CN105207616A - Low voltage ride through (LVRT) testing device for photovoltaic inverter - Google Patents
Low voltage ride through (LVRT) testing device for photovoltaic inverter Download PDFInfo
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Abstract
本发明公开了一种光伏逆变器低电压穿越测试装置，包括壳体和内置在壳体内的穿越测试单元，在壳体上设有A端口、B端口和C端口，分别与内置在壳体内的穿越测试单元连接，穿越测试装置通过A端口与被测光伏逆变器输出的三相交流侧连接，通过B端口与被测光伏逆变器直流侧连接，通过C端口与外接电网连接；穿越测试单元包括功率分析仪、三相变压器Ⅰ、交直交变流器、三相变压器Ⅱ、三相变压器Ⅲ、整流器、光伏模拟器、录波仪、电压/电流传感器Ⅰ、电压/电流传感器Ⅱ、电压/电流传感器Ⅲ、电压/电流传感器Ⅳ和触摸屏。本发明的技术方案克服了现有技术的不足，能连续准确设定跌落电压，跟踪速度快，特性硬，能耗小，并且可移动测试，满足了测试精度和长时间运行的要求。
The invention discloses a photovoltaic inverter low-voltage ride-through test device, which includes a casing and a ride-through test unit built in the casing, and an A port, a B port, and a C port are arranged on the casing, and are connected with the built-in casing respectively. The ride-through test unit is connected, the ride-through test device is connected to the three-phase AC side of the output of the photovoltaic inverter under test through the A port, connected to the DC side of the tested photovoltaic inverter through the B port, and connected to the external power grid through the C port; The test unit includes power analyzer, three-phase transformer Ⅰ, AC-DC-AC converter, three-phase transformer Ⅱ, three-phase transformer Ⅲ, rectifier, photovoltaic simulator, wave recorder, voltage/current sensor Ⅰ, voltage/current sensor Ⅱ, Voltage/current sensor III, voltage/current sensor IV and touch screen. The technical scheme of the present invention overcomes the shortcomings of the prior art, can continuously and accurately set the drop voltage, has fast tracking speed, hard characteristics, low energy consumption, and can be tested on a mobile basis, meeting the requirements of test accuracy and long-term operation.
Description
技术领域 technical field
本发明属于电力设备领域，尤其涉及一种光伏逆变器低电压穿越测试装置。 The invention belongs to the field of electric equipment, and in particular relates to a photovoltaic inverter low-voltage ride-through test device.
背景技术 Background technique
随着工农业经济的发展，各种负载的接入使配电网的环境日益复杂，时常会出现电网电压短期跌落现象。国家电网导则要求光伏并网逆变器在电网电压跌落瞬间一定范围内不能脱网运行，并对电网电压的稳定和故障穿越做出贡献。为测试光伏发电系统低电压穿越(LVRT)运行能力，需要构建光伏逆变器低电压穿越测试装置。目前已有的测试装置是采用阻抗分压的测试方法，这种测试装置存在电压跌落设置不连续、测试精度不高、容量大、发热严重、耗能高、且不能长时间运行的缺点。 With the development of the industrial and agricultural economy, the access of various loads makes the environment of the distribution network increasingly complex, and the short-term drop of the grid voltage often occurs. The national grid guidelines require that photovoltaic grid-connected inverters cannot operate off-grid within a certain range at the moment of grid voltage drop, and contribute to grid voltage stability and fault ride-through. In order to test the low voltage ride through (LVRT) operation capability of the photovoltaic power generation system, it is necessary to construct a photovoltaic inverter low voltage ride through test device. At present, the existing test device adopts the test method of impedance division. This test device has the disadvantages of discontinuous voltage drop setting, low test accuracy, large capacity, serious heat generation, high energy consumption, and inability to run for a long time.
发明内容 Contents of the invention
本发明的目的在于提供一种光伏逆变器低电压穿越测试装置，该穿越测试装置克服了现有技术的不足，能连续准确设定跌落电压，跟踪速度快，特性硬，能耗小，并且可移动测试，满足了测试精度和长时间运行的要求。 The object of the present invention is to provide a photovoltaic inverter low-voltage ride-through test device, which overcomes the shortcomings of the prior art, can continuously and accurately set the drop voltage, has fast tracking speed, hard characteristics, low energy consumption, and The mobile test meets the requirements of test accuracy and long-running time.
