WO2019119947A1 - 一种用于分布式电源的孤岛保护装置及其检测算法 - Google Patents

一种用于分布式电源的孤岛保护装置及其检测算法 Download PDF

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WO2019119947A1
WO2019119947A1 PCT/CN2018/110585 CN2018110585W WO2019119947A1 WO 2019119947 A1 WO2019119947 A1 WO 2019119947A1 CN 2018110585 W CN2018110585 W CN 2018110585W WO 2019119947 A1 WO2019119947 A1 WO 2019119947A1
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distributed power
thyristor
voltage
protection device
island
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French (fr)
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肖华锋
王政
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Southeast University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H02J3/388—Arrangements for the handling of islanding, e.g. for disconnection or for avoiding the disconnection of power
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H02J3/381—Dispersed generators

Definitions

  • the invention relates to an island protection device technology for distributed power sources, and belongs to the technical field of distributed power generation protection.
  • Distributed power sources such as photovoltaic power plants, wind farms, micro-turbine power generation, etc.
  • the distributed power supply running on the island will endanger the safety of the grid inspectors, the powered load equipment and the distributed power source.
  • the international and domestic grid-connected standards require that the distributed power supply operated by the island must reliably detect the island state within a limited time and safely Detach from the grid at the public connection point.
  • the island protection schemes for distributed power sources are generally classified into active type, passive type, and communication type.
  • the active perturbation island detection algorithm is generally used to access the distributed power supply of the low-voltage distribution network, and the active disturbance is realized based on the grid-connected inverter.
  • the passive island detection method is generally simple and easy to implement, but there is a large non- Detection area; communication island detection method is widely used to access the distributed power system of medium and high voltage power grid, but this method needs to build communication lines connecting upstream substation and distributed power supply, for most distributed power sources built in remote areas. It is said that there are problems in construction cost and maintenance difficulties.
  • the island detection method based on the dedicated communication line cannot effectively identify the disconnection between the upstream substation and the distributed power source.
  • the existing reference literature proposes that the island detection method based on power line carrier communication can detect the disconnection of the transmission line, but there is a problem that the detection signal transmitted by the substation side is greatly attenuated and interfered on the receiving side of the distributed power source, causing misoperation and The rejection rate increased.
  • a distributed island protection device can be invented, its equipment property can be independent of the distributed power supplier, and the most important is to avoid the above technical and cost defects, which will greatly improve the safety, low operating cost and low maintenance cost of the distributed power supply. .
  • the invention is used for solving the island protection when the distributed power source is connected to the medium and high voltage power grid, so as to solve the problems of long construction period, high cost and low reliability of the existing island protection based on the communication method.
  • An island protection device for distributed power supply comprising a step-down transformer (1), a current limiting reactance (2), a thyristor (3) and a controller unit (4); a primary secondary winding of the step-down transformer (1) It can be any combination of triangle or star connection; the current limiting reactance (2) can be independent inductance or the leakage inductance of the step-down transformer (1); the thyristor (3) is a commercial switching device, which can be a single The device may also be obtained by a series and parallel combination of a plurality of devices; the controller unit (4) includes a voltage, a current detecting portion, a detection algorithm operating unit, a thyristor driving signal generating portion, and a protection signal generating portion.
  • the high voltage side X of the step-down transformer is connected downstream of the distributed power feed line circuit breaker, and the low voltage side is connected to one end of the current limiting reactance.
  • the other end of the current limiting reactance is connected to the anode of the thyristor, the cathode of the thyristor is returned to the low voltage side of the step-down transformer, and the gate of the thyristor is connected to the firing angle signal end of the controller.
  • controller connects the X point voltage measurement signal and the T point current measurement signal.
  • protection signal end of the controller is connected to the circuit breaker to perform an island protection trip operation.
  • a detection algorithm for an island protection device for distributed power sources is as follows:
  • the first step is to calculate the time domain indicator
  • I peak_Bef. is the peak value of the thyristor current in the connected state
  • I peak_Aft. is the peak value of the thyristor current in the isolated state
  • the island detection criterion is satisfied When the island occurs.
  • the initialization defines the preset voltage loss k, the minimum firing angle ⁇ nmin and the maximum firing angle ⁇ nmax, and then calculates the initial trigger based on the short circuit capacity of the access point and the preset voltage loss k according to the difference of the island protection device across the line voltage or the phase voltage.
  • the invention integrates a step-down transformer, a current limiting inductor and a thyristor into a controllable short circuit at a common access point of the distributed power source, and accesses the power grid when the grid voltage crosses zero. Therefore, different short circuit current levels and grid voltage harmonic levels are generated by the common connection point in the networked and off-network state.
  • the present invention can reliably determine whether or not an island occurs based on the time domain and frequency domain indicators.
