
这里，一般光伏发电单元能够接受外部的功率指令，故实现起来比较容易，本发明实施例不涉及到对光伏发电单元内部控制系统的改造。Here, the general photovoltaic power generation unit can accept external power commands, so it is relatively easy to implement, and the embodiment of the present invention does not involve the modification of the internal control system of the photovoltaic power generation unit.
下面结合一个具体实施例对本发明的控制进行详细说明，采用Matlab/Simulink搭建如图4所示的电力系统模型对所述控制方法进行仿真验证，该电力系统包含一台同步发电机G1和一个光伏电站，光伏电站采用2个光伏逆变单元表示，容量均为30kW，同步发电机G1额定容量为300kW。The control of the present invention will be described in detail below with reference to a specific embodiment. Matlab/Simulink is used to build a power system model as shown in Figure 4 to simulate and verify the control method. The power system includes a synchronous generator G1 and a photovoltaic system. The power station, the photovoltaic power station is represented by 2 photovoltaic inverter units with a capacity of 30kW, and the rated capacity of the synchronous generator G1 is 300kW.
根据光照条件光伏电站最大输出功率为50kW，为了对光伏电站进行虚拟同步发电机控制，将其进行降载控制留有20％的备用容量(通过直接给光伏发电单元下降载功率指令实现)，控制其总输出功率为40kW，光伏发电单元1和2的输出功率相同分别为约20kW，同步发电机输出功率150kW，负载190kW。光伏电站的虚拟同步发电机控制参数为J＝4,D＝20,由于光伏单元1和光伏单元2容量相同，采用平均分配虚拟同步发电机的功率指令。为了验证光伏电站的虚拟同步发电机控制效果，在2s时给虚拟同步发电机控制器一个阶跃信号，控制其输出功率由40kW阶跃到45kW，如图5所示为本发明所举实例中光伏单元输出功率的示意图，如图6所示为本发明所举实例中光伏电站输出功率示意图。According to the light conditions, the maximum output power of the photovoltaic power station is 50kW. In order to control the virtual synchronous generator of the photovoltaic power station, 20% of the spare capacity is reserved for the load reduction control of the photovoltaic power station (which is realized by directly giving the photovoltaic power generation unit a load reduction power command). Control The total output power is 40kW, the output power of photovoltaic
仿真结果表明，通过虚拟同步发电机控制，光伏电站的输出功率具有了与同步发电机类似的惯性和阻尼特性。进一步，验证光伏电站虚拟同步发电机控制对系统频率控制的效果，频率控制器参数Kf取1000。在5s时增加负载20kW，引起系统频率下降。如图7所示为本发明所举实例中电力系统的频率对比示意图，当采用虚拟同步发电机控制和不采用虚拟同步发电机控制时(光伏发电单元不响应系统频率变化)得到的系统频率如图7中所示。The simulation results show that through the virtual synchronous generator control, the output power of the photovoltaic power station has inertia and damping characteristics similar to those of the synchronous generator. Further, to verify the effect of the virtual synchronous generator control of the photovoltaic power station on the system frequency control, the frequency controller parameter K f is set to 1000. At 5s, the load is increased by 20kW, causing the system frequency to drop. Figure 7 is a schematic diagram of the frequency comparison of the power system in the example of the present invention. When the virtual synchronous generator control is adopted and the virtual synchronous generator control is not adopted (the photovoltaic power generation unit does not respond to the system frequency change), the obtained system frequency is as follows: shown in Figure 7.
进一步的，如图8所示为本发明实施例中光伏单元的频率控制功率输出示意图，如图9所示为本发明实施例中光伏电站的频率控制功率输出示意图，由仿真结果表明：采用虚拟同步发电机控制的光伏电站能够增加有功功率的输出参与系统频率控制，有利于系统的安全稳定运行。Further, FIG. 8 is a schematic diagram of the frequency control power output of the photovoltaic unit in the embodiment of the present invention, and FIG. 9 is a schematic diagram of the frequency control power output of the photovoltaic power station in the embodiment of the present invention. The photovoltaic power station controlled by the synchronous generator can increase the output of active power to participate in the system frequency control, which is beneficial to the safe and stable operation of the system.
由上述实施例可知，本发明实施例提供的光伏电站虚拟同步发电机控制方法使光伏电站具有了虚拟同步发电机的功能，能够为系统提供惯性和阻尼，有效应对系统频率变化，提高了保障系统安全稳定运行的能力。It can be seen from the above embodiments that the control method for a virtual synchronous generator of a photovoltaic power station provided by the embodiment of the present invention enables the photovoltaic power station to have the function of a virtual synchronous generator, which can provide inertia and damping for the system, effectively cope with changes in the system frequency, and improve the security system. The ability to operate safely and stably.
针对上述方法流程，本发明实施例还提供一种光伏电站虚拟同步发电机的控制装置，该装置的具体内容可以参照上述方法实施，如图10所示为本发明实施例所提供的光伏电站虚拟同步发电机的控制装置示意图，所述装置主要包括：In view of the above method flow, the embodiment of the present invention also provides a control device for a virtual synchronous generator of a photovoltaic power station, and the specific content of the device can be implemented with reference to the above method. Schematic diagram of the control device of the synchronous generator, the device mainly includes:
降载控制模块101，用于对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；The load shedding control module 101 is used to perform load shedding control on each photovoltaic power generation unit participating in the virtual synchronous generator control in the photovoltaic power station;
测量模块102，用于采集所述光伏电站并网点处的电压、电流和频率信号；a measurement module 102, configured to collect voltage, current and frequency signals at the grid connection point of the photovoltaic power station;
虚拟同步发电机控制模块103，用于利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；The virtual synchronous generator control module 103 is used to realize the virtual synchronous generator control of the photovoltaic power station by using the virtual synchronous generator controller, and obtain the active and reactive power reference values of each photovoltaic power generation unit;
通讯模块104，用于将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元。The communication module 104 is configured to send the power command obtained by the virtual synchronous generator controller to each photovoltaic power generation unit through the optical fiber network.
另外，在光伏发电单元内部设置有功率控制模块，该功率控制模块用于接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。In addition, a power control module is arranged inside the photovoltaic power generation unit, and the power control module is used for receiving power commands, tracking the power reference value, and realizing the power control of the photovoltaic power station.
上述各功能模块的具体实现过程可参考方法实施例所述。For the specific implementation process of the above functional modules, reference may be made to the description in the method embodiments.
本领域内的技术人员应明白，本发明的实施例可提供为方法、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, or as a computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明披露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求书的保护范围为准。The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
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