Jian Geng

Wind Power Dispatch Supporting Technologies and Its Implementation

There are some special characteristics of Chinese wind power, which make its dispatch more challenging. This paper introduces the framework and four key supporting technologies of the proposed wind power dispatch system, which has been put into operation in the Northwest Grid of China. The four key supporting technologies are hybrid real-time/quasi-real-time data communication, wind power closed-loop control, evaluation of wind power integration capability, and wind power operating data analysis based on probability statistic. Performance of the proposed system in the Northwest Grid of China has demonstrated its validity.

Research on the Control Strategy of the Battery Energy Storage System in Wind-Solar-Battery Hybrid Generation Station

Abstract In recent years, wind-solar-battery hybrid generation systems (WSBHGS) with large-scale battery energy system (BESS) have been proposed to integrate into power grids. To smooth the output power and improve the schedulability of the WSBHGS, the BESS control strategy is researched and a distributed control architecture of a two-level hierarchy is proposed, which is consisted of the top-level centralized controller and the local controller. The control strategies of the top-level controller including power correction strategy, power distribution strategy and state of charge (SOC) control strategy for battery are proposed to establish the active power reference of each battery energy storage equipment (BESE) of the BESS. The local controller uses the control of grid-connected converter of BESE to trace the power reference signals rapidly. The fluctuations of the output power of the WSBHGS are tested, and the effectiveness of the proposed BESS control strategy is demonstrated under different power generation schedules from the dispatching center.

New SCED Based on Minimum Bias Objective for Large-Scale Wind Integrated Power Systems

Abstract The necessity of minimum bias control is discussed in this paper, especially for the power system with large-scale wind power integration. Three minimum bias SCED (Security Constrained Economic Dispatch) models: sum-bias, minmax-bias and sum-penalty bias, are presented, and the linear programming algorithm is proposed to solve the optimization problem. Based on actual power system simulation, the proposed models are analyzed and compared. The result shows the efficiency sum-penalty bias model. This model can equably distribute load deviation into available generators even considering the power network constraints. As a result, the proposed sum-penalty bias model has been applied in actual power scheduling in a province power system in China.

Proposal of Block Bidding for Large-Scale Wind Power Energy

Abstract It is necessary for power systems to provide flexible power to balance the fluctuation and intermittency of wind power. For the large-scale and central-integrated wind generation (such as that in China), the required flexible power may be very significant and expensive. In market environment, it is important to design a proper market mechanism and price signal which can promote conventional power and load demand to integrate wind power and gain corresponding profit. Firstly, the paper analyzes the current economy and dispatch policy for wind power in China. Then, a Block Bidding mode for wind power is presented. Unlike Timely Bidding mode that power is auctioned hourly by hourly, for Block Bidding the wind power energy is divided into different energy block. And these blocks are auctioned by conventional power resources and load demands. The Block Bidding mode has some advantages: 1) subdivides wind power by energy quality, and then the value of different parts can be revealed; 2) provides incentive for conventional power resource and load demand to integrate wind power; 3) is convenient for trading and dispatching wind power. Finally, a simple numerical case is given to illustrate the validity of Block Bidding mode.

Effects of Large-Scale Wind Integration on China Northwest Regional Power System and Future Solutions

Abstract The paper introduces the current planning integration situation of the wind power in Northwest Grid of China. The large-scale wind power integration, characterized by concentrated and high voltage level interconnection, makes appreciable effects on power system in stability control, frequency control, load tracking and voltage control. In this situation, the paper studies new requirements of power generation scheduling, dispatch, operation management, power market modelling, grid-connecting operation management, ancillary service management and so on. Finally, the paper introduces the solutions and strategies such as to strengthen the 750 kV grid construction, increase power export of the region, develop a Wind EMS, improve wind power forecasting, explore combined dispatching of wind power and other power plants, and introduce new power market mechanisms.