  • the invention realizes the local excitation local detection of the island detection, which greatly reduces the system cost and improves the reliability of the detection.
  • FIG. 1 is a schematic diagram of a circuit connection manner of an island protection device of the present invention when used in a single distributed power supply scenario
  • FIG. 2 is a schematic diagram showing key operation waveforms and control timings of the island protection circuit of the present invention
  • FIG. 3 is a key operational waveform diagram of the present invention before and after an island is connected to a phase voltage channel in a single distributed power supply scenario;
  • FIG. 4 is a key operational waveform diagram of the present invention before and after an island is connected to a line voltage channel in a single distributed power supply scenario;
  • FIG. 5 is a schematic diagram showing a circuit connection manner of the present invention for a single feeder multiple distributed power supply scenario
  • FIG. 6 is a key operation waveform diagram of the present invention before and after an island is connected to a phase voltage channel in the scenario of the single-feeder multi-distributed power supply embodiment 2;
  • FIG. 7 is a key operation waveform diagram of the present invention before and after an island is connected to a phase voltage channel in the scenario of the single-feeder multi-distributed power supply embodiment 2;
  • FIG. 8 is a diagram showing voltage waveforms and low-order harmonic distributions of the common connection point before the islanding device 2 is connected to the phase voltage channel in the scenario of the single-feeder multi-distributed power supply embodiment 2;
  • FIG. 9 is a voltage waveform and a low-order harmonic distribution diagram of a common connection point after the islanding device 2 is connected to the phase voltage channel in the scenario of the single-feeder multi-distributed power supply embodiment 2;
  • Figure 10 is a flow chart showing the optimization of the online firing angle of the present invention.
  • the island protection device of the present invention by installing the island protection device of the present invention at a common point of the distributed power source, the grid voltage zero-crossing point is detected in real time and the thyristor firing angle is optimized in real time, and periodically, intermittently and rotated.
  • the short circuit is triggered to obtain the time domain and frequency domain detection indicators, and the island state identification is performed by the island discrimination criterion.
  • the high voltage side X of the step-down transformer is connected downstream of the distributed power feed line circuit breaker, and the low voltage side is connected to one end of the current limiting reactance;
  • the other end of the current limiting reactance is connected to the anode of the thyristor, the cathode of the thyristor is returned to the low voltage side neutral point of the step-down transformer, and the gate end of the thyristor is connected to the triggering angle signal end of the controller;
  • the controller is connected with the X point voltage measurement signal and the T point current. The signal is measured; the protection signal terminal of the controller is connected to the circuit breaker to perform an island protection trip operation.
  • FIG. 2 is a diagram showing key operation waveforms and control timings of the island protection circuit of Embodiment 1 of the present invention.
  • Islanding protection device controller before the zero crossing angle ⁇ trigger voltage of the thyristor forms a short circuit in the grid current-limiting inductor, so that the inductor current ramp to zero when the grid voltage peak I peak, followed by rapid decline until the inductor current is at a voltage is applied to the grid Zero, the entire detection action is completed. It can be seen from the voltage waveform of the detection point X that the detection action causes a partial loss of the voltage of the common connection point.
  • FIG. 3 is a diagram showing key operation waveforms before and after an islanding device is connected to a phase voltage channel in the scenario of the first embodiment of the present invention
  • FIG. 4 is a front and rear of an islanding device connected to a line voltage channel in the scenario of Embodiment 1 of the present invention
  • Key work waveforms In the two connection modes, the peak value of the short-circuit current shows a significant difference before and after the island. The island state can be discerned only by the time domain index ⁇ I peak .
  • FIG. 5 illustrates a circuit connection manner for a single feeder multiple distributed power supply scenario according to Embodiment 2 of the present invention.
  • the island protection device 1 of the present invention is connected to the access line open circuit. Between the distributed power source 1 and the distributed power source 1 is connected between the access line circuit breaker and the distributed power source 2.
  • FIG. 6 is a key operation waveform diagram of the island protection device 1 before and after an island crossing the phase voltage channel in the scenario of the second embodiment of the present invention
  • FIG. 7 is an island when the island protection device is connected to the phase voltage channel in the scenario of the second embodiment of the present invention
  • Key work waveforms before and after After the island is generated, the peak value of the short-circuit current of the island protection device 1 is reduced, but the peak value of the short-circuit current of the island protection device 2 is not significantly reduced. After the distributed power source 1 is disconnected, the short-circuit current of the island protection device 2 changes significantly. Therefore, the single time domain index ⁇ I peak has a delay in determining the island state in a multi-distributed power supply scenario.
  • FIG. 8 is a diagram showing a voltage waveform and a low-order harmonic distribution of a common connection point before an island is connected to a phase voltage channel in the scenario of Embodiment 2 of the present invention
  • FIG. 9 is an island protection device 2 in the scenario of Embodiment 2 of the present invention
  • the frequency domain index ⁇ THD before and after the island indicates the occurrence of the island state. Therefore, the time domain frequency domain combination index is a timely, efficient and prepared island identification method in the multi-distributed power supply scenario.

