动力环境综合监控平台的构建与应用

目前，各省市的移动运营商都存在有不同时期、不同地区、不同厂家承建的多套动力及环境监控系统独立并存的情况，文中论述了对已有的监控系统进行有效的整合，形成一个集成了多个厂家、多种组网方式的省级动力综合监控平台（CSC），大大提升网络服务质量。     

省级动环监控中心CSC的实际应用

为实现11个LSC的集中监控,并实现全省电源设备资源的共享,从而提升全省维护管理水平,省级动环监控中心CSC应运而生。全省11个LSC由艾默生、合广、邦讯3家公司承建,受集团B接口规范的制约及被监控的对象数量庞大且无统一规范,初期的CSC无任何实用价值。在对B接口进行了扩展后,CSC能较稳定的取得各LSC的实时告警及监控数据,但对全省电源设备资源的管理、维护管理考核、报表的集中、自动化制作仍无法实现,系统离真正的实用还存在较大差距,本文着重论述对以上问题的应用以及解决方案。     

Fault tolerant control strategy for modular PWM current source inverter

In this paper, a fault-tolerant control method for an input-series output-parallel modular grid-tied pulse-width modulation (PWM) current source inverter is proposed to address the most commonly seen single symmetrical gate-commutated thyristor (SGCT) open-circuit fault problems. This method actively offsets the neutral point of the current space vector to ensure a sinusoidal output of the grid current, and it can achieve the upper limit power of the inverter under the condition of a single SGCT open-circuit fault. In addition, an active damping control method based on grid harmonic current feedback is proposed after analyzing the influence of the transformer ferromagnetic resonance caused by the neutral point offset on the power quality of the grid current. It has been demonstrated that the proposed method effectively suppresses the resonance caused by the transformer and the modified modulation, improving the grid current’s power quality.