为达到上述目的，本发明的技术方案如下：一种光伏逆变器低电压穿越测试装置，包括壳体和穿越测试单元，其特征在于：所述穿越测试单元内置在壳体内，在壳体上设有A端口、B端口和C端口，分别与内置在壳体内的穿越测试单元连接，所述穿越测试装置通过A端口与被测光伏逆变器输出的三相交流侧连接，通过B端口与被测光伏逆变器直流侧连接，通过C端口与外接电网连接；所述穿越测试单元包括： In order to achieve the above object, the technical solution of the present invention is as follows: a photovoltaic inverter low-voltage ride-through test device, including a casing and a ride-through test unit, characterized in that: the ride-through test unit is built in the casing, and on the casing There are A port, B port and C port, which are respectively connected to the ride-through test unit built in the casing. The ride-through test device is connected to the three-phase AC side output by the photovoltaic inverter under test through the A port, and connected to the three-phase AC side through the B port. The photovoltaic inverter under test is connected to the DC side and connected to the external power grid through the C port; the ride-through test unit includes:
功率分析仪；所述功率分析仪通过连接在A端口的电压/电流传感器Ⅲ来检测Ａ端口的功率变化； A power analyzer; the power analyzer detects the power change of the A port through the voltage/current sensor III connected to the A port;
三相变压器Ⅰ；所述三相变压器Ⅰ的输入端与A端口连接，其输出端与交直交变流器连接，用来起隔离作用； Three-phase transformer I; the input end of the three-phase transformer I is connected to the A port, and its output end is connected to the AC-DC-AC converter for isolation;
交直交变流器；所述交直交变流器的一端与三相变压器Ⅰ的输出端连接，另一端与三相变压器Ⅱ的输入端连接，用来提供跌落电压； AC-DC-AC converter; one end of the AC-DC-AC converter is connected to the output end of the three-phase transformer I, and the other end is connected to the input end of the three-phase transformer II to provide a drop voltage;
三相变压器Ⅱ；所述三相变压器Ⅱ的输入端和输出端分别与交直交变流器和外接电网的C端口相连，用来转换电网与变流器之间的电压差异，同时具有滤波的作用； Three-phase transformer II; the input and output ends of the three-phase transformer II are respectively connected to the AC-DC converter and the C port of the external power grid, which are used to convert the voltage difference between the power grid and the converter, and at the same time have the function of filtering effect;
三相变压器Ⅲ；所述三相变压器Ⅲ的输入端与外接电网的C端口连接，输出端与整流器连接，起隔离作用； Three-phase transformer III; the input end of the three-phase transformer III is connected to the C port of the external power grid, and the output end is connected to the rectifier for isolation;
整流器；所述整流器的输入端与三相变压器Ⅲ的输出端连接，整流器的输出端与光伏模拟器的一端连接，通过整流形成直流电压提供给光伏模拟器； A rectifier; the input end of the rectifier is connected to the output end of the three-phase transformer III, the output end of the rectifier is connected to one end of the photovoltaic simulator, and a DC voltage is formed through rectification and provided to the photovoltaic simulator;
光伏模拟器；所述光伏模拟器连接在整流器和B端口之间，用来模拟光伏阵列运行特性； A photovoltaic simulator; the photovoltaic simulator is connected between the rectifier and the B port, and is used to simulate the operating characteristics of the photovoltaic array;
录波仪；所述录波仪分别通过设置在Ｂ端口上的电压/电流传感器Ⅰ、设置在Ａ端口上电压/电流传感器Ⅱ和设置在三相变压器Ⅰ与交直交变流器之间的电压/电流传感器Ⅳ来检测Ｂ端口、Ａ端口和三相变压器Ⅰ输出端的电压和电流的变化，来记录各检测点的电压和电流波形。 The wave recorder; the wave recorder passes through the voltage/current sensor I set on the B port, the voltage/current sensor II set on the A port, and the voltage between the three-phase transformer I and the AC-DC-AC converter. /Current sensor IV to detect the voltage and current changes of B port, A port and three-phase transformer I output terminal, to record the voltage and current waveforms of each detection point.
