CN104485683A - 一种孤岛转联网方法 - Google Patents
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Abstract
本发明公开一种柔性直流输电***孤岛转联网的切换方法,处于孤岛运行下柔性直流输电***,通过检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流现象,以及检测交流侧电压变化情况判断柔性直流输电***是否进入联网状态,控制***从孤岛运行控制方式切换到联网控制方式,切换瞬间通过改变功率指令,以及相位跟踪当前电网电压方式,平稳切换到联网控制方式,保持***持续运行。
Description
技术领域
本发明属于电力电子领域,特别涉及一种柔性直流输电***孤岛转联网的切换方法。
背景技术
柔性直流输电采用电压源型换流器,可以独立、快速控制控制有功功率和无功功率,从而提高***的稳定性,抑制***频率和电压的波动,提高并网交流***的稳态性能。柔性直流输电在新能源并网、分布式发电并网、孤岛供电、城市配网供电等领域具有较大的优势,因此柔性直流输电相关技术的研究具有重要的意义。
柔性直流输电***的处于孤岛运行时,换流站内近端合闸接入交流电网或者远端开关合闸,将柔性直流换流站并联进有源电网运行,需要柔性直流***从当前孤岛运行控制方式转换到联网有源运行控制方式,保持直流输电***继续运行。
当柔性直流输电***处于孤岛运行时,如果由于开关合闸操作,导致柔性直流输电***进入联网状态,需要准确检测柔性直流输电***进入联网时刻,及时从当前孤岛运行转换到有源运行,否则较长时间会导致电网失步,导致柔性直流输电***停运,同时还需要平稳切换至联网方式运行,避免切换瞬间引起过流或者过压现象,导致柔性直流输电***保护动作退出运行。目前柔性直流输电***孤岛运行下检测电网运行方式变化进入联网的检测方式和平滑控制未见相关报道。
发明内容
本发明的目的,在于提供一种柔性直流输电***孤岛运行下检测电网运行方式变化进入联网状态方法,保证柔性直流输电***准确、平滑从孤岛运行转为联网运行。
为了达成上述目的,本发明采用的技术方案是:
控制***通过检测换流器桥臂电流是否出现过流现象以及网侧和阀侧电压变化情况判断柔性直流输电***是否进入联网状态,包括如下步骤:
(1)在柔性直流输电***换流站孤岛运行情况下,检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍。如果出现过流,并持续时间t1,则进入步骤(2),否则返回步骤(1);
(2)闭锁换流器,检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回步骤(1),否则进入步骤(3);
(3)控制***锁相环节设定跟踪当前交流侧电压相位,同时启动控制方式转换,由当前柔性直流输电***换流站孤岛控制转换到有源控制方式,并解锁换流器。
以上步骤(1)中,过流定值取为换流器额定阀侧电流或者换流器桥臂电流的n倍,n取值范围为1~10,持续时间t1取值范围为0~1s,t2取值范围为0~1s;
以上步骤(2)中,交流侧电压的阈值取值范围为0~0.99pu,持续时间t取值范围为0~1s;
以上步骤(3)所述控制方式转换的瞬间,有功功率和无功功率指令可以维持当前有功功率和无功功率的运行值,也可以为0,可通过斜率逐渐升至当前运行值。
本发明还包括一种孤岛转联网控制装置,其特征在于包括换流器检测过流单元,交流侧电压检测单元,以及孤岛转联网模式转换单元。
在柔性直流输电***换流站孤岛运行情况下,上述换流器检测过流单元检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入交流侧电压检测单元,否则返回换流器检测过流单元。
所述交流侧电压检测单元先闭锁换流器,然后检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回换流器检测过流单元继续进行检测,否则进入孤岛转联网模式转换单元。
所述孤岛转联网模式转换单元作用是进行控制方式转换,在控制方式转换的瞬间,有功功率和无功功率指令维持当前有功功率和无功功率的运行值,或者转换后,有功功率和无功功率转换到0,逐渐升到转换前运行值。
本发明还包括一种孤岛转联网控制***,其特征在于,包括换流器、上层控制器以及阀控装置,其中,(1)在柔性直流输电***换流站孤岛运行情况下,上层控制器检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入步骤(2),否则返回步骤(1);
(2)闭锁换流器,检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回步骤(1),否则进入步骤(3);
(3)上层控制器锁相环节设定跟踪当前交流侧电压相位,同时启动控制方式转换,由当前柔性直流输电***换流站孤岛控制转换到有源控制方式,并解锁换流器。
采用上述方案后,本发明的有益效果为:
本发明提供的一种柔性直流输电***孤岛运行下检测电网运行方式变化进入联网状态方法,检测并网时刻准确,可以平滑切换到联网运行方式,不会给电网造成冲击。
附图说明
图1是柔性直流输电***双站结构示意图;
图2是并网检测换流站控制方式示意图;
图3是定直流电压控制站的控制方式示意图;
图4是孤岛运行方式下的柔性直流并网检测流程图。
具体实施方式
以下将结合附图及具体实施例,对本发明的技术方案进行详细说明。
如图1所示,处于孤岛运行的柔性直流输电换流站201-202,远端开关102未合闸,柔性直流输电***201-202没有接入交流电网400,柔性直流输电***201-202处于孤岛运行状态,202为定直流电压控制侧,采用控制方式见图3,201采用图2控制方式,图3为定直流电压控制方式,在切换前后保持不变,图2中并网检测环节检测到联网状态就切换到有功控制方式。如果开关102合闸,按照如下步骤检测(见图4)是否由孤岛转为联网状态运行:
(1)在柔性直流输电***换流站孤岛运行情况下,检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍。如果出现过流,并持续时间t1,则进入步骤(2),否则返回步骤(1);
(2)闭锁换流器,检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回步骤(1),否则进入步骤(3);
(3)控制***锁相环节设定跟踪当前交流侧电压相位,同时启动控制方式转换,由当前柔性直流输电***换流站孤岛控制转换到有源控制方式,并解锁换流器。
以上持续时间t1取值范围为0~1s,t2取值范围为0~1s。
当开关102合上后,如果网侧400为有源状态,则换流器201按照以上步骤从孤岛控制转换到有源控制方式。特殊情况下,网侧400为无源***,开关102合上后,正常情况下不会出现桥臂过流现象,因此控制方式不转换;或者会因闭锁换流器后,检测到交流侧电压低于阈值,立即封锁该联网检测条件一段时间,禁止从孤岛运行转为联网运行,并且同时立即放开换流器触发脉冲,本次检测联网过程结束,换流器201仍然维持原孤岛运行状态。
本发明还提供一种孤岛转联网控制装置,包括换流器检测过流单元,交流侧电压检测单元,以及孤岛转联网模式转换单元;在柔性直流输电***换流站孤岛运行情况下,所述换流器检测过流单元检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入交流侧电压检测单元,否则返回换流器检测过流单元;
所述交流侧电压检测单元先闭锁换流器,然后检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回换流器检测过流单元继续进行检测,否则进入孤岛转联网模式转换单元;
所述孤岛转联网模式转换单元作用是进行控制方式转换,在控制方式转换的瞬间,有功功率和无功功率指令维持当前有功功率和无功功率的运行值,或者转换后,有功功率和无功功率转换到0,逐渐升到转换前运行值。
本发明还提供一种孤岛转联网控制***,包括换流器、上层控制器以及阀控装置,其中,(1)在柔性直流输电***换流站孤岛运行情况下,上层控制器检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入步骤(2),否则返回步骤(1);
(2)闭锁换流器,检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回步骤(1),否则进入步骤(3);
(3)上层控制器锁相环节设定跟踪当前交流侧电压相位,同时启动控制方式转换,由当前柔性直流输电***换流站孤岛控制转换到有源控制方式,并解锁换流器。
以上实施例仅为说明本发明的技术思想,不能以此限定本发明的保护范围,凡是按照本发明提出的技术思想,在技术方案基础上所做的任何改动,均落入本发明保护范围之内。
Claims (6)
1.一种柔性直流输电***孤岛转联网的切换方法,其特征在于,包括如下步骤:
(1)在柔性直流输电***换流站孤岛运行情况下,检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入步骤(2),否则返回步骤(1);
(2)闭锁换流器,检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回步骤(1),否则进入步骤(3);
(3)控制***锁相环节设定跟踪当前交流侧电压相位,同时启动控制方式转换,由当前柔性直流输电***换流站孤岛控制转换到有源控制方式,并解锁换流器。
2.如权利要求1所述的一种柔性直流输电***孤岛转联网的切换方法,其特征在于,所述步骤(1)中,过流定值取为换流器额定阀侧电流或者换流器桥臂电流的n倍,n取值范围为1~10,持续时间t1取值范围为0~1s,t2取值范围为0~1s。
3.如权利要求1所述柔性直流输电***孤岛转联网的方法,所述步骤(2)中,交流侧电压的阀值取值范围为0~0.99pu,持续时间t取值范围为0~1s。
4.如权利要求1所述柔性直流输电***孤岛转联网的方法,步骤(3)所述控制方式转换的瞬间,有功功率和无功功率指令维持当前有功功率和无功功率的运行值,或者转换后,有功功率和无功功率转换到0,逐渐升到转换前运行值。
5.一种孤岛转联网控制装置,其特征在于包括换流器检测过流单元,交流侧电压检测单元,以及孤岛转联网模式转换单元;在柔性直流输电***换流站孤岛运行情况下,所述换流器检测过流单元检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入交流侧电压检测单元,否则返回换流器检测过流单元;
所述交流侧电压检测单元先闭锁换流器,然后检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回换流器检测过流单元继续进行检测,否则进入孤岛转联网模式转换单元;
所述孤岛转联网模式转换单元作用是进行控制方式转换,在控制方式转换的瞬间,有功功率和无功功率指令维持当前有功功率和无功功率的运行值,或者转换后,有功功率和无功功率转换到0,逐渐升到转换前运行值。
6.一种孤岛转联网控制***,其特征在于,包括换流器、上层控制器以及阀控装置,其中,(1)在柔性直流输电***换流站孤岛运行情况下,上层控制器检测换流器阀侧三相交流电流或换流器桥臂电流是否出现过流情况,过流定值取为额定桥臂电流的n倍;如果出现过流,并持续时间t1,则进入步骤(2),否则返回步骤(1);
(2)闭锁换流器,检测交流侧电压是否低于阈值,如果低于阈值,且持续时间t2,则解锁换流器,返回步骤(1),否则进入步骤(3);
(3)上层控制器锁相环节设定跟踪当前交流侧电压相位,同时启动控制方式转换,由当前柔性直流输电***换流站孤岛控制转换到有源控制方式,并解锁换流器。
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