Solving method for node marginal electricity price
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A marginal and nodal technology, applied in the field of electricity market pricing/clearing, can solve problems such as inapplicability and inability to obtain node marginal electricity prices for purely rigid load nodes
Active Publication Date: 2018-01-09
CHINA ELECTRIC POWER RES INST +2
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During the transition period of my country's electricity market, only some loads may participate in quotations, and the rest may still participate in the market as rigid loads. Only demand is reported, and prices are not quoted. Considering that most nodes are pure rigid load nodes, the traditional rigid load is substituted into the model as a fixed value The processing method will make it impossible to obtain the node marginal price of pure rigid load nodes, and the traditional processing method will not be suitable for the derivation of the node marginal price model in the market environment
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Embodiment 1
[0176] The network topology structure diagram of embodiment 1 provided by the present invention is as follows image 3 As shown, it contains: 4 generators, 3 loads, and no pure load nodes. The generator quotation parameters are shown in Table 1, and the load quotation parameters are shown in Table 2:
[0177] Table 1 Generator Quotation Parameters
[0178] dynamo
Capacity (MW)
Marginal cost ($ / MWh)
A
140
7.5
B
285
6
C
90
14
D
85
10
[0179] Table 2 Load Quotation Parameters
[0180]
[0181] Select the reference parameter S B =100MVA,V B =115KV. Line parameters are shown in Table 3:
[0182] Table 3 line unit parameters
[0183] branch road
Admittance parameter (p.u.)
Capacity (MW)
1-2
3.12-j2.94
80
1-3
2.68-j5.32
220
2-3
2.81-j4.49
130
[0184] (1) Choose node 3 as the reference point, then
[0185] Node conductance matrix:
[0186] Ne...
Embodiment 2
[0223] The network topology structure diagram of embodiment 2 provided by the present invention is as follows Figure 4 As shown, it contains: 3 generators, 3 loads, and node 2 is a pure load node. The generator quotation parameters are shown in Table 5, and the load quotation parameters are shown in Table 6:
[0224] Table 5 Generator Quotation Parameters
[0225] dynamo
Capacity (MW)
Marginal cost ($ / MWh)
A
140
7.5
B
200
6
C
85
10
[0226] Table 6 Load Quotation Parameters
[0227] load
Minimum power (MW)
Maximum power (MW)
Marginal cost ($ / MWh)
L1
0
0.5
14
L2
1
1
——
L3
0
2
15
[0228] Line parameters are the same as Table 3 of Embodiment 1.
[0229] (1) Economic dispatch model
[0230] min 7.5*P A +6*P B +10*P C -14*L 1 -0*L 2 -15*L 3
[0231] S.T.P A +P B +P C -L 1 -L 2 -L 3 -P L =0
[0232] 0.2504 (P A +P B -L 1 )-0.2966(0...
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Abstract
The invention relates to a solving method for node marginal electricity price, and the method is based on the B coefficient transmission loss correction of a DC method and gives consideration to load-side quoted price. The method comprises the steps: a DC method B coefficient and a power transfer factor SF; building an economic dispatching model comprising an optimization target, unit constraints,and load flow constraints; deducing a node marginal electricity price model, and determining the node marginal electricity price; determining transmission loss micro-increasing rates of a generator node and a load node; determining a marginal node and a full-load circuit; determining an unknown full-load circuit shadow price Mu and system electric energy price lambda; and determining the node marginal electricity price of a non-marginal node. According to the technical scheme of the invention, the method is high in applicability, can be used for solving the node marginal electricity prices ofthe generator node, a quoted sensitive pure load node and a non-quoted rigid pure load node, and is suitable for market pricing at each stage of electricity market construction. The detailed solvingmethod provides references for the development of the solving software of the node marginal electricity price.
Description
technical field [0001] The invention relates to a method for solving a marginal electricity price in the technical field of electric power market pricing / clearing, in particular to a method for solving a node marginal electricity price. Background technique [0002] The node marginal electricity price is the minimum power purchase fee required to increase a unit of active power at a node while ensuring the safe operation of the power system under the current system operating state. Measuring the price of buying and selling electricity, measuring the cost of congestion and network loss, is a by-product of economic dispatch, to ensure the minimum cost of power purchase in the whole system, and to measure the scarcity of system resources. Network loss is difficult to simulate. Currently, a rough proportional allocation of network loss is commonly used. There are two difficulties in solving the node electricity price: first, the choice of reference point affects the electricity...
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