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  • Power Engineering (AREA)
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Abstract

一种用于分布式电源的孤岛保护装置及其检测算法，孤岛保护装置包括降压变压器（1）、限流电抗（2）、晶闸管（3）和控制器单元（4）。通过在电网电压过零附近的一定区间内触发晶闸管（3）导通，制造一个受控的短路电流和电网电压畸变；检测算法包括晶闸管（3）触发角在线优化算法和孤岛判别准则算法，基于电网支持与脱离时分布式电源接入点的短路容量的明显差异，可以可靠识别出分布式电源是否处于孤岛运行。该孤岛保护装置是一种可分布式安装的设备，不依赖任何通讯媒介，成本低、无信号衰减和干扰问题。

Description

一种用于分布式电源的孤岛保护装置及其检测算法 技术领域
本发明涉及一种用于分布式电源的孤岛保护装置技术，属于分布式发电保护技术领域。
背景技术
分布式发电源，如光伏电站、风力发电场、微型涡轮发电等，大量接入中高压电网，但传输线路存在与大电网变电站断开的风险，从而有可能形成分布式电源的孤岛运行。孤岛运行的分布式电源将危及电网检测人员、被供电负载设备和分布式电源本身的安全，国际、国内并网标准要求孤岛运行的分布式电源必须在限定时间内可靠检测出孤岛状态并安全地在公共连接点与电网脱离。
分布式电源的孤岛保护方案一般分为主动型、被动型和通讯型等。其中主动扰动型孤岛检测算法一般用于接入低压配电网的分布式电源，并基于并网逆变器实现主动扰动；被动型孤岛检测方法一般比较简单，容易实现，但存在较大的非检测区；通讯型孤岛检测方法被普遍用于接入中高压电网的分布式电源系统，但该方法需要建设连接上游变电站和分布式电源的通讯线路，对大多数建立在偏远地区分布式电源来说存在建设成本高和维护困难的难题。另外，基于专用通讯线的孤岛检测方法不能有效识别上游变电站与分布式电源之间线路断开的情景。已有参考文献提出基于电力线载波通讯的孤岛检测方法可以检测输电线路断开的情景，但存在变电站侧所发送检测信号在分布式电源的接收侧存在大幅衰减和受干扰的难题，使误动和拒动率升高。
若能发明一种分布式孤岛保护装置，其设备产权能独立于分布式电源商，最重要的是避免上述技术和成本缺陷，将大幅提高分布式电源的安全、低运行成本和低维护成本运行。
发明内容
技术问题：本发明用于解决分布式电源接入中高压电网时的孤岛保护，以解决目前基于通讯方式实现孤岛保护存在的建设周期长、成本高、可靠性低等难题。
技术方案：本发明采用以下技术方案：
一种用于分布式电源的孤岛保护装置，包括降压变压器(1)、限流电抗(2)、晶闸管(3)和控制器单元(4)；降压变压器(1)的原副边绕组可以为三角形或星形连接的任意组合；限流电抗(2)可以为独立的电感，也可以为降压变压器(1)的漏感来实现；晶闸管(3)为商用开关器件，可为单一器件，也可由多个器件串并联组合得到；控制器单元(4)包括电压、电流检测部分、检测算法运行单元、晶闸管驱动信号产生部分和保护信号产生部分。
进一步地，所述降压变压器的高压侧X连接于分布式电源馈入线路断路器的下游，低压侧连接限流电抗的一端。
进一步地，所述限流电抗的另一端连接晶闸管的阳极、晶闸管的阴极返回降压变压器的低压侧、晶闸管的门极连接控制器的触发角信号端。
进一步地，所述控制器连接X点电压测量信号和T点电流测量信号。
进一步地，所述控制器的保护信号端连接至电路断路器，以便执行孤岛保护跳闸操作。
一种用于分布式电源的孤岛保护装置的检测算法，具体过程如下：
第一步计算时域指标
Figure PCTCN2018110585-appb-000001
其中I peak_Bef.是连网状态下的晶闸管电流峰值、I peak_Aft.是孤岛状态下的晶闸管电流峰值；
第二部计算频域指标ΔTHD＝THD Aft.-THD Bef.，其中THD Bef.是连网状态下的公共连接点电压总谐波含量(THD)值、THD Aft.是孤岛状态下的公共连接点电压THD值；
孤岛检测判别准则为满足
Figure PCTCN2018110585-appb-000002
时，孤岛发生。
进一步地，晶闸管触发角的在线优化流程具体过程如下：
初始化定义预设电压损失k、最小触发角δnmin和最大触发角δnmax，然后根据孤岛保护装置跨接于线电压或相电压的不同，基于接入点的短路容量和预设电压损失k计算初始触发角δn；
对于相电压形式连接：
Figure PCTCN2018110585-appb-000003
对于线电压形式连接：
Figure PCTCN2018110585-appb-000004
检查初始触发角δn是否在预设范围内，若否则进行限幅；