以及触摸屏；所述触摸屏通过以太网接口与交直交变流器连接，通过触摸屏界面设定交直交变流器控制参数，实验时设定电压跌落故障类型。 and a touch screen; the touch screen is connected to the AC-DC-AC converter through the Ethernet interface, the control parameters of the AC-DC-AC converter are set through the touch screen interface, and the voltage drop fault type is set during the experiment.
在上述技术方案中，本发明的一种光伏逆变器低电压穿越测试装置通过三相变压器Ⅲ从外接电网取电，经过整流器整流后接入光伏模拟器（IV模拟器），光伏模拟器模拟光伏电站运行特性。被测光伏并网逆变器的直流侧与光伏模拟器连接，被测光伏并网逆变器的交流侧通过三相变压器Ⅰ接入交直交变流器，触摸屏通过以太网接口与交直交变流器连接，电网侧的三相变压器Ⅲ用来转换电网与变流器之间的电压差异，同时具有滤波的作用，避免交直交变流器对电网注入谐波，在进行低电压穿越检测时，通过触摸屏界面设定交直交变流器控制参数，设定电压跌落故障类型，交直交变流器中的网侧变流器工作在逆变模式，交直交变流器中的故障生成侧变流器工作在整流模式，能量从光伏电站端流向电网。本发明有以下有益效果：第一，可以连续准确设定跌落电压；第二，跟踪速度快，特性硬，能耗小，可移动测试；第三，满足了测试精度和长时间运行的要求。 In the above technical solution, a photovoltaic inverter low-voltage ride-through test device of the present invention takes power from an external power grid through a three-phase transformer III, and connects to a photovoltaic simulator (IV simulator) after being rectified by a rectifier, and the photovoltaic simulator simulates Operating characteristics of photovoltaic power plants. The DC side of the photovoltaic grid-connected inverter under test is connected to the photovoltaic simulator, the AC side of the photovoltaic grid-connected inverter under test is connected to the AC-DC converter through the three-phase transformer Ⅰ, and the touch screen is connected to the AC-DC converter through the Ethernet interface. The three-phase transformer III on the grid side is used to convert the voltage difference between the grid and the converter, and at the same time has the function of filtering to prevent the AC-DC converter from injecting harmonics into the grid. When performing low-voltage ride-through detection , set the AC-DC-AC converter control parameters through the touch screen interface, set the voltage drop fault type, the grid-side converter in the AC-DC-AC converter works in the inverter mode, and the fault generation side transformer The rectifier works in the rectification mode, and the energy flows from the photovoltaic power station to the grid. The invention has the following beneficial effects: first, the drop voltage can be continuously and accurately set; second, the tracking speed is fast, the characteristics are hard, the energy consumption is small, and the test can be carried out; third, the test accuracy and long-term operation requirements are met.
附图说明 Description of drawings
图1为本发明一种光伏逆变器低电压穿越测试装置的结构框图。 Fig. 1 is a structural block diagram of a photovoltaic inverter low voltage ride through test device according to the present invention.
