Dispatching method and device for integrated transmission and distribution network

A dispatching device for an integrated transmission and distribution network, wherein the integrated transmission and distribution network comprises a transmission network and at least one distribution network, and the device comprises:

• a processor;
• and
• a memory, configured to store instructions executable by the processor,
• wherein the processor is configured to:
• establish a dispatch model of the integrated transmission and distribution network, wherein the dispatch model comprises an objective function and constraints, the objective function is a minimizing function of a total generation cost of the transmission network and the at least one distribution network under the constraints, wherein the total generation cost of the transmission network and the at least one distribution network is established by a formula of:
• ∑
• t
• ∈
• T
• ⁢
• ∑
• i
• ∈
• G
• trans
• ⁢
• C
• i
• trans
• ⁡
• (
• pg
• i
• ,
• t
• trans
• )
• +
• ∑
• t
• ∈
• T
• ⁢
• ⁢
• ∑
• k
• ∈
• DIST
• ⁢
• ∑
• i
• ∈
• G
• dist
• ,
• k
• ⁢
• C
• i
• dist
• ,
• k
• ⁡
• (
• pg
• i
• ,
• t
• dist
• ,
• k
• )
• ,
• (
• 1
• )
• where, T is an index set of dispatch periods, Gtrans is an index set of generator bus numbers in the transmission network, DIST is an index set of the at least one distribution network, Gdist,k is an index set of generator bus numbers in a distribution network k, Citrans(pgi,ttrans) is a cost function of a generator at a bus i of the transmission network during a dispatch period t, pgi,ttrans is an active power output of the generator at the bus i of the transmission network during the dispatch period t, Cidist,k(pgi,tdist,k) is a cost function of a generator at a bus i of the distribution network k during the dispatch period t, pgi,tdist,k is an active power output of the generator at the bus i of the distribution network k during the dispatch period t;
• solve the dispatch model to obtain dynamic dispatch parameters for the integrated transmission and distribution network, wherein the dynamic dispatch parameters comprise a boundary transferred power from the transmission network to each of the at least one distribution network, and power outputs of all generators in the transmission network and each of the at least one distribution network;
• and
• dispatch the integrated transmission and distribution network based on the boundary transferred power and the power outputs of all the generators in the transmission network and each of the at least one distribution network,
• wherein Citrans(pgi,ttrans) is expressed as:
• Citrans(pgi,ttrans)=a0,itrans+a1,itranspgi,ttrans+a2,itrans(pgi,ttrans)2 (2),
• where, a0,itrans is a constant coefficient of generation cost of the generator at the bus i of the transmission network, a1,itrans is a linear coefficient of generation cost of the generator at the bus i of the transmission network, and a2,itrans is a quadratic coefficient of generation cost of the generator at the bus i of the transmission network.

A non-transitory computer-readable storage medium having stored therein instructions that, when executed by a processor of a computer, causes the computer to perform a dispatching method for an integrated transmission and distribution network, wherein the integrated transmission and distribution network comprises a transmission network and at least one distribution network, the method comprises:

• establishing a dispatch model of the integrated transmission and distribution network, wherein the dispatch model comprises an objective function and constraints, the objective function is a minimizing function of a total generation cost of the transmission network and the at least one distribution network under the constraints, wherein the total generation cost of the transmission network and the at least one distribution network is established by a formula of:
• ∑
• t
• ∈
• T
• ⁢
• ∑
• i
• ∈
• G
• trans
• ⁢
• C
• i
• trans
• ⁡
• (
• pg
• i
• ,
• t
• trans
• )
• +
• ∑
• t
• ∈
• T
• ⁢
• ⁢
• ∑
• k
• ∈
• DIST
• ⁢
• ∑
• i
• ∈
• G
• dist
• ,
• k
• ⁢
• C
• i
• dist
• ,
• k
• ⁡
• (
• pg
• i
• ,
• t
• dist
• ,
• k
• )
• ,
• (
• 1
• )
• where, T is an index set of dispatch periods, Gtrans is an index set of generator bus numbers in the transmission network, DIST is an index set of the at least one distribution network, Gdist,k is an index set of generator bus numbers in a distribution network k, Citrans(pgi,ttrans) is a cost function of a generator at a bus i of the transmission network during a dispatch period t, pgi,ttrans is an active power output of the generator at the bus i of the transmission network during the dispatch period t, Cidist,k(pgi,tdist,k) is a cost function of a generator at a bus i of the distribution network k during the dispatch period t, pgi,tdist,k is an active power output of the generator at the bus i of the distribution network k during the dispatch period t;
• solving the dispatch model to obtain dynamic dispatch parameters for the integrated transmission and distribution network, wherein the dynamic dispatch parameters comprise a boundary transferred power from the transmission network to each of the at least one distribution network, and power outputs of all generators in the transmission network and each of the at least one distribution network;
• and
• dispatching the integrated transmission and distribution network based on the boundary transferred power and the power outputs of all the generators in the transmission network and each of the at least one distribution network, wherein Citrans(pgi,ttrans) is expressed as:
• Citrans(pgi,ttrans)=a0,itrans+a1,itranspgi,ttrans+a2,itrans(pgi,ttrans)2 (2),
• where, a0,itrans is a constant coefficient of generation cost of the generator at the bus i of the transmission network, a1,itrans is a linear coefficient of generation cost of the generator at the bus i of the transmission network, and a2,itrans is a quadratic coefficient of generation cost of the generator at the bus i of the transmission network.