检查晶闸管电流应力，并调整触发角；
计算公共连接点的电压损失百分比，并调整触发角；
计算公共连接点的电压谐波含量，并调整触发角；
输出当前电网状态下的实时优化触发角。
有益效果：本发明与现有技术相比：
本发明通过在分布式电源的公共接入点并入降压变压器、限流电感和晶闸管组成的可控短路电路，在电网电压过零时接入电网。从而借助公共连接点在连网和脱网状态下短路容量的不同将产生不同的短路电流大小和电网电压谐波水平，本发明基于时域和频域指标可可靠 判定孤岛是否发生。本发明实现了孤岛检测的本地激励本地检测，大幅降低了系统成本和提高了检测的可靠性。
附图说明
图1是用于单一分布式电源情景时本发明孤岛保护装置的电路连接方式示意图；
图2是本发明孤岛保护电路关键工作波形和控制时序示意图；
图3是本发明在单一分布式电源情景下孤岛保护装置跨接于相电压通道时孤岛前后的关键工作波形图；
图4是本发明在单一分布式电源情景下孤岛保护装置跨接于线电压通道时孤岛前后的关键工作波形图；
图5描述了本发明用于单馈线多分布式电源情景的电路连接方式示意图；
图6是本发明在单馈线多分布式电源实施例2情景下孤岛保护装置1跨接于相电压通道时孤岛前后的关键工作波形图；
图7是本发明在单馈线多分布式电源实施例2情景下孤岛保护装置跨接于相电压通道时孤岛前后的关键工作波形图；
图8是本发明在单馈线多分布式电源实施例2情景下孤岛保护装置2跨接于相电压通道时孤岛前公共连接点电压波形和低次谐波分布图；
图9是本发明在单馈线多分布式电源实施例2情景下孤岛保护装置2跨接于相电压通道时孤岛后公共连接点电压波形和低次谐波分布图；
图10是本发明的在线触发角优化流程图。
具体实施方式
如图1所示，通过在分布式电源的公共点接入出安装本发明的孤岛保护装置，通过实时检测电网电压过零点和实时在线优化晶闸管触发角，并周期性地、间断性地和轮转地触发短路回路来获得时域和频域检测指标，并通过孤岛判别准则进行孤岛状态识别。
实施例1：
图1描述了本发明实施例1用于单一分布式电源情景的电路连接方式，降压变压器的高压侧X连接于分布式电源馈入线路断路器的下游，低压侧连接限流电抗的一端；限流电抗的另一端连接晶闸管的阳极、晶闸管的阴极返回降压变压器的低压侧中性点、晶闸管的门极连接控制器的触发角信号端；控制器连接X点电压测量信号和T点电流测量信号；控制器的保护信号端连接电路断路器执行孤岛保护跳闸操作。
图2是本发明实施例1的孤岛保护电路关键工作波形和控制时序。孤岛保护装置控制器 在电网电压过零点前δ角度触发晶闸管形成对限流电感的短路，使得电感电流快速上升至电网电压零点时达到峰值I peak，随后电感电流在电网电压作用下快速下降直至为零，整个检测动作完成。从检测点X电压波形可以看出，检测动作引起了公共连接点电压的部分损失。
图3是本发明实施例1情景下孤岛保护装置跨接于相电压通道时孤岛前后的关键工作波形图；图4是本发明实施例1情景下孤岛保护装置跨接于线电压通道时孤岛前后的关键工作波形图。两种连接方式下，短路电流峰值在孤岛前后表现出了明显的差异，仅依靠时域指标ΔI peak就可以辨别出孤岛状态。
实施例2：
图5描述了本发明实施例2用于单馈线多分布式电源情景的电路连接方式，在线路M1的节点②分布式电源1接入，本发明的孤岛保护装置1并接于接入线路断路器和分布式电源1之间；孤岛保护装置2并接于接入线路断路器和分布式电源2之间。
图6是本发明实施例2情景下孤岛保护装置1跨接于相电压通道时孤岛前后的关键工作波形图；图7是本发明实施例2情景下孤岛保护装置跨接于相电压通道时孤岛前后的关键工作波形图。孤岛发生后，孤岛保护装置1的短路电流峰值有降低，但孤岛保护装置2的短路电流峰值降低不明显，直到分布式电源1脱开后，孤岛保护装置2的短路电流发生了明显变化。因此，单时域指标ΔI peak判别多分布式电源场景下的孤岛状态存在延时。
图8是本发明实施例2情景下孤岛保护装置2跨接于相电压通道时孤岛前公共连接点电压波形和低次谐波分布图；图9是本发明实施例2情景下孤岛保护装置2跨接于相电压通道时孤岛后公共连接点电压波形和低次谐波分布图。孤岛前后频域指标ΔTHD明确指示孤岛状态的发生，因此，基于时域频域组合指标在多分布式电源场景是一种及时、高效、准备的孤岛判别方法。
以上详细描述了本发明的两种实施方式，但是，本发明并不限于上述实施方式中的具体细节，在本发明的技术构思范围内，可以对本发明的技术方案进行多种等同变换，这些等同变换均属于本发明的保护范围。
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合。为了避免不必要的重复，本发明对各种可能的组合方式不再另行说明。此外，本发明的各种不同的实施方式之间也可以进行任意组合，只要其不违背本发明的思想，其同样应当视为本发明所公开的内容。

