基于多目标约束的特高压直流配套火电接入系统升压变挡位选择方法及校验  

Step up Transformer Tap Selection Method and Verification of UHVDC Supporting Thermal Power Access System Based on Multi-objective Constraints

作　　者：王新宇 杨朋威 程林 任正 陈肖璐 陈财福 WANG Xin-yu;YANG Peng-wei;CHEGN Lin;REN Zheng;CHEN Xiao-lu;CHEN Cai-fu(State Grid East Inner Mongolia Electric Power Research Institute,Hohhot 010000,China;Northwest Branch of State Grid Corporation of China,Xi'an 710048,China)

机构地区：[1]国网内蒙古东部电力有限公司电力科学研究院,内蒙古呼和浩特010000 [2]国家电网有限公司西北分部,陕西西安710048

出　　处：《变压器》2022年第10期1-6,共6页Transformer

基　　金：内蒙古自治区科技重大专项(2021ZD0039)。

摘　　要：在特高压直流近区电源装机不足的情况下,会形成“强直弱交”的网架结构,火电厂机组并网需最大程度释放其机组进相能力,保障系统无功电压稳定,而升压变挡位选择将直接影响机组无功出力及并网点附近系统电压水平。本文阐述了电源接入对系统的影响,通过分析电厂升压变挡位与无功电压的耦合关系,考虑系统电压、厂用负荷电压及机组进相能力共同约束条件,将升压变挡位选择转化为多元函数不等约束条件极值优化问题,提出了基于Lagrange乘数法的电厂升压变挡位选择方法,并结合西北地区“强直弱交”网架结构,计算分析了直流近区火电机组接入系统升压变的合理挡位,依据工程实际验证了该方法的有效性和实用性。When the installed capacity of UHVDC near area power supply is insufficient, a grid structure of "strong DC and weak AC" will be formed. The generator phase leading capacity of thermal power plant shall be released to the greatest extent to ensure the stability of system reactive power and voltage. The selection of tap of transformer will directly affect the generator reactive power and the system voltage level. This paper expounds the influence of power supply access on the system. By analyzing the coupling relationship between power plant step-up transformer tap and reactive voltage, considering the common constraints of system voltage, auxiliary load voltage and unit phase leading capacity, the tap selection is transformed into the extreme value optimization problem with unequal constraints of multivariate function, and a tap selection method based on Lagrange multiplier method is proposed. Combined with the "strong DC and weak AC" grid structure in Northwest China, the reasonable tap of the step-up transformer connected to the DC near area is calculated and analyzed, and the effectiveness and practicability of the method are verified by engineering practice.

关 键 词：特高压直流 强直弱交 升压变压器 

分 类 号：TM401.1[电气工程—电器]