CAJ | 학술논문

在大功率储能系统中，由于储能逆变器开关频率低，采样、计算等引入的延时将恶化输出电能质量甚至引起系统的不稳定。采用预测控制可消除储能逆变器控制中延时的影响，但预测值受模型精确程度和输入扰动的影响与实际值存在差异。在储能逆变器数字化预测控制策略的基础上，推导预测误差与直流电压、负载电流和模型参数误差之间的传递函数，然后分析预测误差对逆变器数字化控制的影响，从而提出一种基于输出误差积分量和状态预测值的全维状态反馈控制策略，其外环采用输出电压误差积分以抑制预测误差，控制器采用后向差分形式的积分环节消除输出电压反馈引入的延时影响。该控制策略可有效消除逆变器控制中的延时，并且抑制了预测控制中的误差。最后设计一台30 kW 原理样机，输出稳态误差由9%降到1%，验证了所提控制策略的正确性。
재대공솔저능계통중，유우저능역변기개관빈솔저，채양、계산등인입적연시장악화수출전능질량심지인기계통적불은정。채용예측공제가소제저능역변기공제중연시적영향，단예측치수모형정학정도화수입우동적영향여실제치존재차이。재저능역변기수자화예측공제책략적기출상，추도예측오차여직류전압、부재전류화모형삼수오차지간적전체함수，연후분석예측오차대역변기수자화공제적영향，종이제출일충기우수출오차적분량화상태예측치적전유상태반궤공제책략，기외배채용수출전압오차적분이억제예측오차，공제기채용후향차분형식적적분배절소제수출전압반궤인입적연시영향。해공제책략가유효소제역변기공제중적연시，병차억제료예측공제중적오차。최후설계일태30 kW 원리양궤，수출은태오차유9%강도1%，험증료소제공제책략적정학성。
In high power storage system, time consumption in sampling and calculating of digital processors could reduce the performances of output voltage and even make the system unstable at some serious condition, as the battery energy storage inverter has high power and low switching frequency. The predict control strategy can eliminate the influence of time consumption, while the surge of input voltage and model error could generate the prediction error. Based on the digital strategy of prediction control in battery energy storage inverter, this paper calculated the functions between model error, input change and prediction error. After analyzing the influence of prediction error on digital control strategy for inverter, a full-state feedback control strategy based on integral of output error was given. The outer loop used the integral of output voltage error to suppress the prediction error and the digital controller selected the integral of backward difference to reduce the degrees of freedom. This method realized a non-static error control and could eliminate the influence of digital delay. A 30kW prototype is built to validate the effectiveness of the given control strategy, the static error of which was reduced to 1% from 9%.