省级现货市场出清结果对区域同步电网潮流越限的影响

Impact of Provincial Spot Market Clearing Results on the Power Flow Violation of Regional Synchronous Grid

跨省互联大电网可以实现更大范围内的电力资源优化配置,并提高可再生能源消纳能力。在当前“统一市场,两级运作”的全国统一市场体系下,省级市场将以省间市场的跨省交易结果作为边界进行市场出清,然而在区域同步电网内直接将省间的交流联络线功率作为边界节点上的注入功率时省级市场的潮流模型将与实际情况产生偏差,甚至会出现潮流越限的问题。文章首先提出利用由区域调度机构直接调度的直调机组来改善上述潮流越限的问题,然后通过分析省级、省间市场潮流模型的差异,提出将省间联络线功率、边界节点的相角差同时作为省级市场的边界条件,实现了省级市场中对潮流的正确计算,从而避免了潮流越限问题。文章还基于IEEE 39节点验证和分析了以上两种解决方法的有效性和可行性。

Inter-provincial interconnected large power grid can realize the optimal allocation of power resources on a larger scale and improve the consumption capacity of renewable energy.Under the current national unified market system of unified market and two-level operation,the inter-provincial transaction results of the inter-provincial market will be used as the boundary for the provincial market clearing.However,in a regional synchronous grid,if the power of AC inter-provincial tie lines is directly regarded as the injection power of boundary nodes in the provincial market,the power flow model will deviate from the actual power flow,and there will even be a problem of power flow violations.This paper firstly proposes the use of direct-dispatch units,which are directly dispatched by regional dispatch agencies to deal with the above-mentioned problem of power flow violations.Then,by analyzing the differences in the power flow models of the provincial and inter-provincial markets,this paper proposes to use the power of the inter-provincial tie lines and the phase angle differences of the boundary nodes as the boundary conditions of the provincial market at the same time,which realizes the correct calculation of power flow in the provincial market,thereby avoiding the problem of power flow violations.The effectiveness and feasibility of the above two solutions are verified and analyzed based on IEEE 39-bus system.