具体实施方式 Detailed ways
下面结合附图，对本发明实施例中的技术方案进行清晰、完整地阐述，所述的实施例仅为本发明的一部分实施例，非全部的实施例。基于本发明中的实施例，本领域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，都属于本发明保护的范围。 The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings, and the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
由图1可见，本实施例的一种光伏逆变器低电压穿越测试装置，包括壳体1和穿越测试单元，该穿越测试单元内置在壳体1内，在壳体1上设有A端口、B端口和C端口，分别与内置在壳体1内的穿越测试单元连接，本实施例的穿越测试装置通过A端口与被测光伏逆变器输出的三相交流侧连接，通过B端口与被测光伏逆变器直流侧连接，通过C端口与外接电网连接。本实施例的穿越测试单元是由功率分析仪2、三相变压器Ⅰ3、交直交变流器4、三相变压器Ⅱ5、三相变压器Ⅲ6、整流器7、光伏模拟器8、录波仪9、电压/电流传感器Ⅰ10、电压/电流传感器Ⅱ11、电压/电流传感器Ⅲ12、电压/电流传感器Ⅳ13和触摸屏14组成。本实施例中，功率分析仪2通过连接在A端口的电压/电流传感器Ⅲ12来检测Ａ端口的功率变化；三相变压器Ⅰ3的输入端与A端口连接，其输出端与交直交变流器4连接，用来起隔离作用；交直交变流器4的一端与三相变压器Ⅰ3的输出端连接，另一端与三相变压器Ⅱ5的输入端连接，用来提供跌落电压；本实施例的触摸屏14是威纶通TK8070iH型触摸屏，通过以太网接口与交直交变流器连接，通过触摸屏界面设定交直交变流器控制参数，实验时设定电压跌落故障类型，包括对称电压跌落故障和不对称电压跌落故障，以及电压跌落的幅度；三相变压器Ⅱ5的输入端和输出端分别与交直交变流器4和外接电网的C端口相连，用来转换电网与变流器之间的电压差异，同时具有滤波的作用；三相变压器Ⅲ6的输入端与外接电网的C端口连接，输出端与整流器7连接，起隔离作用；整流器7的输入端与三相变压器Ⅲ6的输出端连接，整流器7的输出端与光伏模拟器8的一端连接，通过整流形成直流电压提供给光伏模拟器8；光伏模拟器8连接在整流器7和B端口之间，用来模拟光伏阵列运行特性；录波仪９分别通过设置在Ｂ端口上的电压/电流传感器Ⅰ10、设置在Ａ端口上电压/电流传感器Ⅱ11和设置在三相变压器Ⅰ3与交直交变流器4之间的电压/电流传感器Ⅳ13来检测Ｂ端口、Ａ端口和三相变压器Ⅰ3输出端的电压和电流的变化，来记录各检测点的电压和电流波形。 It can be seen from Fig. 1 that a photovoltaic inverter low-voltage ride-through test device in this embodiment includes a housing 1 and a ride-through test unit, the ride-through test unit is built in the housing 1, and an A port is provided on the housing 1 , B port and C port are respectively connected to the ride-through test unit built in the housing 1, the ride-through test device of this embodiment is connected to the three-phase AC side output by the photovoltaic inverter under test through the A port, and connected to the three-phase AC side through the B port. The photovoltaic inverter under test is connected to the DC side and connected to the external power grid through the C port. The ride-through test unit of this embodiment is composed of a power analyzer 2, a three-phase transformer I3, an AC/DC converter 4, a three-phase transformer II5, a three-phase transformer III6, a rectifier 7, a photovoltaic simulator 8, a wave recorder 9, a voltage /current sensor I10, voltage/current sensor II11, voltage/current sensor III12, voltage/current sensor IV13 and touch screen 14. In this embodiment, the power analyzer 2 detects the power change of the A port through the voltage/current sensor III12 connected to the A port; the input end of the three-phase transformer I3 is connected to the A port, and its output end is connected to the AC-DC-AC converter 4 connection, used for isolation; one end of the AC-DC-AC converter 4 is connected to the output end of the three-phase transformer I3, and the other end is connected to the input end of the three-phase transformer II5 to provide a drop voltage; the touch screen 14 of this embodiment It is Weiluntong TK8070iH touch screen, connected to the AC-DC-AC converter through the Ethernet interface, setting the control parameters of the AC-DC-AC converter through the touch screen interface, and setting the voltage drop fault type during the experiment, including symmetrical voltage drop fault and asymmetrical voltage drop fault Voltage drop fault, and the magnitude of the voltage drop; the input and output ends of the three-phase transformer II 5 are respectively connected to the AC-DC converter 4 and the C port of the external power grid to convert the voltage difference between the power grid and the converter, At the same time, it has the function of filtering; the input end of the three-phase transformer III6 is connected to the C port of the external power grid, and the output end is connected to the rectifier 7 for isolation; the input end of the rectifier 7 is connected to the output end of the three-phase transformer III6, and the rectifier 7 The output end is connected to one end of the photovoltaic simulator 8, and the DC voltage is formed by rectification and supplied to the photovoltaic simulator 8; the photovoltaic simulator 8 is connected between the rectifier 7 and the B port to simulate the operating characteristics of the photovoltaic array; the wave recorder 9 is respectively The B port, The changes of the voltage and current at the A port and the output terminal of the three-phase transformer I3 are used to record the voltage and current waveforms at each detection point.