Claims (7)

  1. 一种用于分布式电源的孤岛保护装置，其特征在于：包括降压变压器(1)、限流电抗(2)、晶闸管(3)和控制器单元(4)；降压变压器(1)的原副边绕组可以为三角形或星形连接的任意组合；限流电抗(2)可以为独立的电感，也可以为降压变压器(1)的漏感来实现；晶闸管(3)为商用开关器件，可为单一器件，也可由多个器件串并联组合得到；控制器单元(4)包括电压、电流检测部分、检测算法运行单元、晶闸管驱动信号产生部分和保护信号产生部分。
  2. 根据权利要求1所述的用于分布式电源的孤岛保护装置，其特征在于：所述降压变压器的高压侧X连接于分布式电源馈入线路断路器的下游，低压侧连接限流电抗的一端。
  3. 根据权利要求1所述的用于分布式电源的孤岛保护装置，其特征在于：所述限流电抗的另一端连接晶闸管的阳极、晶闸管的阴极返回降压变压器的低压侧、晶闸管的门极连接控制器的触发角信号端。
  4. 根据权利要求1所述的用于分布式电源的孤岛保护装置，其特征在于：所述控制器连接X点电压测量信号和T点电流测量信号。
  5. 根据权利要求1所述的用于分布式电源的孤岛保护装置，其特征在于：所述控制器的保护信号端连接至电路断路器，以便执行孤岛保护跳闸操作。
  6. 一种如权利要求1所述的用于分布式电源的孤岛保护装置的检测算法，其特征在于：具体过程如下：
    第一步计算时域指标
    Figure PCTCN2018110585-appb-100001
    其中I peak_Bef.是连网状态下的晶闸管电流峰值、I peak_Aft.是孤岛状态下的晶闸管电流峰值；
    第二部计算频域指标ΔTHD＝THD Aft.-THD Bef.，其中THD Bef.是连网状态下的公共连接点电压总谐波含量(THD)值、THD Aft.是孤岛状态下的公共连接点电压THD值；
    孤岛检测判别准则为满足
    Figure PCTCN2018110585-appb-100002
    时，孤岛发生。
  7. 根据权利要求6所述的用于分布式电源的孤岛保护装置的检测算法，其特征在于：晶闸管触发角的在线优化流程具体过程如下：
    初始化定义预设电压损失k、最小触发角δnmin和最大触发角δnmax，然后根据孤岛保护装置跨接于线电压或相电压的不同，基于接入点的短路容量和预设电压损失k计算初始触发角δn；
    对于相电压形式连接：
    Figure PCTCN2018110585-appb-100003
    对于线电压形式连接：
    Figure PCTCN2018110585-appb-100004
    检查初始触发角δn是否在预设范围内，若否则进行限幅；
    检查晶闸管电流应力，并调整触发角；
    计算公共连接点的电压损失百分比，并调整触发角；
    计算公共连接点的电压谐波含量，并调整触发角；
    输出当前电网状态下的实时优化触发角。
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