Network loss allocation method for bilateral transactions based on network splitting method

Abstract

The present invention discloses a bilateral trade transmission loss allocation method based on a network splitting method, belonging to the network equivalence conversion technology field. The method comprises the following steps: 1) obtaining accurate transmission loss of each branch and the total transmission loss of the network according to an alternating current power flow calculation method; 2) determining the reserved branches of the converted network according to the network topology structure and the bilateral trade; 3) calculating and obtaining the power flow distribution of each group of the bilateral trade in each branch of the network according to the reserved branches; and 4) performing transmission loss allocation according to the proportion of the branch current flow caused by a single transaction in the total branch current flow caused by all the transactions. The bilateral trade transmission loss allocation method based on a network splitting method is configured to apply the network splitting method firstly to the transmission loss allocation and build a allocation cost model based on each transaction and perform solution so as to accurately reflect the power and the transmission distance of each transaction, solve the problem of the parallel flow and the counter-current flow in the cross-district transaction transmission loss allocation, and allow the transmission loss to be reasonably allocated to each transaction.

Description

technical field [0001] The invention belongs to the technical field of network equivalent conversion, in particular to a method for allocating network losses of bilateral transactions based on a network splitting method. Background technique [0002] The active power loss of the transmission system generally only accounts for a small part of the total power transaction, about 3%-5%, but the cumulative effect cannot be ignored, and may have a great impact on different transactions and grid users. The purpose of network loss allocation in the power system environment is to allocate the corresponding network transmission loss and cost to each transaction participating in the market. With the formation of my country's cross-regional interconnected power grid and the gradual opening of the power market, a large number of power exchanges between provincial and even regional power grids will increase, and the components of cross-regional transactions will become more complex. Bila...

AI Technical Summary

Problems solved by technology

Both the contract path method and the MW-Mile method are embedded cost methods. The basic idea is to obtain the average cost based on the total cost of the transmission network to provide transmission services, and then allocate it to the contract or each member; the shortcoming is that it does not reflect the actual operation It is difficult to provide economic guidance and reflect the different impacts of each transaction on the network

The network loss incremental method is a sensitivity analysis method, which belongs to the marginal cost method, that is, the network loss is allocated to each transaction according to the change in the entire network loss caused by the unit change of the transaction; however, the system operation mode and transaction order are different. It will have a great impact on the apportionment results, and multiple power flow calculations and loss calculations are required, and the implementation process is more complicated

The kernel theory apportionment method regards network loss allocation as a cooperative game problem. First, the network loss generated when each transaction acts independently is directly allocated to each transaction, and then the cross network loss caused by the interaction of each transaction is allocated. The method is not affected by the additional order of each transaction, and the allocation result is accurate, but it also needs to calculate the network loss for different transaction combinations. In the actual multilateral transaction mode, the complexity increases with the increase in the number of transactions, and the operability is not good. powerful

Images