本实施例的低电压穿越测试装置在测试时，被测光伏逆变器直流侧连接在B端口，被测光伏逆变器输出的三相交流侧连接在A端口，测试装置的C端口连接到电网。通过三相变压器Ⅲ6通过C端口从外接电网取电，经过整流器7整流后接入光伏模拟器8（IV模拟器），光伏模拟器8模拟光伏电站运行特性。被测光伏并网逆变器的直流侧通过B端口与光伏模拟器8连接，被测光伏并网逆变器的交流侧通过A端口和三相变压器Ⅰ3接入交直交变流器4，电网侧通过C端口的三相变压器Ⅲ6用来转换电网与变流器之间的电压差异，同时具有滤波的作用，避免交直交变流器对电网注入谐波，本实施例中的交直交变流器是由故障生成侧变流器和网侧变流器组成，其主电路是由两个背靠背三相两电平电压型PWM变流器组成，两个变流器直流侧通过直流电容器并联，同时触摸屏14通过以太网接口与交直交变流器连接。在进行低电压穿越检测时，通过触摸屏14界面设定交直交变流器控制参数，设定电压跌落故障类型，包括对称电压跌落故障和不对称电压跌落故障，以及电压跌落的幅度；交直交变流器4中的网侧变流器工作在逆变模式，交直交变流器4中的故障生成侧变流器工作在整流模式，能量从光伏电站端流向电网。本实施例可以连续准确设定跌落电压、跟踪速度快、特性硬、可移动测试。 During the test of the low voltage ride through test device of this embodiment, the DC side of the photovoltaic inverter under test is connected to the B port, the three-phase AC side output by the photovoltaic inverter under test is connected to the A port, and the C port of the test device is connected to the power grid. The three-phase transformer III6 takes power from the external power grid through the C port, and after being rectified by the rectifier 7, it is connected to the photovoltaic simulator 8 (IV simulator), and the photovoltaic simulator 8 simulates the operating characteristics of the photovoltaic power station. The DC side of the photovoltaic grid-connected inverter under test is connected to the photovoltaic simulator 8 through the B port, and the AC side of the photovoltaic grid-connected inverter under test is connected to the AC-DC-AC converter 4 through the A port and the three-phase transformer I3. The three-phase transformer Ⅲ6 through the C port is used to convert the voltage difference between the grid and the converter, and at the same time has the function of filtering to prevent the AC-DC converter from injecting harmonics into the grid. The AC-DC converter in this embodiment The converter is composed of a fault generating side converter and a grid side converter. Its main circuit is composed of two back-to-back three-phase two-level voltage PWM converters. The DC sides of the two converters are connected in parallel through a DC capacitor. At the same time, the touch screen 14 is connected with the AC-DC-AC converter through the Ethernet interface. When performing low-voltage ride-through detection, set the AC-DC-AC converter control parameters through the touch screen 14 interface, and set the voltage drop fault type, including symmetrical voltage drop faults and asymmetric voltage drop faults, and the magnitude of voltage drop; The grid-side converter in the converter 4 works in the inverter mode, and the fault-generating side converter in the AC-DC-AC converter 4 works in the rectification mode, and the energy flows from the photovoltaic power station to the grid. In this embodiment, the drop voltage can be continuously and accurately set, the tracking speed is fast, the characteristics are hard, and the test can be carried out.
以上所述，仅是本发明的实施例，并非对本发明作任何限制，凡是根据本发明技术实质对以上实施例所作的任何简单修改、变更以及等效方法的变化，均仍属于本发明技术方案的保护范围内。 The above description is only an embodiment of the present invention, and does not limit the present invention in any way. All simple modifications, changes and equivalent method changes made to the above embodiments according to the technical essence of the present invention still belong to the technical solution of the present invention. within the scope